sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, 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/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <machine/in_cksum.h>
  55
  56
  57
  58 #define SCTP_MAX_GAPS_INARRAY 4
  59 struct sack_track {
  60         uint8_t right_edge;     /* mergable on the right edge */
  61         uint8_t left_edge;      /* mergable on the left edge */
  62         uint8_t num_entries;
  63         uint8_t spare;
  64         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  65 };
  66
  67 struct sack_track sack_array[256] = {
  68         {0, 0, 0, 0,            /* 0x00 */
  69                 {{0, 0},
  70                 {0, 0},
  71                 {0, 0},
  72                 {0, 0}
  73                 }
  74         },
  75         {1, 0, 1, 0,            /* 0x01 */
  76                 {{0, 0},
  77                 {0, 0},
  78                 {0, 0},
  79                 {0, 0}
  80                 }
  81         },
  82         {0, 0, 1, 0,            /* 0x02 */
  83                 {{1, 1},
  84                 {0, 0},
  85                 {0, 0},
  86                 {0, 0}
  87                 }
  88         },
  89         {1, 0, 1, 0,            /* 0x03 */
  90                 {{0, 1},
  91                 {0, 0},
  92                 {0, 0},
  93                 {0, 0}
  94                 }
  95         },
  96         {0, 0, 1, 0,            /* 0x04 */
  97                 {{2, 2},
  98                 {0, 0},
  99                 {0, 0},
 100                 {0, 0}
 101                 }
 102         },
 103         {1, 0, 2, 0,            /* 0x05 */
 104                 {{0, 0},
 105                 {2, 2},
 106                 {0, 0},
 107                 {0, 0}
 108                 }
 109         },
 110         {0, 0, 1, 0,            /* 0x06 */
 111                 {{1, 2},
 112                 {0, 0},
 113                 {0, 0},
 114                 {0, 0}
 115                 }
 116         },
 117         {1, 0, 1, 0,            /* 0x07 */
 118                 {{0, 2},
 119                 {0, 0},
 120                 {0, 0},
 121                 {0, 0}
 122                 }
 123         },
 124         {0, 0, 1, 0,            /* 0x08 */
 125                 {{3, 3},
 126                 {0, 0},
 127                 {0, 0},
 128                 {0, 0}
 129                 }
 130         },
 131         {1, 0, 2, 0,            /* 0x09 */
 132                 {{0, 0},
 133                 {3, 3},
 134                 {0, 0},
 135                 {0, 0}
 136                 }
 137         },
 138         {0, 0, 2, 0,            /* 0x0a */
 139                 {{1, 1},
 140                 {3, 3},
 141                 {0, 0},
 142                 {0, 0}
 143                 }
 144         },
 145         {1, 0, 2, 0,            /* 0x0b */
 146                 {{0, 1},
 147                 {3, 3},
 148                 {0, 0},
 149                 {0, 0}
 150                 }
 151         },
 152         {0, 0, 1, 0,            /* 0x0c */
 153                 {{2, 3},
 154                 {0, 0},
 155                 {0, 0},
 156                 {0, 0}
 157                 }
 158         },
 159         {1, 0, 2, 0,            /* 0x0d */
 160                 {{0, 0},
 161                 {2, 3},
 162                 {0, 0},
 163                 {0, 0}
 164                 }
 165         },
 166         {0, 0, 1, 0,            /* 0x0e */
 167                 {{1, 3},
 168                 {0, 0},
 169                 {0, 0},
 170                 {0, 0}
 171                 }
 172         },
 173         {1, 0, 1, 0,            /* 0x0f */
 174                 {{0, 3},
 175                 {0, 0},
 176                 {0, 0},
 177                 {0, 0}
 178                 }
 179         },
 180         {0, 0, 1, 0,            /* 0x10 */
 181                 {{4, 4},
 182                 {0, 0},
 183                 {0, 0},
 184                 {0, 0}
 185                 }
 186         },
 187         {1, 0, 2, 0,            /* 0x11 */
 188                 {{0, 0},
 189                 {4, 4},
 190                 {0, 0},
 191                 {0, 0}
 192                 }
 193         },
 194         {0, 0, 2, 0,            /* 0x12 */
 195                 {{1, 1},
 196                 {4, 4},
 197                 {0, 0},
 198                 {0, 0}
 199                 }
 200         },
 201         {1, 0, 2, 0,            /* 0x13 */
 202                 {{0, 1},
 203                 {4, 4},
 204                 {0, 0},
 205                 {0, 0}
 206                 }
 207         },
 208         {0, 0, 2, 0,            /* 0x14 */
 209                 {{2, 2},
 210                 {4, 4},
 211                 {0, 0},
 212                 {0, 0}
 213                 }
 214         },
 215         {1, 0, 3, 0,            /* 0x15 */
 216                 {{0, 0},
 217                 {2, 2},
 218                 {4, 4},
 219                 {0, 0}
 220                 }
 221         },
 222         {0, 0, 2, 0,            /* 0x16 */
 223                 {{1, 2},
 224                 {4, 4},
 225                 {0, 0},
 226                 {0, 0}
 227                 }
 228         },
 229         {1, 0, 2, 0,            /* 0x17 */
 230                 {{0, 2},
 231                 {4, 4},
 232                 {0, 0},
 233                 {0, 0}
 234                 }
 235         },
 236         {0, 0, 1, 0,            /* 0x18 */
 237                 {{3, 4},
 238                 {0, 0},
 239                 {0, 0},
 240                 {0, 0}
 241                 }
 242         },
 243         {1, 0, 2, 0,            /* 0x19 */
 244                 {{0, 0},
 245                 {3, 4},
 246                 {0, 0},
 247                 {0, 0}
 248                 }
 249         },
 250         {0, 0, 2, 0,            /* 0x1a */
 251                 {{1, 1},
 252                 {3, 4},
 253                 {0, 0},
 254                 {0, 0}
 255                 }
 256         },
 257         {1, 0, 2, 0,            /* 0x1b */
 258                 {{0, 1},
 259                 {3, 4},
 260                 {0, 0},
 261                 {0, 0}
 262                 }
 263         },
 264         {0, 0, 1, 0,            /* 0x1c */
 265                 {{2, 4},
 266                 {0, 0},
 267                 {0, 0},
 268                 {0, 0}
 269                 }
 270         },
 271         {1, 0, 2, 0,            /* 0x1d */
 272                 {{0, 0},
 273                 {2, 4},
 274                 {0, 0},
 275                 {0, 0}
 276                 }
 277         },
 278         {0, 0, 1, 0,            /* 0x1e */
 279                 {{1, 4},
 280                 {0, 0},
 281                 {0, 0},
 282                 {0, 0}
 283                 }
 284         },
 285         {1, 0, 1, 0,            /* 0x1f */
 286                 {{0, 4},
 287                 {0, 0},
 288                 {0, 0},
 289                 {0, 0}
 290                 }
 291         },
 292         {0, 0, 1, 0,            /* 0x20 */
 293                 {{5, 5},
 294                 {0, 0},
 295                 {0, 0},
 296                 {0, 0}
 297                 }
 298         },
 299         {1, 0, 2, 0,            /* 0x21 */
 300                 {{0, 0},
 301                 {5, 5},
 302                 {0, 0},
 303                 {0, 0}
 304                 }
 305         },
 306         {0, 0, 2, 0,            /* 0x22 */
 307                 {{1, 1},
 308                 {5, 5},
 309                 {0, 0},
 310                 {0, 0}
 311                 }
 312         },
 313         {1, 0, 2, 0,            /* 0x23 */
 314                 {{0, 1},
 315                 {5, 5},
 316                 {0, 0},
 317                 {0, 0}
 318                 }
 319         },
 320         {0, 0, 2, 0,            /* 0x24 */
 321                 {{2, 2},
 322                 {5, 5},
 323                 {0, 0},
 324                 {0, 0}
 325                 }
 326         },
 327         {1, 0, 3, 0,            /* 0x25 */
 328                 {{0, 0},
 329                 {2, 2},
 330                 {5, 5},
 331                 {0, 0}
 332                 }
 333         },
 334         {0, 0, 2, 0,            /* 0x26 */
 335                 {{1, 2},
 336                 {5, 5},
 337                 {0, 0},
 338                 {0, 0}
 339                 }
 340         },
 341         {1, 0, 2, 0,            /* 0x27 */
 342                 {{0, 2},
 343                 {5, 5},
 344                 {0, 0},
 345                 {0, 0}
 346                 }
 347         },
 348         {0, 0, 2, 0,            /* 0x28 */
 349                 {{3, 3},
 350                 {5, 5},
 351                 {0, 0},
 352                 {0, 0}
 353                 }
 354         },
 355         {1, 0, 3, 0,            /* 0x29 */
 356                 {{0, 0},
 357                 {3, 3},
 358                 {5, 5},
 359                 {0, 0}
 360                 }
 361         },
 362         {0, 0, 3, 0,            /* 0x2a */
 363                 {{1, 1},
 364                 {3, 3},
 365                 {5, 5},
 366                 {0, 0}
 367                 }
 368         },
 369         {1, 0, 3, 0,            /* 0x2b */
 370                 {{0, 1},
 371                 {3, 3},
 372                 {5, 5},
 373                 {0, 0}
 374                 }
 375         },
 376         {0, 0, 2, 0,            /* 0x2c */
 377                 {{2, 3},
 378                 {5, 5},
 379                 {0, 0},
 380                 {0, 0}
 381                 }
 382         },
 383         {1, 0, 3, 0,            /* 0x2d */
 384                 {{0, 0},
 385                 {2, 3},
 386                 {5, 5},
 387                 {0, 0}
 388                 }
 389         },
 390         {0, 0, 2, 0,            /* 0x2e */
 391                 {{1, 3},
 392                 {5, 5},
 393                 {0, 0},
 394                 {0, 0}
 395                 }
 396         },
 397         {1, 0, 2, 0,            /* 0x2f */
 398                 {{0, 3},
 399                 {5, 5},
 400                 {0, 0},
 401                 {0, 0}
 402                 }
 403         },
 404         {0, 0, 1, 0,            /* 0x30 */
 405                 {{4, 5},
 406                 {0, 0},
 407                 {0, 0},
 408                 {0, 0}
 409                 }
 410         },
 411         {1, 0, 2, 0,            /* 0x31 */
 412                 {{0, 0},
 413                 {4, 5},
 414                 {0, 0},
 415                 {0, 0}
 416                 }
 417         },
 418         {0, 0, 2, 0,            /* 0x32 */
 419                 {{1, 1},
 420                 {4, 5},
 421                 {0, 0},
 422                 {0, 0}
 423                 }
 424         },
 425         {1, 0, 2, 0,            /* 0x33 */
 426                 {{0, 1},
 427                 {4, 5},
 428                 {0, 0},
 429                 {0, 0}
 430                 }
 431         },
 432         {0, 0, 2, 0,            /* 0x34 */
 433                 {{2, 2},
 434                 {4, 5},
 435                 {0, 0},
 436                 {0, 0}
 437                 }
 438         },
 439         {1, 0, 3, 0,            /* 0x35 */
 440                 {{0, 0},
 441                 {2, 2},
 442                 {4, 5},
 443                 {0, 0}
 444                 }
 445         },
 446         {0, 0, 2, 0,            /* 0x36 */
 447                 {{1, 2},
 448                 {4, 5},
 449                 {0, 0},
 450                 {0, 0}
 451                 }
 452         },
 453         {1, 0, 2, 0,            /* 0x37 */
 454                 {{0, 2},
 455                 {4, 5},
 456                 {0, 0},
 457                 {0, 0}
 458                 }
 459         },
 460         {0, 0, 1, 0,            /* 0x38 */
 461                 {{3, 5},
 462                 {0, 0},
 463                 {0, 0},
 464                 {0, 0}
 465                 }
 466         },
 467         {1, 0, 2, 0,            /* 0x39 */
 468                 {{0, 0},
 469                 {3, 5},
 470                 {0, 0},
 471                 {0, 0}
 472                 }
 473         },
 474         {0, 0, 2, 0,            /* 0x3a */
 475                 {{1, 1},
 476                 {3, 5},
 477                 {0, 0},
 478                 {0, 0}
 479                 }
 480         },
 481         {1, 0, 2, 0,            /* 0x3b */
 482                 {{0, 1},
 483                 {3, 5},
 484                 {0, 0},
 485                 {0, 0}
 486                 }
 487         },
 488         {0, 0, 1, 0,            /* 0x3c */
 489                 {{2, 5},
 490                 {0, 0},
 491                 {0, 0},
 492                 {0, 0}
 493                 }
 494         },
 495         {1, 0, 2, 0,            /* 0x3d */
 496                 {{0, 0},
 497                 {2, 5},
 498                 {0, 0},
 499                 {0, 0}
 500                 }
 501         },
 502         {0, 0, 1, 0,            /* 0x3e */
 503                 {{1, 5},
 504                 {0, 0},
 505                 {0, 0},
 506                 {0, 0}
 507                 }
 508         },
 509         {1, 0, 1, 0,            /* 0x3f */
 510                 {{0, 5},
 511                 {0, 0},
 512                 {0, 0},
 513                 {0, 0}
 514                 }
 515         },
 516         {0, 0, 1, 0,            /* 0x40 */
 517                 {{6, 6},
 518                 {0, 0},
 519                 {0, 0},
 520                 {0, 0}
 521                 }
 522         },
 523         {1, 0, 2, 0,            /* 0x41 */
 524                 {{0, 0},
 525                 {6, 6},
 526                 {0, 0},
 527                 {0, 0}
 528                 }
 529         },
 530         {0, 0, 2, 0,            /* 0x42 */
 531                 {{1, 1},
 532                 {6, 6},
 533                 {0, 0},
 534                 {0, 0}
 535                 }
 536         },
 537         {1, 0, 2, 0,            /* 0x43 */
 538                 {{0, 1},
 539                 {6, 6},
 540                 {0, 0},
 541                 {0, 0}
 542                 }
 543         },
 544         {0, 0, 2, 0,            /* 0x44 */
 545                 {{2, 2},
 546                 {6, 6},
 547                 {0, 0},
 548                 {0, 0}
 549                 }
 550         },
 551         {1, 0, 3, 0,            /* 0x45 */
 552                 {{0, 0},
 553                 {2, 2},
 554                 {6, 6},
 555                 {0, 0}
 556                 }
 557         },
 558         {0, 0, 2, 0,            /* 0x46 */
 559                 {{1, 2},
 560                 {6, 6},
 561                 {0, 0},
 562                 {0, 0}
 563                 }
 564         },
 565         {1, 0, 2, 0,            /* 0x47 */
 566                 {{0, 2},
 567                 {6, 6},
 568                 {0, 0},
 569                 {0, 0}
 570                 }
 571         },
 572         {0, 0, 2, 0,            /* 0x48 */
 573                 {{3, 3},
 574                 {6, 6},
 575                 {0, 0},
 576                 {0, 0}
 577                 }
 578         },
 579         {1, 0, 3, 0,            /* 0x49 */
 580                 {{0, 0},
 581                 {3, 3},
 582                 {6, 6},
 583                 {0, 0}
 584                 }
 585         },
 586         {0, 0, 3, 0,            /* 0x4a */
 587                 {{1, 1},
 588                 {3, 3},
 589                 {6, 6},
 590                 {0, 0}
 591                 }
 592         },
 593         {1, 0, 3, 0,            /* 0x4b */
 594                 {{0, 1},
 595                 {3, 3},
 596                 {6, 6},
 597                 {0, 0}
 598                 }
 599         },
 600         {0, 0, 2, 0,            /* 0x4c */
 601                 {{2, 3},
 602                 {6, 6},
 603                 {0, 0},
 604                 {0, 0}
 605                 }
 606         },
 607         {1, 0, 3, 0,            /* 0x4d */
 608                 {{0, 0},
 609                 {2, 3},
 610                 {6, 6},
 611                 {0, 0}
 612                 }
 613         },
 614         {0, 0, 2, 0,            /* 0x4e */
 615                 {{1, 3},
 616                 {6, 6},
 617                 {0, 0},
 618                 {0, 0}
 619                 }
 620         },
 621         {1, 0, 2, 0,            /* 0x4f */
 622                 {{0, 3},
 623                 {6, 6},
 624                 {0, 0},
 625                 {0, 0}
 626                 }
 627         },
 628         {0, 0, 2, 0,            /* 0x50 */
 629                 {{4, 4},
 630                 {6, 6},
 631                 {0, 0},
 632                 {0, 0}
 633                 }
 634         },
 635         {1, 0, 3, 0,            /* 0x51 */
 636                 {{0, 0},
 637                 {4, 4},
 638                 {6, 6},
 639                 {0, 0}
 640                 }
 641         },
 642         {0, 0, 3, 0,            /* 0x52 */
 643                 {{1, 1},
 644                 {4, 4},
 645                 {6, 6},
 646                 {0, 0}
 647                 }
 648         },
 649         {1, 0, 3, 0,            /* 0x53 */
 650                 {{0, 1},
 651                 {4, 4},
 652                 {6, 6},
 653                 {0, 0}
 654                 }
 655         },
 656         {0, 0, 3, 0,            /* 0x54 */
 657                 {{2, 2},
 658                 {4, 4},
 659                 {6, 6},
 660                 {0, 0}
 661                 }
 662         },
 663         {1, 0, 4, 0,            /* 0x55 */
 664                 {{0, 0},
 665                 {2, 2},
 666                 {4, 4},
 667                 {6, 6}
 668                 }
 669         },
 670         {0, 0, 3, 0,            /* 0x56 */
 671                 {{1, 2},
 672                 {4, 4},
 673                 {6, 6},
 674                 {0, 0}
 675                 }
 676         },
 677         {1, 0, 3, 0,            /* 0x57 */
 678                 {{0, 2},
 679                 {4, 4},
 680                 {6, 6},
 681                 {0, 0}
 682                 }
 683         },
 684         {0, 0, 2, 0,            /* 0x58 */
 685                 {{3, 4},
 686                 {6, 6},
 687                 {0, 0},
 688                 {0, 0}
 689                 }
 690         },
 691         {1, 0, 3, 0,            /* 0x59 */
 692                 {{0, 0},
 693                 {3, 4},
 694                 {6, 6},
 695                 {0, 0}
 696                 }
 697         },
 698         {0, 0, 3, 0,            /* 0x5a */
 699                 {{1, 1},
 700                 {3, 4},
 701                 {6, 6},
 702                 {0, 0}
 703                 }
 704         },
 705         {1, 0, 3, 0,            /* 0x5b */
 706                 {{0, 1},
 707                 {3, 4},
 708                 {6, 6},
 709                 {0, 0}
 710                 }
 711         },
 712         {0, 0, 2, 0,            /* 0x5c */
 713                 {{2, 4},
 714                 {6, 6},
 715                 {0, 0},
 716                 {0, 0}
 717                 }
 718         },
 719         {1, 0, 3, 0,            /* 0x5d */
 720                 {{0, 0},
 721                 {2, 4},
 722                 {6, 6},
 723                 {0, 0}
 724                 }
 725         },
 726         {0, 0, 2, 0,            /* 0x5e */
 727                 {{1, 4},
 728                 {6, 6},
 729                 {0, 0},
 730                 {0, 0}
 731                 }
 732         },
 733         {1, 0, 2, 0,            /* 0x5f */
 734                 {{0, 4},
 735                 {6, 6},
 736                 {0, 0},
 737                 {0, 0}
 738                 }
 739         },
 740         {0, 0, 1, 0,            /* 0x60 */
 741                 {{5, 6},
 742                 {0, 0},
 743                 {0, 0},
 744                 {0, 0}
 745                 }
 746         },
 747         {1, 0, 2, 0,            /* 0x61 */
 748                 {{0, 0},
 749                 {5, 6},
 750                 {0, 0},
 751                 {0, 0}
 752                 }
 753         },
 754         {0, 0, 2, 0,            /* 0x62 */
 755                 {{1, 1},
 756                 {5, 6},
 757                 {0, 0},
 758                 {0, 0}
 759                 }
 760         },
 761         {1, 0, 2, 0,            /* 0x63 */
 762                 {{0, 1},
 763                 {5, 6},
 764                 {0, 0},
 765                 {0, 0}
 766                 }
 767         },
 768         {0, 0, 2, 0,            /* 0x64 */
 769                 {{2, 2},
 770                 {5, 6},
 771                 {0, 0},
 772                 {0, 0}
 773                 }
 774         },
 775         {1, 0, 3, 0,            /* 0x65 */
 776                 {{0, 0},
 777                 {2, 2},
 778                 {5, 6},
 779                 {0, 0}
 780                 }
 781         },
 782         {0, 0, 2, 0,            /* 0x66 */
 783                 {{1, 2},
 784                 {5, 6},
 785                 {0, 0},
 786                 {0, 0}
 787                 }
 788         },
 789         {1, 0, 2, 0,            /* 0x67 */
 790                 {{0, 2},
 791                 {5, 6},
 792                 {0, 0},
 793                 {0, 0}
 794                 }
 795         },
 796         {0, 0, 2, 0,            /* 0x68 */
 797                 {{3, 3},
 798                 {5, 6},
 799                 {0, 0},
 800                 {0, 0}
 801                 }
 802         },
 803         {1, 0, 3, 0,            /* 0x69 */
 804                 {{0, 0},
 805                 {3, 3},
 806                 {5, 6},
 807                 {0, 0}
 808                 }
 809         },
 810         {0, 0, 3, 0,            /* 0x6a */
 811                 {{1, 1},
 812                 {3, 3},
 813                 {5, 6},
 814                 {0, 0}
 815                 }
 816         },
 817         {1, 0, 3, 0,            /* 0x6b */
 818                 {{0, 1},
 819                 {3, 3},
 820                 {5, 6},
 821                 {0, 0}
 822                 }
 823         },
 824         {0, 0, 2, 0,            /* 0x6c */
 825                 {{2, 3},
 826                 {5, 6},
 827                 {0, 0},
 828                 {0, 0}
 829                 }
 830         },
 831         {1, 0, 3, 0,            /* 0x6d */
 832                 {{0, 0},
 833                 {2, 3},
 834                 {5, 6},
 835                 {0, 0}
 836                 }
 837         },
 838         {0, 0, 2, 0,            /* 0x6e */
 839                 {{1, 3},
 840                 {5, 6},
 841                 {0, 0},
 842                 {0, 0}
 843                 }
 844         },
 845         {1, 0, 2, 0,            /* 0x6f */
 846                 {{0, 3},
 847                 {5, 6},
 848                 {0, 0},
 849                 {0, 0}
 850                 }
 851         },
 852         {0, 0, 1, 0,            /* 0x70 */
 853                 {{4, 6},
 854                 {0, 0},
 855                 {0, 0},
 856                 {0, 0}
 857                 }
 858         },
 859         {1, 0, 2, 0,            /* 0x71 */
 860                 {{0, 0},
 861                 {4, 6},
 862                 {0, 0},
 863                 {0, 0}
 864                 }
 865         },
 866         {0, 0, 2, 0,            /* 0x72 */
 867                 {{1, 1},
 868                 {4, 6},
 869                 {0, 0},
 870                 {0, 0}
 871                 }
 872         },
 873         {1, 0, 2, 0,            /* 0x73 */
 874                 {{0, 1},
 875                 {4, 6},
 876                 {0, 0},
 877                 {0, 0}
 878                 }
 879         },
 880         {0, 0, 2, 0,            /* 0x74 */
 881                 {{2, 2},
 882                 {4, 6},
 883                 {0, 0},
 884                 {0, 0}
 885                 }
 886         },
 887         {1, 0, 3, 0,            /* 0x75 */
 888                 {{0, 0},
 889                 {2, 2},
 890                 {4, 6},
 891                 {0, 0}
 892                 }
 893         },
 894         {0, 0, 2, 0,            /* 0x76 */
 895                 {{1, 2},
 896                 {4, 6},
 897                 {0, 0},
 898                 {0, 0}
 899                 }
 900         },
 901         {1, 0, 2, 0,            /* 0x77 */
 902                 {{0, 2},
 903                 {4, 6},
 904                 {0, 0},
 905                 {0, 0}
 906                 }
 907         },
 908         {0, 0, 1, 0,            /* 0x78 */
 909                 {{3, 6},
 910                 {0, 0},
 911                 {0, 0},
 912                 {0, 0}
 913                 }
 914         },
 915         {1, 0, 2, 0,            /* 0x79 */
 916                 {{0, 0},
 917                 {3, 6},
 918                 {0, 0},
 919                 {0, 0}
 920                 }
 921         },
 922         {0, 0, 2, 0,            /* 0x7a */
 923                 {{1, 1},
 924                 {3, 6},
 925                 {0, 0},
 926                 {0, 0}
 927                 }
 928         },
 929         {1, 0, 2, 0,            /* 0x7b */
 930                 {{0, 1},
 931                 {3, 6},
 932                 {0, 0},
 933                 {0, 0}
 934                 }
 935         },
 936         {0, 0, 1, 0,            /* 0x7c */
 937                 {{2, 6},
 938                 {0, 0},
 939                 {0, 0},
 940                 {0, 0}
 941                 }
 942         },
 943         {1, 0, 2, 0,            /* 0x7d */
 944                 {{0, 0},
 945                 {2, 6},
 946                 {0, 0},
 947                 {0, 0}
 948                 }
 949         },
 950         {0, 0, 1, 0,            /* 0x7e */
 951                 {{1, 6},
 952                 {0, 0},
 953                 {0, 0},
 954                 {0, 0}
 955                 }
 956         },
 957         {1, 0, 1, 0,            /* 0x7f */
 958                 {{0, 6},
 959                 {0, 0},
 960                 {0, 0},
 961                 {0, 0}
 962                 }
 963         },
 964         {0, 1, 1, 0,            /* 0x80 */
 965                 {{7, 7},
 966                 {0, 0},
 967                 {0, 0},
 968                 {0, 0}
 969                 }
 970         },
 971         {1, 1, 2, 0,            /* 0x81 */
 972                 {{0, 0},
 973                 {7, 7},
 974                 {0, 0},
 975                 {0, 0}
 976                 }
 977         },
 978         {0, 1, 2, 0,            /* 0x82 */
 979                 {{1, 1},
 980                 {7, 7},
 981                 {0, 0},
 982                 {0, 0}
 983                 }
 984         },
 985         {1, 1, 2, 0,            /* 0x83 */
 986                 {{0, 1},
 987                 {7, 7},
 988                 {0, 0},
 989                 {0, 0}
 990                 }
 991         },
 992         {0, 1, 2, 0,            /* 0x84 */
 993                 {{2, 2},
 994                 {7, 7},
 995                 {0, 0},
 996                 {0, 0}
 997                 }
 998         },
 999         {1, 1, 3, 0,            /* 0x85 */
1000                 {{0, 0},
1001                 {2, 2},
1002                 {7, 7},
1003                 {0, 0}
1004                 }
1005         },
1006         {0, 1, 2, 0,            /* 0x86 */
1007                 {{1, 2},
1008                 {7, 7},
1009                 {0, 0},
1010                 {0, 0}
1011                 }
1012         },
1013         {1, 1, 2, 0,            /* 0x87 */
1014                 {{0, 2},
1015                 {7, 7},
1016                 {0, 0},
1017                 {0, 0}
1018                 }
1019         },
1020         {0, 1, 2, 0,            /* 0x88 */
1021                 {{3, 3},
1022                 {7, 7},
1023                 {0, 0},
1024                 {0, 0}
1025                 }
1026         },
1027         {1, 1, 3, 0,            /* 0x89 */
1028                 {{0, 0},
1029                 {3, 3},
1030                 {7, 7},
1031                 {0, 0}
1032                 }
1033         },
1034         {0, 1, 3, 0,            /* 0x8a */
1035                 {{1, 1},
1036                 {3, 3},
1037                 {7, 7},
1038                 {0, 0}
1039                 }
1040         },
1041         {1, 1, 3, 0,            /* 0x8b */
1042                 {{0, 1},
1043                 {3, 3},
1044                 {7, 7},
1045                 {0, 0}
1046                 }
1047         },
1048         {0, 1, 2, 0,            /* 0x8c */
1049                 {{2, 3},
1050                 {7, 7},
1051                 {0, 0},
1052                 {0, 0}
1053                 }
1054         },
1055         {1, 1, 3, 0,            /* 0x8d */
1056                 {{0, 0},
1057                 {2, 3},
1058                 {7, 7},
1059                 {0, 0}
1060                 }
1061         },
1062         {0, 1, 2, 0,            /* 0x8e */
1063                 {{1, 3},
1064                 {7, 7},
1065                 {0, 0},
1066                 {0, 0}
1067                 }
1068         },
1069         {1, 1, 2, 0,            /* 0x8f */
1070                 {{0, 3},
1071                 {7, 7},
1072                 {0, 0},
1073                 {0, 0}
1074                 }
1075         },
1076         {0, 1, 2, 0,            /* 0x90 */
1077                 {{4, 4},
1078                 {7, 7},
1079                 {0, 0},
1080                 {0, 0}
1081                 }
1082         },
1083         {1, 1, 3, 0,            /* 0x91 */
1084                 {{0, 0},
1085                 {4, 4},
1086                 {7, 7},
1087                 {0, 0}
1088                 }
1089         },
1090         {0, 1, 3, 0,            /* 0x92 */
1091                 {{1, 1},
1092                 {4, 4},
1093                 {7, 7},
1094                 {0, 0}
1095                 }
1096         },
1097         {1, 1, 3, 0,            /* 0x93 */
1098                 {{0, 1},
1099                 {4, 4},
1100                 {7, 7},
1101                 {0, 0}
1102                 }
1103         },
1104         {0, 1, 3, 0,            /* 0x94 */
1105                 {{2, 2},
1106                 {4, 4},
1107                 {7, 7},
1108                 {0, 0}
1109                 }
1110         },
1111         {1, 1, 4, 0,            /* 0x95 */
1112                 {{0, 0},
1113                 {2, 2},
1114                 {4, 4},
1115                 {7, 7}
1116                 }
1117         },
1118         {0, 1, 3, 0,            /* 0x96 */
1119                 {{1, 2},
1120                 {4, 4},
1121                 {7, 7},
1122                 {0, 0}
1123                 }
1124         },
1125         {1, 1, 3, 0,            /* 0x97 */
1126                 {{0, 2},
1127                 {4, 4},
1128                 {7, 7},
1129                 {0, 0}
1130                 }
1131         },
1132         {0, 1, 2, 0,            /* 0x98 */
1133                 {{3, 4},
1134                 {7, 7},
1135                 {0, 0},
1136                 {0, 0}
1137                 }
1138         },
1139         {1, 1, 3, 0,            /* 0x99 */
1140                 {{0, 0},
1141                 {3, 4},
1142                 {7, 7},
1143                 {0, 0}
1144                 }
1145         },
1146         {0, 1, 3, 0,            /* 0x9a */
1147                 {{1, 1},
1148                 {3, 4},
1149                 {7, 7},
1150                 {0, 0}
1151                 }
1152         },
1153         {1, 1, 3, 0,            /* 0x9b */
1154                 {{0, 1},
1155                 {3, 4},
1156                 {7, 7},
1157                 {0, 0}
1158                 }
1159         },
1160         {0, 1, 2, 0,            /* 0x9c */
1161                 {{2, 4},
1162                 {7, 7},
1163                 {0, 0},
1164                 {0, 0}
1165                 }
1166         },
1167         {1, 1, 3, 0,            /* 0x9d */
1168                 {{0, 0},
1169                 {2, 4},
1170                 {7, 7},
1171                 {0, 0}
1172                 }
1173         },
1174         {0, 1, 2, 0,            /* 0x9e */
1175                 {{1, 4},
1176                 {7, 7},
1177                 {0, 0},
1178                 {0, 0}
1179                 }
1180         },
1181         {1, 1, 2, 0,            /* 0x9f */
1182                 {{0, 4},
1183                 {7, 7},
1184                 {0, 0},
1185                 {0, 0}
1186                 }
1187         },
1188         {0, 1, 2, 0,            /* 0xa0 */
1189                 {{5, 5},
1190                 {7, 7},
1191                 {0, 0},
1192                 {0, 0}
1193                 }
1194         },
1195         {1, 1, 3, 0,            /* 0xa1 */
1196                 {{0, 0},
1197                 {5, 5},
1198                 {7, 7},
1199                 {0, 0}
1200                 }
1201         },
1202         {0, 1, 3, 0,            /* 0xa2 */
1203                 {{1, 1},
1204                 {5, 5},
1205                 {7, 7},
1206                 {0, 0}
1207                 }
1208         },
1209         {1, 1, 3, 0,            /* 0xa3 */
1210                 {{0, 1},
1211                 {5, 5},
1212                 {7, 7},
1213                 {0, 0}
1214                 }
1215         },
1216         {0, 1, 3, 0,            /* 0xa4 */
1217                 {{2, 2},
1218                 {5, 5},
1219                 {7, 7},
1220                 {0, 0}
1221                 }
1222         },
1223         {1, 1, 4, 0,            /* 0xa5 */
1224                 {{0, 0},
1225                 {2, 2},
1226                 {5, 5},
1227                 {7, 7}
1228                 }
1229         },
1230         {0, 1, 3, 0,            /* 0xa6 */
1231                 {{1, 2},
1232                 {5, 5},
1233                 {7, 7},
1234                 {0, 0}
1235                 }
1236         },
1237         {1, 1, 3, 0,            /* 0xa7 */
1238                 {{0, 2},
1239                 {5, 5},
1240                 {7, 7},
1241                 {0, 0}
1242                 }
1243         },
1244         {0, 1, 3, 0,            /* 0xa8 */
1245                 {{3, 3},
1246                 {5, 5},
1247                 {7, 7},
1248                 {0, 0}
1249                 }
1250         },
1251         {1, 1, 4, 0,            /* 0xa9 */
1252                 {{0, 0},
1253                 {3, 3},
1254                 {5, 5},
1255                 {7, 7}
1256                 }
1257         },
1258         {0, 1, 4, 0,            /* 0xaa */
1259                 {{1, 1},
1260                 {3, 3},
1261                 {5, 5},
1262                 {7, 7}
1263                 }
1264         },
1265         {1, 1, 4, 0,            /* 0xab */
1266                 {{0, 1},
1267                 {3, 3},
1268                 {5, 5},
1269                 {7, 7}
1270                 }
1271         },
1272         {0, 1, 3, 0,            /* 0xac */
1273                 {{2, 3},
1274                 {5, 5},
1275                 {7, 7},
1276                 {0, 0}
1277                 }
1278         },
1279         {1, 1, 4, 0,            /* 0xad */
1280                 {{0, 0},
1281                 {2, 3},
1282                 {5, 5},
1283                 {7, 7}
1284                 }
1285         },
1286         {0, 1, 3, 0,            /* 0xae */
1287                 {{1, 3},
1288                 {5, 5},
1289                 {7, 7},
1290                 {0, 0}
1291                 }
1292         },
1293         {1, 1, 3, 0,            /* 0xaf */
1294                 {{0, 3},
1295                 {5, 5},
1296                 {7, 7},
1297                 {0, 0}
1298                 }
1299         },
1300         {0, 1, 2, 0,            /* 0xb0 */
1301                 {{4, 5},
1302                 {7, 7},
1303                 {0, 0},
1304                 {0, 0}
1305                 }
1306         },
1307         {1, 1, 3, 0,            /* 0xb1 */
1308                 {{0, 0},
1309                 {4, 5},
1310                 {7, 7},
1311                 {0, 0}
1312                 }
1313         },
1314         {0, 1, 3, 0,            /* 0xb2 */
1315                 {{1, 1},
1316                 {4, 5},
1317                 {7, 7},
1318                 {0, 0}
1319                 }
1320         },
1321         {1, 1, 3, 0,            /* 0xb3 */
1322                 {{0, 1},
1323                 {4, 5},
1324                 {7, 7},
1325                 {0, 0}
1326                 }
1327         },
1328         {0, 1, 3, 0,            /* 0xb4 */
1329                 {{2, 2},
1330                 {4, 5},
1331                 {7, 7},
1332                 {0, 0}
1333                 }
1334         },
1335         {1, 1, 4, 0,            /* 0xb5 */
1336                 {{0, 0},
1337                 {2, 2},
1338                 {4, 5},
1339                 {7, 7}
1340                 }
1341         },
1342         {0, 1, 3, 0,            /* 0xb6 */
1343                 {{1, 2},
1344                 {4, 5},
1345                 {7, 7},
1346                 {0, 0}
1347                 }
1348         },
1349         {1, 1, 3, 0,            /* 0xb7 */
1350                 {{0, 2},
1351                 {4, 5},
1352                 {7, 7},
1353                 {0, 0}
1354                 }
1355         },
1356         {0, 1, 2, 0,            /* 0xb8 */
1357                 {{3, 5},
1358                 {7, 7},
1359                 {0, 0},
1360                 {0, 0}
1361                 }
1362         },
1363         {1, 1, 3, 0,            /* 0xb9 */
1364                 {{0, 0},
1365                 {3, 5},
1366                 {7, 7},
1367                 {0, 0}
1368                 }
1369         },
1370         {0, 1, 3, 0,            /* 0xba */
1371                 {{1, 1},
1372                 {3, 5},
1373                 {7, 7},
1374                 {0, 0}
1375                 }
1376         },
1377         {1, 1, 3, 0,            /* 0xbb */
1378                 {{0, 1},
1379                 {3, 5},
1380                 {7, 7},
1381                 {0, 0}
1382                 }
1383         },
1384         {0, 1, 2, 0,            /* 0xbc */
1385                 {{2, 5},
1386                 {7, 7},
1387                 {0, 0},
1388                 {0, 0}
1389                 }
1390         },
1391         {1, 1, 3, 0,            /* 0xbd */
1392                 {{0, 0},
1393                 {2, 5},
1394                 {7, 7},
1395                 {0, 0}
1396                 }
1397         },
1398         {0, 1, 2, 0,            /* 0xbe */
1399                 {{1, 5},
1400                 {7, 7},
1401                 {0, 0},
1402                 {0, 0}
1403                 }
1404         },
1405         {1, 1, 2, 0,            /* 0xbf */
1406                 {{0, 5},
1407                 {7, 7},
1408                 {0, 0},
1409                 {0, 0}
1410                 }
1411         },
1412         {0, 1, 1, 0,            /* 0xc0 */
1413                 {{6, 7},
1414                 {0, 0},
1415                 {0, 0},
1416                 {0, 0}
1417                 }
1418         },
1419         {1, 1, 2, 0,            /* 0xc1 */
1420                 {{0, 0},
1421                 {6, 7},
1422                 {0, 0},
1423                 {0, 0}
1424                 }
1425         },
1426         {0, 1, 2, 0,            /* 0xc2 */
1427                 {{1, 1},
1428                 {6, 7},
1429                 {0, 0},
1430                 {0, 0}
1431                 }
1432         },
1433         {1, 1, 2, 0,            /* 0xc3 */
1434                 {{0, 1},
1435                 {6, 7},
1436                 {0, 0},
1437                 {0, 0}
1438                 }
1439         },
1440         {0, 1, 2, 0,            /* 0xc4 */
1441                 {{2, 2},
1442                 {6, 7},
1443                 {0, 0},
1444                 {0, 0}
1445                 }
1446         },
1447         {1, 1, 3, 0,            /* 0xc5 */
1448                 {{0, 0},
1449                 {2, 2},
1450                 {6, 7},
1451                 {0, 0}
1452                 }
1453         },
1454         {0, 1, 2, 0,            /* 0xc6 */
1455                 {{1, 2},
1456                 {6, 7},
1457                 {0, 0},
1458                 {0, 0}
1459                 }
1460         },
1461         {1, 1, 2, 0,            /* 0xc7 */
1462                 {{0, 2},
1463                 {6, 7},
1464                 {0, 0},
1465                 {0, 0}
1466                 }
1467         },
1468         {0, 1, 2, 0,            /* 0xc8 */
1469                 {{3, 3},
1470                 {6, 7},
1471                 {0, 0},
1472                 {0, 0}
1473                 }
1474         },
1475         {1, 1, 3, 0,            /* 0xc9 */
1476                 {{0, 0},
1477                 {3, 3},
1478                 {6, 7},
1479                 {0, 0}
1480                 }
1481         },
1482         {0, 1, 3, 0,            /* 0xca */
1483                 {{1, 1},
1484                 {3, 3},
1485                 {6, 7},
1486                 {0, 0}
1487                 }
1488         },
1489         {1, 1, 3, 0,            /* 0xcb */
1490                 {{0, 1},
1491                 {3, 3},
1492                 {6, 7},
1493                 {0, 0}
1494                 }
1495         },
1496         {0, 1, 2, 0,            /* 0xcc */
1497                 {{2, 3},
1498                 {6, 7},
1499                 {0, 0},
1500                 {0, 0}
1501                 }
1502         },
1503         {1, 1, 3, 0,            /* 0xcd */
1504                 {{0, 0},
1505                 {2, 3},
1506                 {6, 7},
1507                 {0, 0}
1508                 }
1509         },
1510         {0, 1, 2, 0,            /* 0xce */
1511                 {{1, 3},
1512                 {6, 7},
1513                 {0, 0},
1514                 {0, 0}
1515                 }
1516         },
1517         {1, 1, 2, 0,            /* 0xcf */
1518                 {{0, 3},
1519                 {6, 7},
1520                 {0, 0},
1521                 {0, 0}
1522                 }
1523         },
1524         {0, 1, 2, 0,            /* 0xd0 */
1525                 {{4, 4},
1526                 {6, 7},
1527                 {0, 0},
1528                 {0, 0}
1529                 }
1530         },
1531         {1, 1, 3, 0,            /* 0xd1 */
1532                 {{0, 0},
1533                 {4, 4},
1534                 {6, 7},
1535                 {0, 0}
1536                 }
1537         },
1538         {0, 1, 3, 0,            /* 0xd2 */
1539                 {{1, 1},
1540                 {4, 4},
1541                 {6, 7},
1542                 {0, 0}
1543                 }
1544         },
1545         {1, 1, 3, 0,            /* 0xd3 */
1546                 {{0, 1},
1547                 {4, 4},
1548                 {6, 7},
1549                 {0, 0}
1550                 }
1551         },
1552         {0, 1, 3, 0,            /* 0xd4 */
1553                 {{2, 2},
1554                 {4, 4},
1555                 {6, 7},
1556                 {0, 0}
1557                 }
1558         },
1559         {1, 1, 4, 0,            /* 0xd5 */
1560                 {{0, 0},
1561                 {2, 2},
1562                 {4, 4},
1563                 {6, 7}
1564                 }
1565         },
1566         {0, 1, 3, 0,            /* 0xd6 */
1567                 {{1, 2},
1568                 {4, 4},
1569                 {6, 7},
1570                 {0, 0}
1571                 }
1572         },
1573         {1, 1, 3, 0,            /* 0xd7 */
1574                 {{0, 2},
1575                 {4, 4},
1576                 {6, 7},
1577                 {0, 0}
1578                 }
1579         },
1580         {0, 1, 2, 0,            /* 0xd8 */
1581                 {{3, 4},
1582                 {6, 7},
1583                 {0, 0},
1584                 {0, 0}
1585                 }
1586         },
1587         {1, 1, 3, 0,            /* 0xd9 */
1588                 {{0, 0},
1589                 {3, 4},
1590                 {6, 7},
1591                 {0, 0}
1592                 }
1593         },
1594         {0, 1, 3, 0,            /* 0xda */
1595                 {{1, 1},
1596                 {3, 4},
1597                 {6, 7},
1598                 {0, 0}
1599                 }
1600         },
1601         {1, 1, 3, 0,            /* 0xdb */
1602                 {{0, 1},
1603                 {3, 4},
1604                 {6, 7},
1605                 {0, 0}
1606                 }
1607         },
1608         {0, 1, 2, 0,            /* 0xdc */
1609                 {{2, 4},
1610                 {6, 7},
1611                 {0, 0},
1612                 {0, 0}
1613                 }
1614         },
1615         {1, 1, 3, 0,            /* 0xdd */
1616                 {{0, 0},
1617                 {2, 4},
1618                 {6, 7},
1619                 {0, 0}
1620                 }
1621         },
1622         {0, 1, 2, 0,            /* 0xde */
1623                 {{1, 4},
1624                 {6, 7},
1625                 {0, 0},
1626                 {0, 0}
1627                 }
1628         },
1629         {1, 1, 2, 0,            /* 0xdf */
1630                 {{0, 4},
1631                 {6, 7},
1632                 {0, 0},
1633                 {0, 0}
1634                 }
1635         },
1636         {0, 1, 1, 0,            /* 0xe0 */
1637                 {{5, 7},
1638                 {0, 0},
1639                 {0, 0},
1640                 {0, 0}
1641                 }
1642         },
1643         {1, 1, 2, 0,            /* 0xe1 */
1644                 {{0, 0},
1645                 {5, 7},
1646                 {0, 0},
1647                 {0, 0}
1648                 }
1649         },
1650         {0, 1, 2, 0,            /* 0xe2 */
1651                 {{1, 1},
1652                 {5, 7},
1653                 {0, 0},
1654                 {0, 0}
1655                 }
1656         },
1657         {1, 1, 2, 0,            /* 0xe3 */
1658                 {{0, 1},
1659                 {5, 7},
1660                 {0, 0},
1661                 {0, 0}
1662                 }
1663         },
1664         {0, 1, 2, 0,            /* 0xe4 */
1665                 {{2, 2},
1666                 {5, 7},
1667                 {0, 0},
1668                 {0, 0}
1669                 }
1670         },
1671         {1, 1, 3, 0,            /* 0xe5 */
1672                 {{0, 0},
1673                 {2, 2},
1674                 {5, 7},
1675                 {0, 0}
1676                 }
1677         },
1678         {0, 1, 2, 0,            /* 0xe6 */
1679                 {{1, 2},
1680                 {5, 7},
1681                 {0, 0},
1682                 {0, 0}
1683                 }
1684         },
1685         {1, 1, 2, 0,            /* 0xe7 */
1686                 {{0, 2},
1687                 {5, 7},
1688                 {0, 0},
1689                 {0, 0}
1690                 }
1691         },
1692         {0, 1, 2, 0,            /* 0xe8 */
1693                 {{3, 3},
1694                 {5, 7},
1695                 {0, 0},
1696                 {0, 0}
1697                 }
1698         },
1699         {1, 1, 3, 0,            /* 0xe9 */
1700                 {{0, 0},
1701                 {3, 3},
1702                 {5, 7},
1703                 {0, 0}
1704                 }
1705         },
1706         {0, 1, 3, 0,            /* 0xea */
1707                 {{1, 1},
1708                 {3, 3},
1709                 {5, 7},
1710                 {0, 0}
1711                 }
1712         },
1713         {1, 1, 3, 0,            /* 0xeb */
1714                 {{0, 1},
1715                 {3, 3},
1716                 {5, 7},
1717                 {0, 0}
1718                 }
1719         },
1720         {0, 1, 2, 0,            /* 0xec */
1721                 {{2, 3},
1722                 {5, 7},
1723                 {0, 0},
1724                 {0, 0}
1725                 }
1726         },
1727         {1, 1, 3, 0,            /* 0xed */
1728                 {{0, 0},
1729                 {2, 3},
1730                 {5, 7},
1731                 {0, 0}
1732                 }
1733         },
1734         {0, 1, 2, 0,            /* 0xee */
1735                 {{1, 3},
1736                 {5, 7},
1737                 {0, 0},
1738                 {0, 0}
1739                 }
1740         },
1741         {1, 1, 2, 0,            /* 0xef */
1742                 {{0, 3},
1743                 {5, 7},
1744                 {0, 0},
1745                 {0, 0}
1746                 }
1747         },
1748         {0, 1, 1, 0,            /* 0xf0 */
1749                 {{4, 7},
1750                 {0, 0},
1751                 {0, 0},
1752                 {0, 0}
1753                 }
1754         },
1755         {1, 1, 2, 0,            /* 0xf1 */
1756                 {{0, 0},
1757                 {4, 7},
1758                 {0, 0},
1759                 {0, 0}
1760                 }
1761         },
1762         {0, 1, 2, 0,            /* 0xf2 */
1763                 {{1, 1},
1764                 {4, 7},
1765                 {0, 0},
1766                 {0, 0}
1767                 }
1768         },
1769         {1, 1, 2, 0,            /* 0xf3 */
1770                 {{0, 1},
1771                 {4, 7},
1772                 {0, 0},
1773                 {0, 0}
1774                 }
1775         },
1776         {0, 1, 2, 0,            /* 0xf4 */
1777                 {{2, 2},
1778                 {4, 7},
1779                 {0, 0},
1780                 {0, 0}
1781                 }
1782         },
1783         {1, 1, 3, 0,            /* 0xf5 */
1784                 {{0, 0},
1785                 {2, 2},
1786                 {4, 7},
1787                 {0, 0}
1788                 }
1789         },
1790         {0, 1, 2, 0,            /* 0xf6 */
1791                 {{1, 2},
1792                 {4, 7},
1793                 {0, 0},
1794                 {0, 0}
1795                 }
1796         },
1797         {1, 1, 2, 0,            /* 0xf7 */
1798                 {{0, 2},
1799                 {4, 7},
1800                 {0, 0},
1801                 {0, 0}
1802                 }
1803         },
1804         {0, 1, 1, 0,            /* 0xf8 */
1805                 {{3, 7},
1806                 {0, 0},
1807                 {0, 0},
1808                 {0, 0}
1809                 }
1810         },
1811         {1, 1, 2, 0,            /* 0xf9 */
1812                 {{0, 0},
1813                 {3, 7},
1814                 {0, 0},
1815                 {0, 0}
1816                 }
1817         },
1818         {0, 1, 2, 0,            /* 0xfa */
1819                 {{1, 1},
1820                 {3, 7},
1821                 {0, 0},
1822                 {0, 0}
1823                 }
1824         },
1825         {1, 1, 2, 0,            /* 0xfb */
1826                 {{0, 1},
1827                 {3, 7},
1828                 {0, 0},
1829                 {0, 0}
1830                 }
1831         },
1832         {0, 1, 1, 0,            /* 0xfc */
1833                 {{2, 7},
1834                 {0, 0},
1835                 {0, 0},
1836                 {0, 0}
1837                 }
1838         },
1839         {1, 1, 2, 0,            /* 0xfd */
1840                 {{0, 0},
1841                 {2, 7},
1842                 {0, 0},
1843                 {0, 0}
1844                 }
1845         },
1846         {0, 1, 1, 0,            /* 0xfe */
1847                 {{1, 7},
1848                 {0, 0},
1849                 {0, 0},
1850                 {0, 0}
1851                 }
1852         },
1853         {1, 1, 1, 0,            /* 0xff */
1854                 {{0, 7},
1855                 {0, 0},
1856                 {0, 0},
1857                 {0, 0}
1858                 }
1859         }
1860 };
1861
1862
1863 int
1864 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1865     int ipv4_addr_legal,
1866     int ipv6_addr_legal,
1867     int loopback_scope,
1868     int ipv4_local_scope,
1869     int local_scope,
1870     int site_scope,
1871     int do_update)
1872 {
1873         if ((loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881         case AF_INET:
1882                 if (ipv4_addr_legal) {
1883                         struct sockaddr_in *sin;
1884
1885                         sin = (struct sockaddr_in *)&ifa->address.sin;
1886                         if (sin->sin_addr.s_addr == 0) {
1887                                 /* not in scope , unspecified */
1888                                 return (0);
1889                         }
1890                         if ((ipv4_local_scope == 0) &&
1891                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1892                                 /* private address not in scope */
1893                                 return (0);
1894                         }
1895                 } else {
1896                         return (0);
1897                 }
1898                 break;
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1941 {
1942         struct sctp_paramhdr *parmh;
1943         struct mbuf *mret;
1944         int len;
1945
1946         if (ifa->address.sa.sa_family == AF_INET) {
1947                 len = sizeof(struct sctp_ipv4addr_param);
1948         } else if (ifa->address.sa.sa_family == AF_INET6) {
1949                 len = sizeof(struct sctp_ipv6addr_param);
1950         } else {
1951                 /* unknown type */
1952                 return (m);
1953         }
1954         if (M_TRAILINGSPACE(m) >= len) {
1955                 /* easy side we just drop it on the end */
1956                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1957                 mret = m;
1958         } else {
1959                 /* Need more space */
1960                 mret = m;
1961                 while (SCTP_BUF_NEXT(mret) != NULL) {
1962                         mret = SCTP_BUF_NEXT(mret);
1963                 }
1964                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1965                 if (SCTP_BUF_NEXT(mret) == NULL) {
1966                         /* We are hosed, can't add more addresses */
1967                         return (m);
1968                 }
1969                 mret = SCTP_BUF_NEXT(mret);
1970                 parmh = mtod(mret, struct sctp_paramhdr *);
1971         }
1972         /* now add the parameter */
1973         switch (ifa->address.sa.sa_family) {
1974         case AF_INET:
1975                 {
1976                         struct sctp_ipv4addr_param *ipv4p;
1977                         struct sockaddr_in *sin;
1978
1979                         sin = (struct sockaddr_in *)&ifa->address.sin;
1980                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1981                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1982                         parmh->param_length = htons(len);
1983                         ipv4p->addr = sin->sin_addr.s_addr;
1984                         SCTP_BUF_LEN(mret) += len;
1985                         break;
1986                 }
1987 #ifdef INET6
1988         case AF_INET6:
1989                 {
1990                         struct sctp_ipv6addr_param *ipv6p;
1991                         struct sockaddr_in6 *sin6;
1992
1993                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1994                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1995                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1996                         parmh->param_length = htons(len);
1997                         memcpy(ipv6p->addr, &sin6->sin6_addr,
1998                             sizeof(ipv6p->addr));
1999                         /* clear embedded scope in the address */
2000                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2001                         SCTP_BUF_LEN(mret) += len;
2002                         break;
2003                 }
2004 #endif
2005         default:
2006                 return (m);
2007         }
2008         return (mret);
2009 }
2010
2011
2012 struct mbuf *
2013 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2014     struct mbuf *m_at, int cnt_inits_to)
2015 {
2016         struct sctp_vrf *vrf = NULL;
2017         int cnt, limit_out = 0, total_count;
2018         uint32_t vrf_id;
2019
2020         vrf_id = inp->def_vrf_id;
2021         SCTP_IPI_ADDR_RLOCK();
2022         vrf = sctp_find_vrf(vrf_id);
2023         if (vrf == NULL) {
2024                 SCTP_IPI_ADDR_RUNLOCK();
2025                 return (m_at);
2026         }
2027         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2028                 struct sctp_ifa *sctp_ifap;
2029                 struct sctp_ifn *sctp_ifnp;
2030
2031                 cnt = cnt_inits_to;
2032                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2033                         limit_out = 1;
2034                         cnt = SCTP_ADDRESS_LIMIT;
2035                         goto skip_count;
2036                 }
2037                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2038                         if ((scope->loopback_scope == 0) &&
2039                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2040                                 /*
2041                                  * Skip loopback devices if loopback_scope
2042                                  * not set
2043                                  */
2044                                 continue;
2045                         }
2046                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2047                                 if (sctp_is_address_in_scope(sctp_ifap,
2048                                     scope->ipv4_addr_legal,
2049                                     scope->ipv6_addr_legal,
2050                                     scope->loopback_scope,
2051                                     scope->ipv4_local_scope,
2052                                     scope->local_scope,
2053                                     scope->site_scope, 1) == 0) {
2054                                         continue;
2055                                 }
2056                                 cnt++;
2057                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2058                                         break;
2059                                 }
2060                         }
2061                         if (cnt > SCTP_ADDRESS_LIMIT) {
2062                                 break;
2063                         }
2064                 }
2065 skip_count:
2066                 if (cnt > 1) {
2067                         total_count = 0;
2068                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2069                                 cnt = 0;
2070                                 if ((scope->loopback_scope == 0) &&
2071                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2072                                         /*
2073                                          * Skip loopback devices if
2074                                          * loopback_scope not set
2075                                          */
2076                                         continue;
2077                                 }
2078                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2079                                         if (sctp_is_address_in_scope(sctp_ifap,
2080                                             scope->ipv4_addr_legal,
2081                                             scope->ipv6_addr_legal,
2082                                             scope->loopback_scope,
2083                                             scope->ipv4_local_scope,
2084                                             scope->local_scope,
2085                                             scope->site_scope, 0) == 0) {
2086                                                 continue;
2087                                         }
2088                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2089                                         if (limit_out) {
2090                                                 cnt++;
2091                                                 total_count++;
2092                                                 if (cnt >= 2) {
2093                                                         /*
2094                                                          * two from each
2095                                                          * address
2096                                                          */
2097                                                         break;
2098                                                 }
2099                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2100                                                         /* No more addresses */
2101                                                         break;
2102                                                 }
2103                                         }
2104                                 }
2105                         }
2106                 }
2107         } else {
2108                 struct sctp_laddr *laddr;
2109
2110                 cnt = cnt_inits_to;
2111                 /* First, how many ? */
2112                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2113                         if (laddr->ifa == NULL) {
2114                                 continue;
2115                         }
2116                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2117                                 /*
2118                                  * Address being deleted by the system, dont
2119                                  * list.
2120                                  */
2121                                 continue;
2122                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2123                                 /*
2124                                  * Address being deleted on this ep don't
2125                                  * list.
2126                                  */
2127                                 continue;
2128                         }
2129                         if (sctp_is_address_in_scope(laddr->ifa,
2130                             scope->ipv4_addr_legal,
2131                             scope->ipv6_addr_legal,
2132                             scope->loopback_scope,
2133                             scope->ipv4_local_scope,
2134                             scope->local_scope,
2135                             scope->site_scope, 1) == 0) {
2136                                 continue;
2137                         }
2138                         cnt++;
2139                 }
2140                 if (cnt > SCTP_ADDRESS_LIMIT) {
2141                         limit_out = 1;
2142                 }
2143                 /*
2144                  * To get through a NAT we only list addresses if we have
2145                  * more than one. That way if you just bind a single address
2146                  * we let the source of the init dictate our address.
2147                  */
2148                 if (cnt > 1) {
2149                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2150                                 cnt = 0;
2151                                 if (laddr->ifa == NULL) {
2152                                         continue;
2153                                 }
2154                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2155                                         continue;
2156
2157                                 if (sctp_is_address_in_scope(laddr->ifa,
2158                                     scope->ipv4_addr_legal,
2159                                     scope->ipv6_addr_legal,
2160                                     scope->loopback_scope,
2161                                     scope->ipv4_local_scope,
2162                                     scope->local_scope,
2163                                     scope->site_scope, 0) == 0) {
2164                                         continue;
2165                                 }
2166                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2167                                 cnt++;
2168                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2169                                         break;
2170                                 }
2171                         }
2172                 }
2173         }
2174         SCTP_IPI_ADDR_RUNLOCK();
2175         return (m_at);
2176 }
2177
2178 static struct sctp_ifa *
2179 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2180     uint8_t dest_is_loop,
2181     uint8_t dest_is_priv,
2182     sa_family_t fam)
2183 {
2184         uint8_t dest_is_global = 0;
2185
2186         /* dest_is_priv is true if destination is a private address */
2187         /* dest_is_loop is true if destination is a loopback addresses */
2188
2189         /**
2190          * Here we determine if its a preferred address. A preferred address
2191          * means it is the same scope or higher scope then the destination.
2192          * L = loopback, P = private, G = global
2193          * -----------------------------------------
2194          *    src    |  dest | result
2195          *  ----------------------------------------
2196          *     L     |    L  |    yes
2197          *  -----------------------------------------
2198          *     P     |    L  |    yes-v4 no-v6
2199          *  -----------------------------------------
2200          *     G     |    L  |    yes-v4 no-v6
2201          *  -----------------------------------------
2202          *     L     |    P  |    no
2203          *  -----------------------------------------
2204          *     P     |    P  |    yes
2205          *  -----------------------------------------
2206          *     G     |    P  |    no
2207          *   -----------------------------------------
2208          *     L     |    G  |    no
2209          *   -----------------------------------------
2210          *     P     |    G  |    no
2211          *    -----------------------------------------
2212          *     G     |    G  |    yes
2213          *    -----------------------------------------
2214          */
2215
2216         if (ifa->address.sa.sa_family != fam) {
2217                 /* forget mis-matched family */
2218                 return (NULL);
2219         }
2220         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2221                 dest_is_global = 1;
2222         }
2223         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2224         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2225         /* Ok the address may be ok */
2226         if (fam == AF_INET6) {
2227                 /* ok to use deprecated addresses? no lets not! */
2228                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2229                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2230                         return (NULL);
2231                 }
2232                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2233                         if (dest_is_loop) {
2234                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2235                                 return (NULL);
2236                         }
2237                 }
2238                 if (ifa->src_is_glob) {
2239                         if (dest_is_loop) {
2240                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2241                                 return (NULL);
2242                         }
2243                 }
2244         }
2245         /*
2246          * Now that we know what is what, implement or table this could in
2247          * theory be done slicker (it used to be), but this is
2248          * straightforward and easier to validate :-)
2249          */
2250         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2251             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2252         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2253             dest_is_loop, dest_is_priv, dest_is_global);
2254
2255         if ((ifa->src_is_loop) && (dest_is_priv)) {
2256                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2257                 return (NULL);
2258         }
2259         if ((ifa->src_is_glob) && (dest_is_priv)) {
2260                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2261                 return (NULL);
2262         }
2263         if ((ifa->src_is_loop) && (dest_is_global)) {
2264                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2265                 return (NULL);
2266         }
2267         if ((ifa->src_is_priv) && (dest_is_global)) {
2268                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2269                 return (NULL);
2270         }
2271         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2272         /* its a preferred address */
2273         return (ifa);
2274 }
2275
2276 static struct sctp_ifa *
2277 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2278     uint8_t dest_is_loop,
2279     uint8_t dest_is_priv,
2280     sa_family_t fam)
2281 {
2282         uint8_t dest_is_global = 0;
2283
2284         /*
2285          * Here we determine if its a acceptable address. A acceptable
2286          * address means it is the same scope or higher scope but we can
2287          * allow for NAT which means its ok to have a global dest and a
2288          * private src.
2289          *
2290          * L = loopback, P = private, G = global
2291          * ----------------------------------------- src    |  dest | result
2292          * ----------------------------------------- L     |   L   |    yes
2293          * ----------------------------------------- P     |   L   |
2294          * yes-v4 no-v6 ----------------------------------------- G     |
2295          * L   |    yes ----------------------------------------- L     |
2296          * P   |    no ----------------------------------------- P     |   P
2297          * |    yes ----------------------------------------- G     |   P
2298          * |    yes - May not work -----------------------------------------
2299          * L     |   G   |    no ----------------------------------------- P
2300          * |   G   |    yes - May not work
2301          * ----------------------------------------- G     |   G   |    yes
2302          * -----------------------------------------
2303          */
2304
2305         if (ifa->address.sa.sa_family != fam) {
2306                 /* forget non matching family */
2307                 return (NULL);
2308         }
2309         /* Ok the address may be ok */
2310         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2311                 dest_is_global = 1;
2312         }
2313         if (fam == AF_INET6) {
2314                 /* ok to use deprecated addresses? */
2315                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2316                         return (NULL);
2317                 }
2318                 if (ifa->src_is_priv) {
2319                         /* Special case, linklocal to loop */
2320                         if (dest_is_loop)
2321                                 return (NULL);
2322                 }
2323         }
2324         /*
2325          * Now that we know what is what, implement our table. This could in
2326          * theory be done slicker (it used to be), but this is
2327          * straightforward and easier to validate :-)
2328          */
2329         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2330                 return (NULL);
2331         }
2332         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2333                 return (NULL);
2334         }
2335         /* its an acceptable address */
2336         return (ifa);
2337 }
2338
2339 int
2340 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2341 {
2342         struct sctp_laddr *laddr;
2343
2344         if (stcb == NULL) {
2345                 /* There are no restrictions, no TCB :-) */
2346                 return (0);
2347         }
2348         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2349                 if (laddr->ifa == NULL) {
2350                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2351                             __FUNCTION__);
2352                         continue;
2353                 }
2354                 if (laddr->ifa == ifa) {
2355                         /* Yes it is on the list */
2356                         return (1);
2357                 }
2358         }
2359         return (0);
2360 }
2361
2362
2363 int
2364 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2365 {
2366         struct sctp_laddr *laddr;
2367
2368         if (ifa == NULL)
2369                 return (0);
2370         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2371                 if (laddr->ifa == NULL) {
2372                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2373                             __FUNCTION__);
2374                         continue;
2375                 }
2376                 if ((laddr->ifa == ifa) && laddr->action == 0)
2377                         /* same pointer */
2378                         return (1);
2379         }
2380         return (0);
2381 }
2382
2383
2384
2385 static struct sctp_ifa *
2386 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2387     sctp_route_t * ro,
2388     uint32_t vrf_id,
2389     int non_asoc_addr_ok,
2390     uint8_t dest_is_priv,
2391     uint8_t dest_is_loop,
2392     sa_family_t fam)
2393 {
2394         struct sctp_laddr *laddr, *starting_point;
2395         void *ifn;
2396         int resettotop = 0;
2397         struct sctp_ifn *sctp_ifn;
2398         struct sctp_ifa *sctp_ifa, *sifa;
2399         struct sctp_vrf *vrf;
2400         uint32_t ifn_index;
2401
2402         vrf = sctp_find_vrf(vrf_id);
2403         if (vrf == NULL)
2404                 return (NULL);
2405
2406         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2407         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2408         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2409         /*
2410          * first question, is the ifn we will emit on in our list, if so, we
2411          * want such an address. Note that we first looked for a preferred
2412          * address.
2413          */
2414         if (sctp_ifn) {
2415                 /* is a preferred one on the interface we route out? */
2416                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2417                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2418                             (non_asoc_addr_ok == 0))
2419                                 continue;
2420                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2421                             dest_is_loop,
2422                             dest_is_priv, fam);
2423                         if (sifa == NULL)
2424                                 continue;
2425                         if (sctp_is_addr_in_ep(inp, sifa)) {
2426                                 atomic_add_int(&sifa->refcount, 1);
2427                                 return (sifa);
2428                         }
2429                 }
2430         }
2431         /*
2432          * ok, now we now need to find one on the list of the addresses. We
2433          * can't get one on the emitting interface so let's find first a
2434          * preferred one. If not that an acceptable one otherwise... we
2435          * return NULL.
2436          */
2437         starting_point = inp->next_addr_touse;
2438 once_again:
2439         if (inp->next_addr_touse == NULL) {
2440                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2441                 resettotop = 1;
2442         }
2443         for (laddr = inp->next_addr_touse; laddr;
2444             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2445                 if (laddr->ifa == NULL) {
2446                         /* address has been removed */
2447                         continue;
2448                 }
2449                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2450                         /* address is being deleted */
2451                         continue;
2452                 }
2453                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2454                     dest_is_priv, fam);
2455                 if (sifa == NULL)
2456                         continue;
2457                 atomic_add_int(&sifa->refcount, 1);
2458                 return (sifa);
2459         }
2460         if (resettotop == 0) {
2461                 inp->next_addr_touse = NULL;
2462                 goto once_again;
2463         }
2464         inp->next_addr_touse = starting_point;
2465         resettotop = 0;
2466 once_again_too:
2467         if (inp->next_addr_touse == NULL) {
2468                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2469                 resettotop = 1;
2470         }
2471         /* ok, what about an acceptable address in the inp */
2472         for (laddr = inp->next_addr_touse; laddr;
2473             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2474                 if (laddr->ifa == NULL) {
2475                         /* address has been removed */
2476                         continue;
2477                 }
2478                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2479                         /* address is being deleted */
2480                         continue;
2481                 }
2482                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2483                     dest_is_priv, fam);
2484                 if (sifa == NULL)
2485                         continue;
2486                 atomic_add_int(&sifa->refcount, 1);
2487                 return (sifa);
2488         }
2489         if (resettotop == 0) {
2490                 inp->next_addr_touse = NULL;
2491                 goto once_again_too;
2492         }
2493         /*
2494          * no address bound can be a source for the destination we are in
2495          * trouble
2496          */
2497         return (NULL);
2498 }
2499
2500
2501
2502 static struct sctp_ifa *
2503 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2504     struct sctp_tcb *stcb,
2505     struct sctp_nets *net,
2506     sctp_route_t * ro,
2507     uint32_t vrf_id,
2508     uint8_t dest_is_priv,
2509     uint8_t dest_is_loop,
2510     int non_asoc_addr_ok,
2511     sa_family_t fam)
2512 {
2513         struct sctp_laddr *laddr, *starting_point;
2514         void *ifn;
2515         struct sctp_ifn *sctp_ifn;
2516         struct sctp_ifa *sctp_ifa, *sifa;
2517         uint8_t start_at_beginning = 0;
2518         struct sctp_vrf *vrf;
2519         uint32_t ifn_index;
2520
2521         /*
2522          * first question, is the ifn we will emit on in our list, if so, we
2523          * want that one.
2524          */
2525         vrf = sctp_find_vrf(vrf_id);
2526         if (vrf == NULL)
2527                 return (NULL);
2528
2529         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2530         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2531         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2532
2533         /*
2534          * first question, is the ifn we will emit on in our list?  If so,
2535          * we want that one. First we look for a preferred. Second, we go
2536          * for an acceptable.
2537          */
2538         if (sctp_ifn) {
2539                 /* first try for a preferred address on the ep */
2540                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2541                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2542                                 continue;
2543                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2544                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2545                                 if (sifa == NULL)
2546                                         continue;
2547                                 if (((non_asoc_addr_ok == 0) &&
2548                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2549                                     (non_asoc_addr_ok &&
2550                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2551                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2552                                         /* on the no-no list */
2553                                         continue;
2554                                 }
2555                                 atomic_add_int(&sifa->refcount, 1);
2556                                 return (sifa);
2557                         }
2558                 }
2559                 /* next try for an acceptable address on the ep */
2560                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2561                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2562                                 continue;
2563                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2564                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2565                                 if (sifa == NULL)
2566                                         continue;
2567                                 if (((non_asoc_addr_ok == 0) &&
2568                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2569                                     (non_asoc_addr_ok &&
2570                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2571                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2572                                         /* on the no-no list */
2573                                         continue;
2574                                 }
2575                                 atomic_add_int(&sifa->refcount, 1);
2576                                 return (sifa);
2577                         }
2578                 }
2579
2580         }
2581         /*
2582          * if we can't find one like that then we must look at all addresses
2583          * bound to pick one at first preferable then secondly acceptable.
2584          */
2585         starting_point = stcb->asoc.last_used_address;
2586 sctp_from_the_top:
2587         if (stcb->asoc.last_used_address == NULL) {
2588                 start_at_beginning = 1;
2589                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2590         }
2591         /* search beginning with the last used address */
2592         for (laddr = stcb->asoc.last_used_address; laddr;
2593             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2594                 if (laddr->ifa == NULL) {
2595                         /* address has been removed */
2596                         continue;
2597                 }
2598                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2599                         /* address is being deleted */
2600                         continue;
2601                 }
2602                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2603                 if (sifa == NULL)
2604                         continue;
2605                 if (((non_asoc_addr_ok == 0) &&
2606                     (sctp_is_addr_restricted(stcb, sifa))) ||
2607                     (non_asoc_addr_ok &&
2608                     (sctp_is_addr_restricted(stcb, sifa)) &&
2609                     (!sctp_is_addr_pending(stcb, sifa)))) {
2610                         /* on the no-no list */
2611                         continue;
2612                 }
2613                 stcb->asoc.last_used_address = laddr;
2614                 atomic_add_int(&sifa->refcount, 1);
2615                 return (sifa);
2616         }
2617         if (start_at_beginning == 0) {
2618                 stcb->asoc.last_used_address = NULL;
2619                 goto sctp_from_the_top;
2620         }
2621         /* now try for any higher scope than the destination */
2622         stcb->asoc.last_used_address = starting_point;
2623         start_at_beginning = 0;
2624 sctp_from_the_top2:
2625         if (stcb->asoc.last_used_address == NULL) {
2626                 start_at_beginning = 1;
2627                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2628         }
2629         /* search beginning with the last used address */
2630         for (laddr = stcb->asoc.last_used_address; laddr;
2631             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2632                 if (laddr->ifa == NULL) {
2633                         /* address has been removed */
2634                         continue;
2635                 }
2636                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2637                         /* address is being deleted */
2638                         continue;
2639                 }
2640                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2641                     dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top2;
2659         }
2660         return (NULL);
2661 }
2662
2663 static struct sctp_ifa *
2664 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2665     struct sctp_tcb *stcb,
2666     int non_asoc_addr_ok,
2667     uint8_t dest_is_loop,
2668     uint8_t dest_is_priv,
2669     int addr_wanted,
2670     sa_family_t fam,
2671     sctp_route_t * ro
2672 )
2673 {
2674         struct sctp_ifa *ifa, *sifa;
2675         int num_eligible_addr = 0;
2676
2677 #ifdef INET6
2678         struct sockaddr_in6 sin6, lsa6;
2679
2680         if (fam == AF_INET6) {
2681                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2682                 (void)sa6_recoverscope(&sin6);
2683         }
2684 #endif                          /* INET6 */
2685         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2686                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2687                     (non_asoc_addr_ok == 0))
2688                         continue;
2689                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2690                     dest_is_priv, fam);
2691                 if (sifa == NULL)
2692                         continue;
2693 #ifdef INET6
2694                 if (fam == AF_INET6 &&
2695                     dest_is_loop &&
2696                     sifa->src_is_loop && sifa->src_is_priv) {
2697                         /*
2698                          * don't allow fe80::1 to be a src on loop ::1, we
2699                          * don't list it to the peer so we will get an
2700                          * abort.
2701                          */
2702                         continue;
2703                 }
2704                 if (fam == AF_INET6 &&
2705                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2706                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2707                         /*
2708                          * link-local <-> link-local must belong to the same
2709                          * scope.
2710                          */
2711                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2712                         (void)sa6_recoverscope(&lsa6);
2713                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2714                                 continue;
2715                         }
2716                 }
2717 #endif                          /* INET6 */
2718
2719                 /*
2720                  * Check if the IPv6 address matches to next-hop. In the
2721                  * mobile case, old IPv6 address may be not deleted from the
2722                  * interface. Then, the interface has previous and new
2723                  * addresses.  We should use one corresponding to the
2724                  * next-hop.  (by micchie)
2725                  */
2726 #ifdef INET6
2727                 if (stcb && fam == AF_INET6 &&
2728                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2729                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2730                             == 0) {
2731                                 continue;
2732                         }
2733                 }
2734 #endif
2735                 /* Avoid topologically incorrect IPv4 address */
2736                 if (stcb && fam == AF_INET &&
2737                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2738                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2739                                 continue;
2740                         }
2741                 }
2742                 if (stcb) {
2743                         if (sctp_is_address_in_scope(ifa,
2744                             stcb->asoc.ipv4_addr_legal,
2745                             stcb->asoc.ipv6_addr_legal,
2746                             stcb->asoc.loopback_scope,
2747                             stcb->asoc.ipv4_local_scope,
2748                             stcb->asoc.local_scope,
2749                             stcb->asoc.site_scope, 0) == 0) {
2750                                 continue;
2751                         }
2752                         if (((non_asoc_addr_ok == 0) &&
2753                             (sctp_is_addr_restricted(stcb, sifa))) ||
2754                             (non_asoc_addr_ok &&
2755                             (sctp_is_addr_restricted(stcb, sifa)) &&
2756                             (!sctp_is_addr_pending(stcb, sifa)))) {
2757                                 /*
2758                                  * It is restricted for some reason..
2759                                  * probably not yet added.
2760                                  */
2761                                 continue;
2762                         }
2763                 }
2764                 if (num_eligible_addr >= addr_wanted) {
2765                         return (sifa);
2766                 }
2767                 num_eligible_addr++;
2768         }
2769         return (NULL);
2770 }
2771
2772
2773 static int
2774 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     sa_family_t fam)
2780 {
2781         struct sctp_ifa *ifa, *sifa;
2782         int num_eligible_addr = 0;
2783
2784         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2785                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2786                     (non_asoc_addr_ok == 0)) {
2787                         continue;
2788                 }
2789                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2790                     dest_is_priv, fam);
2791                 if (sifa == NULL) {
2792                         continue;
2793                 }
2794                 if (stcb) {
2795                         if (sctp_is_address_in_scope(ifa,
2796                             stcb->asoc.ipv4_addr_legal,
2797                             stcb->asoc.ipv6_addr_legal,
2798                             stcb->asoc.loopback_scope,
2799                             stcb->asoc.ipv4_local_scope,
2800                             stcb->asoc.local_scope,
2801                             stcb->asoc.site_scope, 0) == 0) {
2802                                 continue;
2803                         }
2804                         if (((non_asoc_addr_ok == 0) &&
2805                             (sctp_is_addr_restricted(stcb, sifa))) ||
2806                             (non_asoc_addr_ok &&
2807                             (sctp_is_addr_restricted(stcb, sifa)) &&
2808                             (!sctp_is_addr_pending(stcb, sifa)))) {
2809                                 /*
2810                                  * It is restricted for some reason..
2811                                  * probably not yet added.
2812                                  */
2813                                 continue;
2814                         }
2815                 }
2816                 num_eligible_addr++;
2817         }
2818         return (num_eligible_addr);
2819 }
2820
2821 static struct sctp_ifa *
2822 sctp_choose_boundall(struct sctp_inpcb *inp,
2823     struct sctp_tcb *stcb,
2824     struct sctp_nets *net,
2825     sctp_route_t * ro,
2826     uint32_t vrf_id,
2827     uint8_t dest_is_priv,
2828     uint8_t dest_is_loop,
2829     int non_asoc_addr_ok,
2830     sa_family_t fam)
2831 {
2832         int cur_addr_num = 0, num_preferred = 0;
2833         void *ifn;
2834         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2835         struct sctp_ifa *sctp_ifa, *sifa;
2836         uint32_t ifn_index;
2837         struct sctp_vrf *vrf;
2838
2839         /*-
2840          * For boundall we can use any address in the association.
2841          * If non_asoc_addr_ok is set we can use any address (at least in
2842          * theory). So we look for preferred addresses first. If we find one,
2843          * we use it. Otherwise we next try to get an address on the
2844          * interface, which we should be able to do (unless non_asoc_addr_ok
2845          * is false and we are routed out that way). In these cases where we
2846          * can't use the address of the interface we go through all the
2847          * ifn's looking for an address we can use and fill that in. Punting
2848          * means we send back address 0, which will probably cause problems
2849          * actually since then IP will fill in the address of the route ifn,
2850          * which means we probably already rejected it.. i.e. here comes an
2851          * abort :-<.
2852          */
2853         vrf = sctp_find_vrf(vrf_id);
2854         if (vrf == NULL)
2855                 return (NULL);
2856
2857         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2858         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2859         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2860         if (sctp_ifn == NULL) {
2861                 /* ?? We don't have this guy ?? */
2862                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2863                 goto bound_all_plan_b;
2864         }
2865         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2866             ifn_index, sctp_ifn->ifn_name);
2867
2868         if (net) {
2869                 cur_addr_num = net->indx_of_eligible_next_to_use;
2870         }
2871         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2872             stcb,
2873             non_asoc_addr_ok,
2874             dest_is_loop,
2875             dest_is_priv, fam);
2876         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2877             num_preferred, sctp_ifn->ifn_name);
2878         if (num_preferred == 0) {
2879                 /*
2880                  * no eligible addresses, we must use some other interface
2881                  * address if we can find one.
2882                  */
2883                 goto bound_all_plan_b;
2884         }
2885         /*
2886          * Ok we have num_eligible_addr set with how many we can use, this
2887          * may vary from call to call due to addresses being deprecated
2888          * etc..
2889          */
2890         if (cur_addr_num >= num_preferred) {
2891                 cur_addr_num = 0;
2892         }
2893         /*
2894          * select the nth address from the list (where cur_addr_num is the
2895          * nth) and 0 is the first one, 1 is the second one etc...
2896          */
2897         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2898
2899         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2900             dest_is_priv, cur_addr_num, fam, ro);
2901
2902         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2903         if (sctp_ifa) {
2904                 atomic_add_int(&sctp_ifa->refcount, 1);
2905                 if (net) {
2906                         /* save off where the next one we will want */
2907                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2908                 }
2909                 return (sctp_ifa);
2910         }
2911         /*
2912          * plan_b: Look at all interfaces and find a preferred address. If
2913          * no preferred fall through to plan_c.
2914          */
2915 bound_all_plan_b:
2916         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2917         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2918                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2919                     sctp_ifn->ifn_name);
2920                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2921                         /* wrong base scope */
2922                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2923                         continue;
2924                 }
2925                 if ((sctp_ifn == looked_at) && looked_at) {
2926                         /* already looked at this guy */
2927                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2928                         continue;
2929                 }
2930                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2931                     dest_is_loop, dest_is_priv, fam);
2932                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2933                     "Found ifn:%p %d preferred source addresses\n",
2934                     ifn, num_preferred);
2935                 if (num_preferred == 0) {
2936                         /* None on this interface. */
2937                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2938                         continue;
2939                 }
2940                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2941                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2942                     num_preferred, sctp_ifn, cur_addr_num);
2943
2944                 /*
2945                  * Ok we have num_eligible_addr set with how many we can
2946                  * use, this may vary from call to call due to addresses
2947                  * being deprecated etc..
2948                  */
2949                 if (cur_addr_num >= num_preferred) {
2950                         cur_addr_num = 0;
2951                 }
2952                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2953                     dest_is_priv, cur_addr_num, fam, ro);
2954                 if (sifa == NULL)
2955                         continue;
2956                 if (net) {
2957                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2958                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2959                             cur_addr_num);
2960                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2961                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2962                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2963                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2964                 }
2965                 atomic_add_int(&sifa->refcount, 1);
2966                 return (sifa);
2967
2968         }
2969
2970         /* plan_c: do we have an acceptable address on the emit interface */
2971         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2972         if (emit_ifn == NULL) {
2973                 goto plan_d;
2974         }
2975         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2976                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2977                     (non_asoc_addr_ok == 0))
2978                         continue;
2979                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2980                     dest_is_priv, fam);
2981                 if (sifa == NULL)
2982                         continue;
2983                 if (stcb) {
2984                         if (sctp_is_address_in_scope(sifa,
2985                             stcb->asoc.ipv4_addr_legal,
2986                             stcb->asoc.ipv6_addr_legal,
2987                             stcb->asoc.loopback_scope,
2988                             stcb->asoc.ipv4_local_scope,
2989                             stcb->asoc.local_scope,
2990                             stcb->asoc.site_scope, 0) == 0) {
2991                                 continue;
2992                         }
2993                         if (((non_asoc_addr_ok == 0) &&
2994                             (sctp_is_addr_restricted(stcb, sifa))) ||
2995                             (non_asoc_addr_ok &&
2996                             (sctp_is_addr_restricted(stcb, sifa)) &&
2997                             (!sctp_is_addr_pending(stcb, sifa)))) {
2998                                 /*
2999                                  * It is restricted for some reason..
3000                                  * probably not yet added.
3001                                  */
3002                                 continue;
3003                         }
3004                 }
3005                 atomic_add_int(&sifa->refcount, 1);
3006                 return (sifa);
3007         }
3008 plan_d:
3009         /*
3010          * plan_d: We are in trouble. No preferred address on the emit
3011          * interface. And not even a preferred address on all interfaces. Go
3012          * out and see if we can find an acceptable address somewhere
3013          * amongst all interfaces.
3014          */
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
3016         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3017                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3018                         /* wrong base scope */
3019                         continue;
3020                 }
3021                 if ((sctp_ifn == looked_at) && looked_at)
3022                         /* already looked at this guy */
3023                         continue;
3024
3025                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3026                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                             (non_asoc_addr_ok == 0))
3028                                 continue;
3029                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3030                             dest_is_loop,
3031                             dest_is_priv, fam);
3032                         if (sifa == NULL)
3033                                 continue;
3034                         if (stcb) {
3035                                 if (sctp_is_address_in_scope(sifa,
3036                                     stcb->asoc.ipv4_addr_legal,
3037                                     stcb->asoc.ipv6_addr_legal,
3038                                     stcb->asoc.loopback_scope,
3039                                     stcb->asoc.ipv4_local_scope,
3040                                     stcb->asoc.local_scope,
3041                                     stcb->asoc.site_scope, 0) == 0) {
3042                                         continue;
3043                                 }
3044                                 if (((non_asoc_addr_ok == 0) &&
3045                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3046                                     (non_asoc_addr_ok &&
3047                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3048                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3049                                         /*
3050                                          * It is restricted for some
3051                                          * reason.. probably not yet added.
3052                                          */
3053                                         continue;
3054                                 }
3055                         }
3056                         atomic_add_int(&sifa->refcount, 1);
3057                         return (sifa);
3058                 }
3059         }
3060         /*
3061          * Ok we can find NO address to source from that is not on our
3062          * restricted list and non_asoc_address is NOT ok, or it is on our
3063          * restricted list. We can't source to it :-(
3064          */
3065         return (NULL);
3066 }
3067
3068
3069
3070 /* tcb may be NULL */
3071 struct sctp_ifa *
3072 sctp_source_address_selection(struct sctp_inpcb *inp,
3073     struct sctp_tcb *stcb,
3074     sctp_route_t * ro,
3075     struct sctp_nets *net,
3076     int non_asoc_addr_ok, uint32_t vrf_id)
3077 {
3078         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3079
3080 #ifdef INET6
3081         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3082
3083 #endif
3084         struct sctp_ifa *answer;
3085         uint8_t dest_is_priv, dest_is_loop;
3086         sa_family_t fam;
3087
3088         /*-
3089          * Rules: - Find the route if needed, cache if I can. - Look at
3090          * interface address in route, Is it in the bound list. If so we
3091          * have the best source. - If not we must rotate amongst the
3092          * addresses.
3093          *
3094          * Cavets and issues
3095          *
3096          * Do we need to pay attention to scope. We can have a private address
3097          * or a global address we are sourcing or sending to. So if we draw
3098          * it out
3099          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3100          * For V4
3101          * ------------------------------------------
3102          *      source     *      dest  *  result
3103          * -----------------------------------------
3104          * <a>  Private    *    Global  *  NAT
3105          * -----------------------------------------
3106          * <b>  Private    *    Private *  No problem
3107          * -----------------------------------------
3108          * <c>  Global     *    Private *  Huh, How will this work?
3109          * -----------------------------------------
3110          * <d>  Global     *    Global  *  No Problem
3111          *------------------------------------------
3112          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3113          * For V6
3114          *------------------------------------------
3115          *      source     *      dest  *  result
3116          * -----------------------------------------
3117          * <a>  Linklocal  *    Global  *
3118          * -----------------------------------------
3119          * <b>  Linklocal  * Linklocal  *  No problem
3120          * -----------------------------------------
3121          * <c>  Global     * Linklocal  *  Huh, How will this work?
3122          * -----------------------------------------
3123          * <d>  Global     *    Global  *  No Problem
3124          *------------------------------------------
3125          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3126          *
3127          * And then we add to that what happens if there are multiple addresses
3128          * assigned to an interface. Remember the ifa on a ifn is a linked
3129          * list of addresses. So one interface can have more than one IP
3130          * address. What happens if we have both a private and a global
3131          * address? Do we then use context of destination to sort out which
3132          * one is best? And what about NAT's sending P->G may get you a NAT
3133          * translation, or should you select the G thats on the interface in
3134          * preference.
3135          *
3136          * Decisions:
3137          *
3138          * - count the number of addresses on the interface.
3139          * - if it is one, no problem except case <c>.
3140          *   For <a> we will assume a NAT out there.
3141          * - if there are more than one, then we need to worry about scope P
3142          *   or G. We should prefer G -> G and P -> P if possible.
3143          *   Then as a secondary fall back to mixed types G->P being a last
3144          *   ditch one.
3145          * - The above all works for bound all, but bound specific we need to
3146          *   use the same concept but instead only consider the bound
3147          *   addresses. If the bound set is NOT assigned to the interface then
3148          *   we must use rotation amongst the bound addresses..
3149          */
3150         if (ro->ro_rt == NULL) {
3151                 /*
3152                  * Need a route to cache.
3153                  */
3154                 SCTP_RTALLOC(ro, vrf_id);
3155         }
3156         if (ro->ro_rt == NULL) {
3157                 return (NULL);
3158         }
3159         fam = to->sin_family;
3160         dest_is_priv = dest_is_loop = 0;
3161         /* Setup our scopes for the destination */
3162         switch (fam) {
3163         case AF_INET:
3164                 /* Scope based on outbound address */
3165                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3166                         dest_is_loop = 1;
3167                         if (net != NULL) {
3168                                 /* mark it as local */
3169                                 net->addr_is_local = 1;
3170                         }
3171                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3172                         dest_is_priv = 1;
3173                 }
3174                 break;
3175 #ifdef INET6
3176         case AF_INET6:
3177                 /* Scope based on outbound address */
3178                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3179                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3180                         /*
3181                          * If the address is a loopback address, which
3182                          * consists of "::1" OR "fe80::1%lo0", we are
3183                          * loopback scope. But we don't use dest_is_priv
3184                          * (link local addresses).
3185                          */
3186                         dest_is_loop = 1;
3187                         if (net != NULL) {
3188                                 /* mark it as local */
3189                                 net->addr_is_local = 1;
3190                         }
3191                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3192                         dest_is_priv = 1;
3193                 }
3194                 break;
3195 #endif
3196         }
3197         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3198         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3199         SCTP_IPI_ADDR_RLOCK();
3200         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3201                 /*
3202                  * Bound all case
3203                  */
3204                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3205                     dest_is_priv, dest_is_loop,
3206                     non_asoc_addr_ok, fam);
3207                 SCTP_IPI_ADDR_RUNLOCK();
3208                 return (answer);
3209         }
3210         /*
3211          * Subset bound case
3212          */
3213         if (stcb) {
3214                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3215                     vrf_id, dest_is_priv,
3216                     dest_is_loop,
3217                     non_asoc_addr_ok, fam);
3218         } else {
3219                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3220                     non_asoc_addr_ok,
3221                     dest_is_priv,
3222                     dest_is_loop, fam);
3223         }
3224         SCTP_IPI_ADDR_RUNLOCK();
3225         return (answer);
3226 }
3227
3228 static int
3229 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3230 {
3231         struct cmsghdr cmh;
3232         int tlen, at;
3233
3234         tlen = SCTP_BUF_LEN(control);
3235         at = 0;
3236         /*
3237          * Independent of how many mbufs, find the c_type inside the control
3238          * structure and copy out the data.
3239          */
3240         while (at < tlen) {
3241                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3242                         /* not enough room for one more we are done. */
3243                         return (0);
3244                 }
3245                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3246                 if (((int)cmh.cmsg_len + at) > tlen) {
3247                         /*
3248                          * this is real messed up since there is not enough
3249                          * data here to cover the cmsg header. We are done.
3250                          */
3251                         return (0);
3252                 }
3253                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3254                     (c_type == cmh.cmsg_type)) {
3255                         /* found the one we want, copy it out */
3256                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3257                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3258                                 /*
3259                                  * space of cmsg_len after header not big
3260                                  * enough
3261                                  */
3262                                 return (0);
3263                         }
3264                         m_copydata(control, at, cpsize, data);
3265                         return (1);
3266                 } else {
3267                         at += CMSG_ALIGN(cmh.cmsg_len);
3268                         if (cmh.cmsg_len == 0) {
3269                                 break;
3270                         }
3271                 }
3272         }
3273         /* not found */
3274         return (0);
3275 }
3276
3277 static struct mbuf *
3278 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3279     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3280 {
3281         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3282         struct sctp_state_cookie *stc;
3283         struct sctp_paramhdr *ph;
3284         uint8_t *foo;
3285         int sig_offset;
3286         uint16_t cookie_sz;
3287
3288         mret = NULL;
3289         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3290             sizeof(struct sctp_paramhdr)), 0,
3291             M_DONTWAIT, 1, MT_DATA);
3292         if (mret == NULL) {
3293                 return (NULL);
3294         }
3295         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3296         if (copy_init == NULL) {
3297                 sctp_m_freem(mret);
3298                 return (NULL);
3299         }
3300 #ifdef SCTP_MBUF_LOGGING
3301         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3302                 struct mbuf *mat;
3303
3304                 mat = copy_init;
3305                 while (mat) {
3306                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3307                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3308                         }
3309                         mat = SCTP_BUF_NEXT(mat);
3310                 }
3311         }
3312 #endif
3313         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3314             M_DONTWAIT);
3315         if (copy_initack == NULL) {
3316                 sctp_m_freem(mret);
3317                 sctp_m_freem(copy_init);
3318                 return (NULL);
3319         }
3320 #ifdef SCTP_MBUF_LOGGING
3321         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3322                 struct mbuf *mat;
3323
3324                 mat = copy_initack;
3325                 while (mat) {
3326                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3327                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3328                         }
3329                         mat = SCTP_BUF_NEXT(mat);
3330                 }
3331         }
3332 #endif
3333         /* easy side we just drop it on the end */
3334         ph = mtod(mret, struct sctp_paramhdr *);
3335         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3336             sizeof(struct sctp_paramhdr);
3337         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3338             sizeof(struct sctp_paramhdr));
3339         ph->param_type = htons(SCTP_STATE_COOKIE);
3340         ph->param_length = 0;   /* fill in at the end */
3341         /* Fill in the stc cookie data */
3342         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3343
3344         /* tack the INIT and then the INIT-ACK onto the chain */
3345         cookie_sz = 0;
3346         m_at = mret;
3347         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3348                 cookie_sz += SCTP_BUF_LEN(m_at);
3349                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3350                         SCTP_BUF_NEXT(m_at) = copy_init;
3351                         break;
3352                 }
3353         }
3354
3355         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3356                 cookie_sz += SCTP_BUF_LEN(m_at);
3357                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3358                         SCTP_BUF_NEXT(m_at) = copy_initack;
3359                         break;
3360                 }
3361         }
3362
3363         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3364                 cookie_sz += SCTP_BUF_LEN(m_at);
3365                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3366                         break;
3367                 }
3368         }
3369         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3370         if (sig == NULL) {
3371                 /* no space, so free the entire chain */
3372                 sctp_m_freem(mret);
3373                 return (NULL);
3374         }
3375         SCTP_BUF_LEN(sig) = 0;
3376         SCTP_BUF_NEXT(m_at) = sig;
3377         sig_offset = 0;
3378         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3379         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3380         *signature = foo;
3381         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3382         cookie_sz += SCTP_SIGNATURE_SIZE;
3383         ph->param_length = htons(cookie_sz);
3384         return (mret);
3385 }
3386
3387
3388 static uint8_t
3389 sctp_get_ect(struct sctp_tcb *stcb,
3390     struct sctp_tmit_chunk *chk)
3391 {
3392         uint8_t this_random;
3393
3394         /* Huh? */
3395         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3396                 return (0);
3397
3398         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
3399                 /* no nonce, always return ECT0 */
3400                 return (SCTP_ECT0_BIT);
3401
3402         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3403                 /* Peer does NOT support it, so we send a ECT0 only */
3404                 return (SCTP_ECT0_BIT);
3405         }
3406         if (chk == NULL)
3407                 return (SCTP_ECT0_BIT);
3408
3409         if ((stcb->asoc.hb_random_idx > 3) ||
3410             ((stcb->asoc.hb_random_idx == 3) &&
3411             (stcb->asoc.hb_ect_randombit > 7))) {
3412                 uint32_t rndval;
3413
3414 warp_drive_sa:
3415                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3416                 memcpy(stcb->asoc.hb_random_values, &rndval,
3417                     sizeof(stcb->asoc.hb_random_values));
3418                 this_random = stcb->asoc.hb_random_values[0];
3419                 stcb->asoc.hb_random_idx = 0;
3420                 stcb->asoc.hb_ect_randombit = 0;
3421         } else {
3422                 if (stcb->asoc.hb_ect_randombit > 7) {
3423                         stcb->asoc.hb_ect_randombit = 0;
3424                         stcb->asoc.hb_random_idx++;
3425                         if (stcb->asoc.hb_random_idx > 3) {
3426                                 goto warp_drive_sa;
3427                         }
3428                 }
3429                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3430         }
3431         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3432                 if (chk != NULL)
3433                         /* ECN Nonce stuff */
3434                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3435                 stcb->asoc.hb_ect_randombit++;
3436                 return (SCTP_ECT1_BIT);
3437         } else {
3438                 stcb->asoc.hb_ect_randombit++;
3439                 return (SCTP_ECT0_BIT);
3440         }
3441 }
3442
3443 static int
3444 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3445     struct sctp_tcb *stcb,      /* may be NULL */
3446     struct sctp_nets *net,
3447     struct sockaddr *to,
3448     struct mbuf *m,
3449     uint32_t auth_offset,
3450     struct sctp_auth_chunk *auth,
3451     uint16_t auth_keyid,
3452     int nofragment_flag,
3453     int ecn_ok,
3454     struct sctp_tmit_chunk *chk,
3455     int out_of_asoc_ok,
3456     uint16_t src_port,
3457     uint16_t dest_port,
3458     uint32_t v_tag,
3459     uint16_t port,
3460     int so_locked,
3461 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3462     SCTP_UNUSED
3463 #endif
3464     union sctp_sockstore *over_addr
3465 )
3466 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3467 {
3468         /*
3469          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3470          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3471          * structure: - fill in the HMAC digest of any AUTH chunk in the
3472          * packet. - calculate and fill in the SCTP checksum. - prepend an
3473          * IP address header. - if boundall use INADDR_ANY. - if
3474          * boundspecific do source address selection. - set fragmentation
3475          * option for ipV4. - On return from IP output, check/adjust mtu
3476          * size of output interface and smallest_mtu size as well.
3477          */
3478         /* Will need ifdefs around this */
3479         struct mbuf *o_pak;
3480         struct mbuf *newm;
3481         struct sctphdr *sctphdr;
3482         int packet_length;
3483         int ret;
3484         uint32_t vrf_id;
3485         sctp_route_t *ro = NULL;
3486         struct udphdr *udp = NULL;
3487
3488 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3489         struct socket *so = NULL;
3490
3491 #endif
3492
3493         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3494                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3495                 sctp_m_freem(m);
3496                 return (EFAULT);
3497         }
3498         if (stcb) {
3499                 vrf_id = stcb->asoc.vrf_id;
3500         } else {
3501                 vrf_id = inp->def_vrf_id;
3502         }
3503
3504         /* fill in the HMAC digest for any AUTH chunk in the packet */
3505         if ((auth != NULL) && (stcb != NULL)) {
3506                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3507         }
3508         if (to->sa_family == AF_INET) {
3509                 struct ip *ip = NULL;
3510                 sctp_route_t iproute;
3511                 uint8_t tos_value;
3512                 int len;
3513
3514                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3515                 if (port) {
3516                         len += sizeof(struct udphdr);
3517                 }
3518                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3519                 if (newm == NULL) {
3520                         sctp_m_freem(m);
3521                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3522                         return (ENOMEM);
3523                 }
3524                 SCTP_ALIGN_TO_END(newm, len);
3525                 SCTP_BUF_LEN(newm) = len;
3526                 SCTP_BUF_NEXT(newm) = m;
3527                 m = newm;
3528                 packet_length = sctp_calculate_len(m);
3529                 ip = mtod(m, struct ip *);
3530                 ip->ip_v = IPVERSION;
3531                 ip->ip_hl = (sizeof(struct ip) >> 2);
3532                 if (net) {
3533                         tos_value = net->tos_flowlabel & 0x000000ff;
3534                 } else {
3535                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3536                 }
3537                 if ((nofragment_flag) && (port == 0)) {
3538                         ip->ip_off = IP_DF;
3539                 } else
3540                         ip->ip_off = 0;
3541
3542                 /* FreeBSD has a function for ip_id's */
3543                 ip->ip_id = ip_newid();
3544
3545                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3546                 ip->ip_len = packet_length;
3547                 if (stcb) {
3548                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3549                                 /* Enable ECN */
3550                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3551                         } else {
3552                                 /* No ECN */
3553                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3554                         }
3555                 } else {
3556                         /* no association at all */
3557                         ip->ip_tos = (tos_value & 0xfc);
3558                 }
3559                 if (port) {
3560                         ip->ip_p = IPPROTO_UDP;
3561                 } else {
3562                         ip->ip_p = IPPROTO_SCTP;
3563                 }
3564                 ip->ip_sum = 0;
3565                 if (net == NULL) {
3566                         ro = &iproute;
3567                         memset(&iproute, 0, sizeof(iproute));
3568                         memcpy(&ro->ro_dst, to, to->sa_len);
3569                 } else {
3570                         ro = (sctp_route_t *) & net->ro;
3571                 }
3572                 /* Now the address selection part */
3573                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3574
3575                 /* call the routine to select the src address */
3576                 if (net && out_of_asoc_ok == 0) {
3577                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3578                                 sctp_free_ifa(net->ro._s_addr);
3579                                 net->ro._s_addr = NULL;
3580                                 net->src_addr_selected = 0;
3581                                 if (ro->ro_rt) {
3582                                         RTFREE(ro->ro_rt);
3583                                         ro->ro_rt = NULL;
3584                                 }
3585                         }
3586                         if (net->src_addr_selected == 0) {
3587                                 /* Cache the source address */
3588                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3589                                     ro, net, 0,
3590                                     vrf_id);
3591                                 net->src_addr_selected = 1;
3592                         }
3593                         if (net->ro._s_addr == NULL) {
3594                                 /* No route to host */
3595                                 net->src_addr_selected = 0;
3596                                 goto no_route;
3597                         }
3598                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3599                 } else {
3600                         if (over_addr == NULL) {
3601                                 struct sctp_ifa *_lsrc;
3602
3603                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3604                                     net,
3605                                     out_of_asoc_ok,
3606                                     vrf_id);
3607                                 if (_lsrc == NULL) {
3608                                         goto no_route;
3609                                 }
3610                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3611                                 sctp_free_ifa(_lsrc);
3612                         } else {
3613                                 ip->ip_src = over_addr->sin.sin_addr;
3614                                 SCTP_RTALLOC(ro, vrf_id);
3615                         }
3616                 }
3617                 if (port) {
3618                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3619                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3620                         udp->uh_dport = port;
3621                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3622                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3623                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3624                 } else {
3625                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3626                 }
3627
3628                 sctphdr->src_port = src_port;
3629                 sctphdr->dest_port = dest_port;
3630                 sctphdr->v_tag = v_tag;
3631                 sctphdr->checksum = 0;
3632
3633                 /*
3634                  * If source address selection fails and we find no route
3635                  * then the ip_output should fail as well with a
3636                  * NO_ROUTE_TO_HOST type error. We probably should catch
3637                  * that somewhere and abort the association right away
3638                  * (assuming this is an INIT being sent).
3639                  */
3640                 if ((ro->ro_rt == NULL)) {
3641                         /*
3642                          * src addr selection failed to find a route (or
3643                          * valid source addr), so we can't get there from
3644                          * here (yet)!
3645                          */
3646         no_route:
3647                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3648                             "%s: dropped packet - no valid source addr\n",
3649                             __FUNCTION__);
3650                         if (net) {
3651                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3652                                     "Destination was ");
3653                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3654                                     &net->ro._l_addr.sa);
3655                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3656                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3657                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3658                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3659                                                     stcb,
3660                                                     SCTP_FAILED_THRESHOLD,
3661                                                     (void *)net,
3662                                                     so_locked);
3663                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3664                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3665                                                 /*
3666                                                  * JRS 5/14/07 - If a
3667                                                  * destination is
3668                                                  * unreachable, the PF bit
3669                                                  * is turned off.  This
3670                                                  * allows an unambiguous use
3671                                                  * of the PF bit for
3672                                                  * destinations that are
3673                                                  * reachable but potentially
3674                                                  * failed. If the
3675                                                  * destination is set to the
3676                                                  * unreachable state, also
3677                                                  * set the destination to
3678                                                  * the PF state.
3679                                                  */
3680                                                 /*
3681                                                  * Add debug message here if
3682                                                  * destination is not in PF
3683                                                  * state.
3684                                                  */
3685                                                 /*
3686                                                  * Stop any running T3
3687                                                  * timers here?
3688                                                  */
3689                                                 if ((stcb->asoc.sctp_cmt_on_off == 1) &&
3690                                                     (stcb->asoc.sctp_cmt_pf > 0)) {
3691                                                         net->dest_state &= ~SCTP_ADDR_PF;
3692                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3693                                                             net);
3694                                                 }
3695                                         }
3696                                 }
3697                                 if (stcb) {
3698                                         if (net == stcb->asoc.primary_destination) {
3699                                                 /* need a new primary */
3700                                                 struct sctp_nets *alt;
3701
3702                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3703                                                 if (alt != net) {
3704                                                         if (sctp_set_primary_addr(stcb,
3705                                                             (struct sockaddr *)NULL,
3706                                                             alt) == 0) {
3707                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3708                                                                 if (net->ro._s_addr) {
3709                                                                         sctp_free_ifa(net->ro._s_addr);
3710                                                                         net->ro._s_addr = NULL;
3711                                                                 }
3712                                                                 net->src_addr_selected = 0;
3713                                                         }
3714                                                 }
3715                                         }
3716                                 }
3717                         }
3718                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3719                         sctp_m_freem(m);
3720                         return (EHOSTUNREACH);
3721                 }
3722                 if (ro != &iproute) {
3723                         memcpy(&iproute, ro, sizeof(*ro));
3724                 }
3725                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3726                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3727                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3728                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3729                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3730                     ro->ro_rt);
3731
3732                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3733                         /* failed to prepend data, give up */
3734                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3735                         sctp_m_freem(m);
3736                         return (ENOMEM);
3737                 }
3738 #ifdef  SCTP_PACKET_LOGGING
3739                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3740                         sctp_packet_log(m, packet_length);
3741 #endif
3742                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3743                 if (port) {
3744 #if defined(SCTP_WITH_NO_CSUM)
3745                         SCTP_STAT_INCR(sctps_sendnocrc);
3746 #else
3747                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3748                             (stcb) &&
3749                             (stcb->asoc.loopback_scope))) {
3750                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3751                                 SCTP_STAT_INCR(sctps_sendswcrc);
3752                         } else {
3753                                 SCTP_STAT_INCR(sctps_sendnocrc);
3754                         }
3755 #endif
3756                         SCTP_ENABLE_UDP_CSUM(o_pak);
3757                 } else {
3758 #if defined(SCTP_WITH_NO_CSUM)
3759                         SCTP_STAT_INCR(sctps_sendnocrc);
3760 #else
3761                         m->m_pkthdr.csum_flags = CSUM_SCTP;
3762                         m->m_pkthdr.csum_data = 0;
3763                         SCTP_STAT_INCR(sctps_sendhwcrc);
3764 #endif
3765                 }
3766                 /* send it out.  table id is taken from stcb */
3767 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3768                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3769                         so = SCTP_INP_SO(inp);
3770                         SCTP_SOCKET_UNLOCK(so, 0);
3771                 }
3772 #endif
3773                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3774 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3775                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3776                         atomic_add_int(&stcb->asoc.refcnt, 1);
3777                         SCTP_TCB_UNLOCK(stcb);
3778                         SCTP_SOCKET_LOCK(so, 0);
3779                         SCTP_TCB_LOCK(stcb);
3780                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3781                 }
3782 #endif
3783                 SCTP_STAT_INCR(sctps_sendpackets);
3784                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3785                 if (ret)
3786                         SCTP_STAT_INCR(sctps_senderrors);
3787
3788                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3789                 if (net == NULL) {
3790                         /* free tempy routes */
3791                         if (ro->ro_rt) {
3792                                 RTFREE(ro->ro_rt);
3793                                 ro->ro_rt = NULL;
3794                         }
3795                 } else {
3796                         /* PMTU check versus smallest asoc MTU goes here */
3797                         if ((ro->ro_rt != NULL) &&
3798                             (net->ro._s_addr)) {
3799                                 uint32_t mtu;
3800
3801                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3802                                 if (net->port) {
3803                                         mtu -= sizeof(struct udphdr);
3804                                 }
3805                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3806 #ifdef SCTP_PRINT_FOR_B_AND_M
3807                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n", mtu);
3808 #endif
3809                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3810                                         net->mtu = mtu;
3811                                 }
3812                         } else if (ro->ro_rt == NULL) {
3813                                 /* route was freed */
3814                                 if (net->ro._s_addr &&
3815                                     net->src_addr_selected) {
3816                                         sctp_free_ifa(net->ro._s_addr);
3817                                         net->ro._s_addr = NULL;
3818                                 }
3819                                 net->src_addr_selected = 0;
3820                         }
3821                 }
3822                 return (ret);
3823         }
3824 #ifdef INET6
3825         else if (to->sa_family == AF_INET6) {
3826                 uint32_t flowlabel;
3827                 struct ip6_hdr *ip6h;
3828                 struct route_in6 ip6route;
3829                 struct ifnet *ifp;
3830                 u_char flowTop;
3831                 uint16_t flowBottom;
3832                 u_char tosBottom, tosTop;
3833                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3834                 int prev_scope = 0;
3835                 struct sockaddr_in6 lsa6_storage;
3836                 int error;
3837                 u_short prev_port = 0;
3838                 int len;
3839
3840                 if (net != NULL) {
3841                         flowlabel = net->tos_flowlabel;
3842                 } else {
3843                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3844                 }
3845
3846                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3847                 if (port) {
3848                         len += sizeof(struct udphdr);
3849                 }
3850                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3851                 if (newm == NULL) {
3852                         sctp_m_freem(m);
3853                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3854                         return (ENOMEM);
3855                 }
3856                 SCTP_ALIGN_TO_END(newm, len);
3857                 SCTP_BUF_LEN(newm) = len;
3858                 SCTP_BUF_NEXT(newm) = m;
3859                 m = newm;
3860                 packet_length = sctp_calculate_len(m);
3861
3862                 ip6h = mtod(m, struct ip6_hdr *);
3863                 /*
3864                  * We assume here that inp_flow is in host byte order within
3865                  * the TCB!
3866                  */
3867                 flowBottom = flowlabel & 0x0000ffff;
3868                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3869                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3870                 /* protect *sin6 from overwrite */
3871                 sin6 = (struct sockaddr_in6 *)to;
3872                 tmp = *sin6;
3873                 sin6 = &tmp;
3874
3875                 /* KAME hack: embed scopeid */
3876                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3877                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3878                         return (EINVAL);
3879                 }
3880                 if (net == NULL) {
3881                         memset(&ip6route, 0, sizeof(ip6route));
3882                         ro = (sctp_route_t *) & ip6route;
3883                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3884                 } else {
3885                         ro = (sctp_route_t *) & net->ro;
3886                 }
3887                 if (stcb != NULL) {
3888                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3889                                 /* Enable ECN */
3890                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3891                         } else {
3892                                 /* No ECN */
3893                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3894                         }
3895                 } else {
3896                         /* we could get no asoc if it is a O-O-T-B packet */
3897                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3898                 }
3899                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3900                 if (port) {
3901                         ip6h->ip6_nxt = IPPROTO_UDP;
3902                 } else {
3903                         ip6h->ip6_nxt = IPPROTO_SCTP;
3904                 }
3905                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3906                 ip6h->ip6_dst = sin6->sin6_addr;
3907
3908                 /*
3909                  * Add SRC address selection here: we can only reuse to a
3910                  * limited degree the kame src-addr-sel, since we can try
3911                  * their selection but it may not be bound.
3912                  */
3913                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3914                 lsa6_tmp.sin6_family = AF_INET6;
3915                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3916                 lsa6 = &lsa6_tmp;
3917                 if (net && out_of_asoc_ok == 0) {
3918                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3919                                 sctp_free_ifa(net->ro._s_addr);
3920                                 net->ro._s_addr = NULL;
3921                                 net->src_addr_selected = 0;
3922                                 if (ro->ro_rt) {
3923                                         RTFREE(ro->ro_rt);
3924                                         ro->ro_rt = NULL;
3925                                 }
3926                         }
3927                         if (net->src_addr_selected == 0) {
3928                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3929                                 /* KAME hack: embed scopeid */
3930                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3931                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3932                                         return (EINVAL);
3933                                 }
3934                                 /* Cache the source address */
3935                                 net->ro._s_addr = sctp_source_address_selection(inp,
3936                                     stcb,
3937                                     ro,
3938                                     net,
3939                                     0,
3940                                     vrf_id);
3941                                 (void)sa6_recoverscope(sin6);
3942                                 net->src_addr_selected = 1;
3943                         }
3944                         if (net->ro._s_addr == NULL) {
3945                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3946                                 net->src_addr_selected = 0;
3947                                 goto no_route;
3948                         }
3949                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3950                 } else {
3951                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3952                         /* KAME hack: embed scopeid */
3953                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3954                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3955                                 return (EINVAL);
3956                         }
3957                         if (over_addr == NULL) {
3958                                 struct sctp_ifa *_lsrc;
3959
3960                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3961                                     net,
3962                                     out_of_asoc_ok,
3963                                     vrf_id);
3964                                 if (_lsrc == NULL) {
3965                                         goto no_route;
3966                                 }
3967                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3968                                 sctp_free_ifa(_lsrc);
3969                         } else {
3970                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3971                                 SCTP_RTALLOC(ro, vrf_id);
3972                         }
3973                         (void)sa6_recoverscope(sin6);
3974                 }
3975                 lsa6->sin6_port = inp->sctp_lport;
3976
3977                 if (ro->ro_rt == NULL) {
3978                         /*
3979                          * src addr selection failed to find a route (or
3980                          * valid source addr), so we can't get there from
3981                          * here!
3982                          */
3983                         goto no_route;
3984                 }
3985                 /*
3986                  * XXX: sa6 may not have a valid sin6_scope_id in the
3987                  * non-SCOPEDROUTING case.
3988                  */
3989                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3990                 lsa6_storage.sin6_family = AF_INET6;
3991                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3992                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3993                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3994                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3995                         sctp_m_freem(m);
3996                         return (error);
3997                 }
3998                 /* XXX */
3999                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
4000                 lsa6_storage.sin6_port = inp->sctp_lport;
4001                 lsa6 = &lsa6_storage;
4002                 ip6h->ip6_src = lsa6->sin6_addr;
4003
4004                 if (port) {
4005                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4006                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4007                         udp->uh_dport = port;
4008                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4009                         udp->uh_sum = 0;
4010                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4011                 } else {
4012                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4013                 }
4014
4015                 sctphdr->src_port = src_port;
4016                 sctphdr->dest_port = dest_port;
4017                 sctphdr->v_tag = v_tag;
4018                 sctphdr->checksum = 0;
4019
4020                 /*
4021                  * We set the hop limit now since there is a good chance
4022                  * that our ro pointer is now filled
4023                  */
4024                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4025                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4026
4027 #ifdef SCTP_DEBUG
4028                 /* Copy to be sure something bad is not happening */
4029                 sin6->sin6_addr = ip6h->ip6_dst;
4030                 lsa6->sin6_addr = ip6h->ip6_src;
4031 #endif
4032
4033                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4034                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4035                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4036                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4037                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4038                 if (net) {
4039                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4040                         /* preserve the port and scope for link local send */
4041                         prev_scope = sin6->sin6_scope_id;
4042                         prev_port = sin6->sin6_port;
4043                 }
4044                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4045                         /* failed to prepend data, give up */
4046                         sctp_m_freem(m);
4047                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4048                         return (ENOMEM);
4049                 }
4050 #ifdef  SCTP_PACKET_LOGGING
4051                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4052                         sctp_packet_log(m, packet_length);
4053 #endif
4054                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4055                 if (port) {
4056 #if defined(SCTP_WITH_NO_CSUM)
4057                         SCTP_STAT_INCR(sctps_sendnocrc);
4058 #else
4059                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4060                             (stcb) &&
4061                             (stcb->asoc.loopback_scope))) {
4062                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4063                                 SCTP_STAT_INCR(sctps_sendswcrc);
4064                         } else {
4065                                 SCTP_STAT_INCR(sctps_sendnocrc);
4066                         }
4067 #endif
4068                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4069                                 udp->uh_sum = 0xffff;
4070                         }
4071                 } else {
4072 #if defined(SCTP_WITH_NO_CSUM)
4073                         SCTP_STAT_INCR(sctps_sendnocrc);
4074 #else
4075                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4076                             (stcb) &&
4077                             (stcb->asoc.loopback_scope))) {
4078                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4079                                 m->m_pkthdr.csum_data = 0;
4080                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4081                         } else {
4082                                 SCTP_STAT_INCR(sctps_sendnocrc);
4083                         }
4084 #endif
4085                 }
4086                 /* send it out. table id is taken from stcb */
4087 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4088                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4089                         so = SCTP_INP_SO(inp);
4090                         SCTP_SOCKET_UNLOCK(so, 0);
4091                 }
4092 #endif
4093                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4094 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4095                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4096                         atomic_add_int(&stcb->asoc.refcnt, 1);
4097                         SCTP_TCB_UNLOCK(stcb);
4098                         SCTP_SOCKET_LOCK(so, 0);
4099                         SCTP_TCB_LOCK(stcb);
4100                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4101                 }
4102 #endif
4103                 if (net) {
4104                         /* for link local this must be done */
4105                         sin6->sin6_scope_id = prev_scope;
4106                         sin6->sin6_port = prev_port;
4107                 }
4108                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4109                 SCTP_STAT_INCR(sctps_sendpackets);
4110                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4111                 if (ret) {
4112                         SCTP_STAT_INCR(sctps_senderrors);
4113                 }
4114                 if (net == NULL) {
4115                         /* Now if we had a temp route free it */
4116                         if (ro->ro_rt) {
4117                                 RTFREE(ro->ro_rt);
4118                         }
4119                 } else {
4120                         /* PMTU check versus smallest asoc MTU goes here */
4121                         if (ro->ro_rt == NULL) {
4122                                 /* Route was freed */
4123                                 if (net->ro._s_addr &&
4124                                     net->src_addr_selected) {
4125                                         sctp_free_ifa(net->ro._s_addr);
4126                                         net->ro._s_addr = NULL;
4127                                 }
4128                                 net->src_addr_selected = 0;
4129                         }
4130                         if ((ro->ro_rt != NULL) &&
4131                             (net->ro._s_addr)) {
4132                                 uint32_t mtu;
4133
4134                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4135                                 if (mtu &&
4136                                     (stcb->asoc.smallest_mtu > mtu)) {
4137 #ifdef SCTP_PRINT_FOR_B_AND_M
4138                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
4139                                             mtu);
4140 #endif
4141                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4142                                         net->mtu = mtu;
4143                                         if (net->port) {
4144                                                 net->mtu -= sizeof(struct udphdr);
4145                                         }
4146                                 }
4147                         } else if (ifp) {
4148                                 if (ND_IFINFO(ifp)->linkmtu &&
4149                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4150 #ifdef SCTP_PRINT_FOR_B_AND_M
4151                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
4152                                             ND_IFINFO(ifp)->linkmtu);
4153 #endif
4154                                         sctp_mtu_size_reset(inp,
4155                                             &stcb->asoc,
4156                                             ND_IFINFO(ifp)->linkmtu);
4157                                 }
4158                         }
4159                 }
4160                 return (ret);
4161         }
4162 #endif
4163         else {
4164                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4165                     ((struct sockaddr *)to)->sa_family);
4166                 sctp_m_freem(m);
4167                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4168                 return (EFAULT);
4169         }
4170 }
4171
4172
4173 void
4174 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4175 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4176     SCTP_UNUSED
4177 #endif
4178 )
4179 {
4180         struct mbuf *m, *m_at, *mp_last;
4181         struct sctp_nets *net;
4182         struct sctp_init_chunk *init;
4183         struct sctp_supported_addr_param *sup_addr;
4184         struct sctp_adaptation_layer_indication *ali;
4185         struct sctp_ecn_supported_param *ecn;
4186         struct sctp_prsctp_supported_param *prsctp;
4187         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4188         struct sctp_supported_chunk_types_param *pr_supported;
4189         int cnt_inits_to = 0;
4190         int padval, ret;
4191         int num_ext;
4192         int p_len;
4193
4194         /* INIT's always go to the primary (and usually ONLY address) */
4195         mp_last = NULL;
4196         net = stcb->asoc.primary_destination;
4197         if (net == NULL) {
4198                 net = TAILQ_FIRST(&stcb->asoc.nets);
4199                 if (net == NULL) {
4200                         /* TSNH */
4201                         return;
4202                 }
4203                 /* we confirm any address we send an INIT to */
4204                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4205                 (void)sctp_set_primary_addr(stcb, NULL, net);
4206         } else {
4207                 /* we confirm any address we send an INIT to */
4208                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4209         }
4210         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4211 #ifdef INET6
4212         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4213                 /*
4214                  * special hook, if we are sending to link local it will not
4215                  * show up in our private address count.
4216                  */
4217                 struct sockaddr_in6 *sin6l;
4218
4219                 sin6l = &net->ro._l_addr.sin6;
4220                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4221                         cnt_inits_to = 1;
4222         }
4223 #endif
4224         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4225                 /* This case should not happen */
4226                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4227                 return;
4228         }
4229         /* start the INIT timer */
4230         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4231
4232         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4233         if (m == NULL) {
4234                 /* No memory, INIT timer will re-attempt. */
4235                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4236                 return;
4237         }
4238         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4239         /*
4240          * assume peer supports asconf in order to be able to queue local
4241          * address changes while an INIT is in flight and before the assoc
4242          * is established.
4243          */
4244         stcb->asoc.peer_supports_asconf = 1;
4245         /* Now lets put the SCTP header in place */
4246         init = mtod(m, struct sctp_init_chunk *);
4247         /* now the chunk header */
4248         init->ch.chunk_type = SCTP_INITIATION;
4249         init->ch.chunk_flags = 0;
4250         /* fill in later from mbuf we build */
4251         init->ch.chunk_length = 0;
4252         /* place in my tag */
4253         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4254         /* set up some of the credits. */
4255         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4256             SCTP_MINIMAL_RWND));
4257
4258         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4259         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4260         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4261         /* now the address restriction */
4262         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4263             sizeof(*init));
4264         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4265 #ifdef INET6
4266         /* we support 2 types: IPv6/IPv4 */
4267         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4268         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4269         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4270 #else
4271         /* we support 1 type: IPv4 */
4272         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4273         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4274         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4275 #endif
4276         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4277         /* adaptation layer indication parameter */
4278         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4279         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4280         ali->ph.param_length = htons(sizeof(*ali));
4281         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4282         SCTP_BUF_LEN(m) += sizeof(*ali);
4283         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4284
4285         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4286                 /* Add NAT friendly parameter */
4287                 struct sctp_paramhdr *ph;
4288
4289                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4290                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4291                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4292                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4293                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4294         }
4295         /* now any cookie time extensions */
4296         if (stcb->asoc.cookie_preserve_req) {
4297                 struct sctp_cookie_perserve_param *cookie_preserve;
4298
4299                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4300                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4301                 cookie_preserve->ph.param_length = htons(
4302                     sizeof(*cookie_preserve));
4303                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4304                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4305                 ecn = (struct sctp_ecn_supported_param *)(
4306                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4307                 stcb->asoc.cookie_preserve_req = 0;
4308         }
4309         /* ECN parameter */
4310         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4311                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4312                 ecn->ph.param_length = htons(sizeof(*ecn));
4313                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4314                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4315                     sizeof(*ecn));
4316         } else {
4317                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4318         }
4319         /* And now tell the peer we do pr-sctp */
4320         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4321         prsctp->ph.param_length = htons(sizeof(*prsctp));
4322         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4323
4324         /* And now tell the peer we do all the extensions */
4325         pr_supported = (struct sctp_supported_chunk_types_param *)
4326             ((caddr_t)prsctp + sizeof(*prsctp));
4327         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4328         num_ext = 0;
4329         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4330         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4331         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4332         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4333         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4334         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4335                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4336         }
4337         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4338                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4339         }
4340         p_len = sizeof(*pr_supported) + num_ext;
4341         pr_supported->ph.param_length = htons(p_len);
4342         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4343         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4344
4345
4346         /* ECN nonce: And now tell the peer we support ECN nonce */
4347         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4348                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4349                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4350                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4351                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4352                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4353         }
4354         /* add authentication parameters */
4355         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4356                 struct sctp_auth_random *randp;
4357                 struct sctp_auth_hmac_algo *hmacs;
4358                 struct sctp_auth_chunk_list *chunks;
4359
4360                 /* attach RANDOM parameter, if available */
4361                 if (stcb->asoc.authinfo.random != NULL) {
4362                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4363                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4364                         /* random key already contains the header */
4365                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4366                         /* zero out any padding required */
4367                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4368                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4369                 }
4370                 /* add HMAC_ALGO parameter */
4371                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4372                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4373                     (uint8_t *) hmacs->hmac_ids);
4374                 if (p_len > 0) {
4375                         p_len += sizeof(*hmacs);
4376                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4377                         hmacs->ph.param_length = htons(p_len);
4378                         /* zero out any padding required */
4379                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4380                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4381                 }
4382                 /* add CHUNKS parameter */
4383                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4384                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4385                     chunks->chunk_types);
4386                 if (p_len > 0) {
4387                         p_len += sizeof(*chunks);
4388                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4389                         chunks->ph.param_length = htons(p_len);
4390                         /* zero out any padding required */
4391                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4392                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4393                 }
4394         }
4395         m_at = m;
4396         /* now the addresses */
4397         {
4398                 struct sctp_scoping scp;
4399
4400                 /*
4401                  * To optimize this we could put the scoping stuff into a
4402                  * structure and remove the individual uint8's from the
4403                  * assoc structure. Then we could just sifa in the address
4404                  * within the stcb.. but for now this is a quick hack to get
4405                  * the address stuff teased apart.
4406                  */
4407                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4408                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4409                 scp.loopback_scope = stcb->asoc.loopback_scope;
4410                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4411                 scp.local_scope = stcb->asoc.local_scope;
4412                 scp.site_scope = stcb->asoc.site_scope;
4413
4414                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4415         }
4416
4417         /* calulate the size and update pkt header and chunk header */
4418         p_len = 0;
4419         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4420                 if (SCTP_BUF_NEXT(m_at) == NULL)
4421                         mp_last = m_at;
4422                 p_len += SCTP_BUF_LEN(m_at);
4423         }
4424         init->ch.chunk_length = htons(p_len);
4425         /*
4426          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4427          * here since the timer will drive a retranmission.
4428          */
4429
4430         /* I don't expect this to execute but we will be safe here */
4431         padval = p_len % 4;
4432         if ((padval) && (mp_last)) {
4433                 /*
4434                  * The compiler worries that mp_last may not be set even
4435                  * though I think it is impossible :-> however we add
4436                  * mp_last here just in case.
4437                  */
4438                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4439                 if (ret) {
4440                         /* Houston we have a problem, no space */
4441                         sctp_m_freem(m);
4442                         return;
4443                 }
4444                 p_len += padval;
4445         }
4446         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4447         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4448             (struct sockaddr *)&net->ro._l_addr,
4449             m, 0, NULL, 0, 0, 0, NULL, 0,
4450             inp->sctp_lport, stcb->rport, htonl(0),
4451             net->port, so_locked, NULL);
4452         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4453         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4454         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4455 }
4456
4457 struct mbuf *
4458 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4459     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4460 {
4461         /*
4462          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4463          * being equal to the beginning of the params i.e. (iphlen +
4464          * sizeof(struct sctp_init_msg) parse through the parameters to the
4465          * end of the mbuf verifying that all parameters are known.
4466          *
4467          * For unknown parameters build and return a mbuf with
4468          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4469          * processing this chunk stop, and set *abort_processing to 1.
4470          *
4471          * By having param_offset be pre-set to where parameters begin it is
4472          * hoped that this routine may be reused in the future by new
4473          * features.
4474          */
4475         struct sctp_paramhdr *phdr, params;
4476
4477         struct mbuf *mat, *op_err;
4478         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4479         int at, limit, pad_needed;
4480         uint16_t ptype, plen, padded_size;
4481         int err_at;
4482
4483         *abort_processing = 0;
4484         mat = in_initpkt;
4485         err_at = 0;
4486         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4487         at = param_offset;
4488         op_err = NULL;
4489         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4490         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4491         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4492                 ptype = ntohs(phdr->param_type);
4493                 plen = ntohs(phdr->param_length);
4494                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4495                         /* wacked parameter */
4496                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4497                         goto invalid_size;
4498                 }
4499                 limit -= SCTP_SIZE32(plen);
4500                 /*-
4501                  * All parameters for all chunks that we know/understand are
4502                  * listed here. We process them other places and make
4503                  * appropriate stop actions per the upper bits. However this
4504                  * is the generic routine processor's can call to get back
4505                  * an operr.. to either incorporate (init-ack) or send.
4506                  */
4507                 padded_size = SCTP_SIZE32(plen);
4508                 switch (ptype) {
4509                         /* Param's with variable size */
4510                 case SCTP_HEARTBEAT_INFO:
4511                 case SCTP_STATE_COOKIE:
4512                 case SCTP_UNRECOG_PARAM:
4513                 case SCTP_ERROR_CAUSE_IND:
4514                         /* ok skip fwd */
4515                         at += padded_size;
4516                         break;
4517                         /* Param's with variable size within a range */
4518                 case SCTP_CHUNK_LIST:
4519                 case SCTP_SUPPORTED_CHUNK_EXT:
4520                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4521                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4522                                 goto invalid_size;
4523                         }
4524                         at += padded_size;
4525                         break;
4526                 case SCTP_SUPPORTED_ADDRTYPE:
4527                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4528                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4529                                 goto invalid_size;
4530                         }
4531                         at += padded_size;
4532                         break;
4533                 case SCTP_RANDOM:
4534                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4535                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4536                                 goto invalid_size;
4537                         }
4538                         at += padded_size;
4539                         break;
4540                 case SCTP_SET_PRIM_ADDR:
4541                 case SCTP_DEL_IP_ADDRESS:
4542                 case SCTP_ADD_IP_ADDRESS:
4543                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4544                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4545                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4546                                 goto invalid_size;
4547                         }
4548                         at += padded_size;
4549                         break;
4550                         /* Param's with a fixed size */
4551                 case SCTP_IPV4_ADDRESS:
4552                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4553                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4554                                 goto invalid_size;
4555                         }
4556                         at += padded_size;
4557                         break;
4558                 case SCTP_IPV6_ADDRESS:
4559                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4560                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4561                                 goto invalid_size;
4562                         }
4563                         at += padded_size;
4564                         break;
4565                 case SCTP_COOKIE_PRESERVE:
4566                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4567                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4568                                 goto invalid_size;
4569                         }
4570                         at += padded_size;
4571                         break;
4572                 case SCTP_HAS_NAT_SUPPORT:
4573                         *nat_friendly = 1;
4574                         /* fall through */
4575                 case SCTP_ECN_NONCE_SUPPORTED:
4576                 case SCTP_PRSCTP_SUPPORTED:
4577
4578                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4579                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4580                                 goto invalid_size;
4581                         }
4582                         at += padded_size;
4583                         break;
4584                 case SCTP_ECN_CAPABLE:
4585                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4586                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4587                                 goto invalid_size;
4588                         }
4589                         at += padded_size;
4590                         break;
4591                 case SCTP_ULP_ADAPTATION:
4592                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4593                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4594                                 goto invalid_size;
4595                         }
4596                         at += padded_size;
4597                         break;
4598                 case SCTP_SUCCESS_REPORT:
4599                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4600                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4601                                 goto invalid_size;
4602                         }
4603                         at += padded_size;
4604                         break;
4605                 case SCTP_HOSTNAME_ADDRESS:
4606                         {
4607                                 /* We can NOT handle HOST NAME addresses!! */
4608                                 int l_len;
4609
4610                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4611                                 *abort_processing = 1;
4612                                 if (op_err == NULL) {
4613                                         /* Ok need to try to get a mbuf */
4614 #ifdef INET6
4615                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4616 #else
4617                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4618 #endif
4619                                         l_len += plen;
4620                                         l_len += sizeof(struct sctp_paramhdr);
4621                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4622                                         if (op_err) {
4623                                                 SCTP_BUF_LEN(op_err) = 0;
4624                                                 /*
4625                                                  * pre-reserve space for ip
4626                                                  * and sctp header  and
4627                                                  * chunk hdr
4628                                                  */
4629 #ifdef INET6
4630                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4631 #else
4632                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4633 #endif
4634                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4635                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4636                                         }
4637                                 }
4638                                 if (op_err) {
4639                                         /* If we have space */
4640                                         struct sctp_paramhdr s;
4641
4642                                         if (err_at % 4) {
4643                                                 uint32_t cpthis = 0;
4644
4645                                                 pad_needed = 4 - (err_at % 4);
4646                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4647                                                 err_at += pad_needed;
4648                                         }
4649                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4650                                         s.param_length = htons(sizeof(s) + plen);
4651                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4652                                         err_at += sizeof(s);
4653                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4654                                         if (phdr == NULL) {
4655                                                 sctp_m_freem(op_err);
4656                                                 /*
4657                                                  * we are out of memory but
4658                                                  * we still need to have a
4659                                                  * look at what to do (the
4660                                                  * system is in trouble
4661                                                  * though).
4662                                                  */
4663                                                 return (NULL);
4664                                         }
4665                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4666                                         err_at += plen;
4667                                 }
4668                                 return (op_err);
4669                                 break;
4670                         }
4671                 default:
4672                         /*
4673                          * we do not recognize the parameter figure out what
4674                          * we do.
4675                          */
4676                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4677                         if ((ptype & 0x4000) == 0x4000) {
4678                                 /* Report bit is set?? */
4679                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4680                                 if (op_err == NULL) {
4681                                         int l_len;
4682
4683                                         /* Ok need to try to get an mbuf */
4684 #ifdef INET6
4685                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4686 #else
4687                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4688 #endif
4689                                         l_len += plen;
4690                                         l_len += sizeof(struct sctp_paramhdr);
4691                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4692                                         if (op_err) {
4693                                                 SCTP_BUF_LEN(op_err) = 0;
4694 #ifdef INET6
4695                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4696 #else
4697                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4698 #endif
4699                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4700                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4701                                         }
4702                                 }
4703                                 if (op_err) {
4704                                         /* If we have space */
4705                                         struct sctp_paramhdr s;
4706
4707                                         if (err_at % 4) {
4708                                                 uint32_t cpthis = 0;
4709
4710                                                 pad_needed = 4 - (err_at % 4);
4711                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4712                                                 err_at += pad_needed;
4713                                         }
4714                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4715                                         s.param_length = htons(sizeof(s) + plen);
4716                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4717                                         err_at += sizeof(s);
4718                                         if (plen > sizeof(tempbuf)) {
4719                                                 plen = sizeof(tempbuf);
4720                                         }
4721                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4722                                         if (phdr == NULL) {
4723                                                 sctp_m_freem(op_err);
4724                                                 /*
4725                                                  * we are out of memory but
4726                                                  * we still need to have a
4727                                                  * look at what to do (the
4728                                                  * system is in trouble
4729                                                  * though).
4730                                                  */
4731                                                 op_err = NULL;
4732                                                 goto more_processing;
4733                                         }
4734                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4735                                         err_at += plen;
4736                                 }
4737                         }
4738         more_processing:
4739                         if ((ptype & 0x8000) == 0x0000) {
4740                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4741                                 return (op_err);
4742                         } else {
4743                                 /* skip this chunk and continue processing */
4744                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4745                                 at += SCTP_SIZE32(plen);
4746                         }
4747                         break;
4748
4749                 }
4750                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4751         }
4752         return (op_err);
4753 invalid_size:
4754         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4755         *abort_processing = 1;
4756         if ((op_err == NULL) && phdr) {
4757                 int l_len;
4758
4759 #ifdef INET6
4760                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4761 #else
4762                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4763 #endif
4764                 l_len += (2 * sizeof(struct sctp_paramhdr));
4765                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4766                 if (op_err) {
4767                         SCTP_BUF_LEN(op_err) = 0;
4768 #ifdef INET6
4769                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4770 #else
4771                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4772 #endif
4773                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4774                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4775                 }
4776         }
4777         if ((op_err) && phdr) {
4778                 struct sctp_paramhdr s;
4779
4780                 if (err_at % 4) {
4781                         uint32_t cpthis = 0;
4782
4783                         pad_needed = 4 - (err_at % 4);
4784                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4785                         err_at += pad_needed;
4786                 }
4787                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4788                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4789                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4790                 err_at += sizeof(s);
4791                 /* Only copy back the p-hdr that caused the issue */
4792                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4793         }
4794         return (op_err);
4795 }
4796
4797 static int
4798 sctp_are_there_new_addresses(struct sctp_association *asoc,
4799     struct mbuf *in_initpkt, int iphlen, int offset)
4800 {
4801         /*
4802          * Given a INIT packet, look through the packet to verify that there
4803          * are NO new addresses. As we go through the parameters add reports
4804          * of any un-understood parameters that require an error.  Also we
4805          * must return (1) to drop the packet if we see a un-understood
4806          * parameter that tells us to drop the chunk.
4807          */
4808         struct sockaddr_in sin4, *sa4;
4809
4810 #ifdef INET6
4811         struct sockaddr_in6 sin6, *sa6;
4812
4813 #endif
4814         struct sockaddr *sa_touse;
4815         struct sockaddr *sa;
4816         struct sctp_paramhdr *phdr, params;
4817         struct ip *iph;
4818
4819 #ifdef INET6
4820         struct ip6_hdr *ip6h;
4821
4822 #endif
4823         struct mbuf *mat;
4824         uint16_t ptype, plen;
4825         int err_at;
4826         uint8_t fnd;
4827         struct sctp_nets *net;
4828
4829         memset(&sin4, 0, sizeof(sin4));
4830 #ifdef INET6
4831         memset(&sin6, 0, sizeof(sin6));
4832 #endif
4833         sin4.sin_family = AF_INET;
4834         sin4.sin_len = sizeof(sin4);
4835 #ifdef INET6
4836         sin6.sin6_family = AF_INET6;
4837         sin6.sin6_len = sizeof(sin6);
4838 #endif
4839         sa_touse = NULL;
4840         /* First what about the src address of the pkt ? */
4841         iph = mtod(in_initpkt, struct ip *);
4842         switch (iph->ip_v) {
4843         case IPVERSION:
4844                 /* source addr is IPv4 */
4845                 sin4.sin_addr = iph->ip_src;
4846                 sa_touse = (struct sockaddr *)&sin4;
4847                 break;
4848 #ifdef INET6
4849         case IPV6_VERSION >> 4:
4850                 /* source addr is IPv6 */
4851                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4852                 sin6.sin6_addr = ip6h->ip6_src;
4853                 sa_touse = (struct sockaddr *)&sin6;
4854                 break;
4855 #endif
4856         default:
4857                 return (1);
4858         }
4859
4860         fnd = 0;
4861         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4862                 sa = (struct sockaddr *)&net->ro._l_addr;
4863                 if (sa->sa_family == sa_touse->sa_family) {
4864                         if (sa->sa_family == AF_INET) {
4865                                 sa4 = (struct sockaddr_in *)sa;
4866                                 if (sa4->sin_addr.s_addr ==
4867                                     sin4.sin_addr.s_addr) {
4868                                         fnd = 1;
4869                                         break;
4870                                 }
4871                         }
4872 #ifdef INET6
4873                         if (sa->sa_family == AF_INET6) {
4874                                 sa6 = (struct sockaddr_in6 *)sa;
4875                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4876                                     &sin6)) {
4877                                         fnd = 1;
4878                                         break;
4879                                 }
4880                         }
4881 #endif
4882                 }
4883         }
4884         if (fnd == 0) {
4885                 /* New address added! no need to look futher. */
4886                 return (1);
4887         }
4888         /* Ok so far lets munge through the rest of the packet */
4889         mat = in_initpkt;
4890         err_at = 0;
4891         sa_touse = NULL;
4892         offset += sizeof(struct sctp_init_chunk);
4893         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4894         while (phdr) {
4895                 ptype = ntohs(phdr->param_type);
4896                 plen = ntohs(phdr->param_length);
4897                 if (ptype == SCTP_IPV4_ADDRESS) {
4898                         struct sctp_ipv4addr_param *p4, p4_buf;
4899
4900                         phdr = sctp_get_next_param(mat, offset,
4901                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4902                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4903                             phdr == NULL) {
4904                                 return (1);
4905                         }
4906                         p4 = (struct sctp_ipv4addr_param *)phdr;
4907                         sin4.sin_addr.s_addr = p4->addr;
4908                         sa_touse = (struct sockaddr *)&sin4;
4909                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4910                         struct sctp_ipv6addr_param *p6, p6_buf;
4911
4912                         phdr = sctp_get_next_param(mat, offset,
4913                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4914                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4915                             phdr == NULL) {
4916                                 return (1);
4917                         }
4918                         p6 = (struct sctp_ipv6addr_param *)phdr;
4919 #ifdef INET6
4920                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4921                             sizeof(p6->addr));
4922 #endif
4923                         sa_touse = (struct sockaddr *)&sin4;
4924                 }
4925                 if (sa_touse) {
4926                         /* ok, sa_touse points to one to check */
4927                         fnd = 0;
4928                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4929                                 sa = (struct sockaddr *)&net->ro._l_addr;
4930                                 if (sa->sa_family != sa_touse->sa_family) {
4931                                         continue;
4932                                 }
4933                                 if (sa->sa_family == AF_INET) {
4934                                         sa4 = (struct sockaddr_in *)sa;
4935                                         if (sa4->sin_addr.s_addr ==
4936                                             sin4.sin_addr.s_addr) {
4937                                                 fnd = 1;
4938                                                 break;
4939                                         }
4940                                 }
4941 #ifdef INET6
4942                                 if (sa->sa_family == AF_INET6) {
4943                                         sa6 = (struct sockaddr_in6 *)sa;
4944                                         if (SCTP6_ARE_ADDR_EQUAL(
4945                                             sa6, &sin6)) {
4946                                                 fnd = 1;
4947                                                 break;
4948                                         }
4949                                 }
4950 #endif
4951                         }
4952                         if (!fnd) {
4953                                 /* New addr added! no need to look further */
4954                                 return (1);
4955                         }
4956                 }
4957                 offset += SCTP_SIZE32(plen);
4958                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4959         }
4960         return (0);
4961 }
4962
4963 /*
4964  * Given a MBUF chain that was sent into us containing an INIT. Build a
4965  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4966  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4967  * message (i.e. the struct sctp_init_msg).
4968  */
4969 void
4970 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4971     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4972     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4973 {
4974         struct sctp_association *asoc;
4975         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4976         struct sctp_init_ack_chunk *initack;
4977         struct sctp_adaptation_layer_indication *ali;
4978         struct sctp_ecn_supported_param *ecn;
4979         struct sctp_prsctp_supported_param *prsctp;
4980         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4981         struct sctp_supported_chunk_types_param *pr_supported;
4982         union sctp_sockstore store, store1, *over_addr;
4983         struct sockaddr_in *sin, *to_sin;
4984
4985 #ifdef INET6
4986         struct sockaddr_in6 *sin6, *to_sin6;
4987
4988 #endif
4989         struct ip *iph;
4990
4991 #ifdef INET6
4992         struct ip6_hdr *ip6;
4993
4994 #endif
4995         struct sockaddr *to;
4996         struct sctp_state_cookie stc;
4997         struct sctp_nets *net = NULL;
4998         uint8_t *signature = NULL;
4999         int cnt_inits_to = 0;
5000         uint16_t his_limit, i_want;
5001         int abort_flag, padval;
5002         int num_ext;
5003         int p_len;
5004         int nat_friendly = 0;
5005         struct socket *so;
5006
5007         if (stcb)
5008                 asoc = &stcb->asoc;
5009         else
5010                 asoc = NULL;
5011         mp_last = NULL;
5012         if ((asoc != NULL) &&
5013             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5014             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
5015                 /* new addresses, out of here in non-cookie-wait states */
5016                 /*
5017                  * Send a ABORT, we don't add the new address error clause
5018                  * though we even set the T bit and copy in the 0 tag.. this
5019                  * looks no different than if no listener was present.
5020                  */
5021                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5022                 return;
5023         }
5024         abort_flag = 0;
5025         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5026             (offset + sizeof(struct sctp_init_chunk)),
5027             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5028         if (abort_flag) {
5029 do_a_abort:
5030                 sctp_send_abort(init_pkt, iphlen, sh,
5031                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5032                 return;
5033         }
5034         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5035         if (m == NULL) {
5036                 /* No memory, INIT timer will re-attempt. */
5037                 if (op_err)
5038                         sctp_m_freem(op_err);
5039                 return;
5040         }
5041         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5042
5043         /* the time I built cookie */
5044         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5045
5046         /* populate any tie tags */
5047         if (asoc != NULL) {
5048                 /* unlock before tag selections */
5049                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5050                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5051                 stc.cookie_life = asoc->cookie_life;
5052                 net = asoc->primary_destination;
5053         } else {
5054                 stc.tie_tag_my_vtag = 0;
5055                 stc.tie_tag_peer_vtag = 0;
5056                 /* life I will award this cookie */
5057                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5058         }
5059
5060         /* copy in the ports for later check */
5061         stc.myport = sh->dest_port;
5062         stc.peerport = sh->src_port;
5063
5064         /*
5065          * If we wanted to honor cookie life extentions, we would add to
5066          * stc.cookie_life. For now we should NOT honor any extension
5067          */
5068         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5069         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5070                 struct inpcb *in_inp;
5071
5072                 /* Its a V6 socket */
5073                 in_inp = (struct inpcb *)inp;
5074                 stc.ipv6_addr_legal = 1;
5075                 /* Now look at the binding flag to see if V4 will be legal */
5076                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5077                         stc.ipv4_addr_legal = 1;
5078                 } else {
5079                         /* V4 addresses are NOT legal on the association */
5080                         stc.ipv4_addr_legal = 0;
5081                 }
5082         } else {
5083                 /* Its a V4 socket, no - V6 */
5084                 stc.ipv4_addr_legal = 1;
5085                 stc.ipv6_addr_legal = 0;
5086         }
5087
5088 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5089         stc.ipv4_scope = 1;
5090 #else
5091         stc.ipv4_scope = 0;
5092 #endif
5093         /* now for scope setup */
5094         memset((caddr_t)&store, 0, sizeof(store));
5095         memset((caddr_t)&store1, 0, sizeof(store1));
5096         sin = &store.sin;
5097         to_sin = &store1.sin;
5098 #ifdef INET6
5099         sin6 = &store.sin6;
5100         to_sin6 = &store1.sin6;
5101 #endif
5102         iph = mtod(init_pkt, struct ip *);
5103         /* establish the to_addr's */
5104         switch (iph->ip_v) {
5105         case IPVERSION:
5106                 to_sin->sin_port = sh->dest_port;
5107                 to_sin->sin_family = AF_INET;
5108                 to_sin->sin_len = sizeof(struct sockaddr_in);
5109                 to_sin->sin_addr = iph->ip_dst;
5110                 break;
5111 #ifdef INET6
5112         case IPV6_VERSION >> 4:
5113                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5114                 to_sin6->sin6_addr = ip6->ip6_dst;
5115                 to_sin6->sin6_scope_id = 0;
5116                 to_sin6->sin6_port = sh->dest_port;
5117                 to_sin6->sin6_family = AF_INET6;
5118                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5119                 break;
5120 #endif
5121         default:
5122                 goto do_a_abort;
5123                 break;
5124         };
5125
5126         if (net == NULL) {
5127                 to = (struct sockaddr *)&store;
5128                 switch (iph->ip_v) {
5129                 case IPVERSION:
5130                         {
5131                                 sin->sin_family = AF_INET;
5132                                 sin->sin_len = sizeof(struct sockaddr_in);
5133                                 sin->sin_port = sh->src_port;
5134                                 sin->sin_addr = iph->ip_src;
5135                                 /* lookup address */
5136                                 stc.address[0] = sin->sin_addr.s_addr;
5137                                 stc.address[1] = 0;
5138                                 stc.address[2] = 0;
5139                                 stc.address[3] = 0;
5140                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5141                                 /* local from address */
5142                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5143                                 stc.laddress[1] = 0;
5144                                 stc.laddress[2] = 0;
5145                                 stc.laddress[3] = 0;
5146                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5147                                 /* scope_id is only for v6 */
5148                                 stc.scope_id = 0;
5149 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5150                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5151                                         stc.ipv4_scope = 1;
5152                                 }
5153 #else
5154                                 stc.ipv4_scope = 1;
5155 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5156                                 /* Must use the address in this case */
5157                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5158                                         stc.loopback_scope = 1;
5159                                         stc.ipv4_scope = 1;
5160                                         stc.site_scope = 1;
5161                                         stc.local_scope = 0;
5162                                 }
5163                                 break;
5164                         }
5165 #ifdef INET6
5166                 case IPV6_VERSION >> 4:
5167                         {
5168                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5169                                 sin6->sin6_family = AF_INET6;
5170                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5171                                 sin6->sin6_port = sh->src_port;
5172                                 sin6->sin6_addr = ip6->ip6_src;
5173                                 /* lookup address */
5174                                 memcpy(&stc.address, &sin6->sin6_addr,
5175                                     sizeof(struct in6_addr));
5176                                 sin6->sin6_scope_id = 0;
5177                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5178                                 stc.scope_id = 0;
5179                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5180                                         /*
5181                                          * FIX ME: does this have scope from
5182                                          * rcvif?
5183                                          */
5184                                         (void)sa6_recoverscope(sin6);
5185                                         stc.scope_id = sin6->sin6_scope_id;
5186                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5187                                         stc.loopback_scope = 1;
5188                                         stc.local_scope = 0;
5189                                         stc.site_scope = 1;
5190                                         stc.ipv4_scope = 1;
5191                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5192                                         /*
5193                                          * If the new destination is a
5194                                          * LINK_LOCAL we must have common
5195                                          * both site and local scope. Don't
5196                                          * set local scope though since we
5197                                          * must depend on the source to be
5198                                          * added implicitly. We cannot
5199                                          * assure just because we share one
5200                                          * link that all links are common.
5201                                          */
5202                                         stc.local_scope = 0;
5203                                         stc.site_scope = 1;
5204                                         stc.ipv4_scope = 1;
5205                                         /*
5206                                          * we start counting for the private
5207                                          * address stuff at 1. since the
5208                                          * link local we source from won't
5209                                          * show up in our scoped count.
5210                                          */
5211                                         cnt_inits_to = 1;
5212                                         /*
5213                                          * pull out the scope_id from
5214                                          * incoming pkt
5215                                          */
5216                                         /*
5217                                          * FIX ME: does this have scope from
5218                                          * rcvif?
5219                                          */
5220                                         (void)sa6_recoverscope(sin6);
5221                                         stc.scope_id = sin6->sin6_scope_id;
5222                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5223                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5224                                         /*
5225                                          * If the new destination is
5226                                          * SITE_LOCAL then we must have site
5227                                          * scope in common.
5228                                          */
5229                                         stc.site_scope = 1;
5230                                 }
5231                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5232                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5233                                 break;
5234                         }
5235 #endif
5236                 default:
5237                         /* TSNH */
5238                         goto do_a_abort;
5239                         break;
5240                 }
5241         } else {
5242                 /* set the scope per the existing tcb */
5243
5244 #ifdef INET6
5245                 struct sctp_nets *lnet;
5246
5247 #endif
5248
5249                 stc.loopback_scope = asoc->loopback_scope;
5250                 stc.ipv4_scope = asoc->ipv4_local_scope;
5251                 stc.site_scope = asoc->site_scope;
5252                 stc.local_scope = asoc->local_scope;
5253 #ifdef INET6
5254                 /* Why do we not consider IPv4 LL addresses? */
5255                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5256                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5257                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5258                                         /*
5259                                          * if we have a LL address, start
5260                                          * counting at 1.
5261                                          */
5262                                         cnt_inits_to = 1;
5263                                 }
5264                         }
5265                 }
5266 #endif
5267                 /* use the net pointer */
5268                 to = (struct sockaddr *)&net->ro._l_addr;
5269                 switch (to->sa_family) {
5270                 case AF_INET:
5271                         sin = (struct sockaddr_in *)to;
5272                         stc.address[0] = sin->sin_addr.s_addr;
5273                         stc.address[1] = 0;
5274                         stc.address[2] = 0;
5275                         stc.address[3] = 0;
5276                         stc.addr_type = SCTP_IPV4_ADDRESS;
5277                         if (net->src_addr_selected == 0) {
5278                                 /*
5279                                  * strange case here, the INIT should have
5280                                  * did the selection.
5281                                  */
5282                                 net->ro._s_addr = sctp_source_address_selection(inp,
5283                                     stcb, (sctp_route_t *) & net->ro,
5284                                     net, 0, vrf_id);
5285                                 if (net->ro._s_addr == NULL)
5286                                         return;
5287
5288                                 net->src_addr_selected = 1;
5289
5290                         }
5291                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5292                         stc.laddress[1] = 0;
5293                         stc.laddress[2] = 0;
5294                         stc.laddress[3] = 0;
5295                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5296                         break;
5297 #ifdef INET6
5298                 case AF_INET6:
5299                         sin6 = (struct sockaddr_in6 *)to;
5300                         memcpy(&stc.address, &sin6->sin6_addr,
5301                             sizeof(struct in6_addr));
5302                         stc.addr_type = SCTP_IPV6_ADDRESS;
5303                         if (net->src_addr_selected == 0) {
5304                                 /*
5305                                  * strange case here, the INIT should have
5306                                  * did the selection.
5307                                  */
5308                                 net->ro._s_addr = sctp_source_address_selection(inp,
5309                                     stcb, (sctp_route_t *) & net->ro,
5310                                     net, 0, vrf_id);
5311                                 if (net->ro._s_addr == NULL)
5312                                         return;
5313
5314                                 net->src_addr_selected = 1;
5315                         }
5316                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5317                             sizeof(struct in6_addr));
5318                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5319                         break;
5320 #endif
5321                 }
5322         }
5323         /* Now lets put the SCTP header in place */
5324         initack = mtod(m, struct sctp_init_ack_chunk *);
5325         /* Save it off for quick ref */
5326         stc.peers_vtag = init_chk->init.initiate_tag;
5327         /* who are we */
5328         memcpy(stc.identification, SCTP_VERSION_STRING,
5329             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5330         /* now the chunk header */
5331         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5332         initack->ch.chunk_flags = 0;
5333         /* fill in later from mbuf we build */
5334         initack->ch.chunk_length = 0;
5335         /* place in my tag */
5336         if ((asoc != NULL) &&
5337             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5338             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5339             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5340                 /* re-use the v-tags and init-seq here */
5341                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5342                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5343         } else {
5344                 uint32_t vtag, itsn;
5345
5346                 if (hold_inp_lock) {
5347                         SCTP_INP_INCR_REF(inp);
5348                         SCTP_INP_RUNLOCK(inp);
5349                 }
5350                 if (asoc) {
5351                         atomic_add_int(&asoc->refcnt, 1);
5352                         SCTP_TCB_UNLOCK(stcb);
5353         new_tag:
5354                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5355                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5356                                 /*
5357                                  * Got a duplicate vtag on some guy behind a
5358                                  * nat make sure we don't use it.
5359                                  */
5360                                 goto new_tag;
5361                         }
5362                         initack->init.initiate_tag = htonl(vtag);
5363                         /* get a TSN to use too */
5364                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5365                         initack->init.initial_tsn = htonl(itsn);
5366                         SCTP_TCB_LOCK(stcb);
5367                         atomic_add_int(&asoc->refcnt, -1);
5368                 } else {
5369                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5370                         initack->init.initiate_tag = htonl(vtag);
5371                         /* get a TSN to use too */
5372                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5373                 }
5374                 if (hold_inp_lock) {
5375                         SCTP_INP_RLOCK(inp);
5376                         SCTP_INP_DECR_REF(inp);
5377                 }
5378         }
5379         /* save away my tag to */
5380         stc.my_vtag = initack->init.initiate_tag;
5381
5382         /* set up some of the credits. */
5383         so = inp->sctp_socket;
5384         if (so == NULL) {
5385                 /* memory problem */
5386                 sctp_m_freem(m);
5387                 return;
5388         } else {
5389                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5390         }
5391         /* set what I want */
5392         his_limit = ntohs(init_chk->init.num_inbound_streams);
5393         /* choose what I want */
5394         if (asoc != NULL) {
5395                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5396                         i_want = asoc->streamoutcnt;
5397                 } else {
5398                         i_want = inp->sctp_ep.pre_open_stream_count;
5399                 }
5400         } else {
5401                 i_want = inp->sctp_ep.pre_open_stream_count;
5402         }
5403         if (his_limit < i_want) {
5404                 /* I Want more :< */
5405                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5406         } else {
5407                 /* I can have what I want :> */
5408                 initack->init.num_outbound_streams = htons(i_want);
5409         }
5410         /* tell him his limt. */
5411         initack->init.num_inbound_streams =
5412             htons(inp->sctp_ep.max_open_streams_intome);
5413
5414         /* adaptation layer indication parameter */
5415         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5416         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5417         ali->ph.param_length = htons(sizeof(*ali));
5418         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5419         SCTP_BUF_LEN(m) += sizeof(*ali);
5420         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5421
5422         /* ECN parameter */
5423         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5424                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5425                 ecn->ph.param_length = htons(sizeof(*ecn));
5426                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5427
5428                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5429                     sizeof(*ecn));
5430         } else {
5431                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5432         }
5433         /* And now tell the peer we do  pr-sctp */
5434         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5435         prsctp->ph.param_length = htons(sizeof(*prsctp));
5436         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5437         if (nat_friendly) {
5438                 /* Add NAT friendly parameter */
5439                 struct sctp_paramhdr *ph;
5440
5441                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5442                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5443                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5444                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5445         }
5446         /* And now tell the peer we do all the extensions */
5447         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5448         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5449         num_ext = 0;
5450         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5451         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5452         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5453         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5454         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5455         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5456                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5457         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5458                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5459         p_len = sizeof(*pr_supported) + num_ext;
5460         pr_supported->ph.param_length = htons(p_len);
5461         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5462         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5463
5464         /* ECN nonce: And now tell the peer we support ECN nonce */
5465         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5466                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5467                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5468                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5469                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5470                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5471         }
5472         /* add authentication parameters */
5473         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5474                 struct sctp_auth_random *randp;
5475                 struct sctp_auth_hmac_algo *hmacs;
5476                 struct sctp_auth_chunk_list *chunks;
5477                 uint16_t random_len;
5478
5479                 /* generate and add RANDOM parameter */
5480                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5481                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5482                 randp->ph.param_type = htons(SCTP_RANDOM);
5483                 p_len = sizeof(*randp) + random_len;
5484                 randp->ph.param_length = htons(p_len);
5485                 SCTP_READ_RANDOM(randp->random_data, random_len);
5486                 /* zero out any padding required */
5487                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5488                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5489
5490                 /* add HMAC_ALGO parameter */
5491                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5492                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5493                     (uint8_t *) hmacs->hmac_ids);
5494                 if (p_len > 0) {
5495                         p_len += sizeof(*hmacs);
5496                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5497                         hmacs->ph.param_length = htons(p_len);
5498                         /* zero out any padding required */
5499                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5500                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5501                 }
5502                 /* add CHUNKS parameter */
5503                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5504                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5505                     chunks->chunk_types);
5506                 if (p_len > 0) {
5507                         p_len += sizeof(*chunks);
5508                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5509                         chunks->ph.param_length = htons(p_len);
5510                         /* zero out any padding required */
5511                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5512                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5513                 }
5514         }
5515         m_at = m;
5516         /* now the addresses */
5517         {
5518                 struct sctp_scoping scp;
5519
5520                 /*
5521                  * To optimize this we could put the scoping stuff into a
5522                  * structure and remove the individual uint8's from the stc
5523                  * structure. Then we could just sifa in the address within
5524                  * the stc.. but for now this is a quick hack to get the
5525                  * address stuff teased apart.
5526                  */
5527                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5528                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5529                 scp.loopback_scope = stc.loopback_scope;
5530                 scp.ipv4_local_scope = stc.ipv4_scope;
5531                 scp.local_scope = stc.local_scope;
5532                 scp.site_scope = stc.site_scope;
5533                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5534         }
5535
5536         /* tack on the operational error if present */
5537         if (op_err) {
5538                 struct mbuf *ol;
5539                 int llen;
5540
5541                 llen = 0;
5542                 ol = op_err;
5543                 while (ol) {
5544                         llen += SCTP_BUF_LEN(ol);
5545                         ol = SCTP_BUF_NEXT(ol);
5546                 }
5547                 if (llen % 4) {
5548                         /* must add a pad to the param */
5549                         uint32_t cpthis = 0;
5550                         int padlen;
5551
5552                         padlen = 4 - (llen % 4);
5553                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5554                 }
5555                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5556                         m_at = SCTP_BUF_NEXT(m_at);
5557                 }
5558                 SCTP_BUF_NEXT(m_at) = op_err;
5559                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5560                         m_at = SCTP_BUF_NEXT(m_at);
5561                 }
5562         }
5563         /* pre-calulate the size and update pkt header and chunk header */
5564         p_len = 0;
5565         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5566                 p_len += SCTP_BUF_LEN(m_tmp);
5567                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5568                         /* m_tmp should now point to last one */
5569                         break;
5570                 }
5571         }
5572
5573         /* Now we must build a cookie */
5574         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5575         if (m_cookie == NULL) {
5576                 /* memory problem */
5577                 sctp_m_freem(m);
5578                 return;
5579         }
5580         /* Now append the cookie to the end and update the space/size */
5581         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5582
5583         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5584                 p_len += SCTP_BUF_LEN(m_tmp);
5585                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5586                         /* m_tmp should now point to last one */
5587                         mp_last = m_tmp;
5588                         break;
5589                 }
5590         }
5591         /*
5592          * Place in the size, but we don't include the last pad (if any) in
5593          * the INIT-ACK.
5594          */
5595         initack->ch.chunk_length = htons(p_len);
5596
5597         /*
5598          * Time to sign the cookie, we don't sign over the cookie signature
5599          * though thus we set trailer.
5600          */
5601         (void)sctp_hmac_m(SCTP_HMAC,
5602             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5603             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5604             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5605         /*
5606          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5607          * here since the timer will drive a retranmission.
5608          */
5609         padval = p_len % 4;
5610         if ((padval) && (mp_last)) {
5611                 /* see my previous comments on mp_last */
5612                 int ret;
5613
5614                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5615                 if (ret) {
5616                         /* Houston we have a problem, no space */
5617                         sctp_m_freem(m);
5618                         return;
5619                 }
5620                 p_len += padval;
5621         }
5622         if (stc.loopback_scope) {
5623                 over_addr = &store1;
5624         } else {
5625                 over_addr = NULL;
5626         }
5627
5628         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5629             0, NULL, 0,
5630             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5631             port, SCTP_SO_NOT_LOCKED, over_addr);
5632         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5633 }
5634
5635
5636 void
5637 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5638     struct sctp_association *asoc,
5639     struct sctp_stream_out *strq, int holds_lock)
5640 {
5641         if (holds_lock == 0) {
5642                 SCTP_TCB_SEND_LOCK(stcb);
5643         }
5644         if ((strq->next_spoke.tqe_next == NULL) &&
5645             (strq->next_spoke.tqe_prev == NULL)) {
5646                 TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5647         }
5648         if (holds_lock == 0) {
5649                 SCTP_TCB_SEND_UNLOCK(stcb);
5650         }
5651 }
5652
5653 void
5654 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5655     struct sctp_association *asoc,
5656     struct sctp_stream_out *strq,
5657     int holds_lock)
5658 {
5659         /* take off and then setup so we know it is not on the wheel */
5660         if (holds_lock == 0) {
5661                 SCTP_TCB_SEND_LOCK(stcb);
5662         }
5663         if (TAILQ_EMPTY(&strq->outqueue)) {
5664                 if (asoc->last_out_stream == strq) {
5665                         asoc->last_out_stream = TAILQ_PREV(asoc->last_out_stream, sctpwheel_listhead, next_spoke);
5666                         if (asoc->last_out_stream == NULL) {
5667                                 asoc->last_out_stream = TAILQ_LAST(&asoc->out_wheel, sctpwheel_listhead);
5668                         }
5669                         if (asoc->last_out_stream == strq) {
5670                                 asoc->last_out_stream = NULL;
5671                         }
5672                 }
5673                 TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5674                 strq->next_spoke.tqe_next = NULL;
5675                 strq->next_spoke.tqe_prev = NULL;
5676         }
5677         if (holds_lock == 0) {
5678                 SCTP_TCB_SEND_UNLOCK(stcb);
5679         }
5680 }
5681
5682 static void
5683 sctp_prune_prsctp(struct sctp_tcb *stcb,
5684     struct sctp_association *asoc,
5685     struct sctp_sndrcvinfo *srcv,
5686     int dataout)
5687 {
5688         int freed_spc = 0;
5689         struct sctp_tmit_chunk *chk, *nchk;
5690
5691         SCTP_TCB_LOCK_ASSERT(stcb);
5692         if ((asoc->peer_supports_prsctp) &&
5693             (asoc->sent_queue_cnt_removeable > 0)) {
5694                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5695                         /*
5696                          * Look for chunks marked with the PR_SCTP flag AND
5697                          * the buffer space flag. If the one being sent is
5698                          * equal or greater priority then purge the old one
5699                          * and free some space.
5700                          */
5701                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5702                                 /*
5703                                  * This one is PR-SCTP AND buffer space
5704                                  * limited type
5705                                  */
5706                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5707                                         /*
5708                                          * Lower numbers equates to higher
5709                                          * priority so if the one we are
5710                                          * looking at has a larger or equal
5711                                          * priority we want to drop the data
5712                                          * and NOT retransmit it.
5713                                          */
5714                                         if (chk->data) {
5715                                                 /*
5716                                                  * We release the book_size
5717                                                  * if the mbuf is here
5718                                                  */
5719                                                 int ret_spc;
5720                                                 int cause;
5721
5722                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5723                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5724                                                 else
5725                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5726                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5727                                                     cause,
5728                                                     SCTP_SO_LOCKED);
5729                                                 freed_spc += ret_spc;
5730                                                 if (freed_spc >= dataout) {
5731                                                         return;
5732                                                 }
5733                                         }       /* if chunk was present */
5734                                 }       /* if of sufficent priority */
5735                         }       /* if chunk has enabled */
5736                 }               /* tailqforeach */
5737
5738                 chk = TAILQ_FIRST(&asoc->send_queue);
5739                 while (chk) {
5740                         nchk = TAILQ_NEXT(chk, sctp_next);
5741                         /* Here we must move to the sent queue and mark */
5742                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5743                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5744                                         if (chk->data) {
5745                                                 /*
5746                                                  * We release the book_size
5747                                                  * if the mbuf is here
5748                                                  */
5749                                                 int ret_spc;
5750
5751                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5752                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5753                                                     SCTP_SO_LOCKED);
5754
5755                                                 freed_spc += ret_spc;
5756                                                 if (freed_spc >= dataout) {
5757                                                         return;
5758                                                 }
5759                                         }       /* end if chk->data */
5760                                 }       /* end if right class */
5761                         }       /* end if chk pr-sctp */
5762                         chk = nchk;
5763                 }               /* end while (chk) */
5764         }                       /* if enabled in asoc */
5765 }
5766
5767 int
5768 sctp_get_frag_point(struct sctp_tcb *stcb,
5769     struct sctp_association *asoc)
5770 {
5771         int siz, ovh;
5772
5773         /*
5774          * For endpoints that have both v6 and v4 addresses we must reserve
5775          * room for the ipv6 header, for those that are only dealing with V4
5776          * we use a larger frag point.
5777          */
5778         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5779                 ovh = SCTP_MED_OVERHEAD;
5780         } else {
5781                 ovh = SCTP_MED_V4_OVERHEAD;
5782         }
5783
5784         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5785                 siz = asoc->smallest_mtu - ovh;
5786         else
5787                 siz = (stcb->asoc.sctp_frag_point - ovh);
5788         /*
5789          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5790          */
5791         /* A data chunk MUST fit in a cluster */
5792         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5793         /* } */
5794
5795         /* adjust for an AUTH chunk if DATA requires auth */
5796         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5797                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5798
5799         if (siz % 4) {
5800                 /* make it an even word boundary please */
5801                 siz -= (siz % 4);
5802         }
5803         return (siz);
5804 }
5805
5806 static void
5807 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5808 {
5809         sp->pr_sctp_on = 0;
5810         /*
5811          * We assume that the user wants PR_SCTP_TTL if the user provides a
5812          * positive lifetime but does not specify any PR_SCTP policy. This
5813          * is a BAD assumption and causes problems at least with the
5814          * U-Vancovers MPI folks. I will change this to be no policy means
5815          * NO PR-SCTP.
5816          */
5817         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5818                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5819                 sp->pr_sctp_on = 1;
5820         } else {
5821                 return;
5822         }
5823         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5824         case CHUNK_FLAGS_PR_SCTP_BUF:
5825                 /*
5826                  * Time to live is a priority stored in tv_sec when doing
5827                  * the buffer drop thing.
5828                  */
5829                 sp->ts.tv_sec = sp->timetolive;
5830                 sp->ts.tv_usec = 0;
5831                 break;
5832         case CHUNK_FLAGS_PR_SCTP_TTL:
5833                 {
5834                         struct timeval tv;
5835
5836                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5837                         tv.tv_sec = sp->timetolive / 1000;
5838                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5839                         /*
5840                          * TODO sctp_constants.h needs alternative time
5841                          * macros when _KERNEL is undefined.
5842                          */
5843                         timevaladd(&sp->ts, &tv);
5844                 }
5845                 break;
5846         case CHUNK_FLAGS_PR_SCTP_RTX:
5847                 /*
5848                  * Time to live is a the number or retransmissions stored in
5849                  * tv_sec.
5850                  */
5851                 sp->ts.tv_sec = sp->timetolive;
5852                 sp->ts.tv_usec = 0;
5853                 break;
5854         default:
5855                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5856                     "Unknown PR_SCTP policy %u.\n",
5857                     PR_SCTP_POLICY(sp->sinfo_flags));
5858                 break;
5859         }
5860 }
5861
5862 static int
5863 sctp_msg_append(struct sctp_tcb *stcb,
5864     struct sctp_nets *net,
5865     struct mbuf *m,
5866     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5867 {
5868         int error = 0, holds_lock;
5869         struct mbuf *at;
5870         struct sctp_stream_queue_pending *sp = NULL;
5871         struct sctp_stream_out *strm;
5872
5873         /*
5874          * Given an mbuf chain, put it into the association send queue and
5875          * place it on the wheel
5876          */
5877         holds_lock = hold_stcb_lock;
5878         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5879                 /* Invalid stream number */
5880                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5881                 error = EINVAL;
5882                 goto out_now;
5883         }
5884         if ((stcb->asoc.stream_locked) &&
5885             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5886                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5887                 error = EINVAL;
5888                 goto out_now;
5889         }
5890         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5891         /* Now can we send this? */
5892         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5893             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5894             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5895             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5896                 /* got data while shutting down */
5897                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5898                 error = ECONNRESET;
5899                 goto out_now;
5900         }
5901         sctp_alloc_a_strmoq(stcb, sp);
5902         if (sp == NULL) {
5903                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5904                 error = ENOMEM;
5905                 goto out_now;
5906         }
5907         sp->sinfo_flags = srcv->sinfo_flags;
5908         sp->timetolive = srcv->sinfo_timetolive;
5909         sp->ppid = srcv->sinfo_ppid;
5910         sp->context = srcv->sinfo_context;
5911         sp->strseq = 0;
5912         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5913                 sp->net = net;
5914         } else {
5915                 sp->net = stcb->asoc.primary_destination;
5916         }
5917         atomic_add_int(&sp->net->ref_count, 1);
5918         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5919         sp->stream = srcv->sinfo_stream;
5920         sp->msg_is_complete = 1;
5921         sp->sender_all_done = 1;
5922         sp->some_taken = 0;
5923         sp->data = m;
5924         sp->tail_mbuf = NULL;
5925         sp->length = 0;
5926         at = m;
5927         sctp_set_prsctp_policy(sp);
5928         /*
5929          * We could in theory (for sendall) sifa the length in, but we would
5930          * still have to hunt through the chain since we need to setup the
5931          * tail_mbuf
5932          */
5933         while (at) {
5934                 if (SCTP_BUF_NEXT(at) == NULL)
5935                         sp->tail_mbuf = at;
5936                 sp->length += SCTP_BUF_LEN(at);
5937                 at = SCTP_BUF_NEXT(at);
5938         }
5939         SCTP_TCB_SEND_LOCK(stcb);
5940         sctp_snd_sb_alloc(stcb, sp->length);
5941         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5942         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5943         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5944                 sp->strseq = strm->next_sequence_sent;
5945                 strm->next_sequence_sent++;
5946         }
5947         if ((strm->next_spoke.tqe_next == NULL) &&
5948             (strm->next_spoke.tqe_prev == NULL)) {
5949                 /* Not on wheel, insert */
5950                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5951         }
5952         m = NULL;
5953         SCTP_TCB_SEND_UNLOCK(stcb);
5954 out_now:
5955         if (m) {
5956                 sctp_m_freem(m);
5957         }
5958         return (error);
5959 }
5960
5961
5962 static struct mbuf *
5963 sctp_copy_mbufchain(struct mbuf *clonechain,
5964     struct mbuf *outchain,
5965     struct mbuf **endofchain,
5966     int can_take_mbuf,
5967     int sizeofcpy,
5968     uint8_t copy_by_ref)
5969 {
5970         struct mbuf *m;
5971         struct mbuf *appendchain;
5972         caddr_t cp;
5973         int len;
5974
5975         if (endofchain == NULL) {
5976                 /* error */
5977 error_out:
5978                 if (outchain)
5979                         sctp_m_freem(outchain);
5980                 return (NULL);
5981         }
5982         if (can_take_mbuf) {
5983                 appendchain = clonechain;
5984         } else {
5985                 if (!copy_by_ref &&
5986                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5987                     ) {
5988                         /* Its not in a cluster */
5989                         if (*endofchain == NULL) {
5990                                 /* lets get a mbuf cluster */
5991                                 if (outchain == NULL) {
5992                                         /* This is the general case */
5993                         new_mbuf:
5994                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5995                                         if (outchain == NULL) {
5996                                                 goto error_out;
5997                                         }
5998                                         SCTP_BUF_LEN(outchain) = 0;
5999                                         *endofchain = outchain;
6000                                         /* get the prepend space */
6001                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6002                                 } else {
6003                                         /*
6004                                          * We really should not get a NULL
6005                                          * in endofchain
6006                                          */
6007                                         /* find end */
6008                                         m = outchain;
6009                                         while (m) {
6010                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6011                                                         *endofchain = m;
6012                                                         break;
6013                                                 }
6014                                                 m = SCTP_BUF_NEXT(m);
6015                                         }
6016                                         /* sanity */
6017                                         if (*endofchain == NULL) {
6018                                                 /*
6019                                                  * huh, TSNH XXX maybe we
6020                                                  * should panic
6021                                                  */
6022                                                 sctp_m_freem(outchain);
6023                                                 goto new_mbuf;
6024                                         }
6025                                 }
6026                                 /* get the new end of length */
6027                                 len = M_TRAILINGSPACE(*endofchain);
6028                         } else {
6029                                 /* how much is left at the end? */
6030                                 len = M_TRAILINGSPACE(*endofchain);
6031                         }
6032                         /* Find the end of the data, for appending */
6033                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6034
6035                         /* Now lets copy it out */
6036                         if (len >= sizeofcpy) {
6037                                 /* It all fits, copy it in */
6038                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6039                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6040                         } else {
6041                                 /* fill up the end of the chain */
6042                                 if (len > 0) {
6043                                         m_copydata(clonechain, 0, len, cp);
6044                                         SCTP_BUF_LEN((*endofchain)) += len;
6045                                         /* now we need another one */
6046                                         sizeofcpy -= len;
6047                                 }
6048                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6049                                 if (m == NULL) {
6050                                         /* We failed */
6051                                         goto error_out;
6052                                 }
6053                                 SCTP_BUF_NEXT((*endofchain)) = m;
6054                                 *endofchain = m;
6055                                 cp = mtod((*endofchain), caddr_t);
6056                                 m_copydata(clonechain, len, sizeofcpy, cp);
6057                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6058                         }
6059                         return (outchain);
6060                 } else {
6061                         /* copy the old fashion way */
6062                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6063 #ifdef SCTP_MBUF_LOGGING
6064                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6065                                 struct mbuf *mat;
6066
6067                                 mat = appendchain;
6068                                 while (mat) {
6069                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6070                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6071                                         }
6072                                         mat = SCTP_BUF_NEXT(mat);
6073                                 }
6074                         }
6075 #endif
6076                 }
6077         }
6078         if (appendchain == NULL) {
6079                 /* error */
6080                 if (outchain)
6081                         sctp_m_freem(outchain);
6082                 return (NULL);
6083         }
6084         if (outchain) {
6085                 /* tack on to the end */
6086                 if (*endofchain != NULL) {
6087                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6088                 } else {
6089                         m = outchain;
6090                         while (m) {
6091                                 if (SCTP_BUF_NEXT(m) == NULL) {
6092                                         SCTP_BUF_NEXT(m) = appendchain;
6093                                         break;
6094                                 }
6095                                 m = SCTP_BUF_NEXT(m);
6096                         }
6097                 }
6098                 /*
6099                  * save off the end and update the end-chain postion
6100                  */
6101                 m = appendchain;
6102                 while (m) {
6103                         if (SCTP_BUF_NEXT(m) == NULL) {
6104                                 *endofchain = m;
6105                                 break;
6106                         }
6107                         m = SCTP_BUF_NEXT(m);
6108                 }
6109                 return (outchain);
6110         } else {
6111                 /* save off the end and update the end-chain postion */
6112                 m = appendchain;
6113                 while (m) {
6114                         if (SCTP_BUF_NEXT(m) == NULL) {
6115                                 *endofchain = m;
6116                                 break;
6117                         }
6118                         m = SCTP_BUF_NEXT(m);
6119                 }
6120                 return (appendchain);
6121         }
6122 }
6123
6124 int
6125 sctp_med_chunk_output(struct sctp_inpcb *inp,
6126     struct sctp_tcb *stcb,
6127     struct sctp_association *asoc,
6128     int *num_out,
6129     int *reason_code,
6130     int control_only, int from_where,
6131     struct timeval *now, int *now_filled, int frag_point, int so_locked
6132 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6133     SCTP_UNUSED
6134 #endif
6135 );
6136
6137 static void
6138 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6139     uint32_t val)
6140 {
6141         struct sctp_copy_all *ca;
6142         struct mbuf *m;
6143         int ret = 0;
6144         int added_control = 0;
6145         int un_sent, do_chunk_output = 1;
6146         struct sctp_association *asoc;
6147
6148         ca = (struct sctp_copy_all *)ptr;
6149         if (ca->m == NULL) {
6150                 return;
6151         }
6152         if (ca->inp != inp) {
6153                 /* TSNH */
6154                 return;
6155         }
6156         if ((ca->m) && ca->sndlen) {
6157                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6158                 if (m == NULL) {
6159                         /* can't copy so we are done */
6160                         ca->cnt_failed++;
6161                         return;
6162                 }
6163 #ifdef SCTP_MBUF_LOGGING
6164                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6165                         struct mbuf *mat;
6166
6167                         mat = m;
6168                         while (mat) {
6169                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6170                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6171                                 }
6172                                 mat = SCTP_BUF_NEXT(mat);
6173                         }
6174                 }
6175 #endif
6176         } else {
6177                 m = NULL;
6178         }
6179         SCTP_TCB_LOCK_ASSERT(stcb);
6180         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6181                 /* Abort this assoc with m as the user defined reason */
6182                 if (m) {
6183                         struct sctp_paramhdr *ph;
6184
6185                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6186                         if (m) {
6187                                 ph = mtod(m, struct sctp_paramhdr *);
6188                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6189                                 ph->param_length = htons(ca->sndlen);
6190                         }
6191                         /*
6192                          * We add one here to keep the assoc from
6193                          * dis-appearing on us.
6194                          */
6195                         atomic_add_int(&stcb->asoc.refcnt, 1);
6196                         sctp_abort_an_association(inp, stcb,
6197                             SCTP_RESPONSE_TO_USER_REQ,
6198                             m, SCTP_SO_NOT_LOCKED);
6199                         /*
6200                          * sctp_abort_an_association calls sctp_free_asoc()
6201                          * free association will NOT free it since we
6202                          * incremented the refcnt .. we do this to prevent
6203                          * it being freed and things getting tricky since we
6204                          * could end up (from free_asoc) calling inpcb_free
6205                          * which would get a recursive lock call to the
6206                          * iterator lock.. But as a consequence of that the
6207                          * stcb will return to us un-locked.. since
6208                          * free_asoc returns with either no TCB or the TCB
6209                          * unlocked, we must relock.. to unlock in the
6210                          * iterator timer :-0
6211                          */
6212                         SCTP_TCB_LOCK(stcb);
6213                         atomic_add_int(&stcb->asoc.refcnt, -1);
6214                         goto no_chunk_output;
6215                 }
6216         } else {
6217                 if (m) {
6218                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6219                             &ca->sndrcv, 1);
6220                 }
6221                 asoc = &stcb->asoc;
6222                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6223                         /* shutdown this assoc */
6224                         int cnt;
6225
6226                         cnt = sctp_is_there_unsent_data(stcb);
6227
6228                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6229                             TAILQ_EMPTY(&asoc->sent_queue) &&
6230                             (cnt == 0)) {
6231                                 if (asoc->locked_on_sending) {
6232                                         goto abort_anyway;
6233                                 }
6234                                 /*
6235                                  * there is nothing queued to send, so I'm
6236                                  * done...
6237                                  */
6238                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6239                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6240                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6241                                         /*
6242                                          * only send SHUTDOWN the first time
6243                                          * through
6244                                          */
6245                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6246                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6247                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6248                                         }
6249                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6250                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6251                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6252                                             asoc->primary_destination);
6253                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6254                                             asoc->primary_destination);
6255                                         added_control = 1;
6256                                         do_chunk_output = 0;
6257                                 }
6258                         } else {
6259                                 /*
6260                                  * we still got (or just got) data to send,
6261                                  * so set SHUTDOWN_PENDING
6262                                  */
6263                                 /*
6264                                  * XXX sockets draft says that SCTP_EOF
6265                                  * should be sent with no data.  currently,
6266                                  * we will allow user data to be sent first
6267                                  * and move to SHUTDOWN-PENDING
6268                                  */
6269                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6270                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6271                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6272                                         if (asoc->locked_on_sending) {
6273                                                 /*
6274                                                  * Locked to send out the
6275                                                  * data
6276                                                  */
6277                                                 struct sctp_stream_queue_pending *sp;
6278
6279                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6280                                                 if (sp) {
6281                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6282                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6283                                                 }
6284                                         }
6285                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6286                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6287                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6288                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6289                                 abort_anyway:
6290                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6291                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6292                                                     SCTP_RESPONSE_TO_USER_REQ,
6293                                                     NULL, SCTP_SO_NOT_LOCKED);
6294                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6295                                                 goto no_chunk_output;
6296                                         }
6297                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6298                                             asoc->primary_destination);
6299                                 }
6300                         }
6301
6302                 }
6303         }
6304         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6305             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6306
6307         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6308             (stcb->asoc.total_flight > 0) &&
6309             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6310             ) {
6311                 do_chunk_output = 0;
6312         }
6313         if (do_chunk_output)
6314                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6315         else if (added_control) {
6316                 int num_out = 0, reason = 0, now_filled = 0;
6317                 struct timeval now;
6318                 int frag_point;
6319
6320                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6321                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6322                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6323         }
6324 no_chunk_output:
6325         if (ret) {
6326                 ca->cnt_failed++;
6327         } else {
6328                 ca->cnt_sent++;
6329         }
6330 }
6331
6332 static void
6333 sctp_sendall_completes(void *ptr, uint32_t val)
6334 {
6335         struct sctp_copy_all *ca;
6336
6337         ca = (struct sctp_copy_all *)ptr;
6338         /*
6339          * Do a notify here? Kacheong suggests that the notify be done at
6340          * the send time.. so you would push up a notification if any send
6341          * failed. Don't know if this is feasable since the only failures we
6342          * have is "memory" related and if you cannot get an mbuf to send
6343          * the data you surely can't get an mbuf to send up to notify the
6344          * user you can't send the data :->
6345          */
6346
6347         /* now free everything */
6348         sctp_m_freem(ca->m);
6349         SCTP_FREE(ca, SCTP_M_COPYAL);
6350 }
6351
6352
6353 #define MC_ALIGN(m, len) do {                                           \
6354         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6355 } while (0)
6356
6357
6358
6359 static struct mbuf *
6360 sctp_copy_out_all(struct uio *uio, int len)
6361 {
6362         struct mbuf *ret, *at;
6363         int left, willcpy, cancpy, error;
6364
6365         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6366         if (ret == NULL) {
6367                 /* TSNH */
6368                 return (NULL);
6369         }
6370         left = len;
6371         SCTP_BUF_LEN(ret) = 0;
6372         /* save space for the data chunk header */
6373         cancpy = M_TRAILINGSPACE(ret);
6374         willcpy = min(cancpy, left);
6375         at = ret;
6376         while (left > 0) {
6377                 /* Align data to the end */
6378                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6379                 if (error) {
6380         err_out_now:
6381                         sctp_m_freem(at);
6382                         return (NULL);
6383                 }
6384                 SCTP_BUF_LEN(at) = willcpy;
6385                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6386                 left -= willcpy;
6387                 if (left > 0) {
6388                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6389                         if (SCTP_BUF_NEXT(at) == NULL) {
6390                                 goto err_out_now;
6391                         }
6392                         at = SCTP_BUF_NEXT(at);
6393                         SCTP_BUF_LEN(at) = 0;
6394                         cancpy = M_TRAILINGSPACE(at);
6395                         willcpy = min(cancpy, left);
6396                 }
6397         }
6398         return (ret);
6399 }
6400
6401 static int
6402 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6403     struct sctp_sndrcvinfo *srcv)
6404 {
6405         int ret;
6406         struct sctp_copy_all *ca;
6407
6408         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6409             SCTP_M_COPYAL);
6410         if (ca == NULL) {
6411                 sctp_m_freem(m);
6412                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6413                 return (ENOMEM);
6414         }
6415         memset(ca, 0, sizeof(struct sctp_copy_all));
6416
6417         ca->inp = inp;
6418         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6419         /*
6420          * take off the sendall flag, it would be bad if we failed to do
6421          * this :-0
6422          */
6423         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6424         /* get length and mbuf chain */
6425         if (uio) {
6426                 ca->sndlen = uio->uio_resid;
6427                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6428                 if (ca->m == NULL) {
6429                         SCTP_FREE(ca, SCTP_M_COPYAL);
6430                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6431                         return (ENOMEM);
6432                 }
6433         } else {
6434                 /* Gather the length of the send */
6435                 struct mbuf *mat;
6436
6437                 mat = m;
6438                 ca->sndlen = 0;
6439                 while (m) {
6440                         ca->sndlen += SCTP_BUF_LEN(m);
6441                         m = SCTP_BUF_NEXT(m);
6442                 }
6443                 ca->m = mat;
6444         }
6445         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6446             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6447             SCTP_ASOC_ANY_STATE,
6448             (void *)ca, 0,
6449             sctp_sendall_completes, inp, 1);
6450         if (ret) {
6451                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6452                 SCTP_FREE(ca, SCTP_M_COPYAL);
6453                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6454                 return (EFAULT);
6455         }
6456         return (0);
6457 }
6458
6459
6460 void
6461 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6462 {
6463         struct sctp_tmit_chunk *chk, *nchk;
6464
6465         chk = TAILQ_FIRST(&asoc->control_send_queue);
6466         while (chk) {
6467                 nchk = TAILQ_NEXT(chk, sctp_next);
6468                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6469                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6470                         if (chk->data) {
6471                                 sctp_m_freem(chk->data);
6472                                 chk->data = NULL;
6473                         }
6474                         asoc->ctrl_queue_cnt--;
6475                         sctp_free_a_chunk(stcb, chk);
6476                 }
6477                 chk = nchk;
6478         }
6479 }
6480
6481 void
6482 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6483 {
6484         struct sctp_association *asoc;
6485         struct sctp_tmit_chunk *chk, *chk_tmp;
6486         struct sctp_asconf_chunk *acp;
6487
6488         asoc = &stcb->asoc;
6489         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6490             chk = chk_tmp) {
6491                 /* get next chk */
6492                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6493                 /* find SCTP_ASCONF chunk in queue */
6494                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6495                         if (chk->data) {
6496                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6497                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6498                                         /* Not Acked yet */
6499                                         break;
6500                                 }
6501                         }
6502                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6503                         if (chk->data) {
6504                                 sctp_m_freem(chk->data);
6505                                 chk->data = NULL;
6506                         }
6507                         asoc->ctrl_queue_cnt--;
6508                         sctp_free_a_chunk(stcb, chk);
6509                 }
6510         }
6511 }
6512
6513
6514 static void
6515 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6516
6517     struct sctp_association *asoc,
6518     struct sctp_tmit_chunk **data_list,
6519     int bundle_at,
6520     struct sctp_nets *net)
6521 {
6522         int i;
6523         struct sctp_tmit_chunk *tp1;
6524
6525         for (i = 0; i < bundle_at; i++) {
6526                 /* off of the send queue */
6527                 if (i) {
6528                         /*
6529                          * Any chunk NOT 0 you zap the time chunk 0 gets
6530                          * zapped or set based on if a RTO measurment is
6531                          * needed.
6532                          */
6533                         data_list[i]->do_rtt = 0;
6534                 }
6535                 /* record time */
6536                 data_list[i]->sent_rcv_time = net->last_sent_time;
6537                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6538                 TAILQ_REMOVE(&asoc->send_queue,
6539                     data_list[i],
6540                     sctp_next);
6541                 /* on to the sent queue */
6542                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6543                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6544                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6545                         struct sctp_tmit_chunk *tpp;
6546
6547                         /* need to move back */
6548         back_up_more:
6549                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6550                         if (tpp == NULL) {
6551                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6552                                 goto all_done;
6553                         }
6554                         tp1 = tpp;
6555                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6556                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6557                                 goto back_up_more;
6558                         }
6559                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6560                 } else {
6561                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6562                             data_list[i],
6563                             sctp_next);
6564                 }
6565 all_done:
6566                 /* This does not lower until the cum-ack passes it */
6567                 asoc->sent_queue_cnt++;
6568                 asoc->send_queue_cnt--;
6569                 if ((asoc->peers_rwnd <= 0) &&
6570                     (asoc->total_flight == 0) &&
6571                     (bundle_at == 1)) {
6572                         /* Mark the chunk as being a window probe */
6573                         SCTP_STAT_INCR(sctps_windowprobed);
6574                 }
6575 #ifdef SCTP_AUDITING_ENABLED
6576                 sctp_audit_log(0xC2, 3);
6577 #endif
6578                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6579                 data_list[i]->snd_count = 1;
6580                 data_list[i]->rec.data.chunk_was_revoked = 0;
6581                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6582                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6583                             data_list[i]->whoTo->flight_size,
6584                             data_list[i]->book_size,
6585                             (uintptr_t) data_list[i]->whoTo,
6586                             data_list[i]->rec.data.TSN_seq);
6587                 }
6588                 sctp_flight_size_increase(data_list[i]);
6589                 sctp_total_flight_increase(stcb, data_list[i]);
6590                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6591                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6592                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6593                 }
6594                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6595                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6596                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6597                         /* SWS sender side engages */
6598                         asoc->peers_rwnd = 0;
6599                 }
6600         }
6601 }
6602
6603 static void
6604 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6605 {
6606         struct sctp_tmit_chunk *chk, *nchk;
6607
6608         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6609             chk; chk = nchk) {
6610                 nchk = TAILQ_NEXT(chk, sctp_next);
6611                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6612                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6613                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6614                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6615                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6616                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6617                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6618                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6619                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6620                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6621                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6622                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6623                         /* Stray chunks must be cleaned up */
6624         clean_up_anyway:
6625                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6626                         if (chk->data) {
6627                                 sctp_m_freem(chk->data);
6628                                 chk->data = NULL;
6629                         }
6630                         asoc->ctrl_queue_cnt--;
6631                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6632                                 asoc->fwd_tsn_cnt--;
6633                         sctp_free_a_chunk(stcb, chk);
6634                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6635                         /* special handling, we must look into the param */
6636                         if (chk != asoc->str_reset) {
6637                                 goto clean_up_anyway;
6638                         }
6639                 }
6640         }
6641 }
6642
6643
6644 static int
6645 sctp_can_we_split_this(struct sctp_tcb *stcb,
6646     uint32_t length,
6647     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6648 {
6649         /*
6650          * Make a decision on if I should split a msg into multiple parts.
6651          * This is only asked of incomplete messages.
6652          */
6653         if (eeor_on) {
6654                 /*
6655                  * If we are doing EEOR we need to always send it if its the
6656                  * entire thing, since it might be all the guy is putting in
6657                  * the hopper.
6658                  */
6659                 if (goal_mtu >= length) {
6660                         /*-
6661                          * If we have data outstanding,
6662                          * we get another chance when the sack
6663                          * arrives to transmit - wait for more data
6664                          */
6665                         if (stcb->asoc.total_flight == 0) {
6666                                 /*
6667                                  * If nothing is in flight, we zero the
6668                                  * packet counter.
6669                                  */
6670                                 return (length);
6671                         }
6672                         return (0);
6673
6674                 } else {
6675                         /* You can fill the rest */
6676                         return (goal_mtu);
6677                 }
6678         }
6679         /*-
6680          * For those strange folk that make the send buffer
6681          * smaller than our fragmentation point, we can't
6682          * get a full msg in so we have to allow splitting.
6683          */
6684         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6685                 return (length);
6686         }
6687         if ((length <= goal_mtu) ||
6688             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6689                 /* Sub-optimial residual don't split in non-eeor mode. */
6690                 return (0);
6691         }
6692         /*
6693          * If we reach here length is larger than the goal_mtu. Do we wish
6694          * to split it for the sake of packet putting together?
6695          */
6696         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6697                 /* Its ok to split it */
6698                 return (min(goal_mtu, frag_point));
6699         }
6700         /* Nope, can't split */
6701         return (0);
6702
6703 }
6704
6705 static uint32_t
6706 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6707     struct sctp_stream_out *strq,
6708     uint32_t goal_mtu,
6709     uint32_t frag_point,
6710     int *locked,
6711     int *giveup,
6712     int eeor_mode,
6713     int *bail)
6714 {
6715         /* Move from the stream to the send_queue keeping track of the total */
6716         struct sctp_association *asoc;
6717         struct sctp_stream_queue_pending *sp;
6718         struct sctp_tmit_chunk *chk;
6719         struct sctp_data_chunk *dchkh;
6720         uint32_t to_move, length;
6721         uint8_t rcv_flags = 0;
6722         uint8_t some_taken;
6723         uint8_t send_lock_up = 0;
6724
6725         SCTP_TCB_LOCK_ASSERT(stcb);
6726         asoc = &stcb->asoc;
6727 one_more_time:
6728         /* sa_ignore FREED_MEMORY */
6729         sp = TAILQ_FIRST(&strq->outqueue);
6730         if (sp == NULL) {
6731                 *locked = 0;
6732                 if (send_lock_up == 0) {
6733                         SCTP_TCB_SEND_LOCK(stcb);
6734                         send_lock_up = 1;
6735                 }
6736                 sp = TAILQ_FIRST(&strq->outqueue);
6737                 if (sp) {
6738                         goto one_more_time;
6739                 }
6740                 if (strq->last_msg_incomplete) {
6741                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6742                             strq->stream_no,
6743                             strq->last_msg_incomplete);
6744                         strq->last_msg_incomplete = 0;
6745                 }
6746                 to_move = 0;
6747                 if (send_lock_up) {
6748                         SCTP_TCB_SEND_UNLOCK(stcb);
6749                         send_lock_up = 0;
6750                 }
6751                 goto out_of;
6752         }
6753         if ((sp->msg_is_complete) && (sp->length == 0)) {
6754                 if (sp->sender_all_done) {
6755                         /*
6756                          * We are doing differed cleanup. Last time through
6757                          * when we took all the data the sender_all_done was
6758                          * not set.
6759                          */
6760                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6761                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6762                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6763                                     sp->sender_all_done,
6764                                     sp->length,
6765                                     sp->msg_is_complete,
6766                                     sp->put_last_out,
6767                                     send_lock_up);
6768                         }
6769                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6770                                 SCTP_TCB_SEND_LOCK(stcb);
6771                                 send_lock_up = 1;
6772                         }
6773                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6774                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6775                         sctp_free_remote_addr(sp->net);
6776                         if (sp->data) {
6777                                 sctp_m_freem(sp->data);
6778                                 sp->data = NULL;
6779                         }
6780                         sctp_free_a_strmoq(stcb, sp);
6781                         /* we can't be locked to it */
6782                         *locked = 0;
6783                         stcb->asoc.locked_on_sending = NULL;
6784                         if (send_lock_up) {
6785                                 SCTP_TCB_SEND_UNLOCK(stcb);
6786                                 send_lock_up = 0;
6787                         }
6788                         /* back to get the next msg */
6789                         goto one_more_time;
6790                 } else {
6791                         /*
6792                          * sender just finished this but still holds a
6793                          * reference
6794                          */
6795                         *locked = 1;
6796                         *giveup = 1;
6797                         to_move = 0;
6798                         goto out_of;
6799                 }
6800         } else {
6801                 /* is there some to get */
6802                 if (sp->length == 0) {
6803                         /* no */
6804                         *locked = 1;
6805                         *giveup = 1;
6806                         to_move = 0;
6807                         goto out_of;
6808                 } else if (sp->discard_rest) {
6809                         if (send_lock_up == 0) {
6810                                 SCTP_TCB_SEND_LOCK(stcb);
6811                                 send_lock_up = 1;
6812                         }
6813                         /* Whack down the size */
6814                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6815                         if ((stcb->sctp_socket != NULL) && \
6816                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6817                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6818                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6819                         }
6820                         if (sp->data) {
6821                                 sctp_m_freem(sp->data);
6822                                 sp->data = NULL;
6823                                 sp->tail_mbuf = NULL;
6824                         }
6825                         sp->length = 0;
6826                         sp->some_taken = 1;
6827                         *locked = 1;
6828                         *giveup = 1;
6829                         to_move = 0;
6830                         goto out_of;
6831                 }
6832         }
6833         some_taken = sp->some_taken;
6834         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6835                 sp->msg_is_complete = 1;
6836         }
6837 re_look:
6838         length = sp->length;
6839         if (sp->msg_is_complete) {
6840                 /* The message is complete */
6841                 to_move = min(length, frag_point);
6842                 if (to_move == length) {
6843                         /* All of it fits in the MTU */
6844                         if (sp->some_taken) {
6845                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6846                                 sp->put_last_out = 1;
6847                         } else {
6848                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6849                                 sp->put_last_out = 1;
6850                         }
6851                 } else {
6852                         /* Not all of it fits, we fragment */
6853                         if (sp->some_taken == 0) {
6854                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6855                         }
6856                         sp->some_taken = 1;
6857                 }
6858         } else {
6859                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6860                 if (to_move) {
6861                         /*-
6862                          * We use a snapshot of length in case it
6863                          * is expanding during the compare.
6864                          */
6865                         uint32_t llen;
6866
6867                         llen = length;
6868                         if (to_move >= llen) {
6869                                 to_move = llen;
6870                                 if (send_lock_up == 0) {
6871                                         /*-
6872                                          * We are taking all of an incomplete msg
6873                                          * thus we need a send lock.
6874                                          */
6875                                         SCTP_TCB_SEND_LOCK(stcb);
6876                                         send_lock_up = 1;
6877                                         if (sp->msg_is_complete) {
6878                                                 /*
6879                                                  * the sender finished the
6880                                                  * msg
6881                                                  */
6882                                                 goto re_look;
6883                                         }
6884                                 }
6885                         }
6886                         if (sp->some_taken == 0) {
6887                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6888                                 sp->some_taken = 1;
6889                         }
6890                 } else {
6891                         /* Nothing to take. */
6892                         if (sp->some_taken) {
6893                                 *locked = 1;
6894                         }
6895                         *giveup = 1;
6896                         to_move = 0;
6897                         goto out_of;
6898                 }
6899         }
6900
6901         /* If we reach here, we can copy out a chunk */
6902         sctp_alloc_a_chunk(stcb, chk);
6903         if (chk == NULL) {
6904                 /* No chunk memory */
6905                 *giveup = 1;
6906                 to_move = 0;
6907                 goto out_of;
6908         }
6909         /*
6910          * Setup for unordered if needed by looking at the user sent info
6911          * flags.
6912          */
6913         if (sp->sinfo_flags & SCTP_UNORDERED) {
6914                 rcv_flags |= SCTP_DATA_UNORDERED;
6915         }
6916         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6917             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6918                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6919         }
6920         /* clear out the chunk before setting up */
6921         memset(chk, 0, sizeof(*chk));
6922         chk->rec.data.rcv_flags = rcv_flags;
6923
6924         if (to_move >= length) {
6925                 /* we think we can steal the whole thing */
6926                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6927                         SCTP_TCB_SEND_LOCK(stcb);
6928                         send_lock_up = 1;
6929                 }
6930                 if (to_move < sp->length) {
6931                         /* bail, it changed */
6932                         goto dont_do_it;
6933                 }
6934                 chk->data = sp->data;
6935                 chk->last_mbuf = sp->tail_mbuf;
6936                 /* register the stealing */
6937                 sp->data = sp->tail_mbuf = NULL;
6938         } else {
6939                 struct mbuf *m;
6940
6941 dont_do_it:
6942                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6943                 chk->last_mbuf = NULL;
6944                 if (chk->data == NULL) {
6945                         sp->some_taken = some_taken;
6946                         sctp_free_a_chunk(stcb, chk);
6947                         *bail = 1;
6948                         to_move = 0;
6949                         goto out_of;
6950                 }
6951 #ifdef SCTP_MBUF_LOGGING
6952                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6953                         struct mbuf *mat;
6954
6955                         mat = chk->data;
6956                         while (mat) {
6957                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6958                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6959                                 }
6960                                 mat = SCTP_BUF_NEXT(mat);
6961                         }
6962                 }
6963 #endif
6964                 /* Pull off the data */
6965                 m_adj(sp->data, to_move);
6966                 /* Now lets work our way down and compact it */
6967                 m = sp->data;
6968                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6969                         sp->data = SCTP_BUF_NEXT(m);
6970                         SCTP_BUF_NEXT(m) = NULL;
6971                         if (sp->tail_mbuf == m) {
6972                                 /*-
6973                                  * Freeing tail? TSNH since
6974                                  * we supposedly were taking less
6975                                  * than the sp->length.
6976                                  */
6977 #ifdef INVARIANTS
6978                                 panic("Huh, freing tail? - TSNH");
6979 #else
6980                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6981                                 sp->tail_mbuf = sp->data = NULL;
6982                                 sp->length = 0;
6983 #endif
6984
6985                         }
6986                         sctp_m_free(m);
6987                         m = sp->data;
6988                 }
6989         }
6990         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6991                 chk->copy_by_ref = 1;
6992         } else {
6993                 chk->copy_by_ref = 0;
6994         }
6995         /*
6996          * get last_mbuf and counts of mb useage This is ugly but hopefully
6997          * its only one mbuf.
6998          */
6999         if (chk->last_mbuf == NULL) {
7000                 chk->last_mbuf = chk->data;
7001                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7002                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7003                 }
7004         }
7005         if (to_move > length) {
7006                 /*- This should not happen either
7007                  * since we always lower to_move to the size
7008                  * of sp->length if its larger.
7009                  */
7010 #ifdef INVARIANTS
7011                 panic("Huh, how can to_move be larger?");
7012 #else
7013                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7014                 sp->length = 0;
7015 #endif
7016         } else {
7017                 atomic_subtract_int(&sp->length, to_move);
7018         }
7019         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7020                 /* Not enough room for a chunk header, get some */
7021                 struct mbuf *m;
7022
7023                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7024                 if (m == NULL) {
7025                         /*
7026                          * we're in trouble here. _PREPEND below will free
7027                          * all the data if there is no leading space, so we
7028                          * must put the data back and restore.
7029                          */
7030                         if (send_lock_up == 0) {
7031                                 SCTP_TCB_SEND_LOCK(stcb);
7032                                 send_lock_up = 1;
7033                         }
7034                         if (chk->data == NULL) {
7035                                 /* unsteal the data */
7036                                 sp->data = chk->data;
7037                                 sp->tail_mbuf = chk->last_mbuf;
7038                         } else {
7039                                 struct mbuf *m_tmp;
7040
7041                                 /* reassemble the data */
7042                                 m_tmp = sp->data;
7043                                 sp->data = chk->data;
7044                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7045                         }
7046                         sp->some_taken = some_taken;
7047                         atomic_add_int(&sp->length, to_move);
7048                         chk->data = NULL;
7049                         *bail = 1;
7050                         sctp_free_a_chunk(stcb, chk);
7051                         to_move = 0;
7052                         goto out_of;
7053                 } else {
7054                         SCTP_BUF_LEN(m) = 0;
7055                         SCTP_BUF_NEXT(m) = chk->data;
7056                         chk->data = m;
7057                         M_ALIGN(chk->data, 4);
7058                 }
7059         }
7060         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7061         if (chk->data == NULL) {
7062                 /* HELP, TSNH since we assured it would not above? */
7063 #ifdef INVARIANTS
7064                 panic("prepend failes HELP?");
7065 #else
7066                 SCTP_PRINTF("prepend fails HELP?\n");
7067                 sctp_free_a_chunk(stcb, chk);
7068 #endif
7069                 *bail = 1;
7070                 to_move = 0;
7071                 goto out_of;
7072         }
7073         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7074         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7075         chk->book_size_scale = 0;
7076         chk->sent = SCTP_DATAGRAM_UNSENT;
7077
7078         chk->flags = 0;
7079         chk->asoc = &stcb->asoc;
7080         chk->pad_inplace = 0;
7081         chk->no_fr_allowed = 0;
7082         chk->rec.data.stream_seq = sp->strseq;
7083         chk->rec.data.stream_number = sp->stream;
7084         chk->rec.data.payloadtype = sp->ppid;
7085         chk->rec.data.context = sp->context;
7086         chk->rec.data.doing_fast_retransmit = 0;
7087         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7088
7089         chk->rec.data.timetodrop = sp->ts;
7090         chk->flags = sp->act_flags;
7091
7092         chk->whoTo = net;
7093         atomic_add_int(&chk->whoTo->ref_count, 1);
7094
7095         if (sp->holds_key_ref) {
7096                 chk->auth_keyid = sp->auth_keyid;
7097                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7098                 chk->holds_key_ref = 1;
7099         }
7100         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7101         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7102                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7103                     (uintptr_t) stcb, sp->length,
7104                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7105                     chk->rec.data.TSN_seq);
7106         }
7107         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7108         /*
7109          * Put the rest of the things in place now. Size was done earlier in
7110          * previous loop prior to padding.
7111          */
7112
7113 #ifdef SCTP_ASOCLOG_OF_TSNS
7114         SCTP_TCB_LOCK_ASSERT(stcb);
7115         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7116                 asoc->tsn_out_at = 0;
7117                 asoc->tsn_out_wrapped = 1;
7118         }
7119         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7120         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7121         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7122         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7123         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7124         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7125         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7126         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7127         asoc->tsn_out_at++;
7128 #endif
7129
7130         dchkh->ch.chunk_type = SCTP_DATA;
7131         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7132         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7133         dchkh->dp.stream_id = htons(strq->stream_no);
7134         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7135         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7136         dchkh->ch.chunk_length = htons(chk->send_size);
7137         /* Now advance the chk->send_size by the actual pad needed. */
7138         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7139                 /* need a pad */
7140                 struct mbuf *lm;
7141                 int pads;
7142
7143                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7144                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7145                         chk->pad_inplace = 1;
7146                 }
7147                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7148                         /* pad added an mbuf */
7149                         chk->last_mbuf = lm;
7150                 }
7151                 chk->send_size += pads;
7152         }
7153         /* We only re-set the policy if it is on */
7154         if (sp->pr_sctp_on) {
7155                 sctp_set_prsctp_policy(sp);
7156                 asoc->pr_sctp_cnt++;
7157                 chk->pr_sctp_on = 1;
7158         } else {
7159                 chk->pr_sctp_on = 0;
7160         }
7161         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7162                 /* All done pull and kill the message */
7163                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7164                 if (sp->put_last_out == 0) {
7165                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7166                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7167                             sp->sender_all_done,
7168                             sp->length,
7169                             sp->msg_is_complete,
7170                             sp->put_last_out,
7171                             send_lock_up);
7172                 }
7173                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7174                         SCTP_TCB_SEND_LOCK(stcb);
7175                         send_lock_up = 1;
7176                 }
7177                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7178                 sctp_free_remote_addr(sp->net);
7179                 if (sp->data) {
7180                         sctp_m_freem(sp->data);
7181                         sp->data = NULL;
7182                 }
7183                 sctp_free_a_strmoq(stcb, sp);
7184
7185                 /* we can't be locked to it */
7186                 *locked = 0;
7187                 stcb->asoc.locked_on_sending = NULL;
7188         } else {
7189                 /* more to go, we are locked */
7190                 *locked = 1;
7191         }
7192         asoc->chunks_on_out_queue++;
7193         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7194         asoc->send_queue_cnt++;
7195 out_of:
7196         if (send_lock_up) {
7197                 SCTP_TCB_SEND_UNLOCK(stcb);
7198                 send_lock_up = 0;
7199         }
7200         return (to_move);
7201 }
7202
7203
7204 static struct sctp_stream_out *
7205 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7206 {
7207         struct sctp_stream_out *strq;
7208
7209         /* Find the next stream to use */
7210         if (asoc->last_out_stream == NULL) {
7211                 strq = TAILQ_FIRST(&asoc->out_wheel);
7212         } else {
7213                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7214                 if (strq == NULL) {
7215                         strq = TAILQ_FIRST(&asoc->out_wheel);
7216                 }
7217         }
7218         return (strq);
7219 }
7220
7221
7222 static void
7223 sctp_fill_outqueue(struct sctp_tcb *stcb,
7224     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7225 {
7226         struct sctp_association *asoc;
7227         struct sctp_stream_out *strq, *strqn;
7228         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7229         int locked, giveup;
7230         struct sctp_stream_queue_pending *sp;
7231
7232         SCTP_TCB_LOCK_ASSERT(stcb);
7233         asoc = &stcb->asoc;
7234 #ifdef INET6
7235         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7236                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7237         } else {
7238                 /* ?? not sure what else to do */
7239                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7240         }
7241 #else
7242         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7243 #endif
7244         /* Need an allowance for the data chunk header too */
7245         goal_mtu -= sizeof(struct sctp_data_chunk);
7246
7247         /* must make even word boundary */
7248         goal_mtu &= 0xfffffffc;
7249         if (asoc->locked_on_sending) {
7250                 /* We are stuck on one stream until the message completes. */
7251                 strqn = strq = asoc->locked_on_sending;
7252                 locked = 1;
7253         } else {
7254                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7255                 locked = 0;
7256         }
7257
7258         while ((goal_mtu > 0) && strq) {
7259                 sp = TAILQ_FIRST(&strq->outqueue);
7260                 /*
7261                  * If CMT is off, we must validate that the stream in
7262                  * question has the first item pointed towards are network
7263                  * destionation requested by the caller. Note that if we
7264                  * turn out to be locked to a stream (assigning TSN's then
7265                  * we must stop, since we cannot look for another stream
7266                  * with data to send to that destination). In CMT's case, by
7267                  * skipping this check, we will send one data packet towards
7268                  * the requested net.
7269                  */
7270                 if (sp == NULL) {
7271                         break;
7272                 }
7273                 if ((sp->net != net) &&
7274                     (asoc->sctp_cmt_on_off == 0)) {
7275                         /* none for this network */
7276                         if (locked) {
7277                                 break;
7278                         } else {
7279                                 strq = sctp_select_a_stream(stcb, asoc);
7280                                 if (strq == NULL)
7281                                         /* none left */
7282                                         break;
7283                                 if (strqn == strq) {
7284                                         /* I have circled */
7285                                         break;
7286                                 }
7287                                 continue;
7288                         }
7289                 }
7290                 giveup = 0;
7291                 bail = 0;
7292                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7293                     &giveup, eeor_mode, &bail);
7294                 if (moved_how_much)
7295                         asoc->last_out_stream = strq;
7296
7297                 if (locked) {
7298                         asoc->locked_on_sending = strq;
7299                         if ((moved_how_much == 0) || (giveup) || bail)
7300                                 /* no more to move for now */
7301                                 break;
7302                 } else {
7303                         asoc->locked_on_sending = NULL;
7304                         if (TAILQ_EMPTY(&strq->outqueue)) {
7305                                 if (strq == strqn) {
7306                                         /* Must move start to next one */
7307                                         strqn = TAILQ_NEXT(strq, next_spoke);
7308                                         if (strqn == NULL) {
7309                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7310                                                 if (strqn == NULL) {
7311                                                         break;
7312                                                 }
7313                                         }
7314                                 }
7315                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7316                         }
7317                         if ((giveup) || bail) {
7318                                 break;
7319                         }
7320                         strq = sctp_select_a_stream(stcb, asoc);
7321                         if (strq == NULL) {
7322                                 break;
7323                         }
7324                 }
7325                 total_moved += moved_how_much;
7326                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7327                 goal_mtu &= 0xfffffffc;
7328         }
7329         if (bail)
7330                 *quit_now = 1;
7331
7332         if (total_moved == 0) {
7333                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7334                     (net == stcb->asoc.primary_destination)) {
7335                         /* ran dry for primary network net */
7336                         SCTP_STAT_INCR(sctps_primary_randry);
7337                 } else if (stcb->asoc.sctp_cmt_on_off == 1) {
7338                         /* ran dry with CMT on */
7339                         SCTP_STAT_INCR(sctps_cmt_randry);
7340                 }
7341         }
7342 }
7343
7344 void
7345 sctp_fix_ecn_echo(struct sctp_association *asoc)
7346 {
7347         struct sctp_tmit_chunk *chk;
7348
7349         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7350                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7351                         chk->sent = SCTP_DATAGRAM_UNSENT;
7352                 }
7353         }
7354 }
7355
7356 static void
7357 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7358     struct sctp_association *asoc,
7359     struct sctp_nets *net)
7360 {
7361         struct sctp_tmit_chunk *chk;
7362         struct sctp_nets *a_net;
7363
7364         SCTP_TCB_LOCK_ASSERT(stcb);
7365         /*
7366          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7367          * destination using the PF algorithm for finding alternate
7368          * destinations.
7369          */
7370         if ((asoc->sctp_cmt_on_off == 1) &&
7371             (asoc->sctp_cmt_pf > 0)) {
7372                 a_net = sctp_find_alternate_net(stcb, net, 2);
7373         } else {
7374                 a_net = sctp_find_alternate_net(stcb, net, 0);
7375         }
7376         if ((a_net != net) &&
7377             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7378                 /*
7379                  * We only proceed if a valid alternate is found that is not
7380                  * this one and is reachable. Here we must move all chunks
7381                  * queued in the send queue off of the destination address
7382                  * to our alternate.
7383                  */
7384                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7385                         if (chk->whoTo == net) {
7386                                 /* Move the chunk to our alternate */
7387                                 sctp_free_remote_addr(chk->whoTo);
7388                                 chk->whoTo = a_net;
7389                                 atomic_add_int(&a_net->ref_count, 1);
7390                         }
7391                 }
7392         }
7393 }
7394
7395 int
7396 sctp_med_chunk_output(struct sctp_inpcb *inp,
7397     struct sctp_tcb *stcb,
7398     struct sctp_association *asoc,
7399     int *num_out,
7400     int *reason_code,
7401     int control_only, int from_where,
7402     struct timeval *now, int *now_filled, int frag_point, int so_locked
7403 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7404     SCTP_UNUSED
7405 #endif
7406 )
7407 {
7408         /*
7409          * Ok this is the generic chunk service queue. we must do the
7410          * following: - Service the stream queue that is next, moving any
7411          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7412          * LAST to the out queue in one pass) and assigning TSN's - Check to
7413          * see if the cwnd/rwnd allows any output, if so we go ahead and
7414          * fomulate and send the low level chunks. Making sure to combine
7415          * any control in the control chunk queue also.
7416          */
7417         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7418         struct mbuf *outchain, *endoutchain;
7419         struct sctp_tmit_chunk *chk, *nchk;
7420
7421         /* temp arrays for unlinking */
7422         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7423         int no_fragmentflg, error;
7424         unsigned int max_rwnd_per_dest;
7425         int one_chunk, hbflag, skip_data_for_this_net;
7426         int asconf, cookie, no_out_cnt;
7427         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7428         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7429         int tsns_sent = 0;
7430         uint32_t auth_offset = 0;
7431         struct sctp_auth_chunk *auth = NULL;
7432         uint16_t auth_keyid;
7433         int override_ok = 1;
7434         int data_auth_reqd = 0;
7435
7436         /*
7437          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7438          * destination.
7439          */
7440         int pf_hbflag = 0;
7441         int quit_now = 0;
7442
7443         *num_out = 0;
7444         auth_keyid = stcb->asoc.authinfo.active_keyid;
7445
7446         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7447             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7448             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7449                 eeor_mode = 1;
7450         } else {
7451                 eeor_mode = 0;
7452         }
7453         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7454         /*
7455          * First lets prime the pump. For each destination, if there is room
7456          * in the flight size, attempt to pull an MTU's worth out of the
7457          * stream queues into the general send_queue
7458          */
7459 #ifdef SCTP_AUDITING_ENABLED
7460         sctp_audit_log(0xC2, 2);
7461 #endif
7462         SCTP_TCB_LOCK_ASSERT(stcb);
7463         hbflag = 0;
7464         if ((control_only) || (asoc->stream_reset_outstanding))
7465                 no_data_chunks = 1;
7466         else
7467                 no_data_chunks = 0;
7468
7469         /* Nothing to possible to send? */
7470         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7471             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7472             TAILQ_EMPTY(&asoc->send_queue) &&
7473             TAILQ_EMPTY(&asoc->out_wheel)) {
7474                 *reason_code = 9;
7475                 return (0);
7476         }
7477         if (asoc->peers_rwnd == 0) {
7478                 /* No room in peers rwnd */
7479                 *reason_code = 1;
7480                 if (asoc->total_flight > 0) {
7481                         /* we are allowed one chunk in flight */
7482                         no_data_chunks = 1;
7483                 }
7484         }
7485         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7486         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7487                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7488                         /*
7489                          * This for loop we are in takes in each net, if
7490                          * its's got space in cwnd and has data sent to it
7491                          * (when CMT is off) then it calls
7492                          * sctp_fill_outqueue for the net. This gets data on
7493                          * the send queue for that network.
7494                          *
7495                          * In sctp_fill_outqueue TSN's are assigned and data is
7496                          * copied out of the stream buffers. Note mostly
7497                          * copy by reference (we hope).
7498                          */
7499                         net->window_probe = 0;
7500                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7501                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7502                                         sctp_log_cwnd(stcb, net, 1,
7503                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7504                                 }
7505                                 continue;
7506                         }
7507                         if ((asoc->sctp_cmt_on_off == 0) &&
7508                             (net->ref_count < 2)) {
7509                                 /* nothing can be in queue for this guy */
7510                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7511                                         sctp_log_cwnd(stcb, net, 2,
7512                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7513                                 }
7514                                 continue;
7515                         }
7516                         if (net->flight_size >= net->cwnd) {
7517                                 /* skip this network, no room - can't fill */
7518                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7519                                         sctp_log_cwnd(stcb, net, 3,
7520                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7521                                 }
7522                                 continue;
7523                         }
7524                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7525                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7526                         }
7527                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7528                         if (quit_now) {
7529                                 /* memory alloc failure */
7530                                 no_data_chunks = 1;
7531                                 break;
7532                         }
7533                 }
7534         }
7535         /* now service each destination and send out what we can for it */
7536         /* Nothing to send? */
7537         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7538             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7539             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7540                 *reason_code = 8;
7541                 return (0);
7542         }
7543         if (asoc->sctp_cmt_on_off == 1) {
7544                 /* get the last start point */
7545                 start_at = asoc->last_net_cmt_send_started;
7546                 if (start_at == NULL) {
7547                         /* null so to beginning */
7548                         start_at = TAILQ_FIRST(&asoc->nets);
7549                 } else {
7550                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7551                         if (start_at == NULL) {
7552                                 start_at = TAILQ_FIRST(&asoc->nets);
7553                         }
7554                 }
7555                 asoc->last_net_cmt_send_started = start_at;
7556         } else {
7557                 start_at = TAILQ_FIRST(&asoc->nets);
7558         }
7559         old_start_at = NULL;
7560 again_one_more_time:
7561         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7562                 /* how much can we send? */
7563                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7564                 if (old_start_at && (old_start_at == net)) {
7565                         /* through list ocmpletely. */
7566                         break;
7567                 }
7568                 tsns_sent = 0xa;
7569                 if ((asoc->sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
7570                         /*
7571                          * Ref-count of 1 so we cannot have data or control
7572                          * queued to this address. Skip it (non-CMT).
7573                          */
7574                         continue;
7575                 }
7576                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7577                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7578                     (net->flight_size >= net->cwnd)) {
7579                         /*
7580                          * Nothing on control or asconf and flight is full,
7581                          * we can skip even in the CMT case.
7582                          */
7583                         continue;
7584                 }
7585                 ctl_cnt = bundle_at = 0;
7586                 endoutchain = outchain = NULL;
7587                 no_fragmentflg = 1;
7588                 one_chunk = 0;
7589                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7590                         skip_data_for_this_net = 1;
7591                 } else {
7592                         skip_data_for_this_net = 0;
7593                 }
7594                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7595                         /*
7596                          * if we have a route and an ifp check to see if we
7597                          * have room to send to this guy
7598                          */
7599                         struct ifnet *ifp;
7600
7601                         ifp = net->ro.ro_rt->rt_ifp;
7602                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7603                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7604                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7605                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7606                                 }
7607                                 continue;
7608                         }
7609                 }
7610                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7611                 case AF_INET:
7612                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7613                         break;
7614 #ifdef INET6
7615                 case AF_INET6:
7616                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7617                         break;
7618 #endif
7619                 default:
7620                         /* TSNH */
7621                         mtu = net->mtu;
7622                         break;
7623                 }
7624                 mx_mtu = mtu;
7625                 to_out = 0;
7626                 if (mtu > asoc->peers_rwnd) {
7627                         if (asoc->total_flight > 0) {
7628                                 /* We have a packet in flight somewhere */
7629                                 r_mtu = asoc->peers_rwnd;
7630                         } else {
7631                                 /* We are always allowed to send one MTU out */
7632                                 one_chunk = 1;
7633                                 r_mtu = mtu;
7634                         }
7635                 } else {
7636                         r_mtu = mtu;
7637                 }
7638                 /************************/
7639                 /* ASCONF transmission */
7640                 /************************/
7641                 /* Now first lets go through the asconf queue */
7642                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7643                     chk; chk = nchk) {
7644                         nchk = TAILQ_NEXT(chk, sctp_next);
7645                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7646                                 continue;
7647                         }
7648                         if (chk->whoTo != net) {
7649                                 /*
7650                                  * No, not sent to the network we are
7651                                  * looking at
7652                                  */
7653                                 break;
7654                         }
7655                         if (chk->data == NULL) {
7656                                 break;
7657                         }
7658                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7659                             chk->sent != SCTP_DATAGRAM_RESEND) {
7660                                 break;
7661                         }
7662                         /*
7663                          * if no AUTH is yet included and this chunk
7664                          * requires it, make sure to account for it.  We
7665                          * don't apply the size until the AUTH chunk is
7666                          * actually added below in case there is no room for
7667                          * this chunk. NOTE: we overload the use of "omtu"
7668                          * here
7669                          */
7670                         if ((auth == NULL) &&
7671                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7672                             stcb->asoc.peer_auth_chunks)) {
7673                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7674                         } else
7675                                 omtu = 0;
7676                         /* Here we do NOT factor the r_mtu */
7677                         if ((chk->send_size < (int)(mtu - omtu)) ||
7678                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7679                                 /*
7680                                  * We probably should glom the mbuf chain
7681                                  * from the chk->data for control but the
7682                                  * problem is it becomes yet one more level
7683                                  * of tracking to do if for some reason
7684                                  * output fails. Then I have got to
7685                                  * reconstruct the merged control chain.. el
7686                                  * yucko.. for now we take the easy way and
7687                                  * do the copy
7688                                  */
7689                                 /*
7690                                  * Add an AUTH chunk, if chunk requires it
7691                                  * save the offset into the chain for AUTH
7692                                  */
7693                                 if ((auth == NULL) &&
7694                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7695                                     stcb->asoc.peer_auth_chunks))) {
7696                                         outchain = sctp_add_auth_chunk(outchain,
7697                                             &endoutchain,
7698                                             &auth,
7699                                             &auth_offset,
7700                                             stcb,
7701                                             chk->rec.chunk_id.id);
7702                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7703                                 }
7704                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7705                                     (int)chk->rec.chunk_id.can_take_data,
7706                                     chk->send_size, chk->copy_by_ref);
7707                                 if (outchain == NULL) {
7708                                         *reason_code = 8;
7709                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7710                                         return (ENOMEM);
7711                                 }
7712                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7713                                 /* update our MTU size */
7714                                 if (mtu > (chk->send_size + omtu))
7715                                         mtu -= (chk->send_size + omtu);
7716                                 else
7717                                         mtu = 0;
7718                                 to_out += (chk->send_size + omtu);
7719                                 /* Do clear IP_DF ? */
7720                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7721                                         no_fragmentflg = 0;
7722                                 }
7723                                 if (chk->rec.chunk_id.can_take_data)
7724                                         chk->data = NULL;
7725                                 /*
7726                                  * set hb flag since we can use these for
7727                                  * RTO
7728                                  */
7729                                 hbflag = 1;
7730                                 asconf = 1;
7731                                 /*
7732                                  * should sysctl this: don't bundle data
7733                                  * with ASCONF since it requires AUTH
7734                                  */
7735                                 no_data_chunks = 1;
7736                                 chk->sent = SCTP_DATAGRAM_SENT;
7737                                 chk->snd_count++;
7738                                 if (mtu == 0) {
7739                                         /*
7740                                          * Ok we are out of room but we can
7741                                          * output without effecting the
7742                                          * flight size since this little guy
7743                                          * is a control only packet.
7744                                          */
7745                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7746                                         /*
7747                                          * do NOT clear the asconf flag as
7748                                          * it is used to do appropriate
7749                                          * source address selection.
7750                                          */
7751                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7752                                             (struct sockaddr *)&net->ro._l_addr,
7753                                             outchain, auth_offset, auth,
7754                                             stcb->asoc.authinfo.active_keyid,
7755                                             no_fragmentflg, 0, NULL, asconf,
7756                                             inp->sctp_lport, stcb->rport,
7757                                             htonl(stcb->asoc.peer_vtag),
7758                                             net->port, so_locked, NULL))) {
7759                                                 if (error == ENOBUFS) {
7760                                                         asoc->ifp_had_enobuf = 1;
7761                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7762                                                 }
7763                                                 if (from_where == 0) {
7764                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7765                                                 }
7766                                                 if (*now_filled == 0) {
7767                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7768                                                         *now_filled = 1;
7769                                                         *now = net->last_sent_time;
7770                                                 } else {
7771                                                         net->last_sent_time = *now;
7772                                                 }
7773                                                 hbflag = 0;
7774                                                 /* error, could not output */
7775                                                 if (error == EHOSTUNREACH) {
7776                                                         /*
7777                                                          * Destination went
7778                                                          * unreachable
7779                                                          * during this send
7780                                                          */
7781                                                         sctp_move_to_an_alt(stcb, asoc, net);
7782                                                 }
7783                                                 *reason_code = 7;
7784                                                 continue;
7785                                         } else
7786                                                 asoc->ifp_had_enobuf = 0;
7787                                         if (*now_filled == 0) {
7788                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7789                                                 *now_filled = 1;
7790                                                 *now = net->last_sent_time;
7791                                         } else {
7792                                                 net->last_sent_time = *now;
7793                                         }
7794                                         hbflag = 0;
7795                                         /*
7796                                          * increase the number we sent, if a
7797                                          * cookie is sent we don't tell them
7798                                          * any was sent out.
7799                                          */
7800                                         outchain = endoutchain = NULL;
7801                                         auth = NULL;
7802                                         auth_offset = 0;
7803                                         if (!no_out_cnt)
7804                                                 *num_out += ctl_cnt;
7805                                         /* recalc a clean slate and setup */
7806                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7807                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7808                                         } else {
7809                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7810                                         }
7811                                         to_out = 0;
7812                                         no_fragmentflg = 1;
7813                                 }
7814                         }
7815                 }
7816                 /************************/
7817                 /* Control transmission */
7818                 /************************/
7819                 /* Now first lets go through the control queue */
7820                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7821                     chk; chk = nchk) {
7822                         nchk = TAILQ_NEXT(chk, sctp_next);
7823                         if (chk->whoTo != net) {
7824                                 /*
7825                                  * No, not sent to the network we are
7826                                  * looking at
7827                                  */
7828                                 continue;
7829                         }
7830                         if (chk->data == NULL) {
7831                                 continue;
7832                         }
7833                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7834                                 /*
7835                                  * It must be unsent. Cookies and ASCONF's
7836                                  * hang around but there timers will force
7837                                  * when marked for resend.
7838                                  */
7839                                 continue;
7840                         }
7841                         /*
7842                          * if no AUTH is yet included and this chunk
7843                          * requires it, make sure to account for it.  We
7844                          * don't apply the size until the AUTH chunk is
7845                          * actually added below in case there is no room for
7846                          * this chunk. NOTE: we overload the use of "omtu"
7847                          * here
7848                          */
7849                         if ((auth == NULL) &&
7850                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7851                             stcb->asoc.peer_auth_chunks)) {
7852                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7853                         } else
7854                                 omtu = 0;
7855                         /* Here we do NOT factor the r_mtu */
7856                         if ((chk->send_size <= (int)(mtu - omtu)) ||
7857                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7858                                 /*
7859                                  * We probably should glom the mbuf chain
7860                                  * from the chk->data for control but the
7861                                  * problem is it becomes yet one more level
7862                                  * of tracking to do if for some reason
7863                                  * output fails. Then I have got to
7864                                  * reconstruct the merged control chain.. el
7865                                  * yucko.. for now we take the easy way and
7866                                  * do the copy
7867                                  */
7868                                 /*
7869                                  * Add an AUTH chunk, if chunk requires it
7870                                  * save the offset into the chain for AUTH
7871                                  */
7872                                 if ((auth == NULL) &&
7873                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7874                                     stcb->asoc.peer_auth_chunks))) {
7875                                         outchain = sctp_add_auth_chunk(outchain,
7876                                             &endoutchain,
7877                                             &auth,
7878                                             &auth_offset,
7879                                             stcb,
7880                                             chk->rec.chunk_id.id);
7881                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7882                                 }
7883                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7884                                     (int)chk->rec.chunk_id.can_take_data,
7885                                     chk->send_size, chk->copy_by_ref);
7886                                 if (outchain == NULL) {
7887                                         *reason_code = 8;
7888                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7889                                         return (ENOMEM);
7890                                 }
7891                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7892                                 /* update our MTU size */
7893                                 if (mtu > (chk->send_size + omtu))
7894                                         mtu -= (chk->send_size + omtu);
7895                                 else
7896                                         mtu = 0;
7897                                 to_out += (chk->send_size + omtu);
7898                                 /* Do clear IP_DF ? */
7899                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7900                                         no_fragmentflg = 0;
7901                                 }
7902                                 if (chk->rec.chunk_id.can_take_data)
7903                                         chk->data = NULL;
7904                                 /* Mark things to be removed, if needed */
7905                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7906                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7907                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7908                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7909                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7910                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7911                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7912                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7913                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7914                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7915                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7916
7917                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7918                                                 hbflag = 1;
7919                                                 /*
7920                                                  * JRS 5/14/07 - Set the
7921                                                  * flag to say a heartbeat
7922                                                  * is being sent.
7923                                                  */
7924                                                 pf_hbflag = 1;
7925                                         }
7926                                         /* remove these chunks at the end */
7927                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7928                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7929                                                 /* turn off the timer */
7930                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7931                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7932                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7933                                                 }
7934                                         }
7935                                         ctl_cnt++;
7936                                 } else {
7937                                         /*
7938                                          * Other chunks, since they have
7939                                          * timers running (i.e. COOKIE) we
7940                                          * just "trust" that it gets sent or
7941                                          * retransmitted.
7942                                          */
7943                                         ctl_cnt++;
7944                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7945                                                 cookie = 1;
7946                                                 no_out_cnt = 1;
7947                                         }
7948                                         chk->sent = SCTP_DATAGRAM_SENT;
7949                                         chk->snd_count++;
7950                                 }
7951                                 if (mtu == 0) {
7952                                         /*
7953                                          * Ok we are out of room but we can
7954                                          * output without effecting the
7955                                          * flight size since this little guy
7956                                          * is a control only packet.
7957                                          */
7958                                         if (asconf) {
7959                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7960                                                 /*
7961                                                  * do NOT clear the asconf
7962                                                  * flag as it is used to do
7963                                                  * appropriate source
7964                                                  * address selection.
7965                                                  */
7966                                         }
7967                                         if (cookie) {
7968                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7969                                                 cookie = 0;
7970                                         }
7971                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7972                                             (struct sockaddr *)&net->ro._l_addr,
7973                                             outchain,
7974                                             auth_offset, auth,
7975                                             stcb->asoc.authinfo.active_keyid,
7976                                             no_fragmentflg, 0, NULL, asconf,
7977                                             inp->sctp_lport, stcb->rport,
7978                                             htonl(stcb->asoc.peer_vtag),
7979                                             net->port, so_locked, NULL))) {
7980                                                 if (error == ENOBUFS) {
7981                                                         asoc->ifp_had_enobuf = 1;
7982                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7983                                                 }
7984                                                 if (from_where == 0) {
7985                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7986                                                 }
7987                                                 /* error, could not output */
7988                                                 if (hbflag) {
7989                                                         if (*now_filled == 0) {
7990                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7991                                                                 *now_filled = 1;
7992                                                                 *now = net->last_sent_time;
7993                                                         } else {
7994                                                                 net->last_sent_time = *now;
7995                                                         }
7996                                                         hbflag = 0;
7997                                                 }
7998                                                 if (error == EHOSTUNREACH) {
7999                                                         /*
8000                                                          * Destination went
8001                                                          * unreachable
8002                                                          * during this send
8003                                                          */
8004                                                         sctp_move_to_an_alt(stcb, asoc, net);
8005                                                 }
8006                                                 *reason_code = 7;
8007                                                 continue;
8008                                         } else
8009                                                 asoc->ifp_had_enobuf = 0;
8010                                         /* Only HB or ASCONF advances time */
8011                                         if (hbflag) {
8012                                                 if (*now_filled == 0) {
8013                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8014                                                         *now_filled = 1;
8015                                                         *now = net->last_sent_time;
8016                                                 } else {
8017                                                         net->last_sent_time = *now;
8018                                                 }
8019                                                 hbflag = 0;
8020                                         }
8021                                         /*
8022                                          * increase the number we sent, if a
8023                                          * cookie is sent we don't tell them
8024                                          * any was sent out.
8025                                          */
8026                                         outchain = endoutchain = NULL;
8027                                         auth = NULL;
8028                                         auth_offset = 0;
8029                                         if (!no_out_cnt)
8030                                                 *num_out += ctl_cnt;
8031                                         /* recalc a clean slate and setup */
8032                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8033                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8034                                         } else {
8035                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8036                                         }
8037                                         to_out = 0;
8038                                         no_fragmentflg = 1;
8039                                 }
8040                         }
8041                 }
8042                 /* JRI: if dest is in PF state, do not send data to it */
8043                 if ((asoc->sctp_cmt_on_off == 1) &&
8044                     (asoc->sctp_cmt_pf > 0) &&
8045                     (net->dest_state & SCTP_ADDR_PF)) {
8046                         goto no_data_fill;
8047                 }
8048                 if (net->flight_size >= net->cwnd) {
8049                         goto no_data_fill;
8050                 }
8051                 if ((asoc->sctp_cmt_on_off == 1) &&
8052                     (net->flight_size > max_rwnd_per_dest)) {
8053                         goto no_data_fill;
8054                 }
8055                 /*********************/
8056                 /* Data transmission */
8057                 /*********************/
8058                 /*
8059                  * if AUTH for DATA is required and no AUTH has been added
8060                  * yet, account for this in the mtu now... if no data can be
8061                  * bundled, this adjustment won't matter anyways since the
8062                  * packet will be going out...
8063                  */
8064                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8065                     stcb->asoc.peer_auth_chunks);
8066                 if (data_auth_reqd && (auth == NULL)) {
8067                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8068                 }
8069                 /* now lets add any data within the MTU constraints */
8070                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8071                 case AF_INET:
8072                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8073                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8074                         else
8075                                 omtu = 0;
8076                         break;
8077 #ifdef INET6
8078                 case AF_INET6:
8079                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8080                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8081                         else
8082                                 omtu = 0;
8083                         break;
8084 #endif
8085                 default:
8086                         /* TSNH */
8087                         omtu = 0;
8088                         break;
8089                 }
8090                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8091                     (skip_data_for_this_net == 0)) ||
8092                     (cookie)) {
8093                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8094                                 if (no_data_chunks) {
8095                                         /* let only control go out */
8096                                         *reason_code = 1;
8097                                         break;
8098                                 }
8099                                 if (net->flight_size >= net->cwnd) {
8100                                         /* skip this net, no room for data */
8101                                         *reason_code = 2;
8102                                         break;
8103                                 }
8104                                 nchk = TAILQ_NEXT(chk, sctp_next);
8105                                 if (asoc->sctp_cmt_on_off == 1) {
8106                                         if (chk->whoTo != net) {
8107                                                 /*
8108                                                  * For CMT, steal the data
8109                                                  * to this network if its
8110                                                  * not set here.
8111                                                  */
8112                                                 sctp_free_remote_addr(chk->whoTo);
8113                                                 chk->whoTo = net;
8114                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8115                                         }
8116                                 } else if (chk->whoTo != net) {
8117                                         /* No, not sent to this net */
8118                                         continue;
8119                                 }
8120                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8121                                         /*-
8122                                          * strange, we have a chunk that is
8123                                          * to big for its destination and
8124                                          * yet no fragment ok flag.
8125                                          * Something went wrong when the
8126                                          * PMTU changed...we did not mark
8127                                          * this chunk for some reason?? I
8128                                          * will fix it here by letting IP
8129                                          * fragment it for now and printing
8130                                          * a warning. This really should not
8131                                          * happen ...
8132                                          */
8133                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8134                                             chk->send_size, mtu);
8135                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8136                                 }
8137                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8138                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8139                                         struct sctp_data_chunk *dchkh;
8140
8141                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8142                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8143                                 }
8144                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8145                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8146                                         /* ok we will add this one */
8147
8148                                         /*
8149                                          * Add an AUTH chunk, if chunk
8150                                          * requires it, save the offset into
8151                                          * the chain for AUTH
8152                                          */
8153                                         if (data_auth_reqd) {
8154                                                 if (auth == NULL) {
8155                                                         outchain = sctp_add_auth_chunk(outchain,
8156                                                             &endoutchain,
8157                                                             &auth,
8158                                                             &auth_offset,
8159                                                             stcb,
8160                                                             SCTP_DATA);
8161                                                         auth_keyid = chk->auth_keyid;
8162                                                         override_ok = 0;
8163                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8164                                                 } else if (override_ok) {
8165                                                         /*
8166                                                          * use this data's
8167                                                          * keyid
8168                                                          */
8169                                                         auth_keyid = chk->auth_keyid;
8170                                                         override_ok = 0;
8171                                                 } else if (auth_keyid != chk->auth_keyid) {
8172                                                         /*
8173                                                          * different keyid,
8174                                                          * so done bundling
8175                                                          */
8176                                                         break;
8177                                                 }
8178                                         }
8179                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8180                                             chk->send_size, chk->copy_by_ref);
8181                                         if (outchain == NULL) {
8182                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8183                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8184                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8185                                                 }
8186                                                 *reason_code = 3;
8187                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8188                                                 return (ENOMEM);
8189                                         }
8190                                         /* upate our MTU size */
8191                                         /* Do clear IP_DF ? */
8192                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8193                                                 no_fragmentflg = 0;
8194                                         }
8195                                         /* unsigned subtraction of mtu */
8196                                         if (mtu > chk->send_size)
8197                                                 mtu -= chk->send_size;
8198                                         else
8199                                                 mtu = 0;
8200                                         /* unsigned subtraction of r_mtu */
8201                                         if (r_mtu > chk->send_size)
8202                                                 r_mtu -= chk->send_size;
8203                                         else
8204                                                 r_mtu = 0;
8205
8206                                         to_out += chk->send_size;
8207                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8208 #ifdef INVARIANTS
8209                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8210 #else
8211                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8212                                                     mx_mtu, to_out);
8213 #endif
8214                                         }
8215                                         chk->window_probe = 0;
8216                                         data_list[bundle_at++] = chk;
8217                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8218                                                 mtu = 0;
8219                                                 break;
8220                                         }
8221                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8222                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8223                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8224                                                 } else {
8225                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8226                                                 }
8227                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8228                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8229                                                         /*
8230                                                          * Count number of
8231                                                          * user msg's that
8232                                                          * were fragmented
8233                                                          * we do this by
8234                                                          * counting when we
8235                                                          * see a LAST
8236                                                          * fragment only.
8237                                                          */
8238                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8239                                         }
8240                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8241                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8242                                                         data_list[0]->window_probe = 1;
8243                                                         net->window_probe = 1;
8244                                                 }
8245                                                 break;
8246                                         }
8247                                 } else {
8248                                         /*
8249                                          * Must be sent in order of the
8250                                          * TSN's (on a network)
8251                                          */
8252                                         break;
8253                                 }
8254                         }       /* for (chunk gather loop for this net) */
8255                 }               /* if asoc.state OPEN */
8256 no_data_fill:
8257                 /* Is there something to send for this destination? */
8258                 if (outchain) {
8259                         /* We may need to start a control timer or two */
8260                         if (asconf) {
8261                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8262                                     stcb, net);
8263                                 /*
8264                                  * do NOT clear the asconf flag as it is
8265                                  * used to do appropriate source address
8266                                  * selection.
8267                                  */
8268                         }
8269                         if (cookie) {
8270                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8271                                 cookie = 0;
8272                         }
8273                         /* must start a send timer if data is being sent */
8274                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8275                                 /*
8276                                  * no timer running on this destination
8277                                  * restart it.
8278                                  */
8279                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8280                         } else if ((asoc->sctp_cmt_on_off == 1) &&
8281                                     (asoc->sctp_cmt_pf > 0) &&
8282                                     pf_hbflag &&
8283                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8284                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8285                                 /*
8286                                  * JRS 5/14/07 - If a HB has been sent to a
8287                                  * PF destination and no T3 timer is
8288                                  * currently running, start the T3 timer to
8289                                  * track the HBs that were sent.
8290                                  */
8291                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8292                         }
8293                         /* Now send it, if there is anything to send :> */
8294                         if ((error = sctp_lowlevel_chunk_output(inp,
8295                             stcb,
8296                             net,
8297                             (struct sockaddr *)&net->ro._l_addr,
8298                             outchain,
8299                             auth_offset,
8300                             auth,
8301                             auth_keyid,
8302                             no_fragmentflg,
8303                             bundle_at,
8304                             data_list[0],
8305                             asconf,
8306                             inp->sctp_lport, stcb->rport,
8307                             htonl(stcb->asoc.peer_vtag),
8308                             net->port, so_locked, NULL))) {
8309                                 /* error, we could not output */
8310                                 if (error == ENOBUFS) {
8311                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8312                                         asoc->ifp_had_enobuf = 1;
8313                                 }
8314                                 if (from_where == 0) {
8315                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8316                                 }
8317                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8318                                 if (hbflag) {
8319                                         if (*now_filled == 0) {
8320                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8321                                                 *now_filled = 1;
8322                                                 *now = net->last_sent_time;
8323                                         } else {
8324                                                 net->last_sent_time = *now;
8325                                         }
8326                                         hbflag = 0;
8327                                 }
8328                                 if (error == EHOSTUNREACH) {
8329                                         /*
8330                                          * Destination went unreachable
8331                                          * during this send
8332                                          */
8333                                         sctp_move_to_an_alt(stcb, asoc, net);
8334                                 }
8335                                 *reason_code = 6;
8336                                 /*-
8337                                  * I add this line to be paranoid. As far as
8338                                  * I can tell the continue, takes us back to
8339                                  * the top of the for, but just to make sure
8340                                  * I will reset these again here.
8341                                  */
8342                                 ctl_cnt = bundle_at = 0;
8343                                 continue;       /* This takes us back to the
8344                                                  * for() for the nets. */
8345                         } else {
8346                                 asoc->ifp_had_enobuf = 0;
8347                         }
8348                         outchain = endoutchain = NULL;
8349                         auth = NULL;
8350                         auth_offset = 0;
8351                         if (bundle_at || hbflag) {
8352                                 /* For data/asconf and hb set time */
8353                                 if (*now_filled == 0) {
8354                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8355                                         *now_filled = 1;
8356                                         *now = net->last_sent_time;
8357                                 } else {
8358                                         net->last_sent_time = *now;
8359                                 }
8360                         }
8361                         if (!no_out_cnt) {
8362                                 *num_out += (ctl_cnt + bundle_at);
8363                         }
8364                         if (bundle_at) {
8365                                 /* setup for a RTO measurement */
8366                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8367                                 /* fill time if not already filled */
8368                                 if (*now_filled == 0) {
8369                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8370                                         *now_filled = 1;
8371                                         *now = asoc->time_last_sent;
8372                                 } else {
8373                                         asoc->time_last_sent = *now;
8374                                 }
8375                                 data_list[0]->do_rtt = 1;
8376                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8377                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8378                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8379                                         if (net->flight_size < net->cwnd) {
8380                                                 /* start or restart it */
8381                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8382                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8383                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8384                                                 }
8385                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8386                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8387                                         } else {
8388                                                 /* stop it if its running */
8389                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8390                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8391                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8392                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8393                                                 }
8394                                         }
8395                                 }
8396                         }
8397                         if (one_chunk) {
8398                                 break;
8399                         }
8400                 }
8401                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8402                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8403                 }
8404         }
8405         if (old_start_at == NULL) {
8406                 old_start_at = start_at;
8407                 start_at = TAILQ_FIRST(&asoc->nets);
8408                 if (old_start_at)
8409                         goto again_one_more_time;
8410         }
8411         /*
8412          * At the end there should be no NON timed chunks hanging on this
8413          * queue.
8414          */
8415         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8416                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8417         }
8418         if ((*num_out == 0) && (*reason_code == 0)) {
8419                 *reason_code = 4;
8420         } else {
8421                 *reason_code = 5;
8422         }
8423         sctp_clean_up_ctl(stcb, asoc);
8424         return (0);
8425 }
8426
8427 void
8428 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8429 {
8430         /*-
8431          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8432          * the control chunk queue.
8433          */
8434         struct sctp_chunkhdr *hdr;
8435         struct sctp_tmit_chunk *chk;
8436         struct mbuf *mat;
8437
8438         SCTP_TCB_LOCK_ASSERT(stcb);
8439         sctp_alloc_a_chunk(stcb, chk);
8440         if (chk == NULL) {
8441                 /* no memory */
8442                 sctp_m_freem(op_err);
8443                 return;
8444         }
8445         chk->copy_by_ref = 0;
8446         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8447         if (op_err == NULL) {
8448                 sctp_free_a_chunk(stcb, chk);
8449                 return;
8450         }
8451         chk->send_size = 0;
8452         mat = op_err;
8453         while (mat != NULL) {
8454                 chk->send_size += SCTP_BUF_LEN(mat);
8455                 mat = SCTP_BUF_NEXT(mat);
8456         }
8457         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8458         chk->rec.chunk_id.can_take_data = 1;
8459         chk->sent = SCTP_DATAGRAM_UNSENT;
8460         chk->snd_count = 0;
8461         chk->flags = 0;
8462         chk->asoc = &stcb->asoc;
8463         chk->data = op_err;
8464         chk->whoTo = chk->asoc->primary_destination;
8465         atomic_add_int(&chk->whoTo->ref_count, 1);
8466         hdr = mtod(op_err, struct sctp_chunkhdr *);
8467         hdr->chunk_type = SCTP_OPERATION_ERROR;
8468         hdr->chunk_flags = 0;
8469         hdr->chunk_length = htons(chk->send_size);
8470         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8471             chk,
8472             sctp_next);
8473         chk->asoc->ctrl_queue_cnt++;
8474 }
8475
8476 int
8477 sctp_send_cookie_echo(struct mbuf *m,
8478     int offset,
8479     struct sctp_tcb *stcb,
8480     struct sctp_nets *net)
8481 {
8482         /*-
8483          * pull out the cookie and put it at the front of the control chunk
8484          * queue.
8485          */
8486         int at;
8487         struct mbuf *cookie;
8488         struct sctp_paramhdr parm, *phdr;
8489         struct sctp_chunkhdr *hdr;
8490         struct sctp_tmit_chunk *chk;
8491         uint16_t ptype, plen;
8492
8493         /* First find the cookie in the param area */
8494         cookie = NULL;
8495         at = offset + sizeof(struct sctp_init_chunk);
8496
8497         SCTP_TCB_LOCK_ASSERT(stcb);
8498         do {
8499                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8500                 if (phdr == NULL) {
8501                         return (-3);
8502                 }
8503                 ptype = ntohs(phdr->param_type);
8504                 plen = ntohs(phdr->param_length);
8505                 if (ptype == SCTP_STATE_COOKIE) {
8506                         int pad;
8507
8508                         /* found the cookie */
8509                         if ((pad = (plen % 4))) {
8510                                 plen += 4 - pad;
8511                         }
8512                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8513                         if (cookie == NULL) {
8514                                 /* No memory */
8515                                 return (-2);
8516                         }
8517 #ifdef SCTP_MBUF_LOGGING
8518                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8519                                 struct mbuf *mat;
8520
8521                                 mat = cookie;
8522                                 while (mat) {
8523                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8524                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8525                                         }
8526                                         mat = SCTP_BUF_NEXT(mat);
8527                                 }
8528                         }
8529 #endif
8530                         break;
8531                 }
8532                 at += SCTP_SIZE32(plen);
8533         } while (phdr);
8534         if (cookie == NULL) {
8535                 /* Did not find the cookie */
8536                 return (-3);
8537         }
8538         /* ok, we got the cookie lets change it into a cookie echo chunk */
8539
8540         /* first the change from param to cookie */
8541         hdr = mtod(cookie, struct sctp_chunkhdr *);
8542         hdr->chunk_type = SCTP_COOKIE_ECHO;
8543         hdr->chunk_flags = 0;
8544         /* get the chunk stuff now and place it in the FRONT of the queue */
8545         sctp_alloc_a_chunk(stcb, chk);
8546         if (chk == NULL) {
8547                 /* no memory */
8548                 sctp_m_freem(cookie);
8549                 return (-5);
8550         }
8551         chk->copy_by_ref = 0;
8552         chk->send_size = plen;
8553         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8554         chk->rec.chunk_id.can_take_data = 0;
8555         chk->sent = SCTP_DATAGRAM_UNSENT;
8556         chk->snd_count = 0;
8557         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8558         chk->asoc = &stcb->asoc;
8559         chk->data = cookie;
8560         chk->whoTo = chk->asoc->primary_destination;
8561         atomic_add_int(&chk->whoTo->ref_count, 1);
8562         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8563         chk->asoc->ctrl_queue_cnt++;
8564         return (0);
8565 }
8566
8567 void
8568 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8569     struct mbuf *m,
8570     int offset,
8571     int chk_length,
8572     struct sctp_nets *net)
8573 {
8574         /*
8575          * take a HB request and make it into a HB ack and send it.
8576          */
8577         struct mbuf *outchain;
8578         struct sctp_chunkhdr *chdr;
8579         struct sctp_tmit_chunk *chk;
8580
8581
8582         if (net == NULL)
8583                 /* must have a net pointer */
8584                 return;
8585
8586         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8587         if (outchain == NULL) {
8588                 /* gak out of memory */
8589                 return;
8590         }
8591 #ifdef SCTP_MBUF_LOGGING
8592         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8593                 struct mbuf *mat;
8594
8595                 mat = outchain;
8596                 while (mat) {
8597                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8598                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8599                         }
8600                         mat = SCTP_BUF_NEXT(mat);
8601                 }
8602         }
8603 #endif
8604         chdr = mtod(outchain, struct sctp_chunkhdr *);
8605         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8606         chdr->chunk_flags = 0;
8607         if (chk_length % 4) {
8608                 /* need pad */
8609                 uint32_t cpthis = 0;
8610                 int padlen;
8611
8612                 padlen = 4 - (chk_length % 4);
8613                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8614         }
8615         sctp_alloc_a_chunk(stcb, chk);
8616         if (chk == NULL) {
8617                 /* no memory */
8618                 sctp_m_freem(outchain);
8619                 return;
8620         }
8621         chk->copy_by_ref = 0;
8622         chk->send_size = chk_length;
8623         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8624         chk->rec.chunk_id.can_take_data = 1;
8625         chk->sent = SCTP_DATAGRAM_UNSENT;
8626         chk->snd_count = 0;
8627         chk->flags = 0;
8628         chk->asoc = &stcb->asoc;
8629         chk->data = outchain;
8630         chk->whoTo = net;
8631         atomic_add_int(&chk->whoTo->ref_count, 1);
8632         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8633         chk->asoc->ctrl_queue_cnt++;
8634 }
8635
8636 void
8637 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8638 {
8639         /* formulate and queue a cookie-ack back to sender */
8640         struct mbuf *cookie_ack;
8641         struct sctp_chunkhdr *hdr;
8642         struct sctp_tmit_chunk *chk;
8643
8644         cookie_ack = NULL;
8645         SCTP_TCB_LOCK_ASSERT(stcb);
8646
8647         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8648         if (cookie_ack == NULL) {
8649                 /* no mbuf's */
8650                 return;
8651         }
8652         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8653         sctp_alloc_a_chunk(stcb, chk);
8654         if (chk == NULL) {
8655                 /* no memory */
8656                 sctp_m_freem(cookie_ack);
8657                 return;
8658         }
8659         chk->copy_by_ref = 0;
8660         chk->send_size = sizeof(struct sctp_chunkhdr);
8661         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8662         chk->rec.chunk_id.can_take_data = 1;
8663         chk->sent = SCTP_DATAGRAM_UNSENT;
8664         chk->snd_count = 0;
8665         chk->flags = 0;
8666         chk->asoc = &stcb->asoc;
8667         chk->data = cookie_ack;
8668         if (chk->asoc->last_control_chunk_from != NULL) {
8669                 chk->whoTo = chk->asoc->last_control_chunk_from;
8670         } else {
8671                 chk->whoTo = chk->asoc->primary_destination;
8672         }
8673         atomic_add_int(&chk->whoTo->ref_count, 1);
8674         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8675         hdr->chunk_type = SCTP_COOKIE_ACK;
8676         hdr->chunk_flags = 0;
8677         hdr->chunk_length = htons(chk->send_size);
8678         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8679         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8680         chk->asoc->ctrl_queue_cnt++;
8681         return;
8682 }
8683
8684
8685 void
8686 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8687 {
8688         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8689         struct mbuf *m_shutdown_ack;
8690         struct sctp_shutdown_ack_chunk *ack_cp;
8691         struct sctp_tmit_chunk *chk;
8692
8693         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8694         if (m_shutdown_ack == NULL) {
8695                 /* no mbuf's */
8696                 return;
8697         }
8698         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8699         sctp_alloc_a_chunk(stcb, chk);
8700         if (chk == NULL) {
8701                 /* no memory */
8702                 sctp_m_freem(m_shutdown_ack);
8703                 return;
8704         }
8705         chk->copy_by_ref = 0;
8706         chk->send_size = sizeof(struct sctp_chunkhdr);
8707         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8708         chk->rec.chunk_id.can_take_data = 1;
8709         chk->sent = SCTP_DATAGRAM_UNSENT;
8710         chk->snd_count = 0;
8711         chk->flags = 0;
8712         chk->asoc = &stcb->asoc;
8713         chk->data = m_shutdown_ack;
8714         chk->whoTo = net;
8715         atomic_add_int(&net->ref_count, 1);
8716
8717         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8718         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8719         ack_cp->ch.chunk_flags = 0;
8720         ack_cp->ch.chunk_length = htons(chk->send_size);
8721         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8722         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8723         chk->asoc->ctrl_queue_cnt++;
8724         return;
8725 }
8726
8727 void
8728 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8729 {
8730         /* formulate and queue a SHUTDOWN to the sender */
8731         struct mbuf *m_shutdown;
8732         struct sctp_shutdown_chunk *shutdown_cp;
8733         struct sctp_tmit_chunk *chk;
8734
8735         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8736         if (m_shutdown == NULL) {
8737                 /* no mbuf's */
8738                 return;
8739         }
8740         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8741         sctp_alloc_a_chunk(stcb, chk);
8742         if (chk == NULL) {
8743                 /* no memory */
8744                 sctp_m_freem(m_shutdown);
8745                 return;
8746         }
8747         chk->copy_by_ref = 0;
8748         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8749         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8750         chk->rec.chunk_id.can_take_data = 1;
8751         chk->sent = SCTP_DATAGRAM_UNSENT;
8752         chk->snd_count = 0;
8753         chk->flags = 0;
8754         chk->asoc = &stcb->asoc;
8755         chk->data = m_shutdown;
8756         chk->whoTo = net;
8757         atomic_add_int(&net->ref_count, 1);
8758
8759         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8760         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8761         shutdown_cp->ch.chunk_flags = 0;
8762         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8763         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8764         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8765         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8766         chk->asoc->ctrl_queue_cnt++;
8767         return;
8768 }
8769
8770 void
8771 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8772 {
8773         /*
8774          * formulate and queue an ASCONF to the peer. ASCONF parameters
8775          * should be queued on the assoc queue.
8776          */
8777         struct sctp_tmit_chunk *chk;
8778         struct mbuf *m_asconf;
8779         int len;
8780
8781         SCTP_TCB_LOCK_ASSERT(stcb);
8782
8783         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8784             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8785                 /* can't send a new one if there is one in flight already */
8786                 return;
8787         }
8788         /* compose an ASCONF chunk, maximum length is PMTU */
8789         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8790         if (m_asconf == NULL) {
8791                 return;
8792         }
8793         sctp_alloc_a_chunk(stcb, chk);
8794         if (chk == NULL) {
8795                 /* no memory */
8796                 sctp_m_freem(m_asconf);
8797                 return;
8798         }
8799         chk->copy_by_ref = 0;
8800         chk->data = m_asconf;
8801         chk->send_size = len;
8802         chk->rec.chunk_id.id = SCTP_ASCONF;
8803         chk->rec.chunk_id.can_take_data = 0;
8804         chk->sent = SCTP_DATAGRAM_UNSENT;
8805         chk->snd_count = 0;
8806         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8807         chk->asoc = &stcb->asoc;
8808         chk->whoTo = net;
8809         atomic_add_int(&chk->whoTo->ref_count, 1);
8810         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8811         chk->asoc->ctrl_queue_cnt++;
8812         return;
8813 }
8814
8815 void
8816 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8817 {
8818         /*
8819          * formulate and queue a asconf-ack back to sender. the asconf-ack
8820          * must be stored in the tcb.
8821          */
8822         struct sctp_tmit_chunk *chk;
8823         struct sctp_asconf_ack *ack, *latest_ack;
8824         struct mbuf *m_ack, *m;
8825         struct sctp_nets *net = NULL;
8826
8827         SCTP_TCB_LOCK_ASSERT(stcb);
8828         /* Get the latest ASCONF-ACK */
8829         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8830         if (latest_ack == NULL) {
8831                 return;
8832         }
8833         if (latest_ack->last_sent_to != NULL &&
8834             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8835                 /* we're doing a retransmission */
8836                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8837                 if (net == NULL) {
8838                         /* no alternate */
8839                         if (stcb->asoc.last_control_chunk_from == NULL)
8840                                 net = stcb->asoc.primary_destination;
8841                         else
8842                                 net = stcb->asoc.last_control_chunk_from;
8843                 }
8844         } else {
8845                 /* normal case */
8846                 if (stcb->asoc.last_control_chunk_from == NULL)
8847                         net = stcb->asoc.primary_destination;
8848                 else
8849                         net = stcb->asoc.last_control_chunk_from;
8850         }
8851         latest_ack->last_sent_to = net;
8852
8853         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8854                 if (ack->data == NULL) {
8855                         continue;
8856                 }
8857                 /* copy the asconf_ack */
8858                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8859                 if (m_ack == NULL) {
8860                         /* couldn't copy it */
8861                         return;
8862                 }
8863 #ifdef SCTP_MBUF_LOGGING
8864                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8865                         struct mbuf *mat;
8866
8867                         mat = m_ack;
8868                         while (mat) {
8869                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8870                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8871                                 }
8872                                 mat = SCTP_BUF_NEXT(mat);
8873                         }
8874                 }
8875 #endif
8876
8877                 sctp_alloc_a_chunk(stcb, chk);
8878                 if (chk == NULL) {
8879                         /* no memory */
8880                         if (m_ack)
8881                                 sctp_m_freem(m_ack);
8882                         return;
8883                 }
8884                 chk->copy_by_ref = 0;
8885
8886                 chk->whoTo = net;
8887                 chk->data = m_ack;
8888                 chk->send_size = 0;
8889                 /* Get size */
8890                 m = m_ack;
8891                 chk->send_size = ack->len;
8892                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8893                 chk->rec.chunk_id.can_take_data = 1;
8894                 chk->sent = SCTP_DATAGRAM_UNSENT;
8895                 chk->snd_count = 0;
8896                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8897                 chk->asoc = &stcb->asoc;
8898                 atomic_add_int(&chk->whoTo->ref_count, 1);
8899
8900                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8901                 chk->asoc->ctrl_queue_cnt++;
8902         }
8903         return;
8904 }
8905
8906
8907 static int
8908 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8909     struct sctp_tcb *stcb,
8910     struct sctp_association *asoc,
8911     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8912 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8913     SCTP_UNUSED
8914 #endif
8915 )
8916 {
8917         /*-
8918          * send out one MTU of retransmission. If fast_retransmit is
8919          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8920          * rwnd. For a Cookie or Asconf in the control chunk queue we
8921          * retransmit them by themselves.
8922          *
8923          * For data chunks we will pick out the lowest TSN's in the sent_queue
8924          * marked for resend and bundle them all together (up to a MTU of
8925          * destination). The address to send to should have been
8926          * selected/changed where the retransmission was marked (i.e. in FR
8927          * or t3-timeout routines).
8928          */
8929         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8930         struct sctp_tmit_chunk *chk, *fwd;
8931         struct mbuf *m, *endofchain;
8932         struct sctp_nets *net = NULL;
8933         uint32_t tsns_sent = 0;
8934         int no_fragmentflg, bundle_at, cnt_thru;
8935         unsigned int mtu;
8936         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8937         struct sctp_auth_chunk *auth = NULL;
8938         uint32_t auth_offset = 0;
8939         uint16_t auth_keyid;
8940         int override_ok = 1;
8941         int data_auth_reqd = 0;
8942         uint32_t dmtu = 0;
8943
8944         SCTP_TCB_LOCK_ASSERT(stcb);
8945         tmr_started = ctl_cnt = bundle_at = error = 0;
8946         no_fragmentflg = 1;
8947         fwd_tsn = 0;
8948         *cnt_out = 0;
8949         fwd = NULL;
8950         endofchain = m = NULL;
8951         auth_keyid = stcb->asoc.authinfo.active_keyid;
8952 #ifdef SCTP_AUDITING_ENABLED
8953         sctp_audit_log(0xC3, 1);
8954 #endif
8955         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8956             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8957                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8958                     asoc->sent_queue_retran_cnt);
8959                 asoc->sent_queue_cnt = 0;
8960                 asoc->sent_queue_cnt_removeable = 0;
8961                 /* send back 0/0 so we enter normal transmission */
8962                 *cnt_out = 0;
8963                 return (0);
8964         }
8965         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8966                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8967                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8968                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8969                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8970                                 continue;
8971                         }
8972                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8973                                 if (chk != asoc->str_reset) {
8974                                         /*
8975                                          * not eligible for retran if its
8976                                          * not ours
8977                                          */
8978                                         continue;
8979                                 }
8980                         }
8981                         ctl_cnt++;
8982                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8983                                 fwd_tsn = 1;
8984                                 fwd = chk;
8985                         }
8986                         /*
8987                          * Add an AUTH chunk, if chunk requires it save the
8988                          * offset into the chain for AUTH
8989                          */
8990                         if ((auth == NULL) &&
8991                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8992                             stcb->asoc.peer_auth_chunks))) {
8993                                 m = sctp_add_auth_chunk(m, &endofchain,
8994                                     &auth, &auth_offset,
8995                                     stcb,
8996                                     chk->rec.chunk_id.id);
8997                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8998                         }
8999                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9000                         break;
9001                 }
9002         }
9003         one_chunk = 0;
9004         cnt_thru = 0;
9005         /* do we have control chunks to retransmit? */
9006         if (m != NULL) {
9007                 /* Start a timer no matter if we suceed or fail */
9008                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9009                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9010                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9011                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9012                 chk->snd_count++;       /* update our count */
9013                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9014                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9015                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9016                     no_fragmentflg, 0, NULL, 0,
9017                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9018                     chk->whoTo->port, so_locked, NULL))) {
9019                         SCTP_STAT_INCR(sctps_lowlevelerr);
9020                         return (error);
9021                 }
9022                 m = endofchain = NULL;
9023                 auth = NULL;
9024                 auth_offset = 0;
9025                 /*
9026                  * We don't want to mark the net->sent time here since this
9027                  * we use this for HB and retrans cannot measure RTT
9028                  */
9029                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9030                 *cnt_out += 1;
9031                 chk->sent = SCTP_DATAGRAM_SENT;
9032                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9033                 if (fwd_tsn == 0) {
9034                         return (0);
9035                 } else {
9036                         /* Clean up the fwd-tsn list */
9037                         sctp_clean_up_ctl(stcb, asoc);
9038                         return (0);
9039                 }
9040         }
9041         /*
9042          * Ok, it is just data retransmission we need to do or that and a
9043          * fwd-tsn with it all.
9044          */
9045         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9046                 return (SCTP_RETRAN_DONE);
9047         }
9048         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9049             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9050                 /* not yet open, resend the cookie and that is it */
9051                 return (1);
9052         }
9053 #ifdef SCTP_AUDITING_ENABLED
9054         sctp_auditing(20, inp, stcb, NULL);
9055 #endif
9056         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9057         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9058                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9059                         /* No, not sent to this net or not ready for rtx */
9060                         continue;
9061                 }
9062                 if (chk->data == NULL) {
9063                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9064                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9065                         continue;
9066                 }
9067                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9068                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9069                         /* Gak, we have exceeded max unlucky retran, abort! */
9070                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9071                             chk->snd_count,
9072                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9073                         atomic_add_int(&stcb->asoc.refcnt, 1);
9074                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9075                         SCTP_TCB_LOCK(stcb);
9076                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9077                         return (SCTP_RETRAN_EXIT);
9078                 }
9079                 /* pick up the net */
9080                 net = chk->whoTo;
9081                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9082                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9083                 } else {
9084                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9085                 }
9086
9087                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9088                         /* No room in peers rwnd */
9089                         uint32_t tsn;
9090
9091                         tsn = asoc->last_acked_seq + 1;
9092                         if (tsn == chk->rec.data.TSN_seq) {
9093                                 /*
9094                                  * we make a special exception for this
9095                                  * case. The peer has no rwnd but is missing
9096                                  * the lowest chunk.. which is probably what
9097                                  * is holding up the rwnd.
9098                                  */
9099                                 goto one_chunk_around;
9100                         }
9101                         return (1);
9102                 }
9103 one_chunk_around:
9104                 if (asoc->peers_rwnd < mtu) {
9105                         one_chunk = 1;
9106                         if ((asoc->peers_rwnd == 0) &&
9107                             (asoc->total_flight == 0)) {
9108                                 chk->window_probe = 1;
9109                                 chk->whoTo->window_probe = 1;
9110                         }
9111                 }
9112 #ifdef SCTP_AUDITING_ENABLED
9113                 sctp_audit_log(0xC3, 2);
9114 #endif
9115                 bundle_at = 0;
9116                 m = NULL;
9117                 net->fast_retran_ip = 0;
9118                 if (chk->rec.data.doing_fast_retransmit == 0) {
9119                         /*
9120                          * if no FR in progress skip destination that have
9121                          * flight_size > cwnd.
9122                          */
9123                         if (net->flight_size >= net->cwnd) {
9124                                 continue;
9125                         }
9126                 } else {
9127                         /*
9128                          * Mark the destination net to have FR recovery
9129                          * limits put on it.
9130                          */
9131                         *fr_done = 1;
9132                         net->fast_retran_ip = 1;
9133                 }
9134
9135                 /*
9136                  * if no AUTH is yet included and this chunk requires it,
9137                  * make sure to account for it.  We don't apply the size
9138                  * until the AUTH chunk is actually added below in case
9139                  * there is no room for this chunk.
9140                  */
9141                 if (data_auth_reqd && (auth == NULL)) {
9142                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9143                 } else
9144                         dmtu = 0;
9145
9146                 if ((chk->send_size <= (mtu - dmtu)) ||
9147                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9148                         /* ok we will add this one */
9149                         if (data_auth_reqd) {
9150                                 if (auth == NULL) {
9151                                         m = sctp_add_auth_chunk(m,
9152                                             &endofchain,
9153                                             &auth,
9154                                             &auth_offset,
9155                                             stcb,
9156                                             SCTP_DATA);
9157                                         auth_keyid = chk->auth_keyid;
9158                                         override_ok = 0;
9159                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9160                                 } else if (override_ok) {
9161                                         auth_keyid = chk->auth_keyid;
9162                                         override_ok = 0;
9163                                 } else if (chk->auth_keyid != auth_keyid) {
9164                                         /* different keyid, so done bundling */
9165                                         break;
9166                                 }
9167                         }
9168                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9169                         if (m == NULL) {
9170                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9171                                 return (ENOMEM);
9172                         }
9173                         /* Do clear IP_DF ? */
9174                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9175                                 no_fragmentflg = 0;
9176                         }
9177                         /* upate our MTU size */
9178                         if (mtu > (chk->send_size + dmtu))
9179                                 mtu -= (chk->send_size + dmtu);
9180                         else
9181                                 mtu = 0;
9182                         data_list[bundle_at++] = chk;
9183                         if (one_chunk && (asoc->total_flight <= 0)) {
9184                                 SCTP_STAT_INCR(sctps_windowprobed);
9185                         }
9186                 }
9187                 if (one_chunk == 0) {
9188                         /*
9189                          * now are there anymore forward from chk to pick
9190                          * up?
9191                          */
9192                         fwd = TAILQ_NEXT(chk, sctp_next);
9193                         while (fwd) {
9194                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9195                                         /* Nope, not for retran */
9196                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9197                                         continue;
9198                                 }
9199                                 if (fwd->whoTo != net) {
9200                                         /* Nope, not the net in question */
9201                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9202                                         continue;
9203                                 }
9204                                 if (data_auth_reqd && (auth == NULL)) {
9205                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9206                                 } else
9207                                         dmtu = 0;
9208                                 if (fwd->send_size <= (mtu - dmtu)) {
9209                                         if (data_auth_reqd) {
9210                                                 if (auth == NULL) {
9211                                                         m = sctp_add_auth_chunk(m,
9212                                                             &endofchain,
9213                                                             &auth,
9214                                                             &auth_offset,
9215                                                             stcb,
9216                                                             SCTP_DATA);
9217                                                         auth_keyid = fwd->auth_keyid;
9218                                                         override_ok = 0;
9219                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9220                                                 } else if (override_ok) {
9221                                                         auth_keyid = fwd->auth_keyid;
9222                                                         override_ok = 0;
9223                                                 } else if (fwd->auth_keyid != auth_keyid) {
9224                                                         /*
9225                                                          * different keyid,
9226                                                          * so done bundling
9227                                                          */
9228                                                         break;
9229                                                 }
9230                                         }
9231                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9232                                         if (m == NULL) {
9233                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9234                                                 return (ENOMEM);
9235                                         }
9236                                         /* Do clear IP_DF ? */
9237                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9238                                                 no_fragmentflg = 0;
9239                                         }
9240                                         /* upate our MTU size */
9241                                         if (mtu > (fwd->send_size + dmtu))
9242                                                 mtu -= (fwd->send_size + dmtu);
9243                                         else
9244                                                 mtu = 0;
9245                                         data_list[bundle_at++] = fwd;
9246                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9247                                                 break;
9248                                         }
9249                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9250                                 } else {
9251                                         /* can't fit so we are done */
9252                                         break;
9253                                 }
9254                         }
9255                 }
9256                 /* Is there something to send for this destination? */
9257                 if (m) {
9258                         /*
9259                          * No matter if we fail/or suceed we should start a
9260                          * timer. A failure is like a lost IP packet :-)
9261                          */
9262                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9263                                 /*
9264                                  * no timer running on this destination
9265                                  * restart it.
9266                                  */
9267                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9268                                 tmr_started = 1;
9269                         }
9270                         /* Now lets send it, if there is anything to send :> */
9271                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9272                             (struct sockaddr *)&net->ro._l_addr, m,
9273                             auth_offset, auth, auth_keyid,
9274                             no_fragmentflg, 0, NULL, 0,
9275                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9276                             net->port, so_locked, NULL))) {
9277                                 /* error, we could not output */
9278                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9279                                 return (error);
9280                         }
9281                         m = endofchain = NULL;
9282                         auth = NULL;
9283                         auth_offset = 0;
9284                         /* For HB's */
9285                         /*
9286                          * We don't want to mark the net->sent time here
9287                          * since this we use this for HB and retrans cannot
9288                          * measure RTT
9289                          */
9290                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9291
9292                         /* For auto-close */
9293                         cnt_thru++;
9294                         if (*now_filled == 0) {
9295                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9296                                 *now = asoc->time_last_sent;
9297                                 *now_filled = 1;
9298                         } else {
9299                                 asoc->time_last_sent = *now;
9300                         }
9301                         *cnt_out += bundle_at;
9302 #ifdef SCTP_AUDITING_ENABLED
9303                         sctp_audit_log(0xC4, bundle_at);
9304 #endif
9305                         if (bundle_at) {
9306                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9307                         }
9308                         for (i = 0; i < bundle_at; i++) {
9309                                 SCTP_STAT_INCR(sctps_sendretransdata);
9310                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9311                                 /*
9312                                  * When we have a revoked data, and we
9313                                  * retransmit it, then we clear the revoked
9314                                  * flag since this flag dictates if we
9315                                  * subtracted from the fs
9316                                  */
9317                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9318                                         /* Deflate the cwnd */
9319                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9320                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9321                                 }
9322                                 data_list[i]->snd_count++;
9323                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9324                                 /* record the time */
9325                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9326                                 if (data_list[i]->book_size_scale) {
9327                                         /*
9328                                          * need to double the book size on
9329                                          * this one
9330                                          */
9331                                         data_list[i]->book_size_scale = 0;
9332                                         /*
9333                                          * Since we double the booksize, we
9334                                          * must also double the output queue
9335                                          * size, since this get shrunk when
9336                                          * we free by this amount.
9337                                          */
9338                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9339                                         data_list[i]->book_size *= 2;
9340
9341
9342                                 } else {
9343                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9344                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9345                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9346                                         }
9347                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9348                                             (uint32_t) (data_list[i]->send_size +
9349                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9350                                 }
9351                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9352                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9353                                             data_list[i]->whoTo->flight_size,
9354                                             data_list[i]->book_size,
9355                                             (uintptr_t) data_list[i]->whoTo,
9356                                             data_list[i]->rec.data.TSN_seq);
9357                                 }
9358                                 sctp_flight_size_increase(data_list[i]);
9359                                 sctp_total_flight_increase(stcb, data_list[i]);
9360                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9361                                         /* SWS sender side engages */
9362                                         asoc->peers_rwnd = 0;
9363                                 }
9364                                 if ((i == 0) &&
9365                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9366                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9367                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9368                                             (tmr_started == 0)) {
9369                                                 /*-
9370                                                  * ok we just fast-retrans'd
9371                                                  * the lowest TSN, i.e the
9372                                                  * first on the list. In
9373                                                  * this case we want to give
9374                                                  * some more time to get a
9375                                                  * SACK back without a
9376                                                  * t3-expiring.
9377                                                  */
9378                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9379                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9380                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9381                                         }
9382                                 }
9383                         }
9384                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9385                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9386                         }
9387 #ifdef SCTP_AUDITING_ENABLED
9388                         sctp_auditing(21, inp, stcb, NULL);
9389 #endif
9390                 } else {
9391                         /* None will fit */
9392                         return (1);
9393                 }
9394                 if (asoc->sent_queue_retran_cnt <= 0) {
9395                         /* all done we have no more to retran */
9396                         asoc->sent_queue_retran_cnt = 0;
9397                         break;
9398                 }
9399                 if (one_chunk) {
9400                         /* No more room in rwnd */
9401                         return (1);
9402                 }
9403                 /* stop the for loop here. we sent out a packet */
9404                 break;
9405         }
9406         return (0);
9407 }
9408
9409
9410 static int
9411 sctp_timer_validation(struct sctp_inpcb *inp,
9412     struct sctp_tcb *stcb,
9413     struct sctp_association *asoc,
9414     int ret)
9415 {
9416         struct sctp_nets *net;
9417
9418         /* Validate that a timer is running somewhere */
9419         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9420                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9421                         /* Here is a timer */
9422                         return (ret);
9423                 }
9424         }
9425         SCTP_TCB_LOCK_ASSERT(stcb);
9426         /* Gak, we did not have a timer somewhere */
9427         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9428         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9429         return (ret);
9430 }
9431
9432 void
9433 sctp_chunk_output(struct sctp_inpcb *inp,
9434     struct sctp_tcb *stcb,
9435     int from_where,
9436     int so_locked
9437 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9438     SCTP_UNUSED
9439 #endif
9440 )
9441 {
9442         /*-
9443          * Ok this is the generic chunk service queue. we must do the
9444          * following:
9445          * - See if there are retransmits pending, if so we must
9446          *   do these first.
9447          * - Service the stream queue that is next, moving any
9448          *   message (note I must get a complete message i.e.
9449          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9450          *   TSN's
9451          * - Check to see if the cwnd/rwnd allows any output, if so we
9452          *   go ahead and fomulate and send the low level chunks. Making sure
9453          *   to combine any control in the control chunk queue also.
9454          */
9455         struct sctp_association *asoc;
9456         struct sctp_nets *net;
9457         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9458             burst_cnt = 0, burst_limit = 0;
9459         struct timeval now;
9460         int now_filled = 0;
9461         int nagle_on = 0;
9462         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9463         int un_sent = 0;
9464         int fr_done, tot_frs = 0;
9465
9466         asoc = &stcb->asoc;
9467         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9468                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9469                         nagle_on = 0;
9470                 } else {
9471                         nagle_on = 1;
9472                 }
9473         }
9474         SCTP_TCB_LOCK_ASSERT(stcb);
9475
9476         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9477
9478         if ((un_sent <= 0) &&
9479             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9480             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9481             (asoc->sent_queue_retran_cnt == 0)) {
9482                 /* Nothing to do unless there is something to be sent left */
9483                 return;
9484         }
9485         /*
9486          * Do we have something to send, data or control AND a sack timer
9487          * running, if so piggy-back the sack.
9488          */
9489         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9490                 sctp_send_sack(stcb);
9491                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9492         }
9493         while (asoc->sent_queue_retran_cnt) {
9494                 /*-
9495                  * Ok, it is retransmission time only, we send out only ONE
9496                  * packet with a single call off to the retran code.
9497                  */
9498                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9499                         /*-
9500                          * Special hook for handling cookiess discarded
9501                          * by peer that carried data. Send cookie-ack only
9502                          * and then the next call with get the retran's.
9503                          */
9504                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9505                             from_where,
9506                             &now, &now_filled, frag_point, so_locked);
9507                         return;
9508                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9509                         /* if its not from a HB then do it */
9510                         fr_done = 0;
9511                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9512                         if (fr_done) {
9513                                 tot_frs++;
9514                         }
9515                 } else {
9516                         /*
9517                          * its from any other place, we don't allow retran
9518                          * output (only control)
9519                          */
9520                         ret = 1;
9521                 }
9522                 if (ret > 0) {
9523                         /* Can't send anymore */
9524                         /*-
9525                          * now lets push out control by calling med-level
9526                          * output once. this assures that we WILL send HB's
9527                          * if queued too.
9528                          */
9529                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9530                             from_where,
9531                             &now, &now_filled, frag_point, so_locked);
9532 #ifdef SCTP_AUDITING_ENABLED
9533                         sctp_auditing(8, inp, stcb, NULL);
9534 #endif
9535                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9536                         return;
9537                 }
9538                 if (ret < 0) {
9539                         /*-
9540                          * The count was off.. retran is not happening so do
9541                          * the normal retransmission.
9542                          */
9543 #ifdef SCTP_AUDITING_ENABLED
9544                         sctp_auditing(9, inp, stcb, NULL);
9545 #endif
9546                         if (ret == SCTP_RETRAN_EXIT) {
9547                                 return;
9548                         }
9549                         break;
9550                 }
9551                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9552                         /* Only one transmission allowed out of a timeout */
9553 #ifdef SCTP_AUDITING_ENABLED
9554                         sctp_auditing(10, inp, stcb, NULL);
9555 #endif
9556                         /* Push out any control */
9557                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9558                             &now, &now_filled, frag_point, so_locked);
9559                         return;
9560                 }
9561                 if (tot_frs > asoc->max_burst) {
9562                         /* Hit FR burst limit */
9563                         return;
9564                 }
9565                 if ((num_out == 0) && (ret == 0)) {
9566
9567                         /* No more retrans to send */
9568                         break;
9569                 }
9570         }
9571 #ifdef SCTP_AUDITING_ENABLED
9572         sctp_auditing(12, inp, stcb, NULL);
9573 #endif
9574         /* Check for bad destinations, if they exist move chunks around. */
9575         burst_limit = asoc->max_burst;
9576         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9577                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9578                     SCTP_ADDR_NOT_REACHABLE) {
9579                         /*-
9580                          * if possible move things off of this address we
9581                          * still may send below due to the dormant state but
9582                          * we try to find an alternate address to send to
9583                          * and if we have one we move all queued data on the
9584                          * out wheel to this alternate address.
9585                          */
9586                         if (net->ref_count > 1)
9587                                 sctp_move_to_an_alt(stcb, asoc, net);
9588                 } else if ((asoc->sctp_cmt_on_off == 1) &&
9589                             (asoc->sctp_cmt_pf > 0) &&
9590                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9591                         /*
9592                          * JRS 5/14/07 - If CMT PF is on and the current
9593                          * destination is in PF state, move all queued data
9594                          * to an alternate desination.
9595                          */
9596                         if (net->ref_count > 1)
9597                                 sctp_move_to_an_alt(stcb, asoc, net);
9598                 } else {
9599                         /*-
9600                          * if ((asoc->sat_network) || (net->addr_is_local))
9601                          * { burst_limit = asoc->max_burst *
9602                          * SCTP_SAT_NETWORK_BURST_INCR; }
9603                          */
9604                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9605                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9606                                         /*
9607                                          * JRS - Use the congestion control
9608                                          * given in the congestion control
9609                                          * module
9610                                          */
9611                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9612                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9613                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9614                                         }
9615                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9616                                 }
9617                                 net->fast_retran_ip = 0;
9618                         } else {
9619                                 if (net->flight_size == 0) {
9620                                         /* Should be decaying the cwnd here */
9621                                         ;
9622                                 }
9623                         }
9624                 }
9625
9626         }
9627         burst_cnt = 0;
9628         do {
9629                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9630                     &reason_code, 0, from_where,
9631                     &now, &now_filled, frag_point, so_locked);
9632                 if (error) {
9633                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9634                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9635                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9636                         }
9637                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9638                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9639                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9640                         }
9641                         break;
9642                 }
9643                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9644
9645                 tot_out += num_out;
9646                 burst_cnt++;
9647                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9648                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9649                         if (num_out == 0) {
9650                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9651                         }
9652                 }
9653                 if (nagle_on) {
9654                         /*-
9655                          * When nagle is on, we look at how much is un_sent, then
9656                          * if its smaller than an MTU and we have data in
9657                          * flight we stop.
9658                          */
9659                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9660                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9661                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9662                             (stcb->asoc.total_flight > 0)) {
9663                                 break;
9664                         }
9665                 }
9666                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9667                     TAILQ_EMPTY(&asoc->send_queue) &&
9668                     TAILQ_EMPTY(&asoc->out_wheel)) {
9669                         /* Nothing left to send */
9670                         break;
9671                 }
9672                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9673                         /* Nothing left to send */
9674                         break;
9675                 }
9676         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9677             (burst_cnt < burst_limit)));
9678
9679         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9680                 if (burst_cnt >= burst_limit) {
9681                         SCTP_STAT_INCR(sctps_maxburstqueued);
9682                         asoc->burst_limit_applied = 1;
9683                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9684                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9685                         }
9686                 } else {
9687                         asoc->burst_limit_applied = 0;
9688                 }
9689         }
9690         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9691                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9692         }
9693         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9694             tot_out);
9695
9696         /*-
9697          * Now we need to clean up the control chunk chain if a ECNE is on
9698          * it. It must be marked as UNSENT again so next call will continue
9699          * to send it until such time that we get a CWR, to remove it.
9700          */
9701         if (stcb->asoc.ecn_echo_cnt_onq)
9702                 sctp_fix_ecn_echo(asoc);
9703         return;
9704 }
9705
9706
9707 int
9708 sctp_output(inp, m, addr, control, p, flags)
9709         struct sctp_inpcb *inp;
9710         struct mbuf *m;
9711         struct sockaddr *addr;
9712         struct mbuf *control;
9713         struct thread *p;
9714         int flags;
9715 {
9716         if (inp == NULL) {
9717                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9718                 return (EINVAL);
9719         }
9720         if (inp->sctp_socket == NULL) {
9721                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9722                 return (EINVAL);
9723         }
9724         return (sctp_sosend(inp->sctp_socket,
9725             addr,
9726             (struct uio *)NULL,
9727             m,
9728             control,
9729             flags, p
9730             ));
9731 }
9732
9733 void
9734 send_forward_tsn(struct sctp_tcb *stcb,
9735     struct sctp_association *asoc)
9736 {
9737         struct sctp_tmit_chunk *chk;
9738         struct sctp_forward_tsn_chunk *fwdtsn;
9739         uint32_t advance_peer_ack_point;
9740
9741         SCTP_TCB_LOCK_ASSERT(stcb);
9742         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9743                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9744                         /* mark it to unsent */
9745                         chk->sent = SCTP_DATAGRAM_UNSENT;
9746                         chk->snd_count = 0;
9747                         /* Do we correct its output location? */
9748                         if (chk->whoTo != asoc->primary_destination) {
9749                                 sctp_free_remote_addr(chk->whoTo);
9750                                 chk->whoTo = asoc->primary_destination;
9751                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9752                         }
9753                         goto sctp_fill_in_rest;
9754                 }
9755         }
9756         /* Ok if we reach here we must build one */
9757         sctp_alloc_a_chunk(stcb, chk);
9758         if (chk == NULL) {
9759                 return;
9760         }
9761         asoc->fwd_tsn_cnt++;
9762         chk->copy_by_ref = 0;
9763         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9764         chk->rec.chunk_id.can_take_data = 0;
9765         chk->asoc = asoc;
9766         chk->whoTo = NULL;
9767         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9768         if (chk->data == NULL) {
9769                 sctp_free_a_chunk(stcb, chk);
9770                 return;
9771         }
9772         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9773         chk->sent = SCTP_DATAGRAM_UNSENT;
9774         chk->snd_count = 0;
9775         chk->whoTo = asoc->primary_destination;
9776         atomic_add_int(&chk->whoTo->ref_count, 1);
9777         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9778         asoc->ctrl_queue_cnt++;
9779 sctp_fill_in_rest:
9780         /*-
9781          * Here we go through and fill out the part that deals with
9782          * stream/seq of the ones we skip.
9783          */
9784         SCTP_BUF_LEN(chk->data) = 0;
9785         {
9786                 struct sctp_tmit_chunk *at, *tp1, *last;
9787                 struct sctp_strseq *strseq;
9788                 unsigned int cnt_of_space, i, ovh;
9789                 unsigned int space_needed;
9790                 unsigned int cnt_of_skipped = 0;
9791
9792                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9793                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9794                                 /* no more to look at */
9795                                 break;
9796                         }
9797                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9798                                 /* We don't report these */
9799                                 continue;
9800                         }
9801                         cnt_of_skipped++;
9802                 }
9803                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9804                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9805
9806                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9807
9808                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9809                         ovh = SCTP_MIN_OVERHEAD;
9810                 } else {
9811                         ovh = SCTP_MIN_V4_OVERHEAD;
9812                 }
9813                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9814                         /* trim to a mtu size */
9815                         cnt_of_space = asoc->smallest_mtu - ovh;
9816                 }
9817                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9818                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9819                             0xff, 0, cnt_of_skipped,
9820                             asoc->advanced_peer_ack_point);
9821
9822                 }
9823                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9824                 if (cnt_of_space < space_needed) {
9825                         /*-
9826                          * ok we must trim down the chunk by lowering the
9827                          * advance peer ack point.
9828                          */
9829                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9830                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9831                                     0xff, 0xff, cnt_of_space,
9832                                     space_needed);
9833                         }
9834                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9835                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9836                         /*-
9837                          * Go through and find the TSN that will be the one
9838                          * we report.
9839                          */
9840                         at = TAILQ_FIRST(&asoc->sent_queue);
9841                         for (i = 0; i < cnt_of_skipped; i++) {
9842                                 tp1 = TAILQ_NEXT(at, sctp_next);
9843                                 if (tp1 == NULL) {
9844                                         break;
9845                                 }
9846                                 at = tp1;
9847                         }
9848                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9849                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9850                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9851                                     asoc->advanced_peer_ack_point);
9852                         }
9853                         last = at;
9854                         /*-
9855                          * last now points to last one I can report, update
9856                          * peer ack point
9857                          */
9858                         if (last)
9859                                 advance_peer_ack_point = last->rec.data.TSN_seq;
9860                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
9861                             cnt_of_skipped * sizeof(struct sctp_strseq);
9862                 }
9863                 chk->send_size = space_needed;
9864                 /* Setup the chunk */
9865                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9866                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9867                 fwdtsn->ch.chunk_flags = 0;
9868                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9869                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9870                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9871                 fwdtsn++;
9872                 /*-
9873                  * Move pointer to after the fwdtsn and transfer to the
9874                  * strseq pointer.
9875                  */
9876                 strseq = (struct sctp_strseq *)fwdtsn;
9877                 /*-
9878                  * Now populate the strseq list. This is done blindly
9879                  * without pulling out duplicate stream info. This is
9880                  * inefficent but won't harm the process since the peer will
9881                  * look at these in sequence and will thus release anything.
9882                  * It could mean we exceed the PMTU and chop off some that
9883                  * we could have included.. but this is unlikely (aka 1432/4
9884                  * would mean 300+ stream seq's would have to be reported in
9885                  * one FWD-TSN. With a bit of work we can later FIX this to
9886                  * optimize and pull out duplcates.. but it does add more
9887                  * overhead. So for now... not!
9888                  */
9889                 at = TAILQ_FIRST(&asoc->sent_queue);
9890                 for (i = 0; i < cnt_of_skipped; i++) {
9891                         tp1 = TAILQ_NEXT(at, sctp_next);
9892                         if (tp1 == NULL)
9893                                 break;
9894                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9895                                 /* We don't report these */
9896                                 i--;
9897                                 at = tp1;
9898                                 continue;
9899                         }
9900                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9901                                 at->rec.data.fwd_tsn_cnt = 0;
9902                         }
9903                         strseq->stream = ntohs(at->rec.data.stream_number);
9904                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9905                         strseq++;
9906                         at = tp1;
9907                 }
9908         }
9909         return;
9910
9911 }
9912
9913 void
9914 sctp_send_sack(struct sctp_tcb *stcb)
9915 {
9916         /*-
9917          * Queue up a SACK or NR-SACK in the control queue.
9918          * We must first check to see if a SACK or NR-SACK is
9919          * somehow on the control queue.
9920          * If so, we will take and and remove the old one.
9921          */
9922         struct sctp_association *asoc;
9923         struct sctp_tmit_chunk *chk, *a_chk;
9924         struct sctp_sack_chunk *sack;
9925         struct sctp_nr_sack_chunk *nr_sack;
9926         struct sctp_gap_ack_block *gap_descriptor;
9927         struct sack_track *selector;
9928         int mergeable = 0;
9929         int offset;
9930         caddr_t limit;
9931         uint32_t *dup;
9932         int limit_reached = 0;
9933         unsigned int i, sel_start, siz, j, starting_index;
9934         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9935         int num_dups = 0;
9936         int space_req;
9937         uint32_t highest_tsn;
9938         uint8_t flags;
9939         uint8_t type;
9940
9941         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
9942             (stcb->asoc.peer_supports_nr_sack == 1)) {
9943                 type = SCTP_NR_SELECTIVE_ACK;
9944         } else {
9945                 type = SCTP_SELECTIVE_ACK;
9946         }
9947         a_chk = NULL;
9948         asoc = &stcb->asoc;
9949         SCTP_TCB_LOCK_ASSERT(stcb);
9950         if (asoc->last_data_chunk_from == NULL) {
9951                 /* Hmm we never received anything */
9952                 return;
9953         }
9954         sctp_slide_mapping_arrays(stcb);
9955         sctp_set_rwnd(stcb, asoc);
9956         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9957                 if (chk->rec.chunk_id.id == type) {
9958                         /* Hmm, found a sack already on queue, remove it */
9959                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9960                         asoc->ctrl_queue_cnt++;
9961                         a_chk = chk;
9962                         if (a_chk->data) {
9963                                 sctp_m_freem(a_chk->data);
9964                                 a_chk->data = NULL;
9965                         }
9966                         sctp_free_remote_addr(a_chk->whoTo);
9967                         a_chk->whoTo = NULL;
9968                         break;
9969                 }
9970         }
9971         if (a_chk == NULL) {
9972                 sctp_alloc_a_chunk(stcb, a_chk);
9973                 if (a_chk == NULL) {
9974                         /* No memory so we drop the idea, and set a timer */
9975                         if (stcb->asoc.delayed_ack) {
9976                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9977                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9978                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9979                                     stcb->sctp_ep, stcb, NULL);
9980                         } else {
9981                                 stcb->asoc.send_sack = 1;
9982                         }
9983                         return;
9984                 }
9985                 a_chk->copy_by_ref = 0;
9986                 a_chk->rec.chunk_id.id = type;
9987                 a_chk->rec.chunk_id.can_take_data = 1;
9988         }
9989         /* Clear our pkt counts */
9990         asoc->data_pkts_seen = 0;
9991
9992         a_chk->asoc = asoc;
9993         a_chk->snd_count = 0;
9994         a_chk->send_size = 0;   /* fill in later */
9995         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9996         a_chk->whoTo = NULL;
9997
9998         if ((asoc->numduptsns) ||
9999             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
10000             ) {
10001                 /*-
10002                  * Ok, we have some duplicates or the destination for the
10003                  * sack is unreachable, lets see if we can select an
10004                  * alternate than asoc->last_data_chunk_from
10005                  */
10006                 if ((!(asoc->last_data_chunk_from->dest_state &
10007                     SCTP_ADDR_NOT_REACHABLE)) &&
10008                     (asoc->used_alt_onsack > asoc->numnets)) {
10009                         /* We used an alt last time, don't this time */
10010                         a_chk->whoTo = NULL;
10011                 } else {
10012                         asoc->used_alt_onsack++;
10013                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10014                 }
10015                 if (a_chk->whoTo == NULL) {
10016                         /* Nope, no alternate */
10017                         a_chk->whoTo = asoc->last_data_chunk_from;
10018                         asoc->used_alt_onsack = 0;
10019                 }
10020         } else {
10021                 /*
10022                  * No duplicates so we use the last place we received data
10023                  * from.
10024                  */
10025                 asoc->used_alt_onsack = 0;
10026                 a_chk->whoTo = asoc->last_data_chunk_from;
10027         }
10028         if (a_chk->whoTo) {
10029                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10030         }
10031         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map, MAX_TSN)) {
10032                 highest_tsn = asoc->highest_tsn_inside_map;
10033         } else {
10034                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10035         }
10036         if (highest_tsn == asoc->cumulative_tsn) {
10037                 /* no gaps */
10038                 if (type == SCTP_SELECTIVE_ACK) {
10039                         space_req = sizeof(struct sctp_sack_chunk);
10040                 } else {
10041                         space_req = sizeof(struct sctp_nr_sack_chunk);
10042                 }
10043         } else {
10044                 /* gaps get a cluster */
10045                 space_req = MCLBYTES;
10046         }
10047         /* Ok now lets formulate a MBUF with our sack */
10048         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10049         if ((a_chk->data == NULL) ||
10050             (a_chk->whoTo == NULL)) {
10051                 /* rats, no mbuf memory */
10052                 if (a_chk->data) {
10053                         /* was a problem with the destination */
10054                         sctp_m_freem(a_chk->data);
10055                         a_chk->data = NULL;
10056                 }
10057                 sctp_free_a_chunk(stcb, a_chk);
10058                 /* sa_ignore NO_NULL_CHK */
10059                 if (stcb->asoc.delayed_ack) {
10060                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10061                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10062                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10063                             stcb->sctp_ep, stcb, NULL);
10064                 } else {
10065                         stcb->asoc.send_sack = 1;
10066                 }
10067                 return;
10068         }
10069         /* ok, lets go through and fill it in */
10070         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10071         space = M_TRAILINGSPACE(a_chk->data);
10072         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10073                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10074         }
10075         limit = mtod(a_chk->data, caddr_t);
10076         limit += space;
10077
10078         /* 0x01 is used by nonce for ecn */
10079         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10080             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10081             (asoc->peer_supports_ecn_nonce))
10082                 flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10083         else
10084                 flags = 0;
10085
10086         if ((asoc->sctp_cmt_on_off == 1) &&
10087             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10088                 /*-
10089                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10090                  * received, then set high bit to 1, else 0. Reset
10091                  * pkts_rcvd.
10092                  */
10093                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10094                 asoc->cmt_dac_pkts_rcvd = 0;
10095         }
10096 #ifdef SCTP_ASOCLOG_OF_TSNS
10097         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10098         stcb->asoc.cumack_log_atsnt++;
10099         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10100                 stcb->asoc.cumack_log_atsnt = 0;
10101         }
10102 #endif
10103         /* reset the readers interpretation */
10104         stcb->freed_by_sorcv_sincelast = 0;
10105
10106         if (type == SCTP_SELECTIVE_ACK) {
10107                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10108                 nr_sack = NULL;
10109                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10110                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10111                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10112                 } else {
10113                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10114                 }
10115         } else {
10116                 sack = NULL;
10117                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10118                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10119                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10120                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10121                 } else {
10122                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10123                 }
10124         }
10125
10126         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10127                 offset = 1;
10128                 /*-
10129                  * The base TSN is intialized to be the first TSN the peer
10130                  * will send us. If the cum-ack is behind this then when they
10131                  * send us the next in sequence it will mark the base_tsn bit.
10132                  * Thus we need to use the very first selector and the offset
10133                  * is 1. Our table is built for this case.
10134                  */
10135                 starting_index = 0;
10136                 sel_start = 0;
10137         } else {
10138                 /*-
10139                  * we skip the first selector  when the cum-ack is at or above the
10140                  * mapping array base. This is because the bits at the base or above
10141                  * are turned on and our first selector in the table assumes they are
10142                  * off. We thus will use the second selector (first is 0). We use
10143                  * the reverse of our macro to fix the offset, in bits, that our
10144                  * table is at. Note that this method assumes that the cum-tsn is
10145                  * within the first bit, i.e. its value is 0-7 which means the
10146                  * result to our offset will be either a 0 - -7. If the cumack
10147                  * is NOT in the first byte (0) (which it should be since we did
10148                  * a mapping array slide above) then we need to calculate the starting
10149                  * index i.e. which byte of the mapping array we should start at. We
10150                  * do this by dividing by 8 and pushing the remainder (mod) into offset.
10151                  * then we multiply the offset to be negative, since we need a negative
10152                  * offset into the selector table.
10153                  */
10154                 SCTP_CALC_TSN_TO_GAP(offset, asoc->cumulative_tsn, asoc->mapping_array_base_tsn);
10155                 if (offset > 7) {
10156                         starting_index = offset / 8;
10157                         offset = offset % 8;
10158                         printf("Strange starting index is %d offset:%d (not 0/x)\n",
10159                             starting_index, offset);
10160                 } else {
10161                         starting_index = 0;
10162                 }
10163                 /* We need a negative offset in our table */
10164                 offset *= -1;
10165                 sel_start = 1;
10166         }
10167         if (((type == SCTP_SELECTIVE_ACK) &&
10168             compare_with_wrap(highest_tsn, asoc->cumulative_tsn, MAX_TSN)) ||
10169             ((type == SCTP_NR_SELECTIVE_ACK) &&
10170             compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN))) {
10171                 /* we have a gap .. maybe */
10172                 for (i = starting_index; i < siz; i++) {
10173                         if (type == SCTP_SELECTIVE_ACK) {
10174                                 selector = &sack_array[asoc->mapping_array[i] | asoc->nr_mapping_array[i]];
10175                         } else {
10176                                 selector = &sack_array[asoc->mapping_array[i]];
10177                         }
10178                         if (mergeable && selector->right_edge) {
10179                                 /*
10180                                  * Backup, left and right edges were ok to
10181                                  * merge.
10182                                  */
10183                                 num_gap_blocks--;
10184                                 gap_descriptor--;
10185                         }
10186                         if (selector->num_entries == 0)
10187                                 mergeable = 0;
10188                         else {
10189                                 for (j = sel_start; j < selector->num_entries; j++) {
10190                                         if (mergeable && selector->right_edge) {
10191                                                 /*
10192                                                  * do a merge by NOT setting
10193                                                  * the left side
10194                                                  */
10195                                                 mergeable = 0;
10196                                         } else {
10197                                                 /*
10198                                                  * no merge, set the left
10199                                                  * side
10200                                                  */
10201                                                 mergeable = 0;
10202                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10203                                         }
10204                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10205                                         num_gap_blocks++;
10206                                         gap_descriptor++;
10207                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10208                                                 /* no more room */
10209                                                 limit_reached = 1;
10210                                                 break;
10211                                         }
10212                                 }
10213                                 if (selector->left_edge) {
10214                                         mergeable = 1;
10215                                 }
10216                         }
10217                         if (limit_reached) {
10218                                 /* Reached the limit stop */
10219                                 break;
10220                         }
10221                         sel_start = 0;
10222                         offset += 8;
10223                 }
10224         }
10225         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10226             (limit_reached == 0)) {
10227
10228                 mergeable = 0;
10229
10230                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn)
10231                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10232                 else
10233                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10234
10235                 if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10236                         offset = 1;
10237                         /*-
10238                         * cum-ack behind the mapping array, so we start and use all
10239                         * entries.
10240                         */
10241                         sel_start = 0;
10242                 } else {
10243                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10244                         /*-
10245                         * we skip the first one when the cum-ack is at or above the
10246                         * mapping array base. Note this only works if
10247                         */
10248                         sel_start = 1;
10249                 }
10250                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10251                         /* we have a gap .. maybe */
10252                         for (i = 0; i < siz; i++) {
10253                                 selector = &sack_array[asoc->nr_mapping_array[i]];
10254                                 if (mergeable && selector->right_edge) {
10255                                         /*
10256                                          * Backup, left and right edges were
10257                                          * ok to merge.
10258                                          */
10259                                         num_nr_gap_blocks--;
10260                                         gap_descriptor--;
10261                                 }
10262                                 if (selector->num_entries == 0)
10263                                         mergeable = 0;
10264                                 else {
10265                                         for (j = sel_start; j < selector->num_entries; j++) {
10266                                                 if (mergeable && selector->right_edge) {
10267                                                         /*
10268                                                          * do a merge by NOT
10269                                                          * setting the left
10270                                                          * side
10271                                                          */
10272                                                         mergeable = 0;
10273                                                 } else {
10274                                                         /*
10275                                                          * no merge, set the
10276                                                          * left side
10277                                                          */
10278                                                         mergeable = 0;
10279                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10280                                                 }
10281                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10282                                                 num_nr_gap_blocks++;
10283                                                 gap_descriptor++;
10284                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10285                                                         /* no more room */
10286                                                         limit_reached = 1;
10287                                                         break;
10288                                                 }
10289                                         }
10290                                         if (selector->left_edge) {
10291                                                 mergeable = 1;
10292                                         }
10293                                 }
10294                                 if (limit_reached) {
10295                                         /* Reached the limit stop */
10296                                         break;
10297                                 }
10298                                 sel_start = 0;
10299                                 offset += 8;
10300                         }
10301                 }
10302         }
10303         /* now we must add any dups we are going to report. */
10304         if ((limit_reached == 0) && (asoc->numduptsns)) {
10305                 dup = (uint32_t *) gap_descriptor;
10306                 for (i = 0; i < asoc->numduptsns; i++) {
10307                         *dup = htonl(asoc->dup_tsns[i]);
10308                         dup++;
10309                         num_dups++;
10310                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10311                                 /* no more room */
10312                                 break;
10313                         }
10314                 }
10315                 asoc->numduptsns = 0;
10316         }
10317         /*
10318          * now that the chunk is prepared queue it to the control chunk
10319          * queue.
10320          */
10321         if (type == SCTP_SELECTIVE_ACK) {
10322                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10323                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10324                     num_dups * sizeof(int32_t);
10325                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10326                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10327                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10328                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10329                 sack->sack.num_dup_tsns = htons(num_dups);
10330                 sack->ch.chunk_type = type;
10331                 sack->ch.chunk_flags = flags;
10332                 sack->ch.chunk_length = htons(a_chk->send_size);
10333         } else {
10334                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10335                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10336                     num_dups * sizeof(int32_t);
10337                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10338                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10339                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10340                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10341                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10342                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10343                 nr_sack->nr_sack.reserved = 0;
10344                 nr_sack->ch.chunk_type = type;
10345                 nr_sack->ch.chunk_flags = flags;
10346                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10347         }
10348         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10349         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10350         asoc->ctrl_queue_cnt++;
10351         asoc->send_sack = 0;
10352         SCTP_STAT_INCR(sctps_sendsacks);
10353         return;
10354 }
10355
10356 void
10357 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10358 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10359     SCTP_UNUSED
10360 #endif
10361 )
10362 {
10363         struct mbuf *m_abort;
10364         struct mbuf *m_out = NULL, *m_end = NULL;
10365         struct sctp_abort_chunk *abort = NULL;
10366         int sz;
10367         uint32_t auth_offset = 0;
10368         struct sctp_auth_chunk *auth = NULL;
10369
10370         /*-
10371          * Add an AUTH chunk, if chunk requires it and save the offset into
10372          * the chain for AUTH
10373          */
10374         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10375             stcb->asoc.peer_auth_chunks)) {
10376                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10377                     stcb, SCTP_ABORT_ASSOCIATION);
10378                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10379         }
10380         SCTP_TCB_LOCK_ASSERT(stcb);
10381         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10382         if (m_abort == NULL) {
10383                 /* no mbuf's */
10384                 if (m_out)
10385                         sctp_m_freem(m_out);
10386                 return;
10387         }
10388         /* link in any error */
10389         SCTP_BUF_NEXT(m_abort) = operr;
10390         sz = 0;
10391         if (operr) {
10392                 struct mbuf *n;
10393
10394                 n = operr;
10395                 while (n) {
10396                         sz += SCTP_BUF_LEN(n);
10397                         n = SCTP_BUF_NEXT(n);
10398                 }
10399         }
10400         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10401         if (m_out == NULL) {
10402                 /* NO Auth chunk prepended, so reserve space in front */
10403                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10404                 m_out = m_abort;
10405         } else {
10406                 /* Put AUTH chunk at the front of the chain */
10407                 SCTP_BUF_NEXT(m_end) = m_abort;
10408         }
10409
10410         /* fill in the ABORT chunk */
10411         abort = mtod(m_abort, struct sctp_abort_chunk *);
10412         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10413         abort->ch.chunk_flags = 0;
10414         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10415
10416         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10417             stcb->asoc.primary_destination,
10418             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10419             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10420             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10421             stcb->asoc.primary_destination->port, so_locked, NULL);
10422         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10423 }
10424
10425 void
10426 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10427     struct sctp_nets *net,
10428     int reflect_vtag)
10429 {
10430         /* formulate and SEND a SHUTDOWN-COMPLETE */
10431         struct mbuf *m_shutdown_comp;
10432         struct sctp_shutdown_complete_chunk *shutdown_complete;
10433         uint32_t vtag;
10434         uint8_t flags;
10435
10436         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10437         if (m_shutdown_comp == NULL) {
10438                 /* no mbuf's */
10439                 return;
10440         }
10441         if (reflect_vtag) {
10442                 flags = SCTP_HAD_NO_TCB;
10443                 vtag = stcb->asoc.my_vtag;
10444         } else {
10445                 flags = 0;
10446                 vtag = stcb->asoc.peer_vtag;
10447         }
10448         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10449         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10450         shutdown_complete->ch.chunk_flags = flags;
10451         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10452         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10453         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10454             (struct sockaddr *)&net->ro._l_addr,
10455             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10456             stcb->sctp_ep->sctp_lport, stcb->rport,
10457             htonl(vtag),
10458             net->port, SCTP_SO_NOT_LOCKED, NULL);
10459         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10460         return;
10461 }
10462
10463 void
10464 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10465     uint32_t vrf_id, uint16_t port)
10466 {
10467         /* formulate and SEND a SHUTDOWN-COMPLETE */
10468         struct mbuf *o_pak;
10469         struct mbuf *mout;
10470         struct ip *iph, *iph_out;
10471         struct udphdr *udp = NULL;
10472
10473 #ifdef INET6
10474         struct ip6_hdr *ip6, *ip6_out;
10475
10476 #endif
10477         int offset_out, len, mlen;
10478         struct sctp_shutdown_complete_msg *comp_cp;
10479
10480         iph = mtod(m, struct ip *);
10481         switch (iph->ip_v) {
10482         case IPVERSION:
10483                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10484                 break;
10485 #ifdef INET6
10486         case IPV6_VERSION >> 4:
10487                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10488                 break;
10489 #endif
10490         default:
10491                 return;
10492         }
10493         if (port) {
10494                 len += sizeof(struct udphdr);
10495         }
10496         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10497         if (mout == NULL) {
10498                 return;
10499         }
10500         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10501         SCTP_BUF_LEN(mout) = len;
10502         SCTP_BUF_NEXT(mout) = NULL;
10503         iph_out = NULL;
10504 #ifdef INET6
10505         ip6_out = NULL;
10506 #endif
10507         offset_out = 0;
10508
10509         switch (iph->ip_v) {
10510         case IPVERSION:
10511                 iph_out = mtod(mout, struct ip *);
10512
10513                 /* Fill in the IP header for the ABORT */
10514                 iph_out->ip_v = IPVERSION;
10515                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10516                 iph_out->ip_tos = (u_char)0;
10517                 iph_out->ip_id = 0;
10518                 iph_out->ip_off = 0;
10519                 iph_out->ip_ttl = MAXTTL;
10520                 if (port) {
10521                         iph_out->ip_p = IPPROTO_UDP;
10522                 } else {
10523                         iph_out->ip_p = IPPROTO_SCTP;
10524                 }
10525                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10526                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10527
10528                 /* let IP layer calculate this */
10529                 iph_out->ip_sum = 0;
10530                 offset_out += sizeof(*iph_out);
10531                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10532                     (caddr_t)iph_out + offset_out);
10533                 break;
10534 #ifdef INET6
10535         case IPV6_VERSION >> 4:
10536                 ip6 = (struct ip6_hdr *)iph;
10537                 ip6_out = mtod(mout, struct ip6_hdr *);
10538
10539                 /* Fill in the IPv6 header for the ABORT */
10540                 ip6_out->ip6_flow = ip6->ip6_flow;
10541                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10542                 if (port) {
10543                         ip6_out->ip6_nxt = IPPROTO_UDP;
10544                 } else {
10545                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10546                 }
10547                 ip6_out->ip6_src = ip6->ip6_dst;
10548                 ip6_out->ip6_dst = ip6->ip6_src;
10549                 /*
10550                  * ?? The old code had both the iph len + payload, I think
10551                  * this is wrong and would never have worked
10552                  */
10553                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10554                 offset_out += sizeof(*ip6_out);
10555                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10556                     (caddr_t)ip6_out + offset_out);
10557                 break;
10558 #endif                          /* INET6 */
10559         default:
10560                 /* Currently not supported. */
10561                 sctp_m_freem(mout);
10562                 return;
10563         }
10564         if (port) {
10565                 udp = (struct udphdr *)comp_cp;
10566                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10567                 udp->uh_dport = port;
10568                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10569                 if (iph_out)
10570                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10571                 offset_out += sizeof(struct udphdr);
10572                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10573         }
10574         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10575                 /* no mbuf's */
10576                 sctp_m_freem(mout);
10577                 return;
10578         }
10579         /* Now copy in and fill in the ABORT tags etc. */
10580         comp_cp->sh.src_port = sh->dest_port;
10581         comp_cp->sh.dest_port = sh->src_port;
10582         comp_cp->sh.checksum = 0;
10583         comp_cp->sh.v_tag = sh->v_tag;
10584         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10585         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10586         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10587
10588         if (iph_out != NULL) {
10589                 sctp_route_t ro;
10590                 int ret;
10591
10592                 mlen = SCTP_BUF_LEN(mout);
10593                 bzero(&ro, sizeof ro);
10594                 /* set IPv4 length */
10595                 iph_out->ip_len = mlen;
10596 #ifdef  SCTP_PACKET_LOGGING
10597                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10598                         sctp_packet_log(mout, mlen);
10599 #endif
10600                 if (port) {
10601 #if defined(SCTP_WITH_NO_CSUM)
10602                         SCTP_STAT_INCR(sctps_sendnocrc);
10603 #else
10604                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10605                         SCTP_STAT_INCR(sctps_sendswcrc);
10606 #endif
10607                         SCTP_ENABLE_UDP_CSUM(mout);
10608                 } else {
10609 #if defined(SCTP_WITH_NO_CSUM)
10610                         SCTP_STAT_INCR(sctps_sendnocrc);
10611 #else
10612                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10613                         mout->m_pkthdr.csum_data = 0;
10614                         SCTP_STAT_INCR(sctps_sendhwcrc);
10615 #endif
10616                 }
10617                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10618                 /* out it goes */
10619                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10620
10621                 /* Free the route if we got one back */
10622                 if (ro.ro_rt)
10623                         RTFREE(ro.ro_rt);
10624         }
10625 #ifdef INET6
10626         if (ip6_out != NULL) {
10627                 struct route_in6 ro;
10628                 int ret;
10629                 struct ifnet *ifp = NULL;
10630
10631                 bzero(&ro, sizeof(ro));
10632                 mlen = SCTP_BUF_LEN(mout);
10633 #ifdef  SCTP_PACKET_LOGGING
10634                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10635                         sctp_packet_log(mout, mlen);
10636 #endif
10637                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10638                 if (port) {
10639 #if defined(SCTP_WITH_NO_CSUM)
10640                         SCTP_STAT_INCR(sctps_sendnocrc);
10641 #else
10642                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10643                         SCTP_STAT_INCR(sctps_sendswcrc);
10644 #endif
10645                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10646                                 udp->uh_sum = 0xffff;
10647                         }
10648                 } else {
10649 #if defined(SCTP_WITH_NO_CSUM)
10650                         SCTP_STAT_INCR(sctps_sendnocrc);
10651 #else
10652                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10653                         mout->m_pkthdr.csum_data = 0;
10654                         SCTP_STAT_INCR(sctps_sendhwcrc);
10655 #endif
10656                 }
10657                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
10658
10659                 /* Free the route if we got one back */
10660                 if (ro.ro_rt)
10661                         RTFREE(ro.ro_rt);
10662         }
10663 #endif
10664         SCTP_STAT_INCR(sctps_sendpackets);
10665         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10666         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10667         return;
10668
10669 }
10670
10671 static struct sctp_nets *
10672 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10673 {
10674         struct sctp_nets *net, *hnet;
10675         int ms_goneby, highest_ms, state_overide = 0;
10676
10677         (void)SCTP_GETTIME_TIMEVAL(now);
10678         highest_ms = 0;
10679         hnet = NULL;
10680         SCTP_TCB_LOCK_ASSERT(stcb);
10681         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10682                 if (
10683                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10684                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10685                     ) {
10686                         /*
10687                          * Skip this guy from consideration if HB is off AND
10688                          * its confirmed
10689                          */
10690                         continue;
10691                 }
10692                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10693                         /* skip this dest net from consideration */
10694                         continue;
10695                 }
10696                 if (net->last_sent_time.tv_sec) {
10697                         /* Sent to so we subtract */
10698                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10699                 } else
10700                         /* Never been sent to */
10701                         ms_goneby = 0x7fffffff;
10702                 /*-
10703                  * When the address state is unconfirmed but still
10704                  * considered reachable, we HB at a higher rate. Once it
10705                  * goes confirmed OR reaches the "unreachable" state, thenw
10706                  * we cut it back to HB at a more normal pace.
10707                  */
10708                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10709                         state_overide = 1;
10710                 } else {
10711                         state_overide = 0;
10712                 }
10713
10714                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10715                     (ms_goneby > highest_ms)) {
10716                         highest_ms = ms_goneby;
10717                         hnet = net;
10718                 }
10719         }
10720         if (hnet &&
10721             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10722                 state_overide = 1;
10723         } else {
10724                 state_overide = 0;
10725         }
10726
10727         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10728                 /*-
10729                  * Found the one with longest delay bounds OR it is
10730                  * unconfirmed and still not marked unreachable.
10731                  */
10732                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10733 #ifdef SCTP_DEBUG
10734                 if (hnet) {
10735                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10736                             (struct sockaddr *)&hnet->ro._l_addr);
10737                 } else {
10738                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10739                 }
10740 #endif
10741                 /* update the timer now */
10742                 hnet->last_sent_time = *now;
10743                 return (hnet);
10744         }
10745         /* Nothing to HB */
10746         return (NULL);
10747 }
10748
10749 int
10750 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10751 {
10752         struct sctp_tmit_chunk *chk;
10753         struct sctp_nets *net;
10754         struct sctp_heartbeat_chunk *hb;
10755         struct timeval now;
10756         struct sockaddr_in *sin;
10757         struct sockaddr_in6 *sin6;
10758
10759         SCTP_TCB_LOCK_ASSERT(stcb);
10760         if (user_req == 0) {
10761                 net = sctp_select_hb_destination(stcb, &now);
10762                 if (net == NULL) {
10763                         /*-
10764                          * All our busy none to send to, just start the
10765                          * timer again.
10766                          */
10767                         if (stcb->asoc.state == 0) {
10768                                 return (0);
10769                         }
10770                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10771                             stcb->sctp_ep,
10772                             stcb,
10773                             net);
10774                         return (0);
10775                 }
10776         } else {
10777                 net = u_net;
10778                 if (net == NULL) {
10779                         return (0);
10780                 }
10781                 (void)SCTP_GETTIME_TIMEVAL(&now);
10782         }
10783         sin = (struct sockaddr_in *)&net->ro._l_addr;
10784         if (sin->sin_family != AF_INET) {
10785                 if (sin->sin_family != AF_INET6) {
10786                         /* huh */
10787                         return (0);
10788                 }
10789         }
10790         sctp_alloc_a_chunk(stcb, chk);
10791         if (chk == NULL) {
10792                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10793                 return (0);
10794         }
10795         chk->copy_by_ref = 0;
10796         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10797         chk->rec.chunk_id.can_take_data = 1;
10798         chk->asoc = &stcb->asoc;
10799         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10800
10801         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10802         if (chk->data == NULL) {
10803                 sctp_free_a_chunk(stcb, chk);
10804                 return (0);
10805         }
10806         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10807         SCTP_BUF_LEN(chk->data) = chk->send_size;
10808         chk->sent = SCTP_DATAGRAM_UNSENT;
10809         chk->snd_count = 0;
10810         chk->whoTo = net;
10811         atomic_add_int(&chk->whoTo->ref_count, 1);
10812         /* Now we have a mbuf that we can fill in with the details */
10813         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10814         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10815         /* fill out chunk header */
10816         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10817         hb->ch.chunk_flags = 0;
10818         hb->ch.chunk_length = htons(chk->send_size);
10819         /* Fill out hb parameter */
10820         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10821         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10822         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10823         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10824         /* Did our user request this one, put it in */
10825         hb->heartbeat.hb_info.user_req = user_req;
10826         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10827         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10828         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10829                 /*
10830                  * we only take from the entropy pool if the address is not
10831                  * confirmed.
10832                  */
10833                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10834                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10835         } else {
10836                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10837                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10838         }
10839         if (sin->sin_family == AF_INET) {
10840                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10841         } else if (sin->sin_family == AF_INET6) {
10842                 /* We leave the scope the way it is in our lookup table. */
10843                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10844                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10845         } else {
10846                 /* huh compiler bug */
10847                 return (0);
10848         }
10849
10850         /*
10851          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10852          * PF-heartbeats.  Because of this, threshold management is done by
10853          * the t3 timer handler, and does not need to be done upon the send
10854          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10855          * heartbeat is being sent is in PF state, do NOT do threshold
10856          * management.
10857          */
10858         if ((stcb->asoc.sctp_cmt_pf == 0) ||
10859             ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10860                 /* ok we have a destination that needs a beat */
10861                 /* lets do the theshold management Qiaobing style */
10862                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10863                     stcb->asoc.max_send_times)) {
10864                         /*-
10865                          * we have lost the association, in a way this is
10866                          * quite bad since we really are one less time since
10867                          * we really did not send yet. This is the down side
10868                          * to the Q's style as defined in the RFC and not my
10869                          * alternate style defined in the RFC.
10870                          */
10871                         if (chk->data != NULL) {
10872                                 sctp_m_freem(chk->data);
10873                                 chk->data = NULL;
10874                         }
10875                         /*
10876                          * Here we do NOT use the macro since the
10877                          * association is now gone.
10878                          */
10879                         if (chk->whoTo) {
10880                                 sctp_free_remote_addr(chk->whoTo);
10881                                 chk->whoTo = NULL;
10882                         }
10883                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10884                         return (-1);
10885                 }
10886         }
10887         net->hb_responded = 0;
10888         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10889         stcb->asoc.ctrl_queue_cnt++;
10890         SCTP_STAT_INCR(sctps_sendheartbeat);
10891         /*-
10892          * Call directly med level routine to put out the chunk. It will
10893          * always tumble out control chunks aka HB but it may even tumble
10894          * out data too.
10895          */
10896         return (1);
10897 }
10898
10899 void
10900 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10901     uint32_t high_tsn)
10902 {
10903         struct sctp_association *asoc;
10904         struct sctp_ecne_chunk *ecne;
10905         struct sctp_tmit_chunk *chk;
10906
10907         asoc = &stcb->asoc;
10908         SCTP_TCB_LOCK_ASSERT(stcb);
10909         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10910                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10911                         /* found a previous ECN_ECHO update it if needed */
10912                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10913                         ecne->tsn = htonl(high_tsn);
10914                         return;
10915                 }
10916         }
10917         /* nope could not find one to update so we must build one */
10918         sctp_alloc_a_chunk(stcb, chk);
10919         if (chk == NULL) {
10920                 return;
10921         }
10922         chk->copy_by_ref = 0;
10923         SCTP_STAT_INCR(sctps_sendecne);
10924         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10925         chk->rec.chunk_id.can_take_data = 0;
10926         chk->asoc = &stcb->asoc;
10927         chk->send_size = sizeof(struct sctp_ecne_chunk);
10928         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10929         if (chk->data == NULL) {
10930                 sctp_free_a_chunk(stcb, chk);
10931                 return;
10932         }
10933         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10934         SCTP_BUF_LEN(chk->data) = chk->send_size;
10935         chk->sent = SCTP_DATAGRAM_UNSENT;
10936         chk->snd_count = 0;
10937         chk->whoTo = net;
10938         atomic_add_int(&chk->whoTo->ref_count, 1);
10939         stcb->asoc.ecn_echo_cnt_onq++;
10940         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10941         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10942         ecne->ch.chunk_flags = 0;
10943         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10944         ecne->tsn = htonl(high_tsn);
10945         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10946         asoc->ctrl_queue_cnt++;
10947 }
10948
10949 void
10950 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10951     struct mbuf *m, int iphlen, int bad_crc)
10952 {
10953         struct sctp_association *asoc;
10954         struct sctp_pktdrop_chunk *drp;
10955         struct sctp_tmit_chunk *chk;
10956         uint8_t *datap;
10957         int len;
10958         int was_trunc = 0;
10959         struct ip *iph;
10960
10961 #ifdef INET6
10962         struct ip6_hdr *ip6h;
10963
10964 #endif
10965         int fullsz = 0, extra = 0;
10966         long spc;
10967         int offset;
10968         struct sctp_chunkhdr *ch, chunk_buf;
10969         unsigned int chk_length;
10970
10971         if (!stcb) {
10972                 return;
10973         }
10974         asoc = &stcb->asoc;
10975         SCTP_TCB_LOCK_ASSERT(stcb);
10976         if (asoc->peer_supports_pktdrop == 0) {
10977                 /*-
10978                  * peer must declare support before I send one.
10979                  */
10980                 return;
10981         }
10982         if (stcb->sctp_socket == NULL) {
10983                 return;
10984         }
10985         sctp_alloc_a_chunk(stcb, chk);
10986         if (chk == NULL) {
10987                 return;
10988         }
10989         chk->copy_by_ref = 0;
10990         iph = mtod(m, struct ip *);
10991         if (iph == NULL) {
10992                 sctp_free_a_chunk(stcb, chk);
10993                 return;
10994         }
10995         switch (iph->ip_v) {
10996         case IPVERSION:
10997                 /* IPv4 */
10998                 len = chk->send_size = iph->ip_len;
10999                 break;
11000 #ifdef INET6
11001         case IPV6_VERSION >> 4:
11002                 /* IPv6 */
11003                 ip6h = mtod(m, struct ip6_hdr *);
11004                 len = chk->send_size = htons(ip6h->ip6_plen);
11005                 break;
11006 #endif
11007         default:
11008                 return;
11009         }
11010         /* Validate that we do not have an ABORT in here. */
11011         offset = iphlen + sizeof(struct sctphdr);
11012         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11013             sizeof(*ch), (uint8_t *) & chunk_buf);
11014         while (ch != NULL) {
11015                 chk_length = ntohs(ch->chunk_length);
11016                 if (chk_length < sizeof(*ch)) {
11017                         /* break to abort land */
11018                         break;
11019                 }
11020                 switch (ch->chunk_type) {
11021                 case SCTP_PACKET_DROPPED:
11022                 case SCTP_ABORT_ASSOCIATION:
11023                 case SCTP_INITIATION_ACK:
11024                         /**
11025                          * We don't respond with an PKT-DROP to an ABORT
11026                          * or PKT-DROP. We also do not respond to an
11027                          * INIT-ACK, because we can't know if the initiation
11028                          * tag is correct or not.
11029                          */
11030                         sctp_free_a_chunk(stcb, chk);
11031                         return;
11032                 default:
11033                         break;
11034                 }
11035                 offset += SCTP_SIZE32(chk_length);
11036                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11037                     sizeof(*ch), (uint8_t *) & chunk_buf);
11038         }
11039
11040         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11041             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11042                 /*
11043                  * only send 1 mtu worth, trim off the excess on the end.
11044                  */
11045                 fullsz = len - extra;
11046                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11047                 was_trunc = 1;
11048         }
11049         chk->asoc = &stcb->asoc;
11050         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11051         if (chk->data == NULL) {
11052 jump_out:
11053                 sctp_free_a_chunk(stcb, chk);
11054                 return;
11055         }
11056         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11057         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11058         if (drp == NULL) {
11059                 sctp_m_freem(chk->data);
11060                 chk->data = NULL;
11061                 goto jump_out;
11062         }
11063         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11064             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11065         chk->book_size_scale = 0;
11066         if (was_trunc) {
11067                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11068                 drp->trunc_len = htons(fullsz);
11069                 /*
11070                  * Len is already adjusted to size minus overhead above take
11071                  * out the pkt_drop chunk itself from it.
11072                  */
11073                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11074                 len = chk->send_size;
11075         } else {
11076                 /* no truncation needed */
11077                 drp->ch.chunk_flags = 0;
11078                 drp->trunc_len = htons(0);
11079         }
11080         if (bad_crc) {
11081                 drp->ch.chunk_flags |= SCTP_BADCRC;
11082         }
11083         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11084         SCTP_BUF_LEN(chk->data) = chk->send_size;
11085         chk->sent = SCTP_DATAGRAM_UNSENT;
11086         chk->snd_count = 0;
11087         if (net) {
11088                 /* we should hit here */
11089                 chk->whoTo = net;
11090         } else {
11091                 chk->whoTo = asoc->primary_destination;
11092         }
11093         atomic_add_int(&chk->whoTo->ref_count, 1);
11094         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11095         chk->rec.chunk_id.can_take_data = 1;
11096         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11097         drp->ch.chunk_length = htons(chk->send_size);
11098         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11099         if (spc < 0) {
11100                 spc = 0;
11101         }
11102         drp->bottle_bw = htonl(spc);
11103         if (asoc->my_rwnd) {
11104                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11105                     asoc->size_on_all_streams +
11106                     asoc->my_rwnd_control_len +
11107                     stcb->sctp_socket->so_rcv.sb_cc);
11108         } else {
11109                 /*-
11110                  * If my rwnd is 0, possibly from mbuf depletion as well as
11111                  * space used, tell the peer there is NO space aka onq == bw
11112                  */
11113                 drp->current_onq = htonl(spc);
11114         }
11115         drp->reserved = 0;
11116         datap = drp->data;
11117         m_copydata(m, iphlen, len, (caddr_t)datap);
11118         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11119         asoc->ctrl_queue_cnt++;
11120 }
11121
11122 void
11123 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11124 {
11125         struct sctp_association *asoc;
11126         struct sctp_cwr_chunk *cwr;
11127         struct sctp_tmit_chunk *chk;
11128
11129         asoc = &stcb->asoc;
11130         SCTP_TCB_LOCK_ASSERT(stcb);
11131         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11132                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11133                         /* found a previous ECN_CWR update it if needed */
11134                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11135                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11136                             MAX_TSN)) {
11137                                 cwr->tsn = htonl(high_tsn);
11138                         }
11139                         return;
11140                 }
11141         }
11142         /* nope could not find one to update so we must build one */
11143         sctp_alloc_a_chunk(stcb, chk);
11144         if (chk == NULL) {
11145                 return;
11146         }
11147         chk->copy_by_ref = 0;
11148         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11149         chk->rec.chunk_id.can_take_data = 1;
11150         chk->asoc = &stcb->asoc;
11151         chk->send_size = sizeof(struct sctp_cwr_chunk);
11152         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11153         if (chk->data == NULL) {
11154                 sctp_free_a_chunk(stcb, chk);
11155                 return;
11156         }
11157         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11158         SCTP_BUF_LEN(chk->data) = chk->send_size;
11159         chk->sent = SCTP_DATAGRAM_UNSENT;
11160         chk->snd_count = 0;
11161         chk->whoTo = net;
11162         atomic_add_int(&chk->whoTo->ref_count, 1);
11163         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11164         cwr->ch.chunk_type = SCTP_ECN_CWR;
11165         cwr->ch.chunk_flags = 0;
11166         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11167         cwr->tsn = htonl(high_tsn);
11168         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11169         asoc->ctrl_queue_cnt++;
11170 }
11171
11172 void
11173 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11174     int number_entries, uint16_t * list,
11175     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11176 {
11177         int len, old_len, i;
11178         struct sctp_stream_reset_out_request *req_out;
11179         struct sctp_chunkhdr *ch;
11180
11181         ch = mtod(chk->data, struct sctp_chunkhdr *);
11182
11183
11184         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11185
11186         /* get to new offset for the param. */
11187         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11188         /* now how long will this param be? */
11189         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11190         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11191         req_out->ph.param_length = htons(len);
11192         req_out->request_seq = htonl(seq);
11193         req_out->response_seq = htonl(resp_seq);
11194         req_out->send_reset_at_tsn = htonl(last_sent);
11195         if (number_entries) {
11196                 for (i = 0; i < number_entries; i++) {
11197                         req_out->list_of_streams[i] = htons(list[i]);
11198                 }
11199         }
11200         if (SCTP_SIZE32(len) > len) {
11201                 /*-
11202                  * Need to worry about the pad we may end up adding to the
11203                  * end. This is easy since the struct is either aligned to 4
11204                  * bytes or 2 bytes off.
11205                  */
11206                 req_out->list_of_streams[number_entries] = 0;
11207         }
11208         /* now fix the chunk length */
11209         ch->chunk_length = htons(len + old_len);
11210         chk->book_size = len + old_len;
11211         chk->book_size_scale = 0;
11212         chk->send_size = SCTP_SIZE32(chk->book_size);
11213         SCTP_BUF_LEN(chk->data) = chk->send_size;
11214         return;
11215 }
11216
11217
11218 void
11219 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11220     int number_entries, uint16_t * list,
11221     uint32_t seq)
11222 {
11223         int len, old_len, i;
11224         struct sctp_stream_reset_in_request *req_in;
11225         struct sctp_chunkhdr *ch;
11226
11227         ch = mtod(chk->data, struct sctp_chunkhdr *);
11228
11229
11230         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11231
11232         /* get to new offset for the param. */
11233         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11234         /* now how long will this param be? */
11235         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11236         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11237         req_in->ph.param_length = htons(len);
11238         req_in->request_seq = htonl(seq);
11239         if (number_entries) {
11240                 for (i = 0; i < number_entries; i++) {
11241                         req_in->list_of_streams[i] = htons(list[i]);
11242                 }
11243         }
11244         if (SCTP_SIZE32(len) > len) {
11245                 /*-
11246                  * Need to worry about the pad we may end up adding to the
11247                  * end. This is easy since the struct is either aligned to 4
11248                  * bytes or 2 bytes off.
11249                  */
11250                 req_in->list_of_streams[number_entries] = 0;
11251         }
11252         /* now fix the chunk length */
11253         ch->chunk_length = htons(len + old_len);
11254         chk->book_size = len + old_len;
11255         chk->book_size_scale = 0;
11256         chk->send_size = SCTP_SIZE32(chk->book_size);
11257         SCTP_BUF_LEN(chk->data) = chk->send_size;
11258         return;
11259 }
11260
11261
11262 void
11263 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11264     uint32_t seq)
11265 {
11266         int len, old_len;
11267         struct sctp_stream_reset_tsn_request *req_tsn;
11268         struct sctp_chunkhdr *ch;
11269
11270         ch = mtod(chk->data, struct sctp_chunkhdr *);
11271
11272
11273         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11274
11275         /* get to new offset for the param. */
11276         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11277         /* now how long will this param be? */
11278         len = sizeof(struct sctp_stream_reset_tsn_request);
11279         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11280         req_tsn->ph.param_length = htons(len);
11281         req_tsn->request_seq = htonl(seq);
11282
11283         /* now fix the chunk length */
11284         ch->chunk_length = htons(len + old_len);
11285         chk->send_size = len + old_len;
11286         chk->book_size = SCTP_SIZE32(chk->send_size);
11287         chk->book_size_scale = 0;
11288         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11289         return;
11290 }
11291
11292 void
11293 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11294     uint32_t resp_seq, uint32_t result)
11295 {
11296         int len, old_len;
11297         struct sctp_stream_reset_response *resp;
11298         struct sctp_chunkhdr *ch;
11299
11300         ch = mtod(chk->data, struct sctp_chunkhdr *);
11301
11302
11303         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11304
11305         /* get to new offset for the param. */
11306         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11307         /* now how long will this param be? */
11308         len = sizeof(struct sctp_stream_reset_response);
11309         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11310         resp->ph.param_length = htons(len);
11311         resp->response_seq = htonl(resp_seq);
11312         resp->result = ntohl(result);
11313
11314         /* now fix the chunk length */
11315         ch->chunk_length = htons(len + old_len);
11316         chk->book_size = len + old_len;
11317         chk->book_size_scale = 0;
11318         chk->send_size = SCTP_SIZE32(chk->book_size);
11319         SCTP_BUF_LEN(chk->data) = chk->send_size;
11320         return;
11321
11322 }
11323
11324
11325 void
11326 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11327     uint32_t resp_seq, uint32_t result,
11328     uint32_t send_una, uint32_t recv_next)
11329 {
11330         int len, old_len;
11331         struct sctp_stream_reset_response_tsn *resp;
11332         struct sctp_chunkhdr *ch;
11333
11334         ch = mtod(chk->data, struct sctp_chunkhdr *);
11335
11336
11337         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11338
11339         /* get to new offset for the param. */
11340         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11341         /* now how long will this param be? */
11342         len = sizeof(struct sctp_stream_reset_response_tsn);
11343         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11344         resp->ph.param_length = htons(len);
11345         resp->response_seq = htonl(resp_seq);
11346         resp->result = htonl(result);
11347         resp->senders_next_tsn = htonl(send_una);
11348         resp->receivers_next_tsn = htonl(recv_next);
11349
11350         /* now fix the chunk length */
11351         ch->chunk_length = htons(len + old_len);
11352         chk->book_size = len + old_len;
11353         chk->send_size = SCTP_SIZE32(chk->book_size);
11354         chk->book_size_scale = 0;
11355         SCTP_BUF_LEN(chk->data) = chk->send_size;
11356         return;
11357 }
11358
11359 static void
11360 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11361     uint32_t seq,
11362     uint16_t adding)
11363 {
11364         int len, old_len;
11365         struct sctp_chunkhdr *ch;
11366         struct sctp_stream_reset_add_strm *addstr;
11367
11368         ch = mtod(chk->data, struct sctp_chunkhdr *);
11369         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11370
11371         /* get to new offset for the param. */
11372         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11373         /* now how long will this param be? */
11374         len = sizeof(struct sctp_stream_reset_add_strm);
11375
11376         /* Fill it out. */
11377         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11378         addstr->ph.param_length = htons(len);
11379         addstr->request_seq = htonl(seq);
11380         addstr->number_of_streams = htons(adding);
11381         addstr->reserved = 0;
11382
11383         /* now fix the chunk length */
11384         ch->chunk_length = htons(len + old_len);
11385         chk->send_size = len + old_len;
11386         chk->book_size = SCTP_SIZE32(chk->send_size);
11387         chk->book_size_scale = 0;
11388         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11389         return;
11390 }
11391
11392 int
11393 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11394     int number_entries, uint16_t * list,
11395     uint8_t send_out_req,
11396     uint32_t resp_seq,
11397     uint8_t send_in_req,
11398     uint8_t send_tsn_req,
11399     uint8_t add_stream,
11400     uint16_t adding
11401 )
11402 {
11403
11404         struct sctp_association *asoc;
11405         struct sctp_tmit_chunk *chk;
11406         struct sctp_chunkhdr *ch;
11407         uint32_t seq;
11408
11409         asoc = &stcb->asoc;
11410         if (asoc->stream_reset_outstanding) {
11411                 /*-
11412                  * Already one pending, must get ACK back to clear the flag.
11413                  */
11414                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11415                 return (EBUSY);
11416         }
11417         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11418             (add_stream == 0)) {
11419                 /* nothing to do */
11420                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11421                 return (EINVAL);
11422         }
11423         if (send_tsn_req && (send_out_req || send_in_req)) {
11424                 /* error, can't do that */
11425                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11426                 return (EINVAL);
11427         }
11428         sctp_alloc_a_chunk(stcb, chk);
11429         if (chk == NULL) {
11430                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11431                 return (ENOMEM);
11432         }
11433         chk->copy_by_ref = 0;
11434         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11435         chk->rec.chunk_id.can_take_data = 0;
11436         chk->asoc = &stcb->asoc;
11437         chk->book_size = sizeof(struct sctp_chunkhdr);
11438         chk->send_size = SCTP_SIZE32(chk->book_size);
11439         chk->book_size_scale = 0;
11440
11441         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11442         if (chk->data == NULL) {
11443                 sctp_free_a_chunk(stcb, chk);
11444                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11445                 return (ENOMEM);
11446         }
11447         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11448
11449         /* setup chunk parameters */
11450         chk->sent = SCTP_DATAGRAM_UNSENT;
11451         chk->snd_count = 0;
11452         chk->whoTo = asoc->primary_destination;
11453         atomic_add_int(&chk->whoTo->ref_count, 1);
11454
11455         ch = mtod(chk->data, struct sctp_chunkhdr *);
11456         ch->chunk_type = SCTP_STREAM_RESET;
11457         ch->chunk_flags = 0;
11458         ch->chunk_length = htons(chk->book_size);
11459         SCTP_BUF_LEN(chk->data) = chk->send_size;
11460
11461         seq = stcb->asoc.str_reset_seq_out;
11462         if (send_out_req) {
11463                 sctp_add_stream_reset_out(chk, number_entries, list,
11464                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11465                 asoc->stream_reset_out_is_outstanding = 1;
11466                 seq++;
11467                 asoc->stream_reset_outstanding++;
11468         }
11469         if (add_stream) {
11470                 sctp_add_a_stream(chk, seq, adding);
11471                 seq++;
11472                 asoc->stream_reset_outstanding++;
11473         }
11474         if (send_in_req) {
11475                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11476                 asoc->stream_reset_outstanding++;
11477         }
11478         if (send_tsn_req) {
11479                 sctp_add_stream_reset_tsn(chk, seq);
11480                 asoc->stream_reset_outstanding++;
11481         }
11482         asoc->str_reset = chk;
11483
11484         /* insert the chunk for sending */
11485         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11486             chk,
11487             sctp_next);
11488         asoc->ctrl_queue_cnt++;
11489         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11490         return (0);
11491 }
11492
11493 void
11494 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11495     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11496 {
11497         /*-
11498          * Formulate the abort message, and send it back down.
11499          */
11500         struct mbuf *o_pak;
11501         struct mbuf *mout;
11502         struct sctp_abort_msg *abm;
11503         struct ip *iph, *iph_out;
11504         struct udphdr *udp;
11505
11506 #ifdef INET6
11507         struct ip6_hdr *ip6, *ip6_out;
11508
11509 #endif
11510         int iphlen_out, len;
11511
11512         /* don't respond to ABORT with ABORT */
11513         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11514                 if (err_cause)
11515                         sctp_m_freem(err_cause);
11516                 return;
11517         }
11518         iph = mtod(m, struct ip *);
11519         switch (iph->ip_v) {
11520         case IPVERSION:
11521                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11522                 break;
11523 #ifdef INET6
11524         case IPV6_VERSION >> 4:
11525                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11526                 break;
11527 #endif
11528         default:
11529                 if (err_cause) {
11530                         sctp_m_freem(err_cause);
11531                 }
11532                 return;
11533         }
11534         if (port) {
11535                 len += sizeof(struct udphdr);
11536         }
11537         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11538         if (mout == NULL) {
11539                 if (err_cause) {
11540                         sctp_m_freem(err_cause);
11541                 }
11542                 return;
11543         }
11544         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11545         SCTP_BUF_LEN(mout) = len;
11546         SCTP_BUF_NEXT(mout) = err_cause;
11547         iph_out = NULL;
11548 #ifdef INET6
11549         ip6_out = NULL;
11550 #endif
11551         switch (iph->ip_v) {
11552         case IPVERSION:
11553                 iph_out = mtod(mout, struct ip *);
11554
11555                 /* Fill in the IP header for the ABORT */
11556                 iph_out->ip_v = IPVERSION;
11557                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11558                 iph_out->ip_tos = (u_char)0;
11559                 iph_out->ip_id = 0;
11560                 iph_out->ip_off = 0;
11561                 iph_out->ip_ttl = MAXTTL;
11562                 if (port) {
11563                         iph_out->ip_p = IPPROTO_UDP;
11564                 } else {
11565                         iph_out->ip_p = IPPROTO_SCTP;
11566                 }
11567                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11568                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11569                 /* let IP layer calculate this */
11570                 iph_out->ip_sum = 0;
11571
11572                 iphlen_out = sizeof(*iph_out);
11573                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11574                 break;
11575 #ifdef INET6
11576         case IPV6_VERSION >> 4:
11577                 ip6 = (struct ip6_hdr *)iph;
11578                 ip6_out = mtod(mout, struct ip6_hdr *);
11579
11580                 /* Fill in the IP6 header for the ABORT */
11581                 ip6_out->ip6_flow = ip6->ip6_flow;
11582                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11583                 if (port) {
11584                         ip6_out->ip6_nxt = IPPROTO_UDP;
11585                 } else {
11586                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11587                 }
11588                 ip6_out->ip6_src = ip6->ip6_dst;
11589                 ip6_out->ip6_dst = ip6->ip6_src;
11590
11591                 iphlen_out = sizeof(*ip6_out);
11592                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11593                 break;
11594 #endif                          /* INET6 */
11595         default:
11596                 /* Currently not supported */
11597                 sctp_m_freem(mout);
11598                 return;
11599         }
11600
11601         udp = (struct udphdr *)abm;
11602         if (port) {
11603                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11604                 udp->uh_dport = port;
11605                 /* set udp->uh_ulen later */
11606                 udp->uh_sum = 0;
11607                 iphlen_out += sizeof(struct udphdr);
11608                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11609         }
11610         abm->sh.src_port = sh->dest_port;
11611         abm->sh.dest_port = sh->src_port;
11612         abm->sh.checksum = 0;
11613         if (vtag == 0) {
11614                 abm->sh.v_tag = sh->v_tag;
11615                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11616         } else {
11617                 abm->sh.v_tag = htonl(vtag);
11618                 abm->msg.ch.chunk_flags = 0;
11619         }
11620         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11621
11622         if (err_cause) {
11623                 struct mbuf *m_tmp = err_cause;
11624                 int err_len = 0;
11625
11626                 /* get length of the err_cause chain */
11627                 while (m_tmp != NULL) {
11628                         err_len += SCTP_BUF_LEN(m_tmp);
11629                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11630                 }
11631                 len = SCTP_BUF_LEN(mout) + err_len;
11632                 if (err_len % 4) {
11633                         /* need pad at end of chunk */
11634                         uint32_t cpthis = 0;
11635                         int padlen;
11636
11637                         padlen = 4 - (len % 4);
11638                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11639                         len += padlen;
11640                 }
11641                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11642         } else {
11643                 len = SCTP_BUF_LEN(mout);
11644                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11645         }
11646
11647         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11648                 /* no mbuf's */
11649                 sctp_m_freem(mout);
11650                 return;
11651         }
11652         if (iph_out != NULL) {
11653                 sctp_route_t ro;
11654                 int ret;
11655
11656                 /* zap the stack pointer to the route */
11657                 bzero(&ro, sizeof ro);
11658                 if (port) {
11659                         udp->uh_ulen = htons(len - sizeof(struct ip));
11660                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11661                 }
11662                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11663                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11664                 /* set IPv4 length */
11665                 iph_out->ip_len = len;
11666                 /* out it goes */
11667 #ifdef  SCTP_PACKET_LOGGING
11668                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11669                         sctp_packet_log(mout, len);
11670 #endif
11671                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11672                 if (port) {
11673 #if defined(SCTP_WITH_NO_CSUM)
11674                         SCTP_STAT_INCR(sctps_sendnocrc);
11675 #else
11676                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11677                         SCTP_STAT_INCR(sctps_sendswcrc);
11678 #endif
11679                         SCTP_ENABLE_UDP_CSUM(o_pak);
11680                 } else {
11681 #if defined(SCTP_WITH_NO_CSUM)
11682                         SCTP_STAT_INCR(sctps_sendnocrc);
11683 #else
11684                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11685                         mout->m_pkthdr.csum_data = 0;
11686                         SCTP_STAT_INCR(sctps_sendhwcrc);
11687 #endif
11688                 }
11689                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11690
11691                 /* Free the route if we got one back */
11692                 if (ro.ro_rt)
11693                         RTFREE(ro.ro_rt);
11694         }
11695 #ifdef INET6
11696         if (ip6_out != NULL) {
11697                 struct route_in6 ro;
11698                 int ret;
11699                 struct ifnet *ifp = NULL;
11700
11701                 /* zap the stack pointer to the route */
11702                 bzero(&ro, sizeof(ro));
11703                 if (port) {
11704                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11705                 }
11706                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11707                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11708                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11709 #ifdef  SCTP_PACKET_LOGGING
11710                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11711                         sctp_packet_log(mout, len);
11712 #endif
11713                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11714                 if (port) {
11715 #if defined(SCTP_WITH_NO_CSUM)
11716                         SCTP_STAT_INCR(sctps_sendnocrc);
11717 #else
11718                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11719                         SCTP_STAT_INCR(sctps_sendswcrc);
11720 #endif
11721                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11722                                 udp->uh_sum = 0xffff;
11723                         }
11724                 } else {
11725 #if defined(SCTP_WITH_NO_CSUM)
11726                         SCTP_STAT_INCR(sctps_sendnocrc);
11727 #else
11728                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11729                         mout->m_pkthdr.csum_data = 0;
11730                         SCTP_STAT_INCR(sctps_sendhwcrc);
11731 #endif
11732                 }
11733                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11734
11735                 /* Free the route if we got one back */
11736                 if (ro.ro_rt)
11737                         RTFREE(ro.ro_rt);
11738         }
11739 #endif
11740         SCTP_STAT_INCR(sctps_sendpackets);
11741         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11742         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11743 }
11744
11745 void
11746 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11747     uint32_t vrf_id, uint16_t port)
11748 {
11749         struct mbuf *o_pak;
11750         struct sctphdr *sh, *sh_out;
11751         struct sctp_chunkhdr *ch;
11752         struct ip *iph, *iph_out;
11753         struct udphdr *udp = NULL;
11754         struct mbuf *mout;
11755
11756 #ifdef INET6
11757         struct ip6_hdr *ip6, *ip6_out;
11758
11759 #endif
11760         int iphlen_out, len;
11761
11762         iph = mtod(m, struct ip *);
11763         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11764         switch (iph->ip_v) {
11765         case IPVERSION:
11766                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11767                 break;
11768 #ifdef INET6
11769         case IPV6_VERSION >> 4:
11770                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11771                 break;
11772 #endif
11773         default:
11774                 if (scm) {
11775                         sctp_m_freem(scm);
11776                 }
11777                 return;
11778         }
11779         if (port) {
11780                 len += sizeof(struct udphdr);
11781         }
11782         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11783         if (mout == NULL) {
11784                 if (scm) {
11785                         sctp_m_freem(scm);
11786                 }
11787                 return;
11788         }
11789         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11790         SCTP_BUF_LEN(mout) = len;
11791         SCTP_BUF_NEXT(mout) = scm;
11792         iph_out = NULL;
11793 #ifdef INET6
11794         ip6_out = NULL;
11795 #endif
11796         switch (iph->ip_v) {
11797         case IPVERSION:
11798                 iph_out = mtod(mout, struct ip *);
11799
11800                 /* Fill in the IP header for the ABORT */
11801                 iph_out->ip_v = IPVERSION;
11802                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11803                 iph_out->ip_tos = (u_char)0;
11804                 iph_out->ip_id = 0;
11805                 iph_out->ip_off = 0;
11806                 iph_out->ip_ttl = MAXTTL;
11807                 if (port) {
11808                         iph_out->ip_p = IPPROTO_UDP;
11809                 } else {
11810                         iph_out->ip_p = IPPROTO_SCTP;
11811                 }
11812                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11813                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11814                 /* let IP layer calculate this */
11815                 iph_out->ip_sum = 0;
11816
11817                 iphlen_out = sizeof(struct ip);
11818                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11819                 break;
11820 #ifdef INET6
11821         case IPV6_VERSION >> 4:
11822                 ip6 = (struct ip6_hdr *)iph;
11823                 ip6_out = mtod(mout, struct ip6_hdr *);
11824
11825                 /* Fill in the IP6 header for the ABORT */
11826                 ip6_out->ip6_flow = ip6->ip6_flow;
11827                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11828                 if (port) {
11829                         ip6_out->ip6_nxt = IPPROTO_UDP;
11830                 } else {
11831                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11832                 }
11833                 ip6_out->ip6_src = ip6->ip6_dst;
11834                 ip6_out->ip6_dst = ip6->ip6_src;
11835
11836                 iphlen_out = sizeof(struct ip6_hdr);
11837                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11838                 break;
11839 #endif                          /* INET6 */
11840         default:
11841                 /* Currently not supported */
11842                 sctp_m_freem(mout);
11843                 return;
11844         }
11845
11846         udp = (struct udphdr *)sh_out;
11847         if (port) {
11848                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11849                 udp->uh_dport = port;
11850                 /* set udp->uh_ulen later */
11851                 udp->uh_sum = 0;
11852                 iphlen_out += sizeof(struct udphdr);
11853                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11854         }
11855         sh_out->src_port = sh->dest_port;
11856         sh_out->dest_port = sh->src_port;
11857         sh_out->v_tag = vtag;
11858         sh_out->checksum = 0;
11859
11860         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11861         ch->chunk_type = SCTP_OPERATION_ERROR;
11862         ch->chunk_flags = 0;
11863
11864         if (scm) {
11865                 struct mbuf *m_tmp = scm;
11866                 int cause_len = 0;
11867
11868                 /* get length of the err_cause chain */
11869                 while (m_tmp != NULL) {
11870                         cause_len += SCTP_BUF_LEN(m_tmp);
11871                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11872                 }
11873                 len = SCTP_BUF_LEN(mout) + cause_len;
11874                 if (cause_len % 4) {
11875                         /* need pad at end of chunk */
11876                         uint32_t cpthis = 0;
11877                         int padlen;
11878
11879                         padlen = 4 - (len % 4);
11880                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11881                         len += padlen;
11882                 }
11883                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11884         } else {
11885                 len = SCTP_BUF_LEN(mout);
11886                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11887         }
11888
11889         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11890                 /* no mbuf's */
11891                 sctp_m_freem(mout);
11892                 return;
11893         }
11894         if (iph_out != NULL) {
11895                 sctp_route_t ro;
11896                 int ret;
11897
11898                 /* zap the stack pointer to the route */
11899                 bzero(&ro, sizeof ro);
11900                 if (port) {
11901                         udp->uh_ulen = htons(len - sizeof(struct ip));
11902                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11903                 }
11904                 /* set IPv4 length */
11905                 iph_out->ip_len = len;
11906                 /* out it goes */
11907 #ifdef  SCTP_PACKET_LOGGING
11908                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11909                         sctp_packet_log(mout, len);
11910 #endif
11911                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11912                 if (port) {
11913 #if defined(SCTP_WITH_NO_CSUM)
11914                         SCTP_STAT_INCR(sctps_sendnocrc);
11915 #else
11916                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11917                         SCTP_STAT_INCR(sctps_sendswcrc);
11918 #endif
11919                         SCTP_ENABLE_UDP_CSUM(o_pak);
11920                 } else {
11921 #if defined(SCTP_WITH_NO_CSUM)
11922                         SCTP_STAT_INCR(sctps_sendnocrc);
11923 #else
11924                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11925                         mout->m_pkthdr.csum_data = 0;
11926                         SCTP_STAT_INCR(sctps_sendhwcrc);
11927 #endif
11928                 }
11929                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11930
11931                 /* Free the route if we got one back */
11932                 if (ro.ro_rt)
11933                         RTFREE(ro.ro_rt);
11934         }
11935 #ifdef INET6
11936         if (ip6_out != NULL) {
11937                 struct route_in6 ro;
11938                 int ret;
11939                 struct ifnet *ifp = NULL;
11940
11941                 /* zap the stack pointer to the route */
11942                 bzero(&ro, sizeof(ro));
11943                 if (port) {
11944                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11945                 }
11946                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11947 #ifdef  SCTP_PACKET_LOGGING
11948                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11949                         sctp_packet_log(mout, len);
11950 #endif
11951                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11952                 if (port) {
11953 #if defined(SCTP_WITH_NO_CSUM)
11954                         SCTP_STAT_INCR(sctps_sendnocrc);
11955 #else
11956                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11957                         SCTP_STAT_INCR(sctps_sendswcrc);
11958 #endif
11959                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11960                                 udp->uh_sum = 0xffff;
11961                         }
11962                 } else {
11963 #if defined(SCTP_WITH_NO_CSUM)
11964                         SCTP_STAT_INCR(sctps_sendnocrc);
11965 #else
11966                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11967                         mout->m_pkthdr.csum_data = 0;
11968                         SCTP_STAT_INCR(sctps_sendhwcrc);
11969 #endif
11970                 }
11971                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11972
11973                 /* Free the route if we got one back */
11974                 if (ro.ro_rt)
11975                         RTFREE(ro.ro_rt);
11976         }
11977 #endif
11978         SCTP_STAT_INCR(sctps_sendpackets);
11979         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11980         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11981 }
11982
11983 static struct mbuf *
11984 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11985     struct uio *uio,
11986     struct sctp_sndrcvinfo *srcv,
11987     int max_send_len,
11988     int user_marks_eor,
11989     int *error,
11990     uint32_t * sndout,
11991     struct mbuf **new_tail)
11992 {
11993         struct mbuf *m;
11994
11995         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11996             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11997         if (m == NULL) {
11998                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11999                 *error = ENOMEM;
12000         } else {
12001                 *sndout = m_length(m, NULL);
12002                 *new_tail = m_last(m);
12003         }
12004         return (m);
12005 }
12006
12007 static int
12008 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12009     struct uio *uio,
12010     int resv_upfront)
12011 {
12012         int left;
12013
12014         left = sp->length;
12015         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12016             resv_upfront, 0);
12017         if (sp->data == NULL) {
12018                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12019                 return (ENOMEM);
12020         }
12021         sp->tail_mbuf = m_last(sp->data);
12022         return (0);
12023 }
12024
12025
12026
12027 static struct sctp_stream_queue_pending *
12028 sctp_copy_it_in(struct sctp_tcb *stcb,
12029     struct sctp_association *asoc,
12030     struct sctp_sndrcvinfo *srcv,
12031     struct uio *uio,
12032     struct sctp_nets *net,
12033     int max_send_len,
12034     int user_marks_eor,
12035     int *error,
12036     int non_blocking)
12037 {
12038         /*-
12039          * This routine must be very careful in its work. Protocol
12040          * processing is up and running so care must be taken to spl...()
12041          * when you need to do something that may effect the stcb/asoc. The
12042          * sb is locked however. When data is copied the protocol processing
12043          * should be enabled since this is a slower operation...
12044          */
12045         struct sctp_stream_queue_pending *sp = NULL;
12046         int resv_in_first;
12047
12048         *error = 0;
12049         /* Now can we send this? */
12050         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12051             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12052             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12053             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12054                 /* got data while shutting down */
12055                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12056                 *error = ECONNRESET;
12057                 goto out_now;
12058         }
12059         sctp_alloc_a_strmoq(stcb, sp);
12060         if (sp == NULL) {
12061                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12062                 *error = ENOMEM;
12063                 goto out_now;
12064         }
12065         sp->act_flags = 0;
12066         sp->sender_all_done = 0;
12067         sp->sinfo_flags = srcv->sinfo_flags;
12068         sp->timetolive = srcv->sinfo_timetolive;
12069         sp->ppid = srcv->sinfo_ppid;
12070         sp->context = srcv->sinfo_context;
12071         sp->strseq = 0;
12072         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12073
12074         sp->stream = srcv->sinfo_stream;
12075         sp->length = min(uio->uio_resid, max_send_len);
12076         if ((sp->length == (uint32_t) uio->uio_resid) &&
12077             ((user_marks_eor == 0) ||
12078             (srcv->sinfo_flags & SCTP_EOF) ||
12079             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12080                 sp->msg_is_complete = 1;
12081         } else {
12082                 sp->msg_is_complete = 0;
12083         }
12084         sp->sender_all_done = 0;
12085         sp->some_taken = 0;
12086         sp->put_last_out = 0;
12087         resv_in_first = sizeof(struct sctp_data_chunk);
12088         sp->data = sp->tail_mbuf = NULL;
12089         if (sp->length == 0) {
12090                 *error = 0;
12091                 goto skip_copy;
12092         }
12093         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12094         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12095                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12096                 sp->holds_key_ref = 1;
12097         }
12098         *error = sctp_copy_one(sp, uio, resv_in_first);
12099 skip_copy:
12100         if (*error) {
12101                 sctp_free_a_strmoq(stcb, sp);
12102                 sp = NULL;
12103         } else {
12104                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12105                         sp->net = net;
12106                 } else {
12107                         sp->net = asoc->primary_destination;
12108                 }
12109                 atomic_add_int(&sp->net->ref_count, 1);
12110                 sctp_set_prsctp_policy(sp);
12111         }
12112 out_now:
12113         return (sp);
12114 }
12115
12116
12117 int
12118 sctp_sosend(struct socket *so,
12119     struct sockaddr *addr,
12120     struct uio *uio,
12121     struct mbuf *top,
12122     struct mbuf *control,
12123     int flags,
12124     struct thread *p
12125 )
12126 {
12127         struct sctp_inpcb *inp;
12128         int error, use_rcvinfo = 0;
12129         struct sctp_sndrcvinfo srcv;
12130         struct sockaddr *addr_to_use;
12131
12132 #if defined(INET) && defined(INET6)
12133         struct sockaddr_in sin;
12134
12135 #endif
12136
12137         inp = (struct sctp_inpcb *)so->so_pcb;
12138         if (control) {
12139                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12140                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12141                     sizeof(srcv))) {
12142                         /* got one */
12143                         use_rcvinfo = 1;
12144                 }
12145         }
12146         addr_to_use = addr;
12147 #if defined(INET) && defined(INET6)
12148         if ((addr) && (addr->sa_family == AF_INET6)) {
12149                 struct sockaddr_in6 *sin6;
12150
12151                 sin6 = (struct sockaddr_in6 *)addr;
12152                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12153                         in6_sin6_2_sin(&sin, sin6);
12154                         addr_to_use = (struct sockaddr *)&sin;
12155                 }
12156         }
12157 #endif
12158         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12159             control,
12160             flags,
12161             use_rcvinfo ? &srcv : NULL
12162             ,p
12163             );
12164         return (error);
12165 }
12166
12167
12168 int
12169 sctp_lower_sosend(struct socket *so,
12170     struct sockaddr *addr,
12171     struct uio *uio,
12172     struct mbuf *i_pak,
12173     struct mbuf *control,
12174     int flags,
12175     struct sctp_sndrcvinfo *srcv
12176     ,
12177     struct thread *p
12178 )
12179 {
12180         unsigned int sndlen = 0, max_len;
12181         int error, len;
12182         struct mbuf *top = NULL;
12183         int queue_only = 0, queue_only_for_init = 0;
12184         int free_cnt_applied = 0;
12185         int un_sent = 0;
12186         int now_filled = 0;
12187         unsigned int inqueue_bytes = 0;
12188         struct sctp_block_entry be;
12189         struct sctp_inpcb *inp;
12190         struct sctp_tcb *stcb = NULL;
12191         struct timeval now;
12192         struct sctp_nets *net;
12193         struct sctp_association *asoc;
12194         struct sctp_inpcb *t_inp;
12195         int user_marks_eor;
12196         int create_lock_applied = 0;
12197         int nagle_applies = 0;
12198         int some_on_control = 0;
12199         int got_all_of_the_send = 0;
12200         int hold_tcblock = 0;
12201         int non_blocking = 0;
12202         uint32_t local_add_more, local_soresv = 0;
12203         uint16_t port;
12204         uint16_t sinfo_flags;
12205         sctp_assoc_t sinfo_assoc_id;
12206
12207         error = 0;
12208         net = NULL;
12209         stcb = NULL;
12210         asoc = NULL;
12211
12212         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12213         if (inp == NULL) {
12214                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12215                 error = EINVAL;
12216                 if (i_pak) {
12217                         SCTP_RELEASE_PKT(i_pak);
12218                 }
12219                 return (error);
12220         }
12221         if ((uio == NULL) && (i_pak == NULL)) {
12222                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12223                 return (EINVAL);
12224         }
12225         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12226         atomic_add_int(&inp->total_sends, 1);
12227         if (uio) {
12228                 if (uio->uio_resid < 0) {
12229                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12230                         return (EINVAL);
12231                 }
12232                 sndlen = uio->uio_resid;
12233         } else {
12234                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12235                 sndlen = SCTP_HEADER_LEN(i_pak);
12236         }
12237         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12238             addr,
12239             sndlen);
12240         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12241             (inp->sctp_socket->so_qlimit)) {
12242                 /* The listener can NOT send */
12243                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12244                 error = ENOTCONN;
12245                 goto out_unlocked;
12246         }
12247         /**
12248          * Pre-screen address, if one is given the sin-len
12249          * must be set correctly!
12250          */
12251         if (addr) {
12252                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12253
12254                 switch (raddr->sa.sa_family) {
12255 #if defined(INET)
12256                 case AF_INET:
12257                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12258                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12259                                 error = EINVAL;
12260                                 goto out_unlocked;
12261                         }
12262                         port = raddr->sin.sin_port;
12263                         break;
12264 #endif
12265 #if defined(INET6)
12266                 case AF_INET6:
12267                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12268                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12269                                 error = EINVAL;
12270                                 goto out_unlocked;
12271                         }
12272                         port = raddr->sin6.sin6_port;
12273                         break;
12274 #endif
12275                 default:
12276                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12277                         error = EAFNOSUPPORT;
12278                         goto out_unlocked;
12279                 }
12280         } else
12281                 port = 0;
12282
12283         if (srcv) {
12284                 sinfo_flags = srcv->sinfo_flags;
12285                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12286                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12287                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12288                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12289                         error = EINVAL;
12290                         goto out_unlocked;
12291                 }
12292                 if (srcv->sinfo_flags)
12293                         SCTP_STAT_INCR(sctps_sends_with_flags);
12294         } else {
12295                 sinfo_flags = inp->def_send.sinfo_flags;
12296                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12297         }
12298         if (sinfo_flags & SCTP_SENDALL) {
12299                 /* its a sendall */
12300                 error = sctp_sendall(inp, uio, top, srcv);
12301                 top = NULL;
12302                 goto out_unlocked;
12303         }
12304         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12305                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12306                 error = EINVAL;
12307                 goto out_unlocked;
12308         }
12309         /* now we must find the assoc */
12310         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12311             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12312                 SCTP_INP_RLOCK(inp);
12313                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12314                 if (stcb == NULL) {
12315                         SCTP_INP_RUNLOCK(inp);
12316                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12317                         error = ENOTCONN;
12318                         goto out_unlocked;
12319                 }
12320                 SCTP_TCB_LOCK(stcb);
12321                 hold_tcblock = 1;
12322                 SCTP_INP_RUNLOCK(inp);
12323         } else if (sinfo_assoc_id) {
12324                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12325         } else if (addr) {
12326                 /*-
12327                  * Since we did not use findep we must
12328                  * increment it, and if we don't find a tcb
12329                  * decrement it.
12330                  */
12331                 SCTP_INP_WLOCK(inp);
12332                 SCTP_INP_INCR_REF(inp);
12333                 SCTP_INP_WUNLOCK(inp);
12334                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12335                 if (stcb == NULL) {
12336                         SCTP_INP_WLOCK(inp);
12337                         SCTP_INP_DECR_REF(inp);
12338                         SCTP_INP_WUNLOCK(inp);
12339                 } else {
12340                         hold_tcblock = 1;
12341                 }
12342         }
12343         if ((stcb == NULL) && (addr)) {
12344                 /* Possible implicit send? */
12345                 SCTP_ASOC_CREATE_LOCK(inp);
12346                 create_lock_applied = 1;
12347                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12348                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12349                         /* Should I really unlock ? */
12350                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12351                         error = EINVAL;
12352                         goto out_unlocked;
12353
12354                 }
12355                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12356                     (addr->sa_family == AF_INET6)) {
12357                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12358                         error = EINVAL;
12359                         goto out_unlocked;
12360                 }
12361                 SCTP_INP_WLOCK(inp);
12362                 SCTP_INP_INCR_REF(inp);
12363                 SCTP_INP_WUNLOCK(inp);
12364                 /* With the lock applied look again */
12365                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12366                 if (stcb == NULL) {
12367                         SCTP_INP_WLOCK(inp);
12368                         SCTP_INP_DECR_REF(inp);
12369                         SCTP_INP_WUNLOCK(inp);
12370                 } else {
12371                         hold_tcblock = 1;
12372                 }
12373                 if (t_inp != inp) {
12374                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12375                         error = ENOTCONN;
12376                         goto out_unlocked;
12377                 }
12378         }
12379         if (stcb == NULL) {
12380                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12381                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12382                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12383                         error = ENOTCONN;
12384                         goto out_unlocked;
12385                 }
12386                 if (addr == NULL) {
12387                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12388                         error = ENOENT;
12389                         goto out_unlocked;
12390                 } else {
12391                         /*
12392                          * UDP style, we must go ahead and start the INIT
12393                          * process
12394                          */
12395                         uint32_t vrf_id;
12396
12397                         if ((sinfo_flags & SCTP_ABORT) ||
12398                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12399                                 /*-
12400                                  * User asks to abort a non-existant assoc,
12401                                  * or EOF a non-existant assoc with no data
12402                                  */
12403                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12404                                 error = ENOENT;
12405                                 goto out_unlocked;
12406                         }
12407                         /* get an asoc/stcb struct */
12408                         vrf_id = inp->def_vrf_id;
12409 #ifdef INVARIANTS
12410                         if (create_lock_applied == 0) {
12411                                 panic("Error, should hold create lock and I don't?");
12412                         }
12413 #endif
12414                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12415                             p
12416                             );
12417                         if (stcb == NULL) {
12418                                 /* Error is setup for us in the call */
12419                                 goto out_unlocked;
12420                         }
12421                         if (create_lock_applied) {
12422                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12423                                 create_lock_applied = 0;
12424                         } else {
12425                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12426                         }
12427                         /*
12428                          * Turn on queue only flag to prevent data from
12429                          * being sent
12430                          */
12431                         queue_only = 1;
12432                         asoc = &stcb->asoc;
12433                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12434                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12435
12436                         /* initialize authentication params for the assoc */
12437                         sctp_initialize_auth_params(inp, stcb);
12438
12439                         if (control) {
12440                                 /*
12441                                  * see if a init structure exists in cmsg
12442                                  * headers
12443                                  */
12444                                 struct sctp_initmsg initm;
12445                                 int i;
12446
12447                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12448                                     sizeof(initm))) {
12449                                         /*
12450                                          * we have an INIT override of the
12451                                          * default
12452                                          */
12453                                         if (initm.sinit_max_attempts)
12454                                                 asoc->max_init_times = initm.sinit_max_attempts;
12455                                         if (initm.sinit_num_ostreams)
12456                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12457                                         if (initm.sinit_max_instreams)
12458                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12459                                         if (initm.sinit_max_init_timeo)
12460                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12461                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12462                                                 struct sctp_stream_out *tmp_str;
12463                                                 int had_lock = 0;
12464
12465                                                 /* Default is NOT correct */
12466                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12467                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12468                                                 /*
12469                                                  * What happens if this
12470                                                  * fails? we panic ...
12471                                                  */
12472
12473                                                 if (hold_tcblock) {
12474                                                         had_lock = 1;
12475                                                         SCTP_TCB_UNLOCK(stcb);
12476                                                 }
12477                                                 SCTP_MALLOC(tmp_str,
12478                                                     struct sctp_stream_out *,
12479                                                     (asoc->pre_open_streams *
12480                                                     sizeof(struct sctp_stream_out)),
12481                                                     SCTP_M_STRMO);
12482                                                 if (had_lock) {
12483                                                         SCTP_TCB_LOCK(stcb);
12484                                                 }
12485                                                 if (tmp_str != NULL) {
12486                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12487                                                         asoc->strmout = tmp_str;
12488                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12489                                                 } else {
12490                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12491                                                 }
12492                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12493                                                         /*-
12494                                                          * inbound side must be set
12495                                                          * to 0xffff, also NOTE when
12496                                                          * we get the INIT-ACK back
12497                                                          * (for INIT sender) we MUST
12498                                                          * reduce the count
12499                                                          * (streamoutcnt) but first
12500                                                          * check if we sent to any
12501                                                          * of the upper streams that
12502                                                          * were dropped (if some
12503                                                          * were). Those that were
12504                                                          * dropped must be notified
12505                                                          * to the upper layer as
12506                                                          * failed to send.
12507                                                          */
12508                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12509                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12510                                                         asoc->strmout[i].stream_no = i;
12511                                                         asoc->strmout[i].last_msg_incomplete = 0;
12512                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12513                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12514                                                 }
12515                                         }
12516                                 }
12517                         }
12518                         hold_tcblock = 1;
12519                         /* out with the INIT */
12520                         queue_only_for_init = 1;
12521                         /*-
12522                          * we may want to dig in after this call and adjust the MTU
12523                          * value. It defaulted to 1500 (constant) but the ro
12524                          * structure may now have an update and thus we may need to
12525                          * change it BEFORE we append the message.
12526                          */
12527                 }
12528         }
12529         if (srcv == NULL)
12530                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12531         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12532                 if (addr)
12533                         net = sctp_findnet(stcb, addr);
12534                 else
12535                         net = NULL;
12536                 if ((net == NULL) ||
12537                     ((port != 0) && (port != stcb->rport))) {
12538                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12539                         error = EINVAL;
12540                         goto out_unlocked;
12541                 }
12542         } else {
12543                 net = stcb->asoc.primary_destination;
12544         }
12545
12546         if ((SCTP_SO_IS_NBIO(so)
12547             || (flags & MSG_NBIO)
12548             )) {
12549                 non_blocking = 1;
12550         }
12551         asoc = &stcb->asoc;
12552         atomic_add_int(&stcb->total_sends, 1);
12553
12554         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12555                 if (sndlen > asoc->smallest_mtu) {
12556                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12557                         error = EMSGSIZE;
12558                         goto out_unlocked;
12559                 }
12560         }
12561         /* would we block? */
12562         if (non_blocking) {
12563                 if (hold_tcblock == 0) {
12564                         SCTP_TCB_LOCK(stcb);
12565                         hold_tcblock = 1;
12566                 }
12567                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12568                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12569                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12570                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12571                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12572                                 error = EMSGSIZE;
12573                         else
12574                                 error = EWOULDBLOCK;
12575                         goto out_unlocked;
12576                 }
12577                 stcb->asoc.sb_send_resv += sndlen;
12578                 SCTP_TCB_UNLOCK(stcb);
12579                 hold_tcblock = 0;
12580         } else {
12581                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12582         }
12583         local_soresv = sndlen;
12584         /* Keep the stcb from being freed under our feet */
12585         if (free_cnt_applied) {
12586 #ifdef INVARIANTS
12587                 panic("refcnt already incremented");
12588 #else
12589                 printf("refcnt:1 already incremented?\n");
12590 #endif
12591         } else {
12592                 atomic_add_int(&stcb->asoc.refcnt, 1);
12593                 free_cnt_applied = 1;
12594         }
12595         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12596                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12597                 error = ECONNRESET;
12598                 goto out_unlocked;
12599         }
12600         if (create_lock_applied) {
12601                 SCTP_ASOC_CREATE_UNLOCK(inp);
12602                 create_lock_applied = 0;
12603         }
12604         if (asoc->stream_reset_outstanding) {
12605                 /*
12606                  * Can't queue any data while stream reset is underway.
12607                  */
12608                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12609                 error = EAGAIN;
12610                 goto out_unlocked;
12611         }
12612         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12613             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12614                 queue_only = 1;
12615         }
12616         /* we are now done with all control */
12617         if (control) {
12618                 sctp_m_freem(control);
12619                 control = NULL;
12620         }
12621         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12622             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12623             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12624             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12625                 if (srcv->sinfo_flags & SCTP_ABORT) {
12626                         ;
12627                 } else {
12628                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12629                         error = ECONNRESET;
12630                         goto out_unlocked;
12631                 }
12632         }
12633         /* Ok, we will attempt a msgsnd :> */
12634         if (p) {
12635                 p->td_ru.ru_msgsnd++;
12636         }
12637         if ((net->flight_size > net->cwnd) &&
12638             (asoc->sctp_cmt_on_off == 0)) {
12639                 /*-
12640                  * CMT: Added check for CMT above. net above is the primary
12641                  * dest. If CMT is ON, sender should always attempt to send
12642                  * with the output routine sctp_fill_outqueue() that loops
12643                  * through all destination addresses. Therefore, if CMT is
12644                  * ON, queue_only is NOT set to 1 here, so that
12645                  * sctp_chunk_output() can be called below.
12646                  */
12647                 queue_only = 1;
12648         } else if (asoc->ifp_had_enobuf) {
12649                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12650                 if (net->flight_size > (net->mtu * 2))
12651                         queue_only = 1;
12652                 asoc->ifp_had_enobuf = 0;
12653         } else {
12654                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12655                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12656         }
12657         /* Are we aborting? */
12658         if (srcv->sinfo_flags & SCTP_ABORT) {
12659                 struct mbuf *mm;
12660                 int tot_demand, tot_out = 0, max_out;
12661
12662                 SCTP_STAT_INCR(sctps_sends_with_abort);
12663                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12664                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12665                         /* It has to be up before we abort */
12666                         /* how big is the user initiated abort? */
12667                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12668                         error = EINVAL;
12669                         goto out;
12670                 }
12671                 if (hold_tcblock) {
12672                         SCTP_TCB_UNLOCK(stcb);
12673                         hold_tcblock = 0;
12674                 }
12675                 if (top) {
12676                         struct mbuf *cntm = NULL;
12677
12678                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12679                         if (sndlen != 0) {
12680                                 cntm = top;
12681                                 while (cntm) {
12682                                         tot_out += SCTP_BUF_LEN(cntm);
12683                                         cntm = SCTP_BUF_NEXT(cntm);
12684                                 }
12685                         }
12686                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12687                 } else {
12688                         /* Must fit in a MTU */
12689                         tot_out = sndlen;
12690                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12691                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12692                                 /* To big */
12693                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12694                                 error = EMSGSIZE;
12695                                 goto out;
12696                         }
12697                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12698                 }
12699                 if (mm == NULL) {
12700                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12701                         error = ENOMEM;
12702                         goto out;
12703                 }
12704                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12705                 max_out -= sizeof(struct sctp_abort_msg);
12706                 if (tot_out > max_out) {
12707                         tot_out = max_out;
12708                 }
12709                 if (mm) {
12710                         struct sctp_paramhdr *ph;
12711
12712                         /* now move forward the data pointer */
12713                         ph = mtod(mm, struct sctp_paramhdr *);
12714                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12715                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12716                         ph++;
12717                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12718                         if (top == NULL) {
12719                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12720                                 if (error) {
12721                                         /*-
12722                                          * Here if we can't get his data we
12723                                          * still abort we just don't get to
12724                                          * send the users note :-0
12725                                          */
12726                                         sctp_m_freem(mm);
12727                                         mm = NULL;
12728                                 }
12729                         } else {
12730                                 if (sndlen != 0) {
12731                                         SCTP_BUF_NEXT(mm) = top;
12732                                 }
12733                         }
12734                 }
12735                 if (hold_tcblock == 0) {
12736                         SCTP_TCB_LOCK(stcb);
12737                         hold_tcblock = 1;
12738                 }
12739                 atomic_add_int(&stcb->asoc.refcnt, -1);
12740                 free_cnt_applied = 0;
12741                 /* release this lock, otherwise we hang on ourselves */
12742                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12743                     SCTP_RESPONSE_TO_USER_REQ,
12744                     mm, SCTP_SO_LOCKED);
12745                 /* now relock the stcb so everything is sane */
12746                 hold_tcblock = 0;
12747                 stcb = NULL;
12748                 /*
12749                  * In this case top is already chained to mm avoid double
12750                  * free, since we free it below if top != NULL and driver
12751                  * would free it after sending the packet out
12752                  */
12753                 if (sndlen != 0) {
12754                         top = NULL;
12755                 }
12756                 goto out_unlocked;
12757         }
12758         /* Calculate the maximum we can send */
12759         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12760         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12761                 if (non_blocking) {
12762                         /* we already checked for non-blocking above. */
12763                         max_len = sndlen;
12764                 } else {
12765                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12766                 }
12767         } else {
12768                 max_len = 0;
12769         }
12770         if (hold_tcblock) {
12771                 SCTP_TCB_UNLOCK(stcb);
12772                 hold_tcblock = 0;
12773         }
12774         /* Is the stream no. valid? */
12775         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12776                 /* Invalid stream number */
12777                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12778                 error = EINVAL;
12779                 goto out_unlocked;
12780         }
12781         if (asoc->strmout == NULL) {
12782                 /* huh? software error */
12783                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12784                 error = EFAULT;
12785                 goto out_unlocked;
12786         }
12787         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12788         if ((user_marks_eor == 0) &&
12789             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12790                 /* It will NEVER fit */
12791                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12792                 error = EMSGSIZE;
12793                 goto out_unlocked;
12794         }
12795         if ((uio == NULL) && user_marks_eor) {
12796                 /*-
12797                  * We do not support eeor mode for
12798                  * sending with mbuf chains (like sendfile).
12799                  */
12800                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12801                 error = EINVAL;
12802                 goto out_unlocked;
12803         }
12804         if (user_marks_eor) {
12805                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12806         } else {
12807                 /*-
12808                  * For non-eeor the whole message must fit in
12809                  * the socket send buffer.
12810                  */
12811                 local_add_more = sndlen;
12812         }
12813         len = 0;
12814         if (non_blocking) {
12815                 goto skip_preblock;
12816         }
12817         if (((max_len <= local_add_more) &&
12818             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12819             (max_len == 0) ||
12820             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12821                 /* No room right now ! */
12822                 SOCKBUF_LOCK(&so->so_snd);
12823                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12824                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12825                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12826                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12827                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12828                             inqueue_bytes,
12829                             local_add_more,
12830                             stcb->asoc.stream_queue_cnt,
12831                             stcb->asoc.chunks_on_out_queue,
12832                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12833                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12834                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12835                         }
12836                         be.error = 0;
12837                         stcb->block_entry = &be;
12838                         error = sbwait(&so->so_snd);
12839                         stcb->block_entry = NULL;
12840                         if (error || so->so_error || be.error) {
12841                                 if (error == 0) {
12842                                         if (so->so_error)
12843                                                 error = so->so_error;
12844                                         if (be.error) {
12845                                                 error = be.error;
12846                                         }
12847                                 }
12848                                 SOCKBUF_UNLOCK(&so->so_snd);
12849                                 goto out_unlocked;
12850                         }
12851                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12852                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12853                                     so, asoc, stcb->asoc.total_output_queue_size);
12854                         }
12855                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12856                                 goto out_unlocked;
12857                         }
12858                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12859                 }
12860                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12861                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12862                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12863                 } else {
12864                         max_len = 0;
12865                 }
12866                 SOCKBUF_UNLOCK(&so->so_snd);
12867         }
12868 skip_preblock:
12869         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12870                 goto out_unlocked;
12871         }
12872         /*
12873          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12874          * case NOTE: uio will be null when top/mbuf is passed
12875          */
12876         if (sndlen == 0) {
12877                 if (srcv->sinfo_flags & SCTP_EOF) {
12878                         got_all_of_the_send = 1;
12879                         goto dataless_eof;
12880                 } else {
12881                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12882                         error = EINVAL;
12883                         goto out;
12884                 }
12885         }
12886         if (top == NULL) {
12887                 struct sctp_stream_queue_pending *sp;
12888                 struct sctp_stream_out *strm;
12889                 uint32_t sndout, initial_out;
12890
12891                 initial_out = uio->uio_resid;
12892
12893                 SCTP_TCB_SEND_LOCK(stcb);
12894                 if ((asoc->stream_locked) &&
12895                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12896                         SCTP_TCB_SEND_UNLOCK(stcb);
12897                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12898                         error = EINVAL;
12899                         goto out;
12900                 }
12901                 SCTP_TCB_SEND_UNLOCK(stcb);
12902
12903                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12904                 if (strm->last_msg_incomplete == 0) {
12905         do_a_copy_in:
12906                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12907                         if ((sp == NULL) || (error)) {
12908                                 goto out;
12909                         }
12910                         SCTP_TCB_SEND_LOCK(stcb);
12911                         if (sp->msg_is_complete) {
12912                                 strm->last_msg_incomplete = 0;
12913                                 asoc->stream_locked = 0;
12914                         } else {
12915                                 /*
12916                                  * Just got locked to this guy in case of an
12917                                  * interrupt.
12918                                  */
12919                                 strm->last_msg_incomplete = 1;
12920                                 asoc->stream_locked = 1;
12921                                 asoc->stream_locked_on = srcv->sinfo_stream;
12922                                 sp->sender_all_done = 0;
12923                         }
12924                         sctp_snd_sb_alloc(stcb, sp->length);
12925                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12926                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12927                                 sp->strseq = strm->next_sequence_sent;
12928                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12929                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12930                                             (uintptr_t) stcb, sp->length,
12931                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12932                                 }
12933                                 strm->next_sequence_sent++;
12934                         } else {
12935                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12936                         }
12937                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12938                         if ((strm->next_spoke.tqe_next == NULL) &&
12939                             (strm->next_spoke.tqe_prev == NULL)) {
12940                                 /* Not on wheel, insert */
12941                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12942                         }
12943                         SCTP_TCB_SEND_UNLOCK(stcb);
12944                 } else {
12945                         SCTP_TCB_SEND_LOCK(stcb);
12946                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12947                         SCTP_TCB_SEND_UNLOCK(stcb);
12948                         if (sp == NULL) {
12949                                 /* ???? Huh ??? last msg is gone */
12950 #ifdef INVARIANTS
12951                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12952 #else
12953                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12954                                 strm->last_msg_incomplete = 0;
12955 #endif
12956                                 goto do_a_copy_in;
12957
12958                         }
12959                 }
12960                 while (uio->uio_resid > 0) {
12961                         /* How much room do we have? */
12962                         struct mbuf *new_tail, *mm;
12963
12964                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12965                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12966                         else
12967                                 max_len = 0;
12968
12969                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12970                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12971                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12972                                 sndout = 0;
12973                                 new_tail = NULL;
12974                                 if (hold_tcblock) {
12975                                         SCTP_TCB_UNLOCK(stcb);
12976                                         hold_tcblock = 0;
12977                                 }
12978                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12979                                 if ((mm == NULL) || error) {
12980                                         if (mm) {
12981                                                 sctp_m_freem(mm);
12982                                         }
12983                                         goto out;
12984                                 }
12985                                 /* Update the mbuf and count */
12986                                 SCTP_TCB_SEND_LOCK(stcb);
12987                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12988                                         /*
12989                                          * we need to get out. Peer probably
12990                                          * aborted.
12991                                          */
12992                                         sctp_m_freem(mm);
12993                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12994                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12995                                                 error = ECONNRESET;
12996                                         }
12997                                         SCTP_TCB_SEND_UNLOCK(stcb);
12998                                         goto out;
12999                                 }
13000                                 if (sp->tail_mbuf) {
13001                                         /* tack it to the end */
13002                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13003                                         sp->tail_mbuf = new_tail;
13004                                 } else {
13005                                         /* A stolen mbuf */
13006                                         sp->data = mm;
13007                                         sp->tail_mbuf = new_tail;
13008                                 }
13009                                 sctp_snd_sb_alloc(stcb, sndout);
13010                                 atomic_add_int(&sp->length, sndout);
13011                                 len += sndout;
13012
13013                                 /* Did we reach EOR? */
13014                                 if ((uio->uio_resid == 0) &&
13015                                     ((user_marks_eor == 0) ||
13016                                     (srcv->sinfo_flags & SCTP_EOF) ||
13017                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13018                                         sp->msg_is_complete = 1;
13019                                 } else {
13020                                         sp->msg_is_complete = 0;
13021                                 }
13022                                 SCTP_TCB_SEND_UNLOCK(stcb);
13023                         }
13024                         if (uio->uio_resid == 0) {
13025                                 /* got it all? */
13026                                 continue;
13027                         }
13028                         /* PR-SCTP? */
13029                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13030                                 /*
13031                                  * This is ugly but we must assure locking
13032                                  * order
13033                                  */
13034                                 if (hold_tcblock == 0) {
13035                                         SCTP_TCB_LOCK(stcb);
13036                                         hold_tcblock = 1;
13037                                 }
13038                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13039                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13040                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13041                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13042                                 else
13043                                         max_len = 0;
13044                                 if (max_len > 0) {
13045                                         continue;
13046                                 }
13047                                 SCTP_TCB_UNLOCK(stcb);
13048                                 hold_tcblock = 0;
13049                         }
13050                         /* wait for space now */
13051                         if (non_blocking) {
13052                                 /* Non-blocking io in place out */
13053                                 goto skip_out_eof;
13054                         }
13055                         if ((net->flight_size > net->cwnd) &&
13056                             (asoc->sctp_cmt_on_off == 0)) {
13057                                 queue_only = 1;
13058                         } else if (asoc->ifp_had_enobuf) {
13059                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13060                                 if (net->flight_size > (net->mtu * 2)) {
13061                                         queue_only = 1;
13062                                 } else {
13063                                         queue_only = 0;
13064                                 }
13065                                 asoc->ifp_had_enobuf = 0;
13066                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13067                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13068                         } else {
13069                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13070                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13071                                 if (net->flight_size > net->cwnd) {
13072                                         queue_only = 1;
13073                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13074                                 } else {
13075                                         queue_only = 0;
13076                                 }
13077                         }
13078                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13079                             (stcb->asoc.total_flight > 0) &&
13080                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13081                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13082
13083                                 /*-
13084                                  * Ok, Nagle is set on and we have data outstanding.
13085                                  * Don't send anything and let SACKs drive out the
13086                                  * data unless wen have a "full" segment to send.
13087                                  */
13088                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13089                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13090                                 }
13091                                 SCTP_STAT_INCR(sctps_naglequeued);
13092                                 nagle_applies = 1;
13093                         } else {
13094                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13095                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13096                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13097                                 }
13098                                 SCTP_STAT_INCR(sctps_naglesent);
13099                                 nagle_applies = 0;
13100                         }
13101                         /* What about the INIT, send it maybe */
13102                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13103
13104                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13105                                     nagle_applies, un_sent);
13106                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13107                                     stcb->asoc.total_flight,
13108                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13109                         }
13110                         if (queue_only_for_init) {
13111                                 if (hold_tcblock == 0) {
13112                                         SCTP_TCB_LOCK(stcb);
13113                                         hold_tcblock = 1;
13114                                 }
13115                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13116                                         /* a collision took us forward? */
13117                                         queue_only_for_init = 0;
13118                                         queue_only = 0;
13119                                 } else {
13120                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13121                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13122                                         queue_only_for_init = 0;
13123                                         queue_only = 1;
13124                                 }
13125                         }
13126                         if ((queue_only == 0) && (nagle_applies == 0)) {
13127                                 /*-
13128                                  * need to start chunk output
13129                                  * before blocking.. note that if
13130                                  * a lock is already applied, then
13131                                  * the input via the net is happening
13132                                  * and I don't need to start output :-D
13133                                  */
13134                                 if (hold_tcblock == 0) {
13135                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13136                                                 hold_tcblock = 1;
13137                                                 sctp_chunk_output(inp,
13138                                                     stcb,
13139                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13140                                         }
13141                                 } else {
13142                                         sctp_chunk_output(inp,
13143                                             stcb,
13144                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13145                                 }
13146                                 if (hold_tcblock == 1) {
13147                                         SCTP_TCB_UNLOCK(stcb);
13148                                         hold_tcblock = 0;
13149                                 }
13150                         }
13151                         SOCKBUF_LOCK(&so->so_snd);
13152                         /*-
13153                          * This is a bit strange, but I think it will
13154                          * work. The total_output_queue_size is locked and
13155                          * protected by the TCB_LOCK, which we just released.
13156                          * There is a race that can occur between releasing it
13157                          * above, and me getting the socket lock, where sacks
13158                          * come in but we have not put the SB_WAIT on the
13159                          * so_snd buffer to get the wakeup. After the LOCK
13160                          * is applied the sack_processing will also need to
13161                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13162                          * once we have the socket buffer lock if we recheck the
13163                          * size we KNOW we will get to sleep safely with the
13164                          * wakeup flag in place.
13165                          */
13166                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13167                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13168                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13169                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13170                                             so, asoc, uio->uio_resid);
13171                                 }
13172                                 be.error = 0;
13173                                 stcb->block_entry = &be;
13174                                 error = sbwait(&so->so_snd);
13175                                 stcb->block_entry = NULL;
13176
13177                                 if (error || so->so_error || be.error) {
13178                                         if (error == 0) {
13179                                                 if (so->so_error)
13180                                                         error = so->so_error;
13181                                                 if (be.error) {
13182                                                         error = be.error;
13183                                                 }
13184                                         }
13185                                         SOCKBUF_UNLOCK(&so->so_snd);
13186                                         goto out_unlocked;
13187                                 }
13188                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13189                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13190                                             so, asoc, stcb->asoc.total_output_queue_size);
13191                                 }
13192                         }
13193                         SOCKBUF_UNLOCK(&so->so_snd);
13194                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13195                                 goto out_unlocked;
13196                         }
13197                 }
13198                 SCTP_TCB_SEND_LOCK(stcb);
13199                 if (sp) {
13200                         if (sp->msg_is_complete == 0) {
13201                                 strm->last_msg_incomplete = 1;
13202                                 asoc->stream_locked = 1;
13203                                 asoc->stream_locked_on = srcv->sinfo_stream;
13204                         } else {
13205                                 sp->sender_all_done = 1;
13206                                 strm->last_msg_incomplete = 0;
13207                                 asoc->stream_locked = 0;
13208                         }
13209                 } else {
13210                         SCTP_PRINTF("Huh no sp TSNH?\n");
13211                         strm->last_msg_incomplete = 0;
13212                         asoc->stream_locked = 0;
13213                 }
13214                 SCTP_TCB_SEND_UNLOCK(stcb);
13215                 if (uio->uio_resid == 0) {
13216                         got_all_of_the_send = 1;
13217                 }
13218         } else if (top) {
13219                 /* We send in a 0, since we do NOT have any locks */
13220                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13221                 top = NULL;
13222                 if (srcv->sinfo_flags & SCTP_EOF) {
13223                         /*
13224                          * This should only happen for Panda for the mbuf
13225                          * send case, which does NOT yet support EEOR mode.
13226                          * Thus, we can just set this flag to do the proper
13227                          * EOF handling.
13228                          */
13229                         got_all_of_the_send = 1;
13230                 }
13231         }
13232         if (error) {
13233                 goto out;
13234         }
13235 dataless_eof:
13236         /* EOF thing ? */
13237         if ((srcv->sinfo_flags & SCTP_EOF) &&
13238             (got_all_of_the_send == 1) &&
13239             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13240                 int cnt;
13241
13242                 SCTP_STAT_INCR(sctps_sends_with_eof);
13243                 error = 0;
13244                 if (hold_tcblock == 0) {
13245                         SCTP_TCB_LOCK(stcb);
13246                         hold_tcblock = 1;
13247                 }
13248                 cnt = sctp_is_there_unsent_data(stcb);
13249                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13250                     TAILQ_EMPTY(&asoc->sent_queue) &&
13251                     (cnt == 0)) {
13252                         if (asoc->locked_on_sending) {
13253                                 goto abort_anyway;
13254                         }
13255                         /* there is nothing queued to send, so I'm done... */
13256                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13257                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13258                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13259                                 /* only send SHUTDOWN the first time through */
13260                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13261                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13262                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13263                                 }
13264                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13265                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13266                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13267                                     asoc->primary_destination);
13268                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13269                                     asoc->primary_destination);
13270                         }
13271                 } else {
13272                         /*-
13273                          * we still got (or just got) data to send, so set
13274                          * SHUTDOWN_PENDING
13275                          */
13276                         /*-
13277                          * XXX sockets draft says that SCTP_EOF should be
13278                          * sent with no data.  currently, we will allow user
13279                          * data to be sent first and move to
13280                          * SHUTDOWN-PENDING
13281                          */
13282                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13283                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13284                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13285                                 if (hold_tcblock == 0) {
13286                                         SCTP_TCB_LOCK(stcb);
13287                                         hold_tcblock = 1;
13288                                 }
13289                                 if (asoc->locked_on_sending) {
13290                                         /* Locked to send out the data */
13291                                         struct sctp_stream_queue_pending *sp;
13292
13293                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13294                                         if (sp) {
13295                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13296                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13297                                         }
13298                                 }
13299                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13300                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13301                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13302                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13303                         abort_anyway:
13304                                         if (free_cnt_applied) {
13305                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13306                                                 free_cnt_applied = 0;
13307                                         }
13308                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13309                                             SCTP_RESPONSE_TO_USER_REQ,
13310                                             NULL, SCTP_SO_LOCKED);
13311                                         /*
13312                                          * now relock the stcb so everything
13313                                          * is sane
13314                                          */
13315                                         hold_tcblock = 0;
13316                                         stcb = NULL;
13317                                         goto out;
13318                                 }
13319                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13320                                     asoc->primary_destination);
13321                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13322                         }
13323                 }
13324         }
13325 skip_out_eof:
13326         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13327                 some_on_control = 1;
13328         }
13329         if ((net->flight_size > net->cwnd) &&
13330             (stcb->asoc.sctp_cmt_on_off == 0)) {
13331                 queue_only = 1;
13332         } else if (asoc->ifp_had_enobuf) {
13333                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13334                 if (net->flight_size > (net->mtu * 2)) {
13335                         queue_only = 1;
13336                 } else {
13337                         queue_only = 0;
13338                 }
13339                 asoc->ifp_had_enobuf = 0;
13340                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13341                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13342         } else {
13343                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13344                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13345                 if (net->flight_size > net->cwnd) {
13346                         queue_only = 1;
13347                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13348                 } else {
13349                         queue_only = 0;
13350                 }
13351         }
13352         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13353             (stcb->asoc.total_flight > 0) &&
13354             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13355             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13356                 /*-
13357                  * Ok, Nagle is set on and we have data outstanding.
13358                  * Don't send anything and let SACKs drive out the
13359                  * data unless wen have a "full" segment to send.
13360                  */
13361                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13362                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13363                 }
13364                 SCTP_STAT_INCR(sctps_naglequeued);
13365                 nagle_applies = 1;
13366         } else {
13367                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13368                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13369                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13370                 }
13371                 SCTP_STAT_INCR(sctps_naglesent);
13372                 nagle_applies = 0;
13373         }
13374         if (queue_only_for_init) {
13375                 if (hold_tcblock == 0) {
13376                         SCTP_TCB_LOCK(stcb);
13377                         hold_tcblock = 1;
13378                 }
13379                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13380                         /* a collision took us forward? */
13381                         queue_only_for_init = 0;
13382                         queue_only = 0;
13383                 } else {
13384                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13385                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13386                         queue_only_for_init = 0;
13387                         queue_only = 1;
13388                 }
13389         }
13390         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13391                 /* we can attempt to send too. */
13392                 if (hold_tcblock == 0) {
13393                         /*
13394                          * If there is activity recv'ing sacks no need to
13395                          * send
13396                          */
13397                         if (SCTP_TCB_TRYLOCK(stcb)) {
13398                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13399                                 hold_tcblock = 1;
13400                         }
13401                 } else {
13402                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13403                 }
13404         } else if ((queue_only == 0) &&
13405                     (stcb->asoc.peers_rwnd == 0) &&
13406             (stcb->asoc.total_flight == 0)) {
13407                 /* We get to have a probe outstanding */
13408                 if (hold_tcblock == 0) {
13409                         hold_tcblock = 1;
13410                         SCTP_TCB_LOCK(stcb);
13411                 }
13412                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13413         } else if (some_on_control) {
13414                 int num_out, reason, frag_point;
13415
13416                 /* Here we do control only */
13417                 if (hold_tcblock == 0) {
13418                         hold_tcblock = 1;
13419                         SCTP_TCB_LOCK(stcb);
13420                 }
13421                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13422                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13423                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13424         }
13425         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13426             queue_only, stcb->asoc.peers_rwnd, un_sent,
13427             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13428             stcb->asoc.total_output_queue_size, error);
13429
13430 out:
13431 out_unlocked:
13432
13433         if (local_soresv && stcb) {
13434                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13435                 local_soresv = 0;
13436         }
13437         if (create_lock_applied) {
13438                 SCTP_ASOC_CREATE_UNLOCK(inp);
13439                 create_lock_applied = 0;
13440         }
13441         if ((stcb) && hold_tcblock) {
13442                 SCTP_TCB_UNLOCK(stcb);
13443         }
13444         if (stcb && free_cnt_applied) {
13445                 atomic_add_int(&stcb->asoc.refcnt, -1);
13446         }
13447 #ifdef INVARIANTS
13448         if (stcb) {
13449                 if (mtx_owned(&stcb->tcb_mtx)) {
13450                         panic("Leaving with tcb mtx owned?");
13451                 }
13452                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13453                         panic("Leaving with tcb send mtx owned?");
13454                 }
13455         }
13456 #endif
13457 #ifdef INVARIANTS
13458         if (inp) {
13459                 sctp_validate_no_locks(inp);
13460         } else {
13461                 printf("Warning - inp is NULL so cant validate locks\n");
13462         }
13463 #endif
13464         if (top) {
13465                 sctp_m_freem(top);
13466         }
13467         if (control) {
13468                 sctp_m_freem(control);
13469         }
13470         return (error);
13471 }
13472
13473
13474 /*
13475  * generate an AUTHentication chunk, if required
13476  */
13477 struct mbuf *
13478 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13479     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13480     struct sctp_tcb *stcb, uint8_t chunk)
13481 {
13482         struct mbuf *m_auth;
13483         struct sctp_auth_chunk *auth;
13484         int chunk_len;
13485
13486         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13487             (stcb == NULL))
13488                 return (m);
13489
13490         /* sysctl disabled auth? */
13491         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13492                 return (m);
13493
13494         /* peer doesn't do auth... */
13495         if (!stcb->asoc.peer_supports_auth) {
13496                 return (m);
13497         }
13498         /* does the requested chunk require auth? */
13499         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13500                 return (m);
13501         }
13502         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13503         if (m_auth == NULL) {
13504                 /* no mbuf's */
13505                 return (m);
13506         }
13507         /* reserve some space if this will be the first mbuf */
13508         if (m == NULL)
13509                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13510         /* fill in the AUTH chunk details */
13511         auth = mtod(m_auth, struct sctp_auth_chunk *);
13512         bzero(auth, sizeof(*auth));
13513         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13514         auth->ch.chunk_flags = 0;
13515         chunk_len = sizeof(*auth) +
13516             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13517         auth->ch.chunk_length = htons(chunk_len);
13518         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13519         /* key id and hmac digest will be computed and filled in upon send */
13520
13521         /* save the offset where the auth was inserted into the chain */
13522         if (m != NULL) {
13523                 struct mbuf *cn;
13524
13525                 *offset = 0;
13526                 cn = m;
13527                 while (cn) {
13528                         *offset += SCTP_BUF_LEN(cn);
13529                         cn = SCTP_BUF_NEXT(cn);
13530                 }
13531         } else
13532                 *offset = 0;
13533
13534         /* update length and return pointer to the auth chunk */
13535         SCTP_BUF_LEN(m_auth) = chunk_len;
13536         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13537         if (auth_ret != NULL)
13538                 *auth_ret = auth;
13539
13540         return (m);
13541 }
13542
13543 #ifdef INET6
13544 int
13545 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13546 {
13547         struct nd_prefix *pfx = NULL;
13548         struct nd_pfxrouter *pfxrtr = NULL;
13549         struct sockaddr_in6 gw6;
13550
13551         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13552                 return (0);
13553
13554         /* get prefix entry of address */
13555         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13556                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13557                         continue;
13558                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13559                     &src6->sin6_addr, &pfx->ndpr_mask))
13560                         break;
13561         }
13562         /* no prefix entry in the prefix list */
13563         if (pfx == NULL) {
13564                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13565                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13566                 return (0);
13567         }
13568         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13569         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13570
13571         /* search installed gateway from prefix entry */
13572         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13573             pfxrtr->pfr_next) {
13574                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13575                 gw6.sin6_family = AF_INET6;
13576                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13577                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13578                     sizeof(struct in6_addr));
13579                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13580                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13581                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13582                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13583                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13584                     ro->ro_rt->rt_gateway)) {
13585                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13586                         return (1);
13587                 }
13588         }
13589         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13590         return (0);
13591 }
13592
13593 #endif
13594
13595 int
13596 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13597 {
13598         struct sockaddr_in *sin, *mask;
13599         struct ifaddr *ifa;
13600         struct in_addr srcnetaddr, gwnetaddr;
13601
13602         if (ro == NULL || ro->ro_rt == NULL ||
13603             sifa->address.sa.sa_family != AF_INET) {
13604                 return (0);
13605         }
13606         ifa = (struct ifaddr *)sifa->ifa;
13607         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13608         sin = (struct sockaddr_in *)&sifa->address.sin;
13609         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13610         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13611         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13612         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13613
13614         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13615         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13616         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13617         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13618         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13619         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13620                 return (1);
13621         }
13622         return (0);
13623 }