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         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3393                 return (0);
3394
3395         return (SCTP_ECT0_BIT);
3396 }
3397
3398 static int
3399 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3400     struct sctp_tcb *stcb,      /* may be NULL */
3401     struct sctp_nets *net,
3402     struct sockaddr *to,
3403     struct mbuf *m,
3404     uint32_t auth_offset,
3405     struct sctp_auth_chunk *auth,
3406     uint16_t auth_keyid,
3407     int nofragment_flag,
3408     int ecn_ok,
3409     struct sctp_tmit_chunk *chk,
3410     int out_of_asoc_ok,
3411     uint16_t src_port,
3412     uint16_t dest_port,
3413     uint32_t v_tag,
3414     uint16_t port,
3415     int so_locked,
3416 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3417     SCTP_UNUSED
3418 #endif
3419     union sctp_sockstore *over_addr
3420 )
3421 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3422 {
3423         /*
3424          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3425          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3426          * structure: - fill in the HMAC digest of any AUTH chunk in the
3427          * packet. - calculate and fill in the SCTP checksum. - prepend an
3428          * IP address header. - if boundall use INADDR_ANY. - if
3429          * boundspecific do source address selection. - set fragmentation
3430          * option for ipV4. - On return from IP output, check/adjust mtu
3431          * size of output interface and smallest_mtu size as well.
3432          */
3433         /* Will need ifdefs around this */
3434         struct mbuf *o_pak;
3435         struct mbuf *newm;
3436         struct sctphdr *sctphdr;
3437         int packet_length;
3438         int ret;
3439         uint32_t vrf_id;
3440         sctp_route_t *ro = NULL;
3441         struct udphdr *udp = NULL;
3442
3443 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3444         struct socket *so = NULL;
3445
3446 #endif
3447
3448         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3449                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3450                 sctp_m_freem(m);
3451                 return (EFAULT);
3452         }
3453         if (stcb) {
3454                 vrf_id = stcb->asoc.vrf_id;
3455         } else {
3456                 vrf_id = inp->def_vrf_id;
3457         }
3458
3459         /* fill in the HMAC digest for any AUTH chunk in the packet */
3460         if ((auth != NULL) && (stcb != NULL)) {
3461                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3462         }
3463         if (to->sa_family == AF_INET) {
3464                 struct ip *ip = NULL;
3465                 sctp_route_t iproute;
3466                 uint8_t tos_value;
3467                 int len;
3468
3469                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3470                 if (port) {
3471                         len += sizeof(struct udphdr);
3472                 }
3473                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3474                 if (newm == NULL) {
3475                         sctp_m_freem(m);
3476                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3477                         return (ENOMEM);
3478                 }
3479                 SCTP_ALIGN_TO_END(newm, len);
3480                 SCTP_BUF_LEN(newm) = len;
3481                 SCTP_BUF_NEXT(newm) = m;
3482                 m = newm;
3483                 packet_length = sctp_calculate_len(m);
3484                 ip = mtod(m, struct ip *);
3485                 ip->ip_v = IPVERSION;
3486                 ip->ip_hl = (sizeof(struct ip) >> 2);
3487                 if (net) {
3488                         tos_value = net->tos_flowlabel & 0x000000ff;
3489                 } else {
3490                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3491                 }
3492                 if ((nofragment_flag) && (port == 0)) {
3493                         ip->ip_off = IP_DF;
3494                 } else
3495                         ip->ip_off = 0;
3496
3497                 /* FreeBSD has a function for ip_id's */
3498                 ip->ip_id = ip_newid();
3499
3500                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3501                 ip->ip_len = packet_length;
3502                 if (stcb) {
3503                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3504                                 /* Enable ECN */
3505                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3506                         } else {
3507                                 /* No ECN */
3508                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3509                         }
3510                 } else {
3511                         /* no association at all */
3512                         ip->ip_tos = (tos_value & 0xfc);
3513                 }
3514                 if (port) {
3515                         ip->ip_p = IPPROTO_UDP;
3516                 } else {
3517                         ip->ip_p = IPPROTO_SCTP;
3518                 }
3519                 ip->ip_sum = 0;
3520                 if (net == NULL) {
3521                         ro = &iproute;
3522                         memset(&iproute, 0, sizeof(iproute));
3523                         memcpy(&ro->ro_dst, to, to->sa_len);
3524                 } else {
3525                         ro = (sctp_route_t *) & net->ro;
3526                 }
3527                 /* Now the address selection part */
3528                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3529
3530                 /* call the routine to select the src address */
3531                 if (net && out_of_asoc_ok == 0) {
3532                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3533                                 sctp_free_ifa(net->ro._s_addr);
3534                                 net->ro._s_addr = NULL;
3535                                 net->src_addr_selected = 0;
3536                                 if (ro->ro_rt) {
3537                                         RTFREE(ro->ro_rt);
3538                                         ro->ro_rt = NULL;
3539                                 }
3540                         }
3541                         if (net->src_addr_selected == 0) {
3542                                 /* Cache the source address */
3543                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3544                                     ro, net, 0,
3545                                     vrf_id);
3546                                 net->src_addr_selected = 1;
3547                         }
3548                         if (net->ro._s_addr == NULL) {
3549                                 /* No route to host */
3550                                 net->src_addr_selected = 0;
3551                                 goto no_route;
3552                         }
3553                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3554                 } else {
3555                         if (over_addr == NULL) {
3556                                 struct sctp_ifa *_lsrc;
3557
3558                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3559                                     net,
3560                                     out_of_asoc_ok,
3561                                     vrf_id);
3562                                 if (_lsrc == NULL) {
3563                                         goto no_route;
3564                                 }
3565                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3566                                 sctp_free_ifa(_lsrc);
3567                         } else {
3568                                 ip->ip_src = over_addr->sin.sin_addr;
3569                                 SCTP_RTALLOC(ro, vrf_id);
3570                         }
3571                 }
3572                 if (port) {
3573                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3574                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3575                         udp->uh_dport = port;
3576                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3577                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3578                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3579                 } else {
3580                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3581                 }
3582
3583                 sctphdr->src_port = src_port;
3584                 sctphdr->dest_port = dest_port;
3585                 sctphdr->v_tag = v_tag;
3586                 sctphdr->checksum = 0;
3587
3588                 /*
3589                  * If source address selection fails and we find no route
3590                  * then the ip_output should fail as well with a
3591                  * NO_ROUTE_TO_HOST type error. We probably should catch
3592                  * that somewhere and abort the association right away
3593                  * (assuming this is an INIT being sent).
3594                  */
3595                 if ((ro->ro_rt == NULL)) {
3596                         /*
3597                          * src addr selection failed to find a route (or
3598                          * valid source addr), so we can't get there from
3599                          * here (yet)!
3600                          */
3601         no_route:
3602                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3603                             "%s: dropped packet - no valid source addr\n",
3604                             __FUNCTION__);
3605                         if (net) {
3606                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3607                                     "Destination was ");
3608                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3609                                     &net->ro._l_addr.sa);
3610                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3611                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3612                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3613                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3614                                                     stcb,
3615                                                     SCTP_FAILED_THRESHOLD,
3616                                                     (void *)net,
3617                                                     so_locked);
3618                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3619                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3620                                                 /*
3621                                                  * JRS 5/14/07 - If a
3622                                                  * destination is
3623                                                  * unreachable, the PF bit
3624                                                  * is turned off.  This
3625                                                  * allows an unambiguous use
3626                                                  * of the PF bit for
3627                                                  * destinations that are
3628                                                  * reachable but potentially
3629                                                  * failed. If the
3630                                                  * destination is set to the
3631                                                  * unreachable state, also
3632                                                  * set the destination to
3633                                                  * the PF state.
3634                                                  */
3635                                                 /*
3636                                                  * Add debug message here if
3637                                                  * destination is not in PF
3638                                                  * state.
3639                                                  */
3640                                                 /*
3641                                                  * Stop any running T3
3642                                                  * timers here?
3643                                                  */
3644                                                 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
3645                                                     (stcb->asoc.sctp_cmt_pf > 0)) {
3646                                                         net->dest_state &= ~SCTP_ADDR_PF;
3647                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3648                                                             net);
3649                                                 }
3650                                         }
3651                                 }
3652                                 if (stcb) {
3653                                         if (net == stcb->asoc.primary_destination) {
3654                                                 /* need a new primary */
3655                                                 struct sctp_nets *alt;
3656
3657                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3658                                                 if (alt != net) {
3659                                                         if (sctp_set_primary_addr(stcb,
3660                                                             (struct sockaddr *)NULL,
3661                                                             alt) == 0) {
3662                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3663                                                                 if (net->ro._s_addr) {
3664                                                                         sctp_free_ifa(net->ro._s_addr);
3665                                                                         net->ro._s_addr = NULL;
3666                                                                 }
3667                                                                 net->src_addr_selected = 0;
3668                                                         }
3669                                                 }
3670                                         }
3671                                 }
3672                         }
3673                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3674                         sctp_m_freem(m);
3675                         return (EHOSTUNREACH);
3676                 }
3677                 if (ro != &iproute) {
3678                         memcpy(&iproute, ro, sizeof(*ro));
3679                 }
3680                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3681                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3682                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3683                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3684                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3685                     ro->ro_rt);
3686
3687                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3688                         /* failed to prepend data, give up */
3689                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3690                         sctp_m_freem(m);
3691                         return (ENOMEM);
3692                 }
3693 #ifdef  SCTP_PACKET_LOGGING
3694                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3695                         sctp_packet_log(m, packet_length);
3696 #endif
3697                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3698                 if (port) {
3699 #if defined(SCTP_WITH_NO_CSUM)
3700                         SCTP_STAT_INCR(sctps_sendnocrc);
3701 #else
3702                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3703                             (stcb) &&
3704                             (stcb->asoc.loopback_scope))) {
3705                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3706                                 SCTP_STAT_INCR(sctps_sendswcrc);
3707                         } else {
3708                                 SCTP_STAT_INCR(sctps_sendnocrc);
3709                         }
3710 #endif
3711                         SCTP_ENABLE_UDP_CSUM(o_pak);
3712                 } else {
3713 #if defined(SCTP_WITH_NO_CSUM)
3714                         SCTP_STAT_INCR(sctps_sendnocrc);
3715 #else
3716                         m->m_pkthdr.csum_flags = CSUM_SCTP;
3717                         m->m_pkthdr.csum_data = 0;
3718                         SCTP_STAT_INCR(sctps_sendhwcrc);
3719 #endif
3720                 }
3721                 /* send it out.  table id is taken from stcb */
3722 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3723                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3724                         so = SCTP_INP_SO(inp);
3725                         SCTP_SOCKET_UNLOCK(so, 0);
3726                 }
3727 #endif
3728                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3729 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3730                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3731                         atomic_add_int(&stcb->asoc.refcnt, 1);
3732                         SCTP_TCB_UNLOCK(stcb);
3733                         SCTP_SOCKET_LOCK(so, 0);
3734                         SCTP_TCB_LOCK(stcb);
3735                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3736                 }
3737 #endif
3738                 SCTP_STAT_INCR(sctps_sendpackets);
3739                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3740                 if (ret)
3741                         SCTP_STAT_INCR(sctps_senderrors);
3742
3743                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3744                 if (net == NULL) {
3745                         /* free tempy routes */
3746                         if (ro->ro_rt) {
3747                                 RTFREE(ro->ro_rt);
3748                                 ro->ro_rt = NULL;
3749                         }
3750                 } else {
3751                         /* PMTU check versus smallest asoc MTU goes here */
3752                         if ((ro->ro_rt != NULL) &&
3753                             (net->ro._s_addr)) {
3754                                 uint32_t mtu;
3755
3756                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3757                                 if (net->port) {
3758                                         mtu -= sizeof(struct udphdr);
3759                                 }
3760                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3761                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3762                                         net->mtu = mtu;
3763                                 }
3764                         } else if (ro->ro_rt == NULL) {
3765                                 /* route was freed */
3766                                 if (net->ro._s_addr &&
3767                                     net->src_addr_selected) {
3768                                         sctp_free_ifa(net->ro._s_addr);
3769                                         net->ro._s_addr = NULL;
3770                                 }
3771                                 net->src_addr_selected = 0;
3772                         }
3773                 }
3774                 return (ret);
3775         }
3776 #ifdef INET6
3777         else if (to->sa_family == AF_INET6) {
3778                 uint32_t flowlabel;
3779                 struct ip6_hdr *ip6h;
3780                 struct route_in6 ip6route;
3781                 struct ifnet *ifp;
3782                 u_char flowTop;
3783                 uint16_t flowBottom;
3784                 u_char tosBottom, tosTop;
3785                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3786                 int prev_scope = 0;
3787                 struct sockaddr_in6 lsa6_storage;
3788                 int error;
3789                 u_short prev_port = 0;
3790                 int len;
3791
3792                 if (net != NULL) {
3793                         flowlabel = net->tos_flowlabel;
3794                 } else {
3795                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3796                 }
3797
3798                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3799                 if (port) {
3800                         len += sizeof(struct udphdr);
3801                 }
3802                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3803                 if (newm == NULL) {
3804                         sctp_m_freem(m);
3805                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3806                         return (ENOMEM);
3807                 }
3808                 SCTP_ALIGN_TO_END(newm, len);
3809                 SCTP_BUF_LEN(newm) = len;
3810                 SCTP_BUF_NEXT(newm) = m;
3811                 m = newm;
3812                 packet_length = sctp_calculate_len(m);
3813
3814                 ip6h = mtod(m, struct ip6_hdr *);
3815                 /*
3816                  * We assume here that inp_flow is in host byte order within
3817                  * the TCB!
3818                  */
3819                 flowBottom = flowlabel & 0x0000ffff;
3820                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3821                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3822                 /* protect *sin6 from overwrite */
3823                 sin6 = (struct sockaddr_in6 *)to;
3824                 tmp = *sin6;
3825                 sin6 = &tmp;
3826
3827                 /* KAME hack: embed scopeid */
3828                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3829                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3830                         return (EINVAL);
3831                 }
3832                 if (net == NULL) {
3833                         memset(&ip6route, 0, sizeof(ip6route));
3834                         ro = (sctp_route_t *) & ip6route;
3835                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3836                 } else {
3837                         ro = (sctp_route_t *) & net->ro;
3838                 }
3839                 if (stcb != NULL) {
3840                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3841                                 /* Enable ECN */
3842                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3843                         } else {
3844                                 /* No ECN */
3845                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3846                         }
3847                 } else {
3848                         /* we could get no asoc if it is a O-O-T-B packet */
3849                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3850                 }
3851                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3852                 if (port) {
3853                         ip6h->ip6_nxt = IPPROTO_UDP;
3854                 } else {
3855                         ip6h->ip6_nxt = IPPROTO_SCTP;
3856                 }
3857                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3858                 ip6h->ip6_dst = sin6->sin6_addr;
3859
3860                 /*
3861                  * Add SRC address selection here: we can only reuse to a
3862                  * limited degree the kame src-addr-sel, since we can try
3863                  * their selection but it may not be bound.
3864                  */
3865                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3866                 lsa6_tmp.sin6_family = AF_INET6;
3867                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3868                 lsa6 = &lsa6_tmp;
3869                 if (net && out_of_asoc_ok == 0) {
3870                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3871                                 sctp_free_ifa(net->ro._s_addr);
3872                                 net->ro._s_addr = NULL;
3873                                 net->src_addr_selected = 0;
3874                                 if (ro->ro_rt) {
3875                                         RTFREE(ro->ro_rt);
3876                                         ro->ro_rt = NULL;
3877                                 }
3878                         }
3879                         if (net->src_addr_selected == 0) {
3880                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3881                                 /* KAME hack: embed scopeid */
3882                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3883                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3884                                         return (EINVAL);
3885                                 }
3886                                 /* Cache the source address */
3887                                 net->ro._s_addr = sctp_source_address_selection(inp,
3888                                     stcb,
3889                                     ro,
3890                                     net,
3891                                     0,
3892                                     vrf_id);
3893                                 (void)sa6_recoverscope(sin6);
3894                                 net->src_addr_selected = 1;
3895                         }
3896                         if (net->ro._s_addr == NULL) {
3897                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3898                                 net->src_addr_selected = 0;
3899                                 goto no_route;
3900                         }
3901                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3902                 } else {
3903                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3904                         /* KAME hack: embed scopeid */
3905                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3906                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3907                                 return (EINVAL);
3908                         }
3909                         if (over_addr == NULL) {
3910                                 struct sctp_ifa *_lsrc;
3911
3912                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3913                                     net,
3914                                     out_of_asoc_ok,
3915                                     vrf_id);
3916                                 if (_lsrc == NULL) {
3917                                         goto no_route;
3918                                 }
3919                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3920                                 sctp_free_ifa(_lsrc);
3921                         } else {
3922                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3923                                 SCTP_RTALLOC(ro, vrf_id);
3924                         }
3925                         (void)sa6_recoverscope(sin6);
3926                 }
3927                 lsa6->sin6_port = inp->sctp_lport;
3928
3929                 if (ro->ro_rt == NULL) {
3930                         /*
3931                          * src addr selection failed to find a route (or
3932                          * valid source addr), so we can't get there from
3933                          * here!
3934                          */
3935                         goto no_route;
3936                 }
3937                 /*
3938                  * XXX: sa6 may not have a valid sin6_scope_id in the
3939                  * non-SCOPEDROUTING case.
3940                  */
3941                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3942                 lsa6_storage.sin6_family = AF_INET6;
3943                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3944                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3945                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3946                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3947                         sctp_m_freem(m);
3948                         return (error);
3949                 }
3950                 /* XXX */
3951                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3952                 lsa6_storage.sin6_port = inp->sctp_lport;
3953                 lsa6 = &lsa6_storage;
3954                 ip6h->ip6_src = lsa6->sin6_addr;
3955
3956                 if (port) {
3957                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3958                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3959                         udp->uh_dport = port;
3960                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3961                         udp->uh_sum = 0;
3962                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3963                 } else {
3964                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3965                 }
3966
3967                 sctphdr->src_port = src_port;
3968                 sctphdr->dest_port = dest_port;
3969                 sctphdr->v_tag = v_tag;
3970                 sctphdr->checksum = 0;
3971
3972                 /*
3973                  * We set the hop limit now since there is a good chance
3974                  * that our ro pointer is now filled
3975                  */
3976                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3977                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3978
3979 #ifdef SCTP_DEBUG
3980                 /* Copy to be sure something bad is not happening */
3981                 sin6->sin6_addr = ip6h->ip6_dst;
3982                 lsa6->sin6_addr = ip6h->ip6_src;
3983 #endif
3984
3985                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3986                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3987                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3988                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3989                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3990                 if (net) {
3991                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3992                         /* preserve the port and scope for link local send */
3993                         prev_scope = sin6->sin6_scope_id;
3994                         prev_port = sin6->sin6_port;
3995                 }
3996                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3997                         /* failed to prepend data, give up */
3998                         sctp_m_freem(m);
3999                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4000                         return (ENOMEM);
4001                 }
4002 #ifdef  SCTP_PACKET_LOGGING
4003                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4004                         sctp_packet_log(m, packet_length);
4005 #endif
4006                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4007                 if (port) {
4008 #if defined(SCTP_WITH_NO_CSUM)
4009                         SCTP_STAT_INCR(sctps_sendnocrc);
4010 #else
4011                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4012                             (stcb) &&
4013                             (stcb->asoc.loopback_scope))) {
4014                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4015                                 SCTP_STAT_INCR(sctps_sendswcrc);
4016                         } else {
4017                                 SCTP_STAT_INCR(sctps_sendnocrc);
4018                         }
4019 #endif
4020                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4021                                 udp->uh_sum = 0xffff;
4022                         }
4023                 } else {
4024 #if defined(SCTP_WITH_NO_CSUM)
4025                         SCTP_STAT_INCR(sctps_sendnocrc);
4026 #else
4027                         m->m_pkthdr.csum_flags = CSUM_SCTP;
4028                         m->m_pkthdr.csum_data = 0;
4029                         SCTP_STAT_INCR(sctps_sendhwcrc);
4030 #endif
4031                 }
4032                 /* send it out. table id is taken from stcb */
4033 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4034                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4035                         so = SCTP_INP_SO(inp);
4036                         SCTP_SOCKET_UNLOCK(so, 0);
4037                 }
4038 #endif
4039                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4040 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4041                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4042                         atomic_add_int(&stcb->asoc.refcnt, 1);
4043                         SCTP_TCB_UNLOCK(stcb);
4044                         SCTP_SOCKET_LOCK(so, 0);
4045                         SCTP_TCB_LOCK(stcb);
4046                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4047                 }
4048 #endif
4049                 if (net) {
4050                         /* for link local this must be done */
4051                         sin6->sin6_scope_id = prev_scope;
4052                         sin6->sin6_port = prev_port;
4053                 }
4054                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4055                 SCTP_STAT_INCR(sctps_sendpackets);
4056                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4057                 if (ret) {
4058                         SCTP_STAT_INCR(sctps_senderrors);
4059                 }
4060                 if (net == NULL) {
4061                         /* Now if we had a temp route free it */
4062                         if (ro->ro_rt) {
4063                                 RTFREE(ro->ro_rt);
4064                         }
4065                 } else {
4066                         /* PMTU check versus smallest asoc MTU goes here */
4067                         if (ro->ro_rt == NULL) {
4068                                 /* Route was freed */
4069                                 if (net->ro._s_addr &&
4070                                     net->src_addr_selected) {
4071                                         sctp_free_ifa(net->ro._s_addr);
4072                                         net->ro._s_addr = NULL;
4073                                 }
4074                                 net->src_addr_selected = 0;
4075                         }
4076                         if ((ro->ro_rt != NULL) &&
4077                             (net->ro._s_addr)) {
4078                                 uint32_t mtu;
4079
4080                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4081                                 if (mtu &&
4082                                     (stcb->asoc.smallest_mtu > mtu)) {
4083                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4084                                         net->mtu = mtu;
4085                                         if (net->port) {
4086                                                 net->mtu -= sizeof(struct udphdr);
4087                                         }
4088                                 }
4089                         } else if (ifp) {
4090                                 if (ND_IFINFO(ifp)->linkmtu &&
4091                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4092                                         sctp_mtu_size_reset(inp,
4093                                             &stcb->asoc,
4094                                             ND_IFINFO(ifp)->linkmtu);
4095                                 }
4096                         }
4097                 }
4098                 return (ret);
4099         }
4100 #endif
4101         else {
4102                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4103                     ((struct sockaddr *)to)->sa_family);
4104                 sctp_m_freem(m);
4105                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4106                 return (EFAULT);
4107         }
4108 }
4109
4110
4111 void
4112 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4113 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4114     SCTP_UNUSED
4115 #endif
4116 )
4117 {
4118         struct mbuf *m, *m_at, *mp_last;
4119         struct sctp_nets *net;
4120         struct sctp_init_chunk *init;
4121         struct sctp_supported_addr_param *sup_addr;
4122         struct sctp_adaptation_layer_indication *ali;
4123         struct sctp_ecn_supported_param *ecn;
4124         struct sctp_prsctp_supported_param *prsctp;
4125         struct sctp_supported_chunk_types_param *pr_supported;
4126         int cnt_inits_to = 0;
4127         int padval, ret;
4128         int num_ext;
4129         int p_len;
4130
4131         /* INIT's always go to the primary (and usually ONLY address) */
4132         mp_last = NULL;
4133         net = stcb->asoc.primary_destination;
4134         if (net == NULL) {
4135                 net = TAILQ_FIRST(&stcb->asoc.nets);
4136                 if (net == NULL) {
4137                         /* TSNH */
4138                         return;
4139                 }
4140                 /* we confirm any address we send an INIT to */
4141                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4142                 (void)sctp_set_primary_addr(stcb, NULL, net);
4143         } else {
4144                 /* we confirm any address we send an INIT to */
4145                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4146         }
4147         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4148 #ifdef INET6
4149         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4150                 /*
4151                  * special hook, if we are sending to link local it will not
4152                  * show up in our private address count.
4153                  */
4154                 struct sockaddr_in6 *sin6l;
4155
4156                 sin6l = &net->ro._l_addr.sin6;
4157                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4158                         cnt_inits_to = 1;
4159         }
4160 #endif
4161         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4162                 /* This case should not happen */
4163                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4164                 return;
4165         }
4166         /* start the INIT timer */
4167         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4168
4169         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4170         if (m == NULL) {
4171                 /* No memory, INIT timer will re-attempt. */
4172                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4173                 return;
4174         }
4175         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4176         /*
4177          * assume peer supports asconf in order to be able to queue local
4178          * address changes while an INIT is in flight and before the assoc
4179          * is established.
4180          */
4181         stcb->asoc.peer_supports_asconf = 1;
4182         /* Now lets put the SCTP header in place */
4183         init = mtod(m, struct sctp_init_chunk *);
4184         /* now the chunk header */
4185         init->ch.chunk_type = SCTP_INITIATION;
4186         init->ch.chunk_flags = 0;
4187         /* fill in later from mbuf we build */
4188         init->ch.chunk_length = 0;
4189         /* place in my tag */
4190         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4191         /* set up some of the credits. */
4192         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4193             SCTP_MINIMAL_RWND));
4194
4195         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4196         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4197         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4198         /* now the address restriction */
4199         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4200             sizeof(*init));
4201         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4202 #ifdef INET6
4203         /* we support 2 types: IPv6/IPv4 */
4204         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4205         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4206         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4207 #else
4208         /* we support 1 type: IPv4 */
4209         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4210         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4211         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4212 #endif
4213         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4214         /* adaptation layer indication parameter */
4215         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4216         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4217         ali->ph.param_length = htons(sizeof(*ali));
4218         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4219         SCTP_BUF_LEN(m) += sizeof(*ali);
4220         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4221
4222         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4223                 /* Add NAT friendly parameter */
4224                 struct sctp_paramhdr *ph;
4225
4226                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4227                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4228                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4229                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4230                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4231         }
4232         /* now any cookie time extensions */
4233         if (stcb->asoc.cookie_preserve_req) {
4234                 struct sctp_cookie_perserve_param *cookie_preserve;
4235
4236                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4237                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4238                 cookie_preserve->ph.param_length = htons(
4239                     sizeof(*cookie_preserve));
4240                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4241                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4242                 ecn = (struct sctp_ecn_supported_param *)(
4243                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4244                 stcb->asoc.cookie_preserve_req = 0;
4245         }
4246         /* ECN parameter */
4247         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4248                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4249                 ecn->ph.param_length = htons(sizeof(*ecn));
4250                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4251                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4252                     sizeof(*ecn));
4253         } else {
4254                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4255         }
4256         /* And now tell the peer we do pr-sctp */
4257         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4258         prsctp->ph.param_length = htons(sizeof(*prsctp));
4259         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4260
4261         /* And now tell the peer we do all the extensions */
4262         pr_supported = (struct sctp_supported_chunk_types_param *)
4263             ((caddr_t)prsctp + sizeof(*prsctp));
4264         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4265         num_ext = 0;
4266         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4267         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4268         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4269         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4270         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4271         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4272                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4273         }
4274         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4275                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4276         }
4277         p_len = sizeof(*pr_supported) + num_ext;
4278         pr_supported->ph.param_length = htons(p_len);
4279         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4280         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4281
4282
4283         /* add authentication parameters */
4284         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4285                 struct sctp_auth_random *randp;
4286                 struct sctp_auth_hmac_algo *hmacs;
4287                 struct sctp_auth_chunk_list *chunks;
4288
4289                 /* attach RANDOM parameter, if available */
4290                 if (stcb->asoc.authinfo.random != NULL) {
4291                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4292                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4293                         /* random key already contains the header */
4294                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4295                         /* zero out any padding required */
4296                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4297                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4298                 }
4299                 /* add HMAC_ALGO parameter */
4300                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4301                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4302                     (uint8_t *) hmacs->hmac_ids);
4303                 if (p_len > 0) {
4304                         p_len += sizeof(*hmacs);
4305                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4306                         hmacs->ph.param_length = htons(p_len);
4307                         /* zero out any padding required */
4308                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4309                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4310                 }
4311                 /* add CHUNKS parameter */
4312                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4313                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4314                     chunks->chunk_types);
4315                 if (p_len > 0) {
4316                         p_len += sizeof(*chunks);
4317                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4318                         chunks->ph.param_length = htons(p_len);
4319                         /* zero out any padding required */
4320                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4321                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4322                 }
4323         }
4324         m_at = m;
4325         /* now the addresses */
4326         {
4327                 struct sctp_scoping scp;
4328
4329                 /*
4330                  * To optimize this we could put the scoping stuff into a
4331                  * structure and remove the individual uint8's from the
4332                  * assoc structure. Then we could just sifa in the address
4333                  * within the stcb.. but for now this is a quick hack to get
4334                  * the address stuff teased apart.
4335                  */
4336                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4337                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4338                 scp.loopback_scope = stcb->asoc.loopback_scope;
4339                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4340                 scp.local_scope = stcb->asoc.local_scope;
4341                 scp.site_scope = stcb->asoc.site_scope;
4342
4343                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4344         }
4345
4346         /* calulate the size and update pkt header and chunk header */
4347         p_len = 0;
4348         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4349                 if (SCTP_BUF_NEXT(m_at) == NULL)
4350                         mp_last = m_at;
4351                 p_len += SCTP_BUF_LEN(m_at);
4352         }
4353         init->ch.chunk_length = htons(p_len);
4354         /*
4355          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4356          * here since the timer will drive a retranmission.
4357          */
4358
4359         /* I don't expect this to execute but we will be safe here */
4360         padval = p_len % 4;
4361         if ((padval) && (mp_last)) {
4362                 /*
4363                  * The compiler worries that mp_last may not be set even
4364                  * though I think it is impossible :-> however we add
4365                  * mp_last here just in case.
4366                  */
4367                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4368                 if (ret) {
4369                         /* Houston we have a problem, no space */
4370                         sctp_m_freem(m);
4371                         return;
4372                 }
4373                 p_len += padval;
4374         }
4375         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4376         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4377             (struct sockaddr *)&net->ro._l_addr,
4378             m, 0, NULL, 0, 0, 0, NULL, 0,
4379             inp->sctp_lport, stcb->rport, htonl(0),
4380             net->port, so_locked, NULL);
4381         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4382         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4383         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4384 }
4385
4386 struct mbuf *
4387 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4388     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4389 {
4390         /*
4391          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4392          * being equal to the beginning of the params i.e. (iphlen +
4393          * sizeof(struct sctp_init_msg) parse through the parameters to the
4394          * end of the mbuf verifying that all parameters are known.
4395          *
4396          * For unknown parameters build and return a mbuf with
4397          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4398          * processing this chunk stop, and set *abort_processing to 1.
4399          *
4400          * By having param_offset be pre-set to where parameters begin it is
4401          * hoped that this routine may be reused in the future by new
4402          * features.
4403          */
4404         struct sctp_paramhdr *phdr, params;
4405
4406         struct mbuf *mat, *op_err;
4407         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4408         int at, limit, pad_needed;
4409         uint16_t ptype, plen, padded_size;
4410         int err_at;
4411
4412         *abort_processing = 0;
4413         mat = in_initpkt;
4414         err_at = 0;
4415         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4416         at = param_offset;
4417         op_err = NULL;
4418         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4419         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4420         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4421                 ptype = ntohs(phdr->param_type);
4422                 plen = ntohs(phdr->param_length);
4423                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4424                         /* wacked parameter */
4425                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4426                         goto invalid_size;
4427                 }
4428                 limit -= SCTP_SIZE32(plen);
4429                 /*-
4430                  * All parameters for all chunks that we know/understand are
4431                  * listed here. We process them other places and make
4432                  * appropriate stop actions per the upper bits. However this
4433                  * is the generic routine processor's can call to get back
4434                  * an operr.. to either incorporate (init-ack) or send.
4435                  */
4436                 padded_size = SCTP_SIZE32(plen);
4437                 switch (ptype) {
4438                         /* Param's with variable size */
4439                 case SCTP_HEARTBEAT_INFO:
4440                 case SCTP_STATE_COOKIE:
4441                 case SCTP_UNRECOG_PARAM:
4442                 case SCTP_ERROR_CAUSE_IND:
4443                         /* ok skip fwd */
4444                         at += padded_size;
4445                         break;
4446                         /* Param's with variable size within a range */
4447                 case SCTP_CHUNK_LIST:
4448                 case SCTP_SUPPORTED_CHUNK_EXT:
4449                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4450                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4451                                 goto invalid_size;
4452                         }
4453                         at += padded_size;
4454                         break;
4455                 case SCTP_SUPPORTED_ADDRTYPE:
4456                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4457                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4458                                 goto invalid_size;
4459                         }
4460                         at += padded_size;
4461                         break;
4462                 case SCTP_RANDOM:
4463                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4464                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4465                                 goto invalid_size;
4466                         }
4467                         at += padded_size;
4468                         break;
4469                 case SCTP_SET_PRIM_ADDR:
4470                 case SCTP_DEL_IP_ADDRESS:
4471                 case SCTP_ADD_IP_ADDRESS:
4472                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4473                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4474                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4475                                 goto invalid_size;
4476                         }
4477                         at += padded_size;
4478                         break;
4479                         /* Param's with a fixed size */
4480                 case SCTP_IPV4_ADDRESS:
4481                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4482                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4483                                 goto invalid_size;
4484                         }
4485                         at += padded_size;
4486                         break;
4487                 case SCTP_IPV6_ADDRESS:
4488                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4489                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4490                                 goto invalid_size;
4491                         }
4492                         at += padded_size;
4493                         break;
4494                 case SCTP_COOKIE_PRESERVE:
4495                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4496                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4497                                 goto invalid_size;
4498                         }
4499                         at += padded_size;
4500                         break;
4501                 case SCTP_HAS_NAT_SUPPORT:
4502                         *nat_friendly = 1;
4503                         /* fall through */
4504                 case SCTP_PRSCTP_SUPPORTED:
4505
4506                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4507                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4508                                 goto invalid_size;
4509                         }
4510                         at += padded_size;
4511                         break;
4512                 case SCTP_ECN_CAPABLE:
4513                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4514                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4515                                 goto invalid_size;
4516                         }
4517                         at += padded_size;
4518                         break;
4519                 case SCTP_ULP_ADAPTATION:
4520                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4521                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4522                                 goto invalid_size;
4523                         }
4524                         at += padded_size;
4525                         break;
4526                 case SCTP_SUCCESS_REPORT:
4527                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4528                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4529                                 goto invalid_size;
4530                         }
4531                         at += padded_size;
4532                         break;
4533                 case SCTP_HOSTNAME_ADDRESS:
4534                         {
4535                                 /* We can NOT handle HOST NAME addresses!! */
4536                                 int l_len;
4537
4538                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4539                                 *abort_processing = 1;
4540                                 if (op_err == NULL) {
4541                                         /* Ok need to try to get a mbuf */
4542 #ifdef INET6
4543                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4544 #else
4545                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4546 #endif
4547                                         l_len += plen;
4548                                         l_len += sizeof(struct sctp_paramhdr);
4549                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4550                                         if (op_err) {
4551                                                 SCTP_BUF_LEN(op_err) = 0;
4552                                                 /*
4553                                                  * pre-reserve space for ip
4554                                                  * and sctp header  and
4555                                                  * chunk hdr
4556                                                  */
4557 #ifdef INET6
4558                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4559 #else
4560                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4561 #endif
4562                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4563                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4564                                         }
4565                                 }
4566                                 if (op_err) {
4567                                         /* If we have space */
4568                                         struct sctp_paramhdr s;
4569
4570                                         if (err_at % 4) {
4571                                                 uint32_t cpthis = 0;
4572
4573                                                 pad_needed = 4 - (err_at % 4);
4574                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4575                                                 err_at += pad_needed;
4576                                         }
4577                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4578                                         s.param_length = htons(sizeof(s) + plen);
4579                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4580                                         err_at += sizeof(s);
4581                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4582                                         if (phdr == NULL) {
4583                                                 sctp_m_freem(op_err);
4584                                                 /*
4585                                                  * we are out of memory but
4586                                                  * we still need to have a
4587                                                  * look at what to do (the
4588                                                  * system is in trouble
4589                                                  * though).
4590                                                  */
4591                                                 return (NULL);
4592                                         }
4593                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4594                                         err_at += plen;
4595                                 }
4596                                 return (op_err);
4597                                 break;
4598                         }
4599                 default:
4600                         /*
4601                          * we do not recognize the parameter figure out what
4602                          * we do.
4603                          */
4604                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4605                         if ((ptype & 0x4000) == 0x4000) {
4606                                 /* Report bit is set?? */
4607                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4608                                 if (op_err == NULL) {
4609                                         int l_len;
4610
4611                                         /* Ok need to try to get an mbuf */
4612 #ifdef INET6
4613                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4614 #else
4615                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4616 #endif
4617                                         l_len += plen;
4618                                         l_len += sizeof(struct sctp_paramhdr);
4619                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4620                                         if (op_err) {
4621                                                 SCTP_BUF_LEN(op_err) = 0;
4622 #ifdef INET6
4623                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4624 #else
4625                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4626 #endif
4627                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4628                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4629                                         }
4630                                 }
4631                                 if (op_err) {
4632                                         /* If we have space */
4633                                         struct sctp_paramhdr s;
4634
4635                                         if (err_at % 4) {
4636                                                 uint32_t cpthis = 0;
4637
4638                                                 pad_needed = 4 - (err_at % 4);
4639                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4640                                                 err_at += pad_needed;
4641                                         }
4642                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4643                                         s.param_length = htons(sizeof(s) + plen);
4644                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4645                                         err_at += sizeof(s);
4646                                         if (plen > sizeof(tempbuf)) {
4647                                                 plen = sizeof(tempbuf);
4648                                         }
4649                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4650                                         if (phdr == NULL) {
4651                                                 sctp_m_freem(op_err);
4652                                                 /*
4653                                                  * we are out of memory but
4654                                                  * we still need to have a
4655                                                  * look at what to do (the
4656                                                  * system is in trouble
4657                                                  * though).
4658                                                  */
4659                                                 op_err = NULL;
4660                                                 goto more_processing;
4661                                         }
4662                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4663                                         err_at += plen;
4664                                 }
4665                         }
4666         more_processing:
4667                         if ((ptype & 0x8000) == 0x0000) {
4668                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4669                                 return (op_err);
4670                         } else {
4671                                 /* skip this chunk and continue processing */
4672                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4673                                 at += SCTP_SIZE32(plen);
4674                         }
4675                         break;
4676
4677                 }
4678                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4679         }
4680         return (op_err);
4681 invalid_size:
4682         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4683         *abort_processing = 1;
4684         if ((op_err == NULL) && phdr) {
4685                 int l_len;
4686
4687 #ifdef INET6
4688                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4689 #else
4690                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4691 #endif
4692                 l_len += (2 * sizeof(struct sctp_paramhdr));
4693                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4694                 if (op_err) {
4695                         SCTP_BUF_LEN(op_err) = 0;
4696 #ifdef INET6
4697                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4698 #else
4699                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4700 #endif
4701                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4702                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4703                 }
4704         }
4705         if ((op_err) && phdr) {
4706                 struct sctp_paramhdr s;
4707
4708                 if (err_at % 4) {
4709                         uint32_t cpthis = 0;
4710
4711                         pad_needed = 4 - (err_at % 4);
4712                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4713                         err_at += pad_needed;
4714                 }
4715                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4716                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4717                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4718                 err_at += sizeof(s);
4719                 /* Only copy back the p-hdr that caused the issue */
4720                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4721         }
4722         return (op_err);
4723 }
4724
4725 static int
4726 sctp_are_there_new_addresses(struct sctp_association *asoc,
4727     struct mbuf *in_initpkt, int iphlen, int offset)
4728 {
4729         /*
4730          * Given a INIT packet, look through the packet to verify that there
4731          * are NO new addresses. As we go through the parameters add reports
4732          * of any un-understood parameters that require an error.  Also we
4733          * must return (1) to drop the packet if we see a un-understood
4734          * parameter that tells us to drop the chunk.
4735          */
4736         struct sockaddr_in sin4, *sa4;
4737
4738 #ifdef INET6
4739         struct sockaddr_in6 sin6, *sa6;
4740
4741 #endif
4742         struct sockaddr *sa_touse;
4743         struct sockaddr *sa;
4744         struct sctp_paramhdr *phdr, params;
4745         struct ip *iph;
4746
4747 #ifdef INET6
4748         struct ip6_hdr *ip6h;
4749
4750 #endif
4751         struct mbuf *mat;
4752         uint16_t ptype, plen;
4753         int err_at;
4754         uint8_t fnd;
4755         struct sctp_nets *net;
4756
4757         memset(&sin4, 0, sizeof(sin4));
4758 #ifdef INET6
4759         memset(&sin6, 0, sizeof(sin6));
4760 #endif
4761         sin4.sin_family = AF_INET;
4762         sin4.sin_len = sizeof(sin4);
4763 #ifdef INET6
4764         sin6.sin6_family = AF_INET6;
4765         sin6.sin6_len = sizeof(sin6);
4766 #endif
4767         sa_touse = NULL;
4768         /* First what about the src address of the pkt ? */
4769         iph = mtod(in_initpkt, struct ip *);
4770         switch (iph->ip_v) {
4771         case IPVERSION:
4772                 /* source addr is IPv4 */
4773                 sin4.sin_addr = iph->ip_src;
4774                 sa_touse = (struct sockaddr *)&sin4;
4775                 break;
4776 #ifdef INET6
4777         case IPV6_VERSION >> 4:
4778                 /* source addr is IPv6 */
4779                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4780                 sin6.sin6_addr = ip6h->ip6_src;
4781                 sa_touse = (struct sockaddr *)&sin6;
4782                 break;
4783 #endif
4784         default:
4785                 return (1);
4786         }
4787
4788         fnd = 0;
4789         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4790                 sa = (struct sockaddr *)&net->ro._l_addr;
4791                 if (sa->sa_family == sa_touse->sa_family) {
4792                         if (sa->sa_family == AF_INET) {
4793                                 sa4 = (struct sockaddr_in *)sa;
4794                                 if (sa4->sin_addr.s_addr ==
4795                                     sin4.sin_addr.s_addr) {
4796                                         fnd = 1;
4797                                         break;
4798                                 }
4799                         }
4800 #ifdef INET6
4801                         if (sa->sa_family == AF_INET6) {
4802                                 sa6 = (struct sockaddr_in6 *)sa;
4803                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4804                                     &sin6)) {
4805                                         fnd = 1;
4806                                         break;
4807                                 }
4808                         }
4809 #endif
4810                 }
4811         }
4812         if (fnd == 0) {
4813                 /* New address added! no need to look futher. */
4814                 return (1);
4815         }
4816         /* Ok so far lets munge through the rest of the packet */
4817         mat = in_initpkt;
4818         err_at = 0;
4819         sa_touse = NULL;
4820         offset += sizeof(struct sctp_init_chunk);
4821         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4822         while (phdr) {
4823                 ptype = ntohs(phdr->param_type);
4824                 plen = ntohs(phdr->param_length);
4825                 if (ptype == SCTP_IPV4_ADDRESS) {
4826                         struct sctp_ipv4addr_param *p4, p4_buf;
4827
4828                         phdr = sctp_get_next_param(mat, offset,
4829                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4830                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4831                             phdr == NULL) {
4832                                 return (1);
4833                         }
4834                         p4 = (struct sctp_ipv4addr_param *)phdr;
4835                         sin4.sin_addr.s_addr = p4->addr;
4836                         sa_touse = (struct sockaddr *)&sin4;
4837                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4838                         struct sctp_ipv6addr_param *p6, p6_buf;
4839
4840                         phdr = sctp_get_next_param(mat, offset,
4841                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4842                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4843                             phdr == NULL) {
4844                                 return (1);
4845                         }
4846                         p6 = (struct sctp_ipv6addr_param *)phdr;
4847 #ifdef INET6
4848                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4849                             sizeof(p6->addr));
4850 #endif
4851                         sa_touse = (struct sockaddr *)&sin4;
4852                 }
4853                 if (sa_touse) {
4854                         /* ok, sa_touse points to one to check */
4855                         fnd = 0;
4856                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4857                                 sa = (struct sockaddr *)&net->ro._l_addr;
4858                                 if (sa->sa_family != sa_touse->sa_family) {
4859                                         continue;
4860                                 }
4861                                 if (sa->sa_family == AF_INET) {
4862                                         sa4 = (struct sockaddr_in *)sa;
4863                                         if (sa4->sin_addr.s_addr ==
4864                                             sin4.sin_addr.s_addr) {
4865                                                 fnd = 1;
4866                                                 break;
4867                                         }
4868                                 }
4869 #ifdef INET6
4870                                 if (sa->sa_family == AF_INET6) {
4871                                         sa6 = (struct sockaddr_in6 *)sa;
4872                                         if (SCTP6_ARE_ADDR_EQUAL(
4873                                             sa6, &sin6)) {
4874                                                 fnd = 1;
4875                                                 break;
4876                                         }
4877                                 }
4878 #endif
4879                         }
4880                         if (!fnd) {
4881                                 /* New addr added! no need to look further */
4882                                 return (1);
4883                         }
4884                 }
4885                 offset += SCTP_SIZE32(plen);
4886                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4887         }
4888         return (0);
4889 }
4890
4891 /*
4892  * Given a MBUF chain that was sent into us containing an INIT. Build a
4893  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4894  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4895  * message (i.e. the struct sctp_init_msg).
4896  */
4897 void
4898 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4899     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4900     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4901 {
4902         struct sctp_association *asoc;
4903         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4904         struct sctp_init_ack_chunk *initack;
4905         struct sctp_adaptation_layer_indication *ali;
4906         struct sctp_ecn_supported_param *ecn;
4907         struct sctp_prsctp_supported_param *prsctp;
4908         struct sctp_supported_chunk_types_param *pr_supported;
4909         union sctp_sockstore store, store1, *over_addr;
4910         struct sockaddr_in *sin, *to_sin;
4911
4912 #ifdef INET6
4913         struct sockaddr_in6 *sin6, *to_sin6;
4914
4915 #endif
4916         struct ip *iph;
4917
4918 #ifdef INET6
4919         struct ip6_hdr *ip6;
4920
4921 #endif
4922         struct sockaddr *to;
4923         struct sctp_state_cookie stc;
4924         struct sctp_nets *net = NULL;
4925         uint8_t *signature = NULL;
4926         int cnt_inits_to = 0;
4927         uint16_t his_limit, i_want;
4928         int abort_flag, padval;
4929         int num_ext;
4930         int p_len;
4931         int nat_friendly = 0;
4932         struct socket *so;
4933
4934         if (stcb)
4935                 asoc = &stcb->asoc;
4936         else
4937                 asoc = NULL;
4938         mp_last = NULL;
4939         if ((asoc != NULL) &&
4940             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4941             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4942                 /* new addresses, out of here in non-cookie-wait states */
4943                 /*
4944                  * Send a ABORT, we don't add the new address error clause
4945                  * though we even set the T bit and copy in the 0 tag.. this
4946                  * looks no different than if no listener was present.
4947                  */
4948                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4949                 return;
4950         }
4951         abort_flag = 0;
4952         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4953             (offset + sizeof(struct sctp_init_chunk)),
4954             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4955         if (abort_flag) {
4956 do_a_abort:
4957                 sctp_send_abort(init_pkt, iphlen, sh,
4958                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4959                 return;
4960         }
4961         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4962         if (m == NULL) {
4963                 /* No memory, INIT timer will re-attempt. */
4964                 if (op_err)
4965                         sctp_m_freem(op_err);
4966                 return;
4967         }
4968         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4969
4970         /* the time I built cookie */
4971         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4972
4973         /* populate any tie tags */
4974         if (asoc != NULL) {
4975                 /* unlock before tag selections */
4976                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4977                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4978                 stc.cookie_life = asoc->cookie_life;
4979                 net = asoc->primary_destination;
4980         } else {
4981                 stc.tie_tag_my_vtag = 0;
4982                 stc.tie_tag_peer_vtag = 0;
4983                 /* life I will award this cookie */
4984                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
4985         }
4986
4987         /* copy in the ports for later check */
4988         stc.myport = sh->dest_port;
4989         stc.peerport = sh->src_port;
4990
4991         /*
4992          * If we wanted to honor cookie life extentions, we would add to
4993          * stc.cookie_life. For now we should NOT honor any extension
4994          */
4995         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
4996         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
4997                 struct inpcb *in_inp;
4998
4999                 /* Its a V6 socket */
5000                 in_inp = (struct inpcb *)inp;
5001                 stc.ipv6_addr_legal = 1;
5002                 /* Now look at the binding flag to see if V4 will be legal */
5003                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5004                         stc.ipv4_addr_legal = 1;
5005                 } else {
5006                         /* V4 addresses are NOT legal on the association */
5007                         stc.ipv4_addr_legal = 0;
5008                 }
5009         } else {
5010                 /* Its a V4 socket, no - V6 */
5011                 stc.ipv4_addr_legal = 1;
5012                 stc.ipv6_addr_legal = 0;
5013         }
5014
5015 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5016         stc.ipv4_scope = 1;
5017 #else
5018         stc.ipv4_scope = 0;
5019 #endif
5020         /* now for scope setup */
5021         memset((caddr_t)&store, 0, sizeof(store));
5022         memset((caddr_t)&store1, 0, sizeof(store1));
5023         sin = &store.sin;
5024         to_sin = &store1.sin;
5025 #ifdef INET6
5026         sin6 = &store.sin6;
5027         to_sin6 = &store1.sin6;
5028 #endif
5029         iph = mtod(init_pkt, struct ip *);
5030         /* establish the to_addr's */
5031         switch (iph->ip_v) {
5032         case IPVERSION:
5033                 to_sin->sin_port = sh->dest_port;
5034                 to_sin->sin_family = AF_INET;
5035                 to_sin->sin_len = sizeof(struct sockaddr_in);
5036                 to_sin->sin_addr = iph->ip_dst;
5037                 break;
5038 #ifdef INET6
5039         case IPV6_VERSION >> 4:
5040                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5041                 to_sin6->sin6_addr = ip6->ip6_dst;
5042                 to_sin6->sin6_scope_id = 0;
5043                 to_sin6->sin6_port = sh->dest_port;
5044                 to_sin6->sin6_family = AF_INET6;
5045                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5046                 break;
5047 #endif
5048         default:
5049                 goto do_a_abort;
5050                 break;
5051         };
5052
5053         if (net == NULL) {
5054                 to = (struct sockaddr *)&store;
5055                 switch (iph->ip_v) {
5056                 case IPVERSION:
5057                         {
5058                                 sin->sin_family = AF_INET;
5059                                 sin->sin_len = sizeof(struct sockaddr_in);
5060                                 sin->sin_port = sh->src_port;
5061                                 sin->sin_addr = iph->ip_src;
5062                                 /* lookup address */
5063                                 stc.address[0] = sin->sin_addr.s_addr;
5064                                 stc.address[1] = 0;
5065                                 stc.address[2] = 0;
5066                                 stc.address[3] = 0;
5067                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5068                                 /* local from address */
5069                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5070                                 stc.laddress[1] = 0;
5071                                 stc.laddress[2] = 0;
5072                                 stc.laddress[3] = 0;
5073                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5074                                 /* scope_id is only for v6 */
5075                                 stc.scope_id = 0;
5076 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5077                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5078                                         stc.ipv4_scope = 1;
5079                                 }
5080 #else
5081                                 stc.ipv4_scope = 1;
5082 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5083                                 /* Must use the address in this case */
5084                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5085                                         stc.loopback_scope = 1;
5086                                         stc.ipv4_scope = 1;
5087                                         stc.site_scope = 1;
5088                                         stc.local_scope = 0;
5089                                 }
5090                                 break;
5091                         }
5092 #ifdef INET6
5093                 case IPV6_VERSION >> 4:
5094                         {
5095                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5096                                 sin6->sin6_family = AF_INET6;
5097                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5098                                 sin6->sin6_port = sh->src_port;
5099                                 sin6->sin6_addr = ip6->ip6_src;
5100                                 /* lookup address */
5101                                 memcpy(&stc.address, &sin6->sin6_addr,
5102                                     sizeof(struct in6_addr));
5103                                 sin6->sin6_scope_id = 0;
5104                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5105                                 stc.scope_id = 0;
5106                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5107                                         /*
5108                                          * FIX ME: does this have scope from
5109                                          * rcvif?
5110                                          */
5111                                         (void)sa6_recoverscope(sin6);
5112                                         stc.scope_id = sin6->sin6_scope_id;
5113                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5114                                         stc.loopback_scope = 1;
5115                                         stc.local_scope = 0;
5116                                         stc.site_scope = 1;
5117                                         stc.ipv4_scope = 1;
5118                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5119                                         /*
5120                                          * If the new destination is a
5121                                          * LINK_LOCAL we must have common
5122                                          * both site and local scope. Don't
5123                                          * set local scope though since we
5124                                          * must depend on the source to be
5125                                          * added implicitly. We cannot
5126                                          * assure just because we share one
5127                                          * link that all links are common.
5128                                          */
5129                                         stc.local_scope = 0;
5130                                         stc.site_scope = 1;
5131                                         stc.ipv4_scope = 1;
5132                                         /*
5133                                          * we start counting for the private
5134                                          * address stuff at 1. since the
5135                                          * link local we source from won't
5136                                          * show up in our scoped count.
5137                                          */
5138                                         cnt_inits_to = 1;
5139                                         /*
5140                                          * pull out the scope_id from
5141                                          * incoming pkt
5142                                          */
5143                                         /*
5144                                          * FIX ME: does this have scope from
5145                                          * rcvif?
5146                                          */
5147                                         (void)sa6_recoverscope(sin6);
5148                                         stc.scope_id = sin6->sin6_scope_id;
5149                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5150                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5151                                         /*
5152                                          * If the new destination is
5153                                          * SITE_LOCAL then we must have site
5154                                          * scope in common.
5155                                          */
5156                                         stc.site_scope = 1;
5157                                 }
5158                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5159                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5160                                 break;
5161                         }
5162 #endif
5163                 default:
5164                         /* TSNH */
5165                         goto do_a_abort;
5166                         break;
5167                 }
5168         } else {
5169                 /* set the scope per the existing tcb */
5170
5171 #ifdef INET6
5172                 struct sctp_nets *lnet;
5173
5174 #endif
5175
5176                 stc.loopback_scope = asoc->loopback_scope;
5177                 stc.ipv4_scope = asoc->ipv4_local_scope;
5178                 stc.site_scope = asoc->site_scope;
5179                 stc.local_scope = asoc->local_scope;
5180 #ifdef INET6
5181                 /* Why do we not consider IPv4 LL addresses? */
5182                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5183                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5184                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5185                                         /*
5186                                          * if we have a LL address, start
5187                                          * counting at 1.
5188                                          */
5189                                         cnt_inits_to = 1;
5190                                 }
5191                         }
5192                 }
5193 #endif
5194                 /* use the net pointer */
5195                 to = (struct sockaddr *)&net->ro._l_addr;
5196                 switch (to->sa_family) {
5197                 case AF_INET:
5198                         sin = (struct sockaddr_in *)to;
5199                         stc.address[0] = sin->sin_addr.s_addr;
5200                         stc.address[1] = 0;
5201                         stc.address[2] = 0;
5202                         stc.address[3] = 0;
5203                         stc.addr_type = SCTP_IPV4_ADDRESS;
5204                         if (net->src_addr_selected == 0) {
5205                                 /*
5206                                  * strange case here, the INIT should have
5207                                  * did the selection.
5208                                  */
5209                                 net->ro._s_addr = sctp_source_address_selection(inp,
5210                                     stcb, (sctp_route_t *) & net->ro,
5211                                     net, 0, vrf_id);
5212                                 if (net->ro._s_addr == NULL)
5213                                         return;
5214
5215                                 net->src_addr_selected = 1;
5216
5217                         }
5218                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5219                         stc.laddress[1] = 0;
5220                         stc.laddress[2] = 0;
5221                         stc.laddress[3] = 0;
5222                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5223                         break;
5224 #ifdef INET6
5225                 case AF_INET6:
5226                         sin6 = (struct sockaddr_in6 *)to;
5227                         memcpy(&stc.address, &sin6->sin6_addr,
5228                             sizeof(struct in6_addr));
5229                         stc.addr_type = SCTP_IPV6_ADDRESS;
5230                         if (net->src_addr_selected == 0) {
5231                                 /*
5232                                  * strange case here, the INIT should have
5233                                  * did the selection.
5234                                  */
5235                                 net->ro._s_addr = sctp_source_address_selection(inp,
5236                                     stcb, (sctp_route_t *) & net->ro,
5237                                     net, 0, vrf_id);
5238                                 if (net->ro._s_addr == NULL)
5239                                         return;
5240
5241                                 net->src_addr_selected = 1;
5242                         }
5243                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5244                             sizeof(struct in6_addr));
5245                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5246                         break;
5247 #endif
5248                 }
5249         }
5250         /* Now lets put the SCTP header in place */
5251         initack = mtod(m, struct sctp_init_ack_chunk *);
5252         /* Save it off for quick ref */
5253         stc.peers_vtag = init_chk->init.initiate_tag;
5254         /* who are we */
5255         memcpy(stc.identification, SCTP_VERSION_STRING,
5256             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5257         /* now the chunk header */
5258         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5259         initack->ch.chunk_flags = 0;
5260         /* fill in later from mbuf we build */
5261         initack->ch.chunk_length = 0;
5262         /* place in my tag */
5263         if ((asoc != NULL) &&
5264             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5265             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5266             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5267                 /* re-use the v-tags and init-seq here */
5268                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5269                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5270         } else {
5271                 uint32_t vtag, itsn;
5272
5273                 if (hold_inp_lock) {
5274                         SCTP_INP_INCR_REF(inp);
5275                         SCTP_INP_RUNLOCK(inp);
5276                 }
5277                 if (asoc) {
5278                         atomic_add_int(&asoc->refcnt, 1);
5279                         SCTP_TCB_UNLOCK(stcb);
5280         new_tag:
5281                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5282                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5283                                 /*
5284                                  * Got a duplicate vtag on some guy behind a
5285                                  * nat make sure we don't use it.
5286                                  */
5287                                 goto new_tag;
5288                         }
5289                         initack->init.initiate_tag = htonl(vtag);
5290                         /* get a TSN to use too */
5291                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5292                         initack->init.initial_tsn = htonl(itsn);
5293                         SCTP_TCB_LOCK(stcb);
5294                         atomic_add_int(&asoc->refcnt, -1);
5295                 } else {
5296                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5297                         initack->init.initiate_tag = htonl(vtag);
5298                         /* get a TSN to use too */
5299                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5300                 }
5301                 if (hold_inp_lock) {
5302                         SCTP_INP_RLOCK(inp);
5303                         SCTP_INP_DECR_REF(inp);
5304                 }
5305         }
5306         /* save away my tag to */
5307         stc.my_vtag = initack->init.initiate_tag;
5308
5309         /* set up some of the credits. */
5310         so = inp->sctp_socket;
5311         if (so == NULL) {
5312                 /* memory problem */
5313                 sctp_m_freem(m);
5314                 return;
5315         } else {
5316                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5317         }
5318         /* set what I want */
5319         his_limit = ntohs(init_chk->init.num_inbound_streams);
5320         /* choose what I want */
5321         if (asoc != NULL) {
5322                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5323                         i_want = asoc->streamoutcnt;
5324                 } else {
5325                         i_want = inp->sctp_ep.pre_open_stream_count;
5326                 }
5327         } else {
5328                 i_want = inp->sctp_ep.pre_open_stream_count;
5329         }
5330         if (his_limit < i_want) {
5331                 /* I Want more :< */
5332                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5333         } else {
5334                 /* I can have what I want :> */
5335                 initack->init.num_outbound_streams = htons(i_want);
5336         }
5337         /* tell him his limt. */
5338         initack->init.num_inbound_streams =
5339             htons(inp->sctp_ep.max_open_streams_intome);
5340
5341         /* adaptation layer indication parameter */
5342         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5343         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5344         ali->ph.param_length = htons(sizeof(*ali));
5345         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5346         SCTP_BUF_LEN(m) += sizeof(*ali);
5347         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5348
5349         /* ECN parameter */
5350         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5351                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5352                 ecn->ph.param_length = htons(sizeof(*ecn));
5353                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5354
5355                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5356                     sizeof(*ecn));
5357         } else {
5358                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5359         }
5360         /* And now tell the peer we do  pr-sctp */
5361         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5362         prsctp->ph.param_length = htons(sizeof(*prsctp));
5363         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5364         if (nat_friendly) {
5365                 /* Add NAT friendly parameter */
5366                 struct sctp_paramhdr *ph;
5367
5368                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5369                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5370                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5371                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5372         }
5373         /* And now tell the peer we do all the extensions */
5374         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5375         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5376         num_ext = 0;
5377         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5378         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5379         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5380         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5381         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5382         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5383                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5384         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5385                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5386         p_len = sizeof(*pr_supported) + num_ext;
5387         pr_supported->ph.param_length = htons(p_len);
5388         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5389         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5390
5391         /* add authentication parameters */
5392         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5393                 struct sctp_auth_random *randp;
5394                 struct sctp_auth_hmac_algo *hmacs;
5395                 struct sctp_auth_chunk_list *chunks;
5396                 uint16_t random_len;
5397
5398                 /* generate and add RANDOM parameter */
5399                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5400                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5401                 randp->ph.param_type = htons(SCTP_RANDOM);
5402                 p_len = sizeof(*randp) + random_len;
5403                 randp->ph.param_length = htons(p_len);
5404                 SCTP_READ_RANDOM(randp->random_data, random_len);
5405                 /* zero out any padding required */
5406                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5407                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5408
5409                 /* add HMAC_ALGO parameter */
5410                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5411                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5412                     (uint8_t *) hmacs->hmac_ids);
5413                 if (p_len > 0) {
5414                         p_len += sizeof(*hmacs);
5415                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5416                         hmacs->ph.param_length = htons(p_len);
5417                         /* zero out any padding required */
5418                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5419                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5420                 }
5421                 /* add CHUNKS parameter */
5422                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5423                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5424                     chunks->chunk_types);
5425                 if (p_len > 0) {
5426                         p_len += sizeof(*chunks);
5427                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5428                         chunks->ph.param_length = htons(p_len);
5429                         /* zero out any padding required */
5430                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5431                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5432                 }
5433         }
5434         m_at = m;
5435         /* now the addresses */
5436         {
5437                 struct sctp_scoping scp;
5438
5439                 /*
5440                  * To optimize this we could put the scoping stuff into a
5441                  * structure and remove the individual uint8's from the stc
5442                  * structure. Then we could just sifa in the address within
5443                  * the stc.. but for now this is a quick hack to get the
5444                  * address stuff teased apart.
5445                  */
5446                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5447                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5448                 scp.loopback_scope = stc.loopback_scope;
5449                 scp.ipv4_local_scope = stc.ipv4_scope;
5450                 scp.local_scope = stc.local_scope;
5451                 scp.site_scope = stc.site_scope;
5452                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5453         }
5454
5455         /* tack on the operational error if present */
5456         if (op_err) {
5457                 struct mbuf *ol;
5458                 int llen;
5459
5460                 llen = 0;
5461                 ol = op_err;
5462                 while (ol) {
5463                         llen += SCTP_BUF_LEN(ol);
5464                         ol = SCTP_BUF_NEXT(ol);
5465                 }
5466                 if (llen % 4) {
5467                         /* must add a pad to the param */
5468                         uint32_t cpthis = 0;
5469                         int padlen;
5470
5471                         padlen = 4 - (llen % 4);
5472                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5473                 }
5474                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5475                         m_at = SCTP_BUF_NEXT(m_at);
5476                 }
5477                 SCTP_BUF_NEXT(m_at) = op_err;
5478                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5479                         m_at = SCTP_BUF_NEXT(m_at);
5480                 }
5481         }
5482         /* pre-calulate the size and update pkt header and chunk header */
5483         p_len = 0;
5484         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5485                 p_len += SCTP_BUF_LEN(m_tmp);
5486                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5487                         /* m_tmp should now point to last one */
5488                         break;
5489                 }
5490         }
5491
5492         /* Now we must build a cookie */
5493         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5494         if (m_cookie == NULL) {
5495                 /* memory problem */
5496                 sctp_m_freem(m);
5497                 return;
5498         }
5499         /* Now append the cookie to the end and update the space/size */
5500         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5501
5502         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5503                 p_len += SCTP_BUF_LEN(m_tmp);
5504                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5505                         /* m_tmp should now point to last one */
5506                         mp_last = m_tmp;
5507                         break;
5508                 }
5509         }
5510         /*
5511          * Place in the size, but we don't include the last pad (if any) in
5512          * the INIT-ACK.
5513          */
5514         initack->ch.chunk_length = htons(p_len);
5515
5516         /*
5517          * Time to sign the cookie, we don't sign over the cookie signature
5518          * though thus we set trailer.
5519          */
5520         (void)sctp_hmac_m(SCTP_HMAC,
5521             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5522             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5523             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5524         /*
5525          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5526          * here since the timer will drive a retranmission.
5527          */
5528         padval = p_len % 4;
5529         if ((padval) && (mp_last)) {
5530                 /* see my previous comments on mp_last */
5531                 int ret;
5532
5533                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5534                 if (ret) {
5535                         /* Houston we have a problem, no space */
5536                         sctp_m_freem(m);
5537                         return;
5538                 }
5539                 p_len += padval;
5540         }
5541         if (stc.loopback_scope) {
5542                 over_addr = &store1;
5543         } else {
5544                 over_addr = NULL;
5545         }
5546
5547         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5548             0, NULL, 0,
5549             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5550             port, SCTP_SO_NOT_LOCKED, over_addr);
5551         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5552 }
5553
5554
5555 static void
5556 sctp_prune_prsctp(struct sctp_tcb *stcb,
5557     struct sctp_association *asoc,
5558     struct sctp_sndrcvinfo *srcv,
5559     int dataout)
5560 {
5561         int freed_spc = 0;
5562         struct sctp_tmit_chunk *chk, *nchk;
5563
5564         SCTP_TCB_LOCK_ASSERT(stcb);
5565         if ((asoc->peer_supports_prsctp) &&
5566             (asoc->sent_queue_cnt_removeable > 0)) {
5567                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5568                         /*
5569                          * Look for chunks marked with the PR_SCTP flag AND
5570                          * the buffer space flag. If the one being sent is
5571                          * equal or greater priority then purge the old one
5572                          * and free some space.
5573                          */
5574                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5575                                 /*
5576                                  * This one is PR-SCTP AND buffer space
5577                                  * limited type
5578                                  */
5579                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5580                                         /*
5581                                          * Lower numbers equates to higher
5582                                          * priority so if the one we are
5583                                          * looking at has a larger or equal
5584                                          * priority we want to drop the data
5585                                          * and NOT retransmit it.
5586                                          */
5587                                         if (chk->data) {
5588                                                 /*
5589                                                  * We release the book_size
5590                                                  * if the mbuf is here
5591                                                  */
5592                                                 int ret_spc;
5593                                                 int cause;
5594
5595                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5596                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5597                                                 else
5598                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5599                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5600                                                     cause,
5601                                                     SCTP_SO_LOCKED);
5602                                                 freed_spc += ret_spc;
5603                                                 if (freed_spc >= dataout) {
5604                                                         return;
5605                                                 }
5606                                         }       /* if chunk was present */
5607                                 }       /* if of sufficent priority */
5608                         }       /* if chunk has enabled */
5609                 }               /* tailqforeach */
5610
5611                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
5612                         /* Here we must move to the sent queue and mark */
5613                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5614                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5615                                         if (chk->data) {
5616                                                 /*
5617                                                  * We release the book_size
5618                                                  * if the mbuf is here
5619                                                  */
5620                                                 int ret_spc;
5621
5622                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5623                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5624                                                     SCTP_SO_LOCKED);
5625
5626                                                 freed_spc += ret_spc;
5627                                                 if (freed_spc >= dataout) {
5628                                                         return;
5629                                                 }
5630                                         }       /* end if chk->data */
5631                                 }       /* end if right class */
5632                         }       /* end if chk pr-sctp */
5633                 }               /* tailqforeachsafe (chk) */
5634         }                       /* if enabled in asoc */
5635 }
5636
5637 int
5638 sctp_get_frag_point(struct sctp_tcb *stcb,
5639     struct sctp_association *asoc)
5640 {
5641         int siz, ovh;
5642
5643         /*
5644          * For endpoints that have both v6 and v4 addresses we must reserve
5645          * room for the ipv6 header, for those that are only dealing with V4
5646          * we use a larger frag point.
5647          */
5648         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5649                 ovh = SCTP_MED_OVERHEAD;
5650         } else {
5651                 ovh = SCTP_MED_V4_OVERHEAD;
5652         }
5653
5654         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5655                 siz = asoc->smallest_mtu - ovh;
5656         else
5657                 siz = (stcb->asoc.sctp_frag_point - ovh);
5658         /*
5659          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5660          */
5661         /* A data chunk MUST fit in a cluster */
5662         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5663         /* } */
5664
5665         /* adjust for an AUTH chunk if DATA requires auth */
5666         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5667                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5668
5669         if (siz % 4) {
5670                 /* make it an even word boundary please */
5671                 siz -= (siz % 4);
5672         }
5673         return (siz);
5674 }
5675
5676 static void
5677 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5678 {
5679         sp->pr_sctp_on = 0;
5680         /*
5681          * We assume that the user wants PR_SCTP_TTL if the user provides a
5682          * positive lifetime but does not specify any PR_SCTP policy. This
5683          * is a BAD assumption and causes problems at least with the
5684          * U-Vancovers MPI folks. I will change this to be no policy means
5685          * NO PR-SCTP.
5686          */
5687         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5688                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5689                 sp->pr_sctp_on = 1;
5690         } else {
5691                 return;
5692         }
5693         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5694         case CHUNK_FLAGS_PR_SCTP_BUF:
5695                 /*
5696                  * Time to live is a priority stored in tv_sec when doing
5697                  * the buffer drop thing.
5698                  */
5699                 sp->ts.tv_sec = sp->timetolive;
5700                 sp->ts.tv_usec = 0;
5701                 break;
5702         case CHUNK_FLAGS_PR_SCTP_TTL:
5703                 {
5704                         struct timeval tv;
5705
5706                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5707                         tv.tv_sec = sp->timetolive / 1000;
5708                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5709                         /*
5710                          * TODO sctp_constants.h needs alternative time
5711                          * macros when _KERNEL is undefined.
5712                          */
5713                         timevaladd(&sp->ts, &tv);
5714                 }
5715                 break;
5716         case CHUNK_FLAGS_PR_SCTP_RTX:
5717                 /*
5718                  * Time to live is a the number or retransmissions stored in
5719                  * tv_sec.
5720                  */
5721                 sp->ts.tv_sec = sp->timetolive;
5722                 sp->ts.tv_usec = 0;
5723                 break;
5724         default:
5725                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5726                     "Unknown PR_SCTP policy %u.\n",
5727                     PR_SCTP_POLICY(sp->sinfo_flags));
5728                 break;
5729         }
5730 }
5731
5732 static int
5733 sctp_msg_append(struct sctp_tcb *stcb,
5734     struct sctp_nets *net,
5735     struct mbuf *m,
5736     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5737 {
5738         int error = 0, holds_lock;
5739         struct mbuf *at;
5740         struct sctp_stream_queue_pending *sp = NULL;
5741         struct sctp_stream_out *strm;
5742
5743         /*
5744          * Given an mbuf chain, put it into the association send queue and
5745          * place it on the wheel
5746          */
5747         holds_lock = hold_stcb_lock;
5748         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5749                 /* Invalid stream number */
5750                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5751                 error = EINVAL;
5752                 goto out_now;
5753         }
5754         if ((stcb->asoc.stream_locked) &&
5755             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5756                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5757                 error = EINVAL;
5758                 goto out_now;
5759         }
5760         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5761         /* Now can we send this? */
5762         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5763             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5764             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5765             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5766                 /* got data while shutting down */
5767                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5768                 error = ECONNRESET;
5769                 goto out_now;
5770         }
5771         sctp_alloc_a_strmoq(stcb, sp);
5772         if (sp == NULL) {
5773                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5774                 error = ENOMEM;
5775                 goto out_now;
5776         }
5777         sp->sinfo_flags = srcv->sinfo_flags;
5778         sp->timetolive = srcv->sinfo_timetolive;
5779         sp->ppid = srcv->sinfo_ppid;
5780         sp->context = srcv->sinfo_context;
5781         sp->strseq = 0;
5782         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5783                 sp->net = net;
5784                 atomic_add_int(&sp->net->ref_count, 1);
5785         } else {
5786                 sp->net = NULL;
5787         }
5788         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5789         sp->stream = srcv->sinfo_stream;
5790         sp->msg_is_complete = 1;
5791         sp->sender_all_done = 1;
5792         sp->some_taken = 0;
5793         sp->data = m;
5794         sp->tail_mbuf = NULL;
5795         sp->length = 0;
5796         at = m;
5797         sctp_set_prsctp_policy(sp);
5798         /*
5799          * We could in theory (for sendall) sifa the length in, but we would
5800          * still have to hunt through the chain since we need to setup the
5801          * tail_mbuf
5802          */
5803         while (at) {
5804                 if (SCTP_BUF_NEXT(at) == NULL)
5805                         sp->tail_mbuf = at;
5806                 sp->length += SCTP_BUF_LEN(at);
5807                 at = SCTP_BUF_NEXT(at);
5808         }
5809         SCTP_TCB_SEND_LOCK(stcb);
5810         sctp_snd_sb_alloc(stcb, sp->length);
5811         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5812         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5813         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5814                 sp->strseq = strm->next_sequence_sent;
5815                 strm->next_sequence_sent++;
5816         }
5817         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
5818         m = NULL;
5819         SCTP_TCB_SEND_UNLOCK(stcb);
5820 out_now:
5821         if (m) {
5822                 sctp_m_freem(m);
5823         }
5824         return (error);
5825 }
5826
5827
5828 static struct mbuf *
5829 sctp_copy_mbufchain(struct mbuf *clonechain,
5830     struct mbuf *outchain,
5831     struct mbuf **endofchain,
5832     int can_take_mbuf,
5833     int sizeofcpy,
5834     uint8_t copy_by_ref)
5835 {
5836         struct mbuf *m;
5837         struct mbuf *appendchain;
5838         caddr_t cp;
5839         int len;
5840
5841         if (endofchain == NULL) {
5842                 /* error */
5843 error_out:
5844                 if (outchain)
5845                         sctp_m_freem(outchain);
5846                 return (NULL);
5847         }
5848         if (can_take_mbuf) {
5849                 appendchain = clonechain;
5850         } else {
5851                 if (!copy_by_ref &&
5852                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5853                     ) {
5854                         /* Its not in a cluster */
5855                         if (*endofchain == NULL) {
5856                                 /* lets get a mbuf cluster */
5857                                 if (outchain == NULL) {
5858                                         /* This is the general case */
5859                         new_mbuf:
5860                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5861                                         if (outchain == NULL) {
5862                                                 goto error_out;
5863                                         }
5864                                         SCTP_BUF_LEN(outchain) = 0;
5865                                         *endofchain = outchain;
5866                                         /* get the prepend space */
5867                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5868                                 } else {
5869                                         /*
5870                                          * We really should not get a NULL
5871                                          * in endofchain
5872                                          */
5873                                         /* find end */
5874                                         m = outchain;
5875                                         while (m) {
5876                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5877                                                         *endofchain = m;
5878                                                         break;
5879                                                 }
5880                                                 m = SCTP_BUF_NEXT(m);
5881                                         }
5882                                         /* sanity */
5883                                         if (*endofchain == NULL) {
5884                                                 /*
5885                                                  * huh, TSNH XXX maybe we
5886                                                  * should panic
5887                                                  */
5888                                                 sctp_m_freem(outchain);
5889                                                 goto new_mbuf;
5890                                         }
5891                                 }
5892                                 /* get the new end of length */
5893                                 len = M_TRAILINGSPACE(*endofchain);
5894                         } else {
5895                                 /* how much is left at the end? */
5896                                 len = M_TRAILINGSPACE(*endofchain);
5897                         }
5898                         /* Find the end of the data, for appending */
5899                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5900
5901                         /* Now lets copy it out */
5902                         if (len >= sizeofcpy) {
5903                                 /* It all fits, copy it in */
5904                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5905                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5906                         } else {
5907                                 /* fill up the end of the chain */
5908                                 if (len > 0) {
5909                                         m_copydata(clonechain, 0, len, cp);
5910                                         SCTP_BUF_LEN((*endofchain)) += len;
5911                                         /* now we need another one */
5912                                         sizeofcpy -= len;
5913                                 }
5914                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5915                                 if (m == NULL) {
5916                                         /* We failed */
5917                                         goto error_out;
5918                                 }
5919                                 SCTP_BUF_NEXT((*endofchain)) = m;
5920                                 *endofchain = m;
5921                                 cp = mtod((*endofchain), caddr_t);
5922                                 m_copydata(clonechain, len, sizeofcpy, cp);
5923                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5924                         }
5925                         return (outchain);
5926                 } else {
5927                         /* copy the old fashion way */
5928                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5929 #ifdef SCTP_MBUF_LOGGING
5930                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5931                                 struct mbuf *mat;
5932
5933                                 mat = appendchain;
5934                                 while (mat) {
5935                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5936                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5937                                         }
5938                                         mat = SCTP_BUF_NEXT(mat);
5939                                 }
5940                         }
5941 #endif
5942                 }
5943         }
5944         if (appendchain == NULL) {
5945                 /* error */
5946                 if (outchain)
5947                         sctp_m_freem(outchain);
5948                 return (NULL);
5949         }
5950         if (outchain) {
5951                 /* tack on to the end */
5952                 if (*endofchain != NULL) {
5953                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
5954                 } else {
5955                         m = outchain;
5956                         while (m) {
5957                                 if (SCTP_BUF_NEXT(m) == NULL) {
5958                                         SCTP_BUF_NEXT(m) = appendchain;
5959                                         break;
5960                                 }
5961                                 m = SCTP_BUF_NEXT(m);
5962                         }
5963                 }
5964                 /*
5965                  * save off the end and update the end-chain postion
5966                  */
5967                 m = appendchain;
5968                 while (m) {
5969                         if (SCTP_BUF_NEXT(m) == NULL) {
5970                                 *endofchain = m;
5971                                 break;
5972                         }
5973                         m = SCTP_BUF_NEXT(m);
5974                 }
5975                 return (outchain);
5976         } else {
5977                 /* save off the end and update the end-chain postion */
5978                 m = appendchain;
5979                 while (m) {
5980                         if (SCTP_BUF_NEXT(m) == NULL) {
5981                                 *endofchain = m;
5982                                 break;
5983                         }
5984                         m = SCTP_BUF_NEXT(m);
5985                 }
5986                 return (appendchain);
5987         }
5988 }
5989
5990 int
5991 sctp_med_chunk_output(struct sctp_inpcb *inp,
5992     struct sctp_tcb *stcb,
5993     struct sctp_association *asoc,
5994     int *num_out,
5995     int *reason_code,
5996     int control_only, int from_where,
5997     struct timeval *now, int *now_filled, int frag_point, int so_locked
5998 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
5999     SCTP_UNUSED
6000 #endif
6001 );
6002
6003 static void
6004 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6005     uint32_t val)
6006 {
6007         struct sctp_copy_all *ca;
6008         struct mbuf *m;
6009         int ret = 0;
6010         int added_control = 0;
6011         int un_sent, do_chunk_output = 1;
6012         struct sctp_association *asoc;
6013
6014         ca = (struct sctp_copy_all *)ptr;
6015         if (ca->m == NULL) {
6016                 return;
6017         }
6018         if (ca->inp != inp) {
6019                 /* TSNH */
6020                 return;
6021         }
6022         if ((ca->m) && ca->sndlen) {
6023                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6024                 if (m == NULL) {
6025                         /* can't copy so we are done */
6026                         ca->cnt_failed++;
6027                         return;
6028                 }
6029 #ifdef SCTP_MBUF_LOGGING
6030                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6031                         struct mbuf *mat;
6032
6033                         mat = m;
6034                         while (mat) {
6035                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6036                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6037                                 }
6038                                 mat = SCTP_BUF_NEXT(mat);
6039                         }
6040                 }
6041 #endif
6042         } else {
6043                 m = NULL;
6044         }
6045         SCTP_TCB_LOCK_ASSERT(stcb);
6046         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6047                 /* Abort this assoc with m as the user defined reason */
6048                 if (m) {
6049                         struct sctp_paramhdr *ph;
6050
6051                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6052                         if (m) {
6053                                 ph = mtod(m, struct sctp_paramhdr *);
6054                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6055                                 ph->param_length = htons(ca->sndlen);
6056                         }
6057                         /*
6058                          * We add one here to keep the assoc from
6059                          * dis-appearing on us.
6060                          */
6061                         atomic_add_int(&stcb->asoc.refcnt, 1);
6062                         sctp_abort_an_association(inp, stcb,
6063                             SCTP_RESPONSE_TO_USER_REQ,
6064                             m, SCTP_SO_NOT_LOCKED);
6065                         /*
6066                          * sctp_abort_an_association calls sctp_free_asoc()
6067                          * free association will NOT free it since we
6068                          * incremented the refcnt .. we do this to prevent
6069                          * it being freed and things getting tricky since we
6070                          * could end up (from free_asoc) calling inpcb_free
6071                          * which would get a recursive lock call to the
6072                          * iterator lock.. But as a consequence of that the
6073                          * stcb will return to us un-locked.. since
6074                          * free_asoc returns with either no TCB or the TCB
6075                          * unlocked, we must relock.. to unlock in the
6076                          * iterator timer :-0
6077                          */
6078                         SCTP_TCB_LOCK(stcb);
6079                         atomic_add_int(&stcb->asoc.refcnt, -1);
6080                         goto no_chunk_output;
6081                 }
6082         } else {
6083                 if (m) {
6084                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6085                             &ca->sndrcv, 1);
6086                 }
6087                 asoc = &stcb->asoc;
6088                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6089                         /* shutdown this assoc */
6090                         int cnt;
6091
6092                         cnt = sctp_is_there_unsent_data(stcb);
6093
6094                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6095                             TAILQ_EMPTY(&asoc->sent_queue) &&
6096                             (cnt == 0)) {
6097                                 if (asoc->locked_on_sending) {
6098                                         goto abort_anyway;
6099                                 }
6100                                 /*
6101                                  * there is nothing queued to send, so I'm
6102                                  * done...
6103                                  */
6104                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6105                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6106                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6107                                         /*
6108                                          * only send SHUTDOWN the first time
6109                                          * through
6110                                          */
6111                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6112                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6113                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6114                                         }
6115                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6116                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6117                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6118                                             asoc->primary_destination);
6119                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6120                                             asoc->primary_destination);
6121                                         added_control = 1;
6122                                         do_chunk_output = 0;
6123                                 }
6124                         } else {
6125                                 /*
6126                                  * we still got (or just got) data to send,
6127                                  * so set SHUTDOWN_PENDING
6128                                  */
6129                                 /*
6130                                  * XXX sockets draft says that SCTP_EOF
6131                                  * should be sent with no data.  currently,
6132                                  * we will allow user data to be sent first
6133                                  * and move to SHUTDOWN-PENDING
6134                                  */
6135                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6136                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6137                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6138                                         if (asoc->locked_on_sending) {
6139                                                 /*
6140                                                  * Locked to send out the
6141                                                  * data
6142                                                  */
6143                                                 struct sctp_stream_queue_pending *sp;
6144
6145                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6146                                                 if (sp) {
6147                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6148                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6149                                                 }
6150                                         }
6151                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6152                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6153                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6154                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6155                                 abort_anyway:
6156                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6157                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6158                                                     SCTP_RESPONSE_TO_USER_REQ,
6159                                                     NULL, SCTP_SO_NOT_LOCKED);
6160                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6161                                                 goto no_chunk_output;
6162                                         }
6163                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6164                                             asoc->primary_destination);
6165                                 }
6166                         }
6167
6168                 }
6169         }
6170         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6171             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6172
6173         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6174             (stcb->asoc.total_flight > 0) &&
6175             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6176             ) {
6177                 do_chunk_output = 0;
6178         }
6179         if (do_chunk_output)
6180                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6181         else if (added_control) {
6182                 int num_out = 0, reason = 0, now_filled = 0;
6183                 struct timeval now;
6184                 int frag_point;
6185
6186                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6187                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6188                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6189         }
6190 no_chunk_output:
6191         if (ret) {
6192                 ca->cnt_failed++;
6193         } else {
6194                 ca->cnt_sent++;
6195         }
6196 }
6197
6198 static void
6199 sctp_sendall_completes(void *ptr, uint32_t val)
6200 {
6201         struct sctp_copy_all *ca;
6202
6203         ca = (struct sctp_copy_all *)ptr;
6204         /*
6205          * Do a notify here? Kacheong suggests that the notify be done at
6206          * the send time.. so you would push up a notification if any send
6207          * failed. Don't know if this is feasable since the only failures we
6208          * have is "memory" related and if you cannot get an mbuf to send
6209          * the data you surely can't get an mbuf to send up to notify the
6210          * user you can't send the data :->
6211          */
6212
6213         /* now free everything */
6214         sctp_m_freem(ca->m);
6215         SCTP_FREE(ca, SCTP_M_COPYAL);
6216 }
6217
6218
6219 #define MC_ALIGN(m, len) do {                                           \
6220         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6221 } while (0)
6222
6223
6224
6225 static struct mbuf *
6226 sctp_copy_out_all(struct uio *uio, int len)
6227 {
6228         struct mbuf *ret, *at;
6229         int left, willcpy, cancpy, error;
6230
6231         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6232         if (ret == NULL) {
6233                 /* TSNH */
6234                 return (NULL);
6235         }
6236         left = len;
6237         SCTP_BUF_LEN(ret) = 0;
6238         /* save space for the data chunk header */
6239         cancpy = M_TRAILINGSPACE(ret);
6240         willcpy = min(cancpy, left);
6241         at = ret;
6242         while (left > 0) {
6243                 /* Align data to the end */
6244                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6245                 if (error) {
6246         err_out_now:
6247                         sctp_m_freem(at);
6248                         return (NULL);
6249                 }
6250                 SCTP_BUF_LEN(at) = willcpy;
6251                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6252                 left -= willcpy;
6253                 if (left > 0) {
6254                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6255                         if (SCTP_BUF_NEXT(at) == NULL) {
6256                                 goto err_out_now;
6257                         }
6258                         at = SCTP_BUF_NEXT(at);
6259                         SCTP_BUF_LEN(at) = 0;
6260                         cancpy = M_TRAILINGSPACE(at);
6261                         willcpy = min(cancpy, left);
6262                 }
6263         }
6264         return (ret);
6265 }
6266
6267 static int
6268 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6269     struct sctp_sndrcvinfo *srcv)
6270 {
6271         int ret;
6272         struct sctp_copy_all *ca;
6273
6274         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6275             SCTP_M_COPYAL);
6276         if (ca == NULL) {
6277                 sctp_m_freem(m);
6278                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6279                 return (ENOMEM);
6280         }
6281         memset(ca, 0, sizeof(struct sctp_copy_all));
6282
6283         ca->inp = inp;
6284         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6285         /*
6286          * take off the sendall flag, it would be bad if we failed to do
6287          * this :-0
6288          */
6289         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6290         /* get length and mbuf chain */
6291         if (uio) {
6292                 ca->sndlen = uio->uio_resid;
6293                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6294                 if (ca->m == NULL) {
6295                         SCTP_FREE(ca, SCTP_M_COPYAL);
6296                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6297                         return (ENOMEM);
6298                 }
6299         } else {
6300                 /* Gather the length of the send */
6301                 struct mbuf *mat;
6302
6303                 mat = m;
6304                 ca->sndlen = 0;
6305                 while (m) {
6306                         ca->sndlen += SCTP_BUF_LEN(m);
6307                         m = SCTP_BUF_NEXT(m);
6308                 }
6309                 ca->m = mat;
6310         }
6311         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6312             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6313             SCTP_ASOC_ANY_STATE,
6314             (void *)ca, 0,
6315             sctp_sendall_completes, inp, 1);
6316         if (ret) {
6317                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6318                 SCTP_FREE(ca, SCTP_M_COPYAL);
6319                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6320                 return (EFAULT);
6321         }
6322         return (0);
6323 }
6324
6325
6326 void
6327 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6328 {
6329         struct sctp_tmit_chunk *chk, *nchk;
6330
6331         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6332                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6333                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6334                         if (chk->data) {
6335                                 sctp_m_freem(chk->data);
6336                                 chk->data = NULL;
6337                         }
6338                         asoc->ctrl_queue_cnt--;
6339                         sctp_free_a_chunk(stcb, chk);
6340                 }
6341         }
6342 }
6343
6344 void
6345 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6346 {
6347         struct sctp_association *asoc;
6348         struct sctp_tmit_chunk *chk, *nchk;
6349         struct sctp_asconf_chunk *acp;
6350
6351         asoc = &stcb->asoc;
6352         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6353                 /* find SCTP_ASCONF chunk in queue */
6354                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6355                         if (chk->data) {
6356                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6357                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6358                                         /* Not Acked yet */
6359                                         break;
6360                                 }
6361                         }
6362                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6363                         if (chk->data) {
6364                                 sctp_m_freem(chk->data);
6365                                 chk->data = NULL;
6366                         }
6367                         asoc->ctrl_queue_cnt--;
6368                         sctp_free_a_chunk(stcb, chk);
6369                 }
6370         }
6371 }
6372
6373
6374 static void
6375 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6376     struct sctp_association *asoc,
6377     struct sctp_tmit_chunk **data_list,
6378     int bundle_at,
6379     struct sctp_nets *net)
6380 {
6381         int i;
6382         struct sctp_tmit_chunk *tp1;
6383
6384         for (i = 0; i < bundle_at; i++) {
6385                 /* off of the send queue */
6386                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6387                 asoc->send_queue_cnt--;
6388                 if (i > 0) {
6389                         /*
6390                          * Any chunk NOT 0 you zap the time chunk 0 gets
6391                          * zapped or set based on if a RTO measurment is
6392                          * needed.
6393                          */
6394                         data_list[i]->do_rtt = 0;
6395                 }
6396                 /* record time */
6397                 data_list[i]->sent_rcv_time = net->last_sent_time;
6398                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6399                 if (data_list[i]->whoTo == NULL) {
6400                         data_list[i]->whoTo = net;
6401                         atomic_add_int(&net->ref_count, 1);
6402                 }
6403                 /* on to the sent queue */
6404                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6405                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6406                         struct sctp_tmit_chunk *tpp;
6407
6408                         /* need to move back */
6409         back_up_more:
6410                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6411                         if (tpp == NULL) {
6412                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6413                                 goto all_done;
6414                         }
6415                         tp1 = tpp;
6416                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6417                                 goto back_up_more;
6418                         }
6419                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6420                 } else {
6421                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6422                             data_list[i],
6423                             sctp_next);
6424                 }
6425 all_done:
6426                 /* This does not lower until the cum-ack passes it */
6427                 asoc->sent_queue_cnt++;
6428                 if ((asoc->peers_rwnd <= 0) &&
6429                     (asoc->total_flight == 0) &&
6430                     (bundle_at == 1)) {
6431                         /* Mark the chunk as being a window probe */
6432                         SCTP_STAT_INCR(sctps_windowprobed);
6433                 }
6434 #ifdef SCTP_AUDITING_ENABLED
6435                 sctp_audit_log(0xC2, 3);
6436 #endif
6437                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6438                 data_list[i]->snd_count = 1;
6439                 data_list[i]->rec.data.chunk_was_revoked = 0;
6440                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6441                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6442                             data_list[i]->whoTo->flight_size,
6443                             data_list[i]->book_size,
6444                             (uintptr_t) data_list[i]->whoTo,
6445                             data_list[i]->rec.data.TSN_seq);
6446                 }
6447                 sctp_flight_size_increase(data_list[i]);
6448                 sctp_total_flight_increase(stcb, data_list[i]);
6449                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6450                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6451                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6452                 }
6453                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6454                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6455                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6456                         /* SWS sender side engages */
6457                         asoc->peers_rwnd = 0;
6458                 }
6459         }
6460 }
6461
6462 static void
6463 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6464 {
6465         struct sctp_tmit_chunk *chk, *nchk;
6466
6467         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6468                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6469                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6470                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6471                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6472                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6473                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6474                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6475                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6476                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6477                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6478                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6479                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6480                         /* Stray chunks must be cleaned up */
6481         clean_up_anyway:
6482                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6483                         if (chk->data) {
6484                                 sctp_m_freem(chk->data);
6485                                 chk->data = NULL;
6486                         }
6487                         asoc->ctrl_queue_cnt--;
6488                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6489                                 asoc->fwd_tsn_cnt--;
6490                         sctp_free_a_chunk(stcb, chk);
6491                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6492                         /* special handling, we must look into the param */
6493                         if (chk != asoc->str_reset) {
6494                                 goto clean_up_anyway;
6495                         }
6496                 }
6497         }
6498 }
6499
6500
6501 static int
6502 sctp_can_we_split_this(struct sctp_tcb *stcb,
6503     uint32_t length,
6504     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6505 {
6506         /*
6507          * Make a decision on if I should split a msg into multiple parts.
6508          * This is only asked of incomplete messages.
6509          */
6510         if (eeor_on) {
6511                 /*
6512                  * If we are doing EEOR we need to always send it if its the
6513                  * entire thing, since it might be all the guy is putting in
6514                  * the hopper.
6515                  */
6516                 if (goal_mtu >= length) {
6517                         /*-
6518                          * If we have data outstanding,
6519                          * we get another chance when the sack
6520                          * arrives to transmit - wait for more data
6521                          */
6522                         if (stcb->asoc.total_flight == 0) {
6523                                 /*
6524                                  * If nothing is in flight, we zero the
6525                                  * packet counter.
6526                                  */
6527                                 return (length);
6528                         }
6529                         return (0);
6530
6531                 } else {
6532                         /* You can fill the rest */
6533                         return (goal_mtu);
6534                 }
6535         }
6536         /*-
6537          * For those strange folk that make the send buffer
6538          * smaller than our fragmentation point, we can't
6539          * get a full msg in so we have to allow splitting.
6540          */
6541         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6542                 return (length);
6543         }
6544         if ((length <= goal_mtu) ||
6545             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6546                 /* Sub-optimial residual don't split in non-eeor mode. */
6547                 return (0);
6548         }
6549         /*
6550          * If we reach here length is larger than the goal_mtu. Do we wish
6551          * to split it for the sake of packet putting together?
6552          */
6553         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6554                 /* Its ok to split it */
6555                 return (min(goal_mtu, frag_point));
6556         }
6557         /* Nope, can't split */
6558         return (0);
6559
6560 }
6561
6562 static uint32_t
6563 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6564     struct sctp_stream_out *strq,
6565     uint32_t goal_mtu,
6566     uint32_t frag_point,
6567     int *locked,
6568     int *giveup,
6569     int eeor_mode,
6570     int *bail)
6571 {
6572         /* Move from the stream to the send_queue keeping track of the total */
6573         struct sctp_association *asoc;
6574         struct sctp_stream_queue_pending *sp;
6575         struct sctp_tmit_chunk *chk;
6576         struct sctp_data_chunk *dchkh;
6577         uint32_t to_move, length;
6578         uint8_t rcv_flags = 0;
6579         uint8_t some_taken;
6580         uint8_t send_lock_up = 0;
6581
6582         SCTP_TCB_LOCK_ASSERT(stcb);
6583         asoc = &stcb->asoc;
6584 one_more_time:
6585         /* sa_ignore FREED_MEMORY */
6586         sp = TAILQ_FIRST(&strq->outqueue);
6587         if (sp == NULL) {
6588                 *locked = 0;
6589                 if (send_lock_up == 0) {
6590                         SCTP_TCB_SEND_LOCK(stcb);
6591                         send_lock_up = 1;
6592                 }
6593                 sp = TAILQ_FIRST(&strq->outqueue);
6594                 if (sp) {
6595                         goto one_more_time;
6596                 }
6597                 if (strq->last_msg_incomplete) {
6598                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6599                             strq->stream_no,
6600                             strq->last_msg_incomplete);
6601                         strq->last_msg_incomplete = 0;
6602                 }
6603                 to_move = 0;
6604                 if (send_lock_up) {
6605                         SCTP_TCB_SEND_UNLOCK(stcb);
6606                         send_lock_up = 0;
6607                 }
6608                 goto out_of;
6609         }
6610         if ((sp->msg_is_complete) && (sp->length == 0)) {
6611                 if (sp->sender_all_done) {
6612                         /*
6613                          * We are doing differed cleanup. Last time through
6614                          * when we took all the data the sender_all_done was
6615                          * not set.
6616                          */
6617                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6618                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6619                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6620                                     sp->sender_all_done,
6621                                     sp->length,
6622                                     sp->msg_is_complete,
6623                                     sp->put_last_out,
6624                                     send_lock_up);
6625                         }
6626                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6627                                 SCTP_TCB_SEND_LOCK(stcb);
6628                                 send_lock_up = 1;
6629                         }
6630                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6631                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6632                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
6633                         if (sp->net) {
6634                                 sctp_free_remote_addr(sp->net);
6635                                 sp->net = NULL;
6636                         }
6637                         if (sp->data) {
6638                                 sctp_m_freem(sp->data);
6639                                 sp->data = NULL;
6640                         }
6641                         sctp_free_a_strmoq(stcb, sp);
6642                         /* we can't be locked to it */
6643                         *locked = 0;
6644                         stcb->asoc.locked_on_sending = NULL;
6645                         if (send_lock_up) {
6646                                 SCTP_TCB_SEND_UNLOCK(stcb);
6647                                 send_lock_up = 0;
6648                         }
6649                         /* back to get the next msg */
6650                         goto one_more_time;
6651                 } else {
6652                         /*
6653                          * sender just finished this but still holds a
6654                          * reference
6655                          */
6656                         *locked = 1;
6657                         *giveup = 1;
6658                         to_move = 0;
6659                         goto out_of;
6660                 }
6661         } else {
6662                 /* is there some to get */
6663                 if (sp->length == 0) {
6664                         /* no */
6665                         *locked = 1;
6666                         *giveup = 1;
6667                         to_move = 0;
6668                         goto out_of;
6669                 } else if (sp->discard_rest) {
6670                         if (send_lock_up == 0) {
6671                                 SCTP_TCB_SEND_LOCK(stcb);
6672                                 send_lock_up = 1;
6673                         }
6674                         /* Whack down the size */
6675                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6676                         if ((stcb->sctp_socket != NULL) && \
6677                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6678                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6679                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6680                         }
6681                         if (sp->data) {
6682                                 sctp_m_freem(sp->data);
6683                                 sp->data = NULL;
6684                                 sp->tail_mbuf = NULL;
6685                         }
6686                         sp->length = 0;
6687                         sp->some_taken = 1;
6688                         *locked = 1;
6689                         *giveup = 1;
6690                         to_move = 0;
6691                         goto out_of;
6692                 }
6693         }
6694         some_taken = sp->some_taken;
6695         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6696                 sp->msg_is_complete = 1;
6697         }
6698 re_look:
6699         length = sp->length;
6700         if (sp->msg_is_complete) {
6701                 /* The message is complete */
6702                 to_move = min(length, frag_point);
6703                 if (to_move == length) {
6704                         /* All of it fits in the MTU */
6705                         if (sp->some_taken) {
6706                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6707                                 sp->put_last_out = 1;
6708                         } else {
6709                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6710                                 sp->put_last_out = 1;
6711                         }
6712                 } else {
6713                         /* Not all of it fits, we fragment */
6714                         if (sp->some_taken == 0) {
6715                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6716                         }
6717                         sp->some_taken = 1;
6718                 }
6719         } else {
6720                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6721                 if (to_move) {
6722                         /*-
6723                          * We use a snapshot of length in case it
6724                          * is expanding during the compare.
6725                          */
6726                         uint32_t llen;
6727
6728                         llen = length;
6729                         if (to_move >= llen) {
6730                                 to_move = llen;
6731                                 if (send_lock_up == 0) {
6732                                         /*-
6733                                          * We are taking all of an incomplete msg
6734                                          * thus we need a send lock.
6735                                          */
6736                                         SCTP_TCB_SEND_LOCK(stcb);
6737                                         send_lock_up = 1;
6738                                         if (sp->msg_is_complete) {
6739                                                 /*
6740                                                  * the sender finished the
6741                                                  * msg
6742                                                  */
6743                                                 goto re_look;
6744                                         }
6745                                 }
6746                         }
6747                         if (sp->some_taken == 0) {
6748                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6749                                 sp->some_taken = 1;
6750                         }
6751                 } else {
6752                         /* Nothing to take. */
6753                         if (sp->some_taken) {
6754                                 *locked = 1;
6755                         }
6756                         *giveup = 1;
6757                         to_move = 0;
6758                         goto out_of;
6759                 }
6760         }
6761
6762         /* If we reach here, we can copy out a chunk */
6763         sctp_alloc_a_chunk(stcb, chk);
6764         if (chk == NULL) {
6765                 /* No chunk memory */
6766                 *giveup = 1;
6767                 to_move = 0;
6768                 goto out_of;
6769         }
6770         /*
6771          * Setup for unordered if needed by looking at the user sent info
6772          * flags.
6773          */
6774         if (sp->sinfo_flags & SCTP_UNORDERED) {
6775                 rcv_flags |= SCTP_DATA_UNORDERED;
6776         }
6777         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6778             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6779                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6780         }
6781         /* clear out the chunk before setting up */
6782         memset(chk, 0, sizeof(*chk));
6783         chk->rec.data.rcv_flags = rcv_flags;
6784
6785         if (to_move >= length) {
6786                 /* we think we can steal the whole thing */
6787                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6788                         SCTP_TCB_SEND_LOCK(stcb);
6789                         send_lock_up = 1;
6790                 }
6791                 if (to_move < sp->length) {
6792                         /* bail, it changed */
6793                         goto dont_do_it;
6794                 }
6795                 chk->data = sp->data;
6796                 chk->last_mbuf = sp->tail_mbuf;
6797                 /* register the stealing */
6798                 sp->data = sp->tail_mbuf = NULL;
6799         } else {
6800                 struct mbuf *m;
6801
6802 dont_do_it:
6803                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6804                 chk->last_mbuf = NULL;
6805                 if (chk->data == NULL) {
6806                         sp->some_taken = some_taken;
6807                         sctp_free_a_chunk(stcb, chk);
6808                         *bail = 1;
6809                         to_move = 0;
6810                         goto out_of;
6811                 }
6812 #ifdef SCTP_MBUF_LOGGING
6813                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6814                         struct mbuf *mat;
6815
6816                         mat = chk->data;
6817                         while (mat) {
6818                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6819                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6820                                 }
6821                                 mat = SCTP_BUF_NEXT(mat);
6822                         }
6823                 }
6824 #endif
6825                 /* Pull off the data */
6826                 m_adj(sp->data, to_move);
6827                 /* Now lets work our way down and compact it */
6828                 m = sp->data;
6829                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6830                         sp->data = SCTP_BUF_NEXT(m);
6831                         SCTP_BUF_NEXT(m) = NULL;
6832                         if (sp->tail_mbuf == m) {
6833                                 /*-
6834                                  * Freeing tail? TSNH since
6835                                  * we supposedly were taking less
6836                                  * than the sp->length.
6837                                  */
6838 #ifdef INVARIANTS
6839                                 panic("Huh, freing tail? - TSNH");
6840 #else
6841                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6842                                 sp->tail_mbuf = sp->data = NULL;
6843                                 sp->length = 0;
6844 #endif
6845
6846                         }
6847                         sctp_m_free(m);
6848                         m = sp->data;
6849                 }
6850         }
6851         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6852                 chk->copy_by_ref = 1;
6853         } else {
6854                 chk->copy_by_ref = 0;
6855         }
6856         /*
6857          * get last_mbuf and counts of mb useage This is ugly but hopefully
6858          * its only one mbuf.
6859          */
6860         if (chk->last_mbuf == NULL) {
6861                 chk->last_mbuf = chk->data;
6862                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6863                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6864                 }
6865         }
6866         if (to_move > length) {
6867                 /*- This should not happen either
6868                  * since we always lower to_move to the size
6869                  * of sp->length if its larger.
6870                  */
6871 #ifdef INVARIANTS
6872                 panic("Huh, how can to_move be larger?");
6873 #else
6874                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6875                 sp->length = 0;
6876 #endif
6877         } else {
6878                 atomic_subtract_int(&sp->length, to_move);
6879         }
6880         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6881                 /* Not enough room for a chunk header, get some */
6882                 struct mbuf *m;
6883
6884                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6885                 if (m == NULL) {
6886                         /*
6887                          * we're in trouble here. _PREPEND below will free
6888                          * all the data if there is no leading space, so we
6889                          * must put the data back and restore.
6890                          */
6891                         if (send_lock_up == 0) {
6892                                 SCTP_TCB_SEND_LOCK(stcb);
6893                                 send_lock_up = 1;
6894                         }
6895                         if (chk->data == NULL) {
6896                                 /* unsteal the data */
6897                                 sp->data = chk->data;
6898                                 sp->tail_mbuf = chk->last_mbuf;
6899                         } else {
6900                                 struct mbuf *m_tmp;
6901
6902                                 /* reassemble the data */
6903                                 m_tmp = sp->data;
6904                                 sp->data = chk->data;
6905                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6906                         }
6907                         sp->some_taken = some_taken;
6908                         atomic_add_int(&sp->length, to_move);
6909                         chk->data = NULL;
6910                         *bail = 1;
6911                         sctp_free_a_chunk(stcb, chk);
6912                         to_move = 0;
6913                         goto out_of;
6914                 } else {
6915                         SCTP_BUF_LEN(m) = 0;
6916                         SCTP_BUF_NEXT(m) = chk->data;
6917                         chk->data = m;
6918                         M_ALIGN(chk->data, 4);
6919                 }
6920         }
6921         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6922         if (chk->data == NULL) {
6923                 /* HELP, TSNH since we assured it would not above? */
6924 #ifdef INVARIANTS
6925                 panic("prepend failes HELP?");
6926 #else
6927                 SCTP_PRINTF("prepend fails HELP?\n");
6928                 sctp_free_a_chunk(stcb, chk);
6929 #endif
6930                 *bail = 1;
6931                 to_move = 0;
6932                 goto out_of;
6933         }
6934         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6935         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
6936         chk->book_size_scale = 0;
6937         chk->sent = SCTP_DATAGRAM_UNSENT;
6938
6939         chk->flags = 0;
6940         chk->asoc = &stcb->asoc;
6941         chk->pad_inplace = 0;
6942         chk->no_fr_allowed = 0;
6943         chk->rec.data.stream_seq = sp->strseq;
6944         chk->rec.data.stream_number = sp->stream;
6945         chk->rec.data.payloadtype = sp->ppid;
6946         chk->rec.data.context = sp->context;
6947         chk->rec.data.doing_fast_retransmit = 0;
6948
6949         chk->rec.data.timetodrop = sp->ts;
6950         chk->flags = sp->act_flags;
6951
6952         if (sp->net) {
6953                 chk->whoTo = sp->net;
6954                 atomic_add_int(&chk->whoTo->ref_count, 1);
6955         } else
6956                 chk->whoTo = NULL;
6957
6958         if (sp->holds_key_ref) {
6959                 chk->auth_keyid = sp->auth_keyid;
6960                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
6961                 chk->holds_key_ref = 1;
6962         }
6963         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6964         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
6965                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6966                     (uintptr_t) stcb, sp->length,
6967                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6968                     chk->rec.data.TSN_seq);
6969         }
6970         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6971         /*
6972          * Put the rest of the things in place now. Size was done earlier in
6973          * previous loop prior to padding.
6974          */
6975
6976 #ifdef SCTP_ASOCLOG_OF_TSNS
6977         SCTP_TCB_LOCK_ASSERT(stcb);
6978         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
6979                 asoc->tsn_out_at = 0;
6980                 asoc->tsn_out_wrapped = 1;
6981         }
6982         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
6983         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
6984         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
6985         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
6986         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
6987         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
6988         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
6989         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
6990         asoc->tsn_out_at++;
6991 #endif
6992
6993         dchkh->ch.chunk_type = SCTP_DATA;
6994         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
6995         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
6996         dchkh->dp.stream_id = htons(strq->stream_no);
6997         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
6998         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
6999         dchkh->ch.chunk_length = htons(chk->send_size);
7000         /* Now advance the chk->send_size by the actual pad needed. */
7001         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7002                 /* need a pad */
7003                 struct mbuf *lm;
7004                 int pads;
7005
7006                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7007                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7008                         chk->pad_inplace = 1;
7009                 }
7010                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7011                         /* pad added an mbuf */
7012                         chk->last_mbuf = lm;
7013                 }
7014                 chk->send_size += pads;
7015         }
7016         /* We only re-set the policy if it is on */
7017         if (sp->pr_sctp_on) {
7018                 sctp_set_prsctp_policy(sp);
7019                 asoc->pr_sctp_cnt++;
7020                 chk->pr_sctp_on = 1;
7021         } else {
7022                 chk->pr_sctp_on = 0;
7023         }
7024         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7025                 /* All done pull and kill the message */
7026                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7027                 if (sp->put_last_out == 0) {
7028                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7029                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7030                             sp->sender_all_done,
7031                             sp->length,
7032                             sp->msg_is_complete,
7033                             sp->put_last_out,
7034                             send_lock_up);
7035                 }
7036                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7037                         SCTP_TCB_SEND_LOCK(stcb);
7038                         send_lock_up = 1;
7039                 }
7040                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7041                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7042                 if (sp->net) {
7043                         sctp_free_remote_addr(sp->net);
7044                         sp->net = NULL;
7045                 }
7046                 if (sp->data) {
7047                         sctp_m_freem(sp->data);
7048                         sp->data = NULL;
7049                 }
7050                 sctp_free_a_strmoq(stcb, sp);
7051
7052                 /* we can't be locked to it */
7053                 *locked = 0;
7054                 stcb->asoc.locked_on_sending = NULL;
7055         } else {
7056                 /* more to go, we are locked */
7057                 *locked = 1;
7058         }
7059         asoc->chunks_on_out_queue++;
7060         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7061         asoc->send_queue_cnt++;
7062 out_of:
7063         if (send_lock_up) {
7064                 SCTP_TCB_SEND_UNLOCK(stcb);
7065                 send_lock_up = 0;
7066         }
7067         return (to_move);
7068 }
7069
7070
7071 static void
7072 sctp_fill_outqueue(struct sctp_tcb *stcb,
7073     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7074 {
7075         struct sctp_association *asoc;
7076         struct sctp_stream_out *strq, *strqn;
7077         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7078         int locked, giveup;
7079
7080         SCTP_TCB_LOCK_ASSERT(stcb);
7081         asoc = &stcb->asoc;
7082 #ifdef INET6
7083         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7084                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7085         } else {
7086                 /* ?? not sure what else to do */
7087                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7088         }
7089 #else
7090         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7091 #endif
7092         /* Need an allowance for the data chunk header too */
7093         goal_mtu -= sizeof(struct sctp_data_chunk);
7094
7095         /* must make even word boundary */
7096         goal_mtu &= 0xfffffffc;
7097         if (asoc->locked_on_sending) {
7098                 /* We are stuck on one stream until the message completes. */
7099                 strq = asoc->locked_on_sending;
7100                 locked = 1;
7101         } else {
7102                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7103                 locked = 0;
7104         }
7105         strqn = strq;
7106         while ((goal_mtu > 0) && strq) {
7107                 giveup = 0;
7108                 bail = 0;
7109                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7110                     &giveup, eeor_mode, &bail);
7111                 if (moved_how_much)
7112                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7113
7114                 if (locked) {
7115                         asoc->locked_on_sending = strq;
7116                         if ((moved_how_much == 0) || (giveup) || bail)
7117                                 /* no more to move for now */
7118                                 break;
7119                 } else {
7120                         asoc->locked_on_sending = NULL;
7121                         if ((giveup) || bail) {
7122                                 break;
7123                         }
7124                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7125                         if (strq == NULL) {
7126                                 break;
7127                         }
7128                 }
7129                 total_moved += moved_how_much;
7130                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7131                 goal_mtu &= 0xfffffffc;
7132         }
7133         if (bail)
7134                 *quit_now = 1;
7135
7136         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7137
7138         if (total_moved == 0) {
7139                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7140                     (net == stcb->asoc.primary_destination)) {
7141                         /* ran dry for primary network net */
7142                         SCTP_STAT_INCR(sctps_primary_randry);
7143                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7144                         /* ran dry with CMT on */
7145                         SCTP_STAT_INCR(sctps_cmt_randry);
7146                 }
7147         }
7148 }
7149
7150 void
7151 sctp_fix_ecn_echo(struct sctp_association *asoc)
7152 {
7153         struct sctp_tmit_chunk *chk;
7154
7155         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7156                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7157                         chk->sent = SCTP_DATAGRAM_UNSENT;
7158                 }
7159         }
7160 }
7161
7162 void
7163 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7164 {
7165         struct sctp_association *asoc;
7166         struct sctp_tmit_chunk *chk;
7167         struct sctp_stream_queue_pending *sp;
7168         unsigned int i;
7169
7170         if (net == NULL) {
7171                 return;
7172         }
7173         asoc = &stcb->asoc;
7174         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7175                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7176                         if (sp->net == net) {
7177                                 sctp_free_remote_addr(sp->net);
7178                                 sp->net = NULL;
7179                         }
7180                 }
7181         }
7182         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7183                 if (chk->whoTo == net) {
7184                         sctp_free_remote_addr(chk->whoTo);
7185                         chk->whoTo = NULL;
7186                 }
7187         }
7188 }
7189
7190 int
7191 sctp_med_chunk_output(struct sctp_inpcb *inp,
7192     struct sctp_tcb *stcb,
7193     struct sctp_association *asoc,
7194     int *num_out,
7195     int *reason_code,
7196     int control_only, int from_where,
7197     struct timeval *now, int *now_filled, int frag_point, int so_locked
7198 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7199     SCTP_UNUSED
7200 #endif
7201 )
7202 {
7203         /*
7204          * Ok this is the generic chunk service queue. we must do the
7205          * following: - Service the stream queue that is next, moving any
7206          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7207          * LAST to the out queue in one pass) and assigning TSN's - Check to
7208          * see if the cwnd/rwnd allows any output, if so we go ahead and
7209          * fomulate and send the low level chunks. Making sure to combine
7210          * any control in the control chunk queue also.
7211          */
7212         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7213         struct mbuf *outchain, *endoutchain;
7214         struct sctp_tmit_chunk *chk, *nchk;
7215
7216         /* temp arrays for unlinking */
7217         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7218         int no_fragmentflg, error;
7219         unsigned int max_rwnd_per_dest, max_send_per_dest;
7220         int one_chunk, hbflag, skip_data_for_this_net;
7221         int asconf, cookie, no_out_cnt;
7222         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7223         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7224         int tsns_sent = 0;
7225         uint32_t auth_offset = 0;
7226         struct sctp_auth_chunk *auth = NULL;
7227         uint16_t auth_keyid;
7228         int override_ok = 1;
7229         int data_auth_reqd = 0;
7230
7231         /*
7232          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7233          * destination.
7234          */
7235         int pf_hbflag = 0;
7236         int quit_now = 0;
7237
7238         *num_out = 0;
7239         auth_keyid = stcb->asoc.authinfo.active_keyid;
7240
7241         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7242             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7243             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7244                 eeor_mode = 1;
7245         } else {
7246                 eeor_mode = 0;
7247         }
7248         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7249         /*
7250          * First lets prime the pump. For each destination, if there is room
7251          * in the flight size, attempt to pull an MTU's worth out of the
7252          * stream queues into the general send_queue
7253          */
7254 #ifdef SCTP_AUDITING_ENABLED
7255         sctp_audit_log(0xC2, 2);
7256 #endif
7257         SCTP_TCB_LOCK_ASSERT(stcb);
7258         hbflag = 0;
7259         if ((control_only) || (asoc->stream_reset_outstanding))
7260                 no_data_chunks = 1;
7261         else
7262                 no_data_chunks = 0;
7263
7264         /* Nothing to possible to send? */
7265         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7266             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7267             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7268             TAILQ_EMPTY(&asoc->send_queue) &&
7269             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7270 nothing_to_send:
7271                 *reason_code = 9;
7272                 return (0);
7273         }
7274         if (asoc->peers_rwnd == 0) {
7275                 /* No room in peers rwnd */
7276                 *reason_code = 1;
7277                 if (asoc->total_flight > 0) {
7278                         /* we are allowed one chunk in flight */
7279                         no_data_chunks = 1;
7280                 }
7281         }
7282         if (stcb->asoc.ecn_echo_cnt_onq) {
7283                 /* Record where a sack goes, if any */
7284                 if (no_data_chunks &&
7285                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7286                         /* Nothing but ECNe to send - we don't do that */
7287                         goto nothing_to_send;
7288                 }
7289                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7290                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7291                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7292                                 sack_goes_to = chk->whoTo;
7293                                 break;
7294                         }
7295                 }
7296         }
7297         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7298         if (stcb->sctp_socket)
7299                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7300         else
7301                 max_send_per_dest = 0;
7302         if ((no_data_chunks == 0) &&
7303             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7304                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7305                         /*
7306                          * This for loop we are in takes in each net, if
7307                          * its's got space in cwnd and has data sent to it
7308                          * (when CMT is off) then it calls
7309                          * sctp_fill_outqueue for the net. This gets data on
7310                          * the send queue for that network.
7311                          *
7312                          * In sctp_fill_outqueue TSN's are assigned and data is
7313                          * copied out of the stream buffers. Note mostly
7314                          * copy by reference (we hope).
7315                          */
7316                         net->window_probe = 0;
7317                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ||
7318                             (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7319                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7320                                         sctp_log_cwnd(stcb, net, 1,
7321                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7322                                 }
7323                                 continue;
7324                         }
7325                         if ((asoc->sctp_cmt_on_off == 0) &&
7326                             (asoc->primary_destination != net) &&
7327                             (net->ref_count < 2)) {
7328                                 /* nothing can be in queue for this guy */
7329                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7330                                         sctp_log_cwnd(stcb, net, 2,
7331                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7332                                 }
7333                                 continue;
7334                         }
7335                         if (net->flight_size >= net->cwnd) {
7336                                 /* skip this network, no room - can't fill */
7337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7338                                         sctp_log_cwnd(stcb, net, 3,
7339                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7340                                 }
7341                                 continue;
7342                         }
7343                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7344                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7345                         }
7346                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7347                         if (quit_now) {
7348                                 /* memory alloc failure */
7349                                 no_data_chunks = 1;
7350                                 break;
7351                         }
7352                 }
7353         }
7354         /* now service each destination and send out what we can for it */
7355         /* Nothing to send? */
7356         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7357             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7358             TAILQ_EMPTY(&asoc->send_queue)) {
7359                 *reason_code = 8;
7360                 return (0);
7361         }
7362         if (asoc->sctp_cmt_on_off > 0) {
7363                 /* get the last start point */
7364                 start_at = asoc->last_net_cmt_send_started;
7365                 if (start_at == NULL) {
7366                         /* null so to beginning */
7367                         start_at = TAILQ_FIRST(&asoc->nets);
7368                 } else {
7369                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7370                         if (start_at == NULL) {
7371                                 start_at = TAILQ_FIRST(&asoc->nets);
7372                         }
7373                 }
7374                 asoc->last_net_cmt_send_started = start_at;
7375         } else {
7376                 start_at = TAILQ_FIRST(&asoc->nets);
7377         }
7378         old_start_at = NULL;
7379 again_one_more_time:
7380         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7381                 /* how much can we send? */
7382                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7383                 if (old_start_at && (old_start_at == net)) {
7384                         /* through list ocmpletely. */
7385                         break;
7386                 }
7387                 tsns_sent = 0xa;
7388                 if ((asoc->sctp_cmt_on_off == 0) &&
7389                     (asoc->primary_destination != net) &&
7390                     (net->ref_count < 2)) {
7391                         /*
7392                          * Ref-count of 1 so we cannot have data or control
7393                          * queued to this address. Skip it (non-CMT).
7394                          */
7395                         continue;
7396                 }
7397                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7398                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7399                     (net->flight_size >= net->cwnd)) {
7400                         /*
7401                          * Nothing on control or asconf and flight is full,
7402                          * we can skip even in the CMT case.
7403                          */
7404                         continue;
7405                 }
7406                 ctl_cnt = bundle_at = 0;
7407                 endoutchain = outchain = NULL;
7408                 no_fragmentflg = 1;
7409                 one_chunk = 0;
7410                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7411                         skip_data_for_this_net = 1;
7412                 } else {
7413                         skip_data_for_this_net = 0;
7414                 }
7415                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7416                         /*
7417                          * if we have a route and an ifp check to see if we
7418                          * have room to send to this guy
7419                          */
7420                         struct ifnet *ifp;
7421
7422                         ifp = net->ro.ro_rt->rt_ifp;
7423                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7424                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7425                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7426                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7427                                 }
7428                                 continue;
7429                         }
7430                 }
7431                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7432                 case AF_INET:
7433                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7434                         break;
7435 #ifdef INET6
7436                 case AF_INET6:
7437                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7438                         break;
7439 #endif
7440                 default:
7441                         /* TSNH */
7442                         mtu = net->mtu;
7443                         break;
7444                 }
7445                 mx_mtu = mtu;
7446                 to_out = 0;
7447                 if (mtu > asoc->peers_rwnd) {
7448                         if (asoc->total_flight > 0) {
7449                                 /* We have a packet in flight somewhere */
7450                                 r_mtu = asoc->peers_rwnd;
7451                         } else {
7452                                 /* We are always allowed to send one MTU out */
7453                                 one_chunk = 1;
7454                                 r_mtu = mtu;
7455                         }
7456                 } else {
7457                         r_mtu = mtu;
7458                 }
7459                 /************************/
7460                 /* ASCONF transmission */
7461                 /************************/
7462                 /* Now first lets go through the asconf queue */
7463                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7464                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7465                                 continue;
7466                         }
7467                         if (chk->whoTo != net) {
7468                                 /*
7469                                  * No, not sent to the network we are
7470                                  * looking at
7471                                  */
7472                                 break;
7473                         }
7474                         if (chk->data == NULL) {
7475                                 break;
7476                         }
7477                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7478                             chk->sent != SCTP_DATAGRAM_RESEND) {
7479                                 break;
7480                         }
7481                         /*
7482                          * if no AUTH is yet included and this chunk
7483                          * requires it, make sure to account for it.  We
7484                          * don't apply the size until the AUTH chunk is
7485                          * actually added below in case there is no room for
7486                          * this chunk. NOTE: we overload the use of "omtu"
7487                          * here
7488                          */
7489                         if ((auth == NULL) &&
7490                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7491                             stcb->asoc.peer_auth_chunks)) {
7492                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7493                         } else
7494                                 omtu = 0;
7495                         /* Here we do NOT factor the r_mtu */
7496                         if ((chk->send_size < (int)(mtu - omtu)) ||
7497                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7498                                 /*
7499                                  * We probably should glom the mbuf chain
7500                                  * from the chk->data for control but the
7501                                  * problem is it becomes yet one more level
7502                                  * of tracking to do if for some reason
7503                                  * output fails. Then I have got to
7504                                  * reconstruct the merged control chain.. el
7505                                  * yucko.. for now we take the easy way and
7506                                  * do the copy
7507                                  */
7508                                 /*
7509                                  * Add an AUTH chunk, if chunk requires it
7510                                  * save the offset into the chain for AUTH
7511                                  */
7512                                 if ((auth == NULL) &&
7513                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7514                                     stcb->asoc.peer_auth_chunks))) {
7515                                         outchain = sctp_add_auth_chunk(outchain,
7516                                             &endoutchain,
7517                                             &auth,
7518                                             &auth_offset,
7519                                             stcb,
7520                                             chk->rec.chunk_id.id);
7521                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7522                                 }
7523                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7524                                     (int)chk->rec.chunk_id.can_take_data,
7525                                     chk->send_size, chk->copy_by_ref);
7526                                 if (outchain == NULL) {
7527                                         *reason_code = 8;
7528                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7529                                         return (ENOMEM);
7530                                 }
7531                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7532                                 /* update our MTU size */
7533                                 if (mtu > (chk->send_size + omtu))
7534                                         mtu -= (chk->send_size + omtu);
7535                                 else
7536                                         mtu = 0;
7537                                 to_out += (chk->send_size + omtu);
7538                                 /* Do clear IP_DF ? */
7539                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7540                                         no_fragmentflg = 0;
7541                                 }
7542                                 if (chk->rec.chunk_id.can_take_data)
7543                                         chk->data = NULL;
7544                                 /*
7545                                  * set hb flag since we can use these for
7546                                  * RTO
7547                                  */
7548                                 hbflag = 1;
7549                                 asconf = 1;
7550                                 /*
7551                                  * should sysctl this: don't bundle data
7552                                  * with ASCONF since it requires AUTH
7553                                  */
7554                                 no_data_chunks = 1;
7555                                 chk->sent = SCTP_DATAGRAM_SENT;
7556                                 chk->snd_count++;
7557                                 if (mtu == 0) {
7558                                         /*
7559                                          * Ok we are out of room but we can
7560                                          * output without effecting the
7561                                          * flight size since this little guy
7562                                          * is a control only packet.
7563                                          */
7564                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7565                                         /*
7566                                          * do NOT clear the asconf flag as
7567                                          * it is used to do appropriate
7568                                          * source address selection.
7569                                          */
7570                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7571                                             (struct sockaddr *)&net->ro._l_addr,
7572                                             outchain, auth_offset, auth,
7573                                             stcb->asoc.authinfo.active_keyid,
7574                                             no_fragmentflg, 0, NULL, asconf,
7575                                             inp->sctp_lport, stcb->rport,
7576                                             htonl(stcb->asoc.peer_vtag),
7577                                             net->port, so_locked, NULL))) {
7578                                                 if (error == ENOBUFS) {
7579                                                         asoc->ifp_had_enobuf = 1;
7580                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7581                                                 }
7582                                                 if (from_where == 0) {
7583                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7584                                                 }
7585                                                 if (*now_filled == 0) {
7586                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7587                                                         *now_filled = 1;
7588                                                         *now = net->last_sent_time;
7589                                                 } else {
7590                                                         net->last_sent_time = *now;
7591                                                 }
7592                                                 hbflag = 0;
7593                                                 /* error, could not output */
7594                                                 if (error == EHOSTUNREACH) {
7595                                                         /*
7596                                                          * Destination went
7597                                                          * unreachable
7598                                                          * during this send
7599                                                          */
7600                                                         sctp_move_chunks_from_net(stcb, net);
7601                                                 }
7602                                                 *reason_code = 7;
7603                                                 continue;
7604                                         } else
7605                                                 asoc->ifp_had_enobuf = 0;
7606                                         if (*now_filled == 0) {
7607                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7608                                                 *now_filled = 1;
7609                                                 *now = net->last_sent_time;
7610                                         } else {
7611                                                 net->last_sent_time = *now;
7612                                         }
7613                                         hbflag = 0;
7614                                         /*
7615                                          * increase the number we sent, if a
7616                                          * cookie is sent we don't tell them
7617                                          * any was sent out.
7618                                          */
7619                                         outchain = endoutchain = NULL;
7620                                         auth = NULL;
7621                                         auth_offset = 0;
7622                                         if (!no_out_cnt)
7623                                                 *num_out += ctl_cnt;
7624                                         /* recalc a clean slate and setup */
7625                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7626                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7627                                         } else {
7628                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7629                                         }
7630                                         to_out = 0;
7631                                         no_fragmentflg = 1;
7632                                 }
7633                         }
7634                 }
7635                 /************************/
7636                 /* Control transmission */
7637                 /************************/
7638                 /* Now first lets go through the control queue */
7639                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7640                         if ((sack_goes_to) &&
7641                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
7642                             (chk->whoTo != sack_goes_to)) {
7643                                 /*
7644                                  * if we have a sack in queue, and we are
7645                                  * looking at an ecn echo that is NOT queued
7646                                  * to where the sack is going..
7647                                  */
7648                                 if (chk->whoTo == net) {
7649                                         /*
7650                                          * Don't transmit it to where its
7651                                          * going (current net)
7652                                          */
7653                                         continue;
7654                                 } else if (sack_goes_to == net) {
7655                                         /*
7656                                          * But do transmit it to this
7657                                          * address
7658                                          */
7659                                         goto skip_net_check;
7660                                 }
7661                         }
7662                         if (chk->whoTo != net) {
7663                                 /*
7664                                  * No, not sent to the network we are
7665                                  * looking at
7666                                  */
7667                                 continue;
7668                         }
7669         skip_net_check:
7670                         if (chk->data == NULL) {
7671                                 continue;
7672                         }
7673                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7674                                 /*
7675                                  * It must be unsent. Cookies and ASCONF's
7676                                  * hang around but there timers will force
7677                                  * when marked for resend.
7678                                  */
7679                                 continue;
7680                         }
7681                         /*
7682                          * if no AUTH is yet included and this chunk
7683                          * requires it, make sure to account for it.  We
7684                          * don't apply the size until the AUTH chunk is
7685                          * actually added below in case there is no room for
7686                          * this chunk. NOTE: we overload the use of "omtu"
7687                          * here
7688                          */
7689                         if ((auth == NULL) &&
7690                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7691                             stcb->asoc.peer_auth_chunks)) {
7692                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7693                         } else
7694                                 omtu = 0;
7695                         /* Here we do NOT factor the r_mtu */
7696                         if ((chk->send_size <= (int)(mtu - omtu)) ||
7697                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7698                                 /*
7699                                  * We probably should glom the mbuf chain
7700                                  * from the chk->data for control but the
7701                                  * problem is it becomes yet one more level
7702                                  * of tracking to do if for some reason
7703                                  * output fails. Then I have got to
7704                                  * reconstruct the merged control chain.. el
7705                                  * yucko.. for now we take the easy way and
7706                                  * do the copy
7707                                  */
7708                                 /*
7709                                  * Add an AUTH chunk, if chunk requires it
7710                                  * save the offset into the chain for AUTH
7711                                  */
7712                                 if ((auth == NULL) &&
7713                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7714                                     stcb->asoc.peer_auth_chunks))) {
7715                                         outchain = sctp_add_auth_chunk(outchain,
7716                                             &endoutchain,
7717                                             &auth,
7718                                             &auth_offset,
7719                                             stcb,
7720                                             chk->rec.chunk_id.id);
7721                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7722                                 }
7723                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7724                                     (int)chk->rec.chunk_id.can_take_data,
7725                                     chk->send_size, chk->copy_by_ref);
7726                                 if (outchain == NULL) {
7727                                         *reason_code = 8;
7728                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7729                                         return (ENOMEM);
7730                                 }
7731                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7732                                 /* update our MTU size */
7733                                 if (mtu > (chk->send_size + omtu))
7734                                         mtu -= (chk->send_size + omtu);
7735                                 else
7736                                         mtu = 0;
7737                                 to_out += (chk->send_size + omtu);
7738                                 /* Do clear IP_DF ? */
7739                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7740                                         no_fragmentflg = 0;
7741                                 }
7742                                 if (chk->rec.chunk_id.can_take_data)
7743                                         chk->data = NULL;
7744                                 /* Mark things to be removed, if needed */
7745                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7746                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7747                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7748                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7749                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7750                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7751                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7752                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7753                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7754                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7755                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7756
7757                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7758                                                 hbflag = 1;
7759                                                 /*
7760                                                  * JRS 5/14/07 - Set the
7761                                                  * flag to say a heartbeat
7762                                                  * is being sent.
7763                                                  */
7764                                                 pf_hbflag = 1;
7765                                         }
7766                                         /* remove these chunks at the end */
7767                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7768                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7769                                                 /* turn off the timer */
7770                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7771                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7772                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7773                                                 }
7774                                         }
7775                                         ctl_cnt++;
7776                                 } else {
7777                                         /*
7778                                          * Other chunks, since they have
7779                                          * timers running (i.e. COOKIE) we
7780                                          * just "trust" that it gets sent or
7781                                          * retransmitted.
7782                                          */
7783                                         ctl_cnt++;
7784                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7785                                                 cookie = 1;
7786                                                 no_out_cnt = 1;
7787                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7788                                                 /*
7789                                                  * Increment ecne send count
7790                                                  * here this means we may be
7791                                                  * over-zealous in our
7792                                                  * counting if the send
7793                                                  * fails, but its the best
7794                                                  * place to do it (we used
7795                                                  * to do it in the queue of
7796                                                  * the chunk, but that did
7797                                                  * not tell how many times
7798                                                  * it was sent.
7799                                                  */
7800                                                 SCTP_STAT_INCR(sctps_sendecne);
7801                                         }
7802                                         chk->sent = SCTP_DATAGRAM_SENT;
7803                                         chk->snd_count++;
7804                                 }
7805                                 if (mtu == 0) {
7806                                         /*
7807                                          * Ok we are out of room but we can
7808                                          * output without effecting the
7809                                          * flight size since this little guy
7810                                          * is a control only packet.
7811                                          */
7812                                         if (asconf) {
7813                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7814                                                 /*
7815                                                  * do NOT clear the asconf
7816                                                  * flag as it is used to do
7817                                                  * appropriate source
7818                                                  * address selection.
7819                                                  */
7820                                         }
7821                                         if (cookie) {
7822                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7823                                                 cookie = 0;
7824                                         }
7825                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7826                                             (struct sockaddr *)&net->ro._l_addr,
7827                                             outchain,
7828                                             auth_offset, auth,
7829                                             stcb->asoc.authinfo.active_keyid,
7830                                             no_fragmentflg, 0, NULL, asconf,
7831                                             inp->sctp_lport, stcb->rport,
7832                                             htonl(stcb->asoc.peer_vtag),
7833                                             net->port, so_locked, NULL))) {
7834                                                 if (error == ENOBUFS) {
7835                                                         asoc->ifp_had_enobuf = 1;
7836                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7837                                                 }
7838                                                 if (from_where == 0) {
7839                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7840                                                 }
7841                                                 /* error, could not output */
7842                                                 if (hbflag) {
7843                                                         if (*now_filled == 0) {
7844                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7845                                                                 *now_filled = 1;
7846                                                                 *now = net->last_sent_time;
7847                                                         } else {
7848                                                                 net->last_sent_time = *now;
7849                                                         }
7850                                                         hbflag = 0;
7851                                                 }
7852                                                 if (error == EHOSTUNREACH) {
7853                                                         /*
7854                                                          * Destination went
7855                                                          * unreachable
7856                                                          * during this send
7857                                                          */
7858                                                         sctp_move_chunks_from_net(stcb, net);
7859                                                 }
7860                                                 *reason_code = 7;
7861                                                 continue;
7862                                         } else
7863                                                 asoc->ifp_had_enobuf = 0;
7864                                         /* Only HB or ASCONF advances time */
7865                                         if (hbflag) {
7866                                                 if (*now_filled == 0) {
7867                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7868                                                         *now_filled = 1;
7869                                                         *now = net->last_sent_time;
7870                                                 } else {
7871                                                         net->last_sent_time = *now;
7872                                                 }
7873                                                 hbflag = 0;
7874                                         }
7875                                         /*
7876                                          * increase the number we sent, if a
7877                                          * cookie is sent we don't tell them
7878                                          * any was sent out.
7879                                          */
7880                                         outchain = endoutchain = NULL;
7881                                         auth = NULL;
7882                                         auth_offset = 0;
7883                                         if (!no_out_cnt)
7884                                                 *num_out += ctl_cnt;
7885                                         /* recalc a clean slate and setup */
7886                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7887                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7888                                         } else {
7889                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7890                                         }
7891                                         to_out = 0;
7892                                         no_fragmentflg = 1;
7893                                 }
7894                         }
7895                 }
7896                 /* JRI: if dest is in PF state, do not send data to it */
7897                 if ((asoc->sctp_cmt_on_off > 0) &&
7898                     (asoc->sctp_cmt_pf > 0) &&
7899                     (net->dest_state & SCTP_ADDR_PF)) {
7900                         goto no_data_fill;
7901                 }
7902                 if (net->flight_size >= net->cwnd) {
7903                         goto no_data_fill;
7904                 }
7905                 if ((asoc->sctp_cmt_on_off > 0) &&
7906                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
7907                     (net->flight_size > max_rwnd_per_dest)) {
7908                         goto no_data_fill;
7909                 }
7910                 /*
7911                  * We need a specific accounting for the usage of the send
7912                  * buffer. We also need to check the number of messages per
7913                  * net. For now, this is better than nothing and it disabled
7914                  * by default...
7915                  */
7916                 if ((asoc->sctp_cmt_on_off > 0) &&
7917                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
7918                     (max_send_per_dest > 0) &&
7919                     (net->flight_size > max_send_per_dest)) {
7920                         goto no_data_fill;
7921                 }
7922                 /*********************/
7923                 /* Data transmission */
7924                 /*********************/
7925                 /*
7926                  * if AUTH for DATA is required and no AUTH has been added
7927                  * yet, account for this in the mtu now... if no data can be
7928                  * bundled, this adjustment won't matter anyways since the
7929                  * packet will be going out...
7930                  */
7931                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
7932                     stcb->asoc.peer_auth_chunks);
7933                 if (data_auth_reqd && (auth == NULL)) {
7934                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7935                 }
7936                 /* now lets add any data within the MTU constraints */
7937                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7938                 case AF_INET:
7939                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
7940                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7941                         else
7942                                 omtu = 0;
7943                         break;
7944 #ifdef INET6
7945                 case AF_INET6:
7946                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
7947                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7948                         else
7949                                 omtu = 0;
7950                         break;
7951 #endif
7952                 default:
7953                         /* TSNH */
7954                         omtu = 0;
7955                         break;
7956                 }
7957                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
7958                     (skip_data_for_this_net == 0)) ||
7959                     (cookie)) {
7960                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
7961                                 if (no_data_chunks) {
7962                                         /* let only control go out */
7963                                         *reason_code = 1;
7964                                         break;
7965                                 }
7966                                 if (net->flight_size >= net->cwnd) {
7967                                         /* skip this net, no room for data */
7968                                         *reason_code = 2;
7969                                         break;
7970                                 }
7971                                 if ((chk->whoTo != NULL) &&
7972                                     (chk->whoTo != net)) {
7973                                         /* Don't send the chunk on this net */
7974                                         continue;
7975                                 }
7976                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
7977                                         /*-
7978                                          * strange, we have a chunk that is
7979                                          * to big for its destination and
7980                                          * yet no fragment ok flag.
7981                                          * Something went wrong when the
7982                                          * PMTU changed...we did not mark
7983                                          * this chunk for some reason?? I
7984                                          * will fix it here by letting IP
7985                                          * fragment it for now and printing
7986                                          * a warning. This really should not
7987                                          * happen ...
7988                                          */
7989                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
7990                                             chk->send_size, mtu);
7991                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
7992                                 }
7993                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7994                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
7995                                         struct sctp_data_chunk *dchkh;
7996
7997                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7998                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7999                                 }
8000                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8001                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8002                                         /* ok we will add this one */
8003
8004                                         /*
8005                                          * Add an AUTH chunk, if chunk
8006                                          * requires it, save the offset into
8007                                          * the chain for AUTH
8008                                          */
8009                                         if (data_auth_reqd) {
8010                                                 if (auth == NULL) {
8011                                                         outchain = sctp_add_auth_chunk(outchain,
8012                                                             &endoutchain,
8013                                                             &auth,
8014                                                             &auth_offset,
8015                                                             stcb,
8016                                                             SCTP_DATA);
8017                                                         auth_keyid = chk->auth_keyid;
8018                                                         override_ok = 0;
8019                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8020                                                 } else if (override_ok) {
8021                                                         /*
8022                                                          * use this data's
8023                                                          * keyid
8024                                                          */
8025                                                         auth_keyid = chk->auth_keyid;
8026                                                         override_ok = 0;
8027                                                 } else if (auth_keyid != chk->auth_keyid) {
8028                                                         /*
8029                                                          * different keyid,
8030                                                          * so done bundling
8031                                                          */
8032                                                         break;
8033                                                 }
8034                                         }
8035                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8036                                             chk->send_size, chk->copy_by_ref);
8037                                         if (outchain == NULL) {
8038                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8039                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8040                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8041                                                 }
8042                                                 *reason_code = 3;
8043                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8044                                                 return (ENOMEM);
8045                                         }
8046                                         /* upate our MTU size */
8047                                         /* Do clear IP_DF ? */
8048                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8049                                                 no_fragmentflg = 0;
8050                                         }
8051                                         /* unsigned subtraction of mtu */
8052                                         if (mtu > chk->send_size)
8053                                                 mtu -= chk->send_size;
8054                                         else
8055                                                 mtu = 0;
8056                                         /* unsigned subtraction of r_mtu */
8057                                         if (r_mtu > chk->send_size)
8058                                                 r_mtu -= chk->send_size;
8059                                         else
8060                                                 r_mtu = 0;
8061
8062                                         to_out += chk->send_size;
8063                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8064 #ifdef INVARIANTS
8065                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8066 #else
8067                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8068                                                     mx_mtu, to_out);
8069 #endif
8070                                         }
8071                                         chk->window_probe = 0;
8072                                         data_list[bundle_at++] = chk;
8073                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8074                                                 mtu = 0;
8075                                                 break;
8076                                         }
8077                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8078                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8079                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8080                                                 } else {
8081                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8082                                                 }
8083                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8084                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8085                                                         /*
8086                                                          * Count number of
8087                                                          * user msg's that
8088                                                          * were fragmented
8089                                                          * we do this by
8090                                                          * counting when we
8091                                                          * see a LAST
8092                                                          * fragment only.
8093                                                          */
8094                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8095                                         }
8096                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8097                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8098                                                         data_list[0]->window_probe = 1;
8099                                                         net->window_probe = 1;
8100                                                 }
8101                                                 break;
8102                                         }
8103                                 } else {
8104                                         /*
8105                                          * Must be sent in order of the
8106                                          * TSN's (on a network)
8107                                          */
8108                                         break;
8109                                 }
8110                         }       /* for (chunk gather loop for this net) */
8111                 }               /* if asoc.state OPEN */
8112 no_data_fill:
8113                 /* Is there something to send for this destination? */
8114                 if (outchain) {
8115                         /* We may need to start a control timer or two */
8116                         if (asconf) {
8117                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8118                                     stcb, net);
8119                                 /*
8120                                  * do NOT clear the asconf flag as it is
8121                                  * used to do appropriate source address
8122                                  * selection.
8123                                  */
8124                         }
8125                         if (cookie) {
8126                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8127                                 cookie = 0;
8128                         }
8129                         /* must start a send timer if data is being sent */
8130                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8131                                 /*
8132                                  * no timer running on this destination
8133                                  * restart it.
8134                                  */
8135                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8136                         } else if ((asoc->sctp_cmt_on_off > 0) &&
8137                                     (asoc->sctp_cmt_pf > 0) &&
8138                                     pf_hbflag &&
8139                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8140                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8141                                 /*
8142                                  * JRS 5/14/07 - If a HB has been sent to a
8143                                  * PF destination and no T3 timer is
8144                                  * currently running, start the T3 timer to
8145                                  * track the HBs that were sent.
8146                                  */
8147                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8148                         }
8149                         /* Now send it, if there is anything to send :> */
8150                         if ((error = sctp_lowlevel_chunk_output(inp,
8151                             stcb,
8152                             net,
8153                             (struct sockaddr *)&net->ro._l_addr,
8154                             outchain,
8155                             auth_offset,
8156                             auth,
8157                             auth_keyid,
8158                             no_fragmentflg,
8159                             bundle_at,
8160                             data_list[0],
8161                             asconf,
8162                             inp->sctp_lport, stcb->rport,
8163                             htonl(stcb->asoc.peer_vtag),
8164                             net->port, so_locked, NULL))) {
8165                                 /* error, we could not output */
8166                                 if (error == ENOBUFS) {
8167                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8168                                         asoc->ifp_had_enobuf = 1;
8169                                 }
8170                                 if (from_where == 0) {
8171                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8172                                 }
8173                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8174                                 if (hbflag) {
8175                                         if (*now_filled == 0) {
8176                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8177                                                 *now_filled = 1;
8178                                                 *now = net->last_sent_time;
8179                                         } else {
8180                                                 net->last_sent_time = *now;
8181                                         }
8182                                         hbflag = 0;
8183                                 }
8184                                 if (error == EHOSTUNREACH) {
8185                                         /*
8186                                          * Destination went unreachable
8187                                          * during this send
8188                                          */
8189                                         sctp_move_chunks_from_net(stcb, net);
8190                                 }
8191                                 *reason_code = 6;
8192                                 /*-
8193                                  * I add this line to be paranoid. As far as
8194                                  * I can tell the continue, takes us back to
8195                                  * the top of the for, but just to make sure
8196                                  * I will reset these again here.
8197                                  */
8198                                 ctl_cnt = bundle_at = 0;
8199                                 continue;       /* This takes us back to the
8200                                                  * for() for the nets. */
8201                         } else {
8202                                 asoc->ifp_had_enobuf = 0;
8203                         }
8204                         outchain = endoutchain = NULL;
8205                         auth = NULL;
8206                         auth_offset = 0;
8207                         if (bundle_at || hbflag) {
8208                                 /* For data/asconf and hb set time */
8209                                 if (*now_filled == 0) {
8210                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8211                                         *now_filled = 1;
8212                                         *now = net->last_sent_time;
8213                                 } else {
8214                                         net->last_sent_time = *now;
8215                                 }
8216                         }
8217                         if (!no_out_cnt) {
8218                                 *num_out += (ctl_cnt + bundle_at);
8219                         }
8220                         if (bundle_at) {
8221                                 /* setup for a RTO measurement */
8222                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8223                                 /* fill time if not already filled */
8224                                 if (*now_filled == 0) {
8225                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8226                                         *now_filled = 1;
8227                                         *now = asoc->time_last_sent;
8228                                 } else {
8229                                         asoc->time_last_sent = *now;
8230                                 }
8231                                 data_list[0]->do_rtt = 1;
8232                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8233                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8234                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8235                                         if (net->flight_size < net->cwnd) {
8236                                                 /* start or restart it */
8237                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8238                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8239                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8240                                                 }
8241                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8242                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8243                                         } else {
8244                                                 /* stop it if its running */
8245                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8246                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8247                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8248                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8249                                                 }
8250                                         }
8251                                 }
8252                         }
8253                         if (one_chunk) {
8254                                 break;
8255                         }
8256                 }
8257                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8258                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8259                 }
8260         }
8261         if (old_start_at == NULL) {
8262                 old_start_at = start_at;
8263                 start_at = TAILQ_FIRST(&asoc->nets);
8264                 if (old_start_at)
8265                         goto again_one_more_time;
8266         }
8267         /*
8268          * At the end there should be no NON timed chunks hanging on this
8269          * queue.
8270          */
8271         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8272                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8273         }
8274         if ((*num_out == 0) && (*reason_code == 0)) {
8275                 *reason_code = 4;
8276         } else {
8277                 *reason_code = 5;
8278         }
8279         sctp_clean_up_ctl(stcb, asoc);
8280         return (0);
8281 }
8282
8283 void
8284 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8285 {
8286         /*-
8287          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8288          * the control chunk queue.
8289          */
8290         struct sctp_chunkhdr *hdr;
8291         struct sctp_tmit_chunk *chk;
8292         struct mbuf *mat;
8293
8294         SCTP_TCB_LOCK_ASSERT(stcb);
8295         sctp_alloc_a_chunk(stcb, chk);
8296         if (chk == NULL) {
8297                 /* no memory */
8298                 sctp_m_freem(op_err);
8299                 return;
8300         }
8301         chk->copy_by_ref = 0;
8302         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8303         if (op_err == NULL) {
8304                 sctp_free_a_chunk(stcb, chk);
8305                 return;
8306         }
8307         chk->send_size = 0;
8308         mat = op_err;
8309         while (mat != NULL) {
8310                 chk->send_size += SCTP_BUF_LEN(mat);
8311                 mat = SCTP_BUF_NEXT(mat);
8312         }
8313         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8314         chk->rec.chunk_id.can_take_data = 1;
8315         chk->sent = SCTP_DATAGRAM_UNSENT;
8316         chk->snd_count = 0;
8317         chk->flags = 0;
8318         chk->asoc = &stcb->asoc;
8319         chk->data = op_err;
8320         chk->whoTo = chk->asoc->primary_destination;
8321         atomic_add_int(&chk->whoTo->ref_count, 1);
8322         hdr = mtod(op_err, struct sctp_chunkhdr *);
8323         hdr->chunk_type = SCTP_OPERATION_ERROR;
8324         hdr->chunk_flags = 0;
8325         hdr->chunk_length = htons(chk->send_size);
8326         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8327             chk,
8328             sctp_next);
8329         chk->asoc->ctrl_queue_cnt++;
8330 }
8331
8332 int
8333 sctp_send_cookie_echo(struct mbuf *m,
8334     int offset,
8335     struct sctp_tcb *stcb,
8336     struct sctp_nets *net)
8337 {
8338         /*-
8339          * pull out the cookie and put it at the front of the control chunk
8340          * queue.
8341          */
8342         int at;
8343         struct mbuf *cookie;
8344         struct sctp_paramhdr parm, *phdr;
8345         struct sctp_chunkhdr *hdr;
8346         struct sctp_tmit_chunk *chk;
8347         uint16_t ptype, plen;
8348
8349         /* First find the cookie in the param area */
8350         cookie = NULL;
8351         at = offset + sizeof(struct sctp_init_chunk);
8352
8353         SCTP_TCB_LOCK_ASSERT(stcb);
8354         do {
8355                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8356                 if (phdr == NULL) {
8357                         return (-3);
8358                 }
8359                 ptype = ntohs(phdr->param_type);
8360                 plen = ntohs(phdr->param_length);
8361                 if (ptype == SCTP_STATE_COOKIE) {
8362                         int pad;
8363
8364                         /* found the cookie */
8365                         if ((pad = (plen % 4))) {
8366                                 plen += 4 - pad;
8367                         }
8368                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8369                         if (cookie == NULL) {
8370                                 /* No memory */
8371                                 return (-2);
8372                         }
8373 #ifdef SCTP_MBUF_LOGGING
8374                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8375                                 struct mbuf *mat;
8376
8377                                 mat = cookie;
8378                                 while (mat) {
8379                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8380                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8381                                         }
8382                                         mat = SCTP_BUF_NEXT(mat);
8383                                 }
8384                         }
8385 #endif
8386                         break;
8387                 }
8388                 at += SCTP_SIZE32(plen);
8389         } while (phdr);
8390         if (cookie == NULL) {
8391                 /* Did not find the cookie */
8392                 return (-3);
8393         }
8394         /* ok, we got the cookie lets change it into a cookie echo chunk */
8395
8396         /* first the change from param to cookie */
8397         hdr = mtod(cookie, struct sctp_chunkhdr *);
8398         hdr->chunk_type = SCTP_COOKIE_ECHO;
8399         hdr->chunk_flags = 0;
8400         /* get the chunk stuff now and place it in the FRONT of the queue */
8401         sctp_alloc_a_chunk(stcb, chk);
8402         if (chk == NULL) {
8403                 /* no memory */
8404                 sctp_m_freem(cookie);
8405                 return (-5);
8406         }
8407         chk->copy_by_ref = 0;
8408         chk->send_size = plen;
8409         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8410         chk->rec.chunk_id.can_take_data = 0;
8411         chk->sent = SCTP_DATAGRAM_UNSENT;
8412         chk->snd_count = 0;
8413         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8414         chk->asoc = &stcb->asoc;
8415         chk->data = cookie;
8416         chk->whoTo = chk->asoc->primary_destination;
8417         atomic_add_int(&chk->whoTo->ref_count, 1);
8418         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8419         chk->asoc->ctrl_queue_cnt++;
8420         return (0);
8421 }
8422
8423 void
8424 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8425     struct mbuf *m,
8426     int offset,
8427     int chk_length,
8428     struct sctp_nets *net)
8429 {
8430         /*
8431          * take a HB request and make it into a HB ack and send it.
8432          */
8433         struct mbuf *outchain;
8434         struct sctp_chunkhdr *chdr;
8435         struct sctp_tmit_chunk *chk;
8436
8437
8438         if (net == NULL)
8439                 /* must have a net pointer */
8440                 return;
8441
8442         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8443         if (outchain == NULL) {
8444                 /* gak out of memory */
8445                 return;
8446         }
8447 #ifdef SCTP_MBUF_LOGGING
8448         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8449                 struct mbuf *mat;
8450
8451                 mat = outchain;
8452                 while (mat) {
8453                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8454                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8455                         }
8456                         mat = SCTP_BUF_NEXT(mat);
8457                 }
8458         }
8459 #endif
8460         chdr = mtod(outchain, struct sctp_chunkhdr *);
8461         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8462         chdr->chunk_flags = 0;
8463         if (chk_length % 4) {
8464                 /* need pad */
8465                 uint32_t cpthis = 0;
8466                 int padlen;
8467
8468                 padlen = 4 - (chk_length % 4);
8469                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8470         }
8471         sctp_alloc_a_chunk(stcb, chk);
8472         if (chk == NULL) {
8473                 /* no memory */
8474                 sctp_m_freem(outchain);
8475                 return;
8476         }
8477         chk->copy_by_ref = 0;
8478         chk->send_size = chk_length;
8479         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8480         chk->rec.chunk_id.can_take_data = 1;
8481         chk->sent = SCTP_DATAGRAM_UNSENT;
8482         chk->snd_count = 0;
8483         chk->flags = 0;
8484         chk->asoc = &stcb->asoc;
8485         chk->data = outchain;
8486         chk->whoTo = net;
8487         atomic_add_int(&chk->whoTo->ref_count, 1);
8488         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8489         chk->asoc->ctrl_queue_cnt++;
8490 }
8491
8492 void
8493 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8494 {
8495         /* formulate and queue a cookie-ack back to sender */
8496         struct mbuf *cookie_ack;
8497         struct sctp_chunkhdr *hdr;
8498         struct sctp_tmit_chunk *chk;
8499
8500         cookie_ack = NULL;
8501         SCTP_TCB_LOCK_ASSERT(stcb);
8502
8503         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8504         if (cookie_ack == NULL) {
8505                 /* no mbuf's */
8506                 return;
8507         }
8508         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8509         sctp_alloc_a_chunk(stcb, chk);
8510         if (chk == NULL) {
8511                 /* no memory */
8512                 sctp_m_freem(cookie_ack);
8513                 return;
8514         }
8515         chk->copy_by_ref = 0;
8516         chk->send_size = sizeof(struct sctp_chunkhdr);
8517         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8518         chk->rec.chunk_id.can_take_data = 1;
8519         chk->sent = SCTP_DATAGRAM_UNSENT;
8520         chk->snd_count = 0;
8521         chk->flags = 0;
8522         chk->asoc = &stcb->asoc;
8523         chk->data = cookie_ack;
8524         if (chk->asoc->last_control_chunk_from != NULL) {
8525                 chk->whoTo = chk->asoc->last_control_chunk_from;
8526         } else {
8527                 chk->whoTo = chk->asoc->primary_destination;
8528         }
8529         atomic_add_int(&chk->whoTo->ref_count, 1);
8530         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8531         hdr->chunk_type = SCTP_COOKIE_ACK;
8532         hdr->chunk_flags = 0;
8533         hdr->chunk_length = htons(chk->send_size);
8534         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8535         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8536         chk->asoc->ctrl_queue_cnt++;
8537         return;
8538 }
8539
8540
8541 void
8542 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8543 {
8544         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8545         struct mbuf *m_shutdown_ack;
8546         struct sctp_shutdown_ack_chunk *ack_cp;
8547         struct sctp_tmit_chunk *chk;
8548
8549         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8550         if (m_shutdown_ack == NULL) {
8551                 /* no mbuf's */
8552                 return;
8553         }
8554         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8555         sctp_alloc_a_chunk(stcb, chk);
8556         if (chk == NULL) {
8557                 /* no memory */
8558                 sctp_m_freem(m_shutdown_ack);
8559                 return;
8560         }
8561         chk->copy_by_ref = 0;
8562         chk->send_size = sizeof(struct sctp_chunkhdr);
8563         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8564         chk->rec.chunk_id.can_take_data = 1;
8565         chk->sent = SCTP_DATAGRAM_UNSENT;
8566         chk->snd_count = 0;
8567         chk->flags = 0;
8568         chk->asoc = &stcb->asoc;
8569         chk->data = m_shutdown_ack;
8570         chk->whoTo = net;
8571         atomic_add_int(&net->ref_count, 1);
8572
8573         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8574         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8575         ack_cp->ch.chunk_flags = 0;
8576         ack_cp->ch.chunk_length = htons(chk->send_size);
8577         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8578         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8579         chk->asoc->ctrl_queue_cnt++;
8580         return;
8581 }
8582
8583 void
8584 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8585 {
8586         /* formulate and queue a SHUTDOWN to the sender */
8587         struct mbuf *m_shutdown;
8588         struct sctp_shutdown_chunk *shutdown_cp;
8589         struct sctp_tmit_chunk *chk;
8590
8591         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8592         if (m_shutdown == NULL) {
8593                 /* no mbuf's */
8594                 return;
8595         }
8596         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8597         sctp_alloc_a_chunk(stcb, chk);
8598         if (chk == NULL) {
8599                 /* no memory */
8600                 sctp_m_freem(m_shutdown);
8601                 return;
8602         }
8603         chk->copy_by_ref = 0;
8604         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8605         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8606         chk->rec.chunk_id.can_take_data = 1;
8607         chk->sent = SCTP_DATAGRAM_UNSENT;
8608         chk->snd_count = 0;
8609         chk->flags = 0;
8610         chk->asoc = &stcb->asoc;
8611         chk->data = m_shutdown;
8612         chk->whoTo = net;
8613         atomic_add_int(&net->ref_count, 1);
8614
8615         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8616         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8617         shutdown_cp->ch.chunk_flags = 0;
8618         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8619         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8620         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8621         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8622         chk->asoc->ctrl_queue_cnt++;
8623         return;
8624 }
8625
8626 void
8627 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8628 {
8629         /*
8630          * formulate and queue an ASCONF to the peer. ASCONF parameters
8631          * should be queued on the assoc queue.
8632          */
8633         struct sctp_tmit_chunk *chk;
8634         struct mbuf *m_asconf;
8635         int len;
8636
8637         SCTP_TCB_LOCK_ASSERT(stcb);
8638
8639         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8640             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8641                 /* can't send a new one if there is one in flight already */
8642                 return;
8643         }
8644         /* compose an ASCONF chunk, maximum length is PMTU */
8645         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8646         if (m_asconf == NULL) {
8647                 return;
8648         }
8649         sctp_alloc_a_chunk(stcb, chk);
8650         if (chk == NULL) {
8651                 /* no memory */
8652                 sctp_m_freem(m_asconf);
8653                 return;
8654         }
8655         chk->copy_by_ref = 0;
8656         chk->data = m_asconf;
8657         chk->send_size = len;
8658         chk->rec.chunk_id.id = SCTP_ASCONF;
8659         chk->rec.chunk_id.can_take_data = 0;
8660         chk->sent = SCTP_DATAGRAM_UNSENT;
8661         chk->snd_count = 0;
8662         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8663         chk->asoc = &stcb->asoc;
8664         chk->whoTo = net;
8665         atomic_add_int(&chk->whoTo->ref_count, 1);
8666         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8667         chk->asoc->ctrl_queue_cnt++;
8668         return;
8669 }
8670
8671 void
8672 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8673 {
8674         /*
8675          * formulate and queue a asconf-ack back to sender. the asconf-ack
8676          * must be stored in the tcb.
8677          */
8678         struct sctp_tmit_chunk *chk;
8679         struct sctp_asconf_ack *ack, *latest_ack;
8680         struct mbuf *m_ack, *m;
8681         struct sctp_nets *net = NULL;
8682
8683         SCTP_TCB_LOCK_ASSERT(stcb);
8684         /* Get the latest ASCONF-ACK */
8685         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8686         if (latest_ack == NULL) {
8687                 return;
8688         }
8689         if (latest_ack->last_sent_to != NULL &&
8690             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8691                 /* we're doing a retransmission */
8692                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8693                 if (net == NULL) {
8694                         /* no alternate */
8695                         if (stcb->asoc.last_control_chunk_from == NULL)
8696                                 net = stcb->asoc.primary_destination;
8697                         else
8698                                 net = stcb->asoc.last_control_chunk_from;
8699                 }
8700         } else {
8701                 /* normal case */
8702                 if (stcb->asoc.last_control_chunk_from == NULL)
8703                         net = stcb->asoc.primary_destination;
8704                 else
8705                         net = stcb->asoc.last_control_chunk_from;
8706         }
8707         latest_ack->last_sent_to = net;
8708
8709         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8710                 if (ack->data == NULL) {
8711                         continue;
8712                 }
8713                 /* copy the asconf_ack */
8714                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8715                 if (m_ack == NULL) {
8716                         /* couldn't copy it */
8717                         return;
8718                 }
8719 #ifdef SCTP_MBUF_LOGGING
8720                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8721                         struct mbuf *mat;
8722
8723                         mat = m_ack;
8724                         while (mat) {
8725                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8726                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8727                                 }
8728                                 mat = SCTP_BUF_NEXT(mat);
8729                         }
8730                 }
8731 #endif
8732
8733                 sctp_alloc_a_chunk(stcb, chk);
8734                 if (chk == NULL) {
8735                         /* no memory */
8736                         if (m_ack)
8737                                 sctp_m_freem(m_ack);
8738                         return;
8739                 }
8740                 chk->copy_by_ref = 0;
8741
8742                 chk->whoTo = net;
8743                 chk->data = m_ack;
8744                 chk->send_size = 0;
8745                 /* Get size */
8746                 m = m_ack;
8747                 chk->send_size = ack->len;
8748                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8749                 chk->rec.chunk_id.can_take_data = 1;
8750                 chk->sent = SCTP_DATAGRAM_UNSENT;
8751                 chk->snd_count = 0;
8752                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8753                 chk->asoc = &stcb->asoc;
8754                 atomic_add_int(&chk->whoTo->ref_count, 1);
8755
8756                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8757                 chk->asoc->ctrl_queue_cnt++;
8758         }
8759         return;
8760 }
8761
8762
8763 static int
8764 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8765     struct sctp_tcb *stcb,
8766     struct sctp_association *asoc,
8767     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8768 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8769     SCTP_UNUSED
8770 #endif
8771 )
8772 {
8773         /*-
8774          * send out one MTU of retransmission. If fast_retransmit is
8775          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8776          * rwnd. For a Cookie or Asconf in the control chunk queue we
8777          * retransmit them by themselves.
8778          *
8779          * For data chunks we will pick out the lowest TSN's in the sent_queue
8780          * marked for resend and bundle them all together (up to a MTU of
8781          * destination). The address to send to should have been
8782          * selected/changed where the retransmission was marked (i.e. in FR
8783          * or t3-timeout routines).
8784          */
8785         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8786         struct sctp_tmit_chunk *chk, *fwd;
8787         struct mbuf *m, *endofchain;
8788         struct sctp_nets *net = NULL;
8789         uint32_t tsns_sent = 0;
8790         int no_fragmentflg, bundle_at, cnt_thru;
8791         unsigned int mtu;
8792         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8793         struct sctp_auth_chunk *auth = NULL;
8794         uint32_t auth_offset = 0;
8795         uint16_t auth_keyid;
8796         int override_ok = 1;
8797         int data_auth_reqd = 0;
8798         uint32_t dmtu = 0;
8799
8800         SCTP_TCB_LOCK_ASSERT(stcb);
8801         tmr_started = ctl_cnt = bundle_at = error = 0;
8802         no_fragmentflg = 1;
8803         fwd_tsn = 0;
8804         *cnt_out = 0;
8805         fwd = NULL;
8806         endofchain = m = NULL;
8807         auth_keyid = stcb->asoc.authinfo.active_keyid;
8808 #ifdef SCTP_AUDITING_ENABLED
8809         sctp_audit_log(0xC3, 1);
8810 #endif
8811         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8812             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8813                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8814                     asoc->sent_queue_retran_cnt);
8815                 asoc->sent_queue_cnt = 0;
8816                 asoc->sent_queue_cnt_removeable = 0;
8817                 /* send back 0/0 so we enter normal transmission */
8818                 *cnt_out = 0;
8819                 return (0);
8820         }
8821         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8822                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8823                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8824                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8825                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8826                                 continue;
8827                         }
8828                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8829                                 if (chk != asoc->str_reset) {
8830                                         /*
8831                                          * not eligible for retran if its
8832                                          * not ours
8833                                          */
8834                                         continue;
8835                                 }
8836                         }
8837                         ctl_cnt++;
8838                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8839                                 fwd_tsn = 1;
8840                                 fwd = chk;
8841                         }
8842                         /*
8843                          * Add an AUTH chunk, if chunk requires it save the
8844                          * offset into the chain for AUTH
8845                          */
8846                         if ((auth == NULL) &&
8847                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8848                             stcb->asoc.peer_auth_chunks))) {
8849                                 m = sctp_add_auth_chunk(m, &endofchain,
8850                                     &auth, &auth_offset,
8851                                     stcb,
8852                                     chk->rec.chunk_id.id);
8853                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8854                         }
8855                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8856                         break;
8857                 }
8858         }
8859         one_chunk = 0;
8860         cnt_thru = 0;
8861         /* do we have control chunks to retransmit? */
8862         if (m != NULL) {
8863                 /* Start a timer no matter if we suceed or fail */
8864                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8865                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8866                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8867                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8868                 chk->snd_count++;       /* update our count */
8869                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8870                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
8871                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
8872                     no_fragmentflg, 0, NULL, 0,
8873                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
8874                     chk->whoTo->port, so_locked, NULL))) {
8875                         SCTP_STAT_INCR(sctps_lowlevelerr);
8876                         return (error);
8877                 }
8878                 m = endofchain = NULL;
8879                 auth = NULL;
8880                 auth_offset = 0;
8881                 /*
8882                  * We don't want to mark the net->sent time here since this
8883                  * we use this for HB and retrans cannot measure RTT
8884                  */
8885                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8886                 *cnt_out += 1;
8887                 chk->sent = SCTP_DATAGRAM_SENT;
8888                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
8889                 if (fwd_tsn == 0) {
8890                         return (0);
8891                 } else {
8892                         /* Clean up the fwd-tsn list */
8893                         sctp_clean_up_ctl(stcb, asoc);
8894                         return (0);
8895                 }
8896         }
8897         /*
8898          * Ok, it is just data retransmission we need to do or that and a
8899          * fwd-tsn with it all.
8900          */
8901         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8902                 return (SCTP_RETRAN_DONE);
8903         }
8904         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8905             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8906                 /* not yet open, resend the cookie and that is it */
8907                 return (1);
8908         }
8909 #ifdef SCTP_AUDITING_ENABLED
8910         sctp_auditing(20, inp, stcb, NULL);
8911 #endif
8912         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
8913         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8914                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8915                         /* No, not sent to this net or not ready for rtx */
8916                         continue;
8917                 }
8918                 if (chk->data == NULL) {
8919                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
8920                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
8921                         continue;
8922                 }
8923                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
8924                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
8925                         /* Gak, we have exceeded max unlucky retran, abort! */
8926                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8927                             chk->snd_count,
8928                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
8929                         atomic_add_int(&stcb->asoc.refcnt, 1);
8930                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8931                         SCTP_TCB_LOCK(stcb);
8932                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8933                         return (SCTP_RETRAN_EXIT);
8934                 }
8935                 /* pick up the net */
8936                 net = chk->whoTo;
8937                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8938                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8939                 } else {
8940                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8941                 }
8942
8943                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8944                         /* No room in peers rwnd */
8945                         uint32_t tsn;
8946
8947                         tsn = asoc->last_acked_seq + 1;
8948                         if (tsn == chk->rec.data.TSN_seq) {
8949                                 /*
8950                                  * we make a special exception for this
8951                                  * case. The peer has no rwnd but is missing
8952                                  * the lowest chunk.. which is probably what
8953                                  * is holding up the rwnd.
8954                                  */
8955                                 goto one_chunk_around;
8956                         }
8957                         return (1);
8958                 }
8959 one_chunk_around:
8960                 if (asoc->peers_rwnd < mtu) {
8961                         one_chunk = 1;
8962                         if ((asoc->peers_rwnd == 0) &&
8963                             (asoc->total_flight == 0)) {
8964                                 chk->window_probe = 1;
8965                                 chk->whoTo->window_probe = 1;
8966                         }
8967                 }
8968 #ifdef SCTP_AUDITING_ENABLED
8969                 sctp_audit_log(0xC3, 2);
8970 #endif
8971                 bundle_at = 0;
8972                 m = NULL;
8973                 net->fast_retran_ip = 0;
8974                 if (chk->rec.data.doing_fast_retransmit == 0) {
8975                         /*
8976                          * if no FR in progress skip destination that have
8977                          * flight_size > cwnd.
8978                          */
8979                         if (net->flight_size >= net->cwnd) {
8980                                 continue;
8981                         }
8982                 } else {
8983                         /*
8984                          * Mark the destination net to have FR recovery
8985                          * limits put on it.
8986                          */
8987                         *fr_done = 1;
8988                         net->fast_retran_ip = 1;
8989                 }
8990
8991                 /*
8992                  * if no AUTH is yet included and this chunk requires it,
8993                  * make sure to account for it.  We don't apply the size
8994                  * until the AUTH chunk is actually added below in case
8995                  * there is no room for this chunk.
8996                  */
8997                 if (data_auth_reqd && (auth == NULL)) {
8998                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8999                 } else
9000                         dmtu = 0;
9001
9002                 if ((chk->send_size <= (mtu - dmtu)) ||
9003                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9004                         /* ok we will add this one */
9005                         if (data_auth_reqd) {
9006                                 if (auth == NULL) {
9007                                         m = sctp_add_auth_chunk(m,
9008                                             &endofchain,
9009                                             &auth,
9010                                             &auth_offset,
9011                                             stcb,
9012                                             SCTP_DATA);
9013                                         auth_keyid = chk->auth_keyid;
9014                                         override_ok = 0;
9015                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9016                                 } else if (override_ok) {
9017                                         auth_keyid = chk->auth_keyid;
9018                                         override_ok = 0;
9019                                 } else if (chk->auth_keyid != auth_keyid) {
9020                                         /* different keyid, so done bundling */
9021                                         break;
9022                                 }
9023                         }
9024                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9025                         if (m == NULL) {
9026                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9027                                 return (ENOMEM);
9028                         }
9029                         /* Do clear IP_DF ? */
9030                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9031                                 no_fragmentflg = 0;
9032                         }
9033                         /* upate our MTU size */
9034                         if (mtu > (chk->send_size + dmtu))
9035                                 mtu -= (chk->send_size + dmtu);
9036                         else
9037                                 mtu = 0;
9038                         data_list[bundle_at++] = chk;
9039                         if (one_chunk && (asoc->total_flight <= 0)) {
9040                                 SCTP_STAT_INCR(sctps_windowprobed);
9041                         }
9042                 }
9043                 if (one_chunk == 0) {
9044                         /*
9045                          * now are there anymore forward from chk to pick
9046                          * up?
9047                          */
9048                         fwd = TAILQ_NEXT(chk, sctp_next);
9049                         while (fwd) {
9050                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9051                                         /* Nope, not for retran */
9052                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9053                                         continue;
9054                                 }
9055                                 if (fwd->whoTo != net) {
9056                                         /* Nope, not the net in question */
9057                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9058                                         continue;
9059                                 }
9060                                 if (data_auth_reqd && (auth == NULL)) {
9061                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9062                                 } else
9063                                         dmtu = 0;
9064                                 if (fwd->send_size <= (mtu - dmtu)) {
9065                                         if (data_auth_reqd) {
9066                                                 if (auth == NULL) {
9067                                                         m = sctp_add_auth_chunk(m,
9068                                                             &endofchain,
9069                                                             &auth,
9070                                                             &auth_offset,
9071                                                             stcb,
9072                                                             SCTP_DATA);
9073                                                         auth_keyid = fwd->auth_keyid;
9074                                                         override_ok = 0;
9075                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9076                                                 } else if (override_ok) {
9077                                                         auth_keyid = fwd->auth_keyid;
9078                                                         override_ok = 0;
9079                                                 } else if (fwd->auth_keyid != auth_keyid) {
9080                                                         /*
9081                                                          * different keyid,
9082                                                          * so done bundling
9083                                                          */
9084                                                         break;
9085                                                 }
9086                                         }
9087                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9088                                         if (m == NULL) {
9089                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9090                                                 return (ENOMEM);
9091                                         }
9092                                         /* Do clear IP_DF ? */
9093                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9094                                                 no_fragmentflg = 0;
9095                                         }
9096                                         /* upate our MTU size */
9097                                         if (mtu > (fwd->send_size + dmtu))
9098                                                 mtu -= (fwd->send_size + dmtu);
9099                                         else
9100                                                 mtu = 0;
9101                                         data_list[bundle_at++] = fwd;
9102                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9103                                                 break;
9104                                         }
9105                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9106                                 } else {
9107                                         /* can't fit so we are done */
9108                                         break;
9109                                 }
9110                         }
9111                 }
9112                 /* Is there something to send for this destination? */
9113                 if (m) {
9114                         /*
9115                          * No matter if we fail/or suceed we should start a
9116                          * timer. A failure is like a lost IP packet :-)
9117                          */
9118                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9119                                 /*
9120                                  * no timer running on this destination
9121                                  * restart it.
9122                                  */
9123                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9124                                 tmr_started = 1;
9125                         }
9126                         /* Now lets send it, if there is anything to send :> */
9127                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9128                             (struct sockaddr *)&net->ro._l_addr, m,
9129                             auth_offset, auth, auth_keyid,
9130                             no_fragmentflg, 0, NULL, 0,
9131                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9132                             net->port, so_locked, NULL))) {
9133                                 /* error, we could not output */
9134                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9135                                 return (error);
9136                         }
9137                         m = endofchain = NULL;
9138                         auth = NULL;
9139                         auth_offset = 0;
9140                         /* For HB's */
9141                         /*
9142                          * We don't want to mark the net->sent time here
9143                          * since this we use this for HB and retrans cannot
9144                          * measure RTT
9145                          */
9146                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9147
9148                         /* For auto-close */
9149                         cnt_thru++;
9150                         if (*now_filled == 0) {
9151                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9152                                 *now = asoc->time_last_sent;
9153                                 *now_filled = 1;
9154                         } else {
9155                                 asoc->time_last_sent = *now;
9156                         }
9157                         *cnt_out += bundle_at;
9158 #ifdef SCTP_AUDITING_ENABLED
9159                         sctp_audit_log(0xC4, bundle_at);
9160 #endif
9161                         if (bundle_at) {
9162                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9163                         }
9164                         for (i = 0; i < bundle_at; i++) {
9165                                 SCTP_STAT_INCR(sctps_sendretransdata);
9166                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9167                                 /*
9168                                  * When we have a revoked data, and we
9169                                  * retransmit it, then we clear the revoked
9170                                  * flag since this flag dictates if we
9171                                  * subtracted from the fs
9172                                  */
9173                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9174                                         /* Deflate the cwnd */
9175                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9176                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9177                                 }
9178                                 data_list[i]->snd_count++;
9179                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9180                                 /* record the time */
9181                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9182                                 if (data_list[i]->book_size_scale) {
9183                                         /*
9184                                          * need to double the book size on
9185                                          * this one
9186                                          */
9187                                         data_list[i]->book_size_scale = 0;
9188                                         /*
9189                                          * Since we double the booksize, we
9190                                          * must also double the output queue
9191                                          * size, since this get shrunk when
9192                                          * we free by this amount.
9193                                          */
9194                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9195                                         data_list[i]->book_size *= 2;
9196
9197
9198                                 } else {
9199                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9200                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9201                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9202                                         }
9203                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9204                                             (uint32_t) (data_list[i]->send_size +
9205                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9206                                 }
9207                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9208                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9209                                             data_list[i]->whoTo->flight_size,
9210                                             data_list[i]->book_size,
9211                                             (uintptr_t) data_list[i]->whoTo,
9212                                             data_list[i]->rec.data.TSN_seq);
9213                                 }
9214                                 sctp_flight_size_increase(data_list[i]);
9215                                 sctp_total_flight_increase(stcb, data_list[i]);
9216                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9217                                         /* SWS sender side engages */
9218                                         asoc->peers_rwnd = 0;
9219                                 }
9220                                 if ((i == 0) &&
9221                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9222                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9223                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9224                                             (tmr_started == 0)) {
9225                                                 /*-
9226                                                  * ok we just fast-retrans'd
9227                                                  * the lowest TSN, i.e the
9228                                                  * first on the list. In
9229                                                  * this case we want to give
9230                                                  * some more time to get a
9231                                                  * SACK back without a
9232                                                  * t3-expiring.
9233                                                  */
9234                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9235                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9236                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9237                                         }
9238                                 }
9239                         }
9240                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9241                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9242                         }
9243 #ifdef SCTP_AUDITING_ENABLED
9244                         sctp_auditing(21, inp, stcb, NULL);
9245 #endif
9246                 } else {
9247                         /* None will fit */
9248                         return (1);
9249                 }
9250                 if (asoc->sent_queue_retran_cnt <= 0) {
9251                         /* all done we have no more to retran */
9252                         asoc->sent_queue_retran_cnt = 0;
9253                         break;
9254                 }
9255                 if (one_chunk) {
9256                         /* No more room in rwnd */
9257                         return (1);
9258                 }
9259                 /* stop the for loop here. we sent out a packet */
9260                 break;
9261         }
9262         return (0);
9263 }
9264
9265
9266 static int
9267 sctp_timer_validation(struct sctp_inpcb *inp,
9268     struct sctp_tcb *stcb,
9269     struct sctp_association *asoc,
9270     int ret)
9271 {
9272         struct sctp_nets *net;
9273
9274         /* Validate that a timer is running somewhere */
9275         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9276                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9277                         /* Here is a timer */
9278                         return (ret);
9279                 }
9280         }
9281         SCTP_TCB_LOCK_ASSERT(stcb);
9282         /* Gak, we did not have a timer somewhere */
9283         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9284         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9285         return (ret);
9286 }
9287
9288 void
9289 sctp_chunk_output(struct sctp_inpcb *inp,
9290     struct sctp_tcb *stcb,
9291     int from_where,
9292     int so_locked
9293 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9294     SCTP_UNUSED
9295 #endif
9296 )
9297 {
9298         /*-
9299          * Ok this is the generic chunk service queue. we must do the
9300          * following:
9301          * - See if there are retransmits pending, if so we must
9302          *   do these first.
9303          * - Service the stream queue that is next, moving any
9304          *   message (note I must get a complete message i.e.
9305          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9306          *   TSN's
9307          * - Check to see if the cwnd/rwnd allows any output, if so we
9308          *   go ahead and fomulate and send the low level chunks. Making sure
9309          *   to combine any control in the control chunk queue also.
9310          */
9311         struct sctp_association *asoc;
9312         struct sctp_nets *net;
9313         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9314             burst_cnt = 0;
9315         struct timeval now;
9316         int now_filled = 0;
9317         int nagle_on = 0;
9318         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9319         int un_sent = 0;
9320         int fr_done, tot_frs = 0;
9321
9322         asoc = &stcb->asoc;
9323         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9324                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9325                         nagle_on = 0;
9326                 } else {
9327                         nagle_on = 1;
9328                 }
9329         }
9330         SCTP_TCB_LOCK_ASSERT(stcb);
9331
9332         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9333
9334         if ((un_sent <= 0) &&
9335             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9336             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9337             (asoc->sent_queue_retran_cnt == 0)) {
9338                 /* Nothing to do unless there is something to be sent left */
9339                 return;
9340         }
9341         /*
9342          * Do we have something to send, data or control AND a sack timer
9343          * running, if so piggy-back the sack.
9344          */
9345         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9346                 sctp_send_sack(stcb);
9347                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9348         }
9349         while (asoc->sent_queue_retran_cnt) {
9350                 /*-
9351                  * Ok, it is retransmission time only, we send out only ONE
9352                  * packet with a single call off to the retran code.
9353                  */
9354                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9355                         /*-
9356                          * Special hook for handling cookiess discarded
9357                          * by peer that carried data. Send cookie-ack only
9358                          * and then the next call with get the retran's.
9359                          */
9360                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9361                             from_where,
9362                             &now, &now_filled, frag_point, so_locked);
9363                         return;
9364                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9365                         /* if its not from a HB then do it */
9366                         fr_done = 0;
9367                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9368                         if (fr_done) {
9369                                 tot_frs++;
9370                         }
9371                 } else {
9372                         /*
9373                          * its from any other place, we don't allow retran
9374                          * output (only control)
9375                          */
9376                         ret = 1;
9377                 }
9378                 if (ret > 0) {
9379                         /* Can't send anymore */
9380                         /*-
9381                          * now lets push out control by calling med-level
9382                          * output once. this assures that we WILL send HB's
9383                          * if queued too.
9384                          */
9385                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9386                             from_where,
9387                             &now, &now_filled, frag_point, so_locked);
9388 #ifdef SCTP_AUDITING_ENABLED
9389                         sctp_auditing(8, inp, stcb, NULL);
9390 #endif
9391                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9392                         return;
9393                 }
9394                 if (ret < 0) {
9395                         /*-
9396                          * The count was off.. retran is not happening so do
9397                          * the normal retransmission.
9398                          */
9399 #ifdef SCTP_AUDITING_ENABLED
9400                         sctp_auditing(9, inp, stcb, NULL);
9401 #endif
9402                         if (ret == SCTP_RETRAN_EXIT) {
9403                                 return;
9404                         }
9405                         break;
9406                 }
9407                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9408                         /* Only one transmission allowed out of a timeout */
9409 #ifdef SCTP_AUDITING_ENABLED
9410                         sctp_auditing(10, inp, stcb, NULL);
9411 #endif
9412                         /* Push out any control */
9413                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9414                             &now, &now_filled, frag_point, so_locked);
9415                         return;
9416                 }
9417                 if ((asoc->max_burst > 0) && (tot_frs > asoc->max_burst)) {
9418                         /* Hit FR burst limit */
9419                         return;
9420                 }
9421                 if ((num_out == 0) && (ret == 0)) {
9422                         /* No more retrans to send */
9423                         break;
9424                 }
9425         }
9426 #ifdef SCTP_AUDITING_ENABLED
9427         sctp_auditing(12, inp, stcb, NULL);
9428 #endif
9429         /* Check for bad destinations, if they exist move chunks around. */
9430         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9431                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9432                     SCTP_ADDR_NOT_REACHABLE) {
9433                         /*-
9434                          * if possible move things off of this address we
9435                          * still may send below due to the dormant state but
9436                          * we try to find an alternate address to send to
9437                          * and if we have one we move all queued data on the
9438                          * out wheel to this alternate address.
9439                          */
9440                         if (net->ref_count > 1)
9441                                 sctp_move_chunks_from_net(stcb, net);
9442                 } else if ((asoc->sctp_cmt_on_off > 0) &&
9443                             (asoc->sctp_cmt_pf > 0) &&
9444                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9445                         /*
9446                          * JRS 5/14/07 - If CMT PF is on and the current
9447                          * destination is in PF state, move all queued data
9448                          * to an alternate desination.
9449                          */
9450                         if (net->ref_count > 1)
9451                                 sctp_move_chunks_from_net(stcb, net);
9452                 } else {
9453                         /*-
9454                          * if ((asoc->sat_network) || (net->addr_is_local))
9455                          * { burst_limit = asoc->max_burst *
9456                          * SCTP_SAT_NETWORK_BURST_INCR; }
9457                          */
9458                         if (asoc->max_burst > 0) {
9459                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9460                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9461                                                 /*
9462                                                  * JRS - Use the congestion
9463                                                  * control given in the
9464                                                  * congestion control module
9465                                                  */
9466                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9467                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9468                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9469                                                 }
9470                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9471                                         }
9472                                         net->fast_retran_ip = 0;
9473                                 } else {
9474                                         if (net->flight_size == 0) {
9475                                                 /*
9476                                                  * Should be decaying the
9477                                                  * cwnd here
9478                                                  */
9479                                                 ;
9480                                         }
9481                                 }
9482                         }
9483                 }
9484
9485         }
9486         burst_cnt = 0;
9487         do {
9488                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9489                     &reason_code, 0, from_where,
9490                     &now, &now_filled, frag_point, so_locked);
9491                 if (error) {
9492                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9493                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9494                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9495                         }
9496                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9497                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9498                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9499                         }
9500                         break;
9501                 }
9502                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9503
9504                 tot_out += num_out;
9505                 burst_cnt++;
9506                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9507                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9508                         if (num_out == 0) {
9509                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9510                         }
9511                 }
9512                 if (nagle_on) {
9513                         /*-
9514                          * When nagle is on, we look at how much is un_sent, then
9515                          * if its smaller than an MTU and we have data in
9516                          * flight we stop.
9517                          */
9518                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9519                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9520                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9521                             (stcb->asoc.total_flight > 0)) {
9522                                 break;
9523                         }
9524                 }
9525                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9526                     TAILQ_EMPTY(&asoc->send_queue) &&
9527                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
9528                         /* Nothing left to send */
9529                         break;
9530                 }
9531                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9532                         /* Nothing left to send */
9533                         break;
9534                 }
9535         } while (num_out &&
9536             ((asoc->max_burst == 0) ||
9537             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9538             (burst_cnt < asoc->max_burst)));
9539
9540         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9541                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
9542                         SCTP_STAT_INCR(sctps_maxburstqueued);
9543                         asoc->burst_limit_applied = 1;
9544                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9545                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9546                         }
9547                 } else {
9548                         asoc->burst_limit_applied = 0;
9549                 }
9550         }
9551         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9552                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9553         }
9554         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9555             tot_out);
9556
9557         /*-
9558          * Now we need to clean up the control chunk chain if a ECNE is on
9559          * it. It must be marked as UNSENT again so next call will continue
9560          * to send it until such time that we get a CWR, to remove it.
9561          */
9562         if (stcb->asoc.ecn_echo_cnt_onq)
9563                 sctp_fix_ecn_echo(asoc);
9564         return;
9565 }
9566
9567
9568 int
9569 sctp_output(inp, m, addr, control, p, flags)
9570         struct sctp_inpcb *inp;
9571         struct mbuf *m;
9572         struct sockaddr *addr;
9573         struct mbuf *control;
9574         struct thread *p;
9575         int flags;
9576 {
9577         if (inp == NULL) {
9578                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9579                 return (EINVAL);
9580         }
9581         if (inp->sctp_socket == NULL) {
9582                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9583                 return (EINVAL);
9584         }
9585         return (sctp_sosend(inp->sctp_socket,
9586             addr,
9587             (struct uio *)NULL,
9588             m,
9589             control,
9590             flags, p
9591             ));
9592 }
9593
9594 void
9595 send_forward_tsn(struct sctp_tcb *stcb,
9596     struct sctp_association *asoc)
9597 {
9598         struct sctp_tmit_chunk *chk;
9599         struct sctp_forward_tsn_chunk *fwdtsn;
9600         uint32_t advance_peer_ack_point;
9601
9602         SCTP_TCB_LOCK_ASSERT(stcb);
9603         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9604                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9605                         /* mark it to unsent */
9606                         chk->sent = SCTP_DATAGRAM_UNSENT;
9607                         chk->snd_count = 0;
9608                         /* Do we correct its output location? */
9609                         if (chk->whoTo != asoc->primary_destination) {
9610                                 sctp_free_remote_addr(chk->whoTo);
9611                                 chk->whoTo = asoc->primary_destination;
9612                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9613                         }
9614                         goto sctp_fill_in_rest;
9615                 }
9616         }
9617         /* Ok if we reach here we must build one */
9618         sctp_alloc_a_chunk(stcb, chk);
9619         if (chk == NULL) {
9620                 return;
9621         }
9622         asoc->fwd_tsn_cnt++;
9623         chk->copy_by_ref = 0;
9624         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9625         chk->rec.chunk_id.can_take_data = 0;
9626         chk->asoc = asoc;
9627         chk->whoTo = NULL;
9628         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9629         if (chk->data == NULL) {
9630                 sctp_free_a_chunk(stcb, chk);
9631                 return;
9632         }
9633         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9634         chk->sent = SCTP_DATAGRAM_UNSENT;
9635         chk->snd_count = 0;
9636         chk->whoTo = asoc->primary_destination;
9637         atomic_add_int(&chk->whoTo->ref_count, 1);
9638         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9639         asoc->ctrl_queue_cnt++;
9640 sctp_fill_in_rest:
9641         /*-
9642          * Here we go through and fill out the part that deals with
9643          * stream/seq of the ones we skip.
9644          */
9645         SCTP_BUF_LEN(chk->data) = 0;
9646         {
9647                 struct sctp_tmit_chunk *at, *tp1, *last;
9648                 struct sctp_strseq *strseq;
9649                 unsigned int cnt_of_space, i, ovh;
9650                 unsigned int space_needed;
9651                 unsigned int cnt_of_skipped = 0;
9652
9653                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9654                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9655                                 /* no more to look at */
9656                                 break;
9657                         }
9658                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9659                                 /* We don't report these */
9660                                 continue;
9661                         }
9662                         cnt_of_skipped++;
9663                 }
9664                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9665                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9666
9667                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9668
9669                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9670                         ovh = SCTP_MIN_OVERHEAD;
9671                 } else {
9672                         ovh = SCTP_MIN_V4_OVERHEAD;
9673                 }
9674                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9675                         /* trim to a mtu size */
9676                         cnt_of_space = asoc->smallest_mtu - ovh;
9677                 }
9678                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9679                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9680                             0xff, 0, cnt_of_skipped,
9681                             asoc->advanced_peer_ack_point);
9682
9683                 }
9684                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9685                 if (cnt_of_space < space_needed) {
9686                         /*-
9687                          * ok we must trim down the chunk by lowering the
9688                          * advance peer ack point.
9689                          */
9690                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9691                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9692                                     0xff, 0xff, cnt_of_space,
9693                                     space_needed);
9694                         }
9695                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9696                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9697                         /*-
9698                          * Go through and find the TSN that will be the one
9699                          * we report.
9700                          */
9701                         at = TAILQ_FIRST(&asoc->sent_queue);
9702                         for (i = 0; i < cnt_of_skipped; i++) {
9703                                 tp1 = TAILQ_NEXT(at, sctp_next);
9704                                 if (tp1 == NULL) {
9705                                         break;
9706                                 }
9707                                 at = tp1;
9708                         }
9709                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9710                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9711                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9712                                     asoc->advanced_peer_ack_point);
9713                         }
9714                         last = at;
9715                         /*-
9716                          * last now points to last one I can report, update
9717                          * peer ack point
9718                          */
9719                         if (last)
9720                                 advance_peer_ack_point = last->rec.data.TSN_seq;
9721                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
9722                             cnt_of_skipped * sizeof(struct sctp_strseq);
9723                 }
9724                 chk->send_size = space_needed;
9725                 /* Setup the chunk */
9726                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9727                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9728                 fwdtsn->ch.chunk_flags = 0;
9729                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9730                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9731                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9732                 fwdtsn++;
9733                 /*-
9734                  * Move pointer to after the fwdtsn and transfer to the
9735                  * strseq pointer.
9736                  */
9737                 strseq = (struct sctp_strseq *)fwdtsn;
9738                 /*-
9739                  * Now populate the strseq list. This is done blindly
9740                  * without pulling out duplicate stream info. This is
9741                  * inefficent but won't harm the process since the peer will
9742                  * look at these in sequence and will thus release anything.
9743                  * It could mean we exceed the PMTU and chop off some that
9744                  * we could have included.. but this is unlikely (aka 1432/4
9745                  * would mean 300+ stream seq's would have to be reported in
9746                  * one FWD-TSN. With a bit of work we can later FIX this to
9747                  * optimize and pull out duplcates.. but it does add more
9748                  * overhead. So for now... not!
9749                  */
9750                 at = TAILQ_FIRST(&asoc->sent_queue);
9751                 for (i = 0; i < cnt_of_skipped; i++) {
9752                         tp1 = TAILQ_NEXT(at, sctp_next);
9753                         if (tp1 == NULL)
9754                                 break;
9755                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9756                                 /* We don't report these */
9757                                 i--;
9758                                 at = tp1;
9759                                 continue;
9760                         }
9761                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9762                                 at->rec.data.fwd_tsn_cnt = 0;
9763                         }
9764                         strseq->stream = ntohs(at->rec.data.stream_number);
9765                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9766                         strseq++;
9767                         at = tp1;
9768                 }
9769         }
9770         return;
9771
9772 }
9773
9774 void
9775 sctp_send_sack(struct sctp_tcb *stcb)
9776 {
9777         /*-
9778          * Queue up a SACK or NR-SACK in the control queue.
9779          * We must first check to see if a SACK or NR-SACK is
9780          * somehow on the control queue.
9781          * If so, we will take and and remove the old one.
9782          */
9783         struct sctp_association *asoc;
9784         struct sctp_tmit_chunk *chk, *a_chk;
9785         struct sctp_sack_chunk *sack;
9786         struct sctp_nr_sack_chunk *nr_sack;
9787         struct sctp_gap_ack_block *gap_descriptor;
9788         struct sack_track *selector;
9789         int mergeable = 0;
9790         int offset;
9791         caddr_t limit;
9792         uint32_t *dup;
9793         int limit_reached = 0;
9794         unsigned int i, siz, j;
9795         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9796         int num_dups = 0;
9797         int space_req;
9798         uint32_t highest_tsn;
9799         uint8_t flags;
9800         uint8_t type;
9801         uint8_t tsn_map;
9802
9803         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
9804             (stcb->asoc.peer_supports_nr_sack == 1)) {
9805                 type = SCTP_NR_SELECTIVE_ACK;
9806         } else {
9807                 type = SCTP_SELECTIVE_ACK;
9808         }
9809         a_chk = NULL;
9810         asoc = &stcb->asoc;
9811         SCTP_TCB_LOCK_ASSERT(stcb);
9812         if (asoc->last_data_chunk_from == NULL) {
9813                 /* Hmm we never received anything */
9814                 return;
9815         }
9816         sctp_slide_mapping_arrays(stcb);
9817         sctp_set_rwnd(stcb, asoc);
9818         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9819                 if (chk->rec.chunk_id.id == type) {
9820                         /* Hmm, found a sack already on queue, remove it */
9821                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9822                         asoc->ctrl_queue_cnt--;
9823                         a_chk = chk;
9824                         if (a_chk->data) {
9825                                 sctp_m_freem(a_chk->data);
9826                                 a_chk->data = NULL;
9827                         }
9828                         sctp_free_remote_addr(a_chk->whoTo);
9829                         a_chk->whoTo = NULL;
9830                         break;
9831                 }
9832         }
9833         if (a_chk == NULL) {
9834                 sctp_alloc_a_chunk(stcb, a_chk);
9835                 if (a_chk == NULL) {
9836                         /* No memory so we drop the idea, and set a timer */
9837                         if (stcb->asoc.delayed_ack) {
9838                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9839                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9840                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9841                                     stcb->sctp_ep, stcb, NULL);
9842                         } else {
9843                                 stcb->asoc.send_sack = 1;
9844                         }
9845                         return;
9846                 }
9847                 a_chk->copy_by_ref = 0;
9848                 a_chk->rec.chunk_id.id = type;
9849                 a_chk->rec.chunk_id.can_take_data = 1;
9850         }
9851         /* Clear our pkt counts */
9852         asoc->data_pkts_seen = 0;
9853
9854         a_chk->asoc = asoc;
9855         a_chk->snd_count = 0;
9856         a_chk->send_size = 0;   /* fill in later */
9857         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9858         a_chk->whoTo = NULL;
9859
9860         if ((asoc->numduptsns) ||
9861             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) {
9862                 /*-
9863                  * Ok, we have some duplicates or the destination for the
9864                  * sack is unreachable, lets see if we can select an
9865                  * alternate than asoc->last_data_chunk_from
9866                  */
9867                 if ((!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) &&
9868                     (asoc->used_alt_onsack > asoc->numnets)) {
9869                         /* We used an alt last time, don't this time */
9870                         a_chk->whoTo = NULL;
9871                 } else {
9872                         asoc->used_alt_onsack++;
9873                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9874                 }
9875                 if (a_chk->whoTo == NULL) {
9876                         /* Nope, no alternate */
9877                         a_chk->whoTo = asoc->last_data_chunk_from;
9878                         asoc->used_alt_onsack = 0;
9879                 }
9880         } else {
9881                 /*
9882                  * No duplicates so we use the last place we received data
9883                  * from.
9884                  */
9885                 asoc->used_alt_onsack = 0;
9886                 a_chk->whoTo = asoc->last_data_chunk_from;
9887         }
9888         if (a_chk->whoTo) {
9889                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9890         }
9891         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
9892                 highest_tsn = asoc->highest_tsn_inside_map;
9893         } else {
9894                 highest_tsn = asoc->highest_tsn_inside_nr_map;
9895         }
9896         if (highest_tsn == asoc->cumulative_tsn) {
9897                 /* no gaps */
9898                 if (type == SCTP_SELECTIVE_ACK) {
9899                         space_req = sizeof(struct sctp_sack_chunk);
9900                 } else {
9901                         space_req = sizeof(struct sctp_nr_sack_chunk);
9902                 }
9903         } else {
9904                 /* gaps get a cluster */
9905                 space_req = MCLBYTES;
9906         }
9907         /* Ok now lets formulate a MBUF with our sack */
9908         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9909         if ((a_chk->data == NULL) ||
9910             (a_chk->whoTo == NULL)) {
9911                 /* rats, no mbuf memory */
9912                 if (a_chk->data) {
9913                         /* was a problem with the destination */
9914                         sctp_m_freem(a_chk->data);
9915                         a_chk->data = NULL;
9916                 }
9917                 sctp_free_a_chunk(stcb, a_chk);
9918                 /* sa_ignore NO_NULL_CHK */
9919                 if (stcb->asoc.delayed_ack) {
9920                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9921                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9922                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9923                             stcb->sctp_ep, stcb, NULL);
9924                 } else {
9925                         stcb->asoc.send_sack = 1;
9926                 }
9927                 return;
9928         }
9929         /* ok, lets go through and fill it in */
9930         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9931         space = M_TRAILINGSPACE(a_chk->data);
9932         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9933                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9934         }
9935         limit = mtod(a_chk->data, caddr_t);
9936         limit += space;
9937
9938         flags = 0;
9939
9940         if ((asoc->sctp_cmt_on_off > 0) &&
9941             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
9942                 /*-
9943                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9944                  * received, then set high bit to 1, else 0. Reset
9945                  * pkts_rcvd.
9946                  */
9947                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9948                 asoc->cmt_dac_pkts_rcvd = 0;
9949         }
9950 #ifdef SCTP_ASOCLOG_OF_TSNS
9951         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9952         stcb->asoc.cumack_log_atsnt++;
9953         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9954                 stcb->asoc.cumack_log_atsnt = 0;
9955         }
9956 #endif
9957         /* reset the readers interpretation */
9958         stcb->freed_by_sorcv_sincelast = 0;
9959
9960         if (type == SCTP_SELECTIVE_ACK) {
9961                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9962                 nr_sack = NULL;
9963                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9964                 if (highest_tsn > asoc->mapping_array_base_tsn) {
9965                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9966                 } else {
9967                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
9968                 }
9969         } else {
9970                 sack = NULL;
9971                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
9972                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
9973                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
9974                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9975                 } else {
9976                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
9977                 }
9978         }
9979
9980         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
9981                 offset = 1;
9982         } else {
9983                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9984         }
9985         if (((type == SCTP_SELECTIVE_ACK) &&
9986             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
9987             ((type == SCTP_NR_SELECTIVE_ACK) &&
9988             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
9989                 /* we have a gap .. maybe */
9990                 for (i = 0; i < siz; i++) {
9991                         tsn_map = asoc->mapping_array[i];
9992                         if (type == SCTP_SELECTIVE_ACK) {
9993                                 tsn_map |= asoc->nr_mapping_array[i];
9994                         }
9995                         if (i == 0) {
9996                                 /*
9997                                  * Clear all bits corresponding to TSNs
9998                                  * smaller or equal to the cumulative TSN.
9999                                  */
10000                                 tsn_map &= (~0 << (1 - offset));
10001                         }
10002                         selector = &sack_array[tsn_map];
10003                         if (mergeable && selector->right_edge) {
10004                                 /*
10005                                  * Backup, left and right edges were ok to
10006                                  * merge.
10007                                  */
10008                                 num_gap_blocks--;
10009                                 gap_descriptor--;
10010                         }
10011                         if (selector->num_entries == 0)
10012                                 mergeable = 0;
10013                         else {
10014                                 for (j = 0; j < selector->num_entries; j++) {
10015                                         if (mergeable && selector->right_edge) {
10016                                                 /*
10017                                                  * do a merge by NOT setting
10018                                                  * the left side
10019                                                  */
10020                                                 mergeable = 0;
10021                                         } else {
10022                                                 /*
10023                                                  * no merge, set the left
10024                                                  * side
10025                                                  */
10026                                                 mergeable = 0;
10027                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10028                                         }
10029                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10030                                         num_gap_blocks++;
10031                                         gap_descriptor++;
10032                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10033                                                 /* no more room */
10034                                                 limit_reached = 1;
10035                                                 break;
10036                                         }
10037                                 }
10038                                 if (selector->left_edge) {
10039                                         mergeable = 1;
10040                                 }
10041                         }
10042                         if (limit_reached) {
10043                                 /* Reached the limit stop */
10044                                 break;
10045                         }
10046                         offset += 8;
10047                 }
10048         }
10049         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10050             (limit_reached == 0)) {
10051
10052                 mergeable = 0;
10053
10054                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10055                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10056                 } else {
10057                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10058                 }
10059
10060                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10061                         offset = 1;
10062                 } else {
10063                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10064                 }
10065                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10066                         /* we have a gap .. maybe */
10067                         for (i = 0; i < siz; i++) {
10068                                 tsn_map = asoc->nr_mapping_array[i];
10069                                 if (i == 0) {
10070                                         /*
10071                                          * Clear all bits corresponding to
10072                                          * TSNs smaller or equal to the
10073                                          * cumulative TSN.
10074                                          */
10075                                         tsn_map &= (~0 << (1 - offset));
10076                                 }
10077                                 selector = &sack_array[tsn_map];
10078                                 if (mergeable && selector->right_edge) {
10079                                         /*
10080                                          * Backup, left and right edges were
10081                                          * ok to merge.
10082                                          */
10083                                         num_nr_gap_blocks--;
10084                                         gap_descriptor--;
10085                                 }
10086                                 if (selector->num_entries == 0)
10087                                         mergeable = 0;
10088                                 else {
10089                                         for (j = 0; j < selector->num_entries; j++) {
10090                                                 if (mergeable && selector->right_edge) {
10091                                                         /*
10092                                                          * do a merge by NOT
10093                                                          * setting the left
10094                                                          * side
10095                                                          */
10096                                                         mergeable = 0;
10097                                                 } else {
10098                                                         /*
10099                                                          * no merge, set the
10100                                                          * left side
10101                                                          */
10102                                                         mergeable = 0;
10103                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10104                                                 }
10105                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10106                                                 num_nr_gap_blocks++;
10107                                                 gap_descriptor++;
10108                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10109                                                         /* no more room */
10110                                                         limit_reached = 1;
10111                                                         break;
10112                                                 }
10113                                         }
10114                                         if (selector->left_edge) {
10115                                                 mergeable = 1;
10116                                         }
10117                                 }
10118                                 if (limit_reached) {
10119                                         /* Reached the limit stop */
10120                                         break;
10121                                 }
10122                                 offset += 8;
10123                         }
10124                 }
10125         }
10126         /* now we must add any dups we are going to report. */
10127         if ((limit_reached == 0) && (asoc->numduptsns)) {
10128                 dup = (uint32_t *) gap_descriptor;
10129                 for (i = 0; i < asoc->numduptsns; i++) {
10130                         *dup = htonl(asoc->dup_tsns[i]);
10131                         dup++;
10132                         num_dups++;
10133                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10134                                 /* no more room */
10135                                 break;
10136                         }
10137                 }
10138                 asoc->numduptsns = 0;
10139         }
10140         /*
10141          * now that the chunk is prepared queue it to the control chunk
10142          * queue.
10143          */
10144         if (type == SCTP_SELECTIVE_ACK) {
10145                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10146                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10147                     num_dups * sizeof(int32_t);
10148                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10149                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10150                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10151                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10152                 sack->sack.num_dup_tsns = htons(num_dups);
10153                 sack->ch.chunk_type = type;
10154                 sack->ch.chunk_flags = flags;
10155                 sack->ch.chunk_length = htons(a_chk->send_size);
10156         } else {
10157                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10158                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10159                     num_dups * sizeof(int32_t);
10160                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10161                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10162                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10163                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10164                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10165                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10166                 nr_sack->nr_sack.reserved = 0;
10167                 nr_sack->ch.chunk_type = type;
10168                 nr_sack->ch.chunk_flags = flags;
10169                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10170         }
10171         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10172         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10173         asoc->ctrl_queue_cnt++;
10174         asoc->send_sack = 0;
10175         SCTP_STAT_INCR(sctps_sendsacks);
10176         return;
10177 }
10178
10179 void
10180 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10181 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10182     SCTP_UNUSED
10183 #endif
10184 )
10185 {
10186         struct mbuf *m_abort;
10187         struct mbuf *m_out = NULL, *m_end = NULL;
10188         struct sctp_abort_chunk *abort = NULL;
10189         int sz;
10190         uint32_t auth_offset = 0;
10191         struct sctp_auth_chunk *auth = NULL;
10192
10193         /*-
10194          * Add an AUTH chunk, if chunk requires it and save the offset into
10195          * the chain for AUTH
10196          */
10197         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10198             stcb->asoc.peer_auth_chunks)) {
10199                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10200                     stcb, SCTP_ABORT_ASSOCIATION);
10201                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10202         }
10203         SCTP_TCB_LOCK_ASSERT(stcb);
10204         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10205         if (m_abort == NULL) {
10206                 /* no mbuf's */
10207                 if (m_out)
10208                         sctp_m_freem(m_out);
10209                 return;
10210         }
10211         /* link in any error */
10212         SCTP_BUF_NEXT(m_abort) = operr;
10213         sz = 0;
10214         if (operr) {
10215                 struct mbuf *n;
10216
10217                 n = operr;
10218                 while (n) {
10219                         sz += SCTP_BUF_LEN(n);
10220                         n = SCTP_BUF_NEXT(n);
10221                 }
10222         }
10223         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10224         if (m_out == NULL) {
10225                 /* NO Auth chunk prepended, so reserve space in front */
10226                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10227                 m_out = m_abort;
10228         } else {
10229                 /* Put AUTH chunk at the front of the chain */
10230                 SCTP_BUF_NEXT(m_end) = m_abort;
10231         }
10232
10233         /* fill in the ABORT chunk */
10234         abort = mtod(m_abort, struct sctp_abort_chunk *);
10235         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10236         abort->ch.chunk_flags = 0;
10237         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10238
10239         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10240             stcb->asoc.primary_destination,
10241             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10242             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10243             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10244             stcb->asoc.primary_destination->port, so_locked, NULL);
10245         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10246 }
10247
10248 void
10249 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10250     struct sctp_nets *net,
10251     int reflect_vtag)
10252 {
10253         /* formulate and SEND a SHUTDOWN-COMPLETE */
10254         struct mbuf *m_shutdown_comp;
10255         struct sctp_shutdown_complete_chunk *shutdown_complete;
10256         uint32_t vtag;
10257         uint8_t flags;
10258
10259         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10260         if (m_shutdown_comp == NULL) {
10261                 /* no mbuf's */
10262                 return;
10263         }
10264         if (reflect_vtag) {
10265                 flags = SCTP_HAD_NO_TCB;
10266                 vtag = stcb->asoc.my_vtag;
10267         } else {
10268                 flags = 0;
10269                 vtag = stcb->asoc.peer_vtag;
10270         }
10271         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10272         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10273         shutdown_complete->ch.chunk_flags = flags;
10274         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10275         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10276         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10277             (struct sockaddr *)&net->ro._l_addr,
10278             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10279             stcb->sctp_ep->sctp_lport, stcb->rport,
10280             htonl(vtag),
10281             net->port, SCTP_SO_NOT_LOCKED, NULL);
10282         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10283         return;
10284 }
10285
10286 void
10287 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10288     uint32_t vrf_id, uint16_t port)
10289 {
10290         /* formulate and SEND a SHUTDOWN-COMPLETE */
10291         struct mbuf *o_pak;
10292         struct mbuf *mout;
10293         struct ip *iph, *iph_out;
10294         struct udphdr *udp = NULL;
10295
10296 #ifdef INET6
10297         struct ip6_hdr *ip6, *ip6_out;
10298
10299 #endif
10300         int offset_out, len, mlen;
10301         struct sctp_shutdown_complete_msg *comp_cp;
10302
10303         iph = mtod(m, struct ip *);
10304         switch (iph->ip_v) {
10305         case IPVERSION:
10306                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10307                 break;
10308 #ifdef INET6
10309         case IPV6_VERSION >> 4:
10310                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10311                 break;
10312 #endif
10313         default:
10314                 return;
10315         }
10316         if (port) {
10317                 len += sizeof(struct udphdr);
10318         }
10319         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10320         if (mout == NULL) {
10321                 return;
10322         }
10323         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10324         SCTP_BUF_LEN(mout) = len;
10325         SCTP_BUF_NEXT(mout) = NULL;
10326         iph_out = NULL;
10327 #ifdef INET6
10328         ip6_out = NULL;
10329 #endif
10330         offset_out = 0;
10331
10332         switch (iph->ip_v) {
10333         case IPVERSION:
10334                 iph_out = mtod(mout, struct ip *);
10335
10336                 /* Fill in the IP header for the ABORT */
10337                 iph_out->ip_v = IPVERSION;
10338                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10339                 iph_out->ip_tos = (u_char)0;
10340                 iph_out->ip_id = 0;
10341                 iph_out->ip_off = 0;
10342                 iph_out->ip_ttl = MAXTTL;
10343                 if (port) {
10344                         iph_out->ip_p = IPPROTO_UDP;
10345                 } else {
10346                         iph_out->ip_p = IPPROTO_SCTP;
10347                 }
10348                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10349                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10350
10351                 /* let IP layer calculate this */
10352                 iph_out->ip_sum = 0;
10353                 offset_out += sizeof(*iph_out);
10354                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10355                     (caddr_t)iph_out + offset_out);
10356                 break;
10357 #ifdef INET6
10358         case IPV6_VERSION >> 4:
10359                 ip6 = (struct ip6_hdr *)iph;
10360                 ip6_out = mtod(mout, struct ip6_hdr *);
10361
10362                 /* Fill in the IPv6 header for the ABORT */
10363                 ip6_out->ip6_flow = ip6->ip6_flow;
10364                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10365                 if (port) {
10366                         ip6_out->ip6_nxt = IPPROTO_UDP;
10367                 } else {
10368                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10369                 }
10370                 ip6_out->ip6_src = ip6->ip6_dst;
10371                 ip6_out->ip6_dst = ip6->ip6_src;
10372                 /*
10373                  * ?? The old code had both the iph len + payload, I think
10374                  * this is wrong and would never have worked
10375                  */
10376                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10377                 offset_out += sizeof(*ip6_out);
10378                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10379                     (caddr_t)ip6_out + offset_out);
10380                 break;
10381 #endif                          /* INET6 */
10382         default:
10383                 /* Currently not supported. */
10384                 sctp_m_freem(mout);
10385                 return;
10386         }
10387         if (port) {
10388                 udp = (struct udphdr *)comp_cp;
10389                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10390                 udp->uh_dport = port;
10391                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10392                 if (iph_out)
10393                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10394                 offset_out += sizeof(struct udphdr);
10395                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10396         }
10397         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10398                 /* no mbuf's */
10399                 sctp_m_freem(mout);
10400                 return;
10401         }
10402         /* Now copy in and fill in the ABORT tags etc. */
10403         comp_cp->sh.src_port = sh->dest_port;
10404         comp_cp->sh.dest_port = sh->src_port;
10405         comp_cp->sh.checksum = 0;
10406         comp_cp->sh.v_tag = sh->v_tag;
10407         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10408         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10409         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10410
10411         if (iph_out != NULL) {
10412                 sctp_route_t ro;
10413                 int ret;
10414
10415                 mlen = SCTP_BUF_LEN(mout);
10416                 bzero(&ro, sizeof ro);
10417                 /* set IPv4 length */
10418                 iph_out->ip_len = mlen;
10419 #ifdef  SCTP_PACKET_LOGGING
10420                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10421                         sctp_packet_log(mout, mlen);
10422 #endif
10423                 if (port) {
10424 #if defined(SCTP_WITH_NO_CSUM)
10425                         SCTP_STAT_INCR(sctps_sendnocrc);
10426 #else
10427                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10428                         SCTP_STAT_INCR(sctps_sendswcrc);
10429 #endif
10430                         SCTP_ENABLE_UDP_CSUM(mout);
10431                 } else {
10432 #if defined(SCTP_WITH_NO_CSUM)
10433                         SCTP_STAT_INCR(sctps_sendnocrc);
10434 #else
10435                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10436                         mout->m_pkthdr.csum_data = 0;
10437                         SCTP_STAT_INCR(sctps_sendhwcrc);
10438 #endif
10439                 }
10440                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10441                 /* out it goes */
10442                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10443
10444                 /* Free the route if we got one back */
10445                 if (ro.ro_rt)
10446                         RTFREE(ro.ro_rt);
10447         }
10448 #ifdef INET6
10449         if (ip6_out != NULL) {
10450                 struct route_in6 ro;
10451                 int ret;
10452                 struct ifnet *ifp = NULL;
10453
10454                 bzero(&ro, sizeof(ro));
10455                 mlen = SCTP_BUF_LEN(mout);
10456 #ifdef  SCTP_PACKET_LOGGING
10457                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10458                         sctp_packet_log(mout, mlen);
10459 #endif
10460                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10461                 if (port) {
10462 #if defined(SCTP_WITH_NO_CSUM)
10463                         SCTP_STAT_INCR(sctps_sendnocrc);
10464 #else
10465                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10466                         SCTP_STAT_INCR(sctps_sendswcrc);
10467 #endif
10468                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10469                                 udp->uh_sum = 0xffff;
10470                         }
10471                 } else {
10472 #if defined(SCTP_WITH_NO_CSUM)
10473                         SCTP_STAT_INCR(sctps_sendnocrc);
10474 #else
10475                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10476                         mout->m_pkthdr.csum_data = 0;
10477                         SCTP_STAT_INCR(sctps_sendhwcrc);
10478 #endif
10479                 }
10480                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
10481
10482                 /* Free the route if we got one back */
10483                 if (ro.ro_rt)
10484                         RTFREE(ro.ro_rt);
10485         }
10486 #endif
10487         SCTP_STAT_INCR(sctps_sendpackets);
10488         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10489         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10490         return;
10491
10492 }
10493
10494 static struct sctp_nets *
10495 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10496 {
10497         struct sctp_nets *net, *hnet;
10498         int ms_goneby, highest_ms, state_overide = 0;
10499
10500         (void)SCTP_GETTIME_TIMEVAL(now);
10501         highest_ms = 0;
10502         hnet = NULL;
10503         SCTP_TCB_LOCK_ASSERT(stcb);
10504         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10505                 if (
10506                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10507                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10508                     ) {
10509                         /*
10510                          * Skip this guy from consideration if HB is off AND
10511                          * its confirmed
10512                          */
10513                         continue;
10514                 }
10515                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10516                         /* skip this dest net from consideration */
10517                         continue;
10518                 }
10519                 if (net->last_sent_time.tv_sec) {
10520                         /* Sent to so we subtract */
10521                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10522                 } else
10523                         /* Never been sent to */
10524                         ms_goneby = 0x7fffffff;
10525                 /*-
10526                  * When the address state is unconfirmed but still
10527                  * considered reachable, we HB at a higher rate. Once it
10528                  * goes confirmed OR reaches the "unreachable" state, thenw
10529                  * we cut it back to HB at a more normal pace.
10530                  */
10531                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10532                         state_overide = 1;
10533                 } else {
10534                         state_overide = 0;
10535                 }
10536
10537                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10538                     (ms_goneby > highest_ms)) {
10539                         highest_ms = ms_goneby;
10540                         hnet = net;
10541                 }
10542         }
10543         if (hnet &&
10544             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10545                 state_overide = 1;
10546         } else {
10547                 state_overide = 0;
10548         }
10549
10550         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10551                 /*-
10552                  * Found the one with longest delay bounds OR it is
10553                  * unconfirmed and still not marked unreachable.
10554                  */
10555                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10556 #ifdef SCTP_DEBUG
10557                 if (hnet) {
10558                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10559                             (struct sockaddr *)&hnet->ro._l_addr);
10560                 } else {
10561                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10562                 }
10563 #endif
10564                 /* update the timer now */
10565                 hnet->last_sent_time = *now;
10566                 return (hnet);
10567         }
10568         /* Nothing to HB */
10569         return (NULL);
10570 }
10571
10572 int
10573 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10574 {
10575         struct sctp_tmit_chunk *chk;
10576         struct sctp_nets *net;
10577         struct sctp_heartbeat_chunk *hb;
10578         struct timeval now;
10579         struct sockaddr_in *sin;
10580         struct sockaddr_in6 *sin6;
10581
10582         SCTP_TCB_LOCK_ASSERT(stcb);
10583         if (user_req == 0) {
10584                 net = sctp_select_hb_destination(stcb, &now);
10585                 if (net == NULL) {
10586                         /*-
10587                          * All our busy none to send to, just start the
10588                          * timer again.
10589                          */
10590                         if (stcb->asoc.state == 0) {
10591                                 return (0);
10592                         }
10593                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10594                             stcb->sctp_ep,
10595                             stcb,
10596                             net);
10597                         return (0);
10598                 }
10599         } else {
10600                 net = u_net;
10601                 if (net == NULL) {
10602                         return (0);
10603                 }
10604                 (void)SCTP_GETTIME_TIMEVAL(&now);
10605         }
10606         sin = (struct sockaddr_in *)&net->ro._l_addr;
10607         if (sin->sin_family != AF_INET) {
10608                 if (sin->sin_family != AF_INET6) {
10609                         /* huh */
10610                         return (0);
10611                 }
10612         }
10613         sctp_alloc_a_chunk(stcb, chk);
10614         if (chk == NULL) {
10615                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10616                 return (0);
10617         }
10618         chk->copy_by_ref = 0;
10619         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10620         chk->rec.chunk_id.can_take_data = 1;
10621         chk->asoc = &stcb->asoc;
10622         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10623
10624         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10625         if (chk->data == NULL) {
10626                 sctp_free_a_chunk(stcb, chk);
10627                 return (0);
10628         }
10629         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10630         SCTP_BUF_LEN(chk->data) = chk->send_size;
10631         chk->sent = SCTP_DATAGRAM_UNSENT;
10632         chk->snd_count = 0;
10633         chk->whoTo = net;
10634         atomic_add_int(&chk->whoTo->ref_count, 1);
10635         /* Now we have a mbuf that we can fill in with the details */
10636         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10637         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10638         /* fill out chunk header */
10639         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10640         hb->ch.chunk_flags = 0;
10641         hb->ch.chunk_length = htons(chk->send_size);
10642         /* Fill out hb parameter */
10643         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10644         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10645         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10646         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10647         /* Did our user request this one, put it in */
10648         hb->heartbeat.hb_info.user_req = user_req;
10649         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10650         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10651         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10652                 /*
10653                  * we only take from the entropy pool if the address is not
10654                  * confirmed.
10655                  */
10656                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10657                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10658         } else {
10659                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10660                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10661         }
10662         if (sin->sin_family == AF_INET) {
10663                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10664         } else if (sin->sin_family == AF_INET6) {
10665                 /* We leave the scope the way it is in our lookup table. */
10666                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10667                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10668         } else {
10669                 /* huh compiler bug */
10670                 return (0);
10671         }
10672
10673         /*
10674          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10675          * PF-heartbeats.  Because of this, threshold management is done by
10676          * the t3 timer handler, and does not need to be done upon the send
10677          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10678          * heartbeat is being sent is in PF state, do NOT do threshold
10679          * management.
10680          */
10681         if ((stcb->asoc.sctp_cmt_pf == 0) ||
10682             ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10683                 /* ok we have a destination that needs a beat */
10684                 /* lets do the theshold management Qiaobing style */
10685                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10686                     stcb->asoc.max_send_times)) {
10687                         /*-
10688                          * we have lost the association, in a way this is
10689                          * quite bad since we really are one less time since
10690                          * we really did not send yet. This is the down side
10691                          * to the Q's style as defined in the RFC and not my
10692                          * alternate style defined in the RFC.
10693                          */
10694                         if (chk->data != NULL) {
10695                                 sctp_m_freem(chk->data);
10696                                 chk->data = NULL;
10697                         }
10698                         /*
10699                          * Here we do NOT use the macro since the
10700                          * association is now gone.
10701                          */
10702                         if (chk->whoTo) {
10703                                 sctp_free_remote_addr(chk->whoTo);
10704                                 chk->whoTo = NULL;
10705                         }
10706                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10707                         return (-1);
10708                 }
10709         }
10710         net->hb_responded = 0;
10711         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10712         stcb->asoc.ctrl_queue_cnt++;
10713         SCTP_STAT_INCR(sctps_sendheartbeat);
10714         /*-
10715          * Call directly med level routine to put out the chunk. It will
10716          * always tumble out control chunks aka HB but it may even tumble
10717          * out data too.
10718          */
10719         return (1);
10720 }
10721
10722 void
10723 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10724     uint32_t high_tsn)
10725 {
10726         struct sctp_association *asoc;
10727         struct sctp_ecne_chunk *ecne;
10728         struct sctp_tmit_chunk *chk;
10729
10730         asoc = &stcb->asoc;
10731         SCTP_TCB_LOCK_ASSERT(stcb);
10732         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10733                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
10734                         /* found a previous ECN_ECHO update it if needed */
10735                         uint32_t cnt, ctsn;
10736
10737                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10738                         ctsn = ntohl(ecne->tsn);
10739                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
10740                                 ecne->tsn = htonl(high_tsn);
10741                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
10742                         }
10743                         cnt = ntohl(ecne->num_pkts_since_cwr);
10744                         cnt++;
10745                         ecne->num_pkts_since_cwr = htonl(cnt);
10746                         return;
10747                 }
10748         }
10749         /* nope could not find one to update so we must build one */
10750         sctp_alloc_a_chunk(stcb, chk);
10751         if (chk == NULL) {
10752                 return;
10753         }
10754         chk->copy_by_ref = 0;
10755         SCTP_STAT_INCR(sctps_queue_upd_ecne);
10756         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10757         chk->rec.chunk_id.can_take_data = 0;
10758         chk->asoc = &stcb->asoc;
10759         chk->send_size = sizeof(struct sctp_ecne_chunk);
10760         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10761         if (chk->data == NULL) {
10762                 sctp_free_a_chunk(stcb, chk);
10763                 return;
10764         }
10765         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10766         SCTP_BUF_LEN(chk->data) = chk->send_size;
10767         chk->sent = SCTP_DATAGRAM_UNSENT;
10768         chk->snd_count = 0;
10769         chk->whoTo = net;
10770         atomic_add_int(&chk->whoTo->ref_count, 1);
10771         stcb->asoc.ecn_echo_cnt_onq++;
10772         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10773         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10774         ecne->ch.chunk_flags = 0;
10775         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10776         ecne->tsn = htonl(high_tsn);
10777         ecne->num_pkts_since_cwr = htonl(1);
10778         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
10779         asoc->ctrl_queue_cnt++;
10780 }
10781
10782 void
10783 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10784     struct mbuf *m, int iphlen, int bad_crc)
10785 {
10786         struct sctp_association *asoc;
10787         struct sctp_pktdrop_chunk *drp;
10788         struct sctp_tmit_chunk *chk;
10789         uint8_t *datap;
10790         int len;
10791         int was_trunc = 0;
10792         struct ip *iph;
10793
10794 #ifdef INET6
10795         struct ip6_hdr *ip6h;
10796
10797 #endif
10798         int fullsz = 0, extra = 0;
10799         long spc;
10800         int offset;
10801         struct sctp_chunkhdr *ch, chunk_buf;
10802         unsigned int chk_length;
10803
10804         if (!stcb) {
10805                 return;
10806         }
10807         asoc = &stcb->asoc;
10808         SCTP_TCB_LOCK_ASSERT(stcb);
10809         if (asoc->peer_supports_pktdrop == 0) {
10810                 /*-
10811                  * peer must declare support before I send one.
10812                  */
10813                 return;
10814         }
10815         if (stcb->sctp_socket == NULL) {
10816                 return;
10817         }
10818         sctp_alloc_a_chunk(stcb, chk);
10819         if (chk == NULL) {
10820                 return;
10821         }
10822         chk->copy_by_ref = 0;
10823         iph = mtod(m, struct ip *);
10824         if (iph == NULL) {
10825                 sctp_free_a_chunk(stcb, chk);
10826                 return;
10827         }
10828         switch (iph->ip_v) {
10829         case IPVERSION:
10830                 /* IPv4 */
10831                 len = chk->send_size = iph->ip_len;
10832                 break;
10833 #ifdef INET6
10834         case IPV6_VERSION >> 4:
10835                 /* IPv6 */
10836                 ip6h = mtod(m, struct ip6_hdr *);
10837                 len = chk->send_size = htons(ip6h->ip6_plen);
10838                 break;
10839 #endif
10840         default:
10841                 return;
10842         }
10843         /* Validate that we do not have an ABORT in here. */
10844         offset = iphlen + sizeof(struct sctphdr);
10845         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10846             sizeof(*ch), (uint8_t *) & chunk_buf);
10847         while (ch != NULL) {
10848                 chk_length = ntohs(ch->chunk_length);
10849                 if (chk_length < sizeof(*ch)) {
10850                         /* break to abort land */
10851                         break;
10852                 }
10853                 switch (ch->chunk_type) {
10854                 case SCTP_PACKET_DROPPED:
10855                 case SCTP_ABORT_ASSOCIATION:
10856                 case SCTP_INITIATION_ACK:
10857                         /**
10858                          * We don't respond with an PKT-DROP to an ABORT
10859                          * or PKT-DROP. We also do not respond to an
10860                          * INIT-ACK, because we can't know if the initiation
10861                          * tag is correct or not.
10862                          */
10863                         sctp_free_a_chunk(stcb, chk);
10864                         return;
10865                 default:
10866                         break;
10867                 }
10868                 offset += SCTP_SIZE32(chk_length);
10869                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10870                     sizeof(*ch), (uint8_t *) & chunk_buf);
10871         }
10872
10873         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10874             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10875                 /*
10876                  * only send 1 mtu worth, trim off the excess on the end.
10877                  */
10878                 fullsz = len - extra;
10879                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10880                 was_trunc = 1;
10881         }
10882         chk->asoc = &stcb->asoc;
10883         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10884         if (chk->data == NULL) {
10885 jump_out:
10886                 sctp_free_a_chunk(stcb, chk);
10887                 return;
10888         }
10889         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10890         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10891         if (drp == NULL) {
10892                 sctp_m_freem(chk->data);
10893                 chk->data = NULL;
10894                 goto jump_out;
10895         }
10896         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10897             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10898         chk->book_size_scale = 0;
10899         if (was_trunc) {
10900                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10901                 drp->trunc_len = htons(fullsz);
10902                 /*
10903                  * Len is already adjusted to size minus overhead above take
10904                  * out the pkt_drop chunk itself from it.
10905                  */
10906                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10907                 len = chk->send_size;
10908         } else {
10909                 /* no truncation needed */
10910                 drp->ch.chunk_flags = 0;
10911                 drp->trunc_len = htons(0);
10912         }
10913         if (bad_crc) {
10914                 drp->ch.chunk_flags |= SCTP_BADCRC;
10915         }
10916         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10917         SCTP_BUF_LEN(chk->data) = chk->send_size;
10918         chk->sent = SCTP_DATAGRAM_UNSENT;
10919         chk->snd_count = 0;
10920         if (net) {
10921                 /* we should hit here */
10922                 chk->whoTo = net;
10923         } else {
10924                 chk->whoTo = asoc->primary_destination;
10925         }
10926         atomic_add_int(&chk->whoTo->ref_count, 1);
10927         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10928         chk->rec.chunk_id.can_take_data = 1;
10929         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10930         drp->ch.chunk_length = htons(chk->send_size);
10931         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10932         if (spc < 0) {
10933                 spc = 0;
10934         }
10935         drp->bottle_bw = htonl(spc);
10936         if (asoc->my_rwnd) {
10937                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10938                     asoc->size_on_all_streams +
10939                     asoc->my_rwnd_control_len +
10940                     stcb->sctp_socket->so_rcv.sb_cc);
10941         } else {
10942                 /*-
10943                  * If my rwnd is 0, possibly from mbuf depletion as well as
10944                  * space used, tell the peer there is NO space aka onq == bw
10945                  */
10946                 drp->current_onq = htonl(spc);
10947         }
10948         drp->reserved = 0;
10949         datap = drp->data;
10950         m_copydata(m, iphlen, len, (caddr_t)datap);
10951         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10952         asoc->ctrl_queue_cnt++;
10953 }
10954
10955 void
10956 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
10957 {
10958         struct sctp_association *asoc;
10959         struct sctp_cwr_chunk *cwr;
10960         struct sctp_tmit_chunk *chk;
10961
10962         asoc = &stcb->asoc;
10963         SCTP_TCB_LOCK_ASSERT(stcb);
10964
10965         sctp_alloc_a_chunk(stcb, chk);
10966         if (chk == NULL) {
10967                 return;
10968         }
10969         chk->copy_by_ref = 0;
10970         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10971         chk->rec.chunk_id.can_take_data = 1;
10972         chk->asoc = &stcb->asoc;
10973         chk->send_size = sizeof(struct sctp_cwr_chunk);
10974         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10975         if (chk->data == NULL) {
10976                 sctp_free_a_chunk(stcb, chk);
10977                 return;
10978         }
10979         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10980         SCTP_BUF_LEN(chk->data) = chk->send_size;
10981         chk->sent = SCTP_DATAGRAM_UNSENT;
10982         chk->snd_count = 0;
10983         chk->whoTo = net;
10984         atomic_add_int(&chk->whoTo->ref_count, 1);
10985         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10986         cwr->ch.chunk_type = SCTP_ECN_CWR;
10987         cwr->ch.chunk_flags = override;
10988         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10989         cwr->tsn = htonl(high_tsn);
10990         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10991         asoc->ctrl_queue_cnt++;
10992 }
10993
10994 void
10995 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10996     int number_entries, uint16_t * list,
10997     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10998 {
10999         int len, old_len, i;
11000         struct sctp_stream_reset_out_request *req_out;
11001         struct sctp_chunkhdr *ch;
11002
11003         ch = mtod(chk->data, struct sctp_chunkhdr *);
11004
11005
11006         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11007
11008         /* get to new offset for the param. */
11009         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11010         /* now how long will this param be? */
11011         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11012         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11013         req_out->ph.param_length = htons(len);
11014         req_out->request_seq = htonl(seq);
11015         req_out->response_seq = htonl(resp_seq);
11016         req_out->send_reset_at_tsn = htonl(last_sent);
11017         if (number_entries) {
11018                 for (i = 0; i < number_entries; i++) {
11019                         req_out->list_of_streams[i] = htons(list[i]);
11020                 }
11021         }
11022         if (SCTP_SIZE32(len) > len) {
11023                 /*-
11024                  * Need to worry about the pad we may end up adding to the
11025                  * end. This is easy since the struct is either aligned to 4
11026                  * bytes or 2 bytes off.
11027                  */
11028                 req_out->list_of_streams[number_entries] = 0;
11029         }
11030         /* now fix the chunk length */
11031         ch->chunk_length = htons(len + old_len);
11032         chk->book_size = len + old_len;
11033         chk->book_size_scale = 0;
11034         chk->send_size = SCTP_SIZE32(chk->book_size);
11035         SCTP_BUF_LEN(chk->data) = chk->send_size;
11036         return;
11037 }
11038
11039
11040 void
11041 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11042     int number_entries, uint16_t * list,
11043     uint32_t seq)
11044 {
11045         int len, old_len, i;
11046         struct sctp_stream_reset_in_request *req_in;
11047         struct sctp_chunkhdr *ch;
11048
11049         ch = mtod(chk->data, struct sctp_chunkhdr *);
11050
11051
11052         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11053
11054         /* get to new offset for the param. */
11055         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11056         /* now how long will this param be? */
11057         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11058         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11059         req_in->ph.param_length = htons(len);
11060         req_in->request_seq = htonl(seq);
11061         if (number_entries) {
11062                 for (i = 0; i < number_entries; i++) {
11063                         req_in->list_of_streams[i] = htons(list[i]);
11064                 }
11065         }
11066         if (SCTP_SIZE32(len) > len) {
11067                 /*-
11068                  * Need to worry about the pad we may end up adding to the
11069                  * end. This is easy since the struct is either aligned to 4
11070                  * bytes or 2 bytes off.
11071                  */
11072                 req_in->list_of_streams[number_entries] = 0;
11073         }
11074         /* now fix the chunk length */
11075         ch->chunk_length = htons(len + old_len);
11076         chk->book_size = len + old_len;
11077         chk->book_size_scale = 0;
11078         chk->send_size = SCTP_SIZE32(chk->book_size);
11079         SCTP_BUF_LEN(chk->data) = chk->send_size;
11080         return;
11081 }
11082
11083
11084 void
11085 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11086     uint32_t seq)
11087 {
11088         int len, old_len;
11089         struct sctp_stream_reset_tsn_request *req_tsn;
11090         struct sctp_chunkhdr *ch;
11091
11092         ch = mtod(chk->data, struct sctp_chunkhdr *);
11093
11094
11095         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11096
11097         /* get to new offset for the param. */
11098         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11099         /* now how long will this param be? */
11100         len = sizeof(struct sctp_stream_reset_tsn_request);
11101         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11102         req_tsn->ph.param_length = htons(len);
11103         req_tsn->request_seq = htonl(seq);
11104
11105         /* now fix the chunk length */
11106         ch->chunk_length = htons(len + old_len);
11107         chk->send_size = len + old_len;
11108         chk->book_size = SCTP_SIZE32(chk->send_size);
11109         chk->book_size_scale = 0;
11110         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11111         return;
11112 }
11113
11114 void
11115 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11116     uint32_t resp_seq, uint32_t result)
11117 {
11118         int len, old_len;
11119         struct sctp_stream_reset_response *resp;
11120         struct sctp_chunkhdr *ch;
11121
11122         ch = mtod(chk->data, struct sctp_chunkhdr *);
11123
11124
11125         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11126
11127         /* get to new offset for the param. */
11128         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11129         /* now how long will this param be? */
11130         len = sizeof(struct sctp_stream_reset_response);
11131         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11132         resp->ph.param_length = htons(len);
11133         resp->response_seq = htonl(resp_seq);
11134         resp->result = ntohl(result);
11135
11136         /* now fix the chunk length */
11137         ch->chunk_length = htons(len + old_len);
11138         chk->book_size = len + old_len;
11139         chk->book_size_scale = 0;
11140         chk->send_size = SCTP_SIZE32(chk->book_size);
11141         SCTP_BUF_LEN(chk->data) = chk->send_size;
11142         return;
11143
11144 }
11145
11146
11147 void
11148 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11149     uint32_t resp_seq, uint32_t result,
11150     uint32_t send_una, uint32_t recv_next)
11151 {
11152         int len, old_len;
11153         struct sctp_stream_reset_response_tsn *resp;
11154         struct sctp_chunkhdr *ch;
11155
11156         ch = mtod(chk->data, struct sctp_chunkhdr *);
11157
11158
11159         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11160
11161         /* get to new offset for the param. */
11162         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11163         /* now how long will this param be? */
11164         len = sizeof(struct sctp_stream_reset_response_tsn);
11165         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11166         resp->ph.param_length = htons(len);
11167         resp->response_seq = htonl(resp_seq);
11168         resp->result = htonl(result);
11169         resp->senders_next_tsn = htonl(send_una);
11170         resp->receivers_next_tsn = htonl(recv_next);
11171
11172         /* now fix the chunk length */
11173         ch->chunk_length = htons(len + old_len);
11174         chk->book_size = len + old_len;
11175         chk->send_size = SCTP_SIZE32(chk->book_size);
11176         chk->book_size_scale = 0;
11177         SCTP_BUF_LEN(chk->data) = chk->send_size;
11178         return;
11179 }
11180
11181 static void
11182 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11183     uint32_t seq,
11184     uint16_t adding)
11185 {
11186         int len, old_len;
11187         struct sctp_chunkhdr *ch;
11188         struct sctp_stream_reset_add_strm *addstr;
11189
11190         ch = mtod(chk->data, struct sctp_chunkhdr *);
11191         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11192
11193         /* get to new offset for the param. */
11194         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11195         /* now how long will this param be? */
11196         len = sizeof(struct sctp_stream_reset_add_strm);
11197
11198         /* Fill it out. */
11199         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11200         addstr->ph.param_length = htons(len);
11201         addstr->request_seq = htonl(seq);
11202         addstr->number_of_streams = htons(adding);
11203         addstr->reserved = 0;
11204
11205         /* now fix the chunk length */
11206         ch->chunk_length = htons(len + old_len);
11207         chk->send_size = len + old_len;
11208         chk->book_size = SCTP_SIZE32(chk->send_size);
11209         chk->book_size_scale = 0;
11210         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11211         return;
11212 }
11213
11214 int
11215 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11216     int number_entries, uint16_t * list,
11217     uint8_t send_out_req,
11218     uint32_t resp_seq,
11219     uint8_t send_in_req,
11220     uint8_t send_tsn_req,
11221     uint8_t add_stream,
11222     uint16_t adding
11223 )
11224 {
11225
11226         struct sctp_association *asoc;
11227         struct sctp_tmit_chunk *chk;
11228         struct sctp_chunkhdr *ch;
11229         uint32_t seq;
11230
11231         asoc = &stcb->asoc;
11232         if (asoc->stream_reset_outstanding) {
11233                 /*-
11234                  * Already one pending, must get ACK back to clear the flag.
11235                  */
11236                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11237                 return (EBUSY);
11238         }
11239         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11240             (add_stream == 0)) {
11241                 /* nothing to do */
11242                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11243                 return (EINVAL);
11244         }
11245         if (send_tsn_req && (send_out_req || send_in_req)) {
11246                 /* error, can't do that */
11247                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11248                 return (EINVAL);
11249         }
11250         sctp_alloc_a_chunk(stcb, chk);
11251         if (chk == NULL) {
11252                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11253                 return (ENOMEM);
11254         }
11255         chk->copy_by_ref = 0;
11256         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11257         chk->rec.chunk_id.can_take_data = 0;
11258         chk->asoc = &stcb->asoc;
11259         chk->book_size = sizeof(struct sctp_chunkhdr);
11260         chk->send_size = SCTP_SIZE32(chk->book_size);
11261         chk->book_size_scale = 0;
11262
11263         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11264         if (chk->data == NULL) {
11265                 sctp_free_a_chunk(stcb, chk);
11266                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11267                 return (ENOMEM);
11268         }
11269         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11270
11271         /* setup chunk parameters */
11272         chk->sent = SCTP_DATAGRAM_UNSENT;
11273         chk->snd_count = 0;
11274         chk->whoTo = asoc->primary_destination;
11275         atomic_add_int(&chk->whoTo->ref_count, 1);
11276
11277         ch = mtod(chk->data, struct sctp_chunkhdr *);
11278         ch->chunk_type = SCTP_STREAM_RESET;
11279         ch->chunk_flags = 0;
11280         ch->chunk_length = htons(chk->book_size);
11281         SCTP_BUF_LEN(chk->data) = chk->send_size;
11282
11283         seq = stcb->asoc.str_reset_seq_out;
11284         if (send_out_req) {
11285                 sctp_add_stream_reset_out(chk, number_entries, list,
11286                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11287                 asoc->stream_reset_out_is_outstanding = 1;
11288                 seq++;
11289                 asoc->stream_reset_outstanding++;
11290         }
11291         if (add_stream) {
11292                 sctp_add_a_stream(chk, seq, adding);
11293                 seq++;
11294                 asoc->stream_reset_outstanding++;
11295         }
11296         if (send_in_req) {
11297                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11298                 asoc->stream_reset_outstanding++;
11299         }
11300         if (send_tsn_req) {
11301                 sctp_add_stream_reset_tsn(chk, seq);
11302                 asoc->stream_reset_outstanding++;
11303         }
11304         asoc->str_reset = chk;
11305
11306         /* insert the chunk for sending */
11307         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11308             chk,
11309             sctp_next);
11310         asoc->ctrl_queue_cnt++;
11311         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11312         return (0);
11313 }
11314
11315 void
11316 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11317     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11318 {
11319         /*-
11320          * Formulate the abort message, and send it back down.
11321          */
11322         struct mbuf *o_pak;
11323         struct mbuf *mout;
11324         struct sctp_abort_msg *abm;
11325         struct ip *iph, *iph_out;
11326         struct udphdr *udp;
11327
11328 #ifdef INET6
11329         struct ip6_hdr *ip6, *ip6_out;
11330
11331 #endif
11332         int iphlen_out, len;
11333
11334         /* don't respond to ABORT with ABORT */
11335         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11336                 if (err_cause)
11337                         sctp_m_freem(err_cause);
11338                 return;
11339         }
11340         iph = mtod(m, struct ip *);
11341         switch (iph->ip_v) {
11342         case IPVERSION:
11343                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11344                 break;
11345 #ifdef INET6
11346         case IPV6_VERSION >> 4:
11347                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11348                 break;
11349 #endif
11350         default:
11351                 if (err_cause) {
11352                         sctp_m_freem(err_cause);
11353                 }
11354                 return;
11355         }
11356         if (port) {
11357                 len += sizeof(struct udphdr);
11358         }
11359         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11360         if (mout == NULL) {
11361                 if (err_cause) {
11362                         sctp_m_freem(err_cause);
11363                 }
11364                 return;
11365         }
11366         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11367         SCTP_BUF_LEN(mout) = len;
11368         SCTP_BUF_NEXT(mout) = err_cause;
11369         iph_out = NULL;
11370 #ifdef INET6
11371         ip6_out = NULL;
11372 #endif
11373         switch (iph->ip_v) {
11374         case IPVERSION:
11375                 iph_out = mtod(mout, struct ip *);
11376
11377                 /* Fill in the IP header for the ABORT */
11378                 iph_out->ip_v = IPVERSION;
11379                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11380                 iph_out->ip_tos = (u_char)0;
11381                 iph_out->ip_id = 0;
11382                 iph_out->ip_off = 0;
11383                 iph_out->ip_ttl = MAXTTL;
11384                 if (port) {
11385                         iph_out->ip_p = IPPROTO_UDP;
11386                 } else {
11387                         iph_out->ip_p = IPPROTO_SCTP;
11388                 }
11389                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11390                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11391                 /* let IP layer calculate this */
11392                 iph_out->ip_sum = 0;
11393
11394                 iphlen_out = sizeof(*iph_out);
11395                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11396                 break;
11397 #ifdef INET6
11398         case IPV6_VERSION >> 4:
11399                 ip6 = (struct ip6_hdr *)iph;
11400                 ip6_out = mtod(mout, struct ip6_hdr *);
11401
11402                 /* Fill in the IP6 header for the ABORT */
11403                 ip6_out->ip6_flow = ip6->ip6_flow;
11404                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11405                 if (port) {
11406                         ip6_out->ip6_nxt = IPPROTO_UDP;
11407                 } else {
11408                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11409                 }
11410                 ip6_out->ip6_src = ip6->ip6_dst;
11411                 ip6_out->ip6_dst = ip6->ip6_src;
11412
11413                 iphlen_out = sizeof(*ip6_out);
11414                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11415                 break;
11416 #endif                          /* INET6 */
11417         default:
11418                 /* Currently not supported */
11419                 sctp_m_freem(mout);
11420                 return;
11421         }
11422
11423         udp = (struct udphdr *)abm;
11424         if (port) {
11425                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11426                 udp->uh_dport = port;
11427                 /* set udp->uh_ulen later */
11428                 udp->uh_sum = 0;
11429                 iphlen_out += sizeof(struct udphdr);
11430                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11431         }
11432         abm->sh.src_port = sh->dest_port;
11433         abm->sh.dest_port = sh->src_port;
11434         abm->sh.checksum = 0;
11435         if (vtag == 0) {
11436                 abm->sh.v_tag = sh->v_tag;
11437                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11438         } else {
11439                 abm->sh.v_tag = htonl(vtag);
11440                 abm->msg.ch.chunk_flags = 0;
11441         }
11442         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11443
11444         if (err_cause) {
11445                 struct mbuf *m_tmp = err_cause;
11446                 int err_len = 0;
11447
11448                 /* get length of the err_cause chain */
11449                 while (m_tmp != NULL) {
11450                         err_len += SCTP_BUF_LEN(m_tmp);
11451                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11452                 }
11453                 len = SCTP_BUF_LEN(mout) + err_len;
11454                 if (err_len % 4) {
11455                         /* need pad at end of chunk */
11456                         uint32_t cpthis = 0;
11457                         int padlen;
11458
11459                         padlen = 4 - (len % 4);
11460                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11461                         len += padlen;
11462                 }
11463                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11464         } else {
11465                 len = SCTP_BUF_LEN(mout);
11466                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11467         }
11468
11469         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11470                 /* no mbuf's */
11471                 sctp_m_freem(mout);
11472                 return;
11473         }
11474         if (iph_out != NULL) {
11475                 sctp_route_t ro;
11476                 int ret;
11477
11478                 /* zap the stack pointer to the route */
11479                 bzero(&ro, sizeof ro);
11480                 if (port) {
11481                         udp->uh_ulen = htons(len - sizeof(struct ip));
11482                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11483                 }
11484                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11485                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11486                 /* set IPv4 length */
11487                 iph_out->ip_len = len;
11488                 /* out it goes */
11489 #ifdef  SCTP_PACKET_LOGGING
11490                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11491                         sctp_packet_log(mout, len);
11492 #endif
11493                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11494                 if (port) {
11495 #if defined(SCTP_WITH_NO_CSUM)
11496                         SCTP_STAT_INCR(sctps_sendnocrc);
11497 #else
11498                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11499                         SCTP_STAT_INCR(sctps_sendswcrc);
11500 #endif
11501                         SCTP_ENABLE_UDP_CSUM(o_pak);
11502                 } else {
11503 #if defined(SCTP_WITH_NO_CSUM)
11504                         SCTP_STAT_INCR(sctps_sendnocrc);
11505 #else
11506                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11507                         mout->m_pkthdr.csum_data = 0;
11508                         SCTP_STAT_INCR(sctps_sendhwcrc);
11509 #endif
11510                 }
11511                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11512
11513                 /* Free the route if we got one back */
11514                 if (ro.ro_rt)
11515                         RTFREE(ro.ro_rt);
11516         }
11517 #ifdef INET6
11518         if (ip6_out != NULL) {
11519                 struct route_in6 ro;
11520                 int ret;
11521                 struct ifnet *ifp = NULL;
11522
11523                 /* zap the stack pointer to the route */
11524                 bzero(&ro, sizeof(ro));
11525                 if (port) {
11526                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11527                 }
11528                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11529                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11530                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11531 #ifdef  SCTP_PACKET_LOGGING
11532                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11533                         sctp_packet_log(mout, len);
11534 #endif
11535                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11536                 if (port) {
11537 #if defined(SCTP_WITH_NO_CSUM)
11538                         SCTP_STAT_INCR(sctps_sendnocrc);
11539 #else
11540                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11541                         SCTP_STAT_INCR(sctps_sendswcrc);
11542 #endif
11543                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11544                                 udp->uh_sum = 0xffff;
11545                         }
11546                 } else {
11547 #if defined(SCTP_WITH_NO_CSUM)
11548                         SCTP_STAT_INCR(sctps_sendnocrc);
11549 #else
11550                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11551                         mout->m_pkthdr.csum_data = 0;
11552                         SCTP_STAT_INCR(sctps_sendhwcrc);
11553 #endif
11554                 }
11555                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11556
11557                 /* Free the route if we got one back */
11558                 if (ro.ro_rt)
11559                         RTFREE(ro.ro_rt);
11560         }
11561 #endif
11562         SCTP_STAT_INCR(sctps_sendpackets);
11563         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11564         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11565 }
11566
11567 void
11568 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11569     uint32_t vrf_id, uint16_t port)
11570 {
11571         struct mbuf *o_pak;
11572         struct sctphdr *sh, *sh_out;
11573         struct sctp_chunkhdr *ch;
11574         struct ip *iph, *iph_out;
11575         struct udphdr *udp = NULL;
11576         struct mbuf *mout;
11577
11578 #ifdef INET6
11579         struct ip6_hdr *ip6, *ip6_out;
11580
11581 #endif
11582         int iphlen_out, len;
11583
11584         iph = mtod(m, struct ip *);
11585         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11586         switch (iph->ip_v) {
11587         case IPVERSION:
11588                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11589                 break;
11590 #ifdef INET6
11591         case IPV6_VERSION >> 4:
11592                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11593                 break;
11594 #endif
11595         default:
11596                 if (scm) {
11597                         sctp_m_freem(scm);
11598                 }
11599                 return;
11600         }
11601         if (port) {
11602                 len += sizeof(struct udphdr);
11603         }
11604         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11605         if (mout == NULL) {
11606                 if (scm) {
11607                         sctp_m_freem(scm);
11608                 }
11609                 return;
11610         }
11611         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11612         SCTP_BUF_LEN(mout) = len;
11613         SCTP_BUF_NEXT(mout) = scm;
11614         iph_out = NULL;
11615 #ifdef INET6
11616         ip6_out = NULL;
11617 #endif
11618         switch (iph->ip_v) {
11619         case IPVERSION:
11620                 iph_out = mtod(mout, struct ip *);
11621
11622                 /* Fill in the IP header for the ABORT */
11623                 iph_out->ip_v = IPVERSION;
11624                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11625                 iph_out->ip_tos = (u_char)0;
11626                 iph_out->ip_id = 0;
11627                 iph_out->ip_off = 0;
11628                 iph_out->ip_ttl = MAXTTL;
11629                 if (port) {
11630                         iph_out->ip_p = IPPROTO_UDP;
11631                 } else {
11632                         iph_out->ip_p = IPPROTO_SCTP;
11633                 }
11634                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11635                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11636                 /* let IP layer calculate this */
11637                 iph_out->ip_sum = 0;
11638
11639                 iphlen_out = sizeof(struct ip);
11640                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11641                 break;
11642 #ifdef INET6
11643         case IPV6_VERSION >> 4:
11644                 ip6 = (struct ip6_hdr *)iph;
11645                 ip6_out = mtod(mout, struct ip6_hdr *);
11646
11647                 /* Fill in the IP6 header for the ABORT */
11648                 ip6_out->ip6_flow = ip6->ip6_flow;
11649                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11650                 if (port) {
11651                         ip6_out->ip6_nxt = IPPROTO_UDP;
11652                 } else {
11653                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11654                 }
11655                 ip6_out->ip6_src = ip6->ip6_dst;
11656                 ip6_out->ip6_dst = ip6->ip6_src;
11657
11658                 iphlen_out = sizeof(struct ip6_hdr);
11659                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11660                 break;
11661 #endif                          /* INET6 */
11662         default:
11663                 /* Currently not supported */
11664                 sctp_m_freem(mout);
11665                 return;
11666         }
11667
11668         udp = (struct udphdr *)sh_out;
11669         if (port) {
11670                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11671                 udp->uh_dport = port;
11672                 /* set udp->uh_ulen later */
11673                 udp->uh_sum = 0;
11674                 iphlen_out += sizeof(struct udphdr);
11675                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11676         }
11677         sh_out->src_port = sh->dest_port;
11678         sh_out->dest_port = sh->src_port;
11679         sh_out->v_tag = vtag;
11680         sh_out->checksum = 0;
11681
11682         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11683         ch->chunk_type = SCTP_OPERATION_ERROR;
11684         ch->chunk_flags = 0;
11685
11686         if (scm) {
11687                 struct mbuf *m_tmp = scm;
11688                 int cause_len = 0;
11689
11690                 /* get length of the err_cause chain */
11691                 while (m_tmp != NULL) {
11692                         cause_len += SCTP_BUF_LEN(m_tmp);
11693                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11694                 }
11695                 len = SCTP_BUF_LEN(mout) + cause_len;
11696                 if (cause_len % 4) {
11697                         /* need pad at end of chunk */
11698                         uint32_t cpthis = 0;
11699                         int padlen;
11700
11701                         padlen = 4 - (len % 4);
11702                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11703                         len += padlen;
11704                 }
11705                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11706         } else {
11707                 len = SCTP_BUF_LEN(mout);
11708                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11709         }
11710
11711         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11712                 /* no mbuf's */
11713                 sctp_m_freem(mout);
11714                 return;
11715         }
11716         if (iph_out != NULL) {
11717                 sctp_route_t ro;
11718                 int ret;
11719
11720                 /* zap the stack pointer to the route */
11721                 bzero(&ro, sizeof ro);
11722                 if (port) {
11723                         udp->uh_ulen = htons(len - sizeof(struct ip));
11724                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11725                 }
11726                 /* set IPv4 length */
11727                 iph_out->ip_len = len;
11728                 /* out it goes */
11729 #ifdef  SCTP_PACKET_LOGGING
11730                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11731                         sctp_packet_log(mout, len);
11732 #endif
11733                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11734                 if (port) {
11735 #if defined(SCTP_WITH_NO_CSUM)
11736                         SCTP_STAT_INCR(sctps_sendnocrc);
11737 #else
11738                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11739                         SCTP_STAT_INCR(sctps_sendswcrc);
11740 #endif
11741                         SCTP_ENABLE_UDP_CSUM(o_pak);
11742                 } else {
11743 #if defined(SCTP_WITH_NO_CSUM)
11744                         SCTP_STAT_INCR(sctps_sendnocrc);
11745 #else
11746                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11747                         mout->m_pkthdr.csum_data = 0;
11748                         SCTP_STAT_INCR(sctps_sendhwcrc);
11749 #endif
11750                 }
11751                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11752
11753                 /* Free the route if we got one back */
11754                 if (ro.ro_rt)
11755                         RTFREE(ro.ro_rt);
11756         }
11757 #ifdef INET6
11758         if (ip6_out != NULL) {
11759                 struct route_in6 ro;
11760                 int ret;
11761                 struct ifnet *ifp = NULL;
11762
11763                 /* zap the stack pointer to the route */
11764                 bzero(&ro, sizeof(ro));
11765                 if (port) {
11766                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11767                 }
11768                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11769 #ifdef  SCTP_PACKET_LOGGING
11770                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11771                         sctp_packet_log(mout, len);
11772 #endif
11773                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11774                 if (port) {
11775 #if defined(SCTP_WITH_NO_CSUM)
11776                         SCTP_STAT_INCR(sctps_sendnocrc);
11777 #else
11778                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11779                         SCTP_STAT_INCR(sctps_sendswcrc);
11780 #endif
11781                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11782                                 udp->uh_sum = 0xffff;
11783                         }
11784                 } else {
11785 #if defined(SCTP_WITH_NO_CSUM)
11786                         SCTP_STAT_INCR(sctps_sendnocrc);
11787 #else
11788                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11789                         mout->m_pkthdr.csum_data = 0;
11790                         SCTP_STAT_INCR(sctps_sendhwcrc);
11791 #endif
11792                 }
11793                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11794
11795                 /* Free the route if we got one back */
11796                 if (ro.ro_rt)
11797                         RTFREE(ro.ro_rt);
11798         }
11799 #endif
11800         SCTP_STAT_INCR(sctps_sendpackets);
11801         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11802         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11803 }
11804
11805 static struct mbuf *
11806 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11807     struct uio *uio,
11808     struct sctp_sndrcvinfo *srcv,
11809     int max_send_len,
11810     int user_marks_eor,
11811     int *error,
11812     uint32_t * sndout,
11813     struct mbuf **new_tail)
11814 {
11815         struct mbuf *m;
11816
11817         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11818             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11819         if (m == NULL) {
11820                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11821                 *error = ENOMEM;
11822         } else {
11823                 *sndout = m_length(m, NULL);
11824                 *new_tail = m_last(m);
11825         }
11826         return (m);
11827 }
11828
11829 static int
11830 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11831     struct uio *uio,
11832     int resv_upfront)
11833 {
11834         int left;
11835
11836         left = sp->length;
11837         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11838             resv_upfront, 0);
11839         if (sp->data == NULL) {
11840                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11841                 return (ENOMEM);
11842         }
11843         sp->tail_mbuf = m_last(sp->data);
11844         return (0);
11845 }
11846
11847
11848
11849 static struct sctp_stream_queue_pending *
11850 sctp_copy_it_in(struct sctp_tcb *stcb,
11851     struct sctp_association *asoc,
11852     struct sctp_sndrcvinfo *srcv,
11853     struct uio *uio,
11854     struct sctp_nets *net,
11855     int max_send_len,
11856     int user_marks_eor,
11857     int *error,
11858     int non_blocking)
11859 {
11860         /*-
11861          * This routine must be very careful in its work. Protocol
11862          * processing is up and running so care must be taken to spl...()
11863          * when you need to do something that may effect the stcb/asoc. The
11864          * sb is locked however. When data is copied the protocol processing
11865          * should be enabled since this is a slower operation...
11866          */
11867         struct sctp_stream_queue_pending *sp = NULL;
11868         int resv_in_first;
11869
11870         *error = 0;
11871         /* Now can we send this? */
11872         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11873             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11874             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11875             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11876                 /* got data while shutting down */
11877                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11878                 *error = ECONNRESET;
11879                 goto out_now;
11880         }
11881         sctp_alloc_a_strmoq(stcb, sp);
11882         if (sp == NULL) {
11883                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11884                 *error = ENOMEM;
11885                 goto out_now;
11886         }
11887         sp->act_flags = 0;
11888         sp->sender_all_done = 0;
11889         sp->sinfo_flags = srcv->sinfo_flags;
11890         sp->timetolive = srcv->sinfo_timetolive;
11891         sp->ppid = srcv->sinfo_ppid;
11892         sp->context = srcv->sinfo_context;
11893         sp->strseq = 0;
11894         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11895
11896         sp->stream = srcv->sinfo_stream;
11897         sp->length = min(uio->uio_resid, max_send_len);
11898         if ((sp->length == (uint32_t) uio->uio_resid) &&
11899             ((user_marks_eor == 0) ||
11900             (srcv->sinfo_flags & SCTP_EOF) ||
11901             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11902                 sp->msg_is_complete = 1;
11903         } else {
11904                 sp->msg_is_complete = 0;
11905         }
11906         sp->sender_all_done = 0;
11907         sp->some_taken = 0;
11908         sp->put_last_out = 0;
11909         resv_in_first = sizeof(struct sctp_data_chunk);
11910         sp->data = sp->tail_mbuf = NULL;
11911         if (sp->length == 0) {
11912                 *error = 0;
11913                 goto skip_copy;
11914         }
11915         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
11916         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
11917                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
11918                 sp->holds_key_ref = 1;
11919         }
11920         *error = sctp_copy_one(sp, uio, resv_in_first);
11921 skip_copy:
11922         if (*error) {
11923                 sctp_free_a_strmoq(stcb, sp);
11924                 sp = NULL;
11925         } else {
11926                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
11927                         sp->net = net;
11928                         atomic_add_int(&sp->net->ref_count, 1);
11929                 } else {
11930                         sp->net = NULL;
11931                 }
11932                 sctp_set_prsctp_policy(sp);
11933         }
11934 out_now:
11935         return (sp);
11936 }
11937
11938
11939 int
11940 sctp_sosend(struct socket *so,
11941     struct sockaddr *addr,
11942     struct uio *uio,
11943     struct mbuf *top,
11944     struct mbuf *control,
11945     int flags,
11946     struct thread *p
11947 )
11948 {
11949         int error, use_rcvinfo = 0;
11950         struct sctp_sndrcvinfo srcv;
11951         struct sockaddr *addr_to_use;
11952
11953 #if defined(INET) && defined(INET6)
11954         struct sockaddr_in sin;
11955
11956 #endif
11957
11958         if (control) {
11959                 /* process cmsg snd/rcv info (maybe a assoc-id) */
11960                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
11961                     sizeof(srcv))) {
11962                         /* got one */
11963                         use_rcvinfo = 1;
11964                 }
11965         }
11966         addr_to_use = addr;
11967 #if defined(INET) && defined(INET6)
11968         if ((addr) && (addr->sa_family == AF_INET6)) {
11969                 struct sockaddr_in6 *sin6;
11970
11971                 sin6 = (struct sockaddr_in6 *)addr;
11972                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
11973                         in6_sin6_2_sin(&sin, sin6);
11974                         addr_to_use = (struct sockaddr *)&sin;
11975                 }
11976         }
11977 #endif
11978         error = sctp_lower_sosend(so, addr_to_use, uio, top,
11979             control,
11980             flags,
11981             use_rcvinfo ? &srcv : NULL
11982             ,p
11983             );
11984         return (error);
11985 }
11986
11987
11988 int
11989 sctp_lower_sosend(struct socket *so,
11990     struct sockaddr *addr,
11991     struct uio *uio,
11992     struct mbuf *i_pak,
11993     struct mbuf *control,
11994     int flags,
11995     struct sctp_sndrcvinfo *srcv
11996     ,
11997     struct thread *p
11998 )
11999 {
12000         unsigned int sndlen = 0, max_len;
12001         int error, len;
12002         struct mbuf *top = NULL;
12003         int queue_only = 0, queue_only_for_init = 0;
12004         int free_cnt_applied = 0;
12005         int un_sent;
12006         int now_filled = 0;
12007         unsigned int inqueue_bytes = 0;
12008         struct sctp_block_entry be;
12009         struct sctp_inpcb *inp;
12010         struct sctp_tcb *stcb = NULL;
12011         struct timeval now;
12012         struct sctp_nets *net;
12013         struct sctp_association *asoc;
12014         struct sctp_inpcb *t_inp;
12015         int user_marks_eor;
12016         int create_lock_applied = 0;
12017         int nagle_applies = 0;
12018         int some_on_control = 0;
12019         int got_all_of_the_send = 0;
12020         int hold_tcblock = 0;
12021         int non_blocking = 0;
12022         uint32_t local_add_more, local_soresv = 0;
12023         uint16_t port;
12024         uint16_t sinfo_flags;
12025         sctp_assoc_t sinfo_assoc_id;
12026
12027         error = 0;
12028         net = NULL;
12029         stcb = NULL;
12030         asoc = NULL;
12031
12032         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12033         if (inp == NULL) {
12034                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12035                 error = EINVAL;
12036                 if (i_pak) {
12037                         SCTP_RELEASE_PKT(i_pak);
12038                 }
12039                 return (error);
12040         }
12041         if ((uio == NULL) && (i_pak == NULL)) {
12042                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12043                 return (EINVAL);
12044         }
12045         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12046         atomic_add_int(&inp->total_sends, 1);
12047         if (uio) {
12048                 if (uio->uio_resid < 0) {
12049                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12050                         return (EINVAL);
12051                 }
12052                 sndlen = uio->uio_resid;
12053         } else {
12054                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12055                 sndlen = SCTP_HEADER_LEN(i_pak);
12056         }
12057         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12058             addr,
12059             sndlen);
12060         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12061             (inp->sctp_socket->so_qlimit)) {
12062                 /* The listener can NOT send */
12063                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12064                 error = ENOTCONN;
12065                 goto out_unlocked;
12066         }
12067         /**
12068          * Pre-screen address, if one is given the sin-len
12069          * must be set correctly!
12070          */
12071         if (addr) {
12072                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12073
12074                 switch (raddr->sa.sa_family) {
12075 #if defined(INET)
12076                 case AF_INET:
12077                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12078                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12079                                 error = EINVAL;
12080                                 goto out_unlocked;
12081                         }
12082                         port = raddr->sin.sin_port;
12083                         break;
12084 #endif
12085 #if defined(INET6)
12086                 case AF_INET6:
12087                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12088                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12089                                 error = EINVAL;
12090                                 goto out_unlocked;
12091                         }
12092                         port = raddr->sin6.sin6_port;
12093                         break;
12094 #endif
12095                 default:
12096                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12097                         error = EAFNOSUPPORT;
12098                         goto out_unlocked;
12099                 }
12100         } else
12101                 port = 0;
12102
12103         if (srcv) {
12104                 sinfo_flags = srcv->sinfo_flags;
12105                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12106                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12107                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12108                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12109                         error = EINVAL;
12110                         goto out_unlocked;
12111                 }
12112                 if (srcv->sinfo_flags)
12113                         SCTP_STAT_INCR(sctps_sends_with_flags);
12114         } else {
12115                 sinfo_flags = inp->def_send.sinfo_flags;
12116                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12117         }
12118         if (sinfo_flags & SCTP_SENDALL) {
12119                 /* its a sendall */
12120                 error = sctp_sendall(inp, uio, top, srcv);
12121                 top = NULL;
12122                 goto out_unlocked;
12123         }
12124         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12125                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12126                 error = EINVAL;
12127                 goto out_unlocked;
12128         }
12129         /* now we must find the assoc */
12130         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12131             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12132                 SCTP_INP_RLOCK(inp);
12133                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12134                 if (stcb == NULL) {
12135                         SCTP_INP_RUNLOCK(inp);
12136                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12137                         error = ENOTCONN;
12138                         goto out_unlocked;
12139                 }
12140                 SCTP_TCB_LOCK(stcb);
12141                 hold_tcblock = 1;
12142                 SCTP_INP_RUNLOCK(inp);
12143         } else if (sinfo_assoc_id) {
12144                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12145         } else if (addr) {
12146                 /*-
12147                  * Since we did not use findep we must
12148                  * increment it, and if we don't find a tcb
12149                  * decrement it.
12150                  */
12151                 SCTP_INP_WLOCK(inp);
12152                 SCTP_INP_INCR_REF(inp);
12153                 SCTP_INP_WUNLOCK(inp);
12154                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12155                 if (stcb == NULL) {
12156                         SCTP_INP_WLOCK(inp);
12157                         SCTP_INP_DECR_REF(inp);
12158                         SCTP_INP_WUNLOCK(inp);
12159                 } else {
12160                         hold_tcblock = 1;
12161                 }
12162         }
12163         if ((stcb == NULL) && (addr)) {
12164                 /* Possible implicit send? */
12165                 SCTP_ASOC_CREATE_LOCK(inp);
12166                 create_lock_applied = 1;
12167                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12168                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12169                         /* Should I really unlock ? */
12170                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12171                         error = EINVAL;
12172                         goto out_unlocked;
12173
12174                 }
12175                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12176                     (addr->sa_family == AF_INET6)) {
12177                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12178                         error = EINVAL;
12179                         goto out_unlocked;
12180                 }
12181                 SCTP_INP_WLOCK(inp);
12182                 SCTP_INP_INCR_REF(inp);
12183                 SCTP_INP_WUNLOCK(inp);
12184                 /* With the lock applied look again */
12185                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12186                 if (stcb == NULL) {
12187                         SCTP_INP_WLOCK(inp);
12188                         SCTP_INP_DECR_REF(inp);
12189                         SCTP_INP_WUNLOCK(inp);
12190                 } else {
12191                         hold_tcblock = 1;
12192                 }
12193                 if (t_inp != inp) {
12194                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12195                         error = ENOTCONN;
12196                         goto out_unlocked;
12197                 }
12198         }
12199         if (stcb == NULL) {
12200                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12201                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12202                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12203                         error = ENOTCONN;
12204                         goto out_unlocked;
12205                 }
12206                 if (addr == NULL) {
12207                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12208                         error = ENOENT;
12209                         goto out_unlocked;
12210                 } else {
12211                         /*
12212                          * UDP style, we must go ahead and start the INIT
12213                          * process
12214                          */
12215                         uint32_t vrf_id;
12216
12217                         if ((sinfo_flags & SCTP_ABORT) ||
12218                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12219                                 /*-
12220                                  * User asks to abort a non-existant assoc,
12221                                  * or EOF a non-existant assoc with no data
12222                                  */
12223                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12224                                 error = ENOENT;
12225                                 goto out_unlocked;
12226                         }
12227                         /* get an asoc/stcb struct */
12228                         vrf_id = inp->def_vrf_id;
12229 #ifdef INVARIANTS
12230                         if (create_lock_applied == 0) {
12231                                 panic("Error, should hold create lock and I don't?");
12232                         }
12233 #endif
12234                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12235                             p
12236                             );
12237                         if (stcb == NULL) {
12238                                 /* Error is setup for us in the call */
12239                                 goto out_unlocked;
12240                         }
12241                         if (create_lock_applied) {
12242                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12243                                 create_lock_applied = 0;
12244                         } else {
12245                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12246                         }
12247                         /*
12248                          * Turn on queue only flag to prevent data from
12249                          * being sent
12250                          */
12251                         queue_only = 1;
12252                         asoc = &stcb->asoc;
12253                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12254                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12255
12256                         /* initialize authentication params for the assoc */
12257                         sctp_initialize_auth_params(inp, stcb);
12258
12259                         if (control) {
12260                                 /*
12261                                  * see if a init structure exists in cmsg
12262                                  * headers
12263                                  */
12264                                 struct sctp_initmsg initm;
12265                                 int i;
12266
12267                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12268                                     sizeof(initm))) {
12269                                         /*
12270                                          * we have an INIT override of the
12271                                          * default
12272                                          */
12273                                         if (initm.sinit_max_attempts)
12274                                                 asoc->max_init_times = initm.sinit_max_attempts;
12275                                         if (initm.sinit_num_ostreams)
12276                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12277                                         if (initm.sinit_max_instreams)
12278                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12279                                         if (initm.sinit_max_init_timeo)
12280                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12281                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12282                                                 struct sctp_stream_out *tmp_str;
12283                                                 int had_lock = 0;
12284
12285                                                 /* Default is NOT correct */
12286                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12287                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12288                                                 /*
12289                                                  * What happens if this
12290                                                  * fails? we panic ...
12291                                                  */
12292
12293                                                 if (hold_tcblock) {
12294                                                         had_lock = 1;
12295                                                         SCTP_TCB_UNLOCK(stcb);
12296                                                 }
12297                                                 SCTP_MALLOC(tmp_str,
12298                                                     struct sctp_stream_out *,
12299                                                     (asoc->pre_open_streams *
12300                                                     sizeof(struct sctp_stream_out)),
12301                                                     SCTP_M_STRMO);
12302                                                 if (had_lock) {
12303                                                         SCTP_TCB_LOCK(stcb);
12304                                                 }
12305                                                 if (tmp_str != NULL) {
12306                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12307                                                         asoc->strmout = tmp_str;
12308                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12309                                                 } else {
12310                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12311                                                 }
12312                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12313                                                         /*-
12314                                                          * inbound side must be set
12315                                                          * to 0xffff, also NOTE when
12316                                                          * we get the INIT-ACK back
12317                                                          * (for INIT sender) we MUST
12318                                                          * reduce the count
12319                                                          * (streamoutcnt) but first
12320                                                          * check if we sent to any
12321                                                          * of the upper streams that
12322                                                          * were dropped (if some
12323                                                          * were). Those that were
12324                                                          * dropped must be notified
12325                                                          * to the upper layer as
12326                                                          * failed to send.
12327                                                          */
12328                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12329                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12330                                                         asoc->strmout[i].stream_no = i;
12331                                                         asoc->strmout[i].last_msg_incomplete = 0;
12332                                                         asoc->ss_functions.sctp_ss_init_stream(&asoc->strmout[i]);
12333                                                 }
12334                                         }
12335                                 }
12336                         }
12337                         hold_tcblock = 1;
12338                         /* out with the INIT */
12339                         queue_only_for_init = 1;
12340                         /*-
12341                          * we may want to dig in after this call and adjust the MTU
12342                          * value. It defaulted to 1500 (constant) but the ro
12343                          * structure may now have an update and thus we may need to
12344                          * change it BEFORE we append the message.
12345                          */
12346                 }
12347         } else
12348                 asoc = &stcb->asoc;
12349         if (srcv == NULL)
12350                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12351         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12352                 if (addr)
12353                         net = sctp_findnet(stcb, addr);
12354                 else
12355                         net = NULL;
12356                 if ((net == NULL) ||
12357                     ((port != 0) && (port != stcb->rport))) {
12358                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12359                         error = EINVAL;
12360                         goto out_unlocked;
12361                 }
12362         } else {
12363                 net = stcb->asoc.primary_destination;
12364         }
12365         atomic_add_int(&stcb->total_sends, 1);
12366         /* Keep the stcb from being freed under our feet */
12367         atomic_add_int(&asoc->refcnt, 1);
12368         free_cnt_applied = 1;
12369
12370         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12371                 if (sndlen > asoc->smallest_mtu) {
12372                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12373                         error = EMSGSIZE;
12374                         goto out_unlocked;
12375                 }
12376         }
12377         if ((SCTP_SO_IS_NBIO(so)
12378             || (flags & MSG_NBIO)
12379             )) {
12380                 non_blocking = 1;
12381         }
12382         /* would we block? */
12383         if (non_blocking) {
12384                 if (hold_tcblock == 0) {
12385                         SCTP_TCB_LOCK(stcb);
12386                         hold_tcblock = 1;
12387                 }
12388                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12389                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12390                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12391                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12392                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12393                                 error = EMSGSIZE;
12394                         else
12395                                 error = EWOULDBLOCK;
12396                         goto out_unlocked;
12397                 }
12398                 stcb->asoc.sb_send_resv += sndlen;
12399                 SCTP_TCB_UNLOCK(stcb);
12400                 hold_tcblock = 0;
12401         } else {
12402                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12403         }
12404         local_soresv = sndlen;
12405         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12406                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12407                 error = ECONNRESET;
12408                 goto out_unlocked;
12409         }
12410         if (create_lock_applied) {
12411                 SCTP_ASOC_CREATE_UNLOCK(inp);
12412                 create_lock_applied = 0;
12413         }
12414         if (asoc->stream_reset_outstanding) {
12415                 /*
12416                  * Can't queue any data while stream reset is underway.
12417                  */
12418                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12419                 error = EAGAIN;
12420                 goto out_unlocked;
12421         }
12422         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12423             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12424                 queue_only = 1;
12425         }
12426         /* we are now done with all control */
12427         if (control) {
12428                 sctp_m_freem(control);
12429                 control = NULL;
12430         }
12431         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12432             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12433             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12434             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12435                 if (srcv->sinfo_flags & SCTP_ABORT) {
12436                         ;
12437                 } else {
12438                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12439                         error = ECONNRESET;
12440                         goto out_unlocked;
12441                 }
12442         }
12443         /* Ok, we will attempt a msgsnd :> */
12444         if (p) {
12445                 p->td_ru.ru_msgsnd++;
12446         }
12447         /* Are we aborting? */
12448         if (srcv->sinfo_flags & SCTP_ABORT) {
12449                 struct mbuf *mm;
12450                 int tot_demand, tot_out = 0, max_out;
12451
12452                 SCTP_STAT_INCR(sctps_sends_with_abort);
12453                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12454                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12455                         /* It has to be up before we abort */
12456                         /* how big is the user initiated abort? */
12457                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12458                         error = EINVAL;
12459                         goto out;
12460                 }
12461                 if (hold_tcblock) {
12462                         SCTP_TCB_UNLOCK(stcb);
12463                         hold_tcblock = 0;
12464                 }
12465                 if (top) {
12466                         struct mbuf *cntm = NULL;
12467
12468                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12469                         if (sndlen != 0) {
12470                                 cntm = top;
12471                                 while (cntm) {
12472                                         tot_out += SCTP_BUF_LEN(cntm);
12473                                         cntm = SCTP_BUF_NEXT(cntm);
12474                                 }
12475                         }
12476                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12477                 } else {
12478                         /* Must fit in a MTU */
12479                         tot_out = sndlen;
12480                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12481                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12482                                 /* To big */
12483                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12484                                 error = EMSGSIZE;
12485                                 goto out;
12486                         }
12487                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12488                 }
12489                 if (mm == NULL) {
12490                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12491                         error = ENOMEM;
12492                         goto out;
12493                 }
12494                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12495                 max_out -= sizeof(struct sctp_abort_msg);
12496                 if (tot_out > max_out) {
12497                         tot_out = max_out;
12498                 }
12499                 if (mm) {
12500                         struct sctp_paramhdr *ph;
12501
12502                         /* now move forward the data pointer */
12503                         ph = mtod(mm, struct sctp_paramhdr *);
12504                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12505                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12506                         ph++;
12507                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12508                         if (top == NULL) {
12509                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12510                                 if (error) {
12511                                         /*-
12512                                          * Here if we can't get his data we
12513                                          * still abort we just don't get to
12514                                          * send the users note :-0
12515                                          */
12516                                         sctp_m_freem(mm);
12517                                         mm = NULL;
12518                                 }
12519                         } else {
12520                                 if (sndlen != 0) {
12521                                         SCTP_BUF_NEXT(mm) = top;
12522                                 }
12523                         }
12524                 }
12525                 if (hold_tcblock == 0) {
12526                         SCTP_TCB_LOCK(stcb);
12527                         hold_tcblock = 1;
12528                 }
12529                 atomic_add_int(&stcb->asoc.refcnt, -1);
12530                 free_cnt_applied = 0;
12531                 /* release this lock, otherwise we hang on ourselves */
12532                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12533                     SCTP_RESPONSE_TO_USER_REQ,
12534                     mm, SCTP_SO_LOCKED);
12535                 /* now relock the stcb so everything is sane */
12536                 hold_tcblock = 0;
12537                 stcb = NULL;
12538                 /*
12539                  * In this case top is already chained to mm avoid double
12540                  * free, since we free it below if top != NULL and driver
12541                  * would free it after sending the packet out
12542                  */
12543                 if (sndlen != 0) {
12544                         top = NULL;
12545                 }
12546                 goto out_unlocked;
12547         }
12548         /* Calculate the maximum we can send */
12549         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12550         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12551                 if (non_blocking) {
12552                         /* we already checked for non-blocking above. */
12553                         max_len = sndlen;
12554                 } else {
12555                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12556                 }
12557         } else {
12558                 max_len = 0;
12559         }
12560         if (hold_tcblock) {
12561                 SCTP_TCB_UNLOCK(stcb);
12562                 hold_tcblock = 0;
12563         }
12564         /* Is the stream no. valid? */
12565         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12566                 /* Invalid stream number */
12567                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12568                 error = EINVAL;
12569                 goto out_unlocked;
12570         }
12571         if (asoc->strmout == NULL) {
12572                 /* huh? software error */
12573                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12574                 error = EFAULT;
12575                 goto out_unlocked;
12576         }
12577         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12578         if ((user_marks_eor == 0) &&
12579             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12580                 /* It will NEVER fit */
12581                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12582                 error = EMSGSIZE;
12583                 goto out_unlocked;
12584         }
12585         if ((uio == NULL) && user_marks_eor) {
12586                 /*-
12587                  * We do not support eeor mode for
12588                  * sending with mbuf chains (like sendfile).
12589                  */
12590                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12591                 error = EINVAL;
12592                 goto out_unlocked;
12593         }
12594         if (user_marks_eor) {
12595                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12596         } else {
12597                 /*-
12598                  * For non-eeor the whole message must fit in
12599                  * the socket send buffer.
12600                  */
12601                 local_add_more = sndlen;
12602         }
12603         len = 0;
12604         if (non_blocking) {
12605                 goto skip_preblock;
12606         }
12607         if (((max_len <= local_add_more) &&
12608             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12609             (max_len == 0) ||
12610             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12611                 /* No room right now ! */
12612                 SOCKBUF_LOCK(&so->so_snd);
12613                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12614                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12615                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12616                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12617                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12618                             inqueue_bytes,
12619                             local_add_more,
12620                             stcb->asoc.stream_queue_cnt,
12621                             stcb->asoc.chunks_on_out_queue,
12622                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12623                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12624                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12625                         }
12626                         be.error = 0;
12627                         stcb->block_entry = &be;
12628                         error = sbwait(&so->so_snd);
12629                         stcb->block_entry = NULL;
12630                         if (error || so->so_error || be.error) {
12631                                 if (error == 0) {
12632                                         if (so->so_error)
12633                                                 error = so->so_error;
12634                                         if (be.error) {
12635                                                 error = be.error;
12636                                         }
12637                                 }
12638                                 SOCKBUF_UNLOCK(&so->so_snd);
12639                                 goto out_unlocked;
12640                         }
12641                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12642                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12643                                     so, asoc, stcb->asoc.total_output_queue_size);
12644                         }
12645                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12646                                 goto out_unlocked;
12647                         }
12648                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12649                 }
12650                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12651                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12652                 } else {
12653                         max_len = 0;
12654                 }
12655                 SOCKBUF_UNLOCK(&so->so_snd);
12656         }
12657 skip_preblock:
12658         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12659                 goto out_unlocked;
12660         }
12661         /*
12662          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12663          * case NOTE: uio will be null when top/mbuf is passed
12664          */
12665         if (sndlen == 0) {
12666                 if (srcv->sinfo_flags & SCTP_EOF) {
12667                         got_all_of_the_send = 1;
12668                         goto dataless_eof;
12669                 } else {
12670                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12671                         error = EINVAL;
12672                         goto out;
12673                 }
12674         }
12675         if (top == NULL) {
12676                 struct sctp_stream_queue_pending *sp;
12677                 struct sctp_stream_out *strm;
12678                 uint32_t sndout;
12679
12680                 SCTP_TCB_SEND_LOCK(stcb);
12681                 if ((asoc->stream_locked) &&
12682                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12683                         SCTP_TCB_SEND_UNLOCK(stcb);
12684                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12685                         error = EINVAL;
12686                         goto out;
12687                 }
12688                 SCTP_TCB_SEND_UNLOCK(stcb);
12689
12690                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12691                 if (strm->last_msg_incomplete == 0) {
12692         do_a_copy_in:
12693                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12694                         if ((sp == NULL) || (error)) {
12695                                 goto out;
12696                         }
12697                         SCTP_TCB_SEND_LOCK(stcb);
12698                         if (sp->msg_is_complete) {
12699                                 strm->last_msg_incomplete = 0;
12700                                 asoc->stream_locked = 0;
12701                         } else {
12702                                 /*
12703                                  * Just got locked to this guy in case of an
12704                                  * interrupt.
12705                                  */
12706                                 strm->last_msg_incomplete = 1;
12707                                 asoc->stream_locked = 1;
12708                                 asoc->stream_locked_on = srcv->sinfo_stream;
12709                                 sp->sender_all_done = 0;
12710                         }
12711                         sctp_snd_sb_alloc(stcb, sp->length);
12712                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12713                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12714                                 sp->strseq = strm->next_sequence_sent;
12715                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12716                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12717                                             (uintptr_t) stcb, sp->length,
12718                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12719                                 }
12720                                 strm->next_sequence_sent++;
12721                         } else {
12722                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12723                         }
12724                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12725                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12726                         SCTP_TCB_SEND_UNLOCK(stcb);
12727                 } else {
12728                         SCTP_TCB_SEND_LOCK(stcb);
12729                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12730                         SCTP_TCB_SEND_UNLOCK(stcb);
12731                         if (sp == NULL) {
12732                                 /* ???? Huh ??? last msg is gone */
12733 #ifdef INVARIANTS
12734                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12735 #else
12736                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12737                                 strm->last_msg_incomplete = 0;
12738 #endif
12739                                 goto do_a_copy_in;
12740
12741                         }
12742                 }
12743                 while (uio->uio_resid > 0) {
12744                         /* How much room do we have? */
12745                         struct mbuf *new_tail, *mm;
12746
12747                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12748                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12749                         else
12750                                 max_len = 0;
12751
12752                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12753                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12754                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12755                                 sndout = 0;
12756                                 new_tail = NULL;
12757                                 if (hold_tcblock) {
12758                                         SCTP_TCB_UNLOCK(stcb);
12759                                         hold_tcblock = 0;
12760                                 }
12761                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12762                                 if ((mm == NULL) || error) {
12763                                         if (mm) {
12764                                                 sctp_m_freem(mm);
12765                                         }
12766                                         goto out;
12767                                 }
12768                                 /* Update the mbuf and count */
12769                                 SCTP_TCB_SEND_LOCK(stcb);
12770                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12771                                         /*
12772                                          * we need to get out. Peer probably
12773                                          * aborted.
12774                                          */
12775                                         sctp_m_freem(mm);
12776                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12777                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12778                                                 error = ECONNRESET;
12779                                         }
12780                                         SCTP_TCB_SEND_UNLOCK(stcb);
12781                                         goto out;
12782                                 }
12783                                 if (sp->tail_mbuf) {
12784                                         /* tack it to the end */
12785                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12786                                         sp->tail_mbuf = new_tail;
12787                                 } else {
12788                                         /* A stolen mbuf */
12789                                         sp->data = mm;
12790                                         sp->tail_mbuf = new_tail;
12791                                 }
12792                                 sctp_snd_sb_alloc(stcb, sndout);
12793                                 atomic_add_int(&sp->length, sndout);
12794                                 len += sndout;
12795
12796                                 /* Did we reach EOR? */
12797                                 if ((uio->uio_resid == 0) &&
12798                                     ((user_marks_eor == 0) ||
12799                                     (srcv->sinfo_flags & SCTP_EOF) ||
12800                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12801                                         sp->msg_is_complete = 1;
12802                                 } else {
12803                                         sp->msg_is_complete = 0;
12804                                 }
12805                                 SCTP_TCB_SEND_UNLOCK(stcb);
12806                         }
12807                         if (uio->uio_resid == 0) {
12808                                 /* got it all? */
12809                                 continue;
12810                         }
12811                         /* PR-SCTP? */
12812                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12813                                 /*
12814                                  * This is ugly but we must assure locking
12815                                  * order
12816                                  */
12817                                 if (hold_tcblock == 0) {
12818                                         SCTP_TCB_LOCK(stcb);
12819                                         hold_tcblock = 1;
12820                                 }
12821                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12822                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12823                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12824                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12825                                 else
12826                                         max_len = 0;
12827                                 if (max_len > 0) {
12828                                         continue;
12829                                 }
12830                                 SCTP_TCB_UNLOCK(stcb);
12831                                 hold_tcblock = 0;
12832                         }
12833                         /* wait for space now */
12834                         if (non_blocking) {
12835                                 /* Non-blocking io in place out */
12836                                 goto skip_out_eof;
12837                         }
12838                         /* What about the INIT, send it maybe */
12839                         if (queue_only_for_init) {
12840                                 if (hold_tcblock == 0) {
12841                                         SCTP_TCB_LOCK(stcb);
12842                                         hold_tcblock = 1;
12843                                 }
12844                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12845                                         /* a collision took us forward? */
12846                                         queue_only = 0;
12847                                 } else {
12848                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12849                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12850                                         queue_only = 1;
12851                                 }
12852                         }
12853                         if ((net->flight_size > net->cwnd) &&
12854                             (asoc->sctp_cmt_on_off == 0)) {
12855                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12856                                 queue_only = 1;
12857                         } else if (asoc->ifp_had_enobuf) {
12858                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12859                                 if (net->flight_size > (2 * net->mtu)) {
12860                                         queue_only = 1;
12861                                 }
12862                                 asoc->ifp_had_enobuf = 0;
12863                         }
12864                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12865                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12866                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12867                             (stcb->asoc.total_flight > 0) &&
12868                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12869                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12870
12871                                 /*-
12872                                  * Ok, Nagle is set on and we have data outstanding.
12873                                  * Don't send anything and let SACKs drive out the
12874                                  * data unless wen have a "full" segment to send.
12875                                  */
12876                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12877                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12878                                 }
12879                                 SCTP_STAT_INCR(sctps_naglequeued);
12880                                 nagle_applies = 1;
12881                         } else {
12882                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12883                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12884                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12885                                 }
12886                                 SCTP_STAT_INCR(sctps_naglesent);
12887                                 nagle_applies = 0;
12888                         }
12889                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12890
12891                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12892                                     nagle_applies, un_sent);
12893                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12894                                     stcb->asoc.total_flight,
12895                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12896                         }
12897                         if (queue_only_for_init)
12898                                 queue_only_for_init = 0;
12899                         if ((queue_only == 0) && (nagle_applies == 0)) {
12900                                 /*-
12901                                  * need to start chunk output
12902                                  * before blocking.. note that if
12903                                  * a lock is already applied, then
12904                                  * the input via the net is happening
12905                                  * and I don't need to start output :-D
12906                                  */
12907                                 if (hold_tcblock == 0) {
12908                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12909                                                 hold_tcblock = 1;
12910                                                 sctp_chunk_output(inp,
12911                                                     stcb,
12912                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12913                                         }
12914                                 } else {
12915                                         sctp_chunk_output(inp,
12916                                             stcb,
12917                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12918                                 }
12919                                 if (hold_tcblock == 1) {
12920                                         SCTP_TCB_UNLOCK(stcb);
12921                                         hold_tcblock = 0;
12922                                 }
12923                         }
12924                         SOCKBUF_LOCK(&so->so_snd);
12925                         /*-
12926                          * This is a bit strange, but I think it will
12927                          * work. The total_output_queue_size is locked and
12928                          * protected by the TCB_LOCK, which we just released.
12929                          * There is a race that can occur between releasing it
12930                          * above, and me getting the socket lock, where sacks
12931                          * come in but we have not put the SB_WAIT on the
12932                          * so_snd buffer to get the wakeup. After the LOCK
12933                          * is applied the sack_processing will also need to
12934                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12935                          * once we have the socket buffer lock if we recheck the
12936                          * size we KNOW we will get to sleep safely with the
12937                          * wakeup flag in place.
12938                          */
12939                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12940                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12941                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12942                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12943                                             so, asoc, uio->uio_resid);
12944                                 }
12945                                 be.error = 0;
12946                                 stcb->block_entry = &be;
12947                                 error = sbwait(&so->so_snd);
12948                                 stcb->block_entry = NULL;
12949
12950                                 if (error || so->so_error || be.error) {
12951                                         if (error == 0) {
12952                                                 if (so->so_error)
12953                                                         error = so->so_error;
12954                                                 if (be.error) {
12955                                                         error = be.error;
12956                                                 }
12957                                         }
12958                                         SOCKBUF_UNLOCK(&so->so_snd);
12959                                         goto out_unlocked;
12960                                 }
12961                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12962                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12963                                             so, asoc, stcb->asoc.total_output_queue_size);
12964                                 }
12965                         }
12966                         SOCKBUF_UNLOCK(&so->so_snd);
12967                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12968                                 goto out_unlocked;
12969                         }
12970                 }
12971                 SCTP_TCB_SEND_LOCK(stcb);
12972                 if (sp) {
12973                         if (sp->msg_is_complete == 0) {
12974                                 strm->last_msg_incomplete = 1;
12975                                 asoc->stream_locked = 1;
12976                                 asoc->stream_locked_on = srcv->sinfo_stream;
12977                         } else {
12978                                 sp->sender_all_done = 1;
12979                                 strm->last_msg_incomplete = 0;
12980                                 asoc->stream_locked = 0;
12981                         }
12982                 } else {
12983                         SCTP_PRINTF("Huh no sp TSNH?\n");
12984                         strm->last_msg_incomplete = 0;
12985                         asoc->stream_locked = 0;
12986                 }
12987                 SCTP_TCB_SEND_UNLOCK(stcb);
12988                 if (uio->uio_resid == 0) {
12989                         got_all_of_the_send = 1;
12990                 }
12991         } else {
12992                 /* We send in a 0, since we do NOT have any locks */
12993                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12994                 top = NULL;
12995                 if (srcv->sinfo_flags & SCTP_EOF) {
12996                         /*
12997                          * This should only happen for Panda for the mbuf
12998                          * send case, which does NOT yet support EEOR mode.
12999                          * Thus, we can just set this flag to do the proper
13000                          * EOF handling.
13001                          */
13002                         got_all_of_the_send = 1;
13003                 }
13004         }
13005         if (error) {
13006                 goto out;
13007         }
13008 dataless_eof:
13009         /* EOF thing ? */
13010         if ((srcv->sinfo_flags & SCTP_EOF) &&
13011             (got_all_of_the_send == 1) &&
13012             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13013                 int cnt;
13014
13015                 SCTP_STAT_INCR(sctps_sends_with_eof);
13016                 error = 0;
13017                 if (hold_tcblock == 0) {
13018                         SCTP_TCB_LOCK(stcb);
13019                         hold_tcblock = 1;
13020                 }
13021                 cnt = sctp_is_there_unsent_data(stcb);
13022                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13023                     TAILQ_EMPTY(&asoc->sent_queue) &&
13024                     (cnt == 0)) {
13025                         if (asoc->locked_on_sending) {
13026                                 goto abort_anyway;
13027                         }
13028                         /* there is nothing queued to send, so I'm done... */
13029                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13030                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13031                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13032                                 /* only send SHUTDOWN the first time through */
13033                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13034                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13035                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13036                                 }
13037                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13038                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13039                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13040                                     asoc->primary_destination);
13041                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13042                                     asoc->primary_destination);
13043                         }
13044                 } else {
13045                         /*-
13046                          * we still got (or just got) data to send, so set
13047                          * SHUTDOWN_PENDING
13048                          */
13049                         /*-
13050                          * XXX sockets draft says that SCTP_EOF should be
13051                          * sent with no data.  currently, we will allow user
13052                          * data to be sent first and move to
13053                          * SHUTDOWN-PENDING
13054                          */
13055                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13056                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13057                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13058                                 if (hold_tcblock == 0) {
13059                                         SCTP_TCB_LOCK(stcb);
13060                                         hold_tcblock = 1;
13061                                 }
13062                                 if (asoc->locked_on_sending) {
13063                                         /* Locked to send out the data */
13064                                         struct sctp_stream_queue_pending *sp;
13065
13066                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13067                                         if (sp) {
13068                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13069                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13070                                         }
13071                                 }
13072                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13073                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13074                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13075                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13076                         abort_anyway:
13077                                         if (free_cnt_applied) {
13078                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13079                                                 free_cnt_applied = 0;
13080                                         }
13081                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13082                                             SCTP_RESPONSE_TO_USER_REQ,
13083                                             NULL, SCTP_SO_LOCKED);
13084                                         /*
13085                                          * now relock the stcb so everything
13086                                          * is sane
13087                                          */
13088                                         hold_tcblock = 0;
13089                                         stcb = NULL;
13090                                         goto out;
13091                                 }
13092                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13093                                     asoc->primary_destination);
13094                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13095                         }
13096                 }
13097         }
13098 skip_out_eof:
13099         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13100                 some_on_control = 1;
13101         }
13102         if (queue_only_for_init) {
13103                 if (hold_tcblock == 0) {
13104                         SCTP_TCB_LOCK(stcb);
13105                         hold_tcblock = 1;
13106                 }
13107                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13108                         /* a collision took us forward? */
13109                         queue_only = 0;
13110                 } else {
13111                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13112                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13113                         queue_only = 1;
13114                 }
13115         }
13116         if ((net->flight_size > net->cwnd) &&
13117             (stcb->asoc.sctp_cmt_on_off == 0)) {
13118                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13119                 queue_only = 1;
13120         } else if (asoc->ifp_had_enobuf) {
13121                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13122                 if (net->flight_size > (2 * net->mtu)) {
13123                         queue_only = 1;
13124                 }
13125                 asoc->ifp_had_enobuf = 0;
13126         }
13127         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13128             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13129         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13130             (stcb->asoc.total_flight > 0) &&
13131             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13132             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13133                 /*-
13134                  * Ok, Nagle is set on and we have data outstanding.
13135                  * Don't send anything and let SACKs drive out the
13136                  * data unless wen have a "full" segment to send.
13137                  */
13138                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13139                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13140                 }
13141                 SCTP_STAT_INCR(sctps_naglequeued);
13142                 nagle_applies = 1;
13143         } else {
13144                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13145                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13146                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13147                 }
13148                 SCTP_STAT_INCR(sctps_naglesent);
13149                 nagle_applies = 0;
13150         }
13151         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13152                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13153                     nagle_applies, un_sent);
13154                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13155                     stcb->asoc.total_flight,
13156                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13157         }
13158         if (queue_only_for_init)
13159                 queue_only_for_init = 0;
13160         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13161                 /* we can attempt to send too. */
13162                 if (hold_tcblock == 0) {
13163                         /*
13164                          * If there is activity recv'ing sacks no need to
13165                          * send
13166                          */
13167                         if (SCTP_TCB_TRYLOCK(stcb)) {
13168                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13169                                 hold_tcblock = 1;
13170                         }
13171                 } else {
13172                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13173                 }
13174         } else if ((queue_only == 0) &&
13175                     (stcb->asoc.peers_rwnd == 0) &&
13176             (stcb->asoc.total_flight == 0)) {
13177                 /* We get to have a probe outstanding */
13178                 if (hold_tcblock == 0) {
13179                         hold_tcblock = 1;
13180                         SCTP_TCB_LOCK(stcb);
13181                 }
13182                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13183         } else if (some_on_control) {
13184                 int num_out, reason, frag_point;
13185
13186                 /* Here we do control only */
13187                 if (hold_tcblock == 0) {
13188                         hold_tcblock = 1;
13189                         SCTP_TCB_LOCK(stcb);
13190                 }
13191                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13192                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13193                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13194         }
13195         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13196             queue_only, stcb->asoc.peers_rwnd, un_sent,
13197             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13198             stcb->asoc.total_output_queue_size, error);
13199
13200 out:
13201 out_unlocked:
13202
13203         if (local_soresv && stcb) {
13204                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13205                 local_soresv = 0;
13206         }
13207         if (create_lock_applied) {
13208                 SCTP_ASOC_CREATE_UNLOCK(inp);
13209                 create_lock_applied = 0;
13210         }
13211         if ((stcb) && hold_tcblock) {
13212                 SCTP_TCB_UNLOCK(stcb);
13213         }
13214         if (stcb && free_cnt_applied) {
13215                 atomic_add_int(&stcb->asoc.refcnt, -1);
13216         }
13217 #ifdef INVARIANTS
13218         if (stcb) {
13219                 if (mtx_owned(&stcb->tcb_mtx)) {
13220                         panic("Leaving with tcb mtx owned?");
13221                 }
13222                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13223                         panic("Leaving with tcb send mtx owned?");
13224                 }
13225         }
13226 #endif
13227 #ifdef INVARIANTS
13228         if (inp) {
13229                 sctp_validate_no_locks(inp);
13230         } else {
13231                 printf("Warning - inp is NULL so cant validate locks\n");
13232         }
13233 #endif
13234         if (top) {
13235                 sctp_m_freem(top);
13236         }
13237         if (control) {
13238                 sctp_m_freem(control);
13239         }
13240         return (error);
13241 }
13242
13243
13244 /*
13245  * generate an AUTHentication chunk, if required
13246  */
13247 struct mbuf *
13248 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13249     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13250     struct sctp_tcb *stcb, uint8_t chunk)
13251 {
13252         struct mbuf *m_auth;
13253         struct sctp_auth_chunk *auth;
13254         int chunk_len;
13255
13256         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13257             (stcb == NULL))
13258                 return (m);
13259
13260         /* sysctl disabled auth? */
13261         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13262                 return (m);
13263
13264         /* peer doesn't do auth... */
13265         if (!stcb->asoc.peer_supports_auth) {
13266                 return (m);
13267         }
13268         /* does the requested chunk require auth? */
13269         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13270                 return (m);
13271         }
13272         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13273         if (m_auth == NULL) {
13274                 /* no mbuf's */
13275                 return (m);
13276         }
13277         /* reserve some space if this will be the first mbuf */
13278         if (m == NULL)
13279                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13280         /* fill in the AUTH chunk details */
13281         auth = mtod(m_auth, struct sctp_auth_chunk *);
13282         bzero(auth, sizeof(*auth));
13283         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13284         auth->ch.chunk_flags = 0;
13285         chunk_len = sizeof(*auth) +
13286             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13287         auth->ch.chunk_length = htons(chunk_len);
13288         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13289         /* key id and hmac digest will be computed and filled in upon send */
13290
13291         /* save the offset where the auth was inserted into the chain */
13292         if (m != NULL) {
13293                 struct mbuf *cn;
13294
13295                 *offset = 0;
13296                 cn = m;
13297                 while (cn) {
13298                         *offset += SCTP_BUF_LEN(cn);
13299                         cn = SCTP_BUF_NEXT(cn);
13300                 }
13301         } else
13302                 *offset = 0;
13303
13304         /* update length and return pointer to the auth chunk */
13305         SCTP_BUF_LEN(m_auth) = chunk_len;
13306         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13307         if (auth_ret != NULL)
13308                 *auth_ret = auth;
13309
13310         return (m);
13311 }
13312
13313 #ifdef INET6
13314 int
13315 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13316 {
13317         struct nd_prefix *pfx = NULL;
13318         struct nd_pfxrouter *pfxrtr = NULL;
13319         struct sockaddr_in6 gw6;
13320
13321         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13322                 return (0);
13323
13324         /* get prefix entry of address */
13325         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13326                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13327                         continue;
13328                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13329                     &src6->sin6_addr, &pfx->ndpr_mask))
13330                         break;
13331         }
13332         /* no prefix entry in the prefix list */
13333         if (pfx == NULL) {
13334                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13335                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13336                 return (0);
13337         }
13338         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13339         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13340
13341         /* search installed gateway from prefix entry */
13342         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13343             pfxrtr->pfr_next) {
13344                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13345                 gw6.sin6_family = AF_INET6;
13346                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13347                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13348                     sizeof(struct in6_addr));
13349                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13350                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13351                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13352                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13353                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13354                     ro->ro_rt->rt_gateway)) {
13355                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13356                         return (1);
13357                 }
13358         }
13359         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13360         return (0);
13361 }
13362
13363 #endif
13364
13365 int
13366 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13367 {
13368         struct sockaddr_in *sin, *mask;
13369         struct ifaddr *ifa;
13370         struct in_addr srcnetaddr, gwnetaddr;
13371
13372         if (ro == NULL || ro->ro_rt == NULL ||
13373             sifa->address.sa.sa_family != AF_INET) {
13374                 return (0);
13375         }
13376         ifa = (struct ifaddr *)sifa->ifa;
13377         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13378         sin = (struct sockaddr_in *)&sifa->address.sin;
13379         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13380         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13381         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13382         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13383
13384         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13385         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13386         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13387         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13388         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13389         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13390                 return (1);
13391         }
13392         return (0);
13393 }