sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <machine/in_cksum.h>
  55
  56
  57
  58 #define SCTP_MAX_GAPS_INARRAY 4
  59 struct sack_track {
  60         uint8_t right_edge;     /* mergable on the right edge */
  61         uint8_t left_edge;      /* mergable on the left edge */
  62         uint8_t num_entries;
  63         uint8_t spare;
  64         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  65 };
  66
  67 struct sack_track sack_array[256] = {
  68         {0, 0, 0, 0,            /* 0x00 */
  69                 {{0, 0},
  70                 {0, 0},
  71                 {0, 0},
  72                 {0, 0}
  73                 }
  74         },
  75         {1, 0, 1, 0,            /* 0x01 */
  76                 {{0, 0},
  77                 {0, 0},
  78                 {0, 0},
  79                 {0, 0}
  80                 }
  81         },
  82         {0, 0, 1, 0,            /* 0x02 */
  83                 {{1, 1},
  84                 {0, 0},
  85                 {0, 0},
  86                 {0, 0}
  87                 }
  88         },
  89         {1, 0, 1, 0,            /* 0x03 */
  90                 {{0, 1},
  91                 {0, 0},
  92                 {0, 0},
  93                 {0, 0}
  94                 }
  95         },
  96         {0, 0, 1, 0,            /* 0x04 */
  97                 {{2, 2},
  98                 {0, 0},
  99                 {0, 0},
 100                 {0, 0}
 101                 }
 102         },
 103         {1, 0, 2, 0,            /* 0x05 */
 104                 {{0, 0},
 105                 {2, 2},
 106                 {0, 0},
 107                 {0, 0}
 108                 }
 109         },
 110         {0, 0, 1, 0,            /* 0x06 */
 111                 {{1, 2},
 112                 {0, 0},
 113                 {0, 0},
 114                 {0, 0}
 115                 }
 116         },
 117         {1, 0, 1, 0,            /* 0x07 */
 118                 {{0, 2},
 119                 {0, 0},
 120                 {0, 0},
 121                 {0, 0}
 122                 }
 123         },
 124         {0, 0, 1, 0,            /* 0x08 */
 125                 {{3, 3},
 126                 {0, 0},
 127                 {0, 0},
 128                 {0, 0}
 129                 }
 130         },
 131         {1, 0, 2, 0,            /* 0x09 */
 132                 {{0, 0},
 133                 {3, 3},
 134                 {0, 0},
 135                 {0, 0}
 136                 }
 137         },
 138         {0, 0, 2, 0,            /* 0x0a */
 139                 {{1, 1},
 140                 {3, 3},
 141                 {0, 0},
 142                 {0, 0}
 143                 }
 144         },
 145         {1, 0, 2, 0,            /* 0x0b */
 146                 {{0, 1},
 147                 {3, 3},
 148                 {0, 0},
 149                 {0, 0}
 150                 }
 151         },
 152         {0, 0, 1, 0,            /* 0x0c */
 153                 {{2, 3},
 154                 {0, 0},
 155                 {0, 0},
 156                 {0, 0}
 157                 }
 158         },
 159         {1, 0, 2, 0,            /* 0x0d */
 160                 {{0, 0},
 161                 {2, 3},
 162                 {0, 0},
 163                 {0, 0}
 164                 }
 165         },
 166         {0, 0, 1, 0,            /* 0x0e */
 167                 {{1, 3},
 168                 {0, 0},
 169                 {0, 0},
 170                 {0, 0}
 171                 }
 172         },
 173         {1, 0, 1, 0,            /* 0x0f */
 174                 {{0, 3},
 175                 {0, 0},
 176                 {0, 0},
 177                 {0, 0}
 178                 }
 179         },
 180         {0, 0, 1, 0,            /* 0x10 */
 181                 {{4, 4},
 182                 {0, 0},
 183                 {0, 0},
 184                 {0, 0}
 185                 }
 186         },
 187         {1, 0, 2, 0,            /* 0x11 */
 188                 {{0, 0},
 189                 {4, 4},
 190                 {0, 0},
 191                 {0, 0}
 192                 }
 193         },
 194         {0, 0, 2, 0,            /* 0x12 */
 195                 {{1, 1},
 196                 {4, 4},
 197                 {0, 0},
 198                 {0, 0}
 199                 }
 200         },
 201         {1, 0, 2, 0,            /* 0x13 */
 202                 {{0, 1},
 203                 {4, 4},
 204                 {0, 0},
 205                 {0, 0}
 206                 }
 207         },
 208         {0, 0, 2, 0,            /* 0x14 */
 209                 {{2, 2},
 210                 {4, 4},
 211                 {0, 0},
 212                 {0, 0}
 213                 }
 214         },
 215         {1, 0, 3, 0,            /* 0x15 */
 216                 {{0, 0},
 217                 {2, 2},
 218                 {4, 4},
 219                 {0, 0}
 220                 }
 221         },
 222         {0, 0, 2, 0,            /* 0x16 */
 223                 {{1, 2},
 224                 {4, 4},
 225                 {0, 0},
 226                 {0, 0}
 227                 }
 228         },
 229         {1, 0, 2, 0,            /* 0x17 */
 230                 {{0, 2},
 231                 {4, 4},
 232                 {0, 0},
 233                 {0, 0}
 234                 }
 235         },
 236         {0, 0, 1, 0,            /* 0x18 */
 237                 {{3, 4},
 238                 {0, 0},
 239                 {0, 0},
 240                 {0, 0}
 241                 }
 242         },
 243         {1, 0, 2, 0,            /* 0x19 */
 244                 {{0, 0},
 245                 {3, 4},
 246                 {0, 0},
 247                 {0, 0}
 248                 }
 249         },
 250         {0, 0, 2, 0,            /* 0x1a */
 251                 {{1, 1},
 252                 {3, 4},
 253                 {0, 0},
 254                 {0, 0}
 255                 }
 256         },
 257         {1, 0, 2, 0,            /* 0x1b */
 258                 {{0, 1},
 259                 {3, 4},
 260                 {0, 0},
 261                 {0, 0}
 262                 }
 263         },
 264         {0, 0, 1, 0,            /* 0x1c */
 265                 {{2, 4},
 266                 {0, 0},
 267                 {0, 0},
 268                 {0, 0}
 269                 }
 270         },
 271         {1, 0, 2, 0,            /* 0x1d */
 272                 {{0, 0},
 273                 {2, 4},
 274                 {0, 0},
 275                 {0, 0}
 276                 }
 277         },
 278         {0, 0, 1, 0,            /* 0x1e */
 279                 {{1, 4},
 280                 {0, 0},
 281                 {0, 0},
 282                 {0, 0}
 283                 }
 284         },
 285         {1, 0, 1, 0,            /* 0x1f */
 286                 {{0, 4},
 287                 {0, 0},
 288                 {0, 0},
 289                 {0, 0}
 290                 }
 291         },
 292         {0, 0, 1, 0,            /* 0x20 */
 293                 {{5, 5},
 294                 {0, 0},
 295                 {0, 0},
 296                 {0, 0}
 297                 }
 298         },
 299         {1, 0, 2, 0,            /* 0x21 */
 300                 {{0, 0},
 301                 {5, 5},
 302                 {0, 0},
 303                 {0, 0}
 304                 }
 305         },
 306         {0, 0, 2, 0,            /* 0x22 */
 307                 {{1, 1},
 308                 {5, 5},
 309                 {0, 0},
 310                 {0, 0}
 311                 }
 312         },
 313         {1, 0, 2, 0,            /* 0x23 */
 314                 {{0, 1},
 315                 {5, 5},
 316                 {0, 0},
 317                 {0, 0}
 318                 }
 319         },
 320         {0, 0, 2, 0,            /* 0x24 */
 321                 {{2, 2},
 322                 {5, 5},
 323                 {0, 0},
 324                 {0, 0}
 325                 }
 326         },
 327         {1, 0, 3, 0,            /* 0x25 */
 328                 {{0, 0},
 329                 {2, 2},
 330                 {5, 5},
 331                 {0, 0}
 332                 }
 333         },
 334         {0, 0, 2, 0,            /* 0x26 */
 335                 {{1, 2},
 336                 {5, 5},
 337                 {0, 0},
 338                 {0, 0}
 339                 }
 340         },
 341         {1, 0, 2, 0,            /* 0x27 */
 342                 {{0, 2},
 343                 {5, 5},
 344                 {0, 0},
 345                 {0, 0}
 346                 }
 347         },
 348         {0, 0, 2, 0,            /* 0x28 */
 349                 {{3, 3},
 350                 {5, 5},
 351                 {0, 0},
 352                 {0, 0}
 353                 }
 354         },
 355         {1, 0, 3, 0,            /* 0x29 */
 356                 {{0, 0},
 357                 {3, 3},
 358                 {5, 5},
 359                 {0, 0}
 360                 }
 361         },
 362         {0, 0, 3, 0,            /* 0x2a */
 363                 {{1, 1},
 364                 {3, 3},
 365                 {5, 5},
 366                 {0, 0}
 367                 }
 368         },
 369         {1, 0, 3, 0,            /* 0x2b */
 370                 {{0, 1},
 371                 {3, 3},
 372                 {5, 5},
 373                 {0, 0}
 374                 }
 375         },
 376         {0, 0, 2, 0,            /* 0x2c */
 377                 {{2, 3},
 378                 {5, 5},
 379                 {0, 0},
 380                 {0, 0}
 381                 }
 382         },
 383         {1, 0, 3, 0,            /* 0x2d */
 384                 {{0, 0},
 385                 {2, 3},
 386                 {5, 5},
 387                 {0, 0}
 388                 }
 389         },
 390         {0, 0, 2, 0,            /* 0x2e */
 391                 {{1, 3},
 392                 {5, 5},
 393                 {0, 0},
 394                 {0, 0}
 395                 }
 396         },
 397         {1, 0, 2, 0,            /* 0x2f */
 398                 {{0, 3},
 399                 {5, 5},
 400                 {0, 0},
 401                 {0, 0}
 402                 }
 403         },
 404         {0, 0, 1, 0,            /* 0x30 */
 405                 {{4, 5},
 406                 {0, 0},
 407                 {0, 0},
 408                 {0, 0}
 409                 }
 410         },
 411         {1, 0, 2, 0,            /* 0x31 */
 412                 {{0, 0},
 413                 {4, 5},
 414                 {0, 0},
 415                 {0, 0}
 416                 }
 417         },
 418         {0, 0, 2, 0,            /* 0x32 */
 419                 {{1, 1},
 420                 {4, 5},
 421                 {0, 0},
 422                 {0, 0}
 423                 }
 424         },
 425         {1, 0, 2, 0,            /* 0x33 */
 426                 {{0, 1},
 427                 {4, 5},
 428                 {0, 0},
 429                 {0, 0}
 430                 }
 431         },
 432         {0, 0, 2, 0,            /* 0x34 */
 433                 {{2, 2},
 434                 {4, 5},
 435                 {0, 0},
 436                 {0, 0}
 437                 }
 438         },
 439         {1, 0, 3, 0,            /* 0x35 */
 440                 {{0, 0},
 441                 {2, 2},
 442                 {4, 5},
 443                 {0, 0}
 444                 }
 445         },
 446         {0, 0, 2, 0,            /* 0x36 */
 447                 {{1, 2},
 448                 {4, 5},
 449                 {0, 0},
 450                 {0, 0}
 451                 }
 452         },
 453         {1, 0, 2, 0,            /* 0x37 */
 454                 {{0, 2},
 455                 {4, 5},
 456                 {0, 0},
 457                 {0, 0}
 458                 }
 459         },
 460         {0, 0, 1, 0,            /* 0x38 */
 461                 {{3, 5},
 462                 {0, 0},
 463                 {0, 0},
 464                 {0, 0}
 465                 }
 466         },
 467         {1, 0, 2, 0,            /* 0x39 */
 468                 {{0, 0},
 469                 {3, 5},
 470                 {0, 0},
 471                 {0, 0}
 472                 }
 473         },
 474         {0, 0, 2, 0,            /* 0x3a */
 475                 {{1, 1},
 476                 {3, 5},
 477                 {0, 0},
 478                 {0, 0}
 479                 }
 480         },
 481         {1, 0, 2, 0,            /* 0x3b */
 482                 {{0, 1},
 483                 {3, 5},
 484                 {0, 0},
 485                 {0, 0}
 486                 }
 487         },
 488         {0, 0, 1, 0,            /* 0x3c */
 489                 {{2, 5},
 490                 {0, 0},
 491                 {0, 0},
 492                 {0, 0}
 493                 }
 494         },
 495         {1, 0, 2, 0,            /* 0x3d */
 496                 {{0, 0},
 497                 {2, 5},
 498                 {0, 0},
 499                 {0, 0}
 500                 }
 501         },
 502         {0, 0, 1, 0,            /* 0x3e */
 503                 {{1, 5},
 504                 {0, 0},
 505                 {0, 0},
 506                 {0, 0}
 507                 }
 508         },
 509         {1, 0, 1, 0,            /* 0x3f */
 510                 {{0, 5},
 511                 {0, 0},
 512                 {0, 0},
 513                 {0, 0}
 514                 }
 515         },
 516         {0, 0, 1, 0,            /* 0x40 */
 517                 {{6, 6},
 518                 {0, 0},
 519                 {0, 0},
 520                 {0, 0}
 521                 }
 522         },
 523         {1, 0, 2, 0,            /* 0x41 */
 524                 {{0, 0},
 525                 {6, 6},
 526                 {0, 0},
 527                 {0, 0}
 528                 }
 529         },
 530         {0, 0, 2, 0,            /* 0x42 */
 531                 {{1, 1},
 532                 {6, 6},
 533                 {0, 0},
 534                 {0, 0}
 535                 }
 536         },
 537         {1, 0, 2, 0,            /* 0x43 */
 538                 {{0, 1},
 539                 {6, 6},
 540                 {0, 0},
 541                 {0, 0}
 542                 }
 543         },
 544         {0, 0, 2, 0,            /* 0x44 */
 545                 {{2, 2},
 546                 {6, 6},
 547                 {0, 0},
 548                 {0, 0}
 549                 }
 550         },
 551         {1, 0, 3, 0,            /* 0x45 */
 552                 {{0, 0},
 553                 {2, 2},
 554                 {6, 6},
 555                 {0, 0}
 556                 }
 557         },
 558         {0, 0, 2, 0,            /* 0x46 */
 559                 {{1, 2},
 560                 {6, 6},
 561                 {0, 0},
 562                 {0, 0}
 563                 }
 564         },
 565         {1, 0, 2, 0,            /* 0x47 */
 566                 {{0, 2},
 567                 {6, 6},
 568                 {0, 0},
 569                 {0, 0}
 570                 }
 571         },
 572         {0, 0, 2, 0,            /* 0x48 */
 573                 {{3, 3},
 574                 {6, 6},
 575                 {0, 0},
 576                 {0, 0}
 577                 }
 578         },
 579         {1, 0, 3, 0,            /* 0x49 */
 580                 {{0, 0},
 581                 {3, 3},
 582                 {6, 6},
 583                 {0, 0}
 584                 }
 585         },
 586         {0, 0, 3, 0,            /* 0x4a */
 587                 {{1, 1},
 588                 {3, 3},
 589                 {6, 6},
 590                 {0, 0}
 591                 }
 592         },
 593         {1, 0, 3, 0,            /* 0x4b */
 594                 {{0, 1},
 595                 {3, 3},
 596                 {6, 6},
 597                 {0, 0}
 598                 }
 599         },
 600         {0, 0, 2, 0,            /* 0x4c */
 601                 {{2, 3},
 602                 {6, 6},
 603                 {0, 0},
 604                 {0, 0}
 605                 }
 606         },
 607         {1, 0, 3, 0,            /* 0x4d */
 608                 {{0, 0},
 609                 {2, 3},
 610                 {6, 6},
 611                 {0, 0}
 612                 }
 613         },
 614         {0, 0, 2, 0,            /* 0x4e */
 615                 {{1, 3},
 616                 {6, 6},
 617                 {0, 0},
 618                 {0, 0}
 619                 }
 620         },
 621         {1, 0, 2, 0,            /* 0x4f */
 622                 {{0, 3},
 623                 {6, 6},
 624                 {0, 0},
 625                 {0, 0}
 626                 }
 627         },
 628         {0, 0, 2, 0,            /* 0x50 */
 629                 {{4, 4},
 630                 {6, 6},
 631                 {0, 0},
 632                 {0, 0}
 633                 }
 634         },
 635         {1, 0, 3, 0,            /* 0x51 */
 636                 {{0, 0},
 637                 {4, 4},
 638                 {6, 6},
 639                 {0, 0}
 640                 }
 641         },
 642         {0, 0, 3, 0,            /* 0x52 */
 643                 {{1, 1},
 644                 {4, 4},
 645                 {6, 6},
 646                 {0, 0}
 647                 }
 648         },
 649         {1, 0, 3, 0,            /* 0x53 */
 650                 {{0, 1},
 651                 {4, 4},
 652                 {6, 6},
 653                 {0, 0}
 654                 }
 655         },
 656         {0, 0, 3, 0,            /* 0x54 */
 657                 {{2, 2},
 658                 {4, 4},
 659                 {6, 6},
 660                 {0, 0}
 661                 }
 662         },
 663         {1, 0, 4, 0,            /* 0x55 */
 664                 {{0, 0},
 665                 {2, 2},
 666                 {4, 4},
 667                 {6, 6}
 668                 }
 669         },
 670         {0, 0, 3, 0,            /* 0x56 */
 671                 {{1, 2},
 672                 {4, 4},
 673                 {6, 6},
 674                 {0, 0}
 675                 }
 676         },
 677         {1, 0, 3, 0,            /* 0x57 */
 678                 {{0, 2},
 679                 {4, 4},
 680                 {6, 6},
 681                 {0, 0}
 682                 }
 683         },
 684         {0, 0, 2, 0,            /* 0x58 */
 685                 {{3, 4},
 686                 {6, 6},
 687                 {0, 0},
 688                 {0, 0}
 689                 }
 690         },
 691         {1, 0, 3, 0,            /* 0x59 */
 692                 {{0, 0},
 693                 {3, 4},
 694                 {6, 6},
 695                 {0, 0}
 696                 }
 697         },
 698         {0, 0, 3, 0,            /* 0x5a */
 699                 {{1, 1},
 700                 {3, 4},
 701                 {6, 6},
 702                 {0, 0}
 703                 }
 704         },
 705         {1, 0, 3, 0,            /* 0x5b */
 706                 {{0, 1},
 707                 {3, 4},
 708                 {6, 6},
 709                 {0, 0}
 710                 }
 711         },
 712         {0, 0, 2, 0,            /* 0x5c */
 713                 {{2, 4},
 714                 {6, 6},
 715                 {0, 0},
 716                 {0, 0}
 717                 }
 718         },
 719         {1, 0, 3, 0,            /* 0x5d */
 720                 {{0, 0},
 721                 {2, 4},
 722                 {6, 6},
 723                 {0, 0}
 724                 }
 725         },
 726         {0, 0, 2, 0,            /* 0x5e */
 727                 {{1, 4},
 728                 {6, 6},
 729                 {0, 0},
 730                 {0, 0}
 731                 }
 732         },
 733         {1, 0, 2, 0,            /* 0x5f */
 734                 {{0, 4},
 735                 {6, 6},
 736                 {0, 0},
 737                 {0, 0}
 738                 }
 739         },
 740         {0, 0, 1, 0,            /* 0x60 */
 741                 {{5, 6},
 742                 {0, 0},
 743                 {0, 0},
 744                 {0, 0}
 745                 }
 746         },
 747         {1, 0, 2, 0,            /* 0x61 */
 748                 {{0, 0},
 749                 {5, 6},
 750                 {0, 0},
 751                 {0, 0}
 752                 }
 753         },
 754         {0, 0, 2, 0,            /* 0x62 */
 755                 {{1, 1},
 756                 {5, 6},
 757                 {0, 0},
 758                 {0, 0}
 759                 }
 760         },
 761         {1, 0, 2, 0,            /* 0x63 */
 762                 {{0, 1},
 763                 {5, 6},
 764                 {0, 0},
 765                 {0, 0}
 766                 }
 767         },
 768         {0, 0, 2, 0,            /* 0x64 */
 769                 {{2, 2},
 770                 {5, 6},
 771                 {0, 0},
 772                 {0, 0}
 773                 }
 774         },
 775         {1, 0, 3, 0,            /* 0x65 */
 776                 {{0, 0},
 777                 {2, 2},
 778                 {5, 6},
 779                 {0, 0}
 780                 }
 781         },
 782         {0, 0, 2, 0,            /* 0x66 */
 783                 {{1, 2},
 784                 {5, 6},
 785                 {0, 0},
 786                 {0, 0}
 787                 }
 788         },
 789         {1, 0, 2, 0,            /* 0x67 */
 790                 {{0, 2},
 791                 {5, 6},
 792                 {0, 0},
 793                 {0, 0}
 794                 }
 795         },
 796         {0, 0, 2, 0,            /* 0x68 */
 797                 {{3, 3},
 798                 {5, 6},
 799                 {0, 0},
 800                 {0, 0}
 801                 }
 802         },
 803         {1, 0, 3, 0,            /* 0x69 */
 804                 {{0, 0},
 805                 {3, 3},
 806                 {5, 6},
 807                 {0, 0}
 808                 }
 809         },
 810         {0, 0, 3, 0,            /* 0x6a */
 811                 {{1, 1},
 812                 {3, 3},
 813                 {5, 6},
 814                 {0, 0}
 815                 }
 816         },
 817         {1, 0, 3, 0,            /* 0x6b */
 818                 {{0, 1},
 819                 {3, 3},
 820                 {5, 6},
 821                 {0, 0}
 822                 }
 823         },
 824         {0, 0, 2, 0,            /* 0x6c */
 825                 {{2, 3},
 826                 {5, 6},
 827                 {0, 0},
 828                 {0, 0}
 829                 }
 830         },
 831         {1, 0, 3, 0,            /* 0x6d */
 832                 {{0, 0},
 833                 {2, 3},
 834                 {5, 6},
 835                 {0, 0}
 836                 }
 837         },
 838         {0, 0, 2, 0,            /* 0x6e */
 839                 {{1, 3},
 840                 {5, 6},
 841                 {0, 0},
 842                 {0, 0}
 843                 }
 844         },
 845         {1, 0, 2, 0,            /* 0x6f */
 846                 {{0, 3},
 847                 {5, 6},
 848                 {0, 0},
 849                 {0, 0}
 850                 }
 851         },
 852         {0, 0, 1, 0,            /* 0x70 */
 853                 {{4, 6},
 854                 {0, 0},
 855                 {0, 0},
 856                 {0, 0}
 857                 }
 858         },
 859         {1, 0, 2, 0,            /* 0x71 */
 860                 {{0, 0},
 861                 {4, 6},
 862                 {0, 0},
 863                 {0, 0}
 864                 }
 865         },
 866         {0, 0, 2, 0,            /* 0x72 */
 867                 {{1, 1},
 868                 {4, 6},
 869                 {0, 0},
 870                 {0, 0}
 871                 }
 872         },
 873         {1, 0, 2, 0,            /* 0x73 */
 874                 {{0, 1},
 875                 {4, 6},
 876                 {0, 0},
 877                 {0, 0}
 878                 }
 879         },
 880         {0, 0, 2, 0,            /* 0x74 */
 881                 {{2, 2},
 882                 {4, 6},
 883                 {0, 0},
 884                 {0, 0}
 885                 }
 886         },
 887         {1, 0, 3, 0,            /* 0x75 */
 888                 {{0, 0},
 889                 {2, 2},
 890                 {4, 6},
 891                 {0, 0}
 892                 }
 893         },
 894         {0, 0, 2, 0,            /* 0x76 */
 895                 {{1, 2},
 896                 {4, 6},
 897                 {0, 0},
 898                 {0, 0}
 899                 }
 900         },
 901         {1, 0, 2, 0,            /* 0x77 */
 902                 {{0, 2},
 903                 {4, 6},
 904                 {0, 0},
 905                 {0, 0}
 906                 }
 907         },
 908         {0, 0, 1, 0,            /* 0x78 */
 909                 {{3, 6},
 910                 {0, 0},
 911                 {0, 0},
 912                 {0, 0}
 913                 }
 914         },
 915         {1, 0, 2, 0,            /* 0x79 */
 916                 {{0, 0},
 917                 {3, 6},
 918                 {0, 0},
 919                 {0, 0}
 920                 }
 921         },
 922         {0, 0, 2, 0,            /* 0x7a */
 923                 {{1, 1},
 924                 {3, 6},
 925                 {0, 0},
 926                 {0, 0}
 927                 }
 928         },
 929         {1, 0, 2, 0,            /* 0x7b */
 930                 {{0, 1},
 931                 {3, 6},
 932                 {0, 0},
 933                 {0, 0}
 934                 }
 935         },
 936         {0, 0, 1, 0,            /* 0x7c */
 937                 {{2, 6},
 938                 {0, 0},
 939                 {0, 0},
 940                 {0, 0}
 941                 }
 942         },
 943         {1, 0, 2, 0,            /* 0x7d */
 944                 {{0, 0},
 945                 {2, 6},
 946                 {0, 0},
 947                 {0, 0}
 948                 }
 949         },
 950         {0, 0, 1, 0,            /* 0x7e */
 951                 {{1, 6},
 952                 {0, 0},
 953                 {0, 0},
 954                 {0, 0}
 955                 }
 956         },
 957         {1, 0, 1, 0,            /* 0x7f */
 958                 {{0, 6},
 959                 {0, 0},
 960                 {0, 0},
 961                 {0, 0}
 962                 }
 963         },
 964         {0, 1, 1, 0,            /* 0x80 */
 965                 {{7, 7},
 966                 {0, 0},
 967                 {0, 0},
 968                 {0, 0}
 969                 }
 970         },
 971         {1, 1, 2, 0,            /* 0x81 */
 972                 {{0, 0},
 973                 {7, 7},
 974                 {0, 0},
 975                 {0, 0}
 976                 }
 977         },
 978         {0, 1, 2, 0,            /* 0x82 */
 979                 {{1, 1},
 980                 {7, 7},
 981                 {0, 0},
 982                 {0, 0}
 983                 }
 984         },
 985         {1, 1, 2, 0,            /* 0x83 */
 986                 {{0, 1},
 987                 {7, 7},
 988                 {0, 0},
 989                 {0, 0}
 990                 }
 991         },
 992         {0, 1, 2, 0,            /* 0x84 */
 993                 {{2, 2},
 994                 {7, 7},
 995                 {0, 0},
 996                 {0, 0}
 997                 }
 998         },
 999         {1, 1, 3, 0,            /* 0x85 */
1000                 {{0, 0},
1001                 {2, 2},
1002                 {7, 7},
1003                 {0, 0}
1004                 }
1005         },
1006         {0, 1, 2, 0,            /* 0x86 */
1007                 {{1, 2},
1008                 {7, 7},
1009                 {0, 0},
1010                 {0, 0}
1011                 }
1012         },
1013         {1, 1, 2, 0,            /* 0x87 */
1014                 {{0, 2},
1015                 {7, 7},
1016                 {0, 0},
1017                 {0, 0}
1018                 }
1019         },
1020         {0, 1, 2, 0,            /* 0x88 */
1021                 {{3, 3},
1022                 {7, 7},
1023                 {0, 0},
1024                 {0, 0}
1025                 }
1026         },
1027         {1, 1, 3, 0,            /* 0x89 */
1028                 {{0, 0},
1029                 {3, 3},
1030                 {7, 7},
1031                 {0, 0}
1032                 }
1033         },
1034         {0, 1, 3, 0,            /* 0x8a */
1035                 {{1, 1},
1036                 {3, 3},
1037                 {7, 7},
1038                 {0, 0}
1039                 }
1040         },
1041         {1, 1, 3, 0,            /* 0x8b */
1042                 {{0, 1},
1043                 {3, 3},
1044                 {7, 7},
1045                 {0, 0}
1046                 }
1047         },
1048         {0, 1, 2, 0,            /* 0x8c */
1049                 {{2, 3},
1050                 {7, 7},
1051                 {0, 0},
1052                 {0, 0}
1053                 }
1054         },
1055         {1, 1, 3, 0,            /* 0x8d */
1056                 {{0, 0},
1057                 {2, 3},
1058                 {7, 7},
1059                 {0, 0}
1060                 }
1061         },
1062         {0, 1, 2, 0,            /* 0x8e */
1063                 {{1, 3},
1064                 {7, 7},
1065                 {0, 0},
1066                 {0, 0}
1067                 }
1068         },
1069         {1, 1, 2, 0,            /* 0x8f */
1070                 {{0, 3},
1071                 {7, 7},
1072                 {0, 0},
1073                 {0, 0}
1074                 }
1075         },
1076         {0, 1, 2, 0,            /* 0x90 */
1077                 {{4, 4},
1078                 {7, 7},
1079                 {0, 0},
1080                 {0, 0}
1081                 }
1082         },
1083         {1, 1, 3, 0,            /* 0x91 */
1084                 {{0, 0},
1085                 {4, 4},
1086                 {7, 7},
1087                 {0, 0}
1088                 }
1089         },
1090         {0, 1, 3, 0,            /* 0x92 */
1091                 {{1, 1},
1092                 {4, 4},
1093                 {7, 7},
1094                 {0, 0}
1095                 }
1096         },
1097         {1, 1, 3, 0,            /* 0x93 */
1098                 {{0, 1},
1099                 {4, 4},
1100                 {7, 7},
1101                 {0, 0}
1102                 }
1103         },
1104         {0, 1, 3, 0,            /* 0x94 */
1105                 {{2, 2},
1106                 {4, 4},
1107                 {7, 7},
1108                 {0, 0}
1109                 }
1110         },
1111         {1, 1, 4, 0,            /* 0x95 */
1112                 {{0, 0},
1113                 {2, 2},
1114                 {4, 4},
1115                 {7, 7}
1116                 }
1117         },
1118         {0, 1, 3, 0,            /* 0x96 */
1119                 {{1, 2},
1120                 {4, 4},
1121                 {7, 7},
1122                 {0, 0}
1123                 }
1124         },
1125         {1, 1, 3, 0,            /* 0x97 */
1126                 {{0, 2},
1127                 {4, 4},
1128                 {7, 7},
1129                 {0, 0}
1130                 }
1131         },
1132         {0, 1, 2, 0,            /* 0x98 */
1133                 {{3, 4},
1134                 {7, 7},
1135                 {0, 0},
1136                 {0, 0}
1137                 }
1138         },
1139         {1, 1, 3, 0,            /* 0x99 */
1140                 {{0, 0},
1141                 {3, 4},
1142                 {7, 7},
1143                 {0, 0}
1144                 }
1145         },
1146         {0, 1, 3, 0,            /* 0x9a */
1147                 {{1, 1},
1148                 {3, 4},
1149                 {7, 7},
1150                 {0, 0}
1151                 }
1152         },
1153         {1, 1, 3, 0,            /* 0x9b */
1154                 {{0, 1},
1155                 {3, 4},
1156                 {7, 7},
1157                 {0, 0}
1158                 }
1159         },
1160         {0, 1, 2, 0,            /* 0x9c */
1161                 {{2, 4},
1162                 {7, 7},
1163                 {0, 0},
1164                 {0, 0}
1165                 }
1166         },
1167         {1, 1, 3, 0,            /* 0x9d */
1168                 {{0, 0},
1169                 {2, 4},
1170                 {7, 7},
1171                 {0, 0}
1172                 }
1173         },
1174         {0, 1, 2, 0,            /* 0x9e */
1175                 {{1, 4},
1176                 {7, 7},
1177                 {0, 0},
1178                 {0, 0}
1179                 }
1180         },
1181         {1, 1, 2, 0,            /* 0x9f */
1182                 {{0, 4},
1183                 {7, 7},
1184                 {0, 0},
1185                 {0, 0}
1186                 }
1187         },
1188         {0, 1, 2, 0,            /* 0xa0 */
1189                 {{5, 5},
1190                 {7, 7},
1191                 {0, 0},
1192                 {0, 0}
1193                 }
1194         },
1195         {1, 1, 3, 0,            /* 0xa1 */
1196                 {{0, 0},
1197                 {5, 5},
1198                 {7, 7},
1199                 {0, 0}
1200                 }
1201         },
1202         {0, 1, 3, 0,            /* 0xa2 */
1203                 {{1, 1},
1204                 {5, 5},
1205                 {7, 7},
1206                 {0, 0}
1207                 }
1208         },
1209         {1, 1, 3, 0,            /* 0xa3 */
1210                 {{0, 1},
1211                 {5, 5},
1212                 {7, 7},
1213                 {0, 0}
1214                 }
1215         },
1216         {0, 1, 3, 0,            /* 0xa4 */
1217                 {{2, 2},
1218                 {5, 5},
1219                 {7, 7},
1220                 {0, 0}
1221                 }
1222         },
1223         {1, 1, 4, 0,            /* 0xa5 */
1224                 {{0, 0},
1225                 {2, 2},
1226                 {5, 5},
1227                 {7, 7}
1228                 }
1229         },
1230         {0, 1, 3, 0,            /* 0xa6 */
1231                 {{1, 2},
1232                 {5, 5},
1233                 {7, 7},
1234                 {0, 0}
1235                 }
1236         },
1237         {1, 1, 3, 0,            /* 0xa7 */
1238                 {{0, 2},
1239                 {5, 5},
1240                 {7, 7},
1241                 {0, 0}
1242                 }
1243         },
1244         {0, 1, 3, 0,            /* 0xa8 */
1245                 {{3, 3},
1246                 {5, 5},
1247                 {7, 7},
1248                 {0, 0}
1249                 }
1250         },
1251         {1, 1, 4, 0,            /* 0xa9 */
1252                 {{0, 0},
1253                 {3, 3},
1254                 {5, 5},
1255                 {7, 7}
1256                 }
1257         },
1258         {0, 1, 4, 0,            /* 0xaa */
1259                 {{1, 1},
1260                 {3, 3},
1261                 {5, 5},
1262                 {7, 7}
1263                 }
1264         },
1265         {1, 1, 4, 0,            /* 0xab */
1266                 {{0, 1},
1267                 {3, 3},
1268                 {5, 5},
1269                 {7, 7}
1270                 }
1271         },
1272         {0, 1, 3, 0,            /* 0xac */
1273                 {{2, 3},
1274                 {5, 5},
1275                 {7, 7},
1276                 {0, 0}
1277                 }
1278         },
1279         {1, 1, 4, 0,            /* 0xad */
1280                 {{0, 0},
1281                 {2, 3},
1282                 {5, 5},
1283                 {7, 7}
1284                 }
1285         },
1286         {0, 1, 3, 0,            /* 0xae */
1287                 {{1, 3},
1288                 {5, 5},
1289                 {7, 7},
1290                 {0, 0}
1291                 }
1292         },
1293         {1, 1, 3, 0,            /* 0xaf */
1294                 {{0, 3},
1295                 {5, 5},
1296                 {7, 7},
1297                 {0, 0}
1298                 }
1299         },
1300         {0, 1, 2, 0,            /* 0xb0 */
1301                 {{4, 5},
1302                 {7, 7},
1303                 {0, 0},
1304                 {0, 0}
1305                 }
1306         },
1307         {1, 1, 3, 0,            /* 0xb1 */
1308                 {{0, 0},
1309                 {4, 5},
1310                 {7, 7},
1311                 {0, 0}
1312                 }
1313         },
1314         {0, 1, 3, 0,            /* 0xb2 */
1315                 {{1, 1},
1316                 {4, 5},
1317                 {7, 7},
1318                 {0, 0}
1319                 }
1320         },
1321         {1, 1, 3, 0,            /* 0xb3 */
1322                 {{0, 1},
1323                 {4, 5},
1324                 {7, 7},
1325                 {0, 0}
1326                 }
1327         },
1328         {0, 1, 3, 0,            /* 0xb4 */
1329                 {{2, 2},
1330                 {4, 5},
1331                 {7, 7},
1332                 {0, 0}
1333                 }
1334         },
1335         {1, 1, 4, 0,            /* 0xb5 */
1336                 {{0, 0},
1337                 {2, 2},
1338                 {4, 5},
1339                 {7, 7}
1340                 }
1341         },
1342         {0, 1, 3, 0,            /* 0xb6 */
1343                 {{1, 2},
1344                 {4, 5},
1345                 {7, 7},
1346                 {0, 0}
1347                 }
1348         },
1349         {1, 1, 3, 0,            /* 0xb7 */
1350                 {{0, 2},
1351                 {4, 5},
1352                 {7, 7},
1353                 {0, 0}
1354                 }
1355         },
1356         {0, 1, 2, 0,            /* 0xb8 */
1357                 {{3, 5},
1358                 {7, 7},
1359                 {0, 0},
1360                 {0, 0}
1361                 }
1362         },
1363         {1, 1, 3, 0,            /* 0xb9 */
1364                 {{0, 0},
1365                 {3, 5},
1366                 {7, 7},
1367                 {0, 0}
1368                 }
1369         },
1370         {0, 1, 3, 0,            /* 0xba */
1371                 {{1, 1},
1372                 {3, 5},
1373                 {7, 7},
1374                 {0, 0}
1375                 }
1376         },
1377         {1, 1, 3, 0,            /* 0xbb */
1378                 {{0, 1},
1379                 {3, 5},
1380                 {7, 7},
1381                 {0, 0}
1382                 }
1383         },
1384         {0, 1, 2, 0,            /* 0xbc */
1385                 {{2, 5},
1386                 {7, 7},
1387                 {0, 0},
1388                 {0, 0}
1389                 }
1390         },
1391         {1, 1, 3, 0,            /* 0xbd */
1392                 {{0, 0},
1393                 {2, 5},
1394                 {7, 7},
1395                 {0, 0}
1396                 }
1397         },
1398         {0, 1, 2, 0,            /* 0xbe */
1399                 {{1, 5},
1400                 {7, 7},
1401                 {0, 0},
1402                 {0, 0}
1403                 }
1404         },
1405         {1, 1, 2, 0,            /* 0xbf */
1406                 {{0, 5},
1407                 {7, 7},
1408                 {0, 0},
1409                 {0, 0}
1410                 }
1411         },
1412         {0, 1, 1, 0,            /* 0xc0 */
1413                 {{6, 7},
1414                 {0, 0},
1415                 {0, 0},
1416                 {0, 0}
1417                 }
1418         },
1419         {1, 1, 2, 0,            /* 0xc1 */
1420                 {{0, 0},
1421                 {6, 7},
1422                 {0, 0},
1423                 {0, 0}
1424                 }
1425         },
1426         {0, 1, 2, 0,            /* 0xc2 */
1427                 {{1, 1},
1428                 {6, 7},
1429                 {0, 0},
1430                 {0, 0}
1431                 }
1432         },
1433         {1, 1, 2, 0,            /* 0xc3 */
1434                 {{0, 1},
1435                 {6, 7},
1436                 {0, 0},
1437                 {0, 0}
1438                 }
1439         },
1440         {0, 1, 2, 0,            /* 0xc4 */
1441                 {{2, 2},
1442                 {6, 7},
1443                 {0, 0},
1444                 {0, 0}
1445                 }
1446         },
1447         {1, 1, 3, 0,            /* 0xc5 */
1448                 {{0, 0},
1449                 {2, 2},
1450                 {6, 7},
1451                 {0, 0}
1452                 }
1453         },
1454         {0, 1, 2, 0,            /* 0xc6 */
1455                 {{1, 2},
1456                 {6, 7},
1457                 {0, 0},
1458                 {0, 0}
1459                 }
1460         },
1461         {1, 1, 2, 0,            /* 0xc7 */
1462                 {{0, 2},
1463                 {6, 7},
1464                 {0, 0},
1465                 {0, 0}
1466                 }
1467         },
1468         {0, 1, 2, 0,            /* 0xc8 */
1469                 {{3, 3},
1470                 {6, 7},
1471                 {0, 0},
1472                 {0, 0}
1473                 }
1474         },
1475         {1, 1, 3, 0,            /* 0xc9 */
1476                 {{0, 0},
1477                 {3, 3},
1478                 {6, 7},
1479                 {0, 0}
1480                 }
1481         },
1482         {0, 1, 3, 0,            /* 0xca */
1483                 {{1, 1},
1484                 {3, 3},
1485                 {6, 7},
1486                 {0, 0}
1487                 }
1488         },
1489         {1, 1, 3, 0,            /* 0xcb */
1490                 {{0, 1},
1491                 {3, 3},
1492                 {6, 7},
1493                 {0, 0}
1494                 }
1495         },
1496         {0, 1, 2, 0,            /* 0xcc */
1497                 {{2, 3},
1498                 {6, 7},
1499                 {0, 0},
1500                 {0, 0}
1501                 }
1502         },
1503         {1, 1, 3, 0,            /* 0xcd */
1504                 {{0, 0},
1505                 {2, 3},
1506                 {6, 7},
1507                 {0, 0}
1508                 }
1509         },
1510         {0, 1, 2, 0,            /* 0xce */
1511                 {{1, 3},
1512                 {6, 7},
1513                 {0, 0},
1514                 {0, 0}
1515                 }
1516         },
1517         {1, 1, 2, 0,            /* 0xcf */
1518                 {{0, 3},
1519                 {6, 7},
1520                 {0, 0},
1521                 {0, 0}
1522                 }
1523         },
1524         {0, 1, 2, 0,            /* 0xd0 */
1525                 {{4, 4},
1526                 {6, 7},
1527                 {0, 0},
1528                 {0, 0}
1529                 }
1530         },
1531         {1, 1, 3, 0,            /* 0xd1 */
1532                 {{0, 0},
1533                 {4, 4},
1534                 {6, 7},
1535                 {0, 0}
1536                 }
1537         },
1538         {0, 1, 3, 0,            /* 0xd2 */
1539                 {{1, 1},
1540                 {4, 4},
1541                 {6, 7},
1542                 {0, 0}
1543                 }
1544         },
1545         {1, 1, 3, 0,            /* 0xd3 */
1546                 {{0, 1},
1547                 {4, 4},
1548                 {6, 7},
1549                 {0, 0}
1550                 }
1551         },
1552         {0, 1, 3, 0,            /* 0xd4 */
1553                 {{2, 2},
1554                 {4, 4},
1555                 {6, 7},
1556                 {0, 0}
1557                 }
1558         },
1559         {1, 1, 4, 0,            /* 0xd5 */
1560                 {{0, 0},
1561                 {2, 2},
1562                 {4, 4},
1563                 {6, 7}
1564                 }
1565         },
1566         {0, 1, 3, 0,            /* 0xd6 */
1567                 {{1, 2},
1568                 {4, 4},
1569                 {6, 7},
1570                 {0, 0}
1571                 }
1572         },
1573         {1, 1, 3, 0,            /* 0xd7 */
1574                 {{0, 2},
1575                 {4, 4},
1576                 {6, 7},
1577                 {0, 0}
1578                 }
1579         },
1580         {0, 1, 2, 0,            /* 0xd8 */
1581                 {{3, 4},
1582                 {6, 7},
1583                 {0, 0},
1584                 {0, 0}
1585                 }
1586         },
1587         {1, 1, 3, 0,            /* 0xd9 */
1588                 {{0, 0},
1589                 {3, 4},
1590                 {6, 7},
1591                 {0, 0}
1592                 }
1593         },
1594         {0, 1, 3, 0,            /* 0xda */
1595                 {{1, 1},
1596                 {3, 4},
1597                 {6, 7},
1598                 {0, 0}
1599                 }
1600         },
1601         {1, 1, 3, 0,            /* 0xdb */
1602                 {{0, 1},
1603                 {3, 4},
1604                 {6, 7},
1605                 {0, 0}
1606                 }
1607         },
1608         {0, 1, 2, 0,            /* 0xdc */
1609                 {{2, 4},
1610                 {6, 7},
1611                 {0, 0},
1612                 {0, 0}
1613                 }
1614         },
1615         {1, 1, 3, 0,            /* 0xdd */
1616                 {{0, 0},
1617                 {2, 4},
1618                 {6, 7},
1619                 {0, 0}
1620                 }
1621         },
1622         {0, 1, 2, 0,            /* 0xde */
1623                 {{1, 4},
1624                 {6, 7},
1625                 {0, 0},
1626                 {0, 0}
1627                 }
1628         },
1629         {1, 1, 2, 0,            /* 0xdf */
1630                 {{0, 4},
1631                 {6, 7},
1632                 {0, 0},
1633                 {0, 0}
1634                 }
1635         },
1636         {0, 1, 1, 0,            /* 0xe0 */
1637                 {{5, 7},
1638                 {0, 0},
1639                 {0, 0},
1640                 {0, 0}
1641                 }
1642         },
1643         {1, 1, 2, 0,            /* 0xe1 */
1644                 {{0, 0},
1645                 {5, 7},
1646                 {0, 0},
1647                 {0, 0}
1648                 }
1649         },
1650         {0, 1, 2, 0,            /* 0xe2 */
1651                 {{1, 1},
1652                 {5, 7},
1653                 {0, 0},
1654                 {0, 0}
1655                 }
1656         },
1657         {1, 1, 2, 0,            /* 0xe3 */
1658                 {{0, 1},
1659                 {5, 7},
1660                 {0, 0},
1661                 {0, 0}
1662                 }
1663         },
1664         {0, 1, 2, 0,            /* 0xe4 */
1665                 {{2, 2},
1666                 {5, 7},
1667                 {0, 0},
1668                 {0, 0}
1669                 }
1670         },
1671         {1, 1, 3, 0,            /* 0xe5 */
1672                 {{0, 0},
1673                 {2, 2},
1674                 {5, 7},
1675                 {0, 0}
1676                 }
1677         },
1678         {0, 1, 2, 0,            /* 0xe6 */
1679                 {{1, 2},
1680                 {5, 7},
1681                 {0, 0},
1682                 {0, 0}
1683                 }
1684         },
1685         {1, 1, 2, 0,            /* 0xe7 */
1686                 {{0, 2},
1687                 {5, 7},
1688                 {0, 0},
1689                 {0, 0}
1690                 }
1691         },
1692         {0, 1, 2, 0,            /* 0xe8 */
1693                 {{3, 3},
1694                 {5, 7},
1695                 {0, 0},
1696                 {0, 0}
1697                 }
1698         },
1699         {1, 1, 3, 0,            /* 0xe9 */
1700                 {{0, 0},
1701                 {3, 3},
1702                 {5, 7},
1703                 {0, 0}
1704                 }
1705         },
1706         {0, 1, 3, 0,            /* 0xea */
1707                 {{1, 1},
1708                 {3, 3},
1709                 {5, 7},
1710                 {0, 0}
1711                 }
1712         },
1713         {1, 1, 3, 0,            /* 0xeb */
1714                 {{0, 1},
1715                 {3, 3},
1716                 {5, 7},
1717                 {0, 0}
1718                 }
1719         },
1720         {0, 1, 2, 0,            /* 0xec */
1721                 {{2, 3},
1722                 {5, 7},
1723                 {0, 0},
1724                 {0, 0}
1725                 }
1726         },
1727         {1, 1, 3, 0,            /* 0xed */
1728                 {{0, 0},
1729                 {2, 3},
1730                 {5, 7},
1731                 {0, 0}
1732                 }
1733         },
1734         {0, 1, 2, 0,            /* 0xee */
1735                 {{1, 3},
1736                 {5, 7},
1737                 {0, 0},
1738                 {0, 0}
1739                 }
1740         },
1741         {1, 1, 2, 0,            /* 0xef */
1742                 {{0, 3},
1743                 {5, 7},
1744                 {0, 0},
1745                 {0, 0}
1746                 }
1747         },
1748         {0, 1, 1, 0,            /* 0xf0 */
1749                 {{4, 7},
1750                 {0, 0},
1751                 {0, 0},
1752                 {0, 0}
1753                 }
1754         },
1755         {1, 1, 2, 0,            /* 0xf1 */
1756                 {{0, 0},
1757                 {4, 7},
1758                 {0, 0},
1759                 {0, 0}
1760                 }
1761         },
1762         {0, 1, 2, 0,            /* 0xf2 */
1763                 {{1, 1},
1764                 {4, 7},
1765                 {0, 0},
1766                 {0, 0}
1767                 }
1768         },
1769         {1, 1, 2, 0,            /* 0xf3 */
1770                 {{0, 1},
1771                 {4, 7},
1772                 {0, 0},
1773                 {0, 0}
1774                 }
1775         },
1776         {0, 1, 2, 0,            /* 0xf4 */
1777                 {{2, 2},
1778                 {4, 7},
1779                 {0, 0},
1780                 {0, 0}
1781                 }
1782         },
1783         {1, 1, 3, 0,            /* 0xf5 */
1784                 {{0, 0},
1785                 {2, 2},
1786                 {4, 7},
1787                 {0, 0}
1788                 }
1789         },
1790         {0, 1, 2, 0,            /* 0xf6 */
1791                 {{1, 2},
1792                 {4, 7},
1793                 {0, 0},
1794                 {0, 0}
1795                 }
1796         },
1797         {1, 1, 2, 0,            /* 0xf7 */
1798                 {{0, 2},
1799                 {4, 7},
1800                 {0, 0},
1801                 {0, 0}
1802                 }
1803         },
1804         {0, 1, 1, 0,            /* 0xf8 */
1805                 {{3, 7},
1806                 {0, 0},
1807                 {0, 0},
1808                 {0, 0}
1809                 }
1810         },
1811         {1, 1, 2, 0,            /* 0xf9 */
1812                 {{0, 0},
1813                 {3, 7},
1814                 {0, 0},
1815                 {0, 0}
1816                 }
1817         },
1818         {0, 1, 2, 0,            /* 0xfa */
1819                 {{1, 1},
1820                 {3, 7},
1821                 {0, 0},
1822                 {0, 0}
1823                 }
1824         },
1825         {1, 1, 2, 0,            /* 0xfb */
1826                 {{0, 1},
1827                 {3, 7},
1828                 {0, 0},
1829                 {0, 0}
1830                 }
1831         },
1832         {0, 1, 1, 0,            /* 0xfc */
1833                 {{2, 7},
1834                 {0, 0},
1835                 {0, 0},
1836                 {0, 0}
1837                 }
1838         },
1839         {1, 1, 2, 0,            /* 0xfd */
1840                 {{0, 0},
1841                 {2, 7},
1842                 {0, 0},
1843                 {0, 0}
1844                 }
1845         },
1846         {0, 1, 1, 0,            /* 0xfe */
1847                 {{1, 7},
1848                 {0, 0},
1849                 {0, 0},
1850                 {0, 0}
1851                 }
1852         },
1853         {1, 1, 1, 0,            /* 0xff */
1854                 {{0, 7},
1855                 {0, 0},
1856                 {0, 0},
1857                 {0, 0}
1858                 }
1859         }
1860 };
1861
1862
1863 int
1864 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1865     int ipv4_addr_legal,
1866     int ipv6_addr_legal,
1867     int loopback_scope,
1868     int ipv4_local_scope,
1869     int local_scope,
1870     int site_scope,
1871     int do_update)
1872 {
1873         if ((loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881         case AF_INET:
1882                 if (ipv4_addr_legal) {
1883                         struct sockaddr_in *sin;
1884
1885                         sin = (struct sockaddr_in *)&ifa->address.sin;
1886                         if (sin->sin_addr.s_addr == 0) {
1887                                 /* not in scope , unspecified */
1888                                 return (0);
1889                         }
1890                         if ((ipv4_local_scope == 0) &&
1891                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1892                                 /* private address not in scope */
1893                                 return (0);
1894                         }
1895                 } else {
1896                         return (0);
1897                 }
1898                 break;
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1941 {
1942         struct sctp_paramhdr *parmh;
1943         struct mbuf *mret;
1944         int len;
1945
1946         if (ifa->address.sa.sa_family == AF_INET) {
1947                 len = sizeof(struct sctp_ipv4addr_param);
1948         } else if (ifa->address.sa.sa_family == AF_INET6) {
1949                 len = sizeof(struct sctp_ipv6addr_param);
1950         } else {
1951                 /* unknown type */
1952                 return (m);
1953         }
1954         if (M_TRAILINGSPACE(m) >= len) {
1955                 /* easy side we just drop it on the end */
1956                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1957                 mret = m;
1958         } else {
1959                 /* Need more space */
1960                 mret = m;
1961                 while (SCTP_BUF_NEXT(mret) != NULL) {
1962                         mret = SCTP_BUF_NEXT(mret);
1963                 }
1964                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1965                 if (SCTP_BUF_NEXT(mret) == NULL) {
1966                         /* We are hosed, can't add more addresses */
1967                         return (m);
1968                 }
1969                 mret = SCTP_BUF_NEXT(mret);
1970                 parmh = mtod(mret, struct sctp_paramhdr *);
1971         }
1972         /* now add the parameter */
1973         switch (ifa->address.sa.sa_family) {
1974         case AF_INET:
1975                 {
1976                         struct sctp_ipv4addr_param *ipv4p;
1977                         struct sockaddr_in *sin;
1978
1979                         sin = (struct sockaddr_in *)&ifa->address.sin;
1980                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1981                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1982                         parmh->param_length = htons(len);
1983                         ipv4p->addr = sin->sin_addr.s_addr;
1984                         SCTP_BUF_LEN(mret) += len;
1985                         break;
1986                 }
1987 #ifdef INET6
1988         case AF_INET6:
1989                 {
1990                         struct sctp_ipv6addr_param *ipv6p;
1991                         struct sockaddr_in6 *sin6;
1992
1993                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1994                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1995                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1996                         parmh->param_length = htons(len);
1997                         memcpy(ipv6p->addr, &sin6->sin6_addr,
1998                             sizeof(ipv6p->addr));
1999                         /* clear embedded scope in the address */
2000                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2001                         SCTP_BUF_LEN(mret) += len;
2002                         break;
2003                 }
2004 #endif
2005         default:
2006                 return (m);
2007         }
2008         return (mret);
2009 }
2010
2011
2012 struct mbuf *
2013 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2014     struct mbuf *m_at, int cnt_inits_to)
2015 {
2016         struct sctp_vrf *vrf = NULL;
2017         int cnt, limit_out = 0, total_count;
2018         uint32_t vrf_id;
2019
2020         vrf_id = inp->def_vrf_id;
2021         SCTP_IPI_ADDR_RLOCK();
2022         vrf = sctp_find_vrf(vrf_id);
2023         if (vrf == NULL) {
2024                 SCTP_IPI_ADDR_RUNLOCK();
2025                 return (m_at);
2026         }
2027         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2028                 struct sctp_ifa *sctp_ifap;
2029                 struct sctp_ifn *sctp_ifnp;
2030
2031                 cnt = cnt_inits_to;
2032                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2033                         limit_out = 1;
2034                         cnt = SCTP_ADDRESS_LIMIT;
2035                         goto skip_count;
2036                 }
2037                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2038                         if ((scope->loopback_scope == 0) &&
2039                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2040                                 /*
2041                                  * Skip loopback devices if loopback_scope
2042                                  * not set
2043                                  */
2044                                 continue;
2045                         }
2046                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2047                                 if (sctp_is_address_in_scope(sctp_ifap,
2048                                     scope->ipv4_addr_legal,
2049                                     scope->ipv6_addr_legal,
2050                                     scope->loopback_scope,
2051                                     scope->ipv4_local_scope,
2052                                     scope->local_scope,
2053                                     scope->site_scope, 1) == 0) {
2054                                         continue;
2055                                 }
2056                                 cnt++;
2057                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2058                                         break;
2059                                 }
2060                         }
2061                         if (cnt > SCTP_ADDRESS_LIMIT) {
2062                                 break;
2063                         }
2064                 }
2065 skip_count:
2066                 if (cnt > 1) {
2067                         total_count = 0;
2068                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2069                                 cnt = 0;
2070                                 if ((scope->loopback_scope == 0) &&
2071                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2072                                         /*
2073                                          * Skip loopback devices if
2074                                          * loopback_scope not set
2075                                          */
2076                                         continue;
2077                                 }
2078                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2079                                         if (sctp_is_address_in_scope(sctp_ifap,
2080                                             scope->ipv4_addr_legal,
2081                                             scope->ipv6_addr_legal,
2082                                             scope->loopback_scope,
2083                                             scope->ipv4_local_scope,
2084                                             scope->local_scope,
2085                                             scope->site_scope, 0) == 0) {
2086                                                 continue;
2087                                         }
2088                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2089                                         if (limit_out) {
2090                                                 cnt++;
2091                                                 total_count++;
2092                                                 if (cnt >= 2) {
2093                                                         /*
2094                                                          * two from each
2095                                                          * address
2096                                                          */
2097                                                         break;
2098                                                 }
2099                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2100                                                         /* No more addresses */
2101                                                         break;
2102                                                 }
2103                                         }
2104                                 }
2105                         }
2106                 }
2107         } else {
2108                 struct sctp_laddr *laddr;
2109
2110                 cnt = cnt_inits_to;
2111                 /* First, how many ? */
2112                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2113                         if (laddr->ifa == NULL) {
2114                                 continue;
2115                         }
2116                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2117                                 /*
2118                                  * Address being deleted by the system, dont
2119                                  * list.
2120                                  */
2121                                 continue;
2122                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2123                                 /*
2124                                  * Address being deleted on this ep don't
2125                                  * list.
2126                                  */
2127                                 continue;
2128                         }
2129                         if (sctp_is_address_in_scope(laddr->ifa,
2130                             scope->ipv4_addr_legal,
2131                             scope->ipv6_addr_legal,
2132                             scope->loopback_scope,
2133                             scope->ipv4_local_scope,
2134                             scope->local_scope,
2135                             scope->site_scope, 1) == 0) {
2136                                 continue;
2137                         }
2138                         cnt++;
2139                 }
2140                 if (cnt > SCTP_ADDRESS_LIMIT) {
2141                         limit_out = 1;
2142                 }
2143                 /*
2144                  * To get through a NAT we only list addresses if we have
2145                  * more than one. That way if you just bind a single address
2146                  * we let the source of the init dictate our address.
2147                  */
2148                 if (cnt > 1) {
2149                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2150                                 cnt = 0;
2151                                 if (laddr->ifa == NULL) {
2152                                         continue;
2153                                 }
2154                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2155                                         continue;
2156
2157                                 if (sctp_is_address_in_scope(laddr->ifa,
2158                                     scope->ipv4_addr_legal,
2159                                     scope->ipv6_addr_legal,
2160                                     scope->loopback_scope,
2161                                     scope->ipv4_local_scope,
2162                                     scope->local_scope,
2163                                     scope->site_scope, 0) == 0) {
2164                                         continue;
2165                                 }
2166                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2167                                 cnt++;
2168                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2169                                         break;
2170                                 }
2171                         }
2172                 }
2173         }
2174         SCTP_IPI_ADDR_RUNLOCK();
2175         return (m_at);
2176 }
2177
2178 static struct sctp_ifa *
2179 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2180     uint8_t dest_is_loop,
2181     uint8_t dest_is_priv,
2182     sa_family_t fam)
2183 {
2184         uint8_t dest_is_global = 0;
2185
2186         /* dest_is_priv is true if destination is a private address */
2187         /* dest_is_loop is true if destination is a loopback addresses */
2188
2189         /**
2190          * Here we determine if its a preferred address. A preferred address
2191          * means it is the same scope or higher scope then the destination.
2192          * L = loopback, P = private, G = global
2193          * -----------------------------------------
2194          *    src    |  dest | result
2195          *  ----------------------------------------
2196          *     L     |    L  |    yes
2197          *  -----------------------------------------
2198          *     P     |    L  |    yes-v4 no-v6
2199          *  -----------------------------------------
2200          *     G     |    L  |    yes-v4 no-v6
2201          *  -----------------------------------------
2202          *     L     |    P  |    no
2203          *  -----------------------------------------
2204          *     P     |    P  |    yes
2205          *  -----------------------------------------
2206          *     G     |    P  |    no
2207          *   -----------------------------------------
2208          *     L     |    G  |    no
2209          *   -----------------------------------------
2210          *     P     |    G  |    no
2211          *    -----------------------------------------
2212          *     G     |    G  |    yes
2213          *    -----------------------------------------
2214          */
2215
2216         if (ifa->address.sa.sa_family != fam) {
2217                 /* forget mis-matched family */
2218                 return (NULL);
2219         }
2220         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2221                 dest_is_global = 1;
2222         }
2223         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2224         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2225         /* Ok the address may be ok */
2226         if (fam == AF_INET6) {
2227                 /* ok to use deprecated addresses? no lets not! */
2228                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2229                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2230                         return (NULL);
2231                 }
2232                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2233                         if (dest_is_loop) {
2234                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2235                                 return (NULL);
2236                         }
2237                 }
2238                 if (ifa->src_is_glob) {
2239                         if (dest_is_loop) {
2240                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2241                                 return (NULL);
2242                         }
2243                 }
2244         }
2245         /*
2246          * Now that we know what is what, implement or table this could in
2247          * theory be done slicker (it used to be), but this is
2248          * straightforward and easier to validate :-)
2249          */
2250         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2251             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2252         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2253             dest_is_loop, dest_is_priv, dest_is_global);
2254
2255         if ((ifa->src_is_loop) && (dest_is_priv)) {
2256                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2257                 return (NULL);
2258         }
2259         if ((ifa->src_is_glob) && (dest_is_priv)) {
2260                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2261                 return (NULL);
2262         }
2263         if ((ifa->src_is_loop) && (dest_is_global)) {
2264                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2265                 return (NULL);
2266         }
2267         if ((ifa->src_is_priv) && (dest_is_global)) {
2268                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2269                 return (NULL);
2270         }
2271         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2272         /* its a preferred address */
2273         return (ifa);
2274 }
2275
2276 static struct sctp_ifa *
2277 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2278     uint8_t dest_is_loop,
2279     uint8_t dest_is_priv,
2280     sa_family_t fam)
2281 {
2282         uint8_t dest_is_global = 0;
2283
2284         /*
2285          * Here we determine if its a acceptable address. A acceptable
2286          * address means it is the same scope or higher scope but we can
2287          * allow for NAT which means its ok to have a global dest and a
2288          * private src.
2289          *
2290          * L = loopback, P = private, G = global
2291          * ----------------------------------------- src    |  dest | result
2292          * ----------------------------------------- L     |   L   |    yes
2293          * ----------------------------------------- P     |   L   |
2294          * yes-v4 no-v6 ----------------------------------------- G     |
2295          * L   |    yes ----------------------------------------- L     |
2296          * P   |    no ----------------------------------------- P     |   P
2297          * |    yes ----------------------------------------- G     |   P
2298          * |    yes - May not work -----------------------------------------
2299          * L     |   G   |    no ----------------------------------------- P
2300          * |   G   |    yes - May not work
2301          * ----------------------------------------- G     |   G   |    yes
2302          * -----------------------------------------
2303          */
2304
2305         if (ifa->address.sa.sa_family != fam) {
2306                 /* forget non matching family */
2307                 return (NULL);
2308         }
2309         /* Ok the address may be ok */
2310         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2311                 dest_is_global = 1;
2312         }
2313         if (fam == AF_INET6) {
2314                 /* ok to use deprecated addresses? */
2315                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2316                         return (NULL);
2317                 }
2318                 if (ifa->src_is_priv) {
2319                         /* Special case, linklocal to loop */
2320                         if (dest_is_loop)
2321                                 return (NULL);
2322                 }
2323         }
2324         /*
2325          * Now that we know what is what, implement our table. This could in
2326          * theory be done slicker (it used to be), but this is
2327          * straightforward and easier to validate :-)
2328          */
2329         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2330                 return (NULL);
2331         }
2332         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2333                 return (NULL);
2334         }
2335         /* its an acceptable address */
2336         return (ifa);
2337 }
2338
2339 int
2340 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2341 {
2342         struct sctp_laddr *laddr;
2343
2344         if (stcb == NULL) {
2345                 /* There are no restrictions, no TCB :-) */
2346                 return (0);
2347         }
2348         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2349                 if (laddr->ifa == NULL) {
2350                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2351                             __FUNCTION__);
2352                         continue;
2353                 }
2354                 if (laddr->ifa == ifa) {
2355                         /* Yes it is on the list */
2356                         return (1);
2357                 }
2358         }
2359         return (0);
2360 }
2361
2362
2363 int
2364 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2365 {
2366         struct sctp_laddr *laddr;
2367
2368         if (ifa == NULL)
2369                 return (0);
2370         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2371                 if (laddr->ifa == NULL) {
2372                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2373                             __FUNCTION__);
2374                         continue;
2375                 }
2376                 if ((laddr->ifa == ifa) && laddr->action == 0)
2377                         /* same pointer */
2378                         return (1);
2379         }
2380         return (0);
2381 }
2382
2383
2384
2385 static struct sctp_ifa *
2386 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2387     sctp_route_t * ro,
2388     uint32_t vrf_id,
2389     int non_asoc_addr_ok,
2390     uint8_t dest_is_priv,
2391     uint8_t dest_is_loop,
2392     sa_family_t fam)
2393 {
2394         struct sctp_laddr *laddr, *starting_point;
2395         void *ifn;
2396         int resettotop = 0;
2397         struct sctp_ifn *sctp_ifn;
2398         struct sctp_ifa *sctp_ifa, *sifa;
2399         struct sctp_vrf *vrf;
2400         uint32_t ifn_index;
2401
2402         vrf = sctp_find_vrf(vrf_id);
2403         if (vrf == NULL)
2404                 return (NULL);
2405
2406         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2407         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2408         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2409         /*
2410          * first question, is the ifn we will emit on in our list, if so, we
2411          * want such an address. Note that we first looked for a preferred
2412          * address.
2413          */
2414         if (sctp_ifn) {
2415                 /* is a preferred one on the interface we route out? */
2416                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2417                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2418                             (non_asoc_addr_ok == 0))
2419                                 continue;
2420                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2421                             dest_is_loop,
2422                             dest_is_priv, fam);
2423                         if (sifa == NULL)
2424                                 continue;
2425                         if (sctp_is_addr_in_ep(inp, sifa)) {
2426                                 atomic_add_int(&sifa->refcount, 1);
2427                                 return (sifa);
2428                         }
2429                 }
2430         }
2431         /*
2432          * ok, now we now need to find one on the list of the addresses. We
2433          * can't get one on the emitting interface so let's find first a
2434          * preferred one. If not that an acceptable one otherwise... we
2435          * return NULL.
2436          */
2437         starting_point = inp->next_addr_touse;
2438 once_again:
2439         if (inp->next_addr_touse == NULL) {
2440                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2441                 resettotop = 1;
2442         }
2443         for (laddr = inp->next_addr_touse; laddr;
2444             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2445                 if (laddr->ifa == NULL) {
2446                         /* address has been removed */
2447                         continue;
2448                 }
2449                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2450                         /* address is being deleted */
2451                         continue;
2452                 }
2453                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2454                     dest_is_priv, fam);
2455                 if (sifa == NULL)
2456                         continue;
2457                 atomic_add_int(&sifa->refcount, 1);
2458                 return (sifa);
2459         }
2460         if (resettotop == 0) {
2461                 inp->next_addr_touse = NULL;
2462                 goto once_again;
2463         }
2464         inp->next_addr_touse = starting_point;
2465         resettotop = 0;
2466 once_again_too:
2467         if (inp->next_addr_touse == NULL) {
2468                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2469                 resettotop = 1;
2470         }
2471         /* ok, what about an acceptable address in the inp */
2472         for (laddr = inp->next_addr_touse; laddr;
2473             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2474                 if (laddr->ifa == NULL) {
2475                         /* address has been removed */
2476                         continue;
2477                 }
2478                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2479                         /* address is being deleted */
2480                         continue;
2481                 }
2482                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2483                     dest_is_priv, fam);
2484                 if (sifa == NULL)
2485                         continue;
2486                 atomic_add_int(&sifa->refcount, 1);
2487                 return (sifa);
2488         }
2489         if (resettotop == 0) {
2490                 inp->next_addr_touse = NULL;
2491                 goto once_again_too;
2492         }
2493         /*
2494          * no address bound can be a source for the destination we are in
2495          * trouble
2496          */
2497         return (NULL);
2498 }
2499
2500
2501
2502 static struct sctp_ifa *
2503 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2504     struct sctp_tcb *stcb,
2505     struct sctp_nets *net,
2506     sctp_route_t * ro,
2507     uint32_t vrf_id,
2508     uint8_t dest_is_priv,
2509     uint8_t dest_is_loop,
2510     int non_asoc_addr_ok,
2511     sa_family_t fam)
2512 {
2513         struct sctp_laddr *laddr, *starting_point;
2514         void *ifn;
2515         struct sctp_ifn *sctp_ifn;
2516         struct sctp_ifa *sctp_ifa, *sifa;
2517         uint8_t start_at_beginning = 0;
2518         struct sctp_vrf *vrf;
2519         uint32_t ifn_index;
2520
2521         /*
2522          * first question, is the ifn we will emit on in our list, if so, we
2523          * want that one.
2524          */
2525         vrf = sctp_find_vrf(vrf_id);
2526         if (vrf == NULL)
2527                 return (NULL);
2528
2529         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2530         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2531         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2532
2533         /*
2534          * first question, is the ifn we will emit on in our list?  If so,
2535          * we want that one. First we look for a preferred. Second, we go
2536          * for an acceptable.
2537          */
2538         if (sctp_ifn) {
2539                 /* first try for a preferred address on the ep */
2540                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2541                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2542                                 continue;
2543                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2544                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2545                                 if (sifa == NULL)
2546                                         continue;
2547                                 if (((non_asoc_addr_ok == 0) &&
2548                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2549                                     (non_asoc_addr_ok &&
2550                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2551                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2552                                         /* on the no-no list */
2553                                         continue;
2554                                 }
2555                                 atomic_add_int(&sifa->refcount, 1);
2556                                 return (sifa);
2557                         }
2558                 }
2559                 /* next try for an acceptable address on the ep */
2560                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2561                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2562                                 continue;
2563                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2564                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2565                                 if (sifa == NULL)
2566                                         continue;
2567                                 if (((non_asoc_addr_ok == 0) &&
2568                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2569                                     (non_asoc_addr_ok &&
2570                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2571                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2572                                         /* on the no-no list */
2573                                         continue;
2574                                 }
2575                                 atomic_add_int(&sifa->refcount, 1);
2576                                 return (sifa);
2577                         }
2578                 }
2579
2580         }
2581         /*
2582          * if we can't find one like that then we must look at all addresses
2583          * bound to pick one at first preferable then secondly acceptable.
2584          */
2585         starting_point = stcb->asoc.last_used_address;
2586 sctp_from_the_top:
2587         if (stcb->asoc.last_used_address == NULL) {
2588                 start_at_beginning = 1;
2589                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2590         }
2591         /* search beginning with the last used address */
2592         for (laddr = stcb->asoc.last_used_address; laddr;
2593             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2594                 if (laddr->ifa == NULL) {
2595                         /* address has been removed */
2596                         continue;
2597                 }
2598                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2599                         /* address is being deleted */
2600                         continue;
2601                 }
2602                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2603                 if (sifa == NULL)
2604                         continue;
2605                 if (((non_asoc_addr_ok == 0) &&
2606                     (sctp_is_addr_restricted(stcb, sifa))) ||
2607                     (non_asoc_addr_ok &&
2608                     (sctp_is_addr_restricted(stcb, sifa)) &&
2609                     (!sctp_is_addr_pending(stcb, sifa)))) {
2610                         /* on the no-no list */
2611                         continue;
2612                 }
2613                 stcb->asoc.last_used_address = laddr;
2614                 atomic_add_int(&sifa->refcount, 1);
2615                 return (sifa);
2616         }
2617         if (start_at_beginning == 0) {
2618                 stcb->asoc.last_used_address = NULL;
2619                 goto sctp_from_the_top;
2620         }
2621         /* now try for any higher scope than the destination */
2622         stcb->asoc.last_used_address = starting_point;
2623         start_at_beginning = 0;
2624 sctp_from_the_top2:
2625         if (stcb->asoc.last_used_address == NULL) {
2626                 start_at_beginning = 1;
2627                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2628         }
2629         /* search beginning with the last used address */
2630         for (laddr = stcb->asoc.last_used_address; laddr;
2631             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2632                 if (laddr->ifa == NULL) {
2633                         /* address has been removed */
2634                         continue;
2635                 }
2636                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2637                         /* address is being deleted */
2638                         continue;
2639                 }
2640                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2641                     dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top2;
2659         }
2660         return (NULL);
2661 }
2662
2663 static struct sctp_ifa *
2664 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2665     struct sctp_tcb *stcb,
2666     int non_asoc_addr_ok,
2667     uint8_t dest_is_loop,
2668     uint8_t dest_is_priv,
2669     int addr_wanted,
2670     sa_family_t fam,
2671     sctp_route_t * ro
2672 )
2673 {
2674         struct sctp_ifa *ifa, *sifa;
2675         int num_eligible_addr = 0;
2676
2677 #ifdef INET6
2678         struct sockaddr_in6 sin6, lsa6;
2679
2680         if (fam == AF_INET6) {
2681                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2682                 (void)sa6_recoverscope(&sin6);
2683         }
2684 #endif                          /* INET6 */
2685         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2686                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2687                     (non_asoc_addr_ok == 0))
2688                         continue;
2689                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2690                     dest_is_priv, fam);
2691                 if (sifa == NULL)
2692                         continue;
2693 #ifdef INET6
2694                 if (fam == AF_INET6 &&
2695                     dest_is_loop &&
2696                     sifa->src_is_loop && sifa->src_is_priv) {
2697                         /*
2698                          * don't allow fe80::1 to be a src on loop ::1, we
2699                          * don't list it to the peer so we will get an
2700                          * abort.
2701                          */
2702                         continue;
2703                 }
2704                 if (fam == AF_INET6 &&
2705                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2706                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2707                         /*
2708                          * link-local <-> link-local must belong to the same
2709                          * scope.
2710                          */
2711                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2712                         (void)sa6_recoverscope(&lsa6);
2713                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2714                                 continue;
2715                         }
2716                 }
2717 #endif                          /* INET6 */
2718
2719                 /*
2720                  * Check if the IPv6 address matches to next-hop. In the
2721                  * mobile case, old IPv6 address may be not deleted from the
2722                  * interface. Then, the interface has previous and new
2723                  * addresses.  We should use one corresponding to the
2724                  * next-hop.  (by micchie)
2725                  */
2726 #ifdef INET6
2727                 if (stcb && fam == AF_INET6 &&
2728                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2729                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2730                             == 0) {
2731                                 continue;
2732                         }
2733                 }
2734 #endif
2735                 /* Avoid topologically incorrect IPv4 address */
2736                 if (stcb && fam == AF_INET &&
2737                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2738                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2739                                 continue;
2740                         }
2741                 }
2742                 if (stcb) {
2743                         if (sctp_is_address_in_scope(ifa,
2744                             stcb->asoc.ipv4_addr_legal,
2745                             stcb->asoc.ipv6_addr_legal,
2746                             stcb->asoc.loopback_scope,
2747                             stcb->asoc.ipv4_local_scope,
2748                             stcb->asoc.local_scope,
2749                             stcb->asoc.site_scope, 0) == 0) {
2750                                 continue;
2751                         }
2752                         if (((non_asoc_addr_ok == 0) &&
2753                             (sctp_is_addr_restricted(stcb, sifa))) ||
2754                             (non_asoc_addr_ok &&
2755                             (sctp_is_addr_restricted(stcb, sifa)) &&
2756                             (!sctp_is_addr_pending(stcb, sifa)))) {
2757                                 /*
2758                                  * It is restricted for some reason..
2759                                  * probably not yet added.
2760                                  */
2761                                 continue;
2762                         }
2763                 }
2764                 if (num_eligible_addr >= addr_wanted) {
2765                         return (sifa);
2766                 }
2767                 num_eligible_addr++;
2768         }
2769         return (NULL);
2770 }
2771
2772
2773 static int
2774 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     sa_family_t fam)
2780 {
2781         struct sctp_ifa *ifa, *sifa;
2782         int num_eligible_addr = 0;
2783
2784         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2785                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2786                     (non_asoc_addr_ok == 0)) {
2787                         continue;
2788                 }
2789                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2790                     dest_is_priv, fam);
2791                 if (sifa == NULL) {
2792                         continue;
2793                 }
2794                 if (stcb) {
2795                         if (sctp_is_address_in_scope(ifa,
2796                             stcb->asoc.ipv4_addr_legal,
2797                             stcb->asoc.ipv6_addr_legal,
2798                             stcb->asoc.loopback_scope,
2799                             stcb->asoc.ipv4_local_scope,
2800                             stcb->asoc.local_scope,
2801                             stcb->asoc.site_scope, 0) == 0) {
2802                                 continue;
2803                         }
2804                         if (((non_asoc_addr_ok == 0) &&
2805                             (sctp_is_addr_restricted(stcb, sifa))) ||
2806                             (non_asoc_addr_ok &&
2807                             (sctp_is_addr_restricted(stcb, sifa)) &&
2808                             (!sctp_is_addr_pending(stcb, sifa)))) {
2809                                 /*
2810                                  * It is restricted for some reason..
2811                                  * probably not yet added.
2812                                  */
2813                                 continue;
2814                         }
2815                 }
2816                 num_eligible_addr++;
2817         }
2818         return (num_eligible_addr);
2819 }
2820
2821 static struct sctp_ifa *
2822 sctp_choose_boundall(struct sctp_inpcb *inp,
2823     struct sctp_tcb *stcb,
2824     struct sctp_nets *net,
2825     sctp_route_t * ro,
2826     uint32_t vrf_id,
2827     uint8_t dest_is_priv,
2828     uint8_t dest_is_loop,
2829     int non_asoc_addr_ok,
2830     sa_family_t fam)
2831 {
2832         int cur_addr_num = 0, num_preferred = 0;
2833         void *ifn;
2834         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2835         struct sctp_ifa *sctp_ifa, *sifa;
2836         uint32_t ifn_index;
2837         struct sctp_vrf *vrf;
2838
2839         /*-
2840          * For boundall we can use any address in the association.
2841          * If non_asoc_addr_ok is set we can use any address (at least in
2842          * theory). So we look for preferred addresses first. If we find one,
2843          * we use it. Otherwise we next try to get an address on the
2844          * interface, which we should be able to do (unless non_asoc_addr_ok
2845          * is false and we are routed out that way). In these cases where we
2846          * can't use the address of the interface we go through all the
2847          * ifn's looking for an address we can use and fill that in. Punting
2848          * means we send back address 0, which will probably cause problems
2849          * actually since then IP will fill in the address of the route ifn,
2850          * which means we probably already rejected it.. i.e. here comes an
2851          * abort :-<.
2852          */
2853         vrf = sctp_find_vrf(vrf_id);
2854         if (vrf == NULL)
2855                 return (NULL);
2856
2857         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2858         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2859         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2860         if (sctp_ifn == NULL) {
2861                 /* ?? We don't have this guy ?? */
2862                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2863                 goto bound_all_plan_b;
2864         }
2865         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2866             ifn_index, sctp_ifn->ifn_name);
2867
2868         if (net) {
2869                 cur_addr_num = net->indx_of_eligible_next_to_use;
2870         }
2871         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2872             stcb,
2873             non_asoc_addr_ok,
2874             dest_is_loop,
2875             dest_is_priv, fam);
2876         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2877             num_preferred, sctp_ifn->ifn_name);
2878         if (num_preferred == 0) {
2879                 /*
2880                  * no eligible addresses, we must use some other interface
2881                  * address if we can find one.
2882                  */
2883                 goto bound_all_plan_b;
2884         }
2885         /*
2886          * Ok we have num_eligible_addr set with how many we can use, this
2887          * may vary from call to call due to addresses being deprecated
2888          * etc..
2889          */
2890         if (cur_addr_num >= num_preferred) {
2891                 cur_addr_num = 0;
2892         }
2893         /*
2894          * select the nth address from the list (where cur_addr_num is the
2895          * nth) and 0 is the first one, 1 is the second one etc...
2896          */
2897         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2898
2899         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2900             dest_is_priv, cur_addr_num, fam, ro);
2901
2902         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2903         if (sctp_ifa) {
2904                 atomic_add_int(&sctp_ifa->refcount, 1);
2905                 if (net) {
2906                         /* save off where the next one we will want */
2907                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2908                 }
2909                 return (sctp_ifa);
2910         }
2911         /*
2912          * plan_b: Look at all interfaces and find a preferred address. If
2913          * no preferred fall through to plan_c.
2914          */
2915 bound_all_plan_b:
2916         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2917         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2918                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2919                     sctp_ifn->ifn_name);
2920                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2921                         /* wrong base scope */
2922                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2923                         continue;
2924                 }
2925                 if ((sctp_ifn == looked_at) && looked_at) {
2926                         /* already looked at this guy */
2927                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2928                         continue;
2929                 }
2930                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2931                     dest_is_loop, dest_is_priv, fam);
2932                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2933                     "Found ifn:%p %d preferred source addresses\n",
2934                     ifn, num_preferred);
2935                 if (num_preferred == 0) {
2936                         /* None on this interface. */
2937                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2938                         continue;
2939                 }
2940                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2941                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2942                     num_preferred, sctp_ifn, cur_addr_num);
2943
2944                 /*
2945                  * Ok we have num_eligible_addr set with how many we can
2946                  * use, this may vary from call to call due to addresses
2947                  * being deprecated etc..
2948                  */
2949                 if (cur_addr_num >= num_preferred) {
2950                         cur_addr_num = 0;
2951                 }
2952                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2953                     dest_is_priv, cur_addr_num, fam, ro);
2954                 if (sifa == NULL)
2955                         continue;
2956                 if (net) {
2957                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2958                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2959                             cur_addr_num);
2960                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2961                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2962                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2963                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2964                 }
2965                 atomic_add_int(&sifa->refcount, 1);
2966                 return (sifa);
2967
2968         }
2969
2970         /* plan_c: do we have an acceptable address on the emit interface */
2971         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2972         if (emit_ifn == NULL) {
2973                 goto plan_d;
2974         }
2975         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2976                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2977                     (non_asoc_addr_ok == 0))
2978                         continue;
2979                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2980                     dest_is_priv, fam);
2981                 if (sifa == NULL)
2982                         continue;
2983                 if (stcb) {
2984                         if (sctp_is_address_in_scope(sifa,
2985                             stcb->asoc.ipv4_addr_legal,
2986                             stcb->asoc.ipv6_addr_legal,
2987                             stcb->asoc.loopback_scope,
2988                             stcb->asoc.ipv4_local_scope,
2989                             stcb->asoc.local_scope,
2990                             stcb->asoc.site_scope, 0) == 0) {
2991                                 continue;
2992                         }
2993                         if (((non_asoc_addr_ok == 0) &&
2994                             (sctp_is_addr_restricted(stcb, sifa))) ||
2995                             (non_asoc_addr_ok &&
2996                             (sctp_is_addr_restricted(stcb, sifa)) &&
2997                             (!sctp_is_addr_pending(stcb, sifa)))) {
2998                                 /*
2999                                  * It is restricted for some reason..
3000                                  * probably not yet added.
3001                                  */
3002                                 continue;
3003                         }
3004                 }
3005                 atomic_add_int(&sifa->refcount, 1);
3006                 return (sifa);
3007         }
3008 plan_d:
3009         /*
3010          * plan_d: We are in trouble. No preferred address on the emit
3011          * interface. And not even a preferred address on all interfaces. Go
3012          * out and see if we can find an acceptable address somewhere
3013          * amongst all interfaces.
3014          */
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
3016         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3017                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3018                         /* wrong base scope */
3019                         continue;
3020                 }
3021                 if ((sctp_ifn == looked_at) && looked_at)
3022                         /* already looked at this guy */
3023                         continue;
3024
3025                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3026                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                             (non_asoc_addr_ok == 0))
3028                                 continue;
3029                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3030                             dest_is_loop,
3031                             dest_is_priv, fam);
3032                         if (sifa == NULL)
3033                                 continue;
3034                         if (stcb) {
3035                                 if (sctp_is_address_in_scope(sifa,
3036                                     stcb->asoc.ipv4_addr_legal,
3037                                     stcb->asoc.ipv6_addr_legal,
3038                                     stcb->asoc.loopback_scope,
3039                                     stcb->asoc.ipv4_local_scope,
3040                                     stcb->asoc.local_scope,
3041                                     stcb->asoc.site_scope, 0) == 0) {
3042                                         continue;
3043                                 }
3044                                 if (((non_asoc_addr_ok == 0) &&
3045                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3046                                     (non_asoc_addr_ok &&
3047                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3048                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3049                                         /*
3050                                          * It is restricted for some
3051                                          * reason.. probably not yet added.
3052                                          */
3053                                         continue;
3054                                 }
3055                         }
3056                         atomic_add_int(&sifa->refcount, 1);
3057                         return (sifa);
3058                 }
3059         }
3060         /*
3061          * Ok we can find NO address to source from that is not on our
3062          * restricted list and non_asoc_address is NOT ok, or it is on our
3063          * restricted list. We can't source to it :-(
3064          */
3065         return (NULL);
3066 }
3067
3068
3069
3070 /* tcb may be NULL */
3071 struct sctp_ifa *
3072 sctp_source_address_selection(struct sctp_inpcb *inp,
3073     struct sctp_tcb *stcb,
3074     sctp_route_t * ro,
3075     struct sctp_nets *net,
3076     int non_asoc_addr_ok, uint32_t vrf_id)
3077 {
3078         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3079
3080 #ifdef INET6
3081         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3082
3083 #endif
3084         struct sctp_ifa *answer;
3085         uint8_t dest_is_priv, dest_is_loop;
3086         sa_family_t fam;
3087
3088         /*-
3089          * Rules: - Find the route if needed, cache if I can. - Look at
3090          * interface address in route, Is it in the bound list. If so we
3091          * have the best source. - If not we must rotate amongst the
3092          * addresses.
3093          *
3094          * Cavets and issues
3095          *
3096          * Do we need to pay attention to scope. We can have a private address
3097          * or a global address we are sourcing or sending to. So if we draw
3098          * it out
3099          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3100          * For V4
3101          * ------------------------------------------
3102          *      source     *      dest  *  result
3103          * -----------------------------------------
3104          * <a>  Private    *    Global  *  NAT
3105          * -----------------------------------------
3106          * <b>  Private    *    Private *  No problem
3107          * -----------------------------------------
3108          * <c>  Global     *    Private *  Huh, How will this work?
3109          * -----------------------------------------
3110          * <d>  Global     *    Global  *  No Problem
3111          *------------------------------------------
3112          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3113          * For V6
3114          *------------------------------------------
3115          *      source     *      dest  *  result
3116          * -----------------------------------------
3117          * <a>  Linklocal  *    Global  *
3118          * -----------------------------------------
3119          * <b>  Linklocal  * Linklocal  *  No problem
3120          * -----------------------------------------
3121          * <c>  Global     * Linklocal  *  Huh, How will this work?
3122          * -----------------------------------------
3123          * <d>  Global     *    Global  *  No Problem
3124          *------------------------------------------
3125          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3126          *
3127          * And then we add to that what happens if there are multiple addresses
3128          * assigned to an interface. Remember the ifa on a ifn is a linked
3129          * list of addresses. So one interface can have more than one IP
3130          * address. What happens if we have both a private and a global
3131          * address? Do we then use context of destination to sort out which
3132          * one is best? And what about NAT's sending P->G may get you a NAT
3133          * translation, or should you select the G thats on the interface in
3134          * preference.
3135          *
3136          * Decisions:
3137          *
3138          * - count the number of addresses on the interface.
3139          * - if it is one, no problem except case <c>.
3140          *   For <a> we will assume a NAT out there.
3141          * - if there are more than one, then we need to worry about scope P
3142          *   or G. We should prefer G -> G and P -> P if possible.
3143          *   Then as a secondary fall back to mixed types G->P being a last
3144          *   ditch one.
3145          * - The above all works for bound all, but bound specific we need to
3146          *   use the same concept but instead only consider the bound
3147          *   addresses. If the bound set is NOT assigned to the interface then
3148          *   we must use rotation amongst the bound addresses..
3149          */
3150         if (ro->ro_rt == NULL) {
3151                 /*
3152                  * Need a route to cache.
3153                  */
3154                 SCTP_RTALLOC(ro, vrf_id);
3155         }
3156         if (ro->ro_rt == NULL) {
3157                 return (NULL);
3158         }
3159         fam = to->sin_family;
3160         dest_is_priv = dest_is_loop = 0;
3161         /* Setup our scopes for the destination */
3162         switch (fam) {
3163         case AF_INET:
3164                 /* Scope based on outbound address */
3165                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3166                         dest_is_loop = 1;
3167                         if (net != NULL) {
3168                                 /* mark it as local */
3169                                 net->addr_is_local = 1;
3170                         }
3171                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3172                         dest_is_priv = 1;
3173                 }
3174                 break;
3175 #ifdef INET6
3176         case AF_INET6:
3177                 /* Scope based on outbound address */
3178                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3179                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3180                         /*
3181                          * If the address is a loopback address, which
3182                          * consists of "::1" OR "fe80::1%lo0", we are
3183                          * loopback scope. But we don't use dest_is_priv
3184                          * (link local addresses).
3185                          */
3186                         dest_is_loop = 1;
3187                         if (net != NULL) {
3188                                 /* mark it as local */
3189                                 net->addr_is_local = 1;
3190                         }
3191                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3192                         dest_is_priv = 1;
3193                 }
3194                 break;
3195 #endif
3196         }
3197         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3198         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3199         SCTP_IPI_ADDR_RLOCK();
3200         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3201                 /*
3202                  * Bound all case
3203                  */
3204                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3205                     dest_is_priv, dest_is_loop,
3206                     non_asoc_addr_ok, fam);
3207                 SCTP_IPI_ADDR_RUNLOCK();
3208                 return (answer);
3209         }
3210         /*
3211          * Subset bound case
3212          */
3213         if (stcb) {
3214                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3215                     vrf_id, dest_is_priv,
3216                     dest_is_loop,
3217                     non_asoc_addr_ok, fam);
3218         } else {
3219                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3220                     non_asoc_addr_ok,
3221                     dest_is_priv,
3222                     dest_is_loop, fam);
3223         }
3224         SCTP_IPI_ADDR_RUNLOCK();
3225         return (answer);
3226 }
3227
3228 static int
3229 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3230 {
3231         struct cmsghdr cmh;
3232         int tlen, at;
3233
3234         tlen = SCTP_BUF_LEN(control);
3235         at = 0;
3236         /*
3237          * Independent of how many mbufs, find the c_type inside the control
3238          * structure and copy out the data.
3239          */
3240         while (at < tlen) {
3241                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3242                         /* not enough room for one more we are done. */
3243                         return (0);
3244                 }
3245                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3246                 if (((int)cmh.cmsg_len + at) > tlen) {
3247                         /*
3248                          * this is real messed up since there is not enough
3249                          * data here to cover the cmsg header. We are done.
3250                          */
3251                         return (0);
3252                 }
3253                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3254                     (c_type == cmh.cmsg_type)) {
3255                         /* found the one we want, copy it out */
3256                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3257                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3258                                 /*
3259                                  * space of cmsg_len after header not big
3260                                  * enough
3261                                  */
3262                                 return (0);
3263                         }
3264                         m_copydata(control, at, cpsize, data);
3265                         return (1);
3266                 } else {
3267                         at += CMSG_ALIGN(cmh.cmsg_len);
3268                         if (cmh.cmsg_len == 0) {
3269                                 break;
3270                         }
3271                 }
3272         }
3273         /* not found */
3274         return (0);
3275 }
3276
3277 static struct mbuf *
3278 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3279     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3280 {
3281         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3282         struct sctp_state_cookie *stc;
3283         struct sctp_paramhdr *ph;
3284         uint8_t *foo;
3285         int sig_offset;
3286         uint16_t cookie_sz;
3287
3288         mret = NULL;
3289         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3290             sizeof(struct sctp_paramhdr)), 0,
3291             M_DONTWAIT, 1, MT_DATA);
3292         if (mret == NULL) {
3293                 return (NULL);
3294         }
3295         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3296         if (copy_init == NULL) {
3297                 sctp_m_freem(mret);
3298                 return (NULL);
3299         }
3300 #ifdef SCTP_MBUF_LOGGING
3301         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3302                 struct mbuf *mat;
3303
3304                 mat = copy_init;
3305                 while (mat) {
3306                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3307                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3308                         }
3309                         mat = SCTP_BUF_NEXT(mat);
3310                 }
3311         }
3312 #endif
3313         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3314             M_DONTWAIT);
3315         if (copy_initack == NULL) {
3316                 sctp_m_freem(mret);
3317                 sctp_m_freem(copy_init);
3318                 return (NULL);
3319         }
3320 #ifdef SCTP_MBUF_LOGGING
3321         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3322                 struct mbuf *mat;
3323
3324                 mat = copy_initack;
3325                 while (mat) {
3326                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3327                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3328                         }
3329                         mat = SCTP_BUF_NEXT(mat);
3330                 }
3331         }
3332 #endif
3333         /* easy side we just drop it on the end */
3334         ph = mtod(mret, struct sctp_paramhdr *);
3335         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3336             sizeof(struct sctp_paramhdr);
3337         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3338             sizeof(struct sctp_paramhdr));
3339         ph->param_type = htons(SCTP_STATE_COOKIE);
3340         ph->param_length = 0;   /* fill in at the end */
3341         /* Fill in the stc cookie data */
3342         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3343
3344         /* tack the INIT and then the INIT-ACK onto the chain */
3345         cookie_sz = 0;
3346         m_at = mret;
3347         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3348                 cookie_sz += SCTP_BUF_LEN(m_at);
3349                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3350                         SCTP_BUF_NEXT(m_at) = copy_init;
3351                         break;
3352                 }
3353         }
3354
3355         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3356                 cookie_sz += SCTP_BUF_LEN(m_at);
3357                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3358                         SCTP_BUF_NEXT(m_at) = copy_initack;
3359                         break;
3360                 }
3361         }
3362
3363         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3364                 cookie_sz += SCTP_BUF_LEN(m_at);
3365                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3366                         break;
3367                 }
3368         }
3369         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3370         if (sig == NULL) {
3371                 /* no space, so free the entire chain */
3372                 sctp_m_freem(mret);
3373                 return (NULL);
3374         }
3375         SCTP_BUF_LEN(sig) = 0;
3376         SCTP_BUF_NEXT(m_at) = sig;
3377         sig_offset = 0;
3378         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3379         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3380         *signature = foo;
3381         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3382         cookie_sz += SCTP_SIGNATURE_SIZE;
3383         ph->param_length = htons(cookie_sz);
3384         return (mret);
3385 }
3386
3387
3388 static uint8_t
3389 sctp_get_ect(struct sctp_tcb *stcb,
3390     struct sctp_tmit_chunk *chk)
3391 {
3392         uint8_t this_random;
3393
3394         /* Huh? */
3395         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3396                 return (0);
3397
3398         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
3399                 /* no nonce, always return ECT0 */
3400                 return (SCTP_ECT0_BIT);
3401
3402         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3403                 /* Peer does NOT support it, so we send a ECT0 only */
3404                 return (SCTP_ECT0_BIT);
3405         }
3406         if (chk == NULL)
3407                 return (SCTP_ECT0_BIT);
3408
3409         if ((stcb->asoc.hb_random_idx > 3) ||
3410             ((stcb->asoc.hb_random_idx == 3) &&
3411             (stcb->asoc.hb_ect_randombit > 7))) {
3412                 uint32_t rndval;
3413
3414 warp_drive_sa:
3415                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3416                 memcpy(stcb->asoc.hb_random_values, &rndval,
3417                     sizeof(stcb->asoc.hb_random_values));
3418                 this_random = stcb->asoc.hb_random_values[0];
3419                 stcb->asoc.hb_random_idx = 0;
3420                 stcb->asoc.hb_ect_randombit = 0;
3421         } else {
3422                 if (stcb->asoc.hb_ect_randombit > 7) {
3423                         stcb->asoc.hb_ect_randombit = 0;
3424                         stcb->asoc.hb_random_idx++;
3425                         if (stcb->asoc.hb_random_idx > 3) {
3426                                 goto warp_drive_sa;
3427                         }
3428                 }
3429                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3430         }
3431         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3432                 if (chk != NULL)
3433                         /* ECN Nonce stuff */
3434                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3435                 stcb->asoc.hb_ect_randombit++;
3436                 return (SCTP_ECT1_BIT);
3437         } else {
3438                 stcb->asoc.hb_ect_randombit++;
3439                 return (SCTP_ECT0_BIT);
3440         }
3441 }
3442
3443 static int
3444 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3445     struct sctp_tcb *stcb,      /* may be NULL */
3446     struct sctp_nets *net,
3447     struct sockaddr *to,
3448     struct mbuf *m,
3449     uint32_t auth_offset,
3450     struct sctp_auth_chunk *auth,
3451     uint16_t auth_keyid,
3452     int nofragment_flag,
3453     int ecn_ok,
3454     struct sctp_tmit_chunk *chk,
3455     int out_of_asoc_ok,
3456     uint16_t src_port,
3457     uint16_t dest_port,
3458     uint32_t v_tag,
3459     uint16_t port,
3460     int so_locked,
3461 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3462     SCTP_UNUSED
3463 #endif
3464     union sctp_sockstore *over_addr
3465 )
3466 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3467 {
3468         /*
3469          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3470          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3471          * structure: - fill in the HMAC digest of any AUTH chunk in the
3472          * packet. - calculate and fill in the SCTP checksum. - prepend an
3473          * IP address header. - if boundall use INADDR_ANY. - if
3474          * boundspecific do source address selection. - set fragmentation
3475          * option for ipV4. - On return from IP output, check/adjust mtu
3476          * size of output interface and smallest_mtu size as well.
3477          */
3478         /* Will need ifdefs around this */
3479         struct mbuf *o_pak;
3480         struct mbuf *newm;
3481         struct sctphdr *sctphdr;
3482         int packet_length;
3483         int ret;
3484         uint32_t vrf_id;
3485         sctp_route_t *ro = NULL;
3486         struct udphdr *udp = NULL;
3487
3488 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3489         struct socket *so = NULL;
3490
3491 #endif
3492
3493         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3494                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3495                 sctp_m_freem(m);
3496                 return (EFAULT);
3497         }
3498         if (stcb) {
3499                 vrf_id = stcb->asoc.vrf_id;
3500         } else {
3501                 vrf_id = inp->def_vrf_id;
3502         }
3503
3504         /* fill in the HMAC digest for any AUTH chunk in the packet */
3505         if ((auth != NULL) && (stcb != NULL)) {
3506                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3507         }
3508         if (to->sa_family == AF_INET) {
3509                 struct ip *ip = NULL;
3510                 sctp_route_t iproute;
3511                 uint8_t tos_value;
3512                 int len;
3513
3514                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3515                 if (port) {
3516                         len += sizeof(struct udphdr);
3517                 }
3518                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3519                 if (newm == NULL) {
3520                         sctp_m_freem(m);
3521                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3522                         return (ENOMEM);
3523                 }
3524                 SCTP_ALIGN_TO_END(newm, len);
3525                 SCTP_BUF_LEN(newm) = len;
3526                 SCTP_BUF_NEXT(newm) = m;
3527                 m = newm;
3528                 packet_length = sctp_calculate_len(m);
3529                 ip = mtod(m, struct ip *);
3530                 ip->ip_v = IPVERSION;
3531                 ip->ip_hl = (sizeof(struct ip) >> 2);
3532                 if (net) {
3533                         tos_value = net->tos_flowlabel & 0x000000ff;
3534                 } else {
3535                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3536                 }
3537                 if ((nofragment_flag) && (port == 0)) {
3538                         ip->ip_off = IP_DF;
3539                 } else
3540                         ip->ip_off = 0;
3541
3542                 /* FreeBSD has a function for ip_id's */
3543                 ip->ip_id = ip_newid();
3544
3545                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3546                 ip->ip_len = packet_length;
3547                 if (stcb) {
3548                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3549                                 /* Enable ECN */
3550                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3551                         } else {
3552                                 /* No ECN */
3553                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3554                         }
3555                 } else {
3556                         /* no association at all */
3557                         ip->ip_tos = (tos_value & 0xfc);
3558                 }
3559                 if (port) {
3560                         ip->ip_p = IPPROTO_UDP;
3561                 } else {
3562                         ip->ip_p = IPPROTO_SCTP;
3563                 }
3564                 ip->ip_sum = 0;
3565                 if (net == NULL) {
3566                         ro = &iproute;
3567                         memset(&iproute, 0, sizeof(iproute));
3568                         memcpy(&ro->ro_dst, to, to->sa_len);
3569                 } else {
3570                         ro = (sctp_route_t *) & net->ro;
3571                 }
3572                 /* Now the address selection part */
3573                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3574
3575                 /* call the routine to select the src address */
3576                 if (net && out_of_asoc_ok == 0) {
3577                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3578                                 sctp_free_ifa(net->ro._s_addr);
3579                                 net->ro._s_addr = NULL;
3580                                 net->src_addr_selected = 0;
3581                                 if (ro->ro_rt) {
3582                                         RTFREE(ro->ro_rt);
3583                                         ro->ro_rt = NULL;
3584                                 }
3585                         }
3586                         if (net->src_addr_selected == 0) {
3587                                 /* Cache the source address */
3588                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3589                                     ro, net, 0,
3590                                     vrf_id);
3591                                 net->src_addr_selected = 1;
3592                         }
3593                         if (net->ro._s_addr == NULL) {
3594                                 /* No route to host */
3595                                 net->src_addr_selected = 0;
3596                                 goto no_route;
3597                         }
3598                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3599                 } else {
3600                         if (over_addr == NULL) {
3601                                 struct sctp_ifa *_lsrc;
3602
3603                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3604                                     net,
3605                                     out_of_asoc_ok,
3606                                     vrf_id);
3607                                 if (_lsrc == NULL) {
3608                                         goto no_route;
3609                                 }
3610                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3611                                 sctp_free_ifa(_lsrc);
3612                         } else {
3613                                 ip->ip_src = over_addr->sin.sin_addr;
3614                                 SCTP_RTALLOC(ro, vrf_id);
3615                         }
3616                 }
3617                 if (port) {
3618                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3619                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3620                         udp->uh_dport = port;
3621                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3622                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3623                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3624                 } else {
3625                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3626                 }
3627
3628                 sctphdr->src_port = src_port;
3629                 sctphdr->dest_port = dest_port;
3630                 sctphdr->v_tag = v_tag;
3631                 sctphdr->checksum = 0;
3632
3633                 /*
3634                  * If source address selection fails and we find no route
3635                  * then the ip_output should fail as well with a
3636                  * NO_ROUTE_TO_HOST type error. We probably should catch
3637                  * that somewhere and abort the association right away
3638                  * (assuming this is an INIT being sent).
3639                  */
3640                 if ((ro->ro_rt == NULL)) {
3641                         /*
3642                          * src addr selection failed to find a route (or
3643                          * valid source addr), so we can't get there from
3644                          * here (yet)!
3645                          */
3646         no_route:
3647                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3648                             "%s: dropped packet - no valid source addr\n",
3649                             __FUNCTION__);
3650                         if (net) {
3651                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3652                                     "Destination was ");
3653                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3654                                     &net->ro._l_addr.sa);
3655                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3656                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3657                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3658                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3659                                                     stcb,
3660                                                     SCTP_FAILED_THRESHOLD,
3661                                                     (void *)net,
3662                                                     so_locked);
3663                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3664                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3665                                                 /*
3666                                                  * JRS 5/14/07 - If a
3667                                                  * destination is
3668                                                  * unreachable, the PF bit
3669                                                  * is turned off.  This
3670                                                  * allows an unambiguous use
3671                                                  * of the PF bit for
3672                                                  * destinations that are
3673                                                  * reachable but potentially
3674                                                  * failed. If the
3675                                                  * destination is set to the
3676                                                  * unreachable state, also
3677                                                  * set the destination to
3678                                                  * the PF state.
3679                                                  */
3680                                                 /*
3681                                                  * Add debug message here if
3682                                                  * destination is not in PF
3683                                                  * state.
3684                                                  */
3685                                                 /*
3686                                                  * Stop any running T3
3687                                                  * timers here?
3688                                                  */
3689                                                 if ((stcb->asoc.sctp_cmt_on_off == 1) &&
3690                                                     (stcb->asoc.sctp_cmt_pf > 0)) {
3691                                                         net->dest_state &= ~SCTP_ADDR_PF;
3692                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3693                                                             net);
3694                                                 }
3695                                         }
3696                                 }
3697                                 if (stcb) {
3698                                         if (net == stcb->asoc.primary_destination) {
3699                                                 /* need a new primary */
3700                                                 struct sctp_nets *alt;
3701
3702                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3703                                                 if (alt != net) {
3704                                                         if (sctp_set_primary_addr(stcb,
3705                                                             (struct sockaddr *)NULL,
3706                                                             alt) == 0) {
3707                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3708                                                                 if (net->ro._s_addr) {
3709                                                                         sctp_free_ifa(net->ro._s_addr);
3710                                                                         net->ro._s_addr = NULL;
3711                                                                 }
3712                                                                 net->src_addr_selected = 0;
3713                                                         }
3714                                                 }
3715                                         }
3716                                 }
3717                         }
3718                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3719                         sctp_m_freem(m);
3720                         return (EHOSTUNREACH);
3721                 }
3722                 if (ro != &iproute) {
3723                         memcpy(&iproute, ro, sizeof(*ro));
3724                 }
3725                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3726                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3727                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3728                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3729                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3730                     ro->ro_rt);
3731
3732                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3733                         /* failed to prepend data, give up */
3734                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3735                         sctp_m_freem(m);
3736                         return (ENOMEM);
3737                 }
3738 #ifdef  SCTP_PACKET_LOGGING
3739                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3740                         sctp_packet_log(m, packet_length);
3741 #endif
3742                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3743                 if (port) {
3744 #if defined(SCTP_WITH_NO_CSUM)
3745                         SCTP_STAT_INCR(sctps_sendnocrc);
3746 #else
3747                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3748                             (stcb) &&
3749                             (stcb->asoc.loopback_scope))) {
3750                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3751                                 SCTP_STAT_INCR(sctps_sendswcrc);
3752                         } else {
3753                                 SCTP_STAT_INCR(sctps_sendnocrc);
3754                         }
3755 #endif
3756                         SCTP_ENABLE_UDP_CSUM(o_pak);
3757                 } else {
3758 #if defined(SCTP_WITH_NO_CSUM)
3759                         SCTP_STAT_INCR(sctps_sendnocrc);
3760 #else
3761                         m->m_pkthdr.csum_flags = CSUM_SCTP;
3762                         m->m_pkthdr.csum_data = 0;
3763                         SCTP_STAT_INCR(sctps_sendhwcrc);
3764 #endif
3765                 }
3766                 /* send it out.  table id is taken from stcb */
3767 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3768                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3769                         so = SCTP_INP_SO(inp);
3770                         SCTP_SOCKET_UNLOCK(so, 0);
3771                 }
3772 #endif
3773                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3774 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3775                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3776                         atomic_add_int(&stcb->asoc.refcnt, 1);
3777                         SCTP_TCB_UNLOCK(stcb);
3778                         SCTP_SOCKET_LOCK(so, 0);
3779                         SCTP_TCB_LOCK(stcb);
3780                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3781                 }
3782 #endif
3783                 SCTP_STAT_INCR(sctps_sendpackets);
3784                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3785                 if (ret)
3786                         SCTP_STAT_INCR(sctps_senderrors);
3787
3788                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3789                 if (net == NULL) {
3790                         /* free tempy routes */
3791                         if (ro->ro_rt) {
3792                                 RTFREE(ro->ro_rt);
3793                                 ro->ro_rt = NULL;
3794                         }
3795                 } else {
3796                         /* PMTU check versus smallest asoc MTU goes here */
3797                         if ((ro->ro_rt != NULL) &&
3798                             (net->ro._s_addr)) {
3799                                 uint32_t mtu;
3800
3801                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3802                                 if (net->port) {
3803                                         mtu -= sizeof(struct udphdr);
3804                                 }
3805                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3806                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3807                                         net->mtu = mtu;
3808                                 }
3809                         } else if (ro->ro_rt == NULL) {
3810                                 /* route was freed */
3811                                 if (net->ro._s_addr &&
3812                                     net->src_addr_selected) {
3813                                         sctp_free_ifa(net->ro._s_addr);
3814                                         net->ro._s_addr = NULL;
3815                                 }
3816                                 net->src_addr_selected = 0;
3817                         }
3818                 }
3819                 return (ret);
3820         }
3821 #ifdef INET6
3822         else if (to->sa_family == AF_INET6) {
3823                 uint32_t flowlabel;
3824                 struct ip6_hdr *ip6h;
3825                 struct route_in6 ip6route;
3826                 struct ifnet *ifp;
3827                 u_char flowTop;
3828                 uint16_t flowBottom;
3829                 u_char tosBottom, tosTop;
3830                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3831                 int prev_scope = 0;
3832                 struct sockaddr_in6 lsa6_storage;
3833                 int error;
3834                 u_short prev_port = 0;
3835                 int len;
3836
3837                 if (net != NULL) {
3838                         flowlabel = net->tos_flowlabel;
3839                 } else {
3840                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3841                 }
3842
3843                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3844                 if (port) {
3845                         len += sizeof(struct udphdr);
3846                 }
3847                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3848                 if (newm == NULL) {
3849                         sctp_m_freem(m);
3850                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3851                         return (ENOMEM);
3852                 }
3853                 SCTP_ALIGN_TO_END(newm, len);
3854                 SCTP_BUF_LEN(newm) = len;
3855                 SCTP_BUF_NEXT(newm) = m;
3856                 m = newm;
3857                 packet_length = sctp_calculate_len(m);
3858
3859                 ip6h = mtod(m, struct ip6_hdr *);
3860                 /*
3861                  * We assume here that inp_flow is in host byte order within
3862                  * the TCB!
3863                  */
3864                 flowBottom = flowlabel & 0x0000ffff;
3865                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3866                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3867                 /* protect *sin6 from overwrite */
3868                 sin6 = (struct sockaddr_in6 *)to;
3869                 tmp = *sin6;
3870                 sin6 = &tmp;
3871
3872                 /* KAME hack: embed scopeid */
3873                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3874                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3875                         return (EINVAL);
3876                 }
3877                 if (net == NULL) {
3878                         memset(&ip6route, 0, sizeof(ip6route));
3879                         ro = (sctp_route_t *) & ip6route;
3880                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3881                 } else {
3882                         ro = (sctp_route_t *) & net->ro;
3883                 }
3884                 if (stcb != NULL) {
3885                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3886                                 /* Enable ECN */
3887                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3888                         } else {
3889                                 /* No ECN */
3890                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3891                         }
3892                 } else {
3893                         /* we could get no asoc if it is a O-O-T-B packet */
3894                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3895                 }
3896                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3897                 if (port) {
3898                         ip6h->ip6_nxt = IPPROTO_UDP;
3899                 } else {
3900                         ip6h->ip6_nxt = IPPROTO_SCTP;
3901                 }
3902                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3903                 ip6h->ip6_dst = sin6->sin6_addr;
3904
3905                 /*
3906                  * Add SRC address selection here: we can only reuse to a
3907                  * limited degree the kame src-addr-sel, since we can try
3908                  * their selection but it may not be bound.
3909                  */
3910                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3911                 lsa6_tmp.sin6_family = AF_INET6;
3912                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3913                 lsa6 = &lsa6_tmp;
3914                 if (net && out_of_asoc_ok == 0) {
3915                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3916                                 sctp_free_ifa(net->ro._s_addr);
3917                                 net->ro._s_addr = NULL;
3918                                 net->src_addr_selected = 0;
3919                                 if (ro->ro_rt) {
3920                                         RTFREE(ro->ro_rt);
3921                                         ro->ro_rt = NULL;
3922                                 }
3923                         }
3924                         if (net->src_addr_selected == 0) {
3925                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3926                                 /* KAME hack: embed scopeid */
3927                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3928                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3929                                         return (EINVAL);
3930                                 }
3931                                 /* Cache the source address */
3932                                 net->ro._s_addr = sctp_source_address_selection(inp,
3933                                     stcb,
3934                                     ro,
3935                                     net,
3936                                     0,
3937                                     vrf_id);
3938                                 (void)sa6_recoverscope(sin6);
3939                                 net->src_addr_selected = 1;
3940                         }
3941                         if (net->ro._s_addr == NULL) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3943                                 net->src_addr_selected = 0;
3944                                 goto no_route;
3945                         }
3946                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3947                 } else {
3948                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3949                         /* KAME hack: embed scopeid */
3950                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3951                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3952                                 return (EINVAL);
3953                         }
3954                         if (over_addr == NULL) {
3955                                 struct sctp_ifa *_lsrc;
3956
3957                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3958                                     net,
3959                                     out_of_asoc_ok,
3960                                     vrf_id);
3961                                 if (_lsrc == NULL) {
3962                                         goto no_route;
3963                                 }
3964                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3965                                 sctp_free_ifa(_lsrc);
3966                         } else {
3967                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3968                                 SCTP_RTALLOC(ro, vrf_id);
3969                         }
3970                         (void)sa6_recoverscope(sin6);
3971                 }
3972                 lsa6->sin6_port = inp->sctp_lport;
3973
3974                 if (ro->ro_rt == NULL) {
3975                         /*
3976                          * src addr selection failed to find a route (or
3977                          * valid source addr), so we can't get there from
3978                          * here!
3979                          */
3980                         goto no_route;
3981                 }
3982                 /*
3983                  * XXX: sa6 may not have a valid sin6_scope_id in the
3984                  * non-SCOPEDROUTING case.
3985                  */
3986                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3987                 lsa6_storage.sin6_family = AF_INET6;
3988                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3989                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3990                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3991                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3992                         sctp_m_freem(m);
3993                         return (error);
3994                 }
3995                 /* XXX */
3996                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3997                 lsa6_storage.sin6_port = inp->sctp_lport;
3998                 lsa6 = &lsa6_storage;
3999                 ip6h->ip6_src = lsa6->sin6_addr;
4000
4001                 if (port) {
4002                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4003                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4004                         udp->uh_dport = port;
4005                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4006                         udp->uh_sum = 0;
4007                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4008                 } else {
4009                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4010                 }
4011
4012                 sctphdr->src_port = src_port;
4013                 sctphdr->dest_port = dest_port;
4014                 sctphdr->v_tag = v_tag;
4015                 sctphdr->checksum = 0;
4016
4017                 /*
4018                  * We set the hop limit now since there is a good chance
4019                  * that our ro pointer is now filled
4020                  */
4021                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4022                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4023
4024 #ifdef SCTP_DEBUG
4025                 /* Copy to be sure something bad is not happening */
4026                 sin6->sin6_addr = ip6h->ip6_dst;
4027                 lsa6->sin6_addr = ip6h->ip6_src;
4028 #endif
4029
4030                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4031                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4032                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4033                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4034                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4035                 if (net) {
4036                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4037                         /* preserve the port and scope for link local send */
4038                         prev_scope = sin6->sin6_scope_id;
4039                         prev_port = sin6->sin6_port;
4040                 }
4041                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4042                         /* failed to prepend data, give up */
4043                         sctp_m_freem(m);
4044                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4045                         return (ENOMEM);
4046                 }
4047 #ifdef  SCTP_PACKET_LOGGING
4048                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4049                         sctp_packet_log(m, packet_length);
4050 #endif
4051                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4052                 if (port) {
4053 #if defined(SCTP_WITH_NO_CSUM)
4054                         SCTP_STAT_INCR(sctps_sendnocrc);
4055 #else
4056                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4057                             (stcb) &&
4058                             (stcb->asoc.loopback_scope))) {
4059                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4060                                 SCTP_STAT_INCR(sctps_sendswcrc);
4061                         } else {
4062                                 SCTP_STAT_INCR(sctps_sendnocrc);
4063                         }
4064 #endif
4065                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4066                                 udp->uh_sum = 0xffff;
4067                         }
4068                 } else {
4069 #if defined(SCTP_WITH_NO_CSUM)
4070                         SCTP_STAT_INCR(sctps_sendnocrc);
4071 #else
4072                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4073                             (stcb) &&
4074                             (stcb->asoc.loopback_scope))) {
4075                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4076                                 m->m_pkthdr.csum_data = 0;
4077                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4078                         } else {
4079                                 SCTP_STAT_INCR(sctps_sendnocrc);
4080                         }
4081 #endif
4082                 }
4083                 /* send it out. table id is taken from stcb */
4084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4085                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4086                         so = SCTP_INP_SO(inp);
4087                         SCTP_SOCKET_UNLOCK(so, 0);
4088                 }
4089 #endif
4090                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4091 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4092                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4093                         atomic_add_int(&stcb->asoc.refcnt, 1);
4094                         SCTP_TCB_UNLOCK(stcb);
4095                         SCTP_SOCKET_LOCK(so, 0);
4096                         SCTP_TCB_LOCK(stcb);
4097                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4098                 }
4099 #endif
4100                 if (net) {
4101                         /* for link local this must be done */
4102                         sin6->sin6_scope_id = prev_scope;
4103                         sin6->sin6_port = prev_port;
4104                 }
4105                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4106                 SCTP_STAT_INCR(sctps_sendpackets);
4107                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4108                 if (ret) {
4109                         SCTP_STAT_INCR(sctps_senderrors);
4110                 }
4111                 if (net == NULL) {
4112                         /* Now if we had a temp route free it */
4113                         if (ro->ro_rt) {
4114                                 RTFREE(ro->ro_rt);
4115                         }
4116                 } else {
4117                         /* PMTU check versus smallest asoc MTU goes here */
4118                         if (ro->ro_rt == NULL) {
4119                                 /* Route was freed */
4120                                 if (net->ro._s_addr &&
4121                                     net->src_addr_selected) {
4122                                         sctp_free_ifa(net->ro._s_addr);
4123                                         net->ro._s_addr = NULL;
4124                                 }
4125                                 net->src_addr_selected = 0;
4126                         }
4127                         if ((ro->ro_rt != NULL) &&
4128                             (net->ro._s_addr)) {
4129                                 uint32_t mtu;
4130
4131                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4132                                 if (mtu &&
4133                                     (stcb->asoc.smallest_mtu > mtu)) {
4134                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4135                                         net->mtu = mtu;
4136                                         if (net->port) {
4137                                                 net->mtu -= sizeof(struct udphdr);
4138                                         }
4139                                 }
4140                         } else if (ifp) {
4141                                 if (ND_IFINFO(ifp)->linkmtu &&
4142                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4143                                         sctp_mtu_size_reset(inp,
4144                                             &stcb->asoc,
4145                                             ND_IFINFO(ifp)->linkmtu);
4146                                 }
4147                         }
4148                 }
4149                 return (ret);
4150         }
4151 #endif
4152         else {
4153                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4154                     ((struct sockaddr *)to)->sa_family);
4155                 sctp_m_freem(m);
4156                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4157                 return (EFAULT);
4158         }
4159 }
4160
4161
4162 void
4163 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4164 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4165     SCTP_UNUSED
4166 #endif
4167 )
4168 {
4169         struct mbuf *m, *m_at, *mp_last;
4170         struct sctp_nets *net;
4171         struct sctp_init_chunk *init;
4172         struct sctp_supported_addr_param *sup_addr;
4173         struct sctp_adaptation_layer_indication *ali;
4174         struct sctp_ecn_supported_param *ecn;
4175         struct sctp_prsctp_supported_param *prsctp;
4176         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4177         struct sctp_supported_chunk_types_param *pr_supported;
4178         int cnt_inits_to = 0;
4179         int padval, ret;
4180         int num_ext;
4181         int p_len;
4182
4183         /* INIT's always go to the primary (and usually ONLY address) */
4184         mp_last = NULL;
4185         net = stcb->asoc.primary_destination;
4186         if (net == NULL) {
4187                 net = TAILQ_FIRST(&stcb->asoc.nets);
4188                 if (net == NULL) {
4189                         /* TSNH */
4190                         return;
4191                 }
4192                 /* we confirm any address we send an INIT to */
4193                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4194                 (void)sctp_set_primary_addr(stcb, NULL, net);
4195         } else {
4196                 /* we confirm any address we send an INIT to */
4197                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4198         }
4199         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4200 #ifdef INET6
4201         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4202                 /*
4203                  * special hook, if we are sending to link local it will not
4204                  * show up in our private address count.
4205                  */
4206                 struct sockaddr_in6 *sin6l;
4207
4208                 sin6l = &net->ro._l_addr.sin6;
4209                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4210                         cnt_inits_to = 1;
4211         }
4212 #endif
4213         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4214                 /* This case should not happen */
4215                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4216                 return;
4217         }
4218         /* start the INIT timer */
4219         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4220
4221         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4222         if (m == NULL) {
4223                 /* No memory, INIT timer will re-attempt. */
4224                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4225                 return;
4226         }
4227         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4228         /*
4229          * assume peer supports asconf in order to be able to queue local
4230          * address changes while an INIT is in flight and before the assoc
4231          * is established.
4232          */
4233         stcb->asoc.peer_supports_asconf = 1;
4234         /* Now lets put the SCTP header in place */
4235         init = mtod(m, struct sctp_init_chunk *);
4236         /* now the chunk header */
4237         init->ch.chunk_type = SCTP_INITIATION;
4238         init->ch.chunk_flags = 0;
4239         /* fill in later from mbuf we build */
4240         init->ch.chunk_length = 0;
4241         /* place in my tag */
4242         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4243         /* set up some of the credits. */
4244         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4245             SCTP_MINIMAL_RWND));
4246
4247         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4248         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4249         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4250         /* now the address restriction */
4251         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4252             sizeof(*init));
4253         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4254 #ifdef INET6
4255         /* we support 2 types: IPv6/IPv4 */
4256         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4257         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4258         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4259 #else
4260         /* we support 1 type: IPv4 */
4261         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4262         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4263         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4264 #endif
4265         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4266         /* adaptation layer indication parameter */
4267         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4268         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4269         ali->ph.param_length = htons(sizeof(*ali));
4270         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4271         SCTP_BUF_LEN(m) += sizeof(*ali);
4272         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4273
4274         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4275                 /* Add NAT friendly parameter */
4276                 struct sctp_paramhdr *ph;
4277
4278                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4279                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4280                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4281                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4282                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4283         }
4284         /* now any cookie time extensions */
4285         if (stcb->asoc.cookie_preserve_req) {
4286                 struct sctp_cookie_perserve_param *cookie_preserve;
4287
4288                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4289                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4290                 cookie_preserve->ph.param_length = htons(
4291                     sizeof(*cookie_preserve));
4292                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4293                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4294                 ecn = (struct sctp_ecn_supported_param *)(
4295                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4296                 stcb->asoc.cookie_preserve_req = 0;
4297         }
4298         /* ECN parameter */
4299         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4300                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4301                 ecn->ph.param_length = htons(sizeof(*ecn));
4302                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4303                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4304                     sizeof(*ecn));
4305         } else {
4306                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4307         }
4308         /* And now tell the peer we do pr-sctp */
4309         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4310         prsctp->ph.param_length = htons(sizeof(*prsctp));
4311         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4312
4313         /* And now tell the peer we do all the extensions */
4314         pr_supported = (struct sctp_supported_chunk_types_param *)
4315             ((caddr_t)prsctp + sizeof(*prsctp));
4316         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4317         num_ext = 0;
4318         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4319         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4320         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4321         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4322         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4323         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4324                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4325         }
4326         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4327                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4328         }
4329         p_len = sizeof(*pr_supported) + num_ext;
4330         pr_supported->ph.param_length = htons(p_len);
4331         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4332         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4333
4334
4335         /* ECN nonce: And now tell the peer we support ECN nonce */
4336         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4337                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4338                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4339                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4340                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4341                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4342         }
4343         /* add authentication parameters */
4344         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4345                 struct sctp_auth_random *randp;
4346                 struct sctp_auth_hmac_algo *hmacs;
4347                 struct sctp_auth_chunk_list *chunks;
4348
4349                 /* attach RANDOM parameter, if available */
4350                 if (stcb->asoc.authinfo.random != NULL) {
4351                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4352                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4353                         /* random key already contains the header */
4354                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4355                         /* zero out any padding required */
4356                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4357                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4358                 }
4359                 /* add HMAC_ALGO parameter */
4360                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4361                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4362                     (uint8_t *) hmacs->hmac_ids);
4363                 if (p_len > 0) {
4364                         p_len += sizeof(*hmacs);
4365                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4366                         hmacs->ph.param_length = htons(p_len);
4367                         /* zero out any padding required */
4368                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4369                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4370                 }
4371                 /* add CHUNKS parameter */
4372                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4373                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4374                     chunks->chunk_types);
4375                 if (p_len > 0) {
4376                         p_len += sizeof(*chunks);
4377                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4378                         chunks->ph.param_length = htons(p_len);
4379                         /* zero out any padding required */
4380                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4381                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4382                 }
4383         }
4384         m_at = m;
4385         /* now the addresses */
4386         {
4387                 struct sctp_scoping scp;
4388
4389                 /*
4390                  * To optimize this we could put the scoping stuff into a
4391                  * structure and remove the individual uint8's from the
4392                  * assoc structure. Then we could just sifa in the address
4393                  * within the stcb.. but for now this is a quick hack to get
4394                  * the address stuff teased apart.
4395                  */
4396                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4397                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4398                 scp.loopback_scope = stcb->asoc.loopback_scope;
4399                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4400                 scp.local_scope = stcb->asoc.local_scope;
4401                 scp.site_scope = stcb->asoc.site_scope;
4402
4403                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4404         }
4405
4406         /* calulate the size and update pkt header and chunk header */
4407         p_len = 0;
4408         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4409                 if (SCTP_BUF_NEXT(m_at) == NULL)
4410                         mp_last = m_at;
4411                 p_len += SCTP_BUF_LEN(m_at);
4412         }
4413         init->ch.chunk_length = htons(p_len);
4414         /*
4415          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4416          * here since the timer will drive a retranmission.
4417          */
4418
4419         /* I don't expect this to execute but we will be safe here */
4420         padval = p_len % 4;
4421         if ((padval) && (mp_last)) {
4422                 /*
4423                  * The compiler worries that mp_last may not be set even
4424                  * though I think it is impossible :-> however we add
4425                  * mp_last here just in case.
4426                  */
4427                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4428                 if (ret) {
4429                         /* Houston we have a problem, no space */
4430                         sctp_m_freem(m);
4431                         return;
4432                 }
4433                 p_len += padval;
4434         }
4435         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4436         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4437             (struct sockaddr *)&net->ro._l_addr,
4438             m, 0, NULL, 0, 0, 0, NULL, 0,
4439             inp->sctp_lport, stcb->rport, htonl(0),
4440             net->port, so_locked, NULL);
4441         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4442         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4443         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4444 }
4445
4446 struct mbuf *
4447 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4448     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4449 {
4450         /*
4451          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4452          * being equal to the beginning of the params i.e. (iphlen +
4453          * sizeof(struct sctp_init_msg) parse through the parameters to the
4454          * end of the mbuf verifying that all parameters are known.
4455          *
4456          * For unknown parameters build and return a mbuf with
4457          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4458          * processing this chunk stop, and set *abort_processing to 1.
4459          *
4460          * By having param_offset be pre-set to where parameters begin it is
4461          * hoped that this routine may be reused in the future by new
4462          * features.
4463          */
4464         struct sctp_paramhdr *phdr, params;
4465
4466         struct mbuf *mat, *op_err;
4467         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4468         int at, limit, pad_needed;
4469         uint16_t ptype, plen, padded_size;
4470         int err_at;
4471
4472         *abort_processing = 0;
4473         mat = in_initpkt;
4474         err_at = 0;
4475         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4476         at = param_offset;
4477         op_err = NULL;
4478         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4479         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4480         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4481                 ptype = ntohs(phdr->param_type);
4482                 plen = ntohs(phdr->param_length);
4483                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4484                         /* wacked parameter */
4485                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4486                         goto invalid_size;
4487                 }
4488                 limit -= SCTP_SIZE32(plen);
4489                 /*-
4490                  * All parameters for all chunks that we know/understand are
4491                  * listed here. We process them other places and make
4492                  * appropriate stop actions per the upper bits. However this
4493                  * is the generic routine processor's can call to get back
4494                  * an operr.. to either incorporate (init-ack) or send.
4495                  */
4496                 padded_size = SCTP_SIZE32(plen);
4497                 switch (ptype) {
4498                         /* Param's with variable size */
4499                 case SCTP_HEARTBEAT_INFO:
4500                 case SCTP_STATE_COOKIE:
4501                 case SCTP_UNRECOG_PARAM:
4502                 case SCTP_ERROR_CAUSE_IND:
4503                         /* ok skip fwd */
4504                         at += padded_size;
4505                         break;
4506                         /* Param's with variable size within a range */
4507                 case SCTP_CHUNK_LIST:
4508                 case SCTP_SUPPORTED_CHUNK_EXT:
4509                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4510                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4511                                 goto invalid_size;
4512                         }
4513                         at += padded_size;
4514                         break;
4515                 case SCTP_SUPPORTED_ADDRTYPE:
4516                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4517                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4518                                 goto invalid_size;
4519                         }
4520                         at += padded_size;
4521                         break;
4522                 case SCTP_RANDOM:
4523                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4524                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4525                                 goto invalid_size;
4526                         }
4527                         at += padded_size;
4528                         break;
4529                 case SCTP_SET_PRIM_ADDR:
4530                 case SCTP_DEL_IP_ADDRESS:
4531                 case SCTP_ADD_IP_ADDRESS:
4532                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4533                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4534                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4535                                 goto invalid_size;
4536                         }
4537                         at += padded_size;
4538                         break;
4539                         /* Param's with a fixed size */
4540                 case SCTP_IPV4_ADDRESS:
4541                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4542                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4543                                 goto invalid_size;
4544                         }
4545                         at += padded_size;
4546                         break;
4547                 case SCTP_IPV6_ADDRESS:
4548                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4549                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4550                                 goto invalid_size;
4551                         }
4552                         at += padded_size;
4553                         break;
4554                 case SCTP_COOKIE_PRESERVE:
4555                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4556                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4557                                 goto invalid_size;
4558                         }
4559                         at += padded_size;
4560                         break;
4561                 case SCTP_HAS_NAT_SUPPORT:
4562                         *nat_friendly = 1;
4563                         /* fall through */
4564                 case SCTP_ECN_NONCE_SUPPORTED:
4565                 case SCTP_PRSCTP_SUPPORTED:
4566
4567                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4568                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4569                                 goto invalid_size;
4570                         }
4571                         at += padded_size;
4572                         break;
4573                 case SCTP_ECN_CAPABLE:
4574                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4575                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4576                                 goto invalid_size;
4577                         }
4578                         at += padded_size;
4579                         break;
4580                 case SCTP_ULP_ADAPTATION:
4581                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4582                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4583                                 goto invalid_size;
4584                         }
4585                         at += padded_size;
4586                         break;
4587                 case SCTP_SUCCESS_REPORT:
4588                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4589                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4590                                 goto invalid_size;
4591                         }
4592                         at += padded_size;
4593                         break;
4594                 case SCTP_HOSTNAME_ADDRESS:
4595                         {
4596                                 /* We can NOT handle HOST NAME addresses!! */
4597                                 int l_len;
4598
4599                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4600                                 *abort_processing = 1;
4601                                 if (op_err == NULL) {
4602                                         /* Ok need to try to get a mbuf */
4603 #ifdef INET6
4604                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4605 #else
4606                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4607 #endif
4608                                         l_len += plen;
4609                                         l_len += sizeof(struct sctp_paramhdr);
4610                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4611                                         if (op_err) {
4612                                                 SCTP_BUF_LEN(op_err) = 0;
4613                                                 /*
4614                                                  * pre-reserve space for ip
4615                                                  * and sctp header  and
4616                                                  * chunk hdr
4617                                                  */
4618 #ifdef INET6
4619                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4620 #else
4621                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4622 #endif
4623                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4624                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4625                                         }
4626                                 }
4627                                 if (op_err) {
4628                                         /* If we have space */
4629                                         struct sctp_paramhdr s;
4630
4631                                         if (err_at % 4) {
4632                                                 uint32_t cpthis = 0;
4633
4634                                                 pad_needed = 4 - (err_at % 4);
4635                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4636                                                 err_at += pad_needed;
4637                                         }
4638                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4639                                         s.param_length = htons(sizeof(s) + plen);
4640                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4641                                         err_at += sizeof(s);
4642                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4643                                         if (phdr == NULL) {
4644                                                 sctp_m_freem(op_err);
4645                                                 /*
4646                                                  * we are out of memory but
4647                                                  * we still need to have a
4648                                                  * look at what to do (the
4649                                                  * system is in trouble
4650                                                  * though).
4651                                                  */
4652                                                 return (NULL);
4653                                         }
4654                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4655                                         err_at += plen;
4656                                 }
4657                                 return (op_err);
4658                                 break;
4659                         }
4660                 default:
4661                         /*
4662                          * we do not recognize the parameter figure out what
4663                          * we do.
4664                          */
4665                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4666                         if ((ptype & 0x4000) == 0x4000) {
4667                                 /* Report bit is set?? */
4668                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4669                                 if (op_err == NULL) {
4670                                         int l_len;
4671
4672                                         /* Ok need to try to get an mbuf */
4673 #ifdef INET6
4674                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4675 #else
4676                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4677 #endif
4678                                         l_len += plen;
4679                                         l_len += sizeof(struct sctp_paramhdr);
4680                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4681                                         if (op_err) {
4682                                                 SCTP_BUF_LEN(op_err) = 0;
4683 #ifdef INET6
4684                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4685 #else
4686                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4687 #endif
4688                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4689                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4690                                         }
4691                                 }
4692                                 if (op_err) {
4693                                         /* If we have space */
4694                                         struct sctp_paramhdr s;
4695
4696                                         if (err_at % 4) {
4697                                                 uint32_t cpthis = 0;
4698
4699                                                 pad_needed = 4 - (err_at % 4);
4700                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4701                                                 err_at += pad_needed;
4702                                         }
4703                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4704                                         s.param_length = htons(sizeof(s) + plen);
4705                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4706                                         err_at += sizeof(s);
4707                                         if (plen > sizeof(tempbuf)) {
4708                                                 plen = sizeof(tempbuf);
4709                                         }
4710                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4711                                         if (phdr == NULL) {
4712                                                 sctp_m_freem(op_err);
4713                                                 /*
4714                                                  * we are out of memory but
4715                                                  * we still need to have a
4716                                                  * look at what to do (the
4717                                                  * system is in trouble
4718                                                  * though).
4719                                                  */
4720                                                 op_err = NULL;
4721                                                 goto more_processing;
4722                                         }
4723                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4724                                         err_at += plen;
4725                                 }
4726                         }
4727         more_processing:
4728                         if ((ptype & 0x8000) == 0x0000) {
4729                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4730                                 return (op_err);
4731                         } else {
4732                                 /* skip this chunk and continue processing */
4733                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4734                                 at += SCTP_SIZE32(plen);
4735                         }
4736                         break;
4737
4738                 }
4739                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4740         }
4741         return (op_err);
4742 invalid_size:
4743         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4744         *abort_processing = 1;
4745         if ((op_err == NULL) && phdr) {
4746                 int l_len;
4747
4748 #ifdef INET6
4749                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4750 #else
4751                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4752 #endif
4753                 l_len += (2 * sizeof(struct sctp_paramhdr));
4754                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4755                 if (op_err) {
4756                         SCTP_BUF_LEN(op_err) = 0;
4757 #ifdef INET6
4758                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4759 #else
4760                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4761 #endif
4762                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4763                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4764                 }
4765         }
4766         if ((op_err) && phdr) {
4767                 struct sctp_paramhdr s;
4768
4769                 if (err_at % 4) {
4770                         uint32_t cpthis = 0;
4771
4772                         pad_needed = 4 - (err_at % 4);
4773                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4774                         err_at += pad_needed;
4775                 }
4776                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4777                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4778                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4779                 err_at += sizeof(s);
4780                 /* Only copy back the p-hdr that caused the issue */
4781                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4782         }
4783         return (op_err);
4784 }
4785
4786 static int
4787 sctp_are_there_new_addresses(struct sctp_association *asoc,
4788     struct mbuf *in_initpkt, int iphlen, int offset)
4789 {
4790         /*
4791          * Given a INIT packet, look through the packet to verify that there
4792          * are NO new addresses. As we go through the parameters add reports
4793          * of any un-understood parameters that require an error.  Also we
4794          * must return (1) to drop the packet if we see a un-understood
4795          * parameter that tells us to drop the chunk.
4796          */
4797         struct sockaddr_in sin4, *sa4;
4798
4799 #ifdef INET6
4800         struct sockaddr_in6 sin6, *sa6;
4801
4802 #endif
4803         struct sockaddr *sa_touse;
4804         struct sockaddr *sa;
4805         struct sctp_paramhdr *phdr, params;
4806         struct ip *iph;
4807
4808 #ifdef INET6
4809         struct ip6_hdr *ip6h;
4810
4811 #endif
4812         struct mbuf *mat;
4813         uint16_t ptype, plen;
4814         int err_at;
4815         uint8_t fnd;
4816         struct sctp_nets *net;
4817
4818         memset(&sin4, 0, sizeof(sin4));
4819 #ifdef INET6
4820         memset(&sin6, 0, sizeof(sin6));
4821 #endif
4822         sin4.sin_family = AF_INET;
4823         sin4.sin_len = sizeof(sin4);
4824 #ifdef INET6
4825         sin6.sin6_family = AF_INET6;
4826         sin6.sin6_len = sizeof(sin6);
4827 #endif
4828         sa_touse = NULL;
4829         /* First what about the src address of the pkt ? */
4830         iph = mtod(in_initpkt, struct ip *);
4831         switch (iph->ip_v) {
4832         case IPVERSION:
4833                 /* source addr is IPv4 */
4834                 sin4.sin_addr = iph->ip_src;
4835                 sa_touse = (struct sockaddr *)&sin4;
4836                 break;
4837 #ifdef INET6
4838         case IPV6_VERSION >> 4:
4839                 /* source addr is IPv6 */
4840                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4841                 sin6.sin6_addr = ip6h->ip6_src;
4842                 sa_touse = (struct sockaddr *)&sin6;
4843                 break;
4844 #endif
4845         default:
4846                 return (1);
4847         }
4848
4849         fnd = 0;
4850         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4851                 sa = (struct sockaddr *)&net->ro._l_addr;
4852                 if (sa->sa_family == sa_touse->sa_family) {
4853                         if (sa->sa_family == AF_INET) {
4854                                 sa4 = (struct sockaddr_in *)sa;
4855                                 if (sa4->sin_addr.s_addr ==
4856                                     sin4.sin_addr.s_addr) {
4857                                         fnd = 1;
4858                                         break;
4859                                 }
4860                         }
4861 #ifdef INET6
4862                         if (sa->sa_family == AF_INET6) {
4863                                 sa6 = (struct sockaddr_in6 *)sa;
4864                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4865                                     &sin6)) {
4866                                         fnd = 1;
4867                                         break;
4868                                 }
4869                         }
4870 #endif
4871                 }
4872         }
4873         if (fnd == 0) {
4874                 /* New address added! no need to look futher. */
4875                 return (1);
4876         }
4877         /* Ok so far lets munge through the rest of the packet */
4878         mat = in_initpkt;
4879         err_at = 0;
4880         sa_touse = NULL;
4881         offset += sizeof(struct sctp_init_chunk);
4882         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4883         while (phdr) {
4884                 ptype = ntohs(phdr->param_type);
4885                 plen = ntohs(phdr->param_length);
4886                 if (ptype == SCTP_IPV4_ADDRESS) {
4887                         struct sctp_ipv4addr_param *p4, p4_buf;
4888
4889                         phdr = sctp_get_next_param(mat, offset,
4890                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4891                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4892                             phdr == NULL) {
4893                                 return (1);
4894                         }
4895                         p4 = (struct sctp_ipv4addr_param *)phdr;
4896                         sin4.sin_addr.s_addr = p4->addr;
4897                         sa_touse = (struct sockaddr *)&sin4;
4898                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4899                         struct sctp_ipv6addr_param *p6, p6_buf;
4900
4901                         phdr = sctp_get_next_param(mat, offset,
4902                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4903                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4904                             phdr == NULL) {
4905                                 return (1);
4906                         }
4907                         p6 = (struct sctp_ipv6addr_param *)phdr;
4908 #ifdef INET6
4909                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4910                             sizeof(p6->addr));
4911 #endif
4912                         sa_touse = (struct sockaddr *)&sin4;
4913                 }
4914                 if (sa_touse) {
4915                         /* ok, sa_touse points to one to check */
4916                         fnd = 0;
4917                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4918                                 sa = (struct sockaddr *)&net->ro._l_addr;
4919                                 if (sa->sa_family != sa_touse->sa_family) {
4920                                         continue;
4921                                 }
4922                                 if (sa->sa_family == AF_INET) {
4923                                         sa4 = (struct sockaddr_in *)sa;
4924                                         if (sa4->sin_addr.s_addr ==
4925                                             sin4.sin_addr.s_addr) {
4926                                                 fnd = 1;
4927                                                 break;
4928                                         }
4929                                 }
4930 #ifdef INET6
4931                                 if (sa->sa_family == AF_INET6) {
4932                                         sa6 = (struct sockaddr_in6 *)sa;
4933                                         if (SCTP6_ARE_ADDR_EQUAL(
4934                                             sa6, &sin6)) {
4935                                                 fnd = 1;
4936                                                 break;
4937                                         }
4938                                 }
4939 #endif
4940                         }
4941                         if (!fnd) {
4942                                 /* New addr added! no need to look further */
4943                                 return (1);
4944                         }
4945                 }
4946                 offset += SCTP_SIZE32(plen);
4947                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4948         }
4949         return (0);
4950 }
4951
4952 /*
4953  * Given a MBUF chain that was sent into us containing an INIT. Build a
4954  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4955  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4956  * message (i.e. the struct sctp_init_msg).
4957  */
4958 void
4959 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4960     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4961     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4962 {
4963         struct sctp_association *asoc;
4964         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4965         struct sctp_init_ack_chunk *initack;
4966         struct sctp_adaptation_layer_indication *ali;
4967         struct sctp_ecn_supported_param *ecn;
4968         struct sctp_prsctp_supported_param *prsctp;
4969         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4970         struct sctp_supported_chunk_types_param *pr_supported;
4971         union sctp_sockstore store, store1, *over_addr;
4972         struct sockaddr_in *sin, *to_sin;
4973
4974 #ifdef INET6
4975         struct sockaddr_in6 *sin6, *to_sin6;
4976
4977 #endif
4978         struct ip *iph;
4979
4980 #ifdef INET6
4981         struct ip6_hdr *ip6;
4982
4983 #endif
4984         struct sockaddr *to;
4985         struct sctp_state_cookie stc;
4986         struct sctp_nets *net = NULL;
4987         uint8_t *signature = NULL;
4988         int cnt_inits_to = 0;
4989         uint16_t his_limit, i_want;
4990         int abort_flag, padval;
4991         int num_ext;
4992         int p_len;
4993         int nat_friendly = 0;
4994         struct socket *so;
4995
4996         if (stcb)
4997                 asoc = &stcb->asoc;
4998         else
4999                 asoc = NULL;
5000         mp_last = NULL;
5001         if ((asoc != NULL) &&
5002             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5003             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
5004                 /* new addresses, out of here in non-cookie-wait states */
5005                 /*
5006                  * Send a ABORT, we don't add the new address error clause
5007                  * though we even set the T bit and copy in the 0 tag.. this
5008                  * looks no different than if no listener was present.
5009                  */
5010                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5011                 return;
5012         }
5013         abort_flag = 0;
5014         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5015             (offset + sizeof(struct sctp_init_chunk)),
5016             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5017         if (abort_flag) {
5018 do_a_abort:
5019                 sctp_send_abort(init_pkt, iphlen, sh,
5020                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5021                 return;
5022         }
5023         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5024         if (m == NULL) {
5025                 /* No memory, INIT timer will re-attempt. */
5026                 if (op_err)
5027                         sctp_m_freem(op_err);
5028                 return;
5029         }
5030         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5031
5032         /* the time I built cookie */
5033         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5034
5035         /* populate any tie tags */
5036         if (asoc != NULL) {
5037                 /* unlock before tag selections */
5038                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5039                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5040                 stc.cookie_life = asoc->cookie_life;
5041                 net = asoc->primary_destination;
5042         } else {
5043                 stc.tie_tag_my_vtag = 0;
5044                 stc.tie_tag_peer_vtag = 0;
5045                 /* life I will award this cookie */
5046                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5047         }
5048
5049         /* copy in the ports for later check */
5050         stc.myport = sh->dest_port;
5051         stc.peerport = sh->src_port;
5052
5053         /*
5054          * If we wanted to honor cookie life extentions, we would add to
5055          * stc.cookie_life. For now we should NOT honor any extension
5056          */
5057         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5058         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5059                 struct inpcb *in_inp;
5060
5061                 /* Its a V6 socket */
5062                 in_inp = (struct inpcb *)inp;
5063                 stc.ipv6_addr_legal = 1;
5064                 /* Now look at the binding flag to see if V4 will be legal */
5065                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5066                         stc.ipv4_addr_legal = 1;
5067                 } else {
5068                         /* V4 addresses are NOT legal on the association */
5069                         stc.ipv4_addr_legal = 0;
5070                 }
5071         } else {
5072                 /* Its a V4 socket, no - V6 */
5073                 stc.ipv4_addr_legal = 1;
5074                 stc.ipv6_addr_legal = 0;
5075         }
5076
5077 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5078         stc.ipv4_scope = 1;
5079 #else
5080         stc.ipv4_scope = 0;
5081 #endif
5082         /* now for scope setup */
5083         memset((caddr_t)&store, 0, sizeof(store));
5084         memset((caddr_t)&store1, 0, sizeof(store1));
5085         sin = &store.sin;
5086         to_sin = &store1.sin;
5087 #ifdef INET6
5088         sin6 = &store.sin6;
5089         to_sin6 = &store1.sin6;
5090 #endif
5091         iph = mtod(init_pkt, struct ip *);
5092         /* establish the to_addr's */
5093         switch (iph->ip_v) {
5094         case IPVERSION:
5095                 to_sin->sin_port = sh->dest_port;
5096                 to_sin->sin_family = AF_INET;
5097                 to_sin->sin_len = sizeof(struct sockaddr_in);
5098                 to_sin->sin_addr = iph->ip_dst;
5099                 break;
5100 #ifdef INET6
5101         case IPV6_VERSION >> 4:
5102                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5103                 to_sin6->sin6_addr = ip6->ip6_dst;
5104                 to_sin6->sin6_scope_id = 0;
5105                 to_sin6->sin6_port = sh->dest_port;
5106                 to_sin6->sin6_family = AF_INET6;
5107                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5108                 break;
5109 #endif
5110         default:
5111                 goto do_a_abort;
5112                 break;
5113         };
5114
5115         if (net == NULL) {
5116                 to = (struct sockaddr *)&store;
5117                 switch (iph->ip_v) {
5118                 case IPVERSION:
5119                         {
5120                                 sin->sin_family = AF_INET;
5121                                 sin->sin_len = sizeof(struct sockaddr_in);
5122                                 sin->sin_port = sh->src_port;
5123                                 sin->sin_addr = iph->ip_src;
5124                                 /* lookup address */
5125                                 stc.address[0] = sin->sin_addr.s_addr;
5126                                 stc.address[1] = 0;
5127                                 stc.address[2] = 0;
5128                                 stc.address[3] = 0;
5129                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5130                                 /* local from address */
5131                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5132                                 stc.laddress[1] = 0;
5133                                 stc.laddress[2] = 0;
5134                                 stc.laddress[3] = 0;
5135                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5136                                 /* scope_id is only for v6 */
5137                                 stc.scope_id = 0;
5138 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5139                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5140                                         stc.ipv4_scope = 1;
5141                                 }
5142 #else
5143                                 stc.ipv4_scope = 1;
5144 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5145                                 /* Must use the address in this case */
5146                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5147                                         stc.loopback_scope = 1;
5148                                         stc.ipv4_scope = 1;
5149                                         stc.site_scope = 1;
5150                                         stc.local_scope = 0;
5151                                 }
5152                                 break;
5153                         }
5154 #ifdef INET6
5155                 case IPV6_VERSION >> 4:
5156                         {
5157                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5158                                 sin6->sin6_family = AF_INET6;
5159                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5160                                 sin6->sin6_port = sh->src_port;
5161                                 sin6->sin6_addr = ip6->ip6_src;
5162                                 /* lookup address */
5163                                 memcpy(&stc.address, &sin6->sin6_addr,
5164                                     sizeof(struct in6_addr));
5165                                 sin6->sin6_scope_id = 0;
5166                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5167                                 stc.scope_id = 0;
5168                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5169                                         /*
5170                                          * FIX ME: does this have scope from
5171                                          * rcvif?
5172                                          */
5173                                         (void)sa6_recoverscope(sin6);
5174                                         stc.scope_id = sin6->sin6_scope_id;
5175                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5176                                         stc.loopback_scope = 1;
5177                                         stc.local_scope = 0;
5178                                         stc.site_scope = 1;
5179                                         stc.ipv4_scope = 1;
5180                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5181                                         /*
5182                                          * If the new destination is a
5183                                          * LINK_LOCAL we must have common
5184                                          * both site and local scope. Don't
5185                                          * set local scope though since we
5186                                          * must depend on the source to be
5187                                          * added implicitly. We cannot
5188                                          * assure just because we share one
5189                                          * link that all links are common.
5190                                          */
5191                                         stc.local_scope = 0;
5192                                         stc.site_scope = 1;
5193                                         stc.ipv4_scope = 1;
5194                                         /*
5195                                          * we start counting for the private
5196                                          * address stuff at 1. since the
5197                                          * link local we source from won't
5198                                          * show up in our scoped count.
5199                                          */
5200                                         cnt_inits_to = 1;
5201                                         /*
5202                                          * pull out the scope_id from
5203                                          * incoming pkt
5204                                          */
5205                                         /*
5206                                          * FIX ME: does this have scope from
5207                                          * rcvif?
5208                                          */
5209                                         (void)sa6_recoverscope(sin6);
5210                                         stc.scope_id = sin6->sin6_scope_id;
5211                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5212                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5213                                         /*
5214                                          * If the new destination is
5215                                          * SITE_LOCAL then we must have site
5216                                          * scope in common.
5217                                          */
5218                                         stc.site_scope = 1;
5219                                 }
5220                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5221                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5222                                 break;
5223                         }
5224 #endif
5225                 default:
5226                         /* TSNH */
5227                         goto do_a_abort;
5228                         break;
5229                 }
5230         } else {
5231                 /* set the scope per the existing tcb */
5232
5233 #ifdef INET6
5234                 struct sctp_nets *lnet;
5235
5236 #endif
5237
5238                 stc.loopback_scope = asoc->loopback_scope;
5239                 stc.ipv4_scope = asoc->ipv4_local_scope;
5240                 stc.site_scope = asoc->site_scope;
5241                 stc.local_scope = asoc->local_scope;
5242 #ifdef INET6
5243                 /* Why do we not consider IPv4 LL addresses? */
5244                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5245                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5246                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5247                                         /*
5248                                          * if we have a LL address, start
5249                                          * counting at 1.
5250                                          */
5251                                         cnt_inits_to = 1;
5252                                 }
5253                         }
5254                 }
5255 #endif
5256                 /* use the net pointer */
5257                 to = (struct sockaddr *)&net->ro._l_addr;
5258                 switch (to->sa_family) {
5259                 case AF_INET:
5260                         sin = (struct sockaddr_in *)to;
5261                         stc.address[0] = sin->sin_addr.s_addr;
5262                         stc.address[1] = 0;
5263                         stc.address[2] = 0;
5264                         stc.address[3] = 0;
5265                         stc.addr_type = SCTP_IPV4_ADDRESS;
5266                         if (net->src_addr_selected == 0) {
5267                                 /*
5268                                  * strange case here, the INIT should have
5269                                  * did the selection.
5270                                  */
5271                                 net->ro._s_addr = sctp_source_address_selection(inp,
5272                                     stcb, (sctp_route_t *) & net->ro,
5273                                     net, 0, vrf_id);
5274                                 if (net->ro._s_addr == NULL)
5275                                         return;
5276
5277                                 net->src_addr_selected = 1;
5278
5279                         }
5280                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5281                         stc.laddress[1] = 0;
5282                         stc.laddress[2] = 0;
5283                         stc.laddress[3] = 0;
5284                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5285                         break;
5286 #ifdef INET6
5287                 case AF_INET6:
5288                         sin6 = (struct sockaddr_in6 *)to;
5289                         memcpy(&stc.address, &sin6->sin6_addr,
5290                             sizeof(struct in6_addr));
5291                         stc.addr_type = SCTP_IPV6_ADDRESS;
5292                         if (net->src_addr_selected == 0) {
5293                                 /*
5294                                  * strange case here, the INIT should have
5295                                  * did the selection.
5296                                  */
5297                                 net->ro._s_addr = sctp_source_address_selection(inp,
5298                                     stcb, (sctp_route_t *) & net->ro,
5299                                     net, 0, vrf_id);
5300                                 if (net->ro._s_addr == NULL)
5301                                         return;
5302
5303                                 net->src_addr_selected = 1;
5304                         }
5305                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5306                             sizeof(struct in6_addr));
5307                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5308                         break;
5309 #endif
5310                 }
5311         }
5312         /* Now lets put the SCTP header in place */
5313         initack = mtod(m, struct sctp_init_ack_chunk *);
5314         /* Save it off for quick ref */
5315         stc.peers_vtag = init_chk->init.initiate_tag;
5316         /* who are we */
5317         memcpy(stc.identification, SCTP_VERSION_STRING,
5318             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5319         /* now the chunk header */
5320         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5321         initack->ch.chunk_flags = 0;
5322         /* fill in later from mbuf we build */
5323         initack->ch.chunk_length = 0;
5324         /* place in my tag */
5325         if ((asoc != NULL) &&
5326             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5327             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5328             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5329                 /* re-use the v-tags and init-seq here */
5330                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5331                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5332         } else {
5333                 uint32_t vtag, itsn;
5334
5335                 if (hold_inp_lock) {
5336                         SCTP_INP_INCR_REF(inp);
5337                         SCTP_INP_RUNLOCK(inp);
5338                 }
5339                 if (asoc) {
5340                         atomic_add_int(&asoc->refcnt, 1);
5341                         SCTP_TCB_UNLOCK(stcb);
5342         new_tag:
5343                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5344                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5345                                 /*
5346                                  * Got a duplicate vtag on some guy behind a
5347                                  * nat make sure we don't use it.
5348                                  */
5349                                 goto new_tag;
5350                         }
5351                         initack->init.initiate_tag = htonl(vtag);
5352                         /* get a TSN to use too */
5353                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5354                         initack->init.initial_tsn = htonl(itsn);
5355                         SCTP_TCB_LOCK(stcb);
5356                         atomic_add_int(&asoc->refcnt, -1);
5357                 } else {
5358                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5359                         initack->init.initiate_tag = htonl(vtag);
5360                         /* get a TSN to use too */
5361                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5362                 }
5363                 if (hold_inp_lock) {
5364                         SCTP_INP_RLOCK(inp);
5365                         SCTP_INP_DECR_REF(inp);
5366                 }
5367         }
5368         /* save away my tag to */
5369         stc.my_vtag = initack->init.initiate_tag;
5370
5371         /* set up some of the credits. */
5372         so = inp->sctp_socket;
5373         if (so == NULL) {
5374                 /* memory problem */
5375                 sctp_m_freem(m);
5376                 return;
5377         } else {
5378                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5379         }
5380         /* set what I want */
5381         his_limit = ntohs(init_chk->init.num_inbound_streams);
5382         /* choose what I want */
5383         if (asoc != NULL) {
5384                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5385                         i_want = asoc->streamoutcnt;
5386                 } else {
5387                         i_want = inp->sctp_ep.pre_open_stream_count;
5388                 }
5389         } else {
5390                 i_want = inp->sctp_ep.pre_open_stream_count;
5391         }
5392         if (his_limit < i_want) {
5393                 /* I Want more :< */
5394                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5395         } else {
5396                 /* I can have what I want :> */
5397                 initack->init.num_outbound_streams = htons(i_want);
5398         }
5399         /* tell him his limt. */
5400         initack->init.num_inbound_streams =
5401             htons(inp->sctp_ep.max_open_streams_intome);
5402
5403         /* adaptation layer indication parameter */
5404         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5405         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5406         ali->ph.param_length = htons(sizeof(*ali));
5407         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5408         SCTP_BUF_LEN(m) += sizeof(*ali);
5409         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5410
5411         /* ECN parameter */
5412         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5413                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5414                 ecn->ph.param_length = htons(sizeof(*ecn));
5415                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5416
5417                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5418                     sizeof(*ecn));
5419         } else {
5420                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5421         }
5422         /* And now tell the peer we do  pr-sctp */
5423         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5424         prsctp->ph.param_length = htons(sizeof(*prsctp));
5425         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5426         if (nat_friendly) {
5427                 /* Add NAT friendly parameter */
5428                 struct sctp_paramhdr *ph;
5429
5430                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5431                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5432                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5433                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5434         }
5435         /* And now tell the peer we do all the extensions */
5436         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5437         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5438         num_ext = 0;
5439         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5440         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5441         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5442         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5443         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5444         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5445                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5446         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5447                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5448         p_len = sizeof(*pr_supported) + num_ext;
5449         pr_supported->ph.param_length = htons(p_len);
5450         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5451         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5452
5453         /* ECN nonce: And now tell the peer we support ECN nonce */
5454         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5455                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5456                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5457                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5458                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5459                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5460         }
5461         /* add authentication parameters */
5462         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5463                 struct sctp_auth_random *randp;
5464                 struct sctp_auth_hmac_algo *hmacs;
5465                 struct sctp_auth_chunk_list *chunks;
5466                 uint16_t random_len;
5467
5468                 /* generate and add RANDOM parameter */
5469                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5470                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5471                 randp->ph.param_type = htons(SCTP_RANDOM);
5472                 p_len = sizeof(*randp) + random_len;
5473                 randp->ph.param_length = htons(p_len);
5474                 SCTP_READ_RANDOM(randp->random_data, random_len);
5475                 /* zero out any padding required */
5476                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5477                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5478
5479                 /* add HMAC_ALGO parameter */
5480                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5481                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5482                     (uint8_t *) hmacs->hmac_ids);
5483                 if (p_len > 0) {
5484                         p_len += sizeof(*hmacs);
5485                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5486                         hmacs->ph.param_length = htons(p_len);
5487                         /* zero out any padding required */
5488                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5489                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5490                 }
5491                 /* add CHUNKS parameter */
5492                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5493                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5494                     chunks->chunk_types);
5495                 if (p_len > 0) {
5496                         p_len += sizeof(*chunks);
5497                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5498                         chunks->ph.param_length = htons(p_len);
5499                         /* zero out any padding required */
5500                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5501                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5502                 }
5503         }
5504         m_at = m;
5505         /* now the addresses */
5506         {
5507                 struct sctp_scoping scp;
5508
5509                 /*
5510                  * To optimize this we could put the scoping stuff into a
5511                  * structure and remove the individual uint8's from the stc
5512                  * structure. Then we could just sifa in the address within
5513                  * the stc.. but for now this is a quick hack to get the
5514                  * address stuff teased apart.
5515                  */
5516                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5517                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5518                 scp.loopback_scope = stc.loopback_scope;
5519                 scp.ipv4_local_scope = stc.ipv4_scope;
5520                 scp.local_scope = stc.local_scope;
5521                 scp.site_scope = stc.site_scope;
5522                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5523         }
5524
5525         /* tack on the operational error if present */
5526         if (op_err) {
5527                 struct mbuf *ol;
5528                 int llen;
5529
5530                 llen = 0;
5531                 ol = op_err;
5532                 while (ol) {
5533                         llen += SCTP_BUF_LEN(ol);
5534                         ol = SCTP_BUF_NEXT(ol);
5535                 }
5536                 if (llen % 4) {
5537                         /* must add a pad to the param */
5538                         uint32_t cpthis = 0;
5539                         int padlen;
5540
5541                         padlen = 4 - (llen % 4);
5542                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5543                 }
5544                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5545                         m_at = SCTP_BUF_NEXT(m_at);
5546                 }
5547                 SCTP_BUF_NEXT(m_at) = op_err;
5548                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5549                         m_at = SCTP_BUF_NEXT(m_at);
5550                 }
5551         }
5552         /* pre-calulate the size and update pkt header and chunk header */
5553         p_len = 0;
5554         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5555                 p_len += SCTP_BUF_LEN(m_tmp);
5556                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5557                         /* m_tmp should now point to last one */
5558                         break;
5559                 }
5560         }
5561
5562         /* Now we must build a cookie */
5563         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5564         if (m_cookie == NULL) {
5565                 /* memory problem */
5566                 sctp_m_freem(m);
5567                 return;
5568         }
5569         /* Now append the cookie to the end and update the space/size */
5570         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5571
5572         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5573                 p_len += SCTP_BUF_LEN(m_tmp);
5574                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5575                         /* m_tmp should now point to last one */
5576                         mp_last = m_tmp;
5577                         break;
5578                 }
5579         }
5580         /*
5581          * Place in the size, but we don't include the last pad (if any) in
5582          * the INIT-ACK.
5583          */
5584         initack->ch.chunk_length = htons(p_len);
5585
5586         /*
5587          * Time to sign the cookie, we don't sign over the cookie signature
5588          * though thus we set trailer.
5589          */
5590         (void)sctp_hmac_m(SCTP_HMAC,
5591             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5592             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5593             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5594         /*
5595          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5596          * here since the timer will drive a retranmission.
5597          */
5598         padval = p_len % 4;
5599         if ((padval) && (mp_last)) {
5600                 /* see my previous comments on mp_last */
5601                 int ret;
5602
5603                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5604                 if (ret) {
5605                         /* Houston we have a problem, no space */
5606                         sctp_m_freem(m);
5607                         return;
5608                 }
5609                 p_len += padval;
5610         }
5611         if (stc.loopback_scope) {
5612                 over_addr = &store1;
5613         } else {
5614                 over_addr = NULL;
5615         }
5616
5617         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5618             0, NULL, 0,
5619             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5620             port, SCTP_SO_NOT_LOCKED, over_addr);
5621         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5622 }
5623
5624
5625 void
5626 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5627     struct sctp_association *asoc,
5628     struct sctp_stream_out *strq, int holds_lock)
5629 {
5630         if (holds_lock == 0) {
5631                 SCTP_TCB_SEND_LOCK(stcb);
5632         }
5633         if ((strq->next_spoke.tqe_next == NULL) &&
5634             (strq->next_spoke.tqe_prev == NULL)) {
5635                 TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5636         }
5637         if (holds_lock == 0) {
5638                 SCTP_TCB_SEND_UNLOCK(stcb);
5639         }
5640 }
5641
5642 void
5643 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5644     struct sctp_association *asoc,
5645     struct sctp_stream_out *strq,
5646     int holds_lock)
5647 {
5648         /* take off and then setup so we know it is not on the wheel */
5649         if (holds_lock == 0) {
5650                 SCTP_TCB_SEND_LOCK(stcb);
5651         }
5652         if (TAILQ_EMPTY(&strq->outqueue)) {
5653                 if (asoc->last_out_stream == strq) {
5654                         asoc->last_out_stream = TAILQ_PREV(asoc->last_out_stream, sctpwheel_listhead, next_spoke);
5655                         if (asoc->last_out_stream == NULL) {
5656                                 asoc->last_out_stream = TAILQ_LAST(&asoc->out_wheel, sctpwheel_listhead);
5657                         }
5658                         if (asoc->last_out_stream == strq) {
5659                                 asoc->last_out_stream = NULL;
5660                         }
5661                 }
5662                 TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5663                 strq->next_spoke.tqe_next = NULL;
5664                 strq->next_spoke.tqe_prev = NULL;
5665         }
5666         if (holds_lock == 0) {
5667                 SCTP_TCB_SEND_UNLOCK(stcb);
5668         }
5669 }
5670
5671 static void
5672 sctp_prune_prsctp(struct sctp_tcb *stcb,
5673     struct sctp_association *asoc,
5674     struct sctp_sndrcvinfo *srcv,
5675     int dataout)
5676 {
5677         int freed_spc = 0;
5678         struct sctp_tmit_chunk *chk, *nchk;
5679
5680         SCTP_TCB_LOCK_ASSERT(stcb);
5681         if ((asoc->peer_supports_prsctp) &&
5682             (asoc->sent_queue_cnt_removeable > 0)) {
5683                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5684                         /*
5685                          * Look for chunks marked with the PR_SCTP flag AND
5686                          * the buffer space flag. If the one being sent is
5687                          * equal or greater priority then purge the old one
5688                          * and free some space.
5689                          */
5690                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5691                                 /*
5692                                  * This one is PR-SCTP AND buffer space
5693                                  * limited type
5694                                  */
5695                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5696                                         /*
5697                                          * Lower numbers equates to higher
5698                                          * priority so if the one we are
5699                                          * looking at has a larger or equal
5700                                          * priority we want to drop the data
5701                                          * and NOT retransmit it.
5702                                          */
5703                                         if (chk->data) {
5704                                                 /*
5705                                                  * We release the book_size
5706                                                  * if the mbuf is here
5707                                                  */
5708                                                 int ret_spc;
5709                                                 int cause;
5710
5711                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5712                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5713                                                 else
5714                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5715                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5716                                                     cause,
5717                                                     SCTP_SO_LOCKED);
5718                                                 freed_spc += ret_spc;
5719                                                 if (freed_spc >= dataout) {
5720                                                         return;
5721                                                 }
5722                                         }       /* if chunk was present */
5723                                 }       /* if of sufficent priority */
5724                         }       /* if chunk has enabled */
5725                 }               /* tailqforeach */
5726
5727                 chk = TAILQ_FIRST(&asoc->send_queue);
5728                 while (chk) {
5729                         nchk = TAILQ_NEXT(chk, sctp_next);
5730                         /* Here we must move to the sent queue and mark */
5731                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5732                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5733                                         if (chk->data) {
5734                                                 /*
5735                                                  * We release the book_size
5736                                                  * if the mbuf is here
5737                                                  */
5738                                                 int ret_spc;
5739
5740                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5741                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5742                                                     SCTP_SO_LOCKED);
5743
5744                                                 freed_spc += ret_spc;
5745                                                 if (freed_spc >= dataout) {
5746                                                         return;
5747                                                 }
5748                                         }       /* end if chk->data */
5749                                 }       /* end if right class */
5750                         }       /* end if chk pr-sctp */
5751                         chk = nchk;
5752                 }               /* end while (chk) */
5753         }                       /* if enabled in asoc */
5754 }
5755
5756 int
5757 sctp_get_frag_point(struct sctp_tcb *stcb,
5758     struct sctp_association *asoc)
5759 {
5760         int siz, ovh;
5761
5762         /*
5763          * For endpoints that have both v6 and v4 addresses we must reserve
5764          * room for the ipv6 header, for those that are only dealing with V4
5765          * we use a larger frag point.
5766          */
5767         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5768                 ovh = SCTP_MED_OVERHEAD;
5769         } else {
5770                 ovh = SCTP_MED_V4_OVERHEAD;
5771         }
5772
5773         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5774                 siz = asoc->smallest_mtu - ovh;
5775         else
5776                 siz = (stcb->asoc.sctp_frag_point - ovh);
5777         /*
5778          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5779          */
5780         /* A data chunk MUST fit in a cluster */
5781         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5782         /* } */
5783
5784         /* adjust for an AUTH chunk if DATA requires auth */
5785         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5786                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5787
5788         if (siz % 4) {
5789                 /* make it an even word boundary please */
5790                 siz -= (siz % 4);
5791         }
5792         return (siz);
5793 }
5794
5795 static void
5796 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5797 {
5798         sp->pr_sctp_on = 0;
5799         /*
5800          * We assume that the user wants PR_SCTP_TTL if the user provides a
5801          * positive lifetime but does not specify any PR_SCTP policy. This
5802          * is a BAD assumption and causes problems at least with the
5803          * U-Vancovers MPI folks. I will change this to be no policy means
5804          * NO PR-SCTP.
5805          */
5806         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5807                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5808                 sp->pr_sctp_on = 1;
5809         } else {
5810                 return;
5811         }
5812         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5813         case CHUNK_FLAGS_PR_SCTP_BUF:
5814                 /*
5815                  * Time to live is a priority stored in tv_sec when doing
5816                  * the buffer drop thing.
5817                  */
5818                 sp->ts.tv_sec = sp->timetolive;
5819                 sp->ts.tv_usec = 0;
5820                 break;
5821         case CHUNK_FLAGS_PR_SCTP_TTL:
5822                 {
5823                         struct timeval tv;
5824
5825                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5826                         tv.tv_sec = sp->timetolive / 1000;
5827                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5828                         /*
5829                          * TODO sctp_constants.h needs alternative time
5830                          * macros when _KERNEL is undefined.
5831                          */
5832                         timevaladd(&sp->ts, &tv);
5833                 }
5834                 break;
5835         case CHUNK_FLAGS_PR_SCTP_RTX:
5836                 /*
5837                  * Time to live is a the number or retransmissions stored in
5838                  * tv_sec.
5839                  */
5840                 sp->ts.tv_sec = sp->timetolive;
5841                 sp->ts.tv_usec = 0;
5842                 break;
5843         default:
5844                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5845                     "Unknown PR_SCTP policy %u.\n",
5846                     PR_SCTP_POLICY(sp->sinfo_flags));
5847                 break;
5848         }
5849 }
5850
5851 static int
5852 sctp_msg_append(struct sctp_tcb *stcb,
5853     struct sctp_nets *net,
5854     struct mbuf *m,
5855     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5856 {
5857         int error = 0, holds_lock;
5858         struct mbuf *at;
5859         struct sctp_stream_queue_pending *sp = NULL;
5860         struct sctp_stream_out *strm;
5861
5862         /*
5863          * Given an mbuf chain, put it into the association send queue and
5864          * place it on the wheel
5865          */
5866         holds_lock = hold_stcb_lock;
5867         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5868                 /* Invalid stream number */
5869                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5870                 error = EINVAL;
5871                 goto out_now;
5872         }
5873         if ((stcb->asoc.stream_locked) &&
5874             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5875                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5876                 error = EINVAL;
5877                 goto out_now;
5878         }
5879         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5880         /* Now can we send this? */
5881         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5882             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5883             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5884             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5885                 /* got data while shutting down */
5886                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5887                 error = ECONNRESET;
5888                 goto out_now;
5889         }
5890         sctp_alloc_a_strmoq(stcb, sp);
5891         if (sp == NULL) {
5892                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5893                 error = ENOMEM;
5894                 goto out_now;
5895         }
5896         sp->sinfo_flags = srcv->sinfo_flags;
5897         sp->timetolive = srcv->sinfo_timetolive;
5898         sp->ppid = srcv->sinfo_ppid;
5899         sp->context = srcv->sinfo_context;
5900         sp->strseq = 0;
5901         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5902                 sp->net = net;
5903                 atomic_add_int(&sp->net->ref_count, 1);
5904         } else {
5905                 sp->net = NULL;
5906         }
5907         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5908         sp->stream = srcv->sinfo_stream;
5909         sp->msg_is_complete = 1;
5910         sp->sender_all_done = 1;
5911         sp->some_taken = 0;
5912         sp->data = m;
5913         sp->tail_mbuf = NULL;
5914         sp->length = 0;
5915         at = m;
5916         sctp_set_prsctp_policy(sp);
5917         /*
5918          * We could in theory (for sendall) sifa the length in, but we would
5919          * still have to hunt through the chain since we need to setup the
5920          * tail_mbuf
5921          */
5922         while (at) {
5923                 if (SCTP_BUF_NEXT(at) == NULL)
5924                         sp->tail_mbuf = at;
5925                 sp->length += SCTP_BUF_LEN(at);
5926                 at = SCTP_BUF_NEXT(at);
5927         }
5928         SCTP_TCB_SEND_LOCK(stcb);
5929         sctp_snd_sb_alloc(stcb, sp->length);
5930         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5931         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5932         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5933                 sp->strseq = strm->next_sequence_sent;
5934                 strm->next_sequence_sent++;
5935         }
5936         if ((strm->next_spoke.tqe_next == NULL) &&
5937             (strm->next_spoke.tqe_prev == NULL)) {
5938                 /* Not on wheel, insert */
5939                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5940         }
5941         m = NULL;
5942         SCTP_TCB_SEND_UNLOCK(stcb);
5943 out_now:
5944         if (m) {
5945                 sctp_m_freem(m);
5946         }
5947         return (error);
5948 }
5949
5950
5951 static struct mbuf *
5952 sctp_copy_mbufchain(struct mbuf *clonechain,
5953     struct mbuf *outchain,
5954     struct mbuf **endofchain,
5955     int can_take_mbuf,
5956     int sizeofcpy,
5957     uint8_t copy_by_ref)
5958 {
5959         struct mbuf *m;
5960         struct mbuf *appendchain;
5961         caddr_t cp;
5962         int len;
5963
5964         if (endofchain == NULL) {
5965                 /* error */
5966 error_out:
5967                 if (outchain)
5968                         sctp_m_freem(outchain);
5969                 return (NULL);
5970         }
5971         if (can_take_mbuf) {
5972                 appendchain = clonechain;
5973         } else {
5974                 if (!copy_by_ref &&
5975                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5976                     ) {
5977                         /* Its not in a cluster */
5978                         if (*endofchain == NULL) {
5979                                 /* lets get a mbuf cluster */
5980                                 if (outchain == NULL) {
5981                                         /* This is the general case */
5982                         new_mbuf:
5983                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5984                                         if (outchain == NULL) {
5985                                                 goto error_out;
5986                                         }
5987                                         SCTP_BUF_LEN(outchain) = 0;
5988                                         *endofchain = outchain;
5989                                         /* get the prepend space */
5990                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5991                                 } else {
5992                                         /*
5993                                          * We really should not get a NULL
5994                                          * in endofchain
5995                                          */
5996                                         /* find end */
5997                                         m = outchain;
5998                                         while (m) {
5999                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6000                                                         *endofchain = m;
6001                                                         break;
6002                                                 }
6003                                                 m = SCTP_BUF_NEXT(m);
6004                                         }
6005                                         /* sanity */
6006                                         if (*endofchain == NULL) {
6007                                                 /*
6008                                                  * huh, TSNH XXX maybe we
6009                                                  * should panic
6010                                                  */
6011                                                 sctp_m_freem(outchain);
6012                                                 goto new_mbuf;
6013                                         }
6014                                 }
6015                                 /* get the new end of length */
6016                                 len = M_TRAILINGSPACE(*endofchain);
6017                         } else {
6018                                 /* how much is left at the end? */
6019                                 len = M_TRAILINGSPACE(*endofchain);
6020                         }
6021                         /* Find the end of the data, for appending */
6022                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6023
6024                         /* Now lets copy it out */
6025                         if (len >= sizeofcpy) {
6026                                 /* It all fits, copy it in */
6027                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6028                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6029                         } else {
6030                                 /* fill up the end of the chain */
6031                                 if (len > 0) {
6032                                         m_copydata(clonechain, 0, len, cp);
6033                                         SCTP_BUF_LEN((*endofchain)) += len;
6034                                         /* now we need another one */
6035                                         sizeofcpy -= len;
6036                                 }
6037                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6038                                 if (m == NULL) {
6039                                         /* We failed */
6040                                         goto error_out;
6041                                 }
6042                                 SCTP_BUF_NEXT((*endofchain)) = m;
6043                                 *endofchain = m;
6044                                 cp = mtod((*endofchain), caddr_t);
6045                                 m_copydata(clonechain, len, sizeofcpy, cp);
6046                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6047                         }
6048                         return (outchain);
6049                 } else {
6050                         /* copy the old fashion way */
6051                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6052 #ifdef SCTP_MBUF_LOGGING
6053                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6054                                 struct mbuf *mat;
6055
6056                                 mat = appendchain;
6057                                 while (mat) {
6058                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6059                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6060                                         }
6061                                         mat = SCTP_BUF_NEXT(mat);
6062                                 }
6063                         }
6064 #endif
6065                 }
6066         }
6067         if (appendchain == NULL) {
6068                 /* error */
6069                 if (outchain)
6070                         sctp_m_freem(outchain);
6071                 return (NULL);
6072         }
6073         if (outchain) {
6074                 /* tack on to the end */
6075                 if (*endofchain != NULL) {
6076                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6077                 } else {
6078                         m = outchain;
6079                         while (m) {
6080                                 if (SCTP_BUF_NEXT(m) == NULL) {
6081                                         SCTP_BUF_NEXT(m) = appendchain;
6082                                         break;
6083                                 }
6084                                 m = SCTP_BUF_NEXT(m);
6085                         }
6086                 }
6087                 /*
6088                  * save off the end and update the end-chain postion
6089                  */
6090                 m = appendchain;
6091                 while (m) {
6092                         if (SCTP_BUF_NEXT(m) == NULL) {
6093                                 *endofchain = m;
6094                                 break;
6095                         }
6096                         m = SCTP_BUF_NEXT(m);
6097                 }
6098                 return (outchain);
6099         } else {
6100                 /* save off the end and update the end-chain postion */
6101                 m = appendchain;
6102                 while (m) {
6103                         if (SCTP_BUF_NEXT(m) == NULL) {
6104                                 *endofchain = m;
6105                                 break;
6106                         }
6107                         m = SCTP_BUF_NEXT(m);
6108                 }
6109                 return (appendchain);
6110         }
6111 }
6112
6113 int
6114 sctp_med_chunk_output(struct sctp_inpcb *inp,
6115     struct sctp_tcb *stcb,
6116     struct sctp_association *asoc,
6117     int *num_out,
6118     int *reason_code,
6119     int control_only, int from_where,
6120     struct timeval *now, int *now_filled, int frag_point, int so_locked
6121 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6122     SCTP_UNUSED
6123 #endif
6124 );
6125
6126 static void
6127 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6128     uint32_t val)
6129 {
6130         struct sctp_copy_all *ca;
6131         struct mbuf *m;
6132         int ret = 0;
6133         int added_control = 0;
6134         int un_sent, do_chunk_output = 1;
6135         struct sctp_association *asoc;
6136
6137         ca = (struct sctp_copy_all *)ptr;
6138         if (ca->m == NULL) {
6139                 return;
6140         }
6141         if (ca->inp != inp) {
6142                 /* TSNH */
6143                 return;
6144         }
6145         if ((ca->m) && ca->sndlen) {
6146                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6147                 if (m == NULL) {
6148                         /* can't copy so we are done */
6149                         ca->cnt_failed++;
6150                         return;
6151                 }
6152 #ifdef SCTP_MBUF_LOGGING
6153                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6154                         struct mbuf *mat;
6155
6156                         mat = m;
6157                         while (mat) {
6158                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6159                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6160                                 }
6161                                 mat = SCTP_BUF_NEXT(mat);
6162                         }
6163                 }
6164 #endif
6165         } else {
6166                 m = NULL;
6167         }
6168         SCTP_TCB_LOCK_ASSERT(stcb);
6169         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6170                 /* Abort this assoc with m as the user defined reason */
6171                 if (m) {
6172                         struct sctp_paramhdr *ph;
6173
6174                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6175                         if (m) {
6176                                 ph = mtod(m, struct sctp_paramhdr *);
6177                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6178                                 ph->param_length = htons(ca->sndlen);
6179                         }
6180                         /*
6181                          * We add one here to keep the assoc from
6182                          * dis-appearing on us.
6183                          */
6184                         atomic_add_int(&stcb->asoc.refcnt, 1);
6185                         sctp_abort_an_association(inp, stcb,
6186                             SCTP_RESPONSE_TO_USER_REQ,
6187                             m, SCTP_SO_NOT_LOCKED);
6188                         /*
6189                          * sctp_abort_an_association calls sctp_free_asoc()
6190                          * free association will NOT free it since we
6191                          * incremented the refcnt .. we do this to prevent
6192                          * it being freed and things getting tricky since we
6193                          * could end up (from free_asoc) calling inpcb_free
6194                          * which would get a recursive lock call to the
6195                          * iterator lock.. But as a consequence of that the
6196                          * stcb will return to us un-locked.. since
6197                          * free_asoc returns with either no TCB or the TCB
6198                          * unlocked, we must relock.. to unlock in the
6199                          * iterator timer :-0
6200                          */
6201                         SCTP_TCB_LOCK(stcb);
6202                         atomic_add_int(&stcb->asoc.refcnt, -1);
6203                         goto no_chunk_output;
6204                 }
6205         } else {
6206                 if (m) {
6207                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6208                             &ca->sndrcv, 1);
6209                 }
6210                 asoc = &stcb->asoc;
6211                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6212                         /* shutdown this assoc */
6213                         int cnt;
6214
6215                         cnt = sctp_is_there_unsent_data(stcb);
6216
6217                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6218                             TAILQ_EMPTY(&asoc->sent_queue) &&
6219                             (cnt == 0)) {
6220                                 if (asoc->locked_on_sending) {
6221                                         goto abort_anyway;
6222                                 }
6223                                 /*
6224                                  * there is nothing queued to send, so I'm
6225                                  * done...
6226                                  */
6227                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6228                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6229                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6230                                         /*
6231                                          * only send SHUTDOWN the first time
6232                                          * through
6233                                          */
6234                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6235                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6236                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6237                                         }
6238                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6239                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6240                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6241                                             asoc->primary_destination);
6242                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6243                                             asoc->primary_destination);
6244                                         added_control = 1;
6245                                         do_chunk_output = 0;
6246                                 }
6247                         } else {
6248                                 /*
6249                                  * we still got (or just got) data to send,
6250                                  * so set SHUTDOWN_PENDING
6251                                  */
6252                                 /*
6253                                  * XXX sockets draft says that SCTP_EOF
6254                                  * should be sent with no data.  currently,
6255                                  * we will allow user data to be sent first
6256                                  * and move to SHUTDOWN-PENDING
6257                                  */
6258                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6259                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6260                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6261                                         if (asoc->locked_on_sending) {
6262                                                 /*
6263                                                  * Locked to send out the
6264                                                  * data
6265                                                  */
6266                                                 struct sctp_stream_queue_pending *sp;
6267
6268                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6269                                                 if (sp) {
6270                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6271                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6272                                                 }
6273                                         }
6274                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6275                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6276                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6277                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6278                                 abort_anyway:
6279                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6280                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6281                                                     SCTP_RESPONSE_TO_USER_REQ,
6282                                                     NULL, SCTP_SO_NOT_LOCKED);
6283                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6284                                                 goto no_chunk_output;
6285                                         }
6286                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6287                                             asoc->primary_destination);
6288                                 }
6289                         }
6290
6291                 }
6292         }
6293         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6294             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6295
6296         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6297             (stcb->asoc.total_flight > 0) &&
6298             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6299             ) {
6300                 do_chunk_output = 0;
6301         }
6302         if (do_chunk_output)
6303                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6304         else if (added_control) {
6305                 int num_out = 0, reason = 0, now_filled = 0;
6306                 struct timeval now;
6307                 int frag_point;
6308
6309                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6310                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6311                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6312         }
6313 no_chunk_output:
6314         if (ret) {
6315                 ca->cnt_failed++;
6316         } else {
6317                 ca->cnt_sent++;
6318         }
6319 }
6320
6321 static void
6322 sctp_sendall_completes(void *ptr, uint32_t val)
6323 {
6324         struct sctp_copy_all *ca;
6325
6326         ca = (struct sctp_copy_all *)ptr;
6327         /*
6328          * Do a notify here? Kacheong suggests that the notify be done at
6329          * the send time.. so you would push up a notification if any send
6330          * failed. Don't know if this is feasable since the only failures we
6331          * have is "memory" related and if you cannot get an mbuf to send
6332          * the data you surely can't get an mbuf to send up to notify the
6333          * user you can't send the data :->
6334          */
6335
6336         /* now free everything */
6337         sctp_m_freem(ca->m);
6338         SCTP_FREE(ca, SCTP_M_COPYAL);
6339 }
6340
6341
6342 #define MC_ALIGN(m, len) do {                                           \
6343         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6344 } while (0)
6345
6346
6347
6348 static struct mbuf *
6349 sctp_copy_out_all(struct uio *uio, int len)
6350 {
6351         struct mbuf *ret, *at;
6352         int left, willcpy, cancpy, error;
6353
6354         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6355         if (ret == NULL) {
6356                 /* TSNH */
6357                 return (NULL);
6358         }
6359         left = len;
6360         SCTP_BUF_LEN(ret) = 0;
6361         /* save space for the data chunk header */
6362         cancpy = M_TRAILINGSPACE(ret);
6363         willcpy = min(cancpy, left);
6364         at = ret;
6365         while (left > 0) {
6366                 /* Align data to the end */
6367                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6368                 if (error) {
6369         err_out_now:
6370                         sctp_m_freem(at);
6371                         return (NULL);
6372                 }
6373                 SCTP_BUF_LEN(at) = willcpy;
6374                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6375                 left -= willcpy;
6376                 if (left > 0) {
6377                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6378                         if (SCTP_BUF_NEXT(at) == NULL) {
6379                                 goto err_out_now;
6380                         }
6381                         at = SCTP_BUF_NEXT(at);
6382                         SCTP_BUF_LEN(at) = 0;
6383                         cancpy = M_TRAILINGSPACE(at);
6384                         willcpy = min(cancpy, left);
6385                 }
6386         }
6387         return (ret);
6388 }
6389
6390 static int
6391 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6392     struct sctp_sndrcvinfo *srcv)
6393 {
6394         int ret;
6395         struct sctp_copy_all *ca;
6396
6397         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6398             SCTP_M_COPYAL);
6399         if (ca == NULL) {
6400                 sctp_m_freem(m);
6401                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6402                 return (ENOMEM);
6403         }
6404         memset(ca, 0, sizeof(struct sctp_copy_all));
6405
6406         ca->inp = inp;
6407         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6408         /*
6409          * take off the sendall flag, it would be bad if we failed to do
6410          * this :-0
6411          */
6412         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6413         /* get length and mbuf chain */
6414         if (uio) {
6415                 ca->sndlen = uio->uio_resid;
6416                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6417                 if (ca->m == NULL) {
6418                         SCTP_FREE(ca, SCTP_M_COPYAL);
6419                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6420                         return (ENOMEM);
6421                 }
6422         } else {
6423                 /* Gather the length of the send */
6424                 struct mbuf *mat;
6425
6426                 mat = m;
6427                 ca->sndlen = 0;
6428                 while (m) {
6429                         ca->sndlen += SCTP_BUF_LEN(m);
6430                         m = SCTP_BUF_NEXT(m);
6431                 }
6432                 ca->m = mat;
6433         }
6434         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6435             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6436             SCTP_ASOC_ANY_STATE,
6437             (void *)ca, 0,
6438             sctp_sendall_completes, inp, 1);
6439         if (ret) {
6440                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6441                 SCTP_FREE(ca, SCTP_M_COPYAL);
6442                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6443                 return (EFAULT);
6444         }
6445         return (0);
6446 }
6447
6448
6449 void
6450 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6451 {
6452         struct sctp_tmit_chunk *chk, *nchk;
6453
6454         chk = TAILQ_FIRST(&asoc->control_send_queue);
6455         while (chk) {
6456                 nchk = TAILQ_NEXT(chk, sctp_next);
6457                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6458                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6459                         if (chk->data) {
6460                                 sctp_m_freem(chk->data);
6461                                 chk->data = NULL;
6462                         }
6463                         asoc->ctrl_queue_cnt--;
6464                         sctp_free_a_chunk(stcb, chk);
6465                 }
6466                 chk = nchk;
6467         }
6468 }
6469
6470 void
6471 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6472 {
6473         struct sctp_association *asoc;
6474         struct sctp_tmit_chunk *chk, *chk_tmp;
6475         struct sctp_asconf_chunk *acp;
6476
6477         asoc = &stcb->asoc;
6478         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6479             chk = chk_tmp) {
6480                 /* get next chk */
6481                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6482                 /* find SCTP_ASCONF chunk in queue */
6483                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6484                         if (chk->data) {
6485                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6486                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6487                                         /* Not Acked yet */
6488                                         break;
6489                                 }
6490                         }
6491                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6492                         if (chk->data) {
6493                                 sctp_m_freem(chk->data);
6494                                 chk->data = NULL;
6495                         }
6496                         asoc->ctrl_queue_cnt--;
6497                         sctp_free_a_chunk(stcb, chk);
6498                 }
6499         }
6500 }
6501
6502
6503 static void
6504 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6505     struct sctp_association *asoc,
6506     struct sctp_tmit_chunk **data_list,
6507     int bundle_at,
6508     struct sctp_nets *net)
6509 {
6510         int i;
6511         struct sctp_tmit_chunk *tp1;
6512
6513         for (i = 0; i < bundle_at; i++) {
6514                 /* off of the send queue */
6515                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6516                 asoc->send_queue_cnt--;
6517                 if (i > 0) {
6518                         /*
6519                          * Any chunk NOT 0 you zap the time chunk 0 gets
6520                          * zapped or set based on if a RTO measurment is
6521                          * needed.
6522                          */
6523                         data_list[i]->do_rtt = 0;
6524                 }
6525                 /* record time */
6526                 data_list[i]->sent_rcv_time = net->last_sent_time;
6527                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6528                 if (data_list[i]->whoTo == NULL) {
6529                         data_list[i]->whoTo = net;
6530                         atomic_add_int(&net->ref_count, 1);
6531                 }
6532                 /* on to the sent queue */
6533                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6534                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6535                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6536                         struct sctp_tmit_chunk *tpp;
6537
6538                         /* need to move back */
6539         back_up_more:
6540                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6541                         if (tpp == NULL) {
6542                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6543                                 goto all_done;
6544                         }
6545                         tp1 = tpp;
6546                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6547                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6548                                 goto back_up_more;
6549                         }
6550                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6551                 } else {
6552                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6553                             data_list[i],
6554                             sctp_next);
6555                 }
6556 all_done:
6557                 /* This does not lower until the cum-ack passes it */
6558                 asoc->sent_queue_cnt++;
6559                 if ((asoc->peers_rwnd <= 0) &&
6560                     (asoc->total_flight == 0) &&
6561                     (bundle_at == 1)) {
6562                         /* Mark the chunk as being a window probe */
6563                         SCTP_STAT_INCR(sctps_windowprobed);
6564                 }
6565 #ifdef SCTP_AUDITING_ENABLED
6566                 sctp_audit_log(0xC2, 3);
6567 #endif
6568                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6569                 data_list[i]->snd_count = 1;
6570                 data_list[i]->rec.data.chunk_was_revoked = 0;
6571                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6572                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6573                             data_list[i]->whoTo->flight_size,
6574                             data_list[i]->book_size,
6575                             (uintptr_t) data_list[i]->whoTo,
6576                             data_list[i]->rec.data.TSN_seq);
6577                 }
6578                 sctp_flight_size_increase(data_list[i]);
6579                 sctp_total_flight_increase(stcb, data_list[i]);
6580                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6581                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6582                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6583                 }
6584                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6585                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6586                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6587                         /* SWS sender side engages */
6588                         asoc->peers_rwnd = 0;
6589                 }
6590         }
6591 }
6592
6593 static void
6594 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6595 {
6596         struct sctp_tmit_chunk *chk, *nchk;
6597
6598         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6599             chk; chk = nchk) {
6600                 nchk = TAILQ_NEXT(chk, sctp_next);
6601                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6602                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6603                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6604                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6605                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6606                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6607                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6608                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6609                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6610                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6611                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6612                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6613                         /* Stray chunks must be cleaned up */
6614         clean_up_anyway:
6615                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6616                         if (chk->data) {
6617                                 sctp_m_freem(chk->data);
6618                                 chk->data = NULL;
6619                         }
6620                         asoc->ctrl_queue_cnt--;
6621                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6622                                 asoc->fwd_tsn_cnt--;
6623                         sctp_free_a_chunk(stcb, chk);
6624                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6625                         /* special handling, we must look into the param */
6626                         if (chk != asoc->str_reset) {
6627                                 goto clean_up_anyway;
6628                         }
6629                 }
6630         }
6631 }
6632
6633
6634 static int
6635 sctp_can_we_split_this(struct sctp_tcb *stcb,
6636     uint32_t length,
6637     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6638 {
6639         /*
6640          * Make a decision on if I should split a msg into multiple parts.
6641          * This is only asked of incomplete messages.
6642          */
6643         if (eeor_on) {
6644                 /*
6645                  * If we are doing EEOR we need to always send it if its the
6646                  * entire thing, since it might be all the guy is putting in
6647                  * the hopper.
6648                  */
6649                 if (goal_mtu >= length) {
6650                         /*-
6651                          * If we have data outstanding,
6652                          * we get another chance when the sack
6653                          * arrives to transmit - wait for more data
6654                          */
6655                         if (stcb->asoc.total_flight == 0) {
6656                                 /*
6657                                  * If nothing is in flight, we zero the
6658                                  * packet counter.
6659                                  */
6660                                 return (length);
6661                         }
6662                         return (0);
6663
6664                 } else {
6665                         /* You can fill the rest */
6666                         return (goal_mtu);
6667                 }
6668         }
6669         /*-
6670          * For those strange folk that make the send buffer
6671          * smaller than our fragmentation point, we can't
6672          * get a full msg in so we have to allow splitting.
6673          */
6674         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6675                 return (length);
6676         }
6677         if ((length <= goal_mtu) ||
6678             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6679                 /* Sub-optimial residual don't split in non-eeor mode. */
6680                 return (0);
6681         }
6682         /*
6683          * If we reach here length is larger than the goal_mtu. Do we wish
6684          * to split it for the sake of packet putting together?
6685          */
6686         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6687                 /* Its ok to split it */
6688                 return (min(goal_mtu, frag_point));
6689         }
6690         /* Nope, can't split */
6691         return (0);
6692
6693 }
6694
6695 static uint32_t
6696 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6697     struct sctp_stream_out *strq,
6698     uint32_t goal_mtu,
6699     uint32_t frag_point,
6700     int *locked,
6701     int *giveup,
6702     int eeor_mode,
6703     int *bail)
6704 {
6705         /* Move from the stream to the send_queue keeping track of the total */
6706         struct sctp_association *asoc;
6707         struct sctp_stream_queue_pending *sp;
6708         struct sctp_tmit_chunk *chk;
6709         struct sctp_data_chunk *dchkh;
6710         uint32_t to_move, length;
6711         uint8_t rcv_flags = 0;
6712         uint8_t some_taken;
6713         uint8_t send_lock_up = 0;
6714
6715         SCTP_TCB_LOCK_ASSERT(stcb);
6716         asoc = &stcb->asoc;
6717 one_more_time:
6718         /* sa_ignore FREED_MEMORY */
6719         sp = TAILQ_FIRST(&strq->outqueue);
6720         if (sp == NULL) {
6721                 *locked = 0;
6722                 if (send_lock_up == 0) {
6723                         SCTP_TCB_SEND_LOCK(stcb);
6724                         send_lock_up = 1;
6725                 }
6726                 sp = TAILQ_FIRST(&strq->outqueue);
6727                 if (sp) {
6728                         goto one_more_time;
6729                 }
6730                 if (strq->last_msg_incomplete) {
6731                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6732                             strq->stream_no,
6733                             strq->last_msg_incomplete);
6734                         strq->last_msg_incomplete = 0;
6735                 }
6736                 to_move = 0;
6737                 if (send_lock_up) {
6738                         SCTP_TCB_SEND_UNLOCK(stcb);
6739                         send_lock_up = 0;
6740                 }
6741                 goto out_of;
6742         }
6743         if ((sp->msg_is_complete) && (sp->length == 0)) {
6744                 if (sp->sender_all_done) {
6745                         /*
6746                          * We are doing differed cleanup. Last time through
6747                          * when we took all the data the sender_all_done was
6748                          * not set.
6749                          */
6750                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6751                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6752                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6753                                     sp->sender_all_done,
6754                                     sp->length,
6755                                     sp->msg_is_complete,
6756                                     sp->put_last_out,
6757                                     send_lock_up);
6758                         }
6759                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6760                                 SCTP_TCB_SEND_LOCK(stcb);
6761                                 send_lock_up = 1;
6762                         }
6763                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6764                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6765                         if (sp->net) {
6766                                 sctp_free_remote_addr(sp->net);
6767                                 sp->net = NULL;
6768                         }
6769                         if (sp->data) {
6770                                 sctp_m_freem(sp->data);
6771                                 sp->data = NULL;
6772                         }
6773                         sctp_free_a_strmoq(stcb, sp);
6774                         /* we can't be locked to it */
6775                         *locked = 0;
6776                         stcb->asoc.locked_on_sending = NULL;
6777                         if (send_lock_up) {
6778                                 SCTP_TCB_SEND_UNLOCK(stcb);
6779                                 send_lock_up = 0;
6780                         }
6781                         /* back to get the next msg */
6782                         goto one_more_time;
6783                 } else {
6784                         /*
6785                          * sender just finished this but still holds a
6786                          * reference
6787                          */
6788                         *locked = 1;
6789                         *giveup = 1;
6790                         to_move = 0;
6791                         goto out_of;
6792                 }
6793         } else {
6794                 /* is there some to get */
6795                 if (sp->length == 0) {
6796                         /* no */
6797                         *locked = 1;
6798                         *giveup = 1;
6799                         to_move = 0;
6800                         goto out_of;
6801                 } else if (sp->discard_rest) {
6802                         if (send_lock_up == 0) {
6803                                 SCTP_TCB_SEND_LOCK(stcb);
6804                                 send_lock_up = 1;
6805                         }
6806                         /* Whack down the size */
6807                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6808                         if ((stcb->sctp_socket != NULL) && \
6809                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6810                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6811                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6812                         }
6813                         if (sp->data) {
6814                                 sctp_m_freem(sp->data);
6815                                 sp->data = NULL;
6816                                 sp->tail_mbuf = NULL;
6817                         }
6818                         sp->length = 0;
6819                         sp->some_taken = 1;
6820                         *locked = 1;
6821                         *giveup = 1;
6822                         to_move = 0;
6823                         goto out_of;
6824                 }
6825         }
6826         some_taken = sp->some_taken;
6827         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6828                 sp->msg_is_complete = 1;
6829         }
6830 re_look:
6831         length = sp->length;
6832         if (sp->msg_is_complete) {
6833                 /* The message is complete */
6834                 to_move = min(length, frag_point);
6835                 if (to_move == length) {
6836                         /* All of it fits in the MTU */
6837                         if (sp->some_taken) {
6838                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6839                                 sp->put_last_out = 1;
6840                         } else {
6841                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6842                                 sp->put_last_out = 1;
6843                         }
6844                 } else {
6845                         /* Not all of it fits, we fragment */
6846                         if (sp->some_taken == 0) {
6847                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6848                         }
6849                         sp->some_taken = 1;
6850                 }
6851         } else {
6852                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6853                 if (to_move) {
6854                         /*-
6855                          * We use a snapshot of length in case it
6856                          * is expanding during the compare.
6857                          */
6858                         uint32_t llen;
6859
6860                         llen = length;
6861                         if (to_move >= llen) {
6862                                 to_move = llen;
6863                                 if (send_lock_up == 0) {
6864                                         /*-
6865                                          * We are taking all of an incomplete msg
6866                                          * thus we need a send lock.
6867                                          */
6868                                         SCTP_TCB_SEND_LOCK(stcb);
6869                                         send_lock_up = 1;
6870                                         if (sp->msg_is_complete) {
6871                                                 /*
6872                                                  * the sender finished the
6873                                                  * msg
6874                                                  */
6875                                                 goto re_look;
6876                                         }
6877                                 }
6878                         }
6879                         if (sp->some_taken == 0) {
6880                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6881                                 sp->some_taken = 1;
6882                         }
6883                 } else {
6884                         /* Nothing to take. */
6885                         if (sp->some_taken) {
6886                                 *locked = 1;
6887                         }
6888                         *giveup = 1;
6889                         to_move = 0;
6890                         goto out_of;
6891                 }
6892         }
6893
6894         /* If we reach here, we can copy out a chunk */
6895         sctp_alloc_a_chunk(stcb, chk);
6896         if (chk == NULL) {
6897                 /* No chunk memory */
6898                 *giveup = 1;
6899                 to_move = 0;
6900                 goto out_of;
6901         }
6902         /*
6903          * Setup for unordered if needed by looking at the user sent info
6904          * flags.
6905          */
6906         if (sp->sinfo_flags & SCTP_UNORDERED) {
6907                 rcv_flags |= SCTP_DATA_UNORDERED;
6908         }
6909         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6910             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6911                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6912         }
6913         /* clear out the chunk before setting up */
6914         memset(chk, 0, sizeof(*chk));
6915         chk->rec.data.rcv_flags = rcv_flags;
6916
6917         if (to_move >= length) {
6918                 /* we think we can steal the whole thing */
6919                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6920                         SCTP_TCB_SEND_LOCK(stcb);
6921                         send_lock_up = 1;
6922                 }
6923                 if (to_move < sp->length) {
6924                         /* bail, it changed */
6925                         goto dont_do_it;
6926                 }
6927                 chk->data = sp->data;
6928                 chk->last_mbuf = sp->tail_mbuf;
6929                 /* register the stealing */
6930                 sp->data = sp->tail_mbuf = NULL;
6931         } else {
6932                 struct mbuf *m;
6933
6934 dont_do_it:
6935                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6936                 chk->last_mbuf = NULL;
6937                 if (chk->data == NULL) {
6938                         sp->some_taken = some_taken;
6939                         sctp_free_a_chunk(stcb, chk);
6940                         *bail = 1;
6941                         to_move = 0;
6942                         goto out_of;
6943                 }
6944 #ifdef SCTP_MBUF_LOGGING
6945                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6946                         struct mbuf *mat;
6947
6948                         mat = chk->data;
6949                         while (mat) {
6950                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6951                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6952                                 }
6953                                 mat = SCTP_BUF_NEXT(mat);
6954                         }
6955                 }
6956 #endif
6957                 /* Pull off the data */
6958                 m_adj(sp->data, to_move);
6959                 /* Now lets work our way down and compact it */
6960                 m = sp->data;
6961                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6962                         sp->data = SCTP_BUF_NEXT(m);
6963                         SCTP_BUF_NEXT(m) = NULL;
6964                         if (sp->tail_mbuf == m) {
6965                                 /*-
6966                                  * Freeing tail? TSNH since
6967                                  * we supposedly were taking less
6968                                  * than the sp->length.
6969                                  */
6970 #ifdef INVARIANTS
6971                                 panic("Huh, freing tail? - TSNH");
6972 #else
6973                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6974                                 sp->tail_mbuf = sp->data = NULL;
6975                                 sp->length = 0;
6976 #endif
6977
6978                         }
6979                         sctp_m_free(m);
6980                         m = sp->data;
6981                 }
6982         }
6983         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6984                 chk->copy_by_ref = 1;
6985         } else {
6986                 chk->copy_by_ref = 0;
6987         }
6988         /*
6989          * get last_mbuf and counts of mb useage This is ugly but hopefully
6990          * its only one mbuf.
6991          */
6992         if (chk->last_mbuf == NULL) {
6993                 chk->last_mbuf = chk->data;
6994                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6995                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6996                 }
6997         }
6998         if (to_move > length) {
6999                 /*- This should not happen either
7000                  * since we always lower to_move to the size
7001                  * of sp->length if its larger.
7002                  */
7003 #ifdef INVARIANTS
7004                 panic("Huh, how can to_move be larger?");
7005 #else
7006                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7007                 sp->length = 0;
7008 #endif
7009         } else {
7010                 atomic_subtract_int(&sp->length, to_move);
7011         }
7012         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7013                 /* Not enough room for a chunk header, get some */
7014                 struct mbuf *m;
7015
7016                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7017                 if (m == NULL) {
7018                         /*
7019                          * we're in trouble here. _PREPEND below will free
7020                          * all the data if there is no leading space, so we
7021                          * must put the data back and restore.
7022                          */
7023                         if (send_lock_up == 0) {
7024                                 SCTP_TCB_SEND_LOCK(stcb);
7025                                 send_lock_up = 1;
7026                         }
7027                         if (chk->data == NULL) {
7028                                 /* unsteal the data */
7029                                 sp->data = chk->data;
7030                                 sp->tail_mbuf = chk->last_mbuf;
7031                         } else {
7032                                 struct mbuf *m_tmp;
7033
7034                                 /* reassemble the data */
7035                                 m_tmp = sp->data;
7036                                 sp->data = chk->data;
7037                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7038                         }
7039                         sp->some_taken = some_taken;
7040                         atomic_add_int(&sp->length, to_move);
7041                         chk->data = NULL;
7042                         *bail = 1;
7043                         sctp_free_a_chunk(stcb, chk);
7044                         to_move = 0;
7045                         goto out_of;
7046                 } else {
7047                         SCTP_BUF_LEN(m) = 0;
7048                         SCTP_BUF_NEXT(m) = chk->data;
7049                         chk->data = m;
7050                         M_ALIGN(chk->data, 4);
7051                 }
7052         }
7053         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7054         if (chk->data == NULL) {
7055                 /* HELP, TSNH since we assured it would not above? */
7056 #ifdef INVARIANTS
7057                 panic("prepend failes HELP?");
7058 #else
7059                 SCTP_PRINTF("prepend fails HELP?\n");
7060                 sctp_free_a_chunk(stcb, chk);
7061 #endif
7062                 *bail = 1;
7063                 to_move = 0;
7064                 goto out_of;
7065         }
7066         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7067         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7068         chk->book_size_scale = 0;
7069         chk->sent = SCTP_DATAGRAM_UNSENT;
7070
7071         chk->flags = 0;
7072         chk->asoc = &stcb->asoc;
7073         chk->pad_inplace = 0;
7074         chk->no_fr_allowed = 0;
7075         chk->rec.data.stream_seq = sp->strseq;
7076         chk->rec.data.stream_number = sp->stream;
7077         chk->rec.data.payloadtype = sp->ppid;
7078         chk->rec.data.context = sp->context;
7079         chk->rec.data.doing_fast_retransmit = 0;
7080         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7081
7082         chk->rec.data.timetodrop = sp->ts;
7083         chk->flags = sp->act_flags;
7084
7085         if (sp->net) {
7086                 chk->whoTo = sp->net;
7087                 atomic_add_int(&chk->whoTo->ref_count, 1);
7088         } else
7089                 chk->whoTo = NULL;
7090
7091         if (sp->holds_key_ref) {
7092                 chk->auth_keyid = sp->auth_keyid;
7093                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7094                 chk->holds_key_ref = 1;
7095         }
7096         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7097         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7098                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7099                     (uintptr_t) stcb, sp->length,
7100                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7101                     chk->rec.data.TSN_seq);
7102         }
7103         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7104         /*
7105          * Put the rest of the things in place now. Size was done earlier in
7106          * previous loop prior to padding.
7107          */
7108
7109 #ifdef SCTP_ASOCLOG_OF_TSNS
7110         SCTP_TCB_LOCK_ASSERT(stcb);
7111         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7112                 asoc->tsn_out_at = 0;
7113                 asoc->tsn_out_wrapped = 1;
7114         }
7115         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7116         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7117         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7118         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7119         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7120         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7121         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7122         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7123         asoc->tsn_out_at++;
7124 #endif
7125
7126         dchkh->ch.chunk_type = SCTP_DATA;
7127         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7128         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7129         dchkh->dp.stream_id = htons(strq->stream_no);
7130         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7131         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7132         dchkh->ch.chunk_length = htons(chk->send_size);
7133         /* Now advance the chk->send_size by the actual pad needed. */
7134         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7135                 /* need a pad */
7136                 struct mbuf *lm;
7137                 int pads;
7138
7139                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7140                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7141                         chk->pad_inplace = 1;
7142                 }
7143                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7144                         /* pad added an mbuf */
7145                         chk->last_mbuf = lm;
7146                 }
7147                 chk->send_size += pads;
7148         }
7149         /* We only re-set the policy if it is on */
7150         if (sp->pr_sctp_on) {
7151                 sctp_set_prsctp_policy(sp);
7152                 asoc->pr_sctp_cnt++;
7153                 chk->pr_sctp_on = 1;
7154         } else {
7155                 chk->pr_sctp_on = 0;
7156         }
7157         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7158                 /* All done pull and kill the message */
7159                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7160                 if (sp->put_last_out == 0) {
7161                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7162                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7163                             sp->sender_all_done,
7164                             sp->length,
7165                             sp->msg_is_complete,
7166                             sp->put_last_out,
7167                             send_lock_up);
7168                 }
7169                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7170                         SCTP_TCB_SEND_LOCK(stcb);
7171                         send_lock_up = 1;
7172                 }
7173                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7174                 if (sp->net) {
7175                         sctp_free_remote_addr(sp->net);
7176                         sp->net = NULL;
7177                 }
7178                 if (sp->data) {
7179                         sctp_m_freem(sp->data);
7180                         sp->data = NULL;
7181                 }
7182                 sctp_free_a_strmoq(stcb, sp);
7183
7184                 /* we can't be locked to it */
7185                 *locked = 0;
7186                 stcb->asoc.locked_on_sending = NULL;
7187         } else {
7188                 /* more to go, we are locked */
7189                 *locked = 1;
7190         }
7191         asoc->chunks_on_out_queue++;
7192         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7193         asoc->send_queue_cnt++;
7194 out_of:
7195         if (send_lock_up) {
7196                 SCTP_TCB_SEND_UNLOCK(stcb);
7197                 send_lock_up = 0;
7198         }
7199         return (to_move);
7200 }
7201
7202
7203 static struct sctp_stream_out *
7204 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7205 {
7206         struct sctp_stream_out *strq;
7207
7208         /* Find the next stream to use */
7209         if (asoc->last_out_stream == NULL) {
7210                 strq = TAILQ_FIRST(&asoc->out_wheel);
7211         } else {
7212                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7213                 if (strq == NULL) {
7214                         strq = TAILQ_FIRST(&asoc->out_wheel);
7215                 }
7216         }
7217         return (strq);
7218 }
7219
7220
7221 static void
7222 sctp_fill_outqueue(struct sctp_tcb *stcb,
7223     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7224 {
7225         struct sctp_association *asoc;
7226         struct sctp_stream_out *strq, *strqn;
7227         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7228         int locked, giveup;
7229         struct sctp_stream_queue_pending *sp;
7230
7231         SCTP_TCB_LOCK_ASSERT(stcb);
7232         asoc = &stcb->asoc;
7233 #ifdef INET6
7234         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7235                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7236         } else {
7237                 /* ?? not sure what else to do */
7238                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7239         }
7240 #else
7241         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7242 #endif
7243         /* Need an allowance for the data chunk header too */
7244         goal_mtu -= sizeof(struct sctp_data_chunk);
7245
7246         /* must make even word boundary */
7247         goal_mtu &= 0xfffffffc;
7248         if (asoc->locked_on_sending) {
7249                 /* We are stuck on one stream until the message completes. */
7250                 strq = asoc->locked_on_sending;
7251                 locked = 1;
7252         } else {
7253                 strq = sctp_select_a_stream(stcb, asoc);
7254                 locked = 0;
7255         }
7256         strqn = strq;
7257         while ((goal_mtu > 0) && strq) {
7258                 sp = TAILQ_FIRST(&strq->outqueue);
7259                 if (sp == NULL) {
7260                         break;
7261                 }
7262                 /**
7263                  * Honor the users' choice if given. If not given,
7264                  * pull it only to the primary path in case of not using
7265                  * CMT.
7266                  */
7267                 if (((sp->net != NULL) &&
7268                     (sp->net != net)) ||
7269                     ((sp->net == NULL) &&
7270                     (asoc->sctp_cmt_on_off == 0) &&
7271                     (asoc->primary_destination != net))) {
7272                         /* Do not pull to this network */
7273                         if (locked) {
7274                                 break;
7275                         } else {
7276                                 strq = sctp_select_a_stream(stcb, asoc);
7277                                 if (strq == NULL)
7278                                         /* none left */
7279                                         break;
7280                                 if (strqn == strq) {
7281                                         /* I have circled */
7282                                         break;
7283                                 }
7284                                 continue;
7285                         }
7286                 }
7287                 giveup = 0;
7288                 bail = 0;
7289                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7290                     &giveup, eeor_mode, &bail);
7291                 if (moved_how_much)
7292                         asoc->last_out_stream = strq;
7293
7294                 if (locked) {
7295                         asoc->locked_on_sending = strq;
7296                         if ((moved_how_much == 0) || (giveup) || bail)
7297                                 /* no more to move for now */
7298                                 break;
7299                 } else {
7300                         asoc->locked_on_sending = NULL;
7301                         if (TAILQ_EMPTY(&strq->outqueue)) {
7302                                 if (strq == strqn) {
7303                                         /* Must move start to next one */
7304                                         strqn = TAILQ_NEXT(strq, next_spoke);
7305                                         if (strqn == NULL) {
7306                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7307                                                 if (strqn == NULL) {
7308                                                         break;
7309                                                 }
7310                                         }
7311                                 }
7312                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7313                         }
7314                         if ((giveup) || bail) {
7315                                 break;
7316                         }
7317                         strq = sctp_select_a_stream(stcb, asoc);
7318                         if (strq == NULL) {
7319                                 break;
7320                         }
7321                 }
7322                 total_moved += moved_how_much;
7323                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7324                 goal_mtu &= 0xfffffffc;
7325         }
7326         if (bail)
7327                 *quit_now = 1;
7328
7329         if (total_moved == 0) {
7330                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7331                     (net == stcb->asoc.primary_destination)) {
7332                         /* ran dry for primary network net */
7333                         SCTP_STAT_INCR(sctps_primary_randry);
7334                 } else if (stcb->asoc.sctp_cmt_on_off == 1) {
7335                         /* ran dry with CMT on */
7336                         SCTP_STAT_INCR(sctps_cmt_randry);
7337                 }
7338         }
7339 }
7340
7341 void
7342 sctp_fix_ecn_echo(struct sctp_association *asoc)
7343 {
7344         struct sctp_tmit_chunk *chk;
7345
7346         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7347                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7348                         chk->sent = SCTP_DATAGRAM_UNSENT;
7349                 }
7350         }
7351 }
7352
7353 void
7354 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7355 {
7356         struct sctp_association *asoc;
7357         struct sctp_stream_out *outs;
7358         struct sctp_tmit_chunk *chk;
7359         struct sctp_stream_queue_pending *sp;
7360
7361         if (net == NULL) {
7362                 return;
7363         }
7364         asoc = &stcb->asoc;
7365         TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
7366                 TAILQ_FOREACH(sp, &outs->outqueue, next) {
7367                         if (sp->net == net) {
7368                                 sctp_free_remote_addr(sp->net);
7369                                 sp->net = NULL;
7370                         }
7371                 }
7372         }
7373         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7374                 if (chk->whoTo == net) {
7375                         sctp_free_remote_addr(chk->whoTo);
7376                         chk->whoTo = NULL;
7377                 }
7378         }
7379 }
7380
7381 int
7382 sctp_med_chunk_output(struct sctp_inpcb *inp,
7383     struct sctp_tcb *stcb,
7384     struct sctp_association *asoc,
7385     int *num_out,
7386     int *reason_code,
7387     int control_only, int from_where,
7388     struct timeval *now, int *now_filled, int frag_point, int so_locked
7389 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7390     SCTP_UNUSED
7391 #endif
7392 )
7393 {
7394         /*
7395          * Ok this is the generic chunk service queue. we must do the
7396          * following: - Service the stream queue that is next, moving any
7397          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7398          * LAST to the out queue in one pass) and assigning TSN's - Check to
7399          * see if the cwnd/rwnd allows any output, if so we go ahead and
7400          * fomulate and send the low level chunks. Making sure to combine
7401          * any control in the control chunk queue also.
7402          */
7403         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7404         struct mbuf *outchain, *endoutchain;
7405         struct sctp_tmit_chunk *chk, *nchk;
7406
7407         /* temp arrays for unlinking */
7408         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7409         int no_fragmentflg, error;
7410         unsigned int max_rwnd_per_dest, max_send_per_dest;
7411         int one_chunk, hbflag, skip_data_for_this_net;
7412         int asconf, cookie, no_out_cnt;
7413         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7414         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7415         int tsns_sent = 0;
7416         uint32_t auth_offset = 0;
7417         struct sctp_auth_chunk *auth = NULL;
7418         uint16_t auth_keyid;
7419         int override_ok = 1;
7420         int data_auth_reqd = 0;
7421
7422         /*
7423          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7424          * destination.
7425          */
7426         int pf_hbflag = 0;
7427         int quit_now = 0;
7428
7429         *num_out = 0;
7430         auth_keyid = stcb->asoc.authinfo.active_keyid;
7431
7432         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7433             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7434             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7435                 eeor_mode = 1;
7436         } else {
7437                 eeor_mode = 0;
7438         }
7439         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7440         /*
7441          * First lets prime the pump. For each destination, if there is room
7442          * in the flight size, attempt to pull an MTU's worth out of the
7443          * stream queues into the general send_queue
7444          */
7445 #ifdef SCTP_AUDITING_ENABLED
7446         sctp_audit_log(0xC2, 2);
7447 #endif
7448         SCTP_TCB_LOCK_ASSERT(stcb);
7449         hbflag = 0;
7450         if ((control_only) || (asoc->stream_reset_outstanding))
7451                 no_data_chunks = 1;
7452         else
7453                 no_data_chunks = 0;
7454
7455         /* Nothing to possible to send? */
7456         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7457             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7458             TAILQ_EMPTY(&asoc->send_queue) &&
7459             TAILQ_EMPTY(&asoc->out_wheel)) {
7460                 *reason_code = 9;
7461                 return (0);
7462         }
7463         if (asoc->peers_rwnd == 0) {
7464                 /* No room in peers rwnd */
7465                 *reason_code = 1;
7466                 if (asoc->total_flight > 0) {
7467                         /* we are allowed one chunk in flight */
7468                         no_data_chunks = 1;
7469                 }
7470         }
7471         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7472         if (stcb->sctp_socket)
7473                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7474         else
7475                 max_send_per_dest = 0;
7476         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7477                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7478                         /*
7479                          * This for loop we are in takes in each net, if
7480                          * its's got space in cwnd and has data sent to it
7481                          * (when CMT is off) then it calls
7482                          * sctp_fill_outqueue for the net. This gets data on
7483                          * the send queue for that network.
7484                          *
7485                          * In sctp_fill_outqueue TSN's are assigned and data is
7486                          * copied out of the stream buffers. Note mostly
7487                          * copy by reference (we hope).
7488                          */
7489                         net->window_probe = 0;
7490                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ||
7491                             (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7492                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7493                                         sctp_log_cwnd(stcb, net, 1,
7494                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7495                                 }
7496                                 continue;
7497                         }
7498                         if ((asoc->sctp_cmt_on_off == 0) &&
7499                             (asoc->primary_destination != net) &&
7500                             (net->ref_count < 2)) {
7501                                 /* nothing can be in queue for this guy */
7502                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7503                                         sctp_log_cwnd(stcb, net, 2,
7504                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7505                                 }
7506                                 continue;
7507                         }
7508                         if (net->flight_size >= net->cwnd) {
7509                                 /* skip this network, no room - can't fill */
7510                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7511                                         sctp_log_cwnd(stcb, net, 3,
7512                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7513                                 }
7514                                 continue;
7515                         }
7516                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7517                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7518                         }
7519                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7520                         if (quit_now) {
7521                                 /* memory alloc failure */
7522                                 no_data_chunks = 1;
7523                                 break;
7524                         }
7525                 }
7526         }
7527         /* now service each destination and send out what we can for it */
7528         /* Nothing to send? */
7529         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7530             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7531             TAILQ_EMPTY(&asoc->send_queue)) {
7532                 *reason_code = 8;
7533                 return (0);
7534         }
7535         if (asoc->sctp_cmt_on_off == 1) {
7536                 /* get the last start point */
7537                 start_at = asoc->last_net_cmt_send_started;
7538                 if (start_at == NULL) {
7539                         /* null so to beginning */
7540                         start_at = TAILQ_FIRST(&asoc->nets);
7541                 } else {
7542                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7543                         if (start_at == NULL) {
7544                                 start_at = TAILQ_FIRST(&asoc->nets);
7545                         }
7546                 }
7547                 asoc->last_net_cmt_send_started = start_at;
7548         } else {
7549                 start_at = TAILQ_FIRST(&asoc->nets);
7550         }
7551         old_start_at = NULL;
7552 again_one_more_time:
7553         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7554                 /* how much can we send? */
7555                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7556                 if (old_start_at && (old_start_at == net)) {
7557                         /* through list ocmpletely. */
7558                         break;
7559                 }
7560                 tsns_sent = 0xa;
7561                 if ((asoc->sctp_cmt_on_off == 0) &&
7562                     (asoc->primary_destination != net) &&
7563                     (net->ref_count < 2)) {
7564                         /*
7565                          * Ref-count of 1 so we cannot have data or control
7566                          * queued to this address. Skip it (non-CMT).
7567                          */
7568                         continue;
7569                 }
7570                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7571                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7572                     (net->flight_size >= net->cwnd)) {
7573                         /*
7574                          * Nothing on control or asconf and flight is full,
7575                          * we can skip even in the CMT case.
7576                          */
7577                         continue;
7578                 }
7579                 ctl_cnt = bundle_at = 0;
7580                 endoutchain = outchain = NULL;
7581                 no_fragmentflg = 1;
7582                 one_chunk = 0;
7583                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7584                         skip_data_for_this_net = 1;
7585                 } else {
7586                         skip_data_for_this_net = 0;
7587                 }
7588                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7589                         /*
7590                          * if we have a route and an ifp check to see if we
7591                          * have room to send to this guy
7592                          */
7593                         struct ifnet *ifp;
7594
7595                         ifp = net->ro.ro_rt->rt_ifp;
7596                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7597                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7598                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7599                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7600                                 }
7601                                 continue;
7602                         }
7603                 }
7604                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7605                 case AF_INET:
7606                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7607                         break;
7608 #ifdef INET6
7609                 case AF_INET6:
7610                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7611                         break;
7612 #endif
7613                 default:
7614                         /* TSNH */
7615                         mtu = net->mtu;
7616                         break;
7617                 }
7618                 mx_mtu = mtu;
7619                 to_out = 0;
7620                 if (mtu > asoc->peers_rwnd) {
7621                         if (asoc->total_flight > 0) {
7622                                 /* We have a packet in flight somewhere */
7623                                 r_mtu = asoc->peers_rwnd;
7624                         } else {
7625                                 /* We are always allowed to send one MTU out */
7626                                 one_chunk = 1;
7627                                 r_mtu = mtu;
7628                         }
7629                 } else {
7630                         r_mtu = mtu;
7631                 }
7632                 /************************/
7633                 /* ASCONF transmission */
7634                 /************************/
7635                 /* Now first lets go through the asconf queue */
7636                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7637                     chk; chk = nchk) {
7638                         nchk = TAILQ_NEXT(chk, sctp_next);
7639                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7640                                 continue;
7641                         }
7642                         if (chk->whoTo != net) {
7643                                 /*
7644                                  * No, not sent to the network we are
7645                                  * looking at
7646                                  */
7647                                 break;
7648                         }
7649                         if (chk->data == NULL) {
7650                                 break;
7651                         }
7652                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7653                             chk->sent != SCTP_DATAGRAM_RESEND) {
7654                                 break;
7655                         }
7656                         /*
7657                          * if no AUTH is yet included and this chunk
7658                          * requires it, make sure to account for it.  We
7659                          * don't apply the size until the AUTH chunk is
7660                          * actually added below in case there is no room for
7661                          * this chunk. NOTE: we overload the use of "omtu"
7662                          * here
7663                          */
7664                         if ((auth == NULL) &&
7665                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7666                             stcb->asoc.peer_auth_chunks)) {
7667                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7668                         } else
7669                                 omtu = 0;
7670                         /* Here we do NOT factor the r_mtu */
7671                         if ((chk->send_size < (int)(mtu - omtu)) ||
7672                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7673                                 /*
7674                                  * We probably should glom the mbuf chain
7675                                  * from the chk->data for control but the
7676                                  * problem is it becomes yet one more level
7677                                  * of tracking to do if for some reason
7678                                  * output fails. Then I have got to
7679                                  * reconstruct the merged control chain.. el
7680                                  * yucko.. for now we take the easy way and
7681                                  * do the copy
7682                                  */
7683                                 /*
7684                                  * Add an AUTH chunk, if chunk requires it
7685                                  * save the offset into the chain for AUTH
7686                                  */
7687                                 if ((auth == NULL) &&
7688                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7689                                     stcb->asoc.peer_auth_chunks))) {
7690                                         outchain = sctp_add_auth_chunk(outchain,
7691                                             &endoutchain,
7692                                             &auth,
7693                                             &auth_offset,
7694                                             stcb,
7695                                             chk->rec.chunk_id.id);
7696                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7697                                 }
7698                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7699                                     (int)chk->rec.chunk_id.can_take_data,
7700                                     chk->send_size, chk->copy_by_ref);
7701                                 if (outchain == NULL) {
7702                                         *reason_code = 8;
7703                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7704                                         return (ENOMEM);
7705                                 }
7706                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7707                                 /* update our MTU size */
7708                                 if (mtu > (chk->send_size + omtu))
7709                                         mtu -= (chk->send_size + omtu);
7710                                 else
7711                                         mtu = 0;
7712                                 to_out += (chk->send_size + omtu);
7713                                 /* Do clear IP_DF ? */
7714                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7715                                         no_fragmentflg = 0;
7716                                 }
7717                                 if (chk->rec.chunk_id.can_take_data)
7718                                         chk->data = NULL;
7719                                 /*
7720                                  * set hb flag since we can use these for
7721                                  * RTO
7722                                  */
7723                                 hbflag = 1;
7724                                 asconf = 1;
7725                                 /*
7726                                  * should sysctl this: don't bundle data
7727                                  * with ASCONF since it requires AUTH
7728                                  */
7729                                 no_data_chunks = 1;
7730                                 chk->sent = SCTP_DATAGRAM_SENT;
7731                                 chk->snd_count++;
7732                                 if (mtu == 0) {
7733                                         /*
7734                                          * Ok we are out of room but we can
7735                                          * output without effecting the
7736                                          * flight size since this little guy
7737                                          * is a control only packet.
7738                                          */
7739                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7740                                         /*
7741                                          * do NOT clear the asconf flag as
7742                                          * it is used to do appropriate
7743                                          * source address selection.
7744                                          */
7745                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7746                                             (struct sockaddr *)&net->ro._l_addr,
7747                                             outchain, auth_offset, auth,
7748                                             stcb->asoc.authinfo.active_keyid,
7749                                             no_fragmentflg, 0, NULL, asconf,
7750                                             inp->sctp_lport, stcb->rport,
7751                                             htonl(stcb->asoc.peer_vtag),
7752                                             net->port, so_locked, NULL))) {
7753                                                 if (error == ENOBUFS) {
7754                                                         asoc->ifp_had_enobuf = 1;
7755                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7756                                                 }
7757                                                 if (from_where == 0) {
7758                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7759                                                 }
7760                                                 if (*now_filled == 0) {
7761                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7762                                                         *now_filled = 1;
7763                                                         *now = net->last_sent_time;
7764                                                 } else {
7765                                                         net->last_sent_time = *now;
7766                                                 }
7767                                                 hbflag = 0;
7768                                                 /* error, could not output */
7769                                                 if (error == EHOSTUNREACH) {
7770                                                         /*
7771                                                          * Destination went
7772                                                          * unreachable
7773                                                          * during this send
7774                                                          */
7775                                                         sctp_move_chunks_from_net(stcb, net);
7776                                                 }
7777                                                 *reason_code = 7;
7778                                                 continue;
7779                                         } else
7780                                                 asoc->ifp_had_enobuf = 0;
7781                                         if (*now_filled == 0) {
7782                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7783                                                 *now_filled = 1;
7784                                                 *now = net->last_sent_time;
7785                                         } else {
7786                                                 net->last_sent_time = *now;
7787                                         }
7788                                         hbflag = 0;
7789                                         /*
7790                                          * increase the number we sent, if a
7791                                          * cookie is sent we don't tell them
7792                                          * any was sent out.
7793                                          */
7794                                         outchain = endoutchain = NULL;
7795                                         auth = NULL;
7796                                         auth_offset = 0;
7797                                         if (!no_out_cnt)
7798                                                 *num_out += ctl_cnt;
7799                                         /* recalc a clean slate and setup */
7800                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7801                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7802                                         } else {
7803                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7804                                         }
7805                                         to_out = 0;
7806                                         no_fragmentflg = 1;
7807                                 }
7808                         }
7809                 }
7810                 /************************/
7811                 /* Control transmission */
7812                 /************************/
7813                 /* Now first lets go through the control queue */
7814                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7815                     chk; chk = nchk) {
7816                         nchk = TAILQ_NEXT(chk, sctp_next);
7817                         if (chk->whoTo != net) {
7818                                 /*
7819                                  * No, not sent to the network we are
7820                                  * looking at
7821                                  */
7822                                 continue;
7823                         }
7824                         if (chk->data == NULL) {
7825                                 continue;
7826                         }
7827                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7828                                 /*
7829                                  * It must be unsent. Cookies and ASCONF's
7830                                  * hang around but there timers will force
7831                                  * when marked for resend.
7832                                  */
7833                                 continue;
7834                         }
7835                         /*
7836                          * if no AUTH is yet included and this chunk
7837                          * requires it, make sure to account for it.  We
7838                          * don't apply the size until the AUTH chunk is
7839                          * actually added below in case there is no room for
7840                          * this chunk. NOTE: we overload the use of "omtu"
7841                          * here
7842                          */
7843                         if ((auth == NULL) &&
7844                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7845                             stcb->asoc.peer_auth_chunks)) {
7846                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7847                         } else
7848                                 omtu = 0;
7849                         /* Here we do NOT factor the r_mtu */
7850                         if ((chk->send_size <= (int)(mtu - omtu)) ||
7851                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7852                                 /*
7853                                  * We probably should glom the mbuf chain
7854                                  * from the chk->data for control but the
7855                                  * problem is it becomes yet one more level
7856                                  * of tracking to do if for some reason
7857                                  * output fails. Then I have got to
7858                                  * reconstruct the merged control chain.. el
7859                                  * yucko.. for now we take the easy way and
7860                                  * do the copy
7861                                  */
7862                                 /*
7863                                  * Add an AUTH chunk, if chunk requires it
7864                                  * save the offset into the chain for AUTH
7865                                  */
7866                                 if ((auth == NULL) &&
7867                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7868                                     stcb->asoc.peer_auth_chunks))) {
7869                                         outchain = sctp_add_auth_chunk(outchain,
7870                                             &endoutchain,
7871                                             &auth,
7872                                             &auth_offset,
7873                                             stcb,
7874                                             chk->rec.chunk_id.id);
7875                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7876                                 }
7877                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7878                                     (int)chk->rec.chunk_id.can_take_data,
7879                                     chk->send_size, chk->copy_by_ref);
7880                                 if (outchain == NULL) {
7881                                         *reason_code = 8;
7882                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7883                                         return (ENOMEM);
7884                                 }
7885                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7886                                 /* update our MTU size */
7887                                 if (mtu > (chk->send_size + omtu))
7888                                         mtu -= (chk->send_size + omtu);
7889                                 else
7890                                         mtu = 0;
7891                                 to_out += (chk->send_size + omtu);
7892                                 /* Do clear IP_DF ? */
7893                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7894                                         no_fragmentflg = 0;
7895                                 }
7896                                 if (chk->rec.chunk_id.can_take_data)
7897                                         chk->data = NULL;
7898                                 /* Mark things to be removed, if needed */
7899                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7900                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7901                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7902                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7903                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7904                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7905                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7906                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7907                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7908                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7909                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7910
7911                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7912                                                 hbflag = 1;
7913                                                 /*
7914                                                  * JRS 5/14/07 - Set the
7915                                                  * flag to say a heartbeat
7916                                                  * is being sent.
7917                                                  */
7918                                                 pf_hbflag = 1;
7919                                         }
7920                                         /* remove these chunks at the end */
7921                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7922                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7923                                                 /* turn off the timer */
7924                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7925                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7926                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7927                                                 }
7928                                         }
7929                                         ctl_cnt++;
7930                                 } else {
7931                                         /*
7932                                          * Other chunks, since they have
7933                                          * timers running (i.e. COOKIE) we
7934                                          * just "trust" that it gets sent or
7935                                          * retransmitted.
7936                                          */
7937                                         ctl_cnt++;
7938                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7939                                                 cookie = 1;
7940                                                 no_out_cnt = 1;
7941                                         }
7942                                         chk->sent = SCTP_DATAGRAM_SENT;
7943                                         chk->snd_count++;
7944                                 }
7945                                 if (mtu == 0) {
7946                                         /*
7947                                          * Ok we are out of room but we can
7948                                          * output without effecting the
7949                                          * flight size since this little guy
7950                                          * is a control only packet.
7951                                          */
7952                                         if (asconf) {
7953                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7954                                                 /*
7955                                                  * do NOT clear the asconf
7956                                                  * flag as it is used to do
7957                                                  * appropriate source
7958                                                  * address selection.
7959                                                  */
7960                                         }
7961                                         if (cookie) {
7962                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7963                                                 cookie = 0;
7964                                         }
7965                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7966                                             (struct sockaddr *)&net->ro._l_addr,
7967                                             outchain,
7968                                             auth_offset, auth,
7969                                             stcb->asoc.authinfo.active_keyid,
7970                                             no_fragmentflg, 0, NULL, asconf,
7971                                             inp->sctp_lport, stcb->rport,
7972                                             htonl(stcb->asoc.peer_vtag),
7973                                             net->port, so_locked, NULL))) {
7974                                                 if (error == ENOBUFS) {
7975                                                         asoc->ifp_had_enobuf = 1;
7976                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7977                                                 }
7978                                                 if (from_where == 0) {
7979                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7980                                                 }
7981                                                 /* error, could not output */
7982                                                 if (hbflag) {
7983                                                         if (*now_filled == 0) {
7984                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7985                                                                 *now_filled = 1;
7986                                                                 *now = net->last_sent_time;
7987                                                         } else {
7988                                                                 net->last_sent_time = *now;
7989                                                         }
7990                                                         hbflag = 0;
7991                                                 }
7992                                                 if (error == EHOSTUNREACH) {
7993                                                         /*
7994                                                          * Destination went
7995                                                          * unreachable
7996                                                          * during this send
7997                                                          */
7998                                                         sctp_move_chunks_from_net(stcb, net);
7999                                                 }
8000                                                 *reason_code = 7;
8001                                                 continue;
8002                                         } else
8003                                                 asoc->ifp_had_enobuf = 0;
8004                                         /* Only HB or ASCONF advances time */
8005                                         if (hbflag) {
8006                                                 if (*now_filled == 0) {
8007                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8008                                                         *now_filled = 1;
8009                                                         *now = net->last_sent_time;
8010                                                 } else {
8011                                                         net->last_sent_time = *now;
8012                                                 }
8013                                                 hbflag = 0;
8014                                         }
8015                                         /*
8016                                          * increase the number we sent, if a
8017                                          * cookie is sent we don't tell them
8018                                          * any was sent out.
8019                                          */
8020                                         outchain = endoutchain = NULL;
8021                                         auth = NULL;
8022                                         auth_offset = 0;
8023                                         if (!no_out_cnt)
8024                                                 *num_out += ctl_cnt;
8025                                         /* recalc a clean slate and setup */
8026                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8027                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8028                                         } else {
8029                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8030                                         }
8031                                         to_out = 0;
8032                                         no_fragmentflg = 1;
8033                                 }
8034                         }
8035                 }
8036                 /* JRI: if dest is in PF state, do not send data to it */
8037                 if ((asoc->sctp_cmt_on_off == 1) &&
8038                     (asoc->sctp_cmt_pf > 0) &&
8039                     (net->dest_state & SCTP_ADDR_PF)) {
8040                         goto no_data_fill;
8041                 }
8042                 if (net->flight_size >= net->cwnd) {
8043                         goto no_data_fill;
8044                 }
8045                 if ((asoc->sctp_cmt_on_off == 1) &&
8046                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8047                     (net->flight_size > max_rwnd_per_dest)) {
8048                         goto no_data_fill;
8049                 }
8050                 /*
8051                  * We need a specific accounting for the usage of the send
8052                  * buffer. We also need to check the number of messages per
8053                  * net. For now, this is better than nothing and it disabled
8054                  * by default...
8055                  */
8056                 if ((asoc->sctp_cmt_on_off == 1) &&
8057                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8058                     (max_send_per_dest > 0) &&
8059                     (net->flight_size > max_send_per_dest)) {
8060                         goto no_data_fill;
8061                 }
8062                 /*********************/
8063                 /* Data transmission */
8064                 /*********************/
8065                 /*
8066                  * if AUTH for DATA is required and no AUTH has been added
8067                  * yet, account for this in the mtu now... if no data can be
8068                  * bundled, this adjustment won't matter anyways since the
8069                  * packet will be going out...
8070                  */
8071                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8072                     stcb->asoc.peer_auth_chunks);
8073                 if (data_auth_reqd && (auth == NULL)) {
8074                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8075                 }
8076                 /* now lets add any data within the MTU constraints */
8077                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8078                 case AF_INET:
8079                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8080                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8081                         else
8082                                 omtu = 0;
8083                         break;
8084 #ifdef INET6
8085                 case AF_INET6:
8086                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8087                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8088                         else
8089                                 omtu = 0;
8090                         break;
8091 #endif
8092                 default:
8093                         /* TSNH */
8094                         omtu = 0;
8095                         break;
8096                 }
8097                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8098                     (skip_data_for_this_net == 0)) ||
8099                     (cookie)) {
8100                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8101                                 if (no_data_chunks) {
8102                                         /* let only control go out */
8103                                         *reason_code = 1;
8104                                         break;
8105                                 }
8106                                 if (net->flight_size >= net->cwnd) {
8107                                         /* skip this net, no room for data */
8108                                         *reason_code = 2;
8109                                         break;
8110                                 }
8111                                 nchk = TAILQ_NEXT(chk, sctp_next);
8112                                 if ((chk->whoTo != NULL) &&
8113                                     (chk->whoTo != net)) {
8114                                         /* Don't send the chunk on this net */
8115                                         continue;
8116                                 }
8117                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8118                                         /*-
8119                                          * strange, we have a chunk that is
8120                                          * to big for its destination and
8121                                          * yet no fragment ok flag.
8122                                          * Something went wrong when the
8123                                          * PMTU changed...we did not mark
8124                                          * this chunk for some reason?? I
8125                                          * will fix it here by letting IP
8126                                          * fragment it for now and printing
8127                                          * a warning. This really should not
8128                                          * happen ...
8129                                          */
8130                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8131                                             chk->send_size, mtu);
8132                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8133                                 }
8134                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8135                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8136                                         struct sctp_data_chunk *dchkh;
8137
8138                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8139                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8140                                 }
8141                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8142                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8143                                         /* ok we will add this one */
8144
8145                                         /*
8146                                          * Add an AUTH chunk, if chunk
8147                                          * requires it, save the offset into
8148                                          * the chain for AUTH
8149                                          */
8150                                         if (data_auth_reqd) {
8151                                                 if (auth == NULL) {
8152                                                         outchain = sctp_add_auth_chunk(outchain,
8153                                                             &endoutchain,
8154                                                             &auth,
8155                                                             &auth_offset,
8156                                                             stcb,
8157                                                             SCTP_DATA);
8158                                                         auth_keyid = chk->auth_keyid;
8159                                                         override_ok = 0;
8160                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8161                                                 } else if (override_ok) {
8162                                                         /*
8163                                                          * use this data's
8164                                                          * keyid
8165                                                          */
8166                                                         auth_keyid = chk->auth_keyid;
8167                                                         override_ok = 0;
8168                                                 } else if (auth_keyid != chk->auth_keyid) {
8169                                                         /*
8170                                                          * different keyid,
8171                                                          * so done bundling
8172                                                          */
8173                                                         break;
8174                                                 }
8175                                         }
8176                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8177                                             chk->send_size, chk->copy_by_ref);
8178                                         if (outchain == NULL) {
8179                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8180                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8181                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8182                                                 }
8183                                                 *reason_code = 3;
8184                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8185                                                 return (ENOMEM);
8186                                         }
8187                                         /* upate our MTU size */
8188                                         /* Do clear IP_DF ? */
8189                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8190                                                 no_fragmentflg = 0;
8191                                         }
8192                                         /* unsigned subtraction of mtu */
8193                                         if (mtu > chk->send_size)
8194                                                 mtu -= chk->send_size;
8195                                         else
8196                                                 mtu = 0;
8197                                         /* unsigned subtraction of r_mtu */
8198                                         if (r_mtu > chk->send_size)
8199                                                 r_mtu -= chk->send_size;
8200                                         else
8201                                                 r_mtu = 0;
8202
8203                                         to_out += chk->send_size;
8204                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8205 #ifdef INVARIANTS
8206                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8207 #else
8208                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8209                                                     mx_mtu, to_out);
8210 #endif
8211                                         }
8212                                         chk->window_probe = 0;
8213                                         data_list[bundle_at++] = chk;
8214                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8215                                                 mtu = 0;
8216                                                 break;
8217                                         }
8218                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8219                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8220                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8221                                                 } else {
8222                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8223                                                 }
8224                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8225                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8226                                                         /*
8227                                                          * Count number of
8228                                                          * user msg's that
8229                                                          * were fragmented
8230                                                          * we do this by
8231                                                          * counting when we
8232                                                          * see a LAST
8233                                                          * fragment only.
8234                                                          */
8235                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8236                                         }
8237                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8238                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8239                                                         data_list[0]->window_probe = 1;
8240                                                         net->window_probe = 1;
8241                                                 }
8242                                                 break;
8243                                         }
8244                                 } else {
8245                                         /*
8246                                          * Must be sent in order of the
8247                                          * TSN's (on a network)
8248                                          */
8249                                         break;
8250                                 }
8251                         }       /* for (chunk gather loop for this net) */
8252                 }               /* if asoc.state OPEN */
8253 no_data_fill:
8254                 /* Is there something to send for this destination? */
8255                 if (outchain) {
8256                         /* We may need to start a control timer or two */
8257                         if (asconf) {
8258                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8259                                     stcb, net);
8260                                 /*
8261                                  * do NOT clear the asconf flag as it is
8262                                  * used to do appropriate source address
8263                                  * selection.
8264                                  */
8265                         }
8266                         if (cookie) {
8267                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8268                                 cookie = 0;
8269                         }
8270                         /* must start a send timer if data is being sent */
8271                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8272                                 /*
8273                                  * no timer running on this destination
8274                                  * restart it.
8275                                  */
8276                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8277                         } else if ((asoc->sctp_cmt_on_off == 1) &&
8278                                     (asoc->sctp_cmt_pf > 0) &&
8279                                     pf_hbflag &&
8280                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8281                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8282                                 /*
8283                                  * JRS 5/14/07 - If a HB has been sent to a
8284                                  * PF destination and no T3 timer is
8285                                  * currently running, start the T3 timer to
8286                                  * track the HBs that were sent.
8287                                  */
8288                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8289                         }
8290                         /* Now send it, if there is anything to send :> */
8291                         if ((error = sctp_lowlevel_chunk_output(inp,
8292                             stcb,
8293                             net,
8294                             (struct sockaddr *)&net->ro._l_addr,
8295                             outchain,
8296                             auth_offset,
8297                             auth,
8298                             auth_keyid,
8299                             no_fragmentflg,
8300                             bundle_at,
8301                             data_list[0],
8302                             asconf,
8303                             inp->sctp_lport, stcb->rport,
8304                             htonl(stcb->asoc.peer_vtag),
8305                             net->port, so_locked, NULL))) {
8306                                 /* error, we could not output */
8307                                 if (error == ENOBUFS) {
8308                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8309                                         asoc->ifp_had_enobuf = 1;
8310                                 }
8311                                 if (from_where == 0) {
8312                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8313                                 }
8314                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8315                                 if (hbflag) {
8316                                         if (*now_filled == 0) {
8317                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8318                                                 *now_filled = 1;
8319                                                 *now = net->last_sent_time;
8320                                         } else {
8321                                                 net->last_sent_time = *now;
8322                                         }
8323                                         hbflag = 0;
8324                                 }
8325                                 if (error == EHOSTUNREACH) {
8326                                         /*
8327                                          * Destination went unreachable
8328                                          * during this send
8329                                          */
8330                                         sctp_move_chunks_from_net(stcb, net);
8331                                 }
8332                                 *reason_code = 6;
8333                                 /*-
8334                                  * I add this line to be paranoid. As far as
8335                                  * I can tell the continue, takes us back to
8336                                  * the top of the for, but just to make sure
8337                                  * I will reset these again here.
8338                                  */
8339                                 ctl_cnt = bundle_at = 0;
8340                                 continue;       /* This takes us back to the
8341                                                  * for() for the nets. */
8342                         } else {
8343                                 asoc->ifp_had_enobuf = 0;
8344                         }
8345                         outchain = endoutchain = NULL;
8346                         auth = NULL;
8347                         auth_offset = 0;
8348                         if (bundle_at || hbflag) {
8349                                 /* For data/asconf and hb set time */
8350                                 if (*now_filled == 0) {
8351                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8352                                         *now_filled = 1;
8353                                         *now = net->last_sent_time;
8354                                 } else {
8355                                         net->last_sent_time = *now;
8356                                 }
8357                         }
8358                         if (!no_out_cnt) {
8359                                 *num_out += (ctl_cnt + bundle_at);
8360                         }
8361                         if (bundle_at) {
8362                                 /* setup for a RTO measurement */
8363                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8364                                 /* fill time if not already filled */
8365                                 if (*now_filled == 0) {
8366                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8367                                         *now_filled = 1;
8368                                         *now = asoc->time_last_sent;
8369                                 } else {
8370                                         asoc->time_last_sent = *now;
8371                                 }
8372                                 data_list[0]->do_rtt = 1;
8373                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8374                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8375                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8376                                         if (net->flight_size < net->cwnd) {
8377                                                 /* start or restart it */
8378                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8379                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8380                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8381                                                 }
8382                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8383                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8384                                         } else {
8385                                                 /* stop it if its running */
8386                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8387                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8388                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8389                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8390                                                 }
8391                                         }
8392                                 }
8393                         }
8394                         if (one_chunk) {
8395                                 break;
8396                         }
8397                 }
8398                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8399                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8400                 }
8401         }
8402         if (old_start_at == NULL) {
8403                 old_start_at = start_at;
8404                 start_at = TAILQ_FIRST(&asoc->nets);
8405                 if (old_start_at)
8406                         goto again_one_more_time;
8407         }
8408         /*
8409          * At the end there should be no NON timed chunks hanging on this
8410          * queue.
8411          */
8412         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8413                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8414         }
8415         if ((*num_out == 0) && (*reason_code == 0)) {
8416                 *reason_code = 4;
8417         } else {
8418                 *reason_code = 5;
8419         }
8420         sctp_clean_up_ctl(stcb, asoc);
8421         return (0);
8422 }
8423
8424 void
8425 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8426 {
8427         /*-
8428          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8429          * the control chunk queue.
8430          */
8431         struct sctp_chunkhdr *hdr;
8432         struct sctp_tmit_chunk *chk;
8433         struct mbuf *mat;
8434
8435         SCTP_TCB_LOCK_ASSERT(stcb);
8436         sctp_alloc_a_chunk(stcb, chk);
8437         if (chk == NULL) {
8438                 /* no memory */
8439                 sctp_m_freem(op_err);
8440                 return;
8441         }
8442         chk->copy_by_ref = 0;
8443         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8444         if (op_err == NULL) {
8445                 sctp_free_a_chunk(stcb, chk);
8446                 return;
8447         }
8448         chk->send_size = 0;
8449         mat = op_err;
8450         while (mat != NULL) {
8451                 chk->send_size += SCTP_BUF_LEN(mat);
8452                 mat = SCTP_BUF_NEXT(mat);
8453         }
8454         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8455         chk->rec.chunk_id.can_take_data = 1;
8456         chk->sent = SCTP_DATAGRAM_UNSENT;
8457         chk->snd_count = 0;
8458         chk->flags = 0;
8459         chk->asoc = &stcb->asoc;
8460         chk->data = op_err;
8461         chk->whoTo = chk->asoc->primary_destination;
8462         atomic_add_int(&chk->whoTo->ref_count, 1);
8463         hdr = mtod(op_err, struct sctp_chunkhdr *);
8464         hdr->chunk_type = SCTP_OPERATION_ERROR;
8465         hdr->chunk_flags = 0;
8466         hdr->chunk_length = htons(chk->send_size);
8467         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8468             chk,
8469             sctp_next);
8470         chk->asoc->ctrl_queue_cnt++;
8471 }
8472
8473 int
8474 sctp_send_cookie_echo(struct mbuf *m,
8475     int offset,
8476     struct sctp_tcb *stcb,
8477     struct sctp_nets *net)
8478 {
8479         /*-
8480          * pull out the cookie and put it at the front of the control chunk
8481          * queue.
8482          */
8483         int at;
8484         struct mbuf *cookie;
8485         struct sctp_paramhdr parm, *phdr;
8486         struct sctp_chunkhdr *hdr;
8487         struct sctp_tmit_chunk *chk;
8488         uint16_t ptype, plen;
8489
8490         /* First find the cookie in the param area */
8491         cookie = NULL;
8492         at = offset + sizeof(struct sctp_init_chunk);
8493
8494         SCTP_TCB_LOCK_ASSERT(stcb);
8495         do {
8496                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8497                 if (phdr == NULL) {
8498                         return (-3);
8499                 }
8500                 ptype = ntohs(phdr->param_type);
8501                 plen = ntohs(phdr->param_length);
8502                 if (ptype == SCTP_STATE_COOKIE) {
8503                         int pad;
8504
8505                         /* found the cookie */
8506                         if ((pad = (plen % 4))) {
8507                                 plen += 4 - pad;
8508                         }
8509                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8510                         if (cookie == NULL) {
8511                                 /* No memory */
8512                                 return (-2);
8513                         }
8514 #ifdef SCTP_MBUF_LOGGING
8515                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8516                                 struct mbuf *mat;
8517
8518                                 mat = cookie;
8519                                 while (mat) {
8520                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8521                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8522                                         }
8523                                         mat = SCTP_BUF_NEXT(mat);
8524                                 }
8525                         }
8526 #endif
8527                         break;
8528                 }
8529                 at += SCTP_SIZE32(plen);
8530         } while (phdr);
8531         if (cookie == NULL) {
8532                 /* Did not find the cookie */
8533                 return (-3);
8534         }
8535         /* ok, we got the cookie lets change it into a cookie echo chunk */
8536
8537         /* first the change from param to cookie */
8538         hdr = mtod(cookie, struct sctp_chunkhdr *);
8539         hdr->chunk_type = SCTP_COOKIE_ECHO;
8540         hdr->chunk_flags = 0;
8541         /* get the chunk stuff now and place it in the FRONT of the queue */
8542         sctp_alloc_a_chunk(stcb, chk);
8543         if (chk == NULL) {
8544                 /* no memory */
8545                 sctp_m_freem(cookie);
8546                 return (-5);
8547         }
8548         chk->copy_by_ref = 0;
8549         chk->send_size = plen;
8550         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8551         chk->rec.chunk_id.can_take_data = 0;
8552         chk->sent = SCTP_DATAGRAM_UNSENT;
8553         chk->snd_count = 0;
8554         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8555         chk->asoc = &stcb->asoc;
8556         chk->data = cookie;
8557         chk->whoTo = chk->asoc->primary_destination;
8558         atomic_add_int(&chk->whoTo->ref_count, 1);
8559         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8560         chk->asoc->ctrl_queue_cnt++;
8561         return (0);
8562 }
8563
8564 void
8565 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8566     struct mbuf *m,
8567     int offset,
8568     int chk_length,
8569     struct sctp_nets *net)
8570 {
8571         /*
8572          * take a HB request and make it into a HB ack and send it.
8573          */
8574         struct mbuf *outchain;
8575         struct sctp_chunkhdr *chdr;
8576         struct sctp_tmit_chunk *chk;
8577
8578
8579         if (net == NULL)
8580                 /* must have a net pointer */
8581                 return;
8582
8583         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8584         if (outchain == NULL) {
8585                 /* gak out of memory */
8586                 return;
8587         }
8588 #ifdef SCTP_MBUF_LOGGING
8589         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8590                 struct mbuf *mat;
8591
8592                 mat = outchain;
8593                 while (mat) {
8594                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8595                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8596                         }
8597                         mat = SCTP_BUF_NEXT(mat);
8598                 }
8599         }
8600 #endif
8601         chdr = mtod(outchain, struct sctp_chunkhdr *);
8602         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8603         chdr->chunk_flags = 0;
8604         if (chk_length % 4) {
8605                 /* need pad */
8606                 uint32_t cpthis = 0;
8607                 int padlen;
8608
8609                 padlen = 4 - (chk_length % 4);
8610                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8611         }
8612         sctp_alloc_a_chunk(stcb, chk);
8613         if (chk == NULL) {
8614                 /* no memory */
8615                 sctp_m_freem(outchain);
8616                 return;
8617         }
8618         chk->copy_by_ref = 0;
8619         chk->send_size = chk_length;
8620         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8621         chk->rec.chunk_id.can_take_data = 1;
8622         chk->sent = SCTP_DATAGRAM_UNSENT;
8623         chk->snd_count = 0;
8624         chk->flags = 0;
8625         chk->asoc = &stcb->asoc;
8626         chk->data = outchain;
8627         chk->whoTo = net;
8628         atomic_add_int(&chk->whoTo->ref_count, 1);
8629         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8630         chk->asoc->ctrl_queue_cnt++;
8631 }
8632
8633 void
8634 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8635 {
8636         /* formulate and queue a cookie-ack back to sender */
8637         struct mbuf *cookie_ack;
8638         struct sctp_chunkhdr *hdr;
8639         struct sctp_tmit_chunk *chk;
8640
8641         cookie_ack = NULL;
8642         SCTP_TCB_LOCK_ASSERT(stcb);
8643
8644         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8645         if (cookie_ack == NULL) {
8646                 /* no mbuf's */
8647                 return;
8648         }
8649         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8650         sctp_alloc_a_chunk(stcb, chk);
8651         if (chk == NULL) {
8652                 /* no memory */
8653                 sctp_m_freem(cookie_ack);
8654                 return;
8655         }
8656         chk->copy_by_ref = 0;
8657         chk->send_size = sizeof(struct sctp_chunkhdr);
8658         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8659         chk->rec.chunk_id.can_take_data = 1;
8660         chk->sent = SCTP_DATAGRAM_UNSENT;
8661         chk->snd_count = 0;
8662         chk->flags = 0;
8663         chk->asoc = &stcb->asoc;
8664         chk->data = cookie_ack;
8665         if (chk->asoc->last_control_chunk_from != NULL) {
8666                 chk->whoTo = chk->asoc->last_control_chunk_from;
8667         } else {
8668                 chk->whoTo = chk->asoc->primary_destination;
8669         }
8670         atomic_add_int(&chk->whoTo->ref_count, 1);
8671         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8672         hdr->chunk_type = SCTP_COOKIE_ACK;
8673         hdr->chunk_flags = 0;
8674         hdr->chunk_length = htons(chk->send_size);
8675         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8676         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8677         chk->asoc->ctrl_queue_cnt++;
8678         return;
8679 }
8680
8681
8682 void
8683 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8684 {
8685         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8686         struct mbuf *m_shutdown_ack;
8687         struct sctp_shutdown_ack_chunk *ack_cp;
8688         struct sctp_tmit_chunk *chk;
8689
8690         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8691         if (m_shutdown_ack == NULL) {
8692                 /* no mbuf's */
8693                 return;
8694         }
8695         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8696         sctp_alloc_a_chunk(stcb, chk);
8697         if (chk == NULL) {
8698                 /* no memory */
8699                 sctp_m_freem(m_shutdown_ack);
8700                 return;
8701         }
8702         chk->copy_by_ref = 0;
8703         chk->send_size = sizeof(struct sctp_chunkhdr);
8704         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8705         chk->rec.chunk_id.can_take_data = 1;
8706         chk->sent = SCTP_DATAGRAM_UNSENT;
8707         chk->snd_count = 0;
8708         chk->flags = 0;
8709         chk->asoc = &stcb->asoc;
8710         chk->data = m_shutdown_ack;
8711         chk->whoTo = net;
8712         atomic_add_int(&net->ref_count, 1);
8713
8714         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8715         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8716         ack_cp->ch.chunk_flags = 0;
8717         ack_cp->ch.chunk_length = htons(chk->send_size);
8718         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8719         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8720         chk->asoc->ctrl_queue_cnt++;
8721         return;
8722 }
8723
8724 void
8725 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8726 {
8727         /* formulate and queue a SHUTDOWN to the sender */
8728         struct mbuf *m_shutdown;
8729         struct sctp_shutdown_chunk *shutdown_cp;
8730         struct sctp_tmit_chunk *chk;
8731
8732         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8733         if (m_shutdown == NULL) {
8734                 /* no mbuf's */
8735                 return;
8736         }
8737         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8738         sctp_alloc_a_chunk(stcb, chk);
8739         if (chk == NULL) {
8740                 /* no memory */
8741                 sctp_m_freem(m_shutdown);
8742                 return;
8743         }
8744         chk->copy_by_ref = 0;
8745         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8746         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8747         chk->rec.chunk_id.can_take_data = 1;
8748         chk->sent = SCTP_DATAGRAM_UNSENT;
8749         chk->snd_count = 0;
8750         chk->flags = 0;
8751         chk->asoc = &stcb->asoc;
8752         chk->data = m_shutdown;
8753         chk->whoTo = net;
8754         atomic_add_int(&net->ref_count, 1);
8755
8756         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8757         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8758         shutdown_cp->ch.chunk_flags = 0;
8759         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8760         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8761         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8762         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8763         chk->asoc->ctrl_queue_cnt++;
8764         return;
8765 }
8766
8767 void
8768 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8769 {
8770         /*
8771          * formulate and queue an ASCONF to the peer. ASCONF parameters
8772          * should be queued on the assoc queue.
8773          */
8774         struct sctp_tmit_chunk *chk;
8775         struct mbuf *m_asconf;
8776         int len;
8777
8778         SCTP_TCB_LOCK_ASSERT(stcb);
8779
8780         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8781             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8782                 /* can't send a new one if there is one in flight already */
8783                 return;
8784         }
8785         /* compose an ASCONF chunk, maximum length is PMTU */
8786         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8787         if (m_asconf == NULL) {
8788                 return;
8789         }
8790         sctp_alloc_a_chunk(stcb, chk);
8791         if (chk == NULL) {
8792                 /* no memory */
8793                 sctp_m_freem(m_asconf);
8794                 return;
8795         }
8796         chk->copy_by_ref = 0;
8797         chk->data = m_asconf;
8798         chk->send_size = len;
8799         chk->rec.chunk_id.id = SCTP_ASCONF;
8800         chk->rec.chunk_id.can_take_data = 0;
8801         chk->sent = SCTP_DATAGRAM_UNSENT;
8802         chk->snd_count = 0;
8803         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8804         chk->asoc = &stcb->asoc;
8805         chk->whoTo = net;
8806         atomic_add_int(&chk->whoTo->ref_count, 1);
8807         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8808         chk->asoc->ctrl_queue_cnt++;
8809         return;
8810 }
8811
8812 void
8813 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8814 {
8815         /*
8816          * formulate and queue a asconf-ack back to sender. the asconf-ack
8817          * must be stored in the tcb.
8818          */
8819         struct sctp_tmit_chunk *chk;
8820         struct sctp_asconf_ack *ack, *latest_ack;
8821         struct mbuf *m_ack, *m;
8822         struct sctp_nets *net = NULL;
8823
8824         SCTP_TCB_LOCK_ASSERT(stcb);
8825         /* Get the latest ASCONF-ACK */
8826         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8827         if (latest_ack == NULL) {
8828                 return;
8829         }
8830         if (latest_ack->last_sent_to != NULL &&
8831             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8832                 /* we're doing a retransmission */
8833                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8834                 if (net == NULL) {
8835                         /* no alternate */
8836                         if (stcb->asoc.last_control_chunk_from == NULL)
8837                                 net = stcb->asoc.primary_destination;
8838                         else
8839                                 net = stcb->asoc.last_control_chunk_from;
8840                 }
8841         } else {
8842                 /* normal case */
8843                 if (stcb->asoc.last_control_chunk_from == NULL)
8844                         net = stcb->asoc.primary_destination;
8845                 else
8846                         net = stcb->asoc.last_control_chunk_from;
8847         }
8848         latest_ack->last_sent_to = net;
8849
8850         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8851                 if (ack->data == NULL) {
8852                         continue;
8853                 }
8854                 /* copy the asconf_ack */
8855                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8856                 if (m_ack == NULL) {
8857                         /* couldn't copy it */
8858                         return;
8859                 }
8860 #ifdef SCTP_MBUF_LOGGING
8861                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8862                         struct mbuf *mat;
8863
8864                         mat = m_ack;
8865                         while (mat) {
8866                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8867                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8868                                 }
8869                                 mat = SCTP_BUF_NEXT(mat);
8870                         }
8871                 }
8872 #endif
8873
8874                 sctp_alloc_a_chunk(stcb, chk);
8875                 if (chk == NULL) {
8876                         /* no memory */
8877                         if (m_ack)
8878                                 sctp_m_freem(m_ack);
8879                         return;
8880                 }
8881                 chk->copy_by_ref = 0;
8882
8883                 chk->whoTo = net;
8884                 chk->data = m_ack;
8885                 chk->send_size = 0;
8886                 /* Get size */
8887                 m = m_ack;
8888                 chk->send_size = ack->len;
8889                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8890                 chk->rec.chunk_id.can_take_data = 1;
8891                 chk->sent = SCTP_DATAGRAM_UNSENT;
8892                 chk->snd_count = 0;
8893                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8894                 chk->asoc = &stcb->asoc;
8895                 atomic_add_int(&chk->whoTo->ref_count, 1);
8896
8897                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8898                 chk->asoc->ctrl_queue_cnt++;
8899         }
8900         return;
8901 }
8902
8903
8904 static int
8905 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8906     struct sctp_tcb *stcb,
8907     struct sctp_association *asoc,
8908     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8909 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8910     SCTP_UNUSED
8911 #endif
8912 )
8913 {
8914         /*-
8915          * send out one MTU of retransmission. If fast_retransmit is
8916          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8917          * rwnd. For a Cookie or Asconf in the control chunk queue we
8918          * retransmit them by themselves.
8919          *
8920          * For data chunks we will pick out the lowest TSN's in the sent_queue
8921          * marked for resend and bundle them all together (up to a MTU of
8922          * destination). The address to send to should have been
8923          * selected/changed where the retransmission was marked (i.e. in FR
8924          * or t3-timeout routines).
8925          */
8926         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8927         struct sctp_tmit_chunk *chk, *fwd;
8928         struct mbuf *m, *endofchain;
8929         struct sctp_nets *net = NULL;
8930         uint32_t tsns_sent = 0;
8931         int no_fragmentflg, bundle_at, cnt_thru;
8932         unsigned int mtu;
8933         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8934         struct sctp_auth_chunk *auth = NULL;
8935         uint32_t auth_offset = 0;
8936         uint16_t auth_keyid;
8937         int override_ok = 1;
8938         int data_auth_reqd = 0;
8939         uint32_t dmtu = 0;
8940
8941         SCTP_TCB_LOCK_ASSERT(stcb);
8942         tmr_started = ctl_cnt = bundle_at = error = 0;
8943         no_fragmentflg = 1;
8944         fwd_tsn = 0;
8945         *cnt_out = 0;
8946         fwd = NULL;
8947         endofchain = m = NULL;
8948         auth_keyid = stcb->asoc.authinfo.active_keyid;
8949 #ifdef SCTP_AUDITING_ENABLED
8950         sctp_audit_log(0xC3, 1);
8951 #endif
8952         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8953             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8954                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8955                     asoc->sent_queue_retran_cnt);
8956                 asoc->sent_queue_cnt = 0;
8957                 asoc->sent_queue_cnt_removeable = 0;
8958                 /* send back 0/0 so we enter normal transmission */
8959                 *cnt_out = 0;
8960                 return (0);
8961         }
8962         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8963                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8964                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8965                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8966                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8967                                 continue;
8968                         }
8969                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8970                                 if (chk != asoc->str_reset) {
8971                                         /*
8972                                          * not eligible for retran if its
8973                                          * not ours
8974                                          */
8975                                         continue;
8976                                 }
8977                         }
8978                         ctl_cnt++;
8979                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8980                                 fwd_tsn = 1;
8981                                 fwd = chk;
8982                         }
8983                         /*
8984                          * Add an AUTH chunk, if chunk requires it save the
8985                          * offset into the chain for AUTH
8986                          */
8987                         if ((auth == NULL) &&
8988                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8989                             stcb->asoc.peer_auth_chunks))) {
8990                                 m = sctp_add_auth_chunk(m, &endofchain,
8991                                     &auth, &auth_offset,
8992                                     stcb,
8993                                     chk->rec.chunk_id.id);
8994                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8995                         }
8996                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8997                         break;
8998                 }
8999         }
9000         one_chunk = 0;
9001         cnt_thru = 0;
9002         /* do we have control chunks to retransmit? */
9003         if (m != NULL) {
9004                 /* Start a timer no matter if we suceed or fail */
9005                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9006                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9007                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9008                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9009                 chk->snd_count++;       /* update our count */
9010                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9011                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9012                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9013                     no_fragmentflg, 0, NULL, 0,
9014                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9015                     chk->whoTo->port, so_locked, NULL))) {
9016                         SCTP_STAT_INCR(sctps_lowlevelerr);
9017                         return (error);
9018                 }
9019                 m = endofchain = NULL;
9020                 auth = NULL;
9021                 auth_offset = 0;
9022                 /*
9023                  * We don't want to mark the net->sent time here since this
9024                  * we use this for HB and retrans cannot measure RTT
9025                  */
9026                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9027                 *cnt_out += 1;
9028                 chk->sent = SCTP_DATAGRAM_SENT;
9029                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9030                 if (fwd_tsn == 0) {
9031                         return (0);
9032                 } else {
9033                         /* Clean up the fwd-tsn list */
9034                         sctp_clean_up_ctl(stcb, asoc);
9035                         return (0);
9036                 }
9037         }
9038         /*
9039          * Ok, it is just data retransmission we need to do or that and a
9040          * fwd-tsn with it all.
9041          */
9042         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9043                 return (SCTP_RETRAN_DONE);
9044         }
9045         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9046             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9047                 /* not yet open, resend the cookie and that is it */
9048                 return (1);
9049         }
9050 #ifdef SCTP_AUDITING_ENABLED
9051         sctp_auditing(20, inp, stcb, NULL);
9052 #endif
9053         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9054         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9055                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9056                         /* No, not sent to this net or not ready for rtx */
9057                         continue;
9058                 }
9059                 if (chk->data == NULL) {
9060                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9061                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9062                         continue;
9063                 }
9064                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9065                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9066                         /* Gak, we have exceeded max unlucky retran, abort! */
9067                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9068                             chk->snd_count,
9069                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9070                         atomic_add_int(&stcb->asoc.refcnt, 1);
9071                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9072                         SCTP_TCB_LOCK(stcb);
9073                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9074                         return (SCTP_RETRAN_EXIT);
9075                 }
9076                 /* pick up the net */
9077                 net = chk->whoTo;
9078                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9079                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9080                 } else {
9081                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9082                 }
9083
9084                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9085                         /* No room in peers rwnd */
9086                         uint32_t tsn;
9087
9088                         tsn = asoc->last_acked_seq + 1;
9089                         if (tsn == chk->rec.data.TSN_seq) {
9090                                 /*
9091                                  * we make a special exception for this
9092                                  * case. The peer has no rwnd but is missing
9093                                  * the lowest chunk.. which is probably what
9094                                  * is holding up the rwnd.
9095                                  */
9096                                 goto one_chunk_around;
9097                         }
9098                         return (1);
9099                 }
9100 one_chunk_around:
9101                 if (asoc->peers_rwnd < mtu) {
9102                         one_chunk = 1;
9103                         if ((asoc->peers_rwnd == 0) &&
9104                             (asoc->total_flight == 0)) {
9105                                 chk->window_probe = 1;
9106                                 chk->whoTo->window_probe = 1;
9107                         }
9108                 }
9109 #ifdef SCTP_AUDITING_ENABLED
9110                 sctp_audit_log(0xC3, 2);
9111 #endif
9112                 bundle_at = 0;
9113                 m = NULL;
9114                 net->fast_retran_ip = 0;
9115                 if (chk->rec.data.doing_fast_retransmit == 0) {
9116                         /*
9117                          * if no FR in progress skip destination that have
9118                          * flight_size > cwnd.
9119                          */
9120                         if (net->flight_size >= net->cwnd) {
9121                                 continue;
9122                         }
9123                 } else {
9124                         /*
9125                          * Mark the destination net to have FR recovery
9126                          * limits put on it.
9127                          */
9128                         *fr_done = 1;
9129                         net->fast_retran_ip = 1;
9130                 }
9131
9132                 /*
9133                  * if no AUTH is yet included and this chunk requires it,
9134                  * make sure to account for it.  We don't apply the size
9135                  * until the AUTH chunk is actually added below in case
9136                  * there is no room for this chunk.
9137                  */
9138                 if (data_auth_reqd && (auth == NULL)) {
9139                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9140                 } else
9141                         dmtu = 0;
9142
9143                 if ((chk->send_size <= (mtu - dmtu)) ||
9144                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9145                         /* ok we will add this one */
9146                         if (data_auth_reqd) {
9147                                 if (auth == NULL) {
9148                                         m = sctp_add_auth_chunk(m,
9149                                             &endofchain,
9150                                             &auth,
9151                                             &auth_offset,
9152                                             stcb,
9153                                             SCTP_DATA);
9154                                         auth_keyid = chk->auth_keyid;
9155                                         override_ok = 0;
9156                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9157                                 } else if (override_ok) {
9158                                         auth_keyid = chk->auth_keyid;
9159                                         override_ok = 0;
9160                                 } else if (chk->auth_keyid != auth_keyid) {
9161                                         /* different keyid, so done bundling */
9162                                         break;
9163                                 }
9164                         }
9165                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9166                         if (m == NULL) {
9167                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9168                                 return (ENOMEM);
9169                         }
9170                         /* Do clear IP_DF ? */
9171                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9172                                 no_fragmentflg = 0;
9173                         }
9174                         /* upate our MTU size */
9175                         if (mtu > (chk->send_size + dmtu))
9176                                 mtu -= (chk->send_size + dmtu);
9177                         else
9178                                 mtu = 0;
9179                         data_list[bundle_at++] = chk;
9180                         if (one_chunk && (asoc->total_flight <= 0)) {
9181                                 SCTP_STAT_INCR(sctps_windowprobed);
9182                         }
9183                 }
9184                 if (one_chunk == 0) {
9185                         /*
9186                          * now are there anymore forward from chk to pick
9187                          * up?
9188                          */
9189                         fwd = TAILQ_NEXT(chk, sctp_next);
9190                         while (fwd) {
9191                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9192                                         /* Nope, not for retran */
9193                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9194                                         continue;
9195                                 }
9196                                 if (fwd->whoTo != net) {
9197                                         /* Nope, not the net in question */
9198                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9199                                         continue;
9200                                 }
9201                                 if (data_auth_reqd && (auth == NULL)) {
9202                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9203                                 } else
9204                                         dmtu = 0;
9205                                 if (fwd->send_size <= (mtu - dmtu)) {
9206                                         if (data_auth_reqd) {
9207                                                 if (auth == NULL) {
9208                                                         m = sctp_add_auth_chunk(m,
9209                                                             &endofchain,
9210                                                             &auth,
9211                                                             &auth_offset,
9212                                                             stcb,
9213                                                             SCTP_DATA);
9214                                                         auth_keyid = fwd->auth_keyid;
9215                                                         override_ok = 0;
9216                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9217                                                 } else if (override_ok) {
9218                                                         auth_keyid = fwd->auth_keyid;
9219                                                         override_ok = 0;
9220                                                 } else if (fwd->auth_keyid != auth_keyid) {
9221                                                         /*
9222                                                          * different keyid,
9223                                                          * so done bundling
9224                                                          */
9225                                                         break;
9226                                                 }
9227                                         }
9228                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9229                                         if (m == NULL) {
9230                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9231                                                 return (ENOMEM);
9232                                         }
9233                                         /* Do clear IP_DF ? */
9234                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9235                                                 no_fragmentflg = 0;
9236                                         }
9237                                         /* upate our MTU size */
9238                                         if (mtu > (fwd->send_size + dmtu))
9239                                                 mtu -= (fwd->send_size + dmtu);
9240                                         else
9241                                                 mtu = 0;
9242                                         data_list[bundle_at++] = fwd;
9243                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9244                                                 break;
9245                                         }
9246                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9247                                 } else {
9248                                         /* can't fit so we are done */
9249                                         break;
9250                                 }
9251                         }
9252                 }
9253                 /* Is there something to send for this destination? */
9254                 if (m) {
9255                         /*
9256                          * No matter if we fail/or suceed we should start a
9257                          * timer. A failure is like a lost IP packet :-)
9258                          */
9259                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9260                                 /*
9261                                  * no timer running on this destination
9262                                  * restart it.
9263                                  */
9264                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9265                                 tmr_started = 1;
9266                         }
9267                         /* Now lets send it, if there is anything to send :> */
9268                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9269                             (struct sockaddr *)&net->ro._l_addr, m,
9270                             auth_offset, auth, auth_keyid,
9271                             no_fragmentflg, 0, NULL, 0,
9272                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9273                             net->port, so_locked, NULL))) {
9274                                 /* error, we could not output */
9275                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9276                                 return (error);
9277                         }
9278                         m = endofchain = NULL;
9279                         auth = NULL;
9280                         auth_offset = 0;
9281                         /* For HB's */
9282                         /*
9283                          * We don't want to mark the net->sent time here
9284                          * since this we use this for HB and retrans cannot
9285                          * measure RTT
9286                          */
9287                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9288
9289                         /* For auto-close */
9290                         cnt_thru++;
9291                         if (*now_filled == 0) {
9292                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9293                                 *now = asoc->time_last_sent;
9294                                 *now_filled = 1;
9295                         } else {
9296                                 asoc->time_last_sent = *now;
9297                         }
9298                         *cnt_out += bundle_at;
9299 #ifdef SCTP_AUDITING_ENABLED
9300                         sctp_audit_log(0xC4, bundle_at);
9301 #endif
9302                         if (bundle_at) {
9303                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9304                         }
9305                         for (i = 0; i < bundle_at; i++) {
9306                                 SCTP_STAT_INCR(sctps_sendretransdata);
9307                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9308                                 /*
9309                                  * When we have a revoked data, and we
9310                                  * retransmit it, then we clear the revoked
9311                                  * flag since this flag dictates if we
9312                                  * subtracted from the fs
9313                                  */
9314                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9315                                         /* Deflate the cwnd */
9316                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9317                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9318                                 }
9319                                 data_list[i]->snd_count++;
9320                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9321                                 /* record the time */
9322                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9323                                 if (data_list[i]->book_size_scale) {
9324                                         /*
9325                                          * need to double the book size on
9326                                          * this one
9327                                          */
9328                                         data_list[i]->book_size_scale = 0;
9329                                         /*
9330                                          * Since we double the booksize, we
9331                                          * must also double the output queue
9332                                          * size, since this get shrunk when
9333                                          * we free by this amount.
9334                                          */
9335                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9336                                         data_list[i]->book_size *= 2;
9337
9338
9339                                 } else {
9340                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9341                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9342                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9343                                         }
9344                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9345                                             (uint32_t) (data_list[i]->send_size +
9346                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9347                                 }
9348                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9349                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9350                                             data_list[i]->whoTo->flight_size,
9351                                             data_list[i]->book_size,
9352                                             (uintptr_t) data_list[i]->whoTo,
9353                                             data_list[i]->rec.data.TSN_seq);
9354                                 }
9355                                 sctp_flight_size_increase(data_list[i]);
9356                                 sctp_total_flight_increase(stcb, data_list[i]);
9357                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9358                                         /* SWS sender side engages */
9359                                         asoc->peers_rwnd = 0;
9360                                 }
9361                                 if ((i == 0) &&
9362                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9363                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9364                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9365                                             (tmr_started == 0)) {
9366                                                 /*-
9367                                                  * ok we just fast-retrans'd
9368                                                  * the lowest TSN, i.e the
9369                                                  * first on the list. In
9370                                                  * this case we want to give
9371                                                  * some more time to get a
9372                                                  * SACK back without a
9373                                                  * t3-expiring.
9374                                                  */
9375                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9376                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9377                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9378                                         }
9379                                 }
9380                         }
9381                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9382                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9383                         }
9384 #ifdef SCTP_AUDITING_ENABLED
9385                         sctp_auditing(21, inp, stcb, NULL);
9386 #endif
9387                 } else {
9388                         /* None will fit */
9389                         return (1);
9390                 }
9391                 if (asoc->sent_queue_retran_cnt <= 0) {
9392                         /* all done we have no more to retran */
9393                         asoc->sent_queue_retran_cnt = 0;
9394                         break;
9395                 }
9396                 if (one_chunk) {
9397                         /* No more room in rwnd */
9398                         return (1);
9399                 }
9400                 /* stop the for loop here. we sent out a packet */
9401                 break;
9402         }
9403         return (0);
9404 }
9405
9406
9407 static int
9408 sctp_timer_validation(struct sctp_inpcb *inp,
9409     struct sctp_tcb *stcb,
9410     struct sctp_association *asoc,
9411     int ret)
9412 {
9413         struct sctp_nets *net;
9414
9415         /* Validate that a timer is running somewhere */
9416         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9417                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9418                         /* Here is a timer */
9419                         return (ret);
9420                 }
9421         }
9422         SCTP_TCB_LOCK_ASSERT(stcb);
9423         /* Gak, we did not have a timer somewhere */
9424         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9425         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9426         return (ret);
9427 }
9428
9429 void
9430 sctp_chunk_output(struct sctp_inpcb *inp,
9431     struct sctp_tcb *stcb,
9432     int from_where,
9433     int so_locked
9434 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9435     SCTP_UNUSED
9436 #endif
9437 )
9438 {
9439         /*-
9440          * Ok this is the generic chunk service queue. we must do the
9441          * following:
9442          * - See if there are retransmits pending, if so we must
9443          *   do these first.
9444          * - Service the stream queue that is next, moving any
9445          *   message (note I must get a complete message i.e.
9446          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9447          *   TSN's
9448          * - Check to see if the cwnd/rwnd allows any output, if so we
9449          *   go ahead and fomulate and send the low level chunks. Making sure
9450          *   to combine any control in the control chunk queue also.
9451          */
9452         struct sctp_association *asoc;
9453         struct sctp_nets *net;
9454         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9455             burst_cnt = 0, burst_limit = 0;
9456         struct timeval now;
9457         int now_filled = 0;
9458         int nagle_on = 0;
9459         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9460         int un_sent = 0;
9461         int fr_done, tot_frs = 0;
9462
9463         asoc = &stcb->asoc;
9464         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9465                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9466                         nagle_on = 0;
9467                 } else {
9468                         nagle_on = 1;
9469                 }
9470         }
9471         SCTP_TCB_LOCK_ASSERT(stcb);
9472
9473         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9474
9475         if ((un_sent <= 0) &&
9476             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9477             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9478             (asoc->sent_queue_retran_cnt == 0)) {
9479                 /* Nothing to do unless there is something to be sent left */
9480                 return;
9481         }
9482         /*
9483          * Do we have something to send, data or control AND a sack timer
9484          * running, if so piggy-back the sack.
9485          */
9486         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9487                 sctp_send_sack(stcb);
9488                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9489         }
9490         while (asoc->sent_queue_retran_cnt) {
9491                 /*-
9492                  * Ok, it is retransmission time only, we send out only ONE
9493                  * packet with a single call off to the retran code.
9494                  */
9495                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9496                         /*-
9497                          * Special hook for handling cookiess discarded
9498                          * by peer that carried data. Send cookie-ack only
9499                          * and then the next call with get the retran's.
9500                          */
9501                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9502                             from_where,
9503                             &now, &now_filled, frag_point, so_locked);
9504                         return;
9505                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9506                         /* if its not from a HB then do it */
9507                         fr_done = 0;
9508                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9509                         if (fr_done) {
9510                                 tot_frs++;
9511                         }
9512                 } else {
9513                         /*
9514                          * its from any other place, we don't allow retran
9515                          * output (only control)
9516                          */
9517                         ret = 1;
9518                 }
9519                 if (ret > 0) {
9520                         /* Can't send anymore */
9521                         /*-
9522                          * now lets push out control by calling med-level
9523                          * output once. this assures that we WILL send HB's
9524                          * if queued too.
9525                          */
9526                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9527                             from_where,
9528                             &now, &now_filled, frag_point, so_locked);
9529 #ifdef SCTP_AUDITING_ENABLED
9530                         sctp_auditing(8, inp, stcb, NULL);
9531 #endif
9532                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9533                         return;
9534                 }
9535                 if (ret < 0) {
9536                         /*-
9537                          * The count was off.. retran is not happening so do
9538                          * the normal retransmission.
9539                          */
9540 #ifdef SCTP_AUDITING_ENABLED
9541                         sctp_auditing(9, inp, stcb, NULL);
9542 #endif
9543                         if (ret == SCTP_RETRAN_EXIT) {
9544                                 return;
9545                         }
9546                         break;
9547                 }
9548                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9549                         /* Only one transmission allowed out of a timeout */
9550 #ifdef SCTP_AUDITING_ENABLED
9551                         sctp_auditing(10, inp, stcb, NULL);
9552 #endif
9553                         /* Push out any control */
9554                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9555                             &now, &now_filled, frag_point, so_locked);
9556                         return;
9557                 }
9558                 if (tot_frs > asoc->max_burst) {
9559                         /* Hit FR burst limit */
9560                         return;
9561                 }
9562                 if ((num_out == 0) && (ret == 0)) {
9563
9564                         /* No more retrans to send */
9565                         break;
9566                 }
9567         }
9568 #ifdef SCTP_AUDITING_ENABLED
9569         sctp_auditing(12, inp, stcb, NULL);
9570 #endif
9571         /* Check for bad destinations, if they exist move chunks around. */
9572         burst_limit = asoc->max_burst;
9573         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9574                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9575                     SCTP_ADDR_NOT_REACHABLE) {
9576                         /*-
9577                          * if possible move things off of this address we
9578                          * still may send below due to the dormant state but
9579                          * we try to find an alternate address to send to
9580                          * and if we have one we move all queued data on the
9581                          * out wheel to this alternate address.
9582                          */
9583                         if (net->ref_count > 1)
9584                                 sctp_move_chunks_from_net(stcb, net);
9585                 } else if ((asoc->sctp_cmt_on_off == 1) &&
9586                             (asoc->sctp_cmt_pf > 0) &&
9587                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9588                         /*
9589                          * JRS 5/14/07 - If CMT PF is on and the current
9590                          * destination is in PF state, move all queued data
9591                          * to an alternate desination.
9592                          */
9593                         if (net->ref_count > 1)
9594                                 sctp_move_chunks_from_net(stcb, net);
9595                 } else {
9596                         /*-
9597                          * if ((asoc->sat_network) || (net->addr_is_local))
9598                          * { burst_limit = asoc->max_burst *
9599                          * SCTP_SAT_NETWORK_BURST_INCR; }
9600                          */
9601                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9602                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9603                                         /*
9604                                          * JRS - Use the congestion control
9605                                          * given in the congestion control
9606                                          * module
9607                                          */
9608                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9609                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9610                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9611                                         }
9612                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9613                                 }
9614                                 net->fast_retran_ip = 0;
9615                         } else {
9616                                 if (net->flight_size == 0) {
9617                                         /* Should be decaying the cwnd here */
9618                                         ;
9619                                 }
9620                         }
9621                 }
9622
9623         }
9624         burst_cnt = 0;
9625         do {
9626                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9627                     &reason_code, 0, from_where,
9628                     &now, &now_filled, frag_point, so_locked);
9629                 if (error) {
9630                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9631                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9632                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9633                         }
9634                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9635                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9636                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9637                         }
9638                         break;
9639                 }
9640                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9641
9642                 tot_out += num_out;
9643                 burst_cnt++;
9644                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9645                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9646                         if (num_out == 0) {
9647                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9648                         }
9649                 }
9650                 if (nagle_on) {
9651                         /*-
9652                          * When nagle is on, we look at how much is un_sent, then
9653                          * if its smaller than an MTU and we have data in
9654                          * flight we stop.
9655                          */
9656                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9657                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9658                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9659                             (stcb->asoc.total_flight > 0)) {
9660                                 break;
9661                         }
9662                 }
9663                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9664                     TAILQ_EMPTY(&asoc->send_queue) &&
9665                     TAILQ_EMPTY(&asoc->out_wheel)) {
9666                         /* Nothing left to send */
9667                         break;
9668                 }
9669                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9670                         /* Nothing left to send */
9671                         break;
9672                 }
9673         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9674             (burst_cnt < burst_limit)));
9675
9676         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9677                 if (burst_cnt >= burst_limit) {
9678                         SCTP_STAT_INCR(sctps_maxburstqueued);
9679                         asoc->burst_limit_applied = 1;
9680                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9681                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9682                         }
9683                 } else {
9684                         asoc->burst_limit_applied = 0;
9685                 }
9686         }
9687         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9688                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9689         }
9690         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9691             tot_out);
9692
9693         /*-
9694          * Now we need to clean up the control chunk chain if a ECNE is on
9695          * it. It must be marked as UNSENT again so next call will continue
9696          * to send it until such time that we get a CWR, to remove it.
9697          */
9698         if (stcb->asoc.ecn_echo_cnt_onq)
9699                 sctp_fix_ecn_echo(asoc);
9700         return;
9701 }
9702
9703
9704 int
9705 sctp_output(inp, m, addr, control, p, flags)
9706         struct sctp_inpcb *inp;
9707         struct mbuf *m;
9708         struct sockaddr *addr;
9709         struct mbuf *control;
9710         struct thread *p;
9711         int flags;
9712 {
9713         if (inp == NULL) {
9714                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9715                 return (EINVAL);
9716         }
9717         if (inp->sctp_socket == NULL) {
9718                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9719                 return (EINVAL);
9720         }
9721         return (sctp_sosend(inp->sctp_socket,
9722             addr,
9723             (struct uio *)NULL,
9724             m,
9725             control,
9726             flags, p
9727             ));
9728 }
9729
9730 void
9731 send_forward_tsn(struct sctp_tcb *stcb,
9732     struct sctp_association *asoc)
9733 {
9734         struct sctp_tmit_chunk *chk;
9735         struct sctp_forward_tsn_chunk *fwdtsn;
9736         uint32_t advance_peer_ack_point;
9737
9738         SCTP_TCB_LOCK_ASSERT(stcb);
9739         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9740                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9741                         /* mark it to unsent */
9742                         chk->sent = SCTP_DATAGRAM_UNSENT;
9743                         chk->snd_count = 0;
9744                         /* Do we correct its output location? */
9745                         if (chk->whoTo != asoc->primary_destination) {
9746                                 sctp_free_remote_addr(chk->whoTo);
9747                                 chk->whoTo = asoc->primary_destination;
9748                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9749                         }
9750                         goto sctp_fill_in_rest;
9751                 }
9752         }
9753         /* Ok if we reach here we must build one */
9754         sctp_alloc_a_chunk(stcb, chk);
9755         if (chk == NULL) {
9756                 return;
9757         }
9758         asoc->fwd_tsn_cnt++;
9759         chk->copy_by_ref = 0;
9760         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9761         chk->rec.chunk_id.can_take_data = 0;
9762         chk->asoc = asoc;
9763         chk->whoTo = NULL;
9764         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9765         if (chk->data == NULL) {
9766                 sctp_free_a_chunk(stcb, chk);
9767                 return;
9768         }
9769         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9770         chk->sent = SCTP_DATAGRAM_UNSENT;
9771         chk->snd_count = 0;
9772         chk->whoTo = asoc->primary_destination;
9773         atomic_add_int(&chk->whoTo->ref_count, 1);
9774         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9775         asoc->ctrl_queue_cnt++;
9776 sctp_fill_in_rest:
9777         /*-
9778          * Here we go through and fill out the part that deals with
9779          * stream/seq of the ones we skip.
9780          */
9781         SCTP_BUF_LEN(chk->data) = 0;
9782         {
9783                 struct sctp_tmit_chunk *at, *tp1, *last;
9784                 struct sctp_strseq *strseq;
9785                 unsigned int cnt_of_space, i, ovh;
9786                 unsigned int space_needed;
9787                 unsigned int cnt_of_skipped = 0;
9788
9789                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9790                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9791                                 /* no more to look at */
9792                                 break;
9793                         }
9794                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9795                                 /* We don't report these */
9796                                 continue;
9797                         }
9798                         cnt_of_skipped++;
9799                 }
9800                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9801                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9802
9803                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9804
9805                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9806                         ovh = SCTP_MIN_OVERHEAD;
9807                 } else {
9808                         ovh = SCTP_MIN_V4_OVERHEAD;
9809                 }
9810                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9811                         /* trim to a mtu size */
9812                         cnt_of_space = asoc->smallest_mtu - ovh;
9813                 }
9814                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9815                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9816                             0xff, 0, cnt_of_skipped,
9817                             asoc->advanced_peer_ack_point);
9818
9819                 }
9820                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9821                 if (cnt_of_space < space_needed) {
9822                         /*-
9823                          * ok we must trim down the chunk by lowering the
9824                          * advance peer ack point.
9825                          */
9826                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9827                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9828                                     0xff, 0xff, cnt_of_space,
9829                                     space_needed);
9830                         }
9831                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9832                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9833                         /*-
9834                          * Go through and find the TSN that will be the one
9835                          * we report.
9836                          */
9837                         at = TAILQ_FIRST(&asoc->sent_queue);
9838                         for (i = 0; i < cnt_of_skipped; i++) {
9839                                 tp1 = TAILQ_NEXT(at, sctp_next);
9840                                 if (tp1 == NULL) {
9841                                         break;
9842                                 }
9843                                 at = tp1;
9844                         }
9845                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9846                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9847                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9848                                     asoc->advanced_peer_ack_point);
9849                         }
9850                         last = at;
9851                         /*-
9852                          * last now points to last one I can report, update
9853                          * peer ack point
9854                          */
9855                         if (last)
9856                                 advance_peer_ack_point = last->rec.data.TSN_seq;
9857                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
9858                             cnt_of_skipped * sizeof(struct sctp_strseq);
9859                 }
9860                 chk->send_size = space_needed;
9861                 /* Setup the chunk */
9862                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9863                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9864                 fwdtsn->ch.chunk_flags = 0;
9865                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9866                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9867                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9868                 fwdtsn++;
9869                 /*-
9870                  * Move pointer to after the fwdtsn and transfer to the
9871                  * strseq pointer.
9872                  */
9873                 strseq = (struct sctp_strseq *)fwdtsn;
9874                 /*-
9875                  * Now populate the strseq list. This is done blindly
9876                  * without pulling out duplicate stream info. This is
9877                  * inefficent but won't harm the process since the peer will
9878                  * look at these in sequence and will thus release anything.
9879                  * It could mean we exceed the PMTU and chop off some that
9880                  * we could have included.. but this is unlikely (aka 1432/4
9881                  * would mean 300+ stream seq's would have to be reported in
9882                  * one FWD-TSN. With a bit of work we can later FIX this to
9883                  * optimize and pull out duplcates.. but it does add more
9884                  * overhead. So for now... not!
9885                  */
9886                 at = TAILQ_FIRST(&asoc->sent_queue);
9887                 for (i = 0; i < cnt_of_skipped; i++) {
9888                         tp1 = TAILQ_NEXT(at, sctp_next);
9889                         if (tp1 == NULL)
9890                                 break;
9891                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9892                                 /* We don't report these */
9893                                 i--;
9894                                 at = tp1;
9895                                 continue;
9896                         }
9897                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9898                                 at->rec.data.fwd_tsn_cnt = 0;
9899                         }
9900                         strseq->stream = ntohs(at->rec.data.stream_number);
9901                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9902                         strseq++;
9903                         at = tp1;
9904                 }
9905         }
9906         return;
9907
9908 }
9909
9910 void
9911 sctp_send_sack(struct sctp_tcb *stcb)
9912 {
9913         /*-
9914          * Queue up a SACK or NR-SACK in the control queue.
9915          * We must first check to see if a SACK or NR-SACK is
9916          * somehow on the control queue.
9917          * If so, we will take and and remove the old one.
9918          */
9919         struct sctp_association *asoc;
9920         struct sctp_tmit_chunk *chk, *a_chk;
9921         struct sctp_sack_chunk *sack;
9922         struct sctp_nr_sack_chunk *nr_sack;
9923         struct sctp_gap_ack_block *gap_descriptor;
9924         struct sack_track *selector;
9925         int mergeable = 0;
9926         int offset;
9927         caddr_t limit;
9928         uint32_t *dup;
9929         int limit_reached = 0;
9930         unsigned int i, siz, j;
9931         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9932         int num_dups = 0;
9933         int space_req;
9934         uint32_t highest_tsn;
9935         uint8_t flags;
9936         uint8_t type;
9937         uint8_t tsn_map;
9938
9939         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
9940             (stcb->asoc.peer_supports_nr_sack == 1)) {
9941                 type = SCTP_NR_SELECTIVE_ACK;
9942         } else {
9943                 type = SCTP_SELECTIVE_ACK;
9944         }
9945         a_chk = NULL;
9946         asoc = &stcb->asoc;
9947         SCTP_TCB_LOCK_ASSERT(stcb);
9948         if (asoc->last_data_chunk_from == NULL) {
9949                 /* Hmm we never received anything */
9950                 return;
9951         }
9952         sctp_slide_mapping_arrays(stcb);
9953         sctp_set_rwnd(stcb, asoc);
9954         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9955                 if (chk->rec.chunk_id.id == type) {
9956                         /* Hmm, found a sack already on queue, remove it */
9957                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9958                         asoc->ctrl_queue_cnt--;
9959                         a_chk = chk;
9960                         if (a_chk->data) {
9961                                 sctp_m_freem(a_chk->data);
9962                                 a_chk->data = NULL;
9963                         }
9964                         sctp_free_remote_addr(a_chk->whoTo);
9965                         a_chk->whoTo = NULL;
9966                         break;
9967                 }
9968         }
9969         if (a_chk == NULL) {
9970                 sctp_alloc_a_chunk(stcb, a_chk);
9971                 if (a_chk == NULL) {
9972                         /* No memory so we drop the idea, and set a timer */
9973                         if (stcb->asoc.delayed_ack) {
9974                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9975                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9976                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9977                                     stcb->sctp_ep, stcb, NULL);
9978                         } else {
9979                                 stcb->asoc.send_sack = 1;
9980                         }
9981                         return;
9982                 }
9983                 a_chk->copy_by_ref = 0;
9984                 a_chk->rec.chunk_id.id = type;
9985                 a_chk->rec.chunk_id.can_take_data = 1;
9986         }
9987         /* Clear our pkt counts */
9988         asoc->data_pkts_seen = 0;
9989
9990         a_chk->asoc = asoc;
9991         a_chk->snd_count = 0;
9992         a_chk->send_size = 0;   /* fill in later */
9993         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9994         a_chk->whoTo = NULL;
9995
9996         if ((asoc->numduptsns) ||
9997             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) {
9998                 /*-
9999                  * Ok, we have some duplicates or the destination for the
10000                  * sack is unreachable, lets see if we can select an
10001                  * alternate than asoc->last_data_chunk_from
10002                  */
10003                 if ((!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) &&
10004                     (asoc->used_alt_onsack > asoc->numnets)) {
10005                         /* We used an alt last time, don't this time */
10006                         a_chk->whoTo = NULL;
10007                 } else {
10008                         asoc->used_alt_onsack++;
10009                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10010                 }
10011                 if (a_chk->whoTo == NULL) {
10012                         /* Nope, no alternate */
10013                         a_chk->whoTo = asoc->last_data_chunk_from;
10014                         asoc->used_alt_onsack = 0;
10015                 }
10016         } else {
10017                 /*
10018                  * No duplicates so we use the last place we received data
10019                  * from.
10020                  */
10021                 asoc->used_alt_onsack = 0;
10022                 a_chk->whoTo = asoc->last_data_chunk_from;
10023         }
10024         if (a_chk->whoTo) {
10025                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10026         }
10027         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map, MAX_TSN)) {
10028                 highest_tsn = asoc->highest_tsn_inside_map;
10029         } else {
10030                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10031         }
10032         if (highest_tsn == asoc->cumulative_tsn) {
10033                 /* no gaps */
10034                 if (type == SCTP_SELECTIVE_ACK) {
10035                         space_req = sizeof(struct sctp_sack_chunk);
10036                 } else {
10037                         space_req = sizeof(struct sctp_nr_sack_chunk);
10038                 }
10039         } else {
10040                 /* gaps get a cluster */
10041                 space_req = MCLBYTES;
10042         }
10043         /* Ok now lets formulate a MBUF with our sack */
10044         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10045         if ((a_chk->data == NULL) ||
10046             (a_chk->whoTo == NULL)) {
10047                 /* rats, no mbuf memory */
10048                 if (a_chk->data) {
10049                         /* was a problem with the destination */
10050                         sctp_m_freem(a_chk->data);
10051                         a_chk->data = NULL;
10052                 }
10053                 sctp_free_a_chunk(stcb, a_chk);
10054                 /* sa_ignore NO_NULL_CHK */
10055                 if (stcb->asoc.delayed_ack) {
10056                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10057                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10058                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10059                             stcb->sctp_ep, stcb, NULL);
10060                 } else {
10061                         stcb->asoc.send_sack = 1;
10062                 }
10063                 return;
10064         }
10065         /* ok, lets go through and fill it in */
10066         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10067         space = M_TRAILINGSPACE(a_chk->data);
10068         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10069                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10070         }
10071         limit = mtod(a_chk->data, caddr_t);
10072         limit += space;
10073
10074         /* 0x01 is used by nonce for ecn */
10075         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10076             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10077             (asoc->peer_supports_ecn_nonce))
10078                 flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10079         else
10080                 flags = 0;
10081
10082         if ((asoc->sctp_cmt_on_off == 1) &&
10083             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10084                 /*-
10085                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10086                  * received, then set high bit to 1, else 0. Reset
10087                  * pkts_rcvd.
10088                  */
10089                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10090                 asoc->cmt_dac_pkts_rcvd = 0;
10091         }
10092 #ifdef SCTP_ASOCLOG_OF_TSNS
10093         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10094         stcb->asoc.cumack_log_atsnt++;
10095         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10096                 stcb->asoc.cumack_log_atsnt = 0;
10097         }
10098 #endif
10099         /* reset the readers interpretation */
10100         stcb->freed_by_sorcv_sincelast = 0;
10101
10102         if (type == SCTP_SELECTIVE_ACK) {
10103                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10104                 nr_sack = NULL;
10105                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10106                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10107                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10108                 } else {
10109                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10110                 }
10111         } else {
10112                 sack = NULL;
10113                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10114                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10115                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10116                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10117                 } else {
10118                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10119                 }
10120         }
10121
10122         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10123                 offset = 1;
10124         } else {
10125                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10126         }
10127         if (((type == SCTP_SELECTIVE_ACK) &&
10128             compare_with_wrap(highest_tsn, asoc->cumulative_tsn, MAX_TSN)) ||
10129             ((type == SCTP_NR_SELECTIVE_ACK) &&
10130             compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN))) {
10131                 /* we have a gap .. maybe */
10132                 for (i = 0; i < siz; i++) {
10133                         tsn_map = asoc->mapping_array[i];
10134                         if (type == SCTP_SELECTIVE_ACK) {
10135                                 tsn_map |= asoc->nr_mapping_array[i];
10136                         }
10137                         if (i == 0) {
10138                                 /*
10139                                  * Clear all bits corresponding to TSNs
10140                                  * smaller or equal to the cumulative TSN.
10141                                  */
10142                                 tsn_map &= (~0 << (1 - offset));
10143                         }
10144                         selector = &sack_array[tsn_map];
10145                         if (mergeable && selector->right_edge) {
10146                                 /*
10147                                  * Backup, left and right edges were ok to
10148                                  * merge.
10149                                  */
10150                                 num_gap_blocks--;
10151                                 gap_descriptor--;
10152                         }
10153                         if (selector->num_entries == 0)
10154                                 mergeable = 0;
10155                         else {
10156                                 for (j = 0; j < selector->num_entries; j++) {
10157                                         if (mergeable && selector->right_edge) {
10158                                                 /*
10159                                                  * do a merge by NOT setting
10160                                                  * the left side
10161                                                  */
10162                                                 mergeable = 0;
10163                                         } else {
10164                                                 /*
10165                                                  * no merge, set the left
10166                                                  * side
10167                                                  */
10168                                                 mergeable = 0;
10169                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10170                                         }
10171                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10172                                         num_gap_blocks++;
10173                                         gap_descriptor++;
10174                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10175                                                 /* no more room */
10176                                                 limit_reached = 1;
10177                                                 break;
10178                                         }
10179                                 }
10180                                 if (selector->left_edge) {
10181                                         mergeable = 1;
10182                                 }
10183                         }
10184                         if (limit_reached) {
10185                                 /* Reached the limit stop */
10186                                 break;
10187                         }
10188                         offset += 8;
10189                 }
10190         }
10191         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10192             (limit_reached == 0)) {
10193
10194                 mergeable = 0;
10195
10196                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10197                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10198                 } else {
10199                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10200                 }
10201
10202                 if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10203                         offset = 1;
10204                 } else {
10205                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10206                 }
10207                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10208                         /* we have a gap .. maybe */
10209                         for (i = 0; i < siz; i++) {
10210                                 tsn_map = asoc->nr_mapping_array[i];
10211                                 if (i == 0) {
10212                                         /*
10213                                          * Clear all bits corresponding to
10214                                          * TSNs smaller or equal to the
10215                                          * cumulative TSN.
10216                                          */
10217                                         tsn_map &= (~0 << (1 - offset));
10218                                 }
10219                                 selector = &sack_array[tsn_map];
10220                                 if (mergeable && selector->right_edge) {
10221                                         /*
10222                                          * Backup, left and right edges were
10223                                          * ok to merge.
10224                                          */
10225                                         num_nr_gap_blocks--;
10226                                         gap_descriptor--;
10227                                 }
10228                                 if (selector->num_entries == 0)
10229                                         mergeable = 0;
10230                                 else {
10231                                         for (j = 0; j < selector->num_entries; j++) {
10232                                                 if (mergeable && selector->right_edge) {
10233                                                         /*
10234                                                          * do a merge by NOT
10235                                                          * setting the left
10236                                                          * side
10237                                                          */
10238                                                         mergeable = 0;
10239                                                 } else {
10240                                                         /*
10241                                                          * no merge, set the
10242                                                          * left side
10243                                                          */
10244                                                         mergeable = 0;
10245                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10246                                                 }
10247                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10248                                                 num_nr_gap_blocks++;
10249                                                 gap_descriptor++;
10250                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10251                                                         /* no more room */
10252                                                         limit_reached = 1;
10253                                                         break;
10254                                                 }
10255                                         }
10256                                         if (selector->left_edge) {
10257                                                 mergeable = 1;
10258                                         }
10259                                 }
10260                                 if (limit_reached) {
10261                                         /* Reached the limit stop */
10262                                         break;
10263                                 }
10264                                 offset += 8;
10265                         }
10266                 }
10267         }
10268         /* now we must add any dups we are going to report. */
10269         if ((limit_reached == 0) && (asoc->numduptsns)) {
10270                 dup = (uint32_t *) gap_descriptor;
10271                 for (i = 0; i < asoc->numduptsns; i++) {
10272                         *dup = htonl(asoc->dup_tsns[i]);
10273                         dup++;
10274                         num_dups++;
10275                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10276                                 /* no more room */
10277                                 break;
10278                         }
10279                 }
10280                 asoc->numduptsns = 0;
10281         }
10282         /*
10283          * now that the chunk is prepared queue it to the control chunk
10284          * queue.
10285          */
10286         if (type == SCTP_SELECTIVE_ACK) {
10287                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10288                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10289                     num_dups * sizeof(int32_t);
10290                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10291                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10292                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10293                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10294                 sack->sack.num_dup_tsns = htons(num_dups);
10295                 sack->ch.chunk_type = type;
10296                 sack->ch.chunk_flags = flags;
10297                 sack->ch.chunk_length = htons(a_chk->send_size);
10298         } else {
10299                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10300                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10301                     num_dups * sizeof(int32_t);
10302                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10303                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10304                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10305                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10306                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10307                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10308                 nr_sack->nr_sack.reserved = 0;
10309                 nr_sack->ch.chunk_type = type;
10310                 nr_sack->ch.chunk_flags = flags;
10311                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10312         }
10313         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10314         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10315         asoc->ctrl_queue_cnt++;
10316         asoc->send_sack = 0;
10317         SCTP_STAT_INCR(sctps_sendsacks);
10318         return;
10319 }
10320
10321 void
10322 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10323 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10324     SCTP_UNUSED
10325 #endif
10326 )
10327 {
10328         struct mbuf *m_abort;
10329         struct mbuf *m_out = NULL, *m_end = NULL;
10330         struct sctp_abort_chunk *abort = NULL;
10331         int sz;
10332         uint32_t auth_offset = 0;
10333         struct sctp_auth_chunk *auth = NULL;
10334
10335         /*-
10336          * Add an AUTH chunk, if chunk requires it and save the offset into
10337          * the chain for AUTH
10338          */
10339         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10340             stcb->asoc.peer_auth_chunks)) {
10341                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10342                     stcb, SCTP_ABORT_ASSOCIATION);
10343                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10344         }
10345         SCTP_TCB_LOCK_ASSERT(stcb);
10346         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10347         if (m_abort == NULL) {
10348                 /* no mbuf's */
10349                 if (m_out)
10350                         sctp_m_freem(m_out);
10351                 return;
10352         }
10353         /* link in any error */
10354         SCTP_BUF_NEXT(m_abort) = operr;
10355         sz = 0;
10356         if (operr) {
10357                 struct mbuf *n;
10358
10359                 n = operr;
10360                 while (n) {
10361                         sz += SCTP_BUF_LEN(n);
10362                         n = SCTP_BUF_NEXT(n);
10363                 }
10364         }
10365         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10366         if (m_out == NULL) {
10367                 /* NO Auth chunk prepended, so reserve space in front */
10368                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10369                 m_out = m_abort;
10370         } else {
10371                 /* Put AUTH chunk at the front of the chain */
10372                 SCTP_BUF_NEXT(m_end) = m_abort;
10373         }
10374
10375         /* fill in the ABORT chunk */
10376         abort = mtod(m_abort, struct sctp_abort_chunk *);
10377         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10378         abort->ch.chunk_flags = 0;
10379         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10380
10381         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10382             stcb->asoc.primary_destination,
10383             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10384             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10385             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10386             stcb->asoc.primary_destination->port, so_locked, NULL);
10387         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10388 }
10389
10390 void
10391 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10392     struct sctp_nets *net,
10393     int reflect_vtag)
10394 {
10395         /* formulate and SEND a SHUTDOWN-COMPLETE */
10396         struct mbuf *m_shutdown_comp;
10397         struct sctp_shutdown_complete_chunk *shutdown_complete;
10398         uint32_t vtag;
10399         uint8_t flags;
10400
10401         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10402         if (m_shutdown_comp == NULL) {
10403                 /* no mbuf's */
10404                 return;
10405         }
10406         if (reflect_vtag) {
10407                 flags = SCTP_HAD_NO_TCB;
10408                 vtag = stcb->asoc.my_vtag;
10409         } else {
10410                 flags = 0;
10411                 vtag = stcb->asoc.peer_vtag;
10412         }
10413         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10414         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10415         shutdown_complete->ch.chunk_flags = flags;
10416         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10417         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10418         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10419             (struct sockaddr *)&net->ro._l_addr,
10420             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10421             stcb->sctp_ep->sctp_lport, stcb->rport,
10422             htonl(vtag),
10423             net->port, SCTP_SO_NOT_LOCKED, NULL);
10424         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10425         return;
10426 }
10427
10428 void
10429 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10430     uint32_t vrf_id, uint16_t port)
10431 {
10432         /* formulate and SEND a SHUTDOWN-COMPLETE */
10433         struct mbuf *o_pak;
10434         struct mbuf *mout;
10435         struct ip *iph, *iph_out;
10436         struct udphdr *udp = NULL;
10437
10438 #ifdef INET6
10439         struct ip6_hdr *ip6, *ip6_out;
10440
10441 #endif
10442         int offset_out, len, mlen;
10443         struct sctp_shutdown_complete_msg *comp_cp;
10444
10445         iph = mtod(m, struct ip *);
10446         switch (iph->ip_v) {
10447         case IPVERSION:
10448                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10449                 break;
10450 #ifdef INET6
10451         case IPV6_VERSION >> 4:
10452                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10453                 break;
10454 #endif
10455         default:
10456                 return;
10457         }
10458         if (port) {
10459                 len += sizeof(struct udphdr);
10460         }
10461         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10462         if (mout == NULL) {
10463                 return;
10464         }
10465         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10466         SCTP_BUF_LEN(mout) = len;
10467         SCTP_BUF_NEXT(mout) = NULL;
10468         iph_out = NULL;
10469 #ifdef INET6
10470         ip6_out = NULL;
10471 #endif
10472         offset_out = 0;
10473
10474         switch (iph->ip_v) {
10475         case IPVERSION:
10476                 iph_out = mtod(mout, struct ip *);
10477
10478                 /* Fill in the IP header for the ABORT */
10479                 iph_out->ip_v = IPVERSION;
10480                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10481                 iph_out->ip_tos = (u_char)0;
10482                 iph_out->ip_id = 0;
10483                 iph_out->ip_off = 0;
10484                 iph_out->ip_ttl = MAXTTL;
10485                 if (port) {
10486                         iph_out->ip_p = IPPROTO_UDP;
10487                 } else {
10488                         iph_out->ip_p = IPPROTO_SCTP;
10489                 }
10490                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10491                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10492
10493                 /* let IP layer calculate this */
10494                 iph_out->ip_sum = 0;
10495                 offset_out += sizeof(*iph_out);
10496                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10497                     (caddr_t)iph_out + offset_out);
10498                 break;
10499 #ifdef INET6
10500         case IPV6_VERSION >> 4:
10501                 ip6 = (struct ip6_hdr *)iph;
10502                 ip6_out = mtod(mout, struct ip6_hdr *);
10503
10504                 /* Fill in the IPv6 header for the ABORT */
10505                 ip6_out->ip6_flow = ip6->ip6_flow;
10506                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10507                 if (port) {
10508                         ip6_out->ip6_nxt = IPPROTO_UDP;
10509                 } else {
10510                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10511                 }
10512                 ip6_out->ip6_src = ip6->ip6_dst;
10513                 ip6_out->ip6_dst = ip6->ip6_src;
10514                 /*
10515                  * ?? The old code had both the iph len + payload, I think
10516                  * this is wrong and would never have worked
10517                  */
10518                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10519                 offset_out += sizeof(*ip6_out);
10520                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10521                     (caddr_t)ip6_out + offset_out);
10522                 break;
10523 #endif                          /* INET6 */
10524         default:
10525                 /* Currently not supported. */
10526                 sctp_m_freem(mout);
10527                 return;
10528         }
10529         if (port) {
10530                 udp = (struct udphdr *)comp_cp;
10531                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10532                 udp->uh_dport = port;
10533                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10534                 if (iph_out)
10535                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10536                 offset_out += sizeof(struct udphdr);
10537                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10538         }
10539         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10540                 /* no mbuf's */
10541                 sctp_m_freem(mout);
10542                 return;
10543         }
10544         /* Now copy in and fill in the ABORT tags etc. */
10545         comp_cp->sh.src_port = sh->dest_port;
10546         comp_cp->sh.dest_port = sh->src_port;
10547         comp_cp->sh.checksum = 0;
10548         comp_cp->sh.v_tag = sh->v_tag;
10549         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10550         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10551         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10552
10553         if (iph_out != NULL) {
10554                 sctp_route_t ro;
10555                 int ret;
10556
10557                 mlen = SCTP_BUF_LEN(mout);
10558                 bzero(&ro, sizeof ro);
10559                 /* set IPv4 length */
10560                 iph_out->ip_len = mlen;
10561 #ifdef  SCTP_PACKET_LOGGING
10562                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10563                         sctp_packet_log(mout, mlen);
10564 #endif
10565                 if (port) {
10566 #if defined(SCTP_WITH_NO_CSUM)
10567                         SCTP_STAT_INCR(sctps_sendnocrc);
10568 #else
10569                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10570                         SCTP_STAT_INCR(sctps_sendswcrc);
10571 #endif
10572                         SCTP_ENABLE_UDP_CSUM(mout);
10573                 } else {
10574 #if defined(SCTP_WITH_NO_CSUM)
10575                         SCTP_STAT_INCR(sctps_sendnocrc);
10576 #else
10577                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10578                         mout->m_pkthdr.csum_data = 0;
10579                         SCTP_STAT_INCR(sctps_sendhwcrc);
10580 #endif
10581                 }
10582                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10583                 /* out it goes */
10584                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10585
10586                 /* Free the route if we got one back */
10587                 if (ro.ro_rt)
10588                         RTFREE(ro.ro_rt);
10589         }
10590 #ifdef INET6
10591         if (ip6_out != NULL) {
10592                 struct route_in6 ro;
10593                 int ret;
10594                 struct ifnet *ifp = NULL;
10595
10596                 bzero(&ro, sizeof(ro));
10597                 mlen = SCTP_BUF_LEN(mout);
10598 #ifdef  SCTP_PACKET_LOGGING
10599                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10600                         sctp_packet_log(mout, mlen);
10601 #endif
10602                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10603                 if (port) {
10604 #if defined(SCTP_WITH_NO_CSUM)
10605                         SCTP_STAT_INCR(sctps_sendnocrc);
10606 #else
10607                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10608                         SCTP_STAT_INCR(sctps_sendswcrc);
10609 #endif
10610                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10611                                 udp->uh_sum = 0xffff;
10612                         }
10613                 } else {
10614 #if defined(SCTP_WITH_NO_CSUM)
10615                         SCTP_STAT_INCR(sctps_sendnocrc);
10616 #else
10617                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10618                         mout->m_pkthdr.csum_data = 0;
10619                         SCTP_STAT_INCR(sctps_sendhwcrc);
10620 #endif
10621                 }
10622                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
10623
10624                 /* Free the route if we got one back */
10625                 if (ro.ro_rt)
10626                         RTFREE(ro.ro_rt);
10627         }
10628 #endif
10629         SCTP_STAT_INCR(sctps_sendpackets);
10630         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10631         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10632         return;
10633
10634 }
10635
10636 static struct sctp_nets *
10637 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10638 {
10639         struct sctp_nets *net, *hnet;
10640         int ms_goneby, highest_ms, state_overide = 0;
10641
10642         (void)SCTP_GETTIME_TIMEVAL(now);
10643         highest_ms = 0;
10644         hnet = NULL;
10645         SCTP_TCB_LOCK_ASSERT(stcb);
10646         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10647                 if (
10648                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10649                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10650                     ) {
10651                         /*
10652                          * Skip this guy from consideration if HB is off AND
10653                          * its confirmed
10654                          */
10655                         continue;
10656                 }
10657                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10658                         /* skip this dest net from consideration */
10659                         continue;
10660                 }
10661                 if (net->last_sent_time.tv_sec) {
10662                         /* Sent to so we subtract */
10663                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10664                 } else
10665                         /* Never been sent to */
10666                         ms_goneby = 0x7fffffff;
10667                 /*-
10668                  * When the address state is unconfirmed but still
10669                  * considered reachable, we HB at a higher rate. Once it
10670                  * goes confirmed OR reaches the "unreachable" state, thenw
10671                  * we cut it back to HB at a more normal pace.
10672                  */
10673                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10674                         state_overide = 1;
10675                 } else {
10676                         state_overide = 0;
10677                 }
10678
10679                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10680                     (ms_goneby > highest_ms)) {
10681                         highest_ms = ms_goneby;
10682                         hnet = net;
10683                 }
10684         }
10685         if (hnet &&
10686             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10687                 state_overide = 1;
10688         } else {
10689                 state_overide = 0;
10690         }
10691
10692         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10693                 /*-
10694                  * Found the one with longest delay bounds OR it is
10695                  * unconfirmed and still not marked unreachable.
10696                  */
10697                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10698 #ifdef SCTP_DEBUG
10699                 if (hnet) {
10700                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10701                             (struct sockaddr *)&hnet->ro._l_addr);
10702                 } else {
10703                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10704                 }
10705 #endif
10706                 /* update the timer now */
10707                 hnet->last_sent_time = *now;
10708                 return (hnet);
10709         }
10710         /* Nothing to HB */
10711         return (NULL);
10712 }
10713
10714 int
10715 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10716 {
10717         struct sctp_tmit_chunk *chk;
10718         struct sctp_nets *net;
10719         struct sctp_heartbeat_chunk *hb;
10720         struct timeval now;
10721         struct sockaddr_in *sin;
10722         struct sockaddr_in6 *sin6;
10723
10724         SCTP_TCB_LOCK_ASSERT(stcb);
10725         if (user_req == 0) {
10726                 net = sctp_select_hb_destination(stcb, &now);
10727                 if (net == NULL) {
10728                         /*-
10729                          * All our busy none to send to, just start the
10730                          * timer again.
10731                          */
10732                         if (stcb->asoc.state == 0) {
10733                                 return (0);
10734                         }
10735                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10736                             stcb->sctp_ep,
10737                             stcb,
10738                             net);
10739                         return (0);
10740                 }
10741         } else {
10742                 net = u_net;
10743                 if (net == NULL) {
10744                         return (0);
10745                 }
10746                 (void)SCTP_GETTIME_TIMEVAL(&now);
10747         }
10748         sin = (struct sockaddr_in *)&net->ro._l_addr;
10749         if (sin->sin_family != AF_INET) {
10750                 if (sin->sin_family != AF_INET6) {
10751                         /* huh */
10752                         return (0);
10753                 }
10754         }
10755         sctp_alloc_a_chunk(stcb, chk);
10756         if (chk == NULL) {
10757                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10758                 return (0);
10759         }
10760         chk->copy_by_ref = 0;
10761         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10762         chk->rec.chunk_id.can_take_data = 1;
10763         chk->asoc = &stcb->asoc;
10764         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10765
10766         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10767         if (chk->data == NULL) {
10768                 sctp_free_a_chunk(stcb, chk);
10769                 return (0);
10770         }
10771         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10772         SCTP_BUF_LEN(chk->data) = chk->send_size;
10773         chk->sent = SCTP_DATAGRAM_UNSENT;
10774         chk->snd_count = 0;
10775         chk->whoTo = net;
10776         atomic_add_int(&chk->whoTo->ref_count, 1);
10777         /* Now we have a mbuf that we can fill in with the details */
10778         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10779         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10780         /* fill out chunk header */
10781         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10782         hb->ch.chunk_flags = 0;
10783         hb->ch.chunk_length = htons(chk->send_size);
10784         /* Fill out hb parameter */
10785         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10786         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10787         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10788         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10789         /* Did our user request this one, put it in */
10790         hb->heartbeat.hb_info.user_req = user_req;
10791         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10792         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10793         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10794                 /*
10795                  * we only take from the entropy pool if the address is not
10796                  * confirmed.
10797                  */
10798                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10799                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10800         } else {
10801                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10802                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10803         }
10804         if (sin->sin_family == AF_INET) {
10805                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10806         } else if (sin->sin_family == AF_INET6) {
10807                 /* We leave the scope the way it is in our lookup table. */
10808                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10809                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10810         } else {
10811                 /* huh compiler bug */
10812                 return (0);
10813         }
10814
10815         /*
10816          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10817          * PF-heartbeats.  Because of this, threshold management is done by
10818          * the t3 timer handler, and does not need to be done upon the send
10819          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10820          * heartbeat is being sent is in PF state, do NOT do threshold
10821          * management.
10822          */
10823         if ((stcb->asoc.sctp_cmt_pf == 0) ||
10824             ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10825                 /* ok we have a destination that needs a beat */
10826                 /* lets do the theshold management Qiaobing style */
10827                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10828                     stcb->asoc.max_send_times)) {
10829                         /*-
10830                          * we have lost the association, in a way this is
10831                          * quite bad since we really are one less time since
10832                          * we really did not send yet. This is the down side
10833                          * to the Q's style as defined in the RFC and not my
10834                          * alternate style defined in the RFC.
10835                          */
10836                         if (chk->data != NULL) {
10837                                 sctp_m_freem(chk->data);
10838                                 chk->data = NULL;
10839                         }
10840                         /*
10841                          * Here we do NOT use the macro since the
10842                          * association is now gone.
10843                          */
10844                         if (chk->whoTo) {
10845                                 sctp_free_remote_addr(chk->whoTo);
10846                                 chk->whoTo = NULL;
10847                         }
10848                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10849                         return (-1);
10850                 }
10851         }
10852         net->hb_responded = 0;
10853         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10854         stcb->asoc.ctrl_queue_cnt++;
10855         SCTP_STAT_INCR(sctps_sendheartbeat);
10856         /*-
10857          * Call directly med level routine to put out the chunk. It will
10858          * always tumble out control chunks aka HB but it may even tumble
10859          * out data too.
10860          */
10861         return (1);
10862 }
10863
10864 void
10865 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10866     uint32_t high_tsn)
10867 {
10868         struct sctp_association *asoc;
10869         struct sctp_ecne_chunk *ecne;
10870         struct sctp_tmit_chunk *chk;
10871
10872         asoc = &stcb->asoc;
10873         SCTP_TCB_LOCK_ASSERT(stcb);
10874         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10875                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10876                         /* found a previous ECN_ECHO update it if needed */
10877                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10878                         ecne->tsn = htonl(high_tsn);
10879                         return;
10880                 }
10881         }
10882         /* nope could not find one to update so we must build one */
10883         sctp_alloc_a_chunk(stcb, chk);
10884         if (chk == NULL) {
10885                 return;
10886         }
10887         chk->copy_by_ref = 0;
10888         SCTP_STAT_INCR(sctps_sendecne);
10889         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10890         chk->rec.chunk_id.can_take_data = 0;
10891         chk->asoc = &stcb->asoc;
10892         chk->send_size = sizeof(struct sctp_ecne_chunk);
10893         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10894         if (chk->data == NULL) {
10895                 sctp_free_a_chunk(stcb, chk);
10896                 return;
10897         }
10898         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10899         SCTP_BUF_LEN(chk->data) = chk->send_size;
10900         chk->sent = SCTP_DATAGRAM_UNSENT;
10901         chk->snd_count = 0;
10902         chk->whoTo = net;
10903         atomic_add_int(&chk->whoTo->ref_count, 1);
10904         stcb->asoc.ecn_echo_cnt_onq++;
10905         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10906         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10907         ecne->ch.chunk_flags = 0;
10908         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10909         ecne->tsn = htonl(high_tsn);
10910         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10911         asoc->ctrl_queue_cnt++;
10912 }
10913
10914 void
10915 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10916     struct mbuf *m, int iphlen, int bad_crc)
10917 {
10918         struct sctp_association *asoc;
10919         struct sctp_pktdrop_chunk *drp;
10920         struct sctp_tmit_chunk *chk;
10921         uint8_t *datap;
10922         int len;
10923         int was_trunc = 0;
10924         struct ip *iph;
10925
10926 #ifdef INET6
10927         struct ip6_hdr *ip6h;
10928
10929 #endif
10930         int fullsz = 0, extra = 0;
10931         long spc;
10932         int offset;
10933         struct sctp_chunkhdr *ch, chunk_buf;
10934         unsigned int chk_length;
10935
10936         if (!stcb) {
10937                 return;
10938         }
10939         asoc = &stcb->asoc;
10940         SCTP_TCB_LOCK_ASSERT(stcb);
10941         if (asoc->peer_supports_pktdrop == 0) {
10942                 /*-
10943                  * peer must declare support before I send one.
10944                  */
10945                 return;
10946         }
10947         if (stcb->sctp_socket == NULL) {
10948                 return;
10949         }
10950         sctp_alloc_a_chunk(stcb, chk);
10951         if (chk == NULL) {
10952                 return;
10953         }
10954         chk->copy_by_ref = 0;
10955         iph = mtod(m, struct ip *);
10956         if (iph == NULL) {
10957                 sctp_free_a_chunk(stcb, chk);
10958                 return;
10959         }
10960         switch (iph->ip_v) {
10961         case IPVERSION:
10962                 /* IPv4 */
10963                 len = chk->send_size = iph->ip_len;
10964                 break;
10965 #ifdef INET6
10966         case IPV6_VERSION >> 4:
10967                 /* IPv6 */
10968                 ip6h = mtod(m, struct ip6_hdr *);
10969                 len = chk->send_size = htons(ip6h->ip6_plen);
10970                 break;
10971 #endif
10972         default:
10973                 return;
10974         }
10975         /* Validate that we do not have an ABORT in here. */
10976         offset = iphlen + sizeof(struct sctphdr);
10977         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10978             sizeof(*ch), (uint8_t *) & chunk_buf);
10979         while (ch != NULL) {
10980                 chk_length = ntohs(ch->chunk_length);
10981                 if (chk_length < sizeof(*ch)) {
10982                         /* break to abort land */
10983                         break;
10984                 }
10985                 switch (ch->chunk_type) {
10986                 case SCTP_PACKET_DROPPED:
10987                 case SCTP_ABORT_ASSOCIATION:
10988                 case SCTP_INITIATION_ACK:
10989                         /**
10990                          * We don't respond with an PKT-DROP to an ABORT
10991                          * or PKT-DROP. We also do not respond to an
10992                          * INIT-ACK, because we can't know if the initiation
10993                          * tag is correct or not.
10994                          */
10995                         sctp_free_a_chunk(stcb, chk);
10996                         return;
10997                 default:
10998                         break;
10999                 }
11000                 offset += SCTP_SIZE32(chk_length);
11001                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11002                     sizeof(*ch), (uint8_t *) & chunk_buf);
11003         }
11004
11005         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11006             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11007                 /*
11008                  * only send 1 mtu worth, trim off the excess on the end.
11009                  */
11010                 fullsz = len - extra;
11011                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11012                 was_trunc = 1;
11013         }
11014         chk->asoc = &stcb->asoc;
11015         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11016         if (chk->data == NULL) {
11017 jump_out:
11018                 sctp_free_a_chunk(stcb, chk);
11019                 return;
11020         }
11021         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11022         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11023         if (drp == NULL) {
11024                 sctp_m_freem(chk->data);
11025                 chk->data = NULL;
11026                 goto jump_out;
11027         }
11028         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11029             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11030         chk->book_size_scale = 0;
11031         if (was_trunc) {
11032                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11033                 drp->trunc_len = htons(fullsz);
11034                 /*
11035                  * Len is already adjusted to size minus overhead above take
11036                  * out the pkt_drop chunk itself from it.
11037                  */
11038                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11039                 len = chk->send_size;
11040         } else {
11041                 /* no truncation needed */
11042                 drp->ch.chunk_flags = 0;
11043                 drp->trunc_len = htons(0);
11044         }
11045         if (bad_crc) {
11046                 drp->ch.chunk_flags |= SCTP_BADCRC;
11047         }
11048         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11049         SCTP_BUF_LEN(chk->data) = chk->send_size;
11050         chk->sent = SCTP_DATAGRAM_UNSENT;
11051         chk->snd_count = 0;
11052         if (net) {
11053                 /* we should hit here */
11054                 chk->whoTo = net;
11055         } else {
11056                 chk->whoTo = asoc->primary_destination;
11057         }
11058         atomic_add_int(&chk->whoTo->ref_count, 1);
11059         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11060         chk->rec.chunk_id.can_take_data = 1;
11061         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11062         drp->ch.chunk_length = htons(chk->send_size);
11063         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11064         if (spc < 0) {
11065                 spc = 0;
11066         }
11067         drp->bottle_bw = htonl(spc);
11068         if (asoc->my_rwnd) {
11069                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11070                     asoc->size_on_all_streams +
11071                     asoc->my_rwnd_control_len +
11072                     stcb->sctp_socket->so_rcv.sb_cc);
11073         } else {
11074                 /*-
11075                  * If my rwnd is 0, possibly from mbuf depletion as well as
11076                  * space used, tell the peer there is NO space aka onq == bw
11077                  */
11078                 drp->current_onq = htonl(spc);
11079         }
11080         drp->reserved = 0;
11081         datap = drp->data;
11082         m_copydata(m, iphlen, len, (caddr_t)datap);
11083         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11084         asoc->ctrl_queue_cnt++;
11085 }
11086
11087 void
11088 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11089 {
11090         struct sctp_association *asoc;
11091         struct sctp_cwr_chunk *cwr;
11092         struct sctp_tmit_chunk *chk;
11093
11094         asoc = &stcb->asoc;
11095         SCTP_TCB_LOCK_ASSERT(stcb);
11096         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11097                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11098                         /* found a previous ECN_CWR update it if needed */
11099                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11100                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11101                             MAX_TSN)) {
11102                                 cwr->tsn = htonl(high_tsn);
11103                         }
11104                         return;
11105                 }
11106         }
11107         /* nope could not find one to update so we must build one */
11108         sctp_alloc_a_chunk(stcb, chk);
11109         if (chk == NULL) {
11110                 return;
11111         }
11112         chk->copy_by_ref = 0;
11113         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11114         chk->rec.chunk_id.can_take_data = 1;
11115         chk->asoc = &stcb->asoc;
11116         chk->send_size = sizeof(struct sctp_cwr_chunk);
11117         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11118         if (chk->data == NULL) {
11119                 sctp_free_a_chunk(stcb, chk);
11120                 return;
11121         }
11122         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11123         SCTP_BUF_LEN(chk->data) = chk->send_size;
11124         chk->sent = SCTP_DATAGRAM_UNSENT;
11125         chk->snd_count = 0;
11126         chk->whoTo = net;
11127         atomic_add_int(&chk->whoTo->ref_count, 1);
11128         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11129         cwr->ch.chunk_type = SCTP_ECN_CWR;
11130         cwr->ch.chunk_flags = 0;
11131         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11132         cwr->tsn = htonl(high_tsn);
11133         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11134         asoc->ctrl_queue_cnt++;
11135 }
11136
11137 void
11138 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11139     int number_entries, uint16_t * list,
11140     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11141 {
11142         int len, old_len, i;
11143         struct sctp_stream_reset_out_request *req_out;
11144         struct sctp_chunkhdr *ch;
11145
11146         ch = mtod(chk->data, struct sctp_chunkhdr *);
11147
11148
11149         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11150
11151         /* get to new offset for the param. */
11152         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11153         /* now how long will this param be? */
11154         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11155         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11156         req_out->ph.param_length = htons(len);
11157         req_out->request_seq = htonl(seq);
11158         req_out->response_seq = htonl(resp_seq);
11159         req_out->send_reset_at_tsn = htonl(last_sent);
11160         if (number_entries) {
11161                 for (i = 0; i < number_entries; i++) {
11162                         req_out->list_of_streams[i] = htons(list[i]);
11163                 }
11164         }
11165         if (SCTP_SIZE32(len) > len) {
11166                 /*-
11167                  * Need to worry about the pad we may end up adding to the
11168                  * end. This is easy since the struct is either aligned to 4
11169                  * bytes or 2 bytes off.
11170                  */
11171                 req_out->list_of_streams[number_entries] = 0;
11172         }
11173         /* now fix the chunk length */
11174         ch->chunk_length = htons(len + old_len);
11175         chk->book_size = len + old_len;
11176         chk->book_size_scale = 0;
11177         chk->send_size = SCTP_SIZE32(chk->book_size);
11178         SCTP_BUF_LEN(chk->data) = chk->send_size;
11179         return;
11180 }
11181
11182
11183 void
11184 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11185     int number_entries, uint16_t * list,
11186     uint32_t seq)
11187 {
11188         int len, old_len, i;
11189         struct sctp_stream_reset_in_request *req_in;
11190         struct sctp_chunkhdr *ch;
11191
11192         ch = mtod(chk->data, struct sctp_chunkhdr *);
11193
11194
11195         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11196
11197         /* get to new offset for the param. */
11198         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11199         /* now how long will this param be? */
11200         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11201         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11202         req_in->ph.param_length = htons(len);
11203         req_in->request_seq = htonl(seq);
11204         if (number_entries) {
11205                 for (i = 0; i < number_entries; i++) {
11206                         req_in->list_of_streams[i] = htons(list[i]);
11207                 }
11208         }
11209         if (SCTP_SIZE32(len) > len) {
11210                 /*-
11211                  * Need to worry about the pad we may end up adding to the
11212                  * end. This is easy since the struct is either aligned to 4
11213                  * bytes or 2 bytes off.
11214                  */
11215                 req_in->list_of_streams[number_entries] = 0;
11216         }
11217         /* now fix the chunk length */
11218         ch->chunk_length = htons(len + old_len);
11219         chk->book_size = len + old_len;
11220         chk->book_size_scale = 0;
11221         chk->send_size = SCTP_SIZE32(chk->book_size);
11222         SCTP_BUF_LEN(chk->data) = chk->send_size;
11223         return;
11224 }
11225
11226
11227 void
11228 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11229     uint32_t seq)
11230 {
11231         int len, old_len;
11232         struct sctp_stream_reset_tsn_request *req_tsn;
11233         struct sctp_chunkhdr *ch;
11234
11235         ch = mtod(chk->data, struct sctp_chunkhdr *);
11236
11237
11238         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11239
11240         /* get to new offset for the param. */
11241         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11242         /* now how long will this param be? */
11243         len = sizeof(struct sctp_stream_reset_tsn_request);
11244         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11245         req_tsn->ph.param_length = htons(len);
11246         req_tsn->request_seq = htonl(seq);
11247
11248         /* now fix the chunk length */
11249         ch->chunk_length = htons(len + old_len);
11250         chk->send_size = len + old_len;
11251         chk->book_size = SCTP_SIZE32(chk->send_size);
11252         chk->book_size_scale = 0;
11253         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11254         return;
11255 }
11256
11257 void
11258 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11259     uint32_t resp_seq, uint32_t result)
11260 {
11261         int len, old_len;
11262         struct sctp_stream_reset_response *resp;
11263         struct sctp_chunkhdr *ch;
11264
11265         ch = mtod(chk->data, struct sctp_chunkhdr *);
11266
11267
11268         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11269
11270         /* get to new offset for the param. */
11271         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11272         /* now how long will this param be? */
11273         len = sizeof(struct sctp_stream_reset_response);
11274         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11275         resp->ph.param_length = htons(len);
11276         resp->response_seq = htonl(resp_seq);
11277         resp->result = ntohl(result);
11278
11279         /* now fix the chunk length */
11280         ch->chunk_length = htons(len + old_len);
11281         chk->book_size = len + old_len;
11282         chk->book_size_scale = 0;
11283         chk->send_size = SCTP_SIZE32(chk->book_size);
11284         SCTP_BUF_LEN(chk->data) = chk->send_size;
11285         return;
11286
11287 }
11288
11289
11290 void
11291 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11292     uint32_t resp_seq, uint32_t result,
11293     uint32_t send_una, uint32_t recv_next)
11294 {
11295         int len, old_len;
11296         struct sctp_stream_reset_response_tsn *resp;
11297         struct sctp_chunkhdr *ch;
11298
11299         ch = mtod(chk->data, struct sctp_chunkhdr *);
11300
11301
11302         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11303
11304         /* get to new offset for the param. */
11305         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11306         /* now how long will this param be? */
11307         len = sizeof(struct sctp_stream_reset_response_tsn);
11308         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11309         resp->ph.param_length = htons(len);
11310         resp->response_seq = htonl(resp_seq);
11311         resp->result = htonl(result);
11312         resp->senders_next_tsn = htonl(send_una);
11313         resp->receivers_next_tsn = htonl(recv_next);
11314
11315         /* now fix the chunk length */
11316         ch->chunk_length = htons(len + old_len);
11317         chk->book_size = len + old_len;
11318         chk->send_size = SCTP_SIZE32(chk->book_size);
11319         chk->book_size_scale = 0;
11320         SCTP_BUF_LEN(chk->data) = chk->send_size;
11321         return;
11322 }
11323
11324 static void
11325 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11326     uint32_t seq,
11327     uint16_t adding)
11328 {
11329         int len, old_len;
11330         struct sctp_chunkhdr *ch;
11331         struct sctp_stream_reset_add_strm *addstr;
11332
11333         ch = mtod(chk->data, struct sctp_chunkhdr *);
11334         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11335
11336         /* get to new offset for the param. */
11337         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11338         /* now how long will this param be? */
11339         len = sizeof(struct sctp_stream_reset_add_strm);
11340
11341         /* Fill it out. */
11342         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11343         addstr->ph.param_length = htons(len);
11344         addstr->request_seq = htonl(seq);
11345         addstr->number_of_streams = htons(adding);
11346         addstr->reserved = 0;
11347
11348         /* now fix the chunk length */
11349         ch->chunk_length = htons(len + old_len);
11350         chk->send_size = len + old_len;
11351         chk->book_size = SCTP_SIZE32(chk->send_size);
11352         chk->book_size_scale = 0;
11353         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11354         return;
11355 }
11356
11357 int
11358 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11359     int number_entries, uint16_t * list,
11360     uint8_t send_out_req,
11361     uint32_t resp_seq,
11362     uint8_t send_in_req,
11363     uint8_t send_tsn_req,
11364     uint8_t add_stream,
11365     uint16_t adding
11366 )
11367 {
11368
11369         struct sctp_association *asoc;
11370         struct sctp_tmit_chunk *chk;
11371         struct sctp_chunkhdr *ch;
11372         uint32_t seq;
11373
11374         asoc = &stcb->asoc;
11375         if (asoc->stream_reset_outstanding) {
11376                 /*-
11377                  * Already one pending, must get ACK back to clear the flag.
11378                  */
11379                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11380                 return (EBUSY);
11381         }
11382         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11383             (add_stream == 0)) {
11384                 /* nothing to do */
11385                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11386                 return (EINVAL);
11387         }
11388         if (send_tsn_req && (send_out_req || send_in_req)) {
11389                 /* error, can't do that */
11390                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11391                 return (EINVAL);
11392         }
11393         sctp_alloc_a_chunk(stcb, chk);
11394         if (chk == NULL) {
11395                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11396                 return (ENOMEM);
11397         }
11398         chk->copy_by_ref = 0;
11399         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11400         chk->rec.chunk_id.can_take_data = 0;
11401         chk->asoc = &stcb->asoc;
11402         chk->book_size = sizeof(struct sctp_chunkhdr);
11403         chk->send_size = SCTP_SIZE32(chk->book_size);
11404         chk->book_size_scale = 0;
11405
11406         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11407         if (chk->data == NULL) {
11408                 sctp_free_a_chunk(stcb, chk);
11409                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11410                 return (ENOMEM);
11411         }
11412         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11413
11414         /* setup chunk parameters */
11415         chk->sent = SCTP_DATAGRAM_UNSENT;
11416         chk->snd_count = 0;
11417         chk->whoTo = asoc->primary_destination;
11418         atomic_add_int(&chk->whoTo->ref_count, 1);
11419
11420         ch = mtod(chk->data, struct sctp_chunkhdr *);
11421         ch->chunk_type = SCTP_STREAM_RESET;
11422         ch->chunk_flags = 0;
11423         ch->chunk_length = htons(chk->book_size);
11424         SCTP_BUF_LEN(chk->data) = chk->send_size;
11425
11426         seq = stcb->asoc.str_reset_seq_out;
11427         if (send_out_req) {
11428                 sctp_add_stream_reset_out(chk, number_entries, list,
11429                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11430                 asoc->stream_reset_out_is_outstanding = 1;
11431                 seq++;
11432                 asoc->stream_reset_outstanding++;
11433         }
11434         if (add_stream) {
11435                 sctp_add_a_stream(chk, seq, adding);
11436                 seq++;
11437                 asoc->stream_reset_outstanding++;
11438         }
11439         if (send_in_req) {
11440                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11441                 asoc->stream_reset_outstanding++;
11442         }
11443         if (send_tsn_req) {
11444                 sctp_add_stream_reset_tsn(chk, seq);
11445                 asoc->stream_reset_outstanding++;
11446         }
11447         asoc->str_reset = chk;
11448
11449         /* insert the chunk for sending */
11450         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11451             chk,
11452             sctp_next);
11453         asoc->ctrl_queue_cnt++;
11454         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11455         return (0);
11456 }
11457
11458 void
11459 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11460     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11461 {
11462         /*-
11463          * Formulate the abort message, and send it back down.
11464          */
11465         struct mbuf *o_pak;
11466         struct mbuf *mout;
11467         struct sctp_abort_msg *abm;
11468         struct ip *iph, *iph_out;
11469         struct udphdr *udp;
11470
11471 #ifdef INET6
11472         struct ip6_hdr *ip6, *ip6_out;
11473
11474 #endif
11475         int iphlen_out, len;
11476
11477         /* don't respond to ABORT with ABORT */
11478         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11479                 if (err_cause)
11480                         sctp_m_freem(err_cause);
11481                 return;
11482         }
11483         iph = mtod(m, struct ip *);
11484         switch (iph->ip_v) {
11485         case IPVERSION:
11486                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11487                 break;
11488 #ifdef INET6
11489         case IPV6_VERSION >> 4:
11490                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11491                 break;
11492 #endif
11493         default:
11494                 if (err_cause) {
11495                         sctp_m_freem(err_cause);
11496                 }
11497                 return;
11498         }
11499         if (port) {
11500                 len += sizeof(struct udphdr);
11501         }
11502         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11503         if (mout == NULL) {
11504                 if (err_cause) {
11505                         sctp_m_freem(err_cause);
11506                 }
11507                 return;
11508         }
11509         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11510         SCTP_BUF_LEN(mout) = len;
11511         SCTP_BUF_NEXT(mout) = err_cause;
11512         iph_out = NULL;
11513 #ifdef INET6
11514         ip6_out = NULL;
11515 #endif
11516         switch (iph->ip_v) {
11517         case IPVERSION:
11518                 iph_out = mtod(mout, struct ip *);
11519
11520                 /* Fill in the IP header for the ABORT */
11521                 iph_out->ip_v = IPVERSION;
11522                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11523                 iph_out->ip_tos = (u_char)0;
11524                 iph_out->ip_id = 0;
11525                 iph_out->ip_off = 0;
11526                 iph_out->ip_ttl = MAXTTL;
11527                 if (port) {
11528                         iph_out->ip_p = IPPROTO_UDP;
11529                 } else {
11530                         iph_out->ip_p = IPPROTO_SCTP;
11531                 }
11532                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11533                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11534                 /* let IP layer calculate this */
11535                 iph_out->ip_sum = 0;
11536
11537                 iphlen_out = sizeof(*iph_out);
11538                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11539                 break;
11540 #ifdef INET6
11541         case IPV6_VERSION >> 4:
11542                 ip6 = (struct ip6_hdr *)iph;
11543                 ip6_out = mtod(mout, struct ip6_hdr *);
11544
11545                 /* Fill in the IP6 header for the ABORT */
11546                 ip6_out->ip6_flow = ip6->ip6_flow;
11547                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11548                 if (port) {
11549                         ip6_out->ip6_nxt = IPPROTO_UDP;
11550                 } else {
11551                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11552                 }
11553                 ip6_out->ip6_src = ip6->ip6_dst;
11554                 ip6_out->ip6_dst = ip6->ip6_src;
11555
11556                 iphlen_out = sizeof(*ip6_out);
11557                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11558                 break;
11559 #endif                          /* INET6 */
11560         default:
11561                 /* Currently not supported */
11562                 sctp_m_freem(mout);
11563                 return;
11564         }
11565
11566         udp = (struct udphdr *)abm;
11567         if (port) {
11568                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11569                 udp->uh_dport = port;
11570                 /* set udp->uh_ulen later */
11571                 udp->uh_sum = 0;
11572                 iphlen_out += sizeof(struct udphdr);
11573                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11574         }
11575         abm->sh.src_port = sh->dest_port;
11576         abm->sh.dest_port = sh->src_port;
11577         abm->sh.checksum = 0;
11578         if (vtag == 0) {
11579                 abm->sh.v_tag = sh->v_tag;
11580                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11581         } else {
11582                 abm->sh.v_tag = htonl(vtag);
11583                 abm->msg.ch.chunk_flags = 0;
11584         }
11585         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11586
11587         if (err_cause) {
11588                 struct mbuf *m_tmp = err_cause;
11589                 int err_len = 0;
11590
11591                 /* get length of the err_cause chain */
11592                 while (m_tmp != NULL) {
11593                         err_len += SCTP_BUF_LEN(m_tmp);
11594                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11595                 }
11596                 len = SCTP_BUF_LEN(mout) + err_len;
11597                 if (err_len % 4) {
11598                         /* need pad at end of chunk */
11599                         uint32_t cpthis = 0;
11600                         int padlen;
11601
11602                         padlen = 4 - (len % 4);
11603                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11604                         len += padlen;
11605                 }
11606                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11607         } else {
11608                 len = SCTP_BUF_LEN(mout);
11609                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11610         }
11611
11612         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11613                 /* no mbuf's */
11614                 sctp_m_freem(mout);
11615                 return;
11616         }
11617         if (iph_out != NULL) {
11618                 sctp_route_t ro;
11619                 int ret;
11620
11621                 /* zap the stack pointer to the route */
11622                 bzero(&ro, sizeof ro);
11623                 if (port) {
11624                         udp->uh_ulen = htons(len - sizeof(struct ip));
11625                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11626                 }
11627                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11628                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11629                 /* set IPv4 length */
11630                 iph_out->ip_len = len;
11631                 /* out it goes */
11632 #ifdef  SCTP_PACKET_LOGGING
11633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11634                         sctp_packet_log(mout, len);
11635 #endif
11636                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11637                 if (port) {
11638 #if defined(SCTP_WITH_NO_CSUM)
11639                         SCTP_STAT_INCR(sctps_sendnocrc);
11640 #else
11641                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11642                         SCTP_STAT_INCR(sctps_sendswcrc);
11643 #endif
11644                         SCTP_ENABLE_UDP_CSUM(o_pak);
11645                 } else {
11646 #if defined(SCTP_WITH_NO_CSUM)
11647                         SCTP_STAT_INCR(sctps_sendnocrc);
11648 #else
11649                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11650                         mout->m_pkthdr.csum_data = 0;
11651                         SCTP_STAT_INCR(sctps_sendhwcrc);
11652 #endif
11653                 }
11654                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11655
11656                 /* Free the route if we got one back */
11657                 if (ro.ro_rt)
11658                         RTFREE(ro.ro_rt);
11659         }
11660 #ifdef INET6
11661         if (ip6_out != NULL) {
11662                 struct route_in6 ro;
11663                 int ret;
11664                 struct ifnet *ifp = NULL;
11665
11666                 /* zap the stack pointer to the route */
11667                 bzero(&ro, sizeof(ro));
11668                 if (port) {
11669                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11670                 }
11671                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11672                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11673                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11674 #ifdef  SCTP_PACKET_LOGGING
11675                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11676                         sctp_packet_log(mout, len);
11677 #endif
11678                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11679                 if (port) {
11680 #if defined(SCTP_WITH_NO_CSUM)
11681                         SCTP_STAT_INCR(sctps_sendnocrc);
11682 #else
11683                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11684                         SCTP_STAT_INCR(sctps_sendswcrc);
11685 #endif
11686                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11687                                 udp->uh_sum = 0xffff;
11688                         }
11689                 } else {
11690 #if defined(SCTP_WITH_NO_CSUM)
11691                         SCTP_STAT_INCR(sctps_sendnocrc);
11692 #else
11693                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11694                         mout->m_pkthdr.csum_data = 0;
11695                         SCTP_STAT_INCR(sctps_sendhwcrc);
11696 #endif
11697                 }
11698                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11699
11700                 /* Free the route if we got one back */
11701                 if (ro.ro_rt)
11702                         RTFREE(ro.ro_rt);
11703         }
11704 #endif
11705         SCTP_STAT_INCR(sctps_sendpackets);
11706         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11707         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11708 }
11709
11710 void
11711 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11712     uint32_t vrf_id, uint16_t port)
11713 {
11714         struct mbuf *o_pak;
11715         struct sctphdr *sh, *sh_out;
11716         struct sctp_chunkhdr *ch;
11717         struct ip *iph, *iph_out;
11718         struct udphdr *udp = NULL;
11719         struct mbuf *mout;
11720
11721 #ifdef INET6
11722         struct ip6_hdr *ip6, *ip6_out;
11723
11724 #endif
11725         int iphlen_out, len;
11726
11727         iph = mtod(m, struct ip *);
11728         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11729         switch (iph->ip_v) {
11730         case IPVERSION:
11731                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11732                 break;
11733 #ifdef INET6
11734         case IPV6_VERSION >> 4:
11735                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11736                 break;
11737 #endif
11738         default:
11739                 if (scm) {
11740                         sctp_m_freem(scm);
11741                 }
11742                 return;
11743         }
11744         if (port) {
11745                 len += sizeof(struct udphdr);
11746         }
11747         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11748         if (mout == NULL) {
11749                 if (scm) {
11750                         sctp_m_freem(scm);
11751                 }
11752                 return;
11753         }
11754         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11755         SCTP_BUF_LEN(mout) = len;
11756         SCTP_BUF_NEXT(mout) = scm;
11757         iph_out = NULL;
11758 #ifdef INET6
11759         ip6_out = NULL;
11760 #endif
11761         switch (iph->ip_v) {
11762         case IPVERSION:
11763                 iph_out = mtod(mout, struct ip *);
11764
11765                 /* Fill in the IP header for the ABORT */
11766                 iph_out->ip_v = IPVERSION;
11767                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11768                 iph_out->ip_tos = (u_char)0;
11769                 iph_out->ip_id = 0;
11770                 iph_out->ip_off = 0;
11771                 iph_out->ip_ttl = MAXTTL;
11772                 if (port) {
11773                         iph_out->ip_p = IPPROTO_UDP;
11774                 } else {
11775                         iph_out->ip_p = IPPROTO_SCTP;
11776                 }
11777                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11778                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11779                 /* let IP layer calculate this */
11780                 iph_out->ip_sum = 0;
11781
11782                 iphlen_out = sizeof(struct ip);
11783                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11784                 break;
11785 #ifdef INET6
11786         case IPV6_VERSION >> 4:
11787                 ip6 = (struct ip6_hdr *)iph;
11788                 ip6_out = mtod(mout, struct ip6_hdr *);
11789
11790                 /* Fill in the IP6 header for the ABORT */
11791                 ip6_out->ip6_flow = ip6->ip6_flow;
11792                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11793                 if (port) {
11794                         ip6_out->ip6_nxt = IPPROTO_UDP;
11795                 } else {
11796                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11797                 }
11798                 ip6_out->ip6_src = ip6->ip6_dst;
11799                 ip6_out->ip6_dst = ip6->ip6_src;
11800
11801                 iphlen_out = sizeof(struct ip6_hdr);
11802                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11803                 break;
11804 #endif                          /* INET6 */
11805         default:
11806                 /* Currently not supported */
11807                 sctp_m_freem(mout);
11808                 return;
11809         }
11810
11811         udp = (struct udphdr *)sh_out;
11812         if (port) {
11813                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11814                 udp->uh_dport = port;
11815                 /* set udp->uh_ulen later */
11816                 udp->uh_sum = 0;
11817                 iphlen_out += sizeof(struct udphdr);
11818                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11819         }
11820         sh_out->src_port = sh->dest_port;
11821         sh_out->dest_port = sh->src_port;
11822         sh_out->v_tag = vtag;
11823         sh_out->checksum = 0;
11824
11825         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11826         ch->chunk_type = SCTP_OPERATION_ERROR;
11827         ch->chunk_flags = 0;
11828
11829         if (scm) {
11830                 struct mbuf *m_tmp = scm;
11831                 int cause_len = 0;
11832
11833                 /* get length of the err_cause chain */
11834                 while (m_tmp != NULL) {
11835                         cause_len += SCTP_BUF_LEN(m_tmp);
11836                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11837                 }
11838                 len = SCTP_BUF_LEN(mout) + cause_len;
11839                 if (cause_len % 4) {
11840                         /* need pad at end of chunk */
11841                         uint32_t cpthis = 0;
11842                         int padlen;
11843
11844                         padlen = 4 - (len % 4);
11845                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11846                         len += padlen;
11847                 }
11848                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11849         } else {
11850                 len = SCTP_BUF_LEN(mout);
11851                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11852         }
11853
11854         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11855                 /* no mbuf's */
11856                 sctp_m_freem(mout);
11857                 return;
11858         }
11859         if (iph_out != NULL) {
11860                 sctp_route_t ro;
11861                 int ret;
11862
11863                 /* zap the stack pointer to the route */
11864                 bzero(&ro, sizeof ro);
11865                 if (port) {
11866                         udp->uh_ulen = htons(len - sizeof(struct ip));
11867                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11868                 }
11869                 /* set IPv4 length */
11870                 iph_out->ip_len = len;
11871                 /* out it goes */
11872 #ifdef  SCTP_PACKET_LOGGING
11873                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11874                         sctp_packet_log(mout, len);
11875 #endif
11876                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11877                 if (port) {
11878 #if defined(SCTP_WITH_NO_CSUM)
11879                         SCTP_STAT_INCR(sctps_sendnocrc);
11880 #else
11881                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11882                         SCTP_STAT_INCR(sctps_sendswcrc);
11883 #endif
11884                         SCTP_ENABLE_UDP_CSUM(o_pak);
11885                 } else {
11886 #if defined(SCTP_WITH_NO_CSUM)
11887                         SCTP_STAT_INCR(sctps_sendnocrc);
11888 #else
11889                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11890                         mout->m_pkthdr.csum_data = 0;
11891                         SCTP_STAT_INCR(sctps_sendhwcrc);
11892 #endif
11893                 }
11894                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11895
11896                 /* Free the route if we got one back */
11897                 if (ro.ro_rt)
11898                         RTFREE(ro.ro_rt);
11899         }
11900 #ifdef INET6
11901         if (ip6_out != NULL) {
11902                 struct route_in6 ro;
11903                 int ret;
11904                 struct ifnet *ifp = NULL;
11905
11906                 /* zap the stack pointer to the route */
11907                 bzero(&ro, sizeof(ro));
11908                 if (port) {
11909                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11910                 }
11911                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11912 #ifdef  SCTP_PACKET_LOGGING
11913                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11914                         sctp_packet_log(mout, len);
11915 #endif
11916                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11917                 if (port) {
11918 #if defined(SCTP_WITH_NO_CSUM)
11919                         SCTP_STAT_INCR(sctps_sendnocrc);
11920 #else
11921                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11922                         SCTP_STAT_INCR(sctps_sendswcrc);
11923 #endif
11924                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11925                                 udp->uh_sum = 0xffff;
11926                         }
11927                 } else {
11928 #if defined(SCTP_WITH_NO_CSUM)
11929                         SCTP_STAT_INCR(sctps_sendnocrc);
11930 #else
11931                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11932                         mout->m_pkthdr.csum_data = 0;
11933                         SCTP_STAT_INCR(sctps_sendhwcrc);
11934 #endif
11935                 }
11936                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11937
11938                 /* Free the route if we got one back */
11939                 if (ro.ro_rt)
11940                         RTFREE(ro.ro_rt);
11941         }
11942 #endif
11943         SCTP_STAT_INCR(sctps_sendpackets);
11944         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11945         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11946 }
11947
11948 static struct mbuf *
11949 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11950     struct uio *uio,
11951     struct sctp_sndrcvinfo *srcv,
11952     int max_send_len,
11953     int user_marks_eor,
11954     int *error,
11955     uint32_t * sndout,
11956     struct mbuf **new_tail)
11957 {
11958         struct mbuf *m;
11959
11960         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11961             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11962         if (m == NULL) {
11963                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11964                 *error = ENOMEM;
11965         } else {
11966                 *sndout = m_length(m, NULL);
11967                 *new_tail = m_last(m);
11968         }
11969         return (m);
11970 }
11971
11972 static int
11973 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11974     struct uio *uio,
11975     int resv_upfront)
11976 {
11977         int left;
11978
11979         left = sp->length;
11980         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11981             resv_upfront, 0);
11982         if (sp->data == NULL) {
11983                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11984                 return (ENOMEM);
11985         }
11986         sp->tail_mbuf = m_last(sp->data);
11987         return (0);
11988 }
11989
11990
11991
11992 static struct sctp_stream_queue_pending *
11993 sctp_copy_it_in(struct sctp_tcb *stcb,
11994     struct sctp_association *asoc,
11995     struct sctp_sndrcvinfo *srcv,
11996     struct uio *uio,
11997     struct sctp_nets *net,
11998     int max_send_len,
11999     int user_marks_eor,
12000     int *error,
12001     int non_blocking)
12002 {
12003         /*-
12004          * This routine must be very careful in its work. Protocol
12005          * processing is up and running so care must be taken to spl...()
12006          * when you need to do something that may effect the stcb/asoc. The
12007          * sb is locked however. When data is copied the protocol processing
12008          * should be enabled since this is a slower operation...
12009          */
12010         struct sctp_stream_queue_pending *sp = NULL;
12011         int resv_in_first;
12012
12013         *error = 0;
12014         /* Now can we send this? */
12015         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12016             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12017             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12018             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12019                 /* got data while shutting down */
12020                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12021                 *error = ECONNRESET;
12022                 goto out_now;
12023         }
12024         sctp_alloc_a_strmoq(stcb, sp);
12025         if (sp == NULL) {
12026                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12027                 *error = ENOMEM;
12028                 goto out_now;
12029         }
12030         sp->act_flags = 0;
12031         sp->sender_all_done = 0;
12032         sp->sinfo_flags = srcv->sinfo_flags;
12033         sp->timetolive = srcv->sinfo_timetolive;
12034         sp->ppid = srcv->sinfo_ppid;
12035         sp->context = srcv->sinfo_context;
12036         sp->strseq = 0;
12037         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12038
12039         sp->stream = srcv->sinfo_stream;
12040         sp->length = min(uio->uio_resid, max_send_len);
12041         if ((sp->length == (uint32_t) uio->uio_resid) &&
12042             ((user_marks_eor == 0) ||
12043             (srcv->sinfo_flags & SCTP_EOF) ||
12044             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12045                 sp->msg_is_complete = 1;
12046         } else {
12047                 sp->msg_is_complete = 0;
12048         }
12049         sp->sender_all_done = 0;
12050         sp->some_taken = 0;
12051         sp->put_last_out = 0;
12052         resv_in_first = sizeof(struct sctp_data_chunk);
12053         sp->data = sp->tail_mbuf = NULL;
12054         if (sp->length == 0) {
12055                 *error = 0;
12056                 goto skip_copy;
12057         }
12058         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12059         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12060                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12061                 sp->holds_key_ref = 1;
12062         }
12063         *error = sctp_copy_one(sp, uio, resv_in_first);
12064 skip_copy:
12065         if (*error) {
12066                 sctp_free_a_strmoq(stcb, sp);
12067                 sp = NULL;
12068         } else {
12069                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12070                         sp->net = net;
12071                         atomic_add_int(&sp->net->ref_count, 1);
12072                 } else {
12073                         sp->net = NULL;
12074                 }
12075                 sctp_set_prsctp_policy(sp);
12076         }
12077 out_now:
12078         return (sp);
12079 }
12080
12081
12082 int
12083 sctp_sosend(struct socket *so,
12084     struct sockaddr *addr,
12085     struct uio *uio,
12086     struct mbuf *top,
12087     struct mbuf *control,
12088     int flags,
12089     struct thread *p
12090 )
12091 {
12092         int error, use_rcvinfo = 0;
12093         struct sctp_sndrcvinfo srcv;
12094         struct sockaddr *addr_to_use;
12095
12096 #if defined(INET) && defined(INET6)
12097         struct sockaddr_in sin;
12098
12099 #endif
12100
12101         if (control) {
12102                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12103                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12104                     sizeof(srcv))) {
12105                         /* got one */
12106                         use_rcvinfo = 1;
12107                 }
12108         }
12109         addr_to_use = addr;
12110 #if defined(INET) && defined(INET6)
12111         if ((addr) && (addr->sa_family == AF_INET6)) {
12112                 struct sockaddr_in6 *sin6;
12113
12114                 sin6 = (struct sockaddr_in6 *)addr;
12115                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12116                         in6_sin6_2_sin(&sin, sin6);
12117                         addr_to_use = (struct sockaddr *)&sin;
12118                 }
12119         }
12120 #endif
12121         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12122             control,
12123             flags,
12124             use_rcvinfo ? &srcv : NULL
12125             ,p
12126             );
12127         return (error);
12128 }
12129
12130
12131 int
12132 sctp_lower_sosend(struct socket *so,
12133     struct sockaddr *addr,
12134     struct uio *uio,
12135     struct mbuf *i_pak,
12136     struct mbuf *control,
12137     int flags,
12138     struct sctp_sndrcvinfo *srcv
12139     ,
12140     struct thread *p
12141 )
12142 {
12143         unsigned int sndlen = 0, max_len;
12144         int error, len;
12145         struct mbuf *top = NULL;
12146         int queue_only = 0, queue_only_for_init = 0;
12147         int free_cnt_applied = 0;
12148         int un_sent;
12149         int now_filled = 0;
12150         unsigned int inqueue_bytes = 0;
12151         struct sctp_block_entry be;
12152         struct sctp_inpcb *inp;
12153         struct sctp_tcb *stcb = NULL;
12154         struct timeval now;
12155         struct sctp_nets *net;
12156         struct sctp_association *asoc;
12157         struct sctp_inpcb *t_inp;
12158         int user_marks_eor;
12159         int create_lock_applied = 0;
12160         int nagle_applies = 0;
12161         int some_on_control = 0;
12162         int got_all_of_the_send = 0;
12163         int hold_tcblock = 0;
12164         int non_blocking = 0;
12165         uint32_t local_add_more, local_soresv = 0;
12166         uint16_t port;
12167         uint16_t sinfo_flags;
12168         sctp_assoc_t sinfo_assoc_id;
12169
12170         error = 0;
12171         net = NULL;
12172         stcb = NULL;
12173         asoc = NULL;
12174
12175         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12176         if (inp == NULL) {
12177                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12178                 error = EINVAL;
12179                 if (i_pak) {
12180                         SCTP_RELEASE_PKT(i_pak);
12181                 }
12182                 return (error);
12183         }
12184         if ((uio == NULL) && (i_pak == NULL)) {
12185                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12186                 return (EINVAL);
12187         }
12188         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12189         atomic_add_int(&inp->total_sends, 1);
12190         if (uio) {
12191                 if (uio->uio_resid < 0) {
12192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12193                         return (EINVAL);
12194                 }
12195                 sndlen = uio->uio_resid;
12196         } else {
12197                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12198                 sndlen = SCTP_HEADER_LEN(i_pak);
12199         }
12200         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12201             addr,
12202             sndlen);
12203         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12204             (inp->sctp_socket->so_qlimit)) {
12205                 /* The listener can NOT send */
12206                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12207                 error = ENOTCONN;
12208                 goto out_unlocked;
12209         }
12210         /**
12211          * Pre-screen address, if one is given the sin-len
12212          * must be set correctly!
12213          */
12214         if (addr) {
12215                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12216
12217                 switch (raddr->sa.sa_family) {
12218 #if defined(INET)
12219                 case AF_INET:
12220                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12221                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12222                                 error = EINVAL;
12223                                 goto out_unlocked;
12224                         }
12225                         port = raddr->sin.sin_port;
12226                         break;
12227 #endif
12228 #if defined(INET6)
12229                 case AF_INET6:
12230                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12231                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12232                                 error = EINVAL;
12233                                 goto out_unlocked;
12234                         }
12235                         port = raddr->sin6.sin6_port;
12236                         break;
12237 #endif
12238                 default:
12239                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12240                         error = EAFNOSUPPORT;
12241                         goto out_unlocked;
12242                 }
12243         } else
12244                 port = 0;
12245
12246         if (srcv) {
12247                 sinfo_flags = srcv->sinfo_flags;
12248                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12249                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12250                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12251                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12252                         error = EINVAL;
12253                         goto out_unlocked;
12254                 }
12255                 if (srcv->sinfo_flags)
12256                         SCTP_STAT_INCR(sctps_sends_with_flags);
12257         } else {
12258                 sinfo_flags = inp->def_send.sinfo_flags;
12259                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12260         }
12261         if (sinfo_flags & SCTP_SENDALL) {
12262                 /* its a sendall */
12263                 error = sctp_sendall(inp, uio, top, srcv);
12264                 top = NULL;
12265                 goto out_unlocked;
12266         }
12267         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12268                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12269                 error = EINVAL;
12270                 goto out_unlocked;
12271         }
12272         /* now we must find the assoc */
12273         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12274             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12275                 SCTP_INP_RLOCK(inp);
12276                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12277                 if (stcb == NULL) {
12278                         SCTP_INP_RUNLOCK(inp);
12279                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12280                         error = ENOTCONN;
12281                         goto out_unlocked;
12282                 }
12283                 SCTP_TCB_LOCK(stcb);
12284                 hold_tcblock = 1;
12285                 SCTP_INP_RUNLOCK(inp);
12286         } else if (sinfo_assoc_id) {
12287                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12288         } else if (addr) {
12289                 /*-
12290                  * Since we did not use findep we must
12291                  * increment it, and if we don't find a tcb
12292                  * decrement it.
12293                  */
12294                 SCTP_INP_WLOCK(inp);
12295                 SCTP_INP_INCR_REF(inp);
12296                 SCTP_INP_WUNLOCK(inp);
12297                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12298                 if (stcb == NULL) {
12299                         SCTP_INP_WLOCK(inp);
12300                         SCTP_INP_DECR_REF(inp);
12301                         SCTP_INP_WUNLOCK(inp);
12302                 } else {
12303                         hold_tcblock = 1;
12304                 }
12305         }
12306         if ((stcb == NULL) && (addr)) {
12307                 /* Possible implicit send? */
12308                 SCTP_ASOC_CREATE_LOCK(inp);
12309                 create_lock_applied = 1;
12310                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12311                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12312                         /* Should I really unlock ? */
12313                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12314                         error = EINVAL;
12315                         goto out_unlocked;
12316
12317                 }
12318                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12319                     (addr->sa_family == AF_INET6)) {
12320                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12321                         error = EINVAL;
12322                         goto out_unlocked;
12323                 }
12324                 SCTP_INP_WLOCK(inp);
12325                 SCTP_INP_INCR_REF(inp);
12326                 SCTP_INP_WUNLOCK(inp);
12327                 /* With the lock applied look again */
12328                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12329                 if (stcb == NULL) {
12330                         SCTP_INP_WLOCK(inp);
12331                         SCTP_INP_DECR_REF(inp);
12332                         SCTP_INP_WUNLOCK(inp);
12333                 } else {
12334                         hold_tcblock = 1;
12335                 }
12336                 if (t_inp != inp) {
12337                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12338                         error = ENOTCONN;
12339                         goto out_unlocked;
12340                 }
12341         }
12342         if (stcb == NULL) {
12343                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12344                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12345                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12346                         error = ENOTCONN;
12347                         goto out_unlocked;
12348                 }
12349                 if (addr == NULL) {
12350                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12351                         error = ENOENT;
12352                         goto out_unlocked;
12353                 } else {
12354                         /*
12355                          * UDP style, we must go ahead and start the INIT
12356                          * process
12357                          */
12358                         uint32_t vrf_id;
12359
12360                         if ((sinfo_flags & SCTP_ABORT) ||
12361                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12362                                 /*-
12363                                  * User asks to abort a non-existant assoc,
12364                                  * or EOF a non-existant assoc with no data
12365                                  */
12366                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12367                                 error = ENOENT;
12368                                 goto out_unlocked;
12369                         }
12370                         /* get an asoc/stcb struct */
12371                         vrf_id = inp->def_vrf_id;
12372 #ifdef INVARIANTS
12373                         if (create_lock_applied == 0) {
12374                                 panic("Error, should hold create lock and I don't?");
12375                         }
12376 #endif
12377                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12378                             p
12379                             );
12380                         if (stcb == NULL) {
12381                                 /* Error is setup for us in the call */
12382                                 goto out_unlocked;
12383                         }
12384                         if (create_lock_applied) {
12385                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12386                                 create_lock_applied = 0;
12387                         } else {
12388                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12389                         }
12390                         /*
12391                          * Turn on queue only flag to prevent data from
12392                          * being sent
12393                          */
12394                         queue_only = 1;
12395                         asoc = &stcb->asoc;
12396                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12397                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12398
12399                         /* initialize authentication params for the assoc */
12400                         sctp_initialize_auth_params(inp, stcb);
12401
12402                         if (control) {
12403                                 /*
12404                                  * see if a init structure exists in cmsg
12405                                  * headers
12406                                  */
12407                                 struct sctp_initmsg initm;
12408                                 int i;
12409
12410                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12411                                     sizeof(initm))) {
12412                                         /*
12413                                          * we have an INIT override of the
12414                                          * default
12415                                          */
12416                                         if (initm.sinit_max_attempts)
12417                                                 asoc->max_init_times = initm.sinit_max_attempts;
12418                                         if (initm.sinit_num_ostreams)
12419                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12420                                         if (initm.sinit_max_instreams)
12421                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12422                                         if (initm.sinit_max_init_timeo)
12423                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12424                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12425                                                 struct sctp_stream_out *tmp_str;
12426                                                 int had_lock = 0;
12427
12428                                                 /* Default is NOT correct */
12429                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12430                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12431                                                 /*
12432                                                  * What happens if this
12433                                                  * fails? we panic ...
12434                                                  */
12435
12436                                                 if (hold_tcblock) {
12437                                                         had_lock = 1;
12438                                                         SCTP_TCB_UNLOCK(stcb);
12439                                                 }
12440                                                 SCTP_MALLOC(tmp_str,
12441                                                     struct sctp_stream_out *,
12442                                                     (asoc->pre_open_streams *
12443                                                     sizeof(struct sctp_stream_out)),
12444                                                     SCTP_M_STRMO);
12445                                                 if (had_lock) {
12446                                                         SCTP_TCB_LOCK(stcb);
12447                                                 }
12448                                                 if (tmp_str != NULL) {
12449                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12450                                                         asoc->strmout = tmp_str;
12451                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12452                                                 } else {
12453                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12454                                                 }
12455                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12456                                                         /*-
12457                                                          * inbound side must be set
12458                                                          * to 0xffff, also NOTE when
12459                                                          * we get the INIT-ACK back
12460                                                          * (for INIT sender) we MUST
12461                                                          * reduce the count
12462                                                          * (streamoutcnt) but first
12463                                                          * check if we sent to any
12464                                                          * of the upper streams that
12465                                                          * were dropped (if some
12466                                                          * were). Those that were
12467                                                          * dropped must be notified
12468                                                          * to the upper layer as
12469                                                          * failed to send.
12470                                                          */
12471                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12472                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12473                                                         asoc->strmout[i].stream_no = i;
12474                                                         asoc->strmout[i].last_msg_incomplete = 0;
12475                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12476                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12477                                                 }
12478                                         }
12479                                 }
12480                         }
12481                         hold_tcblock = 1;
12482                         /* out with the INIT */
12483                         queue_only_for_init = 1;
12484                         /*-
12485                          * we may want to dig in after this call and adjust the MTU
12486                          * value. It defaulted to 1500 (constant) but the ro
12487                          * structure may now have an update and thus we may need to
12488                          * change it BEFORE we append the message.
12489                          */
12490                 }
12491         } else
12492                 asoc = &stcb->asoc;
12493         if (srcv == NULL)
12494                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12495         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12496                 if (addr)
12497                         net = sctp_findnet(stcb, addr);
12498                 else
12499                         net = NULL;
12500                 if ((net == NULL) ||
12501                     ((port != 0) && (port != stcb->rport))) {
12502                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12503                         error = EINVAL;
12504                         goto out_unlocked;
12505                 }
12506         } else {
12507                 net = stcb->asoc.primary_destination;
12508         }
12509         atomic_add_int(&stcb->total_sends, 1);
12510         /* Keep the stcb from being freed under our feet */
12511         atomic_add_int(&asoc->refcnt, 1);
12512         free_cnt_applied = 1;
12513
12514         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12515                 if (sndlen > asoc->smallest_mtu) {
12516                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12517                         error = EMSGSIZE;
12518                         goto out_unlocked;
12519                 }
12520         }
12521         if ((SCTP_SO_IS_NBIO(so)
12522             || (flags & MSG_NBIO)
12523             )) {
12524                 non_blocking = 1;
12525         }
12526         /* would we block? */
12527         if (non_blocking) {
12528                 if (hold_tcblock == 0) {
12529                         SCTP_TCB_LOCK(stcb);
12530                         hold_tcblock = 1;
12531                 }
12532                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12533                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12534                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12535                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12536                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12537                                 error = EMSGSIZE;
12538                         else
12539                                 error = EWOULDBLOCK;
12540                         goto out_unlocked;
12541                 }
12542                 stcb->asoc.sb_send_resv += sndlen;
12543                 SCTP_TCB_UNLOCK(stcb);
12544                 hold_tcblock = 0;
12545         } else {
12546                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12547         }
12548         local_soresv = sndlen;
12549         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12550                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12551                 error = ECONNRESET;
12552                 goto out_unlocked;
12553         }
12554         if (create_lock_applied) {
12555                 SCTP_ASOC_CREATE_UNLOCK(inp);
12556                 create_lock_applied = 0;
12557         }
12558         if (asoc->stream_reset_outstanding) {
12559                 /*
12560                  * Can't queue any data while stream reset is underway.
12561                  */
12562                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12563                 error = EAGAIN;
12564                 goto out_unlocked;
12565         }
12566         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12567             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12568                 queue_only = 1;
12569         }
12570         /* we are now done with all control */
12571         if (control) {
12572                 sctp_m_freem(control);
12573                 control = NULL;
12574         }
12575         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12576             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12577             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12578             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12579                 if (srcv->sinfo_flags & SCTP_ABORT) {
12580                         ;
12581                 } else {
12582                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12583                         error = ECONNRESET;
12584                         goto out_unlocked;
12585                 }
12586         }
12587         /* Ok, we will attempt a msgsnd :> */
12588         if (p) {
12589                 p->td_ru.ru_msgsnd++;
12590         }
12591         /* Are we aborting? */
12592         if (srcv->sinfo_flags & SCTP_ABORT) {
12593                 struct mbuf *mm;
12594                 int tot_demand, tot_out = 0, max_out;
12595
12596                 SCTP_STAT_INCR(sctps_sends_with_abort);
12597                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12598                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12599                         /* It has to be up before we abort */
12600                         /* how big is the user initiated abort? */
12601                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12602                         error = EINVAL;
12603                         goto out;
12604                 }
12605                 if (hold_tcblock) {
12606                         SCTP_TCB_UNLOCK(stcb);
12607                         hold_tcblock = 0;
12608                 }
12609                 if (top) {
12610                         struct mbuf *cntm = NULL;
12611
12612                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12613                         if (sndlen != 0) {
12614                                 cntm = top;
12615                                 while (cntm) {
12616                                         tot_out += SCTP_BUF_LEN(cntm);
12617                                         cntm = SCTP_BUF_NEXT(cntm);
12618                                 }
12619                         }
12620                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12621                 } else {
12622                         /* Must fit in a MTU */
12623                         tot_out = sndlen;
12624                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12625                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12626                                 /* To big */
12627                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12628                                 error = EMSGSIZE;
12629                                 goto out;
12630                         }
12631                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12632                 }
12633                 if (mm == NULL) {
12634                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12635                         error = ENOMEM;
12636                         goto out;
12637                 }
12638                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12639                 max_out -= sizeof(struct sctp_abort_msg);
12640                 if (tot_out > max_out) {
12641                         tot_out = max_out;
12642                 }
12643                 if (mm) {
12644                         struct sctp_paramhdr *ph;
12645
12646                         /* now move forward the data pointer */
12647                         ph = mtod(mm, struct sctp_paramhdr *);
12648                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12649                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12650                         ph++;
12651                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12652                         if (top == NULL) {
12653                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12654                                 if (error) {
12655                                         /*-
12656                                          * Here if we can't get his data we
12657                                          * still abort we just don't get to
12658                                          * send the users note :-0
12659                                          */
12660                                         sctp_m_freem(mm);
12661                                         mm = NULL;
12662                                 }
12663                         } else {
12664                                 if (sndlen != 0) {
12665                                         SCTP_BUF_NEXT(mm) = top;
12666                                 }
12667                         }
12668                 }
12669                 if (hold_tcblock == 0) {
12670                         SCTP_TCB_LOCK(stcb);
12671                         hold_tcblock = 1;
12672                 }
12673                 atomic_add_int(&stcb->asoc.refcnt, -1);
12674                 free_cnt_applied = 0;
12675                 /* release this lock, otherwise we hang on ourselves */
12676                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12677                     SCTP_RESPONSE_TO_USER_REQ,
12678                     mm, SCTP_SO_LOCKED);
12679                 /* now relock the stcb so everything is sane */
12680                 hold_tcblock = 0;
12681                 stcb = NULL;
12682                 /*
12683                  * In this case top is already chained to mm avoid double
12684                  * free, since we free it below if top != NULL and driver
12685                  * would free it after sending the packet out
12686                  */
12687                 if (sndlen != 0) {
12688                         top = NULL;
12689                 }
12690                 goto out_unlocked;
12691         }
12692         /* Calculate the maximum we can send */
12693         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12694         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12695                 if (non_blocking) {
12696                         /* we already checked for non-blocking above. */
12697                         max_len = sndlen;
12698                 } else {
12699                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12700                 }
12701         } else {
12702                 max_len = 0;
12703         }
12704         if (hold_tcblock) {
12705                 SCTP_TCB_UNLOCK(stcb);
12706                 hold_tcblock = 0;
12707         }
12708         /* Is the stream no. valid? */
12709         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12710                 /* Invalid stream number */
12711                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12712                 error = EINVAL;
12713                 goto out_unlocked;
12714         }
12715         if (asoc->strmout == NULL) {
12716                 /* huh? software error */
12717                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12718                 error = EFAULT;
12719                 goto out_unlocked;
12720         }
12721         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12722         if ((user_marks_eor == 0) &&
12723             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12724                 /* It will NEVER fit */
12725                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12726                 error = EMSGSIZE;
12727                 goto out_unlocked;
12728         }
12729         if ((uio == NULL) && user_marks_eor) {
12730                 /*-
12731                  * We do not support eeor mode for
12732                  * sending with mbuf chains (like sendfile).
12733                  */
12734                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12735                 error = EINVAL;
12736                 goto out_unlocked;
12737         }
12738         if (user_marks_eor) {
12739                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12740         } else {
12741                 /*-
12742                  * For non-eeor the whole message must fit in
12743                  * the socket send buffer.
12744                  */
12745                 local_add_more = sndlen;
12746         }
12747         len = 0;
12748         if (non_blocking) {
12749                 goto skip_preblock;
12750         }
12751         if (((max_len <= local_add_more) &&
12752             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12753             (max_len == 0) ||
12754             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12755                 /* No room right now ! */
12756                 SOCKBUF_LOCK(&so->so_snd);
12757                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12758                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12759                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12760                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12761                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12762                             inqueue_bytes,
12763                             local_add_more,
12764                             stcb->asoc.stream_queue_cnt,
12765                             stcb->asoc.chunks_on_out_queue,
12766                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12767                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12768                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12769                         }
12770                         be.error = 0;
12771                         stcb->block_entry = &be;
12772                         error = sbwait(&so->so_snd);
12773                         stcb->block_entry = NULL;
12774                         if (error || so->so_error || be.error) {
12775                                 if (error == 0) {
12776                                         if (so->so_error)
12777                                                 error = so->so_error;
12778                                         if (be.error) {
12779                                                 error = be.error;
12780                                         }
12781                                 }
12782                                 SOCKBUF_UNLOCK(&so->so_snd);
12783                                 goto out_unlocked;
12784                         }
12785                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12786                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12787                                     so, asoc, stcb->asoc.total_output_queue_size);
12788                         }
12789                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12790                                 goto out_unlocked;
12791                         }
12792                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12793                 }
12794                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12795                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12796                 } else {
12797                         max_len = 0;
12798                 }
12799                 SOCKBUF_UNLOCK(&so->so_snd);
12800         }
12801 skip_preblock:
12802         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12803                 goto out_unlocked;
12804         }
12805         /*
12806          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12807          * case NOTE: uio will be null when top/mbuf is passed
12808          */
12809         if (sndlen == 0) {
12810                 if (srcv->sinfo_flags & SCTP_EOF) {
12811                         got_all_of_the_send = 1;
12812                         goto dataless_eof;
12813                 } else {
12814                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12815                         error = EINVAL;
12816                         goto out;
12817                 }
12818         }
12819         if (top == NULL) {
12820                 struct sctp_stream_queue_pending *sp;
12821                 struct sctp_stream_out *strm;
12822                 uint32_t sndout;
12823
12824                 SCTP_TCB_SEND_LOCK(stcb);
12825                 if ((asoc->stream_locked) &&
12826                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12827                         SCTP_TCB_SEND_UNLOCK(stcb);
12828                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12829                         error = EINVAL;
12830                         goto out;
12831                 }
12832                 SCTP_TCB_SEND_UNLOCK(stcb);
12833
12834                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12835                 if (strm->last_msg_incomplete == 0) {
12836         do_a_copy_in:
12837                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12838                         if ((sp == NULL) || (error)) {
12839                                 goto out;
12840                         }
12841                         SCTP_TCB_SEND_LOCK(stcb);
12842                         if (sp->msg_is_complete) {
12843                                 strm->last_msg_incomplete = 0;
12844                                 asoc->stream_locked = 0;
12845                         } else {
12846                                 /*
12847                                  * Just got locked to this guy in case of an
12848                                  * interrupt.
12849                                  */
12850                                 strm->last_msg_incomplete = 1;
12851                                 asoc->stream_locked = 1;
12852                                 asoc->stream_locked_on = srcv->sinfo_stream;
12853                                 sp->sender_all_done = 0;
12854                         }
12855                         sctp_snd_sb_alloc(stcb, sp->length);
12856                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12857                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12858                                 sp->strseq = strm->next_sequence_sent;
12859                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12860                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12861                                             (uintptr_t) stcb, sp->length,
12862                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12863                                 }
12864                                 strm->next_sequence_sent++;
12865                         } else {
12866                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12867                         }
12868                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12869                         if ((strm->next_spoke.tqe_next == NULL) &&
12870                             (strm->next_spoke.tqe_prev == NULL)) {
12871                                 /* Not on wheel, insert */
12872                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12873                         }
12874                         SCTP_TCB_SEND_UNLOCK(stcb);
12875                 } else {
12876                         SCTP_TCB_SEND_LOCK(stcb);
12877                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12878                         SCTP_TCB_SEND_UNLOCK(stcb);
12879                         if (sp == NULL) {
12880                                 /* ???? Huh ??? last msg is gone */
12881 #ifdef INVARIANTS
12882                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12883 #else
12884                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12885                                 strm->last_msg_incomplete = 0;
12886 #endif
12887                                 goto do_a_copy_in;
12888
12889                         }
12890                 }
12891                 while (uio->uio_resid > 0) {
12892                         /* How much room do we have? */
12893                         struct mbuf *new_tail, *mm;
12894
12895                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12896                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12897                         else
12898                                 max_len = 0;
12899
12900                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12901                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12902                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12903                                 sndout = 0;
12904                                 new_tail = NULL;
12905                                 if (hold_tcblock) {
12906                                         SCTP_TCB_UNLOCK(stcb);
12907                                         hold_tcblock = 0;
12908                                 }
12909                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12910                                 if ((mm == NULL) || error) {
12911                                         if (mm) {
12912                                                 sctp_m_freem(mm);
12913                                         }
12914                                         goto out;
12915                                 }
12916                                 /* Update the mbuf and count */
12917                                 SCTP_TCB_SEND_LOCK(stcb);
12918                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12919                                         /*
12920                                          * we need to get out. Peer probably
12921                                          * aborted.
12922                                          */
12923                                         sctp_m_freem(mm);
12924                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12925                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12926                                                 error = ECONNRESET;
12927                                         }
12928                                         SCTP_TCB_SEND_UNLOCK(stcb);
12929                                         goto out;
12930                                 }
12931                                 if (sp->tail_mbuf) {
12932                                         /* tack it to the end */
12933                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12934                                         sp->tail_mbuf = new_tail;
12935                                 } else {
12936                                         /* A stolen mbuf */
12937                                         sp->data = mm;
12938                                         sp->tail_mbuf = new_tail;
12939                                 }
12940                                 sctp_snd_sb_alloc(stcb, sndout);
12941                                 atomic_add_int(&sp->length, sndout);
12942                                 len += sndout;
12943
12944                                 /* Did we reach EOR? */
12945                                 if ((uio->uio_resid == 0) &&
12946                                     ((user_marks_eor == 0) ||
12947                                     (srcv->sinfo_flags & SCTP_EOF) ||
12948                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12949                                         sp->msg_is_complete = 1;
12950                                 } else {
12951                                         sp->msg_is_complete = 0;
12952                                 }
12953                                 SCTP_TCB_SEND_UNLOCK(stcb);
12954                         }
12955                         if (uio->uio_resid == 0) {
12956                                 /* got it all? */
12957                                 continue;
12958                         }
12959                         /* PR-SCTP? */
12960                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12961                                 /*
12962                                  * This is ugly but we must assure locking
12963                                  * order
12964                                  */
12965                                 if (hold_tcblock == 0) {
12966                                         SCTP_TCB_LOCK(stcb);
12967                                         hold_tcblock = 1;
12968                                 }
12969                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12970                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12971                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12972                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12973                                 else
12974                                         max_len = 0;
12975                                 if (max_len > 0) {
12976                                         continue;
12977                                 }
12978                                 SCTP_TCB_UNLOCK(stcb);
12979                                 hold_tcblock = 0;
12980                         }
12981                         /* wait for space now */
12982                         if (non_blocking) {
12983                                 /* Non-blocking io in place out */
12984                                 goto skip_out_eof;
12985                         }
12986                         /* What about the INIT, send it maybe */
12987                         if (queue_only_for_init) {
12988                                 if (hold_tcblock == 0) {
12989                                         SCTP_TCB_LOCK(stcb);
12990                                         hold_tcblock = 1;
12991                                 }
12992                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12993                                         /* a collision took us forward? */
12994                                         queue_only = 0;
12995                                 } else {
12996                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12997                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12998                                         queue_only = 1;
12999                                 }
13000                         }
13001                         if ((net->flight_size > net->cwnd) &&
13002                             (asoc->sctp_cmt_on_off == 0)) {
13003                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13004                                 queue_only = 1;
13005                         } else if (asoc->ifp_had_enobuf) {
13006                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13007                                 if (net->flight_size > (2 * net->mtu)) {
13008                                         queue_only = 1;
13009                                 }
13010                                 asoc->ifp_had_enobuf = 0;
13011                         }
13012                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13013                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13014                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13015                             (stcb->asoc.total_flight > 0) &&
13016                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13017                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13018
13019                                 /*-
13020                                  * Ok, Nagle is set on and we have data outstanding.
13021                                  * Don't send anything and let SACKs drive out the
13022                                  * data unless wen have a "full" segment to send.
13023                                  */
13024                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13025                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13026                                 }
13027                                 SCTP_STAT_INCR(sctps_naglequeued);
13028                                 nagle_applies = 1;
13029                         } else {
13030                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13031                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13032                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13033                                 }
13034                                 SCTP_STAT_INCR(sctps_naglesent);
13035                                 nagle_applies = 0;
13036                         }
13037                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13038
13039                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13040                                     nagle_applies, un_sent);
13041                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13042                                     stcb->asoc.total_flight,
13043                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13044                         }
13045                         if (queue_only_for_init)
13046                                 queue_only_for_init = 0;
13047                         if ((queue_only == 0) && (nagle_applies == 0)) {
13048                                 /*-
13049                                  * need to start chunk output
13050                                  * before blocking.. note that if
13051                                  * a lock is already applied, then
13052                                  * the input via the net is happening
13053                                  * and I don't need to start output :-D
13054                                  */
13055                                 if (hold_tcblock == 0) {
13056                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13057                                                 hold_tcblock = 1;
13058                                                 sctp_chunk_output(inp,
13059                                                     stcb,
13060                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13061                                         }
13062                                 } else {
13063                                         sctp_chunk_output(inp,
13064                                             stcb,
13065                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13066                                 }
13067                                 if (hold_tcblock == 1) {
13068                                         SCTP_TCB_UNLOCK(stcb);
13069                                         hold_tcblock = 0;
13070                                 }
13071                         }
13072                         SOCKBUF_LOCK(&so->so_snd);
13073                         /*-
13074                          * This is a bit strange, but I think it will
13075                          * work. The total_output_queue_size is locked and
13076                          * protected by the TCB_LOCK, which we just released.
13077                          * There is a race that can occur between releasing it
13078                          * above, and me getting the socket lock, where sacks
13079                          * come in but we have not put the SB_WAIT on the
13080                          * so_snd buffer to get the wakeup. After the LOCK
13081                          * is applied the sack_processing will also need to
13082                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13083                          * once we have the socket buffer lock if we recheck the
13084                          * size we KNOW we will get to sleep safely with the
13085                          * wakeup flag in place.
13086                          */
13087                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13088                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13089                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13090                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13091                                             so, asoc, uio->uio_resid);
13092                                 }
13093                                 be.error = 0;
13094                                 stcb->block_entry = &be;
13095                                 error = sbwait(&so->so_snd);
13096                                 stcb->block_entry = NULL;
13097
13098                                 if (error || so->so_error || be.error) {
13099                                         if (error == 0) {
13100                                                 if (so->so_error)
13101                                                         error = so->so_error;
13102                                                 if (be.error) {
13103                                                         error = be.error;
13104                                                 }
13105                                         }
13106                                         SOCKBUF_UNLOCK(&so->so_snd);
13107                                         goto out_unlocked;
13108                                 }
13109                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13110                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13111                                             so, asoc, stcb->asoc.total_output_queue_size);
13112                                 }
13113                         }
13114                         SOCKBUF_UNLOCK(&so->so_snd);
13115                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13116                                 goto out_unlocked;
13117                         }
13118                 }
13119                 SCTP_TCB_SEND_LOCK(stcb);
13120                 if (sp) {
13121                         if (sp->msg_is_complete == 0) {
13122                                 strm->last_msg_incomplete = 1;
13123                                 asoc->stream_locked = 1;
13124                                 asoc->stream_locked_on = srcv->sinfo_stream;
13125                         } else {
13126                                 sp->sender_all_done = 1;
13127                                 strm->last_msg_incomplete = 0;
13128                                 asoc->stream_locked = 0;
13129                         }
13130                 } else {
13131                         SCTP_PRINTF("Huh no sp TSNH?\n");
13132                         strm->last_msg_incomplete = 0;
13133                         asoc->stream_locked = 0;
13134                 }
13135                 SCTP_TCB_SEND_UNLOCK(stcb);
13136                 if (uio->uio_resid == 0) {
13137                         got_all_of_the_send = 1;
13138                 }
13139         } else {
13140                 /* We send in a 0, since we do NOT have any locks */
13141                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13142                 top = NULL;
13143                 if (srcv->sinfo_flags & SCTP_EOF) {
13144                         /*
13145                          * This should only happen for Panda for the mbuf
13146                          * send case, which does NOT yet support EEOR mode.
13147                          * Thus, we can just set this flag to do the proper
13148                          * EOF handling.
13149                          */
13150                         got_all_of_the_send = 1;
13151                 }
13152         }
13153         if (error) {
13154                 goto out;
13155         }
13156 dataless_eof:
13157         /* EOF thing ? */
13158         if ((srcv->sinfo_flags & SCTP_EOF) &&
13159             (got_all_of_the_send == 1) &&
13160             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13161                 int cnt;
13162
13163                 SCTP_STAT_INCR(sctps_sends_with_eof);
13164                 error = 0;
13165                 if (hold_tcblock == 0) {
13166                         SCTP_TCB_LOCK(stcb);
13167                         hold_tcblock = 1;
13168                 }
13169                 cnt = sctp_is_there_unsent_data(stcb);
13170                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13171                     TAILQ_EMPTY(&asoc->sent_queue) &&
13172                     (cnt == 0)) {
13173                         if (asoc->locked_on_sending) {
13174                                 goto abort_anyway;
13175                         }
13176                         /* there is nothing queued to send, so I'm done... */
13177                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13178                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13179                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13180                                 /* only send SHUTDOWN the first time through */
13181                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13182                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13183                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13184                                 }
13185                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13186                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13187                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13188                                     asoc->primary_destination);
13189                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13190                                     asoc->primary_destination);
13191                         }
13192                 } else {
13193                         /*-
13194                          * we still got (or just got) data to send, so set
13195                          * SHUTDOWN_PENDING
13196                          */
13197                         /*-
13198                          * XXX sockets draft says that SCTP_EOF should be
13199                          * sent with no data.  currently, we will allow user
13200                          * data to be sent first and move to
13201                          * SHUTDOWN-PENDING
13202                          */
13203                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13204                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13205                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13206                                 if (hold_tcblock == 0) {
13207                                         SCTP_TCB_LOCK(stcb);
13208                                         hold_tcblock = 1;
13209                                 }
13210                                 if (asoc->locked_on_sending) {
13211                                         /* Locked to send out the data */
13212                                         struct sctp_stream_queue_pending *sp;
13213
13214                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13215                                         if (sp) {
13216                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13217                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13218                                         }
13219                                 }
13220                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13221                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13222                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13223                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13224                         abort_anyway:
13225                                         if (free_cnt_applied) {
13226                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13227                                                 free_cnt_applied = 0;
13228                                         }
13229                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13230                                             SCTP_RESPONSE_TO_USER_REQ,
13231                                             NULL, SCTP_SO_LOCKED);
13232                                         /*
13233                                          * now relock the stcb so everything
13234                                          * is sane
13235                                          */
13236                                         hold_tcblock = 0;
13237                                         stcb = NULL;
13238                                         goto out;
13239                                 }
13240                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13241                                     asoc->primary_destination);
13242                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13243                         }
13244                 }
13245         }
13246 skip_out_eof:
13247         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13248                 some_on_control = 1;
13249         }
13250         if (queue_only_for_init) {
13251                 if (hold_tcblock == 0) {
13252                         SCTP_TCB_LOCK(stcb);
13253                         hold_tcblock = 1;
13254                 }
13255                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13256                         /* a collision took us forward? */
13257                         queue_only = 0;
13258                 } else {
13259                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13260                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13261                         queue_only = 1;
13262                 }
13263         }
13264         if ((net->flight_size > net->cwnd) &&
13265             (stcb->asoc.sctp_cmt_on_off == 0)) {
13266                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13267                 queue_only = 1;
13268         } else if (asoc->ifp_had_enobuf) {
13269                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13270                 if (net->flight_size > (2 * net->mtu)) {
13271                         queue_only = 1;
13272                 }
13273                 asoc->ifp_had_enobuf = 0;
13274         }
13275         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13276             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13277         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13278             (stcb->asoc.total_flight > 0) &&
13279             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13280             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13281                 /*-
13282                  * Ok, Nagle is set on and we have data outstanding.
13283                  * Don't send anything and let SACKs drive out the
13284                  * data unless wen have a "full" segment to send.
13285                  */
13286                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13287                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13288                 }
13289                 SCTP_STAT_INCR(sctps_naglequeued);
13290                 nagle_applies = 1;
13291         } else {
13292                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13293                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13294                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13295                 }
13296                 SCTP_STAT_INCR(sctps_naglesent);
13297                 nagle_applies = 0;
13298         }
13299         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13300                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13301                     nagle_applies, un_sent);
13302                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13303                     stcb->asoc.total_flight,
13304                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13305         }
13306         if (queue_only_for_init)
13307                 queue_only_for_init = 0;
13308         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13309                 /* we can attempt to send too. */
13310                 if (hold_tcblock == 0) {
13311                         /*
13312                          * If there is activity recv'ing sacks no need to
13313                          * send
13314                          */
13315                         if (SCTP_TCB_TRYLOCK(stcb)) {
13316                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13317                                 hold_tcblock = 1;
13318                         }
13319                 } else {
13320                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13321                 }
13322         } else if ((queue_only == 0) &&
13323                     (stcb->asoc.peers_rwnd == 0) &&
13324             (stcb->asoc.total_flight == 0)) {
13325                 /* We get to have a probe outstanding */
13326                 if (hold_tcblock == 0) {
13327                         hold_tcblock = 1;
13328                         SCTP_TCB_LOCK(stcb);
13329                 }
13330                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13331         } else if (some_on_control) {
13332                 int num_out, reason, frag_point;
13333
13334                 /* Here we do control only */
13335                 if (hold_tcblock == 0) {
13336                         hold_tcblock = 1;
13337                         SCTP_TCB_LOCK(stcb);
13338                 }
13339                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13340                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13341                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13342         }
13343         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13344             queue_only, stcb->asoc.peers_rwnd, un_sent,
13345             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13346             stcb->asoc.total_output_queue_size, error);
13347
13348 out:
13349 out_unlocked:
13350
13351         if (local_soresv && stcb) {
13352                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13353                 local_soresv = 0;
13354         }
13355         if (create_lock_applied) {
13356                 SCTP_ASOC_CREATE_UNLOCK(inp);
13357                 create_lock_applied = 0;
13358         }
13359         if ((stcb) && hold_tcblock) {
13360                 SCTP_TCB_UNLOCK(stcb);
13361         }
13362         if (stcb && free_cnt_applied) {
13363                 atomic_add_int(&stcb->asoc.refcnt, -1);
13364         }
13365 #ifdef INVARIANTS
13366         if (stcb) {
13367                 if (mtx_owned(&stcb->tcb_mtx)) {
13368                         panic("Leaving with tcb mtx owned?");
13369                 }
13370                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13371                         panic("Leaving with tcb send mtx owned?");
13372                 }
13373         }
13374 #endif
13375 #ifdef INVARIANTS
13376         if (inp) {
13377                 sctp_validate_no_locks(inp);
13378         } else {
13379                 printf("Warning - inp is NULL so cant validate locks\n");
13380         }
13381 #endif
13382         if (top) {
13383                 sctp_m_freem(top);
13384         }
13385         if (control) {
13386                 sctp_m_freem(control);
13387         }
13388         return (error);
13389 }
13390
13391
13392 /*
13393  * generate an AUTHentication chunk, if required
13394  */
13395 struct mbuf *
13396 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13397     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13398     struct sctp_tcb *stcb, uint8_t chunk)
13399 {
13400         struct mbuf *m_auth;
13401         struct sctp_auth_chunk *auth;
13402         int chunk_len;
13403
13404         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13405             (stcb == NULL))
13406                 return (m);
13407
13408         /* sysctl disabled auth? */
13409         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13410                 return (m);
13411
13412         /* peer doesn't do auth... */
13413         if (!stcb->asoc.peer_supports_auth) {
13414                 return (m);
13415         }
13416         /* does the requested chunk require auth? */
13417         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13418                 return (m);
13419         }
13420         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13421         if (m_auth == NULL) {
13422                 /* no mbuf's */
13423                 return (m);
13424         }
13425         /* reserve some space if this will be the first mbuf */
13426         if (m == NULL)
13427                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13428         /* fill in the AUTH chunk details */
13429         auth = mtod(m_auth, struct sctp_auth_chunk *);
13430         bzero(auth, sizeof(*auth));
13431         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13432         auth->ch.chunk_flags = 0;
13433         chunk_len = sizeof(*auth) +
13434             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13435         auth->ch.chunk_length = htons(chunk_len);
13436         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13437         /* key id and hmac digest will be computed and filled in upon send */
13438
13439         /* save the offset where the auth was inserted into the chain */
13440         if (m != NULL) {
13441                 struct mbuf *cn;
13442
13443                 *offset = 0;
13444                 cn = m;
13445                 while (cn) {
13446                         *offset += SCTP_BUF_LEN(cn);
13447                         cn = SCTP_BUF_NEXT(cn);
13448                 }
13449         } else
13450                 *offset = 0;
13451
13452         /* update length and return pointer to the auth chunk */
13453         SCTP_BUF_LEN(m_auth) = chunk_len;
13454         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13455         if (auth_ret != NULL)
13456                 *auth_ret = auth;
13457
13458         return (m);
13459 }
13460
13461 #ifdef INET6
13462 int
13463 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13464 {
13465         struct nd_prefix *pfx = NULL;
13466         struct nd_pfxrouter *pfxrtr = NULL;
13467         struct sockaddr_in6 gw6;
13468
13469         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13470                 return (0);
13471
13472         /* get prefix entry of address */
13473         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13474                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13475                         continue;
13476                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13477                     &src6->sin6_addr, &pfx->ndpr_mask))
13478                         break;
13479         }
13480         /* no prefix entry in the prefix list */
13481         if (pfx == NULL) {
13482                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13483                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13484                 return (0);
13485         }
13486         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13487         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13488
13489         /* search installed gateway from prefix entry */
13490         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13491             pfxrtr->pfr_next) {
13492                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13493                 gw6.sin6_family = AF_INET6;
13494                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13495                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13496                     sizeof(struct in6_addr));
13497                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13498                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13499                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13500                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13501                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13502                     ro->ro_rt->rt_gateway)) {
13503                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13504                         return (1);
13505                 }
13506         }
13507         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13508         return (0);
13509 }
13510
13511 #endif
13512
13513 int
13514 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13515 {
13516         struct sockaddr_in *sin, *mask;
13517         struct ifaddr *ifa;
13518         struct in_addr srcnetaddr, gwnetaddr;
13519
13520         if (ro == NULL || ro->ro_rt == NULL ||
13521             sifa->address.sa.sa_family != AF_INET) {
13522                 return (0);
13523         }
13524         ifa = (struct ifaddr *)sifa->ifa;
13525         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13526         sin = (struct sockaddr_in *)&sifa->address.sin;
13527         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13528         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13529         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13530         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13531
13532         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13533         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13534         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13535         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13536         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13537         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13538                 return (1);
13539         }
13540         return (0);
13541 }