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                         m->m_pkthdr.csum_flags = CSUM_SCTP;
4073                         m->m_pkthdr.csum_data = 0;
4074                         SCTP_STAT_INCR(sctps_sendhwcrc);
4075 #endif
4076                 }
4077                 /* send it out. table id is taken from stcb */
4078 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4079                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4080                         so = SCTP_INP_SO(inp);
4081                         SCTP_SOCKET_UNLOCK(so, 0);
4082                 }
4083 #endif
4084                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4085 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4086                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4087                         atomic_add_int(&stcb->asoc.refcnt, 1);
4088                         SCTP_TCB_UNLOCK(stcb);
4089                         SCTP_SOCKET_LOCK(so, 0);
4090                         SCTP_TCB_LOCK(stcb);
4091                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4092                 }
4093 #endif
4094                 if (net) {
4095                         /* for link local this must be done */
4096                         sin6->sin6_scope_id = prev_scope;
4097                         sin6->sin6_port = prev_port;
4098                 }
4099                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4100                 SCTP_STAT_INCR(sctps_sendpackets);
4101                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4102                 if (ret) {
4103                         SCTP_STAT_INCR(sctps_senderrors);
4104                 }
4105                 if (net == NULL) {
4106                         /* Now if we had a temp route free it */
4107                         if (ro->ro_rt) {
4108                                 RTFREE(ro->ro_rt);
4109                         }
4110                 } else {
4111                         /* PMTU check versus smallest asoc MTU goes here */
4112                         if (ro->ro_rt == NULL) {
4113                                 /* Route was freed */
4114                                 if (net->ro._s_addr &&
4115                                     net->src_addr_selected) {
4116                                         sctp_free_ifa(net->ro._s_addr);
4117                                         net->ro._s_addr = NULL;
4118                                 }
4119                                 net->src_addr_selected = 0;
4120                         }
4121                         if ((ro->ro_rt != NULL) &&
4122                             (net->ro._s_addr)) {
4123                                 uint32_t mtu;
4124
4125                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4126                                 if (mtu &&
4127                                     (stcb->asoc.smallest_mtu > mtu)) {
4128                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4129                                         net->mtu = mtu;
4130                                         if (net->port) {
4131                                                 net->mtu -= sizeof(struct udphdr);
4132                                         }
4133                                 }
4134                         } else if (ifp) {
4135                                 if (ND_IFINFO(ifp)->linkmtu &&
4136                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4137                                         sctp_mtu_size_reset(inp,
4138                                             &stcb->asoc,
4139                                             ND_IFINFO(ifp)->linkmtu);
4140                                 }
4141                         }
4142                 }
4143                 return (ret);
4144         }
4145 #endif
4146         else {
4147                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4148                     ((struct sockaddr *)to)->sa_family);
4149                 sctp_m_freem(m);
4150                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4151                 return (EFAULT);
4152         }
4153 }
4154
4155
4156 void
4157 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4158 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4159     SCTP_UNUSED
4160 #endif
4161 )
4162 {
4163         struct mbuf *m, *m_at, *mp_last;
4164         struct sctp_nets *net;
4165         struct sctp_init_chunk *init;
4166         struct sctp_supported_addr_param *sup_addr;
4167         struct sctp_adaptation_layer_indication *ali;
4168         struct sctp_ecn_supported_param *ecn;
4169         struct sctp_prsctp_supported_param *prsctp;
4170         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4171         struct sctp_supported_chunk_types_param *pr_supported;
4172         int cnt_inits_to = 0;
4173         int padval, ret;
4174         int num_ext;
4175         int p_len;
4176
4177         /* INIT's always go to the primary (and usually ONLY address) */
4178         mp_last = NULL;
4179         net = stcb->asoc.primary_destination;
4180         if (net == NULL) {
4181                 net = TAILQ_FIRST(&stcb->asoc.nets);
4182                 if (net == NULL) {
4183                         /* TSNH */
4184                         return;
4185                 }
4186                 /* we confirm any address we send an INIT to */
4187                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4188                 (void)sctp_set_primary_addr(stcb, NULL, net);
4189         } else {
4190                 /* we confirm any address we send an INIT to */
4191                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4192         }
4193         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4194 #ifdef INET6
4195         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4196                 /*
4197                  * special hook, if we are sending to link local it will not
4198                  * show up in our private address count.
4199                  */
4200                 struct sockaddr_in6 *sin6l;
4201
4202                 sin6l = &net->ro._l_addr.sin6;
4203                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4204                         cnt_inits_to = 1;
4205         }
4206 #endif
4207         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4208                 /* This case should not happen */
4209                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4210                 return;
4211         }
4212         /* start the INIT timer */
4213         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4214
4215         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4216         if (m == NULL) {
4217                 /* No memory, INIT timer will re-attempt. */
4218                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4219                 return;
4220         }
4221         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4222         /*
4223          * assume peer supports asconf in order to be able to queue local
4224          * address changes while an INIT is in flight and before the assoc
4225          * is established.
4226          */
4227         stcb->asoc.peer_supports_asconf = 1;
4228         /* Now lets put the SCTP header in place */
4229         init = mtod(m, struct sctp_init_chunk *);
4230         /* now the chunk header */
4231         init->ch.chunk_type = SCTP_INITIATION;
4232         init->ch.chunk_flags = 0;
4233         /* fill in later from mbuf we build */
4234         init->ch.chunk_length = 0;
4235         /* place in my tag */
4236         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4237         /* set up some of the credits. */
4238         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4239             SCTP_MINIMAL_RWND));
4240
4241         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4242         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4243         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4244         /* now the address restriction */
4245         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4246             sizeof(*init));
4247         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4248 #ifdef INET6
4249         /* we support 2 types: IPv6/IPv4 */
4250         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4251         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4252         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4253 #else
4254         /* we support 1 type: IPv4 */
4255         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4256         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4257         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4258 #endif
4259         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4260         /* adaptation layer indication parameter */
4261         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4262         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4263         ali->ph.param_length = htons(sizeof(*ali));
4264         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4265         SCTP_BUF_LEN(m) += sizeof(*ali);
4266         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4267
4268         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4269                 /* Add NAT friendly parameter */
4270                 struct sctp_paramhdr *ph;
4271
4272                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4273                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4274                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4275                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4276                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4277         }
4278         /* now any cookie time extensions */
4279         if (stcb->asoc.cookie_preserve_req) {
4280                 struct sctp_cookie_perserve_param *cookie_preserve;
4281
4282                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4283                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4284                 cookie_preserve->ph.param_length = htons(
4285                     sizeof(*cookie_preserve));
4286                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4287                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4288                 ecn = (struct sctp_ecn_supported_param *)(
4289                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4290                 stcb->asoc.cookie_preserve_req = 0;
4291         }
4292         /* ECN parameter */
4293         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4294                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4295                 ecn->ph.param_length = htons(sizeof(*ecn));
4296                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4297                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4298                     sizeof(*ecn));
4299         } else {
4300                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4301         }
4302         /* And now tell the peer we do pr-sctp */
4303         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4304         prsctp->ph.param_length = htons(sizeof(*prsctp));
4305         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4306
4307         /* And now tell the peer we do all the extensions */
4308         pr_supported = (struct sctp_supported_chunk_types_param *)
4309             ((caddr_t)prsctp + sizeof(*prsctp));
4310         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4311         num_ext = 0;
4312         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4313         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4314         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4315         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4316         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4317         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4318                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4319         }
4320         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4321                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4322         }
4323         p_len = sizeof(*pr_supported) + num_ext;
4324         pr_supported->ph.param_length = htons(p_len);
4325         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4326         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4327
4328
4329         /* ECN nonce: And now tell the peer we support ECN nonce */
4330         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4331                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4332                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4333                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4334                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4335                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4336         }
4337         /* add authentication parameters */
4338         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4339                 struct sctp_auth_random *randp;
4340                 struct sctp_auth_hmac_algo *hmacs;
4341                 struct sctp_auth_chunk_list *chunks;
4342
4343                 /* attach RANDOM parameter, if available */
4344                 if (stcb->asoc.authinfo.random != NULL) {
4345                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4346                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4347                         /* random key already contains the header */
4348                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4349                         /* zero out any padding required */
4350                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4351                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4352                 }
4353                 /* add HMAC_ALGO parameter */
4354                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4355                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4356                     (uint8_t *) hmacs->hmac_ids);
4357                 if (p_len > 0) {
4358                         p_len += sizeof(*hmacs);
4359                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4360                         hmacs->ph.param_length = htons(p_len);
4361                         /* zero out any padding required */
4362                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4363                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4364                 }
4365                 /* add CHUNKS parameter */
4366                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4367                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4368                     chunks->chunk_types);
4369                 if (p_len > 0) {
4370                         p_len += sizeof(*chunks);
4371                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4372                         chunks->ph.param_length = htons(p_len);
4373                         /* zero out any padding required */
4374                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4375                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4376                 }
4377         }
4378         m_at = m;
4379         /* now the addresses */
4380         {
4381                 struct sctp_scoping scp;
4382
4383                 /*
4384                  * To optimize this we could put the scoping stuff into a
4385                  * structure and remove the individual uint8's from the
4386                  * assoc structure. Then we could just sifa in the address
4387                  * within the stcb.. but for now this is a quick hack to get
4388                  * the address stuff teased apart.
4389                  */
4390                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4391                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4392                 scp.loopback_scope = stcb->asoc.loopback_scope;
4393                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4394                 scp.local_scope = stcb->asoc.local_scope;
4395                 scp.site_scope = stcb->asoc.site_scope;
4396
4397                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4398         }
4399
4400         /* calulate the size and update pkt header and chunk header */
4401         p_len = 0;
4402         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4403                 if (SCTP_BUF_NEXT(m_at) == NULL)
4404                         mp_last = m_at;
4405                 p_len += SCTP_BUF_LEN(m_at);
4406         }
4407         init->ch.chunk_length = htons(p_len);
4408         /*
4409          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4410          * here since the timer will drive a retranmission.
4411          */
4412
4413         /* I don't expect this to execute but we will be safe here */
4414         padval = p_len % 4;
4415         if ((padval) && (mp_last)) {
4416                 /*
4417                  * The compiler worries that mp_last may not be set even
4418                  * though I think it is impossible :-> however we add
4419                  * mp_last here just in case.
4420                  */
4421                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4422                 if (ret) {
4423                         /* Houston we have a problem, no space */
4424                         sctp_m_freem(m);
4425                         return;
4426                 }
4427                 p_len += padval;
4428         }
4429         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4430         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4431             (struct sockaddr *)&net->ro._l_addr,
4432             m, 0, NULL, 0, 0, 0, NULL, 0,
4433             inp->sctp_lport, stcb->rport, htonl(0),
4434             net->port, so_locked, NULL);
4435         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4436         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4437         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4438 }
4439
4440 struct mbuf *
4441 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4442     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4443 {
4444         /*
4445          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4446          * being equal to the beginning of the params i.e. (iphlen +
4447          * sizeof(struct sctp_init_msg) parse through the parameters to the
4448          * end of the mbuf verifying that all parameters are known.
4449          *
4450          * For unknown parameters build and return a mbuf with
4451          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4452          * processing this chunk stop, and set *abort_processing to 1.
4453          *
4454          * By having param_offset be pre-set to where parameters begin it is
4455          * hoped that this routine may be reused in the future by new
4456          * features.
4457          */
4458         struct sctp_paramhdr *phdr, params;
4459
4460         struct mbuf *mat, *op_err;
4461         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4462         int at, limit, pad_needed;
4463         uint16_t ptype, plen, padded_size;
4464         int err_at;
4465
4466         *abort_processing = 0;
4467         mat = in_initpkt;
4468         err_at = 0;
4469         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4470         at = param_offset;
4471         op_err = NULL;
4472         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4473         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4474         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4475                 ptype = ntohs(phdr->param_type);
4476                 plen = ntohs(phdr->param_length);
4477                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4478                         /* wacked parameter */
4479                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4480                         goto invalid_size;
4481                 }
4482                 limit -= SCTP_SIZE32(plen);
4483                 /*-
4484                  * All parameters for all chunks that we know/understand are
4485                  * listed here. We process them other places and make
4486                  * appropriate stop actions per the upper bits. However this
4487                  * is the generic routine processor's can call to get back
4488                  * an operr.. to either incorporate (init-ack) or send.
4489                  */
4490                 padded_size = SCTP_SIZE32(plen);
4491                 switch (ptype) {
4492                         /* Param's with variable size */
4493                 case SCTP_HEARTBEAT_INFO:
4494                 case SCTP_STATE_COOKIE:
4495                 case SCTP_UNRECOG_PARAM:
4496                 case SCTP_ERROR_CAUSE_IND:
4497                         /* ok skip fwd */
4498                         at += padded_size;
4499                         break;
4500                         /* Param's with variable size within a range */
4501                 case SCTP_CHUNK_LIST:
4502                 case SCTP_SUPPORTED_CHUNK_EXT:
4503                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4504                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4505                                 goto invalid_size;
4506                         }
4507                         at += padded_size;
4508                         break;
4509                 case SCTP_SUPPORTED_ADDRTYPE:
4510                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4511                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4512                                 goto invalid_size;
4513                         }
4514                         at += padded_size;
4515                         break;
4516                 case SCTP_RANDOM:
4517                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4518                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4519                                 goto invalid_size;
4520                         }
4521                         at += padded_size;
4522                         break;
4523                 case SCTP_SET_PRIM_ADDR:
4524                 case SCTP_DEL_IP_ADDRESS:
4525                 case SCTP_ADD_IP_ADDRESS:
4526                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4527                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4528                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4529                                 goto invalid_size;
4530                         }
4531                         at += padded_size;
4532                         break;
4533                         /* Param's with a fixed size */
4534                 case SCTP_IPV4_ADDRESS:
4535                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4536                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4537                                 goto invalid_size;
4538                         }
4539                         at += padded_size;
4540                         break;
4541                 case SCTP_IPV6_ADDRESS:
4542                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4543                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4544                                 goto invalid_size;
4545                         }
4546                         at += padded_size;
4547                         break;
4548                 case SCTP_COOKIE_PRESERVE:
4549                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4550                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4551                                 goto invalid_size;
4552                         }
4553                         at += padded_size;
4554                         break;
4555                 case SCTP_HAS_NAT_SUPPORT:
4556                         *nat_friendly = 1;
4557                         /* fall through */
4558                 case SCTP_ECN_NONCE_SUPPORTED:
4559                 case SCTP_PRSCTP_SUPPORTED:
4560
4561                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4562                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4563                                 goto invalid_size;
4564                         }
4565                         at += padded_size;
4566                         break;
4567                 case SCTP_ECN_CAPABLE:
4568                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4569                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4570                                 goto invalid_size;
4571                         }
4572                         at += padded_size;
4573                         break;
4574                 case SCTP_ULP_ADAPTATION:
4575                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4576                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4577                                 goto invalid_size;
4578                         }
4579                         at += padded_size;
4580                         break;
4581                 case SCTP_SUCCESS_REPORT:
4582                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4583                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4584                                 goto invalid_size;
4585                         }
4586                         at += padded_size;
4587                         break;
4588                 case SCTP_HOSTNAME_ADDRESS:
4589                         {
4590                                 /* We can NOT handle HOST NAME addresses!! */
4591                                 int l_len;
4592
4593                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4594                                 *abort_processing = 1;
4595                                 if (op_err == NULL) {
4596                                         /* Ok need to try to get a mbuf */
4597 #ifdef INET6
4598                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4599 #else
4600                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4601 #endif
4602                                         l_len += plen;
4603                                         l_len += sizeof(struct sctp_paramhdr);
4604                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4605                                         if (op_err) {
4606                                                 SCTP_BUF_LEN(op_err) = 0;
4607                                                 /*
4608                                                  * pre-reserve space for ip
4609                                                  * and sctp header  and
4610                                                  * chunk hdr
4611                                                  */
4612 #ifdef INET6
4613                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4614 #else
4615                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4616 #endif
4617                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4618                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4619                                         }
4620                                 }
4621                                 if (op_err) {
4622                                         /* If we have space */
4623                                         struct sctp_paramhdr s;
4624
4625                                         if (err_at % 4) {
4626                                                 uint32_t cpthis = 0;
4627
4628                                                 pad_needed = 4 - (err_at % 4);
4629                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4630                                                 err_at += pad_needed;
4631                                         }
4632                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4633                                         s.param_length = htons(sizeof(s) + plen);
4634                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4635                                         err_at += sizeof(s);
4636                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4637                                         if (phdr == NULL) {
4638                                                 sctp_m_freem(op_err);
4639                                                 /*
4640                                                  * we are out of memory but
4641                                                  * we still need to have a
4642                                                  * look at what to do (the
4643                                                  * system is in trouble
4644                                                  * though).
4645                                                  */
4646                                                 return (NULL);
4647                                         }
4648                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4649                                         err_at += plen;
4650                                 }
4651                                 return (op_err);
4652                                 break;
4653                         }
4654                 default:
4655                         /*
4656                          * we do not recognize the parameter figure out what
4657                          * we do.
4658                          */
4659                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4660                         if ((ptype & 0x4000) == 0x4000) {
4661                                 /* Report bit is set?? */
4662                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4663                                 if (op_err == NULL) {
4664                                         int l_len;
4665
4666                                         /* Ok need to try to get an mbuf */
4667 #ifdef INET6
4668                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4669 #else
4670                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4671 #endif
4672                                         l_len += plen;
4673                                         l_len += sizeof(struct sctp_paramhdr);
4674                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4675                                         if (op_err) {
4676                                                 SCTP_BUF_LEN(op_err) = 0;
4677 #ifdef INET6
4678                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4679 #else
4680                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4681 #endif
4682                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4683                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4684                                         }
4685                                 }
4686                                 if (op_err) {
4687                                         /* If we have space */
4688                                         struct sctp_paramhdr s;
4689
4690                                         if (err_at % 4) {
4691                                                 uint32_t cpthis = 0;
4692
4693                                                 pad_needed = 4 - (err_at % 4);
4694                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4695                                                 err_at += pad_needed;
4696                                         }
4697                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4698                                         s.param_length = htons(sizeof(s) + plen);
4699                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4700                                         err_at += sizeof(s);
4701                                         if (plen > sizeof(tempbuf)) {
4702                                                 plen = sizeof(tempbuf);
4703                                         }
4704                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4705                                         if (phdr == NULL) {
4706                                                 sctp_m_freem(op_err);
4707                                                 /*
4708                                                  * we are out of memory but
4709                                                  * we still need to have a
4710                                                  * look at what to do (the
4711                                                  * system is in trouble
4712                                                  * though).
4713                                                  */
4714                                                 op_err = NULL;
4715                                                 goto more_processing;
4716                                         }
4717                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4718                                         err_at += plen;
4719                                 }
4720                         }
4721         more_processing:
4722                         if ((ptype & 0x8000) == 0x0000) {
4723                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4724                                 return (op_err);
4725                         } else {
4726                                 /* skip this chunk and continue processing */
4727                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4728                                 at += SCTP_SIZE32(plen);
4729                         }
4730                         break;
4731
4732                 }
4733                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4734         }
4735         return (op_err);
4736 invalid_size:
4737         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4738         *abort_processing = 1;
4739         if ((op_err == NULL) && phdr) {
4740                 int l_len;
4741
4742 #ifdef INET6
4743                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4744 #else
4745                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4746 #endif
4747                 l_len += (2 * sizeof(struct sctp_paramhdr));
4748                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4749                 if (op_err) {
4750                         SCTP_BUF_LEN(op_err) = 0;
4751 #ifdef INET6
4752                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4753 #else
4754                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4755 #endif
4756                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4757                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4758                 }
4759         }
4760         if ((op_err) && phdr) {
4761                 struct sctp_paramhdr s;
4762
4763                 if (err_at % 4) {
4764                         uint32_t cpthis = 0;
4765
4766                         pad_needed = 4 - (err_at % 4);
4767                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4768                         err_at += pad_needed;
4769                 }
4770                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4771                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4772                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4773                 err_at += sizeof(s);
4774                 /* Only copy back the p-hdr that caused the issue */
4775                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4776         }
4777         return (op_err);
4778 }
4779
4780 static int
4781 sctp_are_there_new_addresses(struct sctp_association *asoc,
4782     struct mbuf *in_initpkt, int iphlen, int offset)
4783 {
4784         /*
4785          * Given a INIT packet, look through the packet to verify that there
4786          * are NO new addresses. As we go through the parameters add reports
4787          * of any un-understood parameters that require an error.  Also we
4788          * must return (1) to drop the packet if we see a un-understood
4789          * parameter that tells us to drop the chunk.
4790          */
4791         struct sockaddr_in sin4, *sa4;
4792
4793 #ifdef INET6
4794         struct sockaddr_in6 sin6, *sa6;
4795
4796 #endif
4797         struct sockaddr *sa_touse;
4798         struct sockaddr *sa;
4799         struct sctp_paramhdr *phdr, params;
4800         struct ip *iph;
4801
4802 #ifdef INET6
4803         struct ip6_hdr *ip6h;
4804
4805 #endif
4806         struct mbuf *mat;
4807         uint16_t ptype, plen;
4808         int err_at;
4809         uint8_t fnd;
4810         struct sctp_nets *net;
4811
4812         memset(&sin4, 0, sizeof(sin4));
4813 #ifdef INET6
4814         memset(&sin6, 0, sizeof(sin6));
4815 #endif
4816         sin4.sin_family = AF_INET;
4817         sin4.sin_len = sizeof(sin4);
4818 #ifdef INET6
4819         sin6.sin6_family = AF_INET6;
4820         sin6.sin6_len = sizeof(sin6);
4821 #endif
4822         sa_touse = NULL;
4823         /* First what about the src address of the pkt ? */
4824         iph = mtod(in_initpkt, struct ip *);
4825         switch (iph->ip_v) {
4826         case IPVERSION:
4827                 /* source addr is IPv4 */
4828                 sin4.sin_addr = iph->ip_src;
4829                 sa_touse = (struct sockaddr *)&sin4;
4830                 break;
4831 #ifdef INET6
4832         case IPV6_VERSION >> 4:
4833                 /* source addr is IPv6 */
4834                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4835                 sin6.sin6_addr = ip6h->ip6_src;
4836                 sa_touse = (struct sockaddr *)&sin6;
4837                 break;
4838 #endif
4839         default:
4840                 return (1);
4841         }
4842
4843         fnd = 0;
4844         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4845                 sa = (struct sockaddr *)&net->ro._l_addr;
4846                 if (sa->sa_family == sa_touse->sa_family) {
4847                         if (sa->sa_family == AF_INET) {
4848                                 sa4 = (struct sockaddr_in *)sa;
4849                                 if (sa4->sin_addr.s_addr ==
4850                                     sin4.sin_addr.s_addr) {
4851                                         fnd = 1;
4852                                         break;
4853                                 }
4854                         }
4855 #ifdef INET6
4856                         if (sa->sa_family == AF_INET6) {
4857                                 sa6 = (struct sockaddr_in6 *)sa;
4858                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4859                                     &sin6)) {
4860                                         fnd = 1;
4861                                         break;
4862                                 }
4863                         }
4864 #endif
4865                 }
4866         }
4867         if (fnd == 0) {
4868                 /* New address added! no need to look futher. */
4869                 return (1);
4870         }
4871         /* Ok so far lets munge through the rest of the packet */
4872         mat = in_initpkt;
4873         err_at = 0;
4874         sa_touse = NULL;
4875         offset += sizeof(struct sctp_init_chunk);
4876         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4877         while (phdr) {
4878                 ptype = ntohs(phdr->param_type);
4879                 plen = ntohs(phdr->param_length);
4880                 if (ptype == SCTP_IPV4_ADDRESS) {
4881                         struct sctp_ipv4addr_param *p4, p4_buf;
4882
4883                         phdr = sctp_get_next_param(mat, offset,
4884                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4885                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4886                             phdr == NULL) {
4887                                 return (1);
4888                         }
4889                         p4 = (struct sctp_ipv4addr_param *)phdr;
4890                         sin4.sin_addr.s_addr = p4->addr;
4891                         sa_touse = (struct sockaddr *)&sin4;
4892                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4893                         struct sctp_ipv6addr_param *p6, p6_buf;
4894
4895                         phdr = sctp_get_next_param(mat, offset,
4896                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4897                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4898                             phdr == NULL) {
4899                                 return (1);
4900                         }
4901                         p6 = (struct sctp_ipv6addr_param *)phdr;
4902 #ifdef INET6
4903                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4904                             sizeof(p6->addr));
4905 #endif
4906                         sa_touse = (struct sockaddr *)&sin4;
4907                 }
4908                 if (sa_touse) {
4909                         /* ok, sa_touse points to one to check */
4910                         fnd = 0;
4911                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4912                                 sa = (struct sockaddr *)&net->ro._l_addr;
4913                                 if (sa->sa_family != sa_touse->sa_family) {
4914                                         continue;
4915                                 }
4916                                 if (sa->sa_family == AF_INET) {
4917                                         sa4 = (struct sockaddr_in *)sa;
4918                                         if (sa4->sin_addr.s_addr ==
4919                                             sin4.sin_addr.s_addr) {
4920                                                 fnd = 1;
4921                                                 break;
4922                                         }
4923                                 }
4924 #ifdef INET6
4925                                 if (sa->sa_family == AF_INET6) {
4926                                         sa6 = (struct sockaddr_in6 *)sa;
4927                                         if (SCTP6_ARE_ADDR_EQUAL(
4928                                             sa6, &sin6)) {
4929                                                 fnd = 1;
4930                                                 break;
4931                                         }
4932                                 }
4933 #endif
4934                         }
4935                         if (!fnd) {
4936                                 /* New addr added! no need to look further */
4937                                 return (1);
4938                         }
4939                 }
4940                 offset += SCTP_SIZE32(plen);
4941                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4942         }
4943         return (0);
4944 }
4945
4946 /*
4947  * Given a MBUF chain that was sent into us containing an INIT. Build a
4948  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4949  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4950  * message (i.e. the struct sctp_init_msg).
4951  */
4952 void
4953 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4954     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4955     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4956 {
4957         struct sctp_association *asoc;
4958         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4959         struct sctp_init_ack_chunk *initack;
4960         struct sctp_adaptation_layer_indication *ali;
4961         struct sctp_ecn_supported_param *ecn;
4962         struct sctp_prsctp_supported_param *prsctp;
4963         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4964         struct sctp_supported_chunk_types_param *pr_supported;
4965         union sctp_sockstore store, store1, *over_addr;
4966         struct sockaddr_in *sin, *to_sin;
4967
4968 #ifdef INET6
4969         struct sockaddr_in6 *sin6, *to_sin6;
4970
4971 #endif
4972         struct ip *iph;
4973
4974 #ifdef INET6
4975         struct ip6_hdr *ip6;
4976
4977 #endif
4978         struct sockaddr *to;
4979         struct sctp_state_cookie stc;
4980         struct sctp_nets *net = NULL;
4981         uint8_t *signature = NULL;
4982         int cnt_inits_to = 0;
4983         uint16_t his_limit, i_want;
4984         int abort_flag, padval;
4985         int num_ext;
4986         int p_len;
4987         int nat_friendly = 0;
4988         struct socket *so;
4989
4990         if (stcb)
4991                 asoc = &stcb->asoc;
4992         else
4993                 asoc = NULL;
4994         mp_last = NULL;
4995         if ((asoc != NULL) &&
4996             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4997             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4998                 /* new addresses, out of here in non-cookie-wait states */
4999                 /*
5000                  * Send a ABORT, we don't add the new address error clause
5001                  * though we even set the T bit and copy in the 0 tag.. this
5002                  * looks no different than if no listener was present.
5003                  */
5004                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5005                 return;
5006         }
5007         abort_flag = 0;
5008         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5009             (offset + sizeof(struct sctp_init_chunk)),
5010             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5011         if (abort_flag) {
5012 do_a_abort:
5013                 sctp_send_abort(init_pkt, iphlen, sh,
5014                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5015                 return;
5016         }
5017         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5018         if (m == NULL) {
5019                 /* No memory, INIT timer will re-attempt. */
5020                 if (op_err)
5021                         sctp_m_freem(op_err);
5022                 return;
5023         }
5024         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5025
5026         /* the time I built cookie */
5027         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5028
5029         /* populate any tie tags */
5030         if (asoc != NULL) {
5031                 /* unlock before tag selections */
5032                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5033                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5034                 stc.cookie_life = asoc->cookie_life;
5035                 net = asoc->primary_destination;
5036         } else {
5037                 stc.tie_tag_my_vtag = 0;
5038                 stc.tie_tag_peer_vtag = 0;
5039                 /* life I will award this cookie */
5040                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5041         }
5042
5043         /* copy in the ports for later check */
5044         stc.myport = sh->dest_port;
5045         stc.peerport = sh->src_port;
5046
5047         /*
5048          * If we wanted to honor cookie life extentions, we would add to
5049          * stc.cookie_life. For now we should NOT honor any extension
5050          */
5051         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5052         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5053                 struct inpcb *in_inp;
5054
5055                 /* Its a V6 socket */
5056                 in_inp = (struct inpcb *)inp;
5057                 stc.ipv6_addr_legal = 1;
5058                 /* Now look at the binding flag to see if V4 will be legal */
5059                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5060                         stc.ipv4_addr_legal = 1;
5061                 } else {
5062                         /* V4 addresses are NOT legal on the association */
5063                         stc.ipv4_addr_legal = 0;
5064                 }
5065         } else {
5066                 /* Its a V4 socket, no - V6 */
5067                 stc.ipv4_addr_legal = 1;
5068                 stc.ipv6_addr_legal = 0;
5069         }
5070
5071 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5072         stc.ipv4_scope = 1;
5073 #else
5074         stc.ipv4_scope = 0;
5075 #endif
5076         /* now for scope setup */
5077         memset((caddr_t)&store, 0, sizeof(store));
5078         memset((caddr_t)&store1, 0, sizeof(store1));
5079         sin = &store.sin;
5080         to_sin = &store1.sin;
5081 #ifdef INET6
5082         sin6 = &store.sin6;
5083         to_sin6 = &store1.sin6;
5084 #endif
5085         iph = mtod(init_pkt, struct ip *);
5086         /* establish the to_addr's */
5087         switch (iph->ip_v) {
5088         case IPVERSION:
5089                 to_sin->sin_port = sh->dest_port;
5090                 to_sin->sin_family = AF_INET;
5091                 to_sin->sin_len = sizeof(struct sockaddr_in);
5092                 to_sin->sin_addr = iph->ip_dst;
5093                 break;
5094 #ifdef INET6
5095         case IPV6_VERSION >> 4:
5096                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5097                 to_sin6->sin6_addr = ip6->ip6_dst;
5098                 to_sin6->sin6_scope_id = 0;
5099                 to_sin6->sin6_port = sh->dest_port;
5100                 to_sin6->sin6_family = AF_INET6;
5101                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5102                 break;
5103 #endif
5104         default:
5105                 goto do_a_abort;
5106                 break;
5107         };
5108
5109         if (net == NULL) {
5110                 to = (struct sockaddr *)&store;
5111                 switch (iph->ip_v) {
5112                 case IPVERSION:
5113                         {
5114                                 sin->sin_family = AF_INET;
5115                                 sin->sin_len = sizeof(struct sockaddr_in);
5116                                 sin->sin_port = sh->src_port;
5117                                 sin->sin_addr = iph->ip_src;
5118                                 /* lookup address */
5119                                 stc.address[0] = sin->sin_addr.s_addr;
5120                                 stc.address[1] = 0;
5121                                 stc.address[2] = 0;
5122                                 stc.address[3] = 0;
5123                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5124                                 /* local from address */
5125                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5126                                 stc.laddress[1] = 0;
5127                                 stc.laddress[2] = 0;
5128                                 stc.laddress[3] = 0;
5129                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5130                                 /* scope_id is only for v6 */
5131                                 stc.scope_id = 0;
5132 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5133                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5134                                         stc.ipv4_scope = 1;
5135                                 }
5136 #else
5137                                 stc.ipv4_scope = 1;
5138 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5139                                 /* Must use the address in this case */
5140                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5141                                         stc.loopback_scope = 1;
5142                                         stc.ipv4_scope = 1;
5143                                         stc.site_scope = 1;
5144                                         stc.local_scope = 0;
5145                                 }
5146                                 break;
5147                         }
5148 #ifdef INET6
5149                 case IPV6_VERSION >> 4:
5150                         {
5151                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5152                                 sin6->sin6_family = AF_INET6;
5153                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5154                                 sin6->sin6_port = sh->src_port;
5155                                 sin6->sin6_addr = ip6->ip6_src;
5156                                 /* lookup address */
5157                                 memcpy(&stc.address, &sin6->sin6_addr,
5158                                     sizeof(struct in6_addr));
5159                                 sin6->sin6_scope_id = 0;
5160                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5161                                 stc.scope_id = 0;
5162                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5163                                         /*
5164                                          * FIX ME: does this have scope from
5165                                          * rcvif?
5166                                          */
5167                                         (void)sa6_recoverscope(sin6);
5168                                         stc.scope_id = sin6->sin6_scope_id;
5169                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5170                                         stc.loopback_scope = 1;
5171                                         stc.local_scope = 0;
5172                                         stc.site_scope = 1;
5173                                         stc.ipv4_scope = 1;
5174                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5175                                         /*
5176                                          * If the new destination is a
5177                                          * LINK_LOCAL we must have common
5178                                          * both site and local scope. Don't
5179                                          * set local scope though since we
5180                                          * must depend on the source to be
5181                                          * added implicitly. We cannot
5182                                          * assure just because we share one
5183                                          * link that all links are common.
5184                                          */
5185                                         stc.local_scope = 0;
5186                                         stc.site_scope = 1;
5187                                         stc.ipv4_scope = 1;
5188                                         /*
5189                                          * we start counting for the private
5190                                          * address stuff at 1. since the
5191                                          * link local we source from won't
5192                                          * show up in our scoped count.
5193                                          */
5194                                         cnt_inits_to = 1;
5195                                         /*
5196                                          * pull out the scope_id from
5197                                          * incoming pkt
5198                                          */
5199                                         /*
5200                                          * FIX ME: does this have scope from
5201                                          * rcvif?
5202                                          */
5203                                         (void)sa6_recoverscope(sin6);
5204                                         stc.scope_id = sin6->sin6_scope_id;
5205                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5206                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5207                                         /*
5208                                          * If the new destination is
5209                                          * SITE_LOCAL then we must have site
5210                                          * scope in common.
5211                                          */
5212                                         stc.site_scope = 1;
5213                                 }
5214                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5215                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5216                                 break;
5217                         }
5218 #endif
5219                 default:
5220                         /* TSNH */
5221                         goto do_a_abort;
5222                         break;
5223                 }
5224         } else {
5225                 /* set the scope per the existing tcb */
5226
5227 #ifdef INET6
5228                 struct sctp_nets *lnet;
5229
5230 #endif
5231
5232                 stc.loopback_scope = asoc->loopback_scope;
5233                 stc.ipv4_scope = asoc->ipv4_local_scope;
5234                 stc.site_scope = asoc->site_scope;
5235                 stc.local_scope = asoc->local_scope;
5236 #ifdef INET6
5237                 /* Why do we not consider IPv4 LL addresses? */
5238                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5239                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5240                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5241                                         /*
5242                                          * if we have a LL address, start
5243                                          * counting at 1.
5244                                          */
5245                                         cnt_inits_to = 1;
5246                                 }
5247                         }
5248                 }
5249 #endif
5250                 /* use the net pointer */
5251                 to = (struct sockaddr *)&net->ro._l_addr;
5252                 switch (to->sa_family) {
5253                 case AF_INET:
5254                         sin = (struct sockaddr_in *)to;
5255                         stc.address[0] = sin->sin_addr.s_addr;
5256                         stc.address[1] = 0;
5257                         stc.address[2] = 0;
5258                         stc.address[3] = 0;
5259                         stc.addr_type = SCTP_IPV4_ADDRESS;
5260                         if (net->src_addr_selected == 0) {
5261                                 /*
5262                                  * strange case here, the INIT should have
5263                                  * did the selection.
5264                                  */
5265                                 net->ro._s_addr = sctp_source_address_selection(inp,
5266                                     stcb, (sctp_route_t *) & net->ro,
5267                                     net, 0, vrf_id);
5268                                 if (net->ro._s_addr == NULL)
5269                                         return;
5270
5271                                 net->src_addr_selected = 1;
5272
5273                         }
5274                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5275                         stc.laddress[1] = 0;
5276                         stc.laddress[2] = 0;
5277                         stc.laddress[3] = 0;
5278                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5279                         break;
5280 #ifdef INET6
5281                 case AF_INET6:
5282                         sin6 = (struct sockaddr_in6 *)to;
5283                         memcpy(&stc.address, &sin6->sin6_addr,
5284                             sizeof(struct in6_addr));
5285                         stc.addr_type = SCTP_IPV6_ADDRESS;
5286                         if (net->src_addr_selected == 0) {
5287                                 /*
5288                                  * strange case here, the INIT should have
5289                                  * did the selection.
5290                                  */
5291                                 net->ro._s_addr = sctp_source_address_selection(inp,
5292                                     stcb, (sctp_route_t *) & net->ro,
5293                                     net, 0, vrf_id);
5294                                 if (net->ro._s_addr == NULL)
5295                                         return;
5296
5297                                 net->src_addr_selected = 1;
5298                         }
5299                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5300                             sizeof(struct in6_addr));
5301                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5302                         break;
5303 #endif
5304                 }
5305         }
5306         /* Now lets put the SCTP header in place */
5307         initack = mtod(m, struct sctp_init_ack_chunk *);
5308         /* Save it off for quick ref */
5309         stc.peers_vtag = init_chk->init.initiate_tag;
5310         /* who are we */
5311         memcpy(stc.identification, SCTP_VERSION_STRING,
5312             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5313         /* now the chunk header */
5314         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5315         initack->ch.chunk_flags = 0;
5316         /* fill in later from mbuf we build */
5317         initack->ch.chunk_length = 0;
5318         /* place in my tag */
5319         if ((asoc != NULL) &&
5320             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5321             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5322             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5323                 /* re-use the v-tags and init-seq here */
5324                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5325                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5326         } else {
5327                 uint32_t vtag, itsn;
5328
5329                 if (hold_inp_lock) {
5330                         SCTP_INP_INCR_REF(inp);
5331                         SCTP_INP_RUNLOCK(inp);
5332                 }
5333                 if (asoc) {
5334                         atomic_add_int(&asoc->refcnt, 1);
5335                         SCTP_TCB_UNLOCK(stcb);
5336         new_tag:
5337                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5338                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5339                                 /*
5340                                  * Got a duplicate vtag on some guy behind a
5341                                  * nat make sure we don't use it.
5342                                  */
5343                                 goto new_tag;
5344                         }
5345                         initack->init.initiate_tag = htonl(vtag);
5346                         /* get a TSN to use too */
5347                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5348                         initack->init.initial_tsn = htonl(itsn);
5349                         SCTP_TCB_LOCK(stcb);
5350                         atomic_add_int(&asoc->refcnt, -1);
5351                 } else {
5352                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5353                         initack->init.initiate_tag = htonl(vtag);
5354                         /* get a TSN to use too */
5355                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5356                 }
5357                 if (hold_inp_lock) {
5358                         SCTP_INP_RLOCK(inp);
5359                         SCTP_INP_DECR_REF(inp);
5360                 }
5361         }
5362         /* save away my tag to */
5363         stc.my_vtag = initack->init.initiate_tag;
5364
5365         /* set up some of the credits. */
5366         so = inp->sctp_socket;
5367         if (so == NULL) {
5368                 /* memory problem */
5369                 sctp_m_freem(m);
5370                 return;
5371         } else {
5372                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5373         }
5374         /* set what I want */
5375         his_limit = ntohs(init_chk->init.num_inbound_streams);
5376         /* choose what I want */
5377         if (asoc != NULL) {
5378                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5379                         i_want = asoc->streamoutcnt;
5380                 } else {
5381                         i_want = inp->sctp_ep.pre_open_stream_count;
5382                 }
5383         } else {
5384                 i_want = inp->sctp_ep.pre_open_stream_count;
5385         }
5386         if (his_limit < i_want) {
5387                 /* I Want more :< */
5388                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5389         } else {
5390                 /* I can have what I want :> */
5391                 initack->init.num_outbound_streams = htons(i_want);
5392         }
5393         /* tell him his limt. */
5394         initack->init.num_inbound_streams =
5395             htons(inp->sctp_ep.max_open_streams_intome);
5396
5397         /* adaptation layer indication parameter */
5398         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5399         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5400         ali->ph.param_length = htons(sizeof(*ali));
5401         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5402         SCTP_BUF_LEN(m) += sizeof(*ali);
5403         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5404
5405         /* ECN parameter */
5406         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5407                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5408                 ecn->ph.param_length = htons(sizeof(*ecn));
5409                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5410
5411                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5412                     sizeof(*ecn));
5413         } else {
5414                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5415         }
5416         /* And now tell the peer we do  pr-sctp */
5417         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5418         prsctp->ph.param_length = htons(sizeof(*prsctp));
5419         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5420         if (nat_friendly) {
5421                 /* Add NAT friendly parameter */
5422                 struct sctp_paramhdr *ph;
5423
5424                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5425                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5426                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5427                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5428         }
5429         /* And now tell the peer we do all the extensions */
5430         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5431         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5432         num_ext = 0;
5433         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5434         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5435         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5436         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5437         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5438         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5439                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5440         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5441                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5442         p_len = sizeof(*pr_supported) + num_ext;
5443         pr_supported->ph.param_length = htons(p_len);
5444         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5445         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5446
5447         /* ECN nonce: And now tell the peer we support ECN nonce */
5448         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5449                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5450                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5451                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5452                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5453                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5454         }
5455         /* add authentication parameters */
5456         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5457                 struct sctp_auth_random *randp;
5458                 struct sctp_auth_hmac_algo *hmacs;
5459                 struct sctp_auth_chunk_list *chunks;
5460                 uint16_t random_len;
5461
5462                 /* generate and add RANDOM parameter */
5463                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5464                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5465                 randp->ph.param_type = htons(SCTP_RANDOM);
5466                 p_len = sizeof(*randp) + random_len;
5467                 randp->ph.param_length = htons(p_len);
5468                 SCTP_READ_RANDOM(randp->random_data, random_len);
5469                 /* zero out any padding required */
5470                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5471                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5472
5473                 /* add HMAC_ALGO parameter */
5474                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5475                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5476                     (uint8_t *) hmacs->hmac_ids);
5477                 if (p_len > 0) {
5478                         p_len += sizeof(*hmacs);
5479                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5480                         hmacs->ph.param_length = htons(p_len);
5481                         /* zero out any padding required */
5482                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5483                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5484                 }
5485                 /* add CHUNKS parameter */
5486                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5487                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5488                     chunks->chunk_types);
5489                 if (p_len > 0) {
5490                         p_len += sizeof(*chunks);
5491                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5492                         chunks->ph.param_length = htons(p_len);
5493                         /* zero out any padding required */
5494                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5495                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5496                 }
5497         }
5498         m_at = m;
5499         /* now the addresses */
5500         {
5501                 struct sctp_scoping scp;
5502
5503                 /*
5504                  * To optimize this we could put the scoping stuff into a
5505                  * structure and remove the individual uint8's from the stc
5506                  * structure. Then we could just sifa in the address within
5507                  * the stc.. but for now this is a quick hack to get the
5508                  * address stuff teased apart.
5509                  */
5510                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5511                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5512                 scp.loopback_scope = stc.loopback_scope;
5513                 scp.ipv4_local_scope = stc.ipv4_scope;
5514                 scp.local_scope = stc.local_scope;
5515                 scp.site_scope = stc.site_scope;
5516                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5517         }
5518
5519         /* tack on the operational error if present */
5520         if (op_err) {
5521                 struct mbuf *ol;
5522                 int llen;
5523
5524                 llen = 0;
5525                 ol = op_err;
5526                 while (ol) {
5527                         llen += SCTP_BUF_LEN(ol);
5528                         ol = SCTP_BUF_NEXT(ol);
5529                 }
5530                 if (llen % 4) {
5531                         /* must add a pad to the param */
5532                         uint32_t cpthis = 0;
5533                         int padlen;
5534
5535                         padlen = 4 - (llen % 4);
5536                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5537                 }
5538                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5539                         m_at = SCTP_BUF_NEXT(m_at);
5540                 }
5541                 SCTP_BUF_NEXT(m_at) = op_err;
5542                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5543                         m_at = SCTP_BUF_NEXT(m_at);
5544                 }
5545         }
5546         /* pre-calulate the size and update pkt header and chunk header */
5547         p_len = 0;
5548         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5549                 p_len += SCTP_BUF_LEN(m_tmp);
5550                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5551                         /* m_tmp should now point to last one */
5552                         break;
5553                 }
5554         }
5555
5556         /* Now we must build a cookie */
5557         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5558         if (m_cookie == NULL) {
5559                 /* memory problem */
5560                 sctp_m_freem(m);
5561                 return;
5562         }
5563         /* Now append the cookie to the end and update the space/size */
5564         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5565
5566         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5567                 p_len += SCTP_BUF_LEN(m_tmp);
5568                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5569                         /* m_tmp should now point to last one */
5570                         mp_last = m_tmp;
5571                         break;
5572                 }
5573         }
5574         /*
5575          * Place in the size, but we don't include the last pad (if any) in
5576          * the INIT-ACK.
5577          */
5578         initack->ch.chunk_length = htons(p_len);
5579
5580         /*
5581          * Time to sign the cookie, we don't sign over the cookie signature
5582          * though thus we set trailer.
5583          */
5584         (void)sctp_hmac_m(SCTP_HMAC,
5585             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5586             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5587             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5588         /*
5589          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5590          * here since the timer will drive a retranmission.
5591          */
5592         padval = p_len % 4;
5593         if ((padval) && (mp_last)) {
5594                 /* see my previous comments on mp_last */
5595                 int ret;
5596
5597                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5598                 if (ret) {
5599                         /* Houston we have a problem, no space */
5600                         sctp_m_freem(m);
5601                         return;
5602                 }
5603                 p_len += padval;
5604         }
5605         if (stc.loopback_scope) {
5606                 over_addr = &store1;
5607         } else {
5608                 over_addr = NULL;
5609         }
5610
5611         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5612             0, NULL, 0,
5613             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5614             port, SCTP_SO_NOT_LOCKED, over_addr);
5615         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5616 }
5617
5618
5619 void
5620 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5621     struct sctp_association *asoc,
5622     struct sctp_stream_out *strq, int holds_lock)
5623 {
5624         if (holds_lock == 0) {
5625                 SCTP_TCB_SEND_LOCK(stcb);
5626         }
5627         if ((strq->next_spoke.tqe_next == NULL) &&
5628             (strq->next_spoke.tqe_prev == NULL)) {
5629                 TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5630         }
5631         if (holds_lock == 0) {
5632                 SCTP_TCB_SEND_UNLOCK(stcb);
5633         }
5634 }
5635
5636 void
5637 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5638     struct sctp_association *asoc,
5639     struct sctp_stream_out *strq,
5640     int holds_lock)
5641 {
5642         /* take off and then setup so we know it is not on the wheel */
5643         if (holds_lock == 0) {
5644                 SCTP_TCB_SEND_LOCK(stcb);
5645         }
5646         if (TAILQ_EMPTY(&strq->outqueue)) {
5647                 if (asoc->last_out_stream == strq) {
5648                         asoc->last_out_stream = TAILQ_PREV(asoc->last_out_stream, sctpwheel_listhead, next_spoke);
5649                         if (asoc->last_out_stream == NULL) {
5650                                 asoc->last_out_stream = TAILQ_LAST(&asoc->out_wheel, sctpwheel_listhead);
5651                         }
5652                         if (asoc->last_out_stream == strq) {
5653                                 asoc->last_out_stream = NULL;
5654                         }
5655                 }
5656                 TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5657                 strq->next_spoke.tqe_next = NULL;
5658                 strq->next_spoke.tqe_prev = NULL;
5659         }
5660         if (holds_lock == 0) {
5661                 SCTP_TCB_SEND_UNLOCK(stcb);
5662         }
5663 }
5664
5665 static void
5666 sctp_prune_prsctp(struct sctp_tcb *stcb,
5667     struct sctp_association *asoc,
5668     struct sctp_sndrcvinfo *srcv,
5669     int dataout)
5670 {
5671         int freed_spc = 0;
5672         struct sctp_tmit_chunk *chk, *nchk;
5673
5674         SCTP_TCB_LOCK_ASSERT(stcb);
5675         if ((asoc->peer_supports_prsctp) &&
5676             (asoc->sent_queue_cnt_removeable > 0)) {
5677                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5678                         /*
5679                          * Look for chunks marked with the PR_SCTP flag AND
5680                          * the buffer space flag. If the one being sent is
5681                          * equal or greater priority then purge the old one
5682                          * and free some space.
5683                          */
5684                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5685                                 /*
5686                                  * This one is PR-SCTP AND buffer space
5687                                  * limited type
5688                                  */
5689                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5690                                         /*
5691                                          * Lower numbers equates to higher
5692                                          * priority so if the one we are
5693                                          * looking at has a larger or equal
5694                                          * priority we want to drop the data
5695                                          * and NOT retransmit it.
5696                                          */
5697                                         if (chk->data) {
5698                                                 /*
5699                                                  * We release the book_size
5700                                                  * if the mbuf is here
5701                                                  */
5702                                                 int ret_spc;
5703                                                 int cause;
5704
5705                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5706                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5707                                                 else
5708                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5709                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5710                                                     cause,
5711                                                     SCTP_SO_LOCKED);
5712                                                 freed_spc += ret_spc;
5713                                                 if (freed_spc >= dataout) {
5714                                                         return;
5715                                                 }
5716                                         }       /* if chunk was present */
5717                                 }       /* if of sufficent priority */
5718                         }       /* if chunk has enabled */
5719                 }               /* tailqforeach */
5720
5721                 chk = TAILQ_FIRST(&asoc->send_queue);
5722                 while (chk) {
5723                         nchk = TAILQ_NEXT(chk, sctp_next);
5724                         /* Here we must move to the sent queue and mark */
5725                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5726                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5727                                         if (chk->data) {
5728                                                 /*
5729                                                  * We release the book_size
5730                                                  * if the mbuf is here
5731                                                  */
5732                                                 int ret_spc;
5733
5734                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5735                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5736                                                     SCTP_SO_LOCKED);
5737
5738                                                 freed_spc += ret_spc;
5739                                                 if (freed_spc >= dataout) {
5740                                                         return;
5741                                                 }
5742                                         }       /* end if chk->data */
5743                                 }       /* end if right class */
5744                         }       /* end if chk pr-sctp */
5745                         chk = nchk;
5746                 }               /* end while (chk) */
5747         }                       /* if enabled in asoc */
5748 }
5749
5750 int
5751 sctp_get_frag_point(struct sctp_tcb *stcb,
5752     struct sctp_association *asoc)
5753 {
5754         int siz, ovh;
5755
5756         /*
5757          * For endpoints that have both v6 and v4 addresses we must reserve
5758          * room for the ipv6 header, for those that are only dealing with V4
5759          * we use a larger frag point.
5760          */
5761         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5762                 ovh = SCTP_MED_OVERHEAD;
5763         } else {
5764                 ovh = SCTP_MED_V4_OVERHEAD;
5765         }
5766
5767         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5768                 siz = asoc->smallest_mtu - ovh;
5769         else
5770                 siz = (stcb->asoc.sctp_frag_point - ovh);
5771         /*
5772          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5773          */
5774         /* A data chunk MUST fit in a cluster */
5775         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5776         /* } */
5777
5778         /* adjust for an AUTH chunk if DATA requires auth */
5779         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5780                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5781
5782         if (siz % 4) {
5783                 /* make it an even word boundary please */
5784                 siz -= (siz % 4);
5785         }
5786         return (siz);
5787 }
5788
5789 static void
5790 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5791 {
5792         sp->pr_sctp_on = 0;
5793         /*
5794          * We assume that the user wants PR_SCTP_TTL if the user provides a
5795          * positive lifetime but does not specify any PR_SCTP policy. This
5796          * is a BAD assumption and causes problems at least with the
5797          * U-Vancovers MPI folks. I will change this to be no policy means
5798          * NO PR-SCTP.
5799          */
5800         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5801                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5802                 sp->pr_sctp_on = 1;
5803         } else {
5804                 return;
5805         }
5806         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5807         case CHUNK_FLAGS_PR_SCTP_BUF:
5808                 /*
5809                  * Time to live is a priority stored in tv_sec when doing
5810                  * the buffer drop thing.
5811                  */
5812                 sp->ts.tv_sec = sp->timetolive;
5813                 sp->ts.tv_usec = 0;
5814                 break;
5815         case CHUNK_FLAGS_PR_SCTP_TTL:
5816                 {
5817                         struct timeval tv;
5818
5819                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5820                         tv.tv_sec = sp->timetolive / 1000;
5821                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5822                         /*
5823                          * TODO sctp_constants.h needs alternative time
5824                          * macros when _KERNEL is undefined.
5825                          */
5826                         timevaladd(&sp->ts, &tv);
5827                 }
5828                 break;
5829         case CHUNK_FLAGS_PR_SCTP_RTX:
5830                 /*
5831                  * Time to live is a the number or retransmissions stored in
5832                  * tv_sec.
5833                  */
5834                 sp->ts.tv_sec = sp->timetolive;
5835                 sp->ts.tv_usec = 0;
5836                 break;
5837         default:
5838                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5839                     "Unknown PR_SCTP policy %u.\n",
5840                     PR_SCTP_POLICY(sp->sinfo_flags));
5841                 break;
5842         }
5843 }
5844
5845 static int
5846 sctp_msg_append(struct sctp_tcb *stcb,
5847     struct sctp_nets *net,
5848     struct mbuf *m,
5849     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5850 {
5851         int error = 0, holds_lock;
5852         struct mbuf *at;
5853         struct sctp_stream_queue_pending *sp = NULL;
5854         struct sctp_stream_out *strm;
5855
5856         /*
5857          * Given an mbuf chain, put it into the association send queue and
5858          * place it on the wheel
5859          */
5860         holds_lock = hold_stcb_lock;
5861         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5862                 /* Invalid stream number */
5863                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5864                 error = EINVAL;
5865                 goto out_now;
5866         }
5867         if ((stcb->asoc.stream_locked) &&
5868             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5869                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5870                 error = EINVAL;
5871                 goto out_now;
5872         }
5873         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5874         /* Now can we send this? */
5875         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5876             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5877             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5878             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5879                 /* got data while shutting down */
5880                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5881                 error = ECONNRESET;
5882                 goto out_now;
5883         }
5884         sctp_alloc_a_strmoq(stcb, sp);
5885         if (sp == NULL) {
5886                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5887                 error = ENOMEM;
5888                 goto out_now;
5889         }
5890         sp->sinfo_flags = srcv->sinfo_flags;
5891         sp->timetolive = srcv->sinfo_timetolive;
5892         sp->ppid = srcv->sinfo_ppid;
5893         sp->context = srcv->sinfo_context;
5894         sp->strseq = 0;
5895         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5896                 sp->net = net;
5897                 atomic_add_int(&sp->net->ref_count, 1);
5898         } else {
5899                 sp->net = NULL;
5900         }
5901         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5902         sp->stream = srcv->sinfo_stream;
5903         sp->msg_is_complete = 1;
5904         sp->sender_all_done = 1;
5905         sp->some_taken = 0;
5906         sp->data = m;
5907         sp->tail_mbuf = NULL;
5908         sp->length = 0;
5909         at = m;
5910         sctp_set_prsctp_policy(sp);
5911         /*
5912          * We could in theory (for sendall) sifa the length in, but we would
5913          * still have to hunt through the chain since we need to setup the
5914          * tail_mbuf
5915          */
5916         while (at) {
5917                 if (SCTP_BUF_NEXT(at) == NULL)
5918                         sp->tail_mbuf = at;
5919                 sp->length += SCTP_BUF_LEN(at);
5920                 at = SCTP_BUF_NEXT(at);
5921         }
5922         SCTP_TCB_SEND_LOCK(stcb);
5923         sctp_snd_sb_alloc(stcb, sp->length);
5924         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5925         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5926         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5927                 sp->strseq = strm->next_sequence_sent;
5928                 strm->next_sequence_sent++;
5929         }
5930         if ((strm->next_spoke.tqe_next == NULL) &&
5931             (strm->next_spoke.tqe_prev == NULL)) {
5932                 /* Not on wheel, insert */
5933                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5934         }
5935         m = NULL;
5936         SCTP_TCB_SEND_UNLOCK(stcb);
5937 out_now:
5938         if (m) {
5939                 sctp_m_freem(m);
5940         }
5941         return (error);
5942 }
5943
5944
5945 static struct mbuf *
5946 sctp_copy_mbufchain(struct mbuf *clonechain,
5947     struct mbuf *outchain,
5948     struct mbuf **endofchain,
5949     int can_take_mbuf,
5950     int sizeofcpy,
5951     uint8_t copy_by_ref)
5952 {
5953         struct mbuf *m;
5954         struct mbuf *appendchain;
5955         caddr_t cp;
5956         int len;
5957
5958         if (endofchain == NULL) {
5959                 /* error */
5960 error_out:
5961                 if (outchain)
5962                         sctp_m_freem(outchain);
5963                 return (NULL);
5964         }
5965         if (can_take_mbuf) {
5966                 appendchain = clonechain;
5967         } else {
5968                 if (!copy_by_ref &&
5969                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5970                     ) {
5971                         /* Its not in a cluster */
5972                         if (*endofchain == NULL) {
5973                                 /* lets get a mbuf cluster */
5974                                 if (outchain == NULL) {
5975                                         /* This is the general case */
5976                         new_mbuf:
5977                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5978                                         if (outchain == NULL) {
5979                                                 goto error_out;
5980                                         }
5981                                         SCTP_BUF_LEN(outchain) = 0;
5982                                         *endofchain = outchain;
5983                                         /* get the prepend space */
5984                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5985                                 } else {
5986                                         /*
5987                                          * We really should not get a NULL
5988                                          * in endofchain
5989                                          */
5990                                         /* find end */
5991                                         m = outchain;
5992                                         while (m) {
5993                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5994                                                         *endofchain = m;
5995                                                         break;
5996                                                 }
5997                                                 m = SCTP_BUF_NEXT(m);
5998                                         }
5999                                         /* sanity */
6000                                         if (*endofchain == NULL) {
6001                                                 /*
6002                                                  * huh, TSNH XXX maybe we
6003                                                  * should panic
6004                                                  */
6005                                                 sctp_m_freem(outchain);
6006                                                 goto new_mbuf;
6007                                         }
6008                                 }
6009                                 /* get the new end of length */
6010                                 len = M_TRAILINGSPACE(*endofchain);
6011                         } else {
6012                                 /* how much is left at the end? */
6013                                 len = M_TRAILINGSPACE(*endofchain);
6014                         }
6015                         /* Find the end of the data, for appending */
6016                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6017
6018                         /* Now lets copy it out */
6019                         if (len >= sizeofcpy) {
6020                                 /* It all fits, copy it in */
6021                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6022                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6023                         } else {
6024                                 /* fill up the end of the chain */
6025                                 if (len > 0) {
6026                                         m_copydata(clonechain, 0, len, cp);
6027                                         SCTP_BUF_LEN((*endofchain)) += len;
6028                                         /* now we need another one */
6029                                         sizeofcpy -= len;
6030                                 }
6031                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6032                                 if (m == NULL) {
6033                                         /* We failed */
6034                                         goto error_out;
6035                                 }
6036                                 SCTP_BUF_NEXT((*endofchain)) = m;
6037                                 *endofchain = m;
6038                                 cp = mtod((*endofchain), caddr_t);
6039                                 m_copydata(clonechain, len, sizeofcpy, cp);
6040                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6041                         }
6042                         return (outchain);
6043                 } else {
6044                         /* copy the old fashion way */
6045                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6046 #ifdef SCTP_MBUF_LOGGING
6047                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6048                                 struct mbuf *mat;
6049
6050                                 mat = appendchain;
6051                                 while (mat) {
6052                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6053                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6054                                         }
6055                                         mat = SCTP_BUF_NEXT(mat);
6056                                 }
6057                         }
6058 #endif
6059                 }
6060         }
6061         if (appendchain == NULL) {
6062                 /* error */
6063                 if (outchain)
6064                         sctp_m_freem(outchain);
6065                 return (NULL);
6066         }
6067         if (outchain) {
6068                 /* tack on to the end */
6069                 if (*endofchain != NULL) {
6070                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6071                 } else {
6072                         m = outchain;
6073                         while (m) {
6074                                 if (SCTP_BUF_NEXT(m) == NULL) {
6075                                         SCTP_BUF_NEXT(m) = appendchain;
6076                                         break;
6077                                 }
6078                                 m = SCTP_BUF_NEXT(m);
6079                         }
6080                 }
6081                 /*
6082                  * save off the end and update the end-chain postion
6083                  */
6084                 m = appendchain;
6085                 while (m) {
6086                         if (SCTP_BUF_NEXT(m) == NULL) {
6087                                 *endofchain = m;
6088                                 break;
6089                         }
6090                         m = SCTP_BUF_NEXT(m);
6091                 }
6092                 return (outchain);
6093         } else {
6094                 /* save off the end and update the end-chain postion */
6095                 m = appendchain;
6096                 while (m) {
6097                         if (SCTP_BUF_NEXT(m) == NULL) {
6098                                 *endofchain = m;
6099                                 break;
6100                         }
6101                         m = SCTP_BUF_NEXT(m);
6102                 }
6103                 return (appendchain);
6104         }
6105 }
6106
6107 int
6108 sctp_med_chunk_output(struct sctp_inpcb *inp,
6109     struct sctp_tcb *stcb,
6110     struct sctp_association *asoc,
6111     int *num_out,
6112     int *reason_code,
6113     int control_only, int from_where,
6114     struct timeval *now, int *now_filled, int frag_point, int so_locked
6115 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6116     SCTP_UNUSED
6117 #endif
6118 );
6119
6120 static void
6121 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6122     uint32_t val)
6123 {
6124         struct sctp_copy_all *ca;
6125         struct mbuf *m;
6126         int ret = 0;
6127         int added_control = 0;
6128         int un_sent, do_chunk_output = 1;
6129         struct sctp_association *asoc;
6130
6131         ca = (struct sctp_copy_all *)ptr;
6132         if (ca->m == NULL) {
6133                 return;
6134         }
6135         if (ca->inp != inp) {
6136                 /* TSNH */
6137                 return;
6138         }
6139         if ((ca->m) && ca->sndlen) {
6140                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6141                 if (m == NULL) {
6142                         /* can't copy so we are done */
6143                         ca->cnt_failed++;
6144                         return;
6145                 }
6146 #ifdef SCTP_MBUF_LOGGING
6147                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6148                         struct mbuf *mat;
6149
6150                         mat = m;
6151                         while (mat) {
6152                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6153                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6154                                 }
6155                                 mat = SCTP_BUF_NEXT(mat);
6156                         }
6157                 }
6158 #endif
6159         } else {
6160                 m = NULL;
6161         }
6162         SCTP_TCB_LOCK_ASSERT(stcb);
6163         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6164                 /* Abort this assoc with m as the user defined reason */
6165                 if (m) {
6166                         struct sctp_paramhdr *ph;
6167
6168                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6169                         if (m) {
6170                                 ph = mtod(m, struct sctp_paramhdr *);
6171                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6172                                 ph->param_length = htons(ca->sndlen);
6173                         }
6174                         /*
6175                          * We add one here to keep the assoc from
6176                          * dis-appearing on us.
6177                          */
6178                         atomic_add_int(&stcb->asoc.refcnt, 1);
6179                         sctp_abort_an_association(inp, stcb,
6180                             SCTP_RESPONSE_TO_USER_REQ,
6181                             m, SCTP_SO_NOT_LOCKED);
6182                         /*
6183                          * sctp_abort_an_association calls sctp_free_asoc()
6184                          * free association will NOT free it since we
6185                          * incremented the refcnt .. we do this to prevent
6186                          * it being freed and things getting tricky since we
6187                          * could end up (from free_asoc) calling inpcb_free
6188                          * which would get a recursive lock call to the
6189                          * iterator lock.. But as a consequence of that the
6190                          * stcb will return to us un-locked.. since
6191                          * free_asoc returns with either no TCB or the TCB
6192                          * unlocked, we must relock.. to unlock in the
6193                          * iterator timer :-0
6194                          */
6195                         SCTP_TCB_LOCK(stcb);
6196                         atomic_add_int(&stcb->asoc.refcnt, -1);
6197                         goto no_chunk_output;
6198                 }
6199         } else {
6200                 if (m) {
6201                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6202                             &ca->sndrcv, 1);
6203                 }
6204                 asoc = &stcb->asoc;
6205                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6206                         /* shutdown this assoc */
6207                         int cnt;
6208
6209                         cnt = sctp_is_there_unsent_data(stcb);
6210
6211                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6212                             TAILQ_EMPTY(&asoc->sent_queue) &&
6213                             (cnt == 0)) {
6214                                 if (asoc->locked_on_sending) {
6215                                         goto abort_anyway;
6216                                 }
6217                                 /*
6218                                  * there is nothing queued to send, so I'm
6219                                  * done...
6220                                  */
6221                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6222                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6223                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6224                                         /*
6225                                          * only send SHUTDOWN the first time
6226                                          * through
6227                                          */
6228                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6229                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6230                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6231                                         }
6232                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6233                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6234                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6235                                             asoc->primary_destination);
6236                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6237                                             asoc->primary_destination);
6238                                         added_control = 1;
6239                                         do_chunk_output = 0;
6240                                 }
6241                         } else {
6242                                 /*
6243                                  * we still got (or just got) data to send,
6244                                  * so set SHUTDOWN_PENDING
6245                                  */
6246                                 /*
6247                                  * XXX sockets draft says that SCTP_EOF
6248                                  * should be sent with no data.  currently,
6249                                  * we will allow user data to be sent first
6250                                  * and move to SHUTDOWN-PENDING
6251                                  */
6252                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6253                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6254                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6255                                         if (asoc->locked_on_sending) {
6256                                                 /*
6257                                                  * Locked to send out the
6258                                                  * data
6259                                                  */
6260                                                 struct sctp_stream_queue_pending *sp;
6261
6262                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6263                                                 if (sp) {
6264                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6265                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6266                                                 }
6267                                         }
6268                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6269                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6270                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6271                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6272                                 abort_anyway:
6273                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6274                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6275                                                     SCTP_RESPONSE_TO_USER_REQ,
6276                                                     NULL, SCTP_SO_NOT_LOCKED);
6277                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6278                                                 goto no_chunk_output;
6279                                         }
6280                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6281                                             asoc->primary_destination);
6282                                 }
6283                         }
6284
6285                 }
6286         }
6287         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6288             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6289
6290         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6291             (stcb->asoc.total_flight > 0) &&
6292             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6293             ) {
6294                 do_chunk_output = 0;
6295         }
6296         if (do_chunk_output)
6297                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6298         else if (added_control) {
6299                 int num_out = 0, reason = 0, now_filled = 0;
6300                 struct timeval now;
6301                 int frag_point;
6302
6303                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6304                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6305                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6306         }
6307 no_chunk_output:
6308         if (ret) {
6309                 ca->cnt_failed++;
6310         } else {
6311                 ca->cnt_sent++;
6312         }
6313 }
6314
6315 static void
6316 sctp_sendall_completes(void *ptr, uint32_t val)
6317 {
6318         struct sctp_copy_all *ca;
6319
6320         ca = (struct sctp_copy_all *)ptr;
6321         /*
6322          * Do a notify here? Kacheong suggests that the notify be done at
6323          * the send time.. so you would push up a notification if any send
6324          * failed. Don't know if this is feasable since the only failures we
6325          * have is "memory" related and if you cannot get an mbuf to send
6326          * the data you surely can't get an mbuf to send up to notify the
6327          * user you can't send the data :->
6328          */
6329
6330         /* now free everything */
6331         sctp_m_freem(ca->m);
6332         SCTP_FREE(ca, SCTP_M_COPYAL);
6333 }
6334
6335
6336 #define MC_ALIGN(m, len) do {                                           \
6337         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6338 } while (0)
6339
6340
6341
6342 static struct mbuf *
6343 sctp_copy_out_all(struct uio *uio, int len)
6344 {
6345         struct mbuf *ret, *at;
6346         int left, willcpy, cancpy, error;
6347
6348         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6349         if (ret == NULL) {
6350                 /* TSNH */
6351                 return (NULL);
6352         }
6353         left = len;
6354         SCTP_BUF_LEN(ret) = 0;
6355         /* save space for the data chunk header */
6356         cancpy = M_TRAILINGSPACE(ret);
6357         willcpy = min(cancpy, left);
6358         at = ret;
6359         while (left > 0) {
6360                 /* Align data to the end */
6361                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6362                 if (error) {
6363         err_out_now:
6364                         sctp_m_freem(at);
6365                         return (NULL);
6366                 }
6367                 SCTP_BUF_LEN(at) = willcpy;
6368                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6369                 left -= willcpy;
6370                 if (left > 0) {
6371                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6372                         if (SCTP_BUF_NEXT(at) == NULL) {
6373                                 goto err_out_now;
6374                         }
6375                         at = SCTP_BUF_NEXT(at);
6376                         SCTP_BUF_LEN(at) = 0;
6377                         cancpy = M_TRAILINGSPACE(at);
6378                         willcpy = min(cancpy, left);
6379                 }
6380         }
6381         return (ret);
6382 }
6383
6384 static int
6385 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6386     struct sctp_sndrcvinfo *srcv)
6387 {
6388         int ret;
6389         struct sctp_copy_all *ca;
6390
6391         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6392             SCTP_M_COPYAL);
6393         if (ca == NULL) {
6394                 sctp_m_freem(m);
6395                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6396                 return (ENOMEM);
6397         }
6398         memset(ca, 0, sizeof(struct sctp_copy_all));
6399
6400         ca->inp = inp;
6401         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6402         /*
6403          * take off the sendall flag, it would be bad if we failed to do
6404          * this :-0
6405          */
6406         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6407         /* get length and mbuf chain */
6408         if (uio) {
6409                 ca->sndlen = uio->uio_resid;
6410                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6411                 if (ca->m == NULL) {
6412                         SCTP_FREE(ca, SCTP_M_COPYAL);
6413                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6414                         return (ENOMEM);
6415                 }
6416         } else {
6417                 /* Gather the length of the send */
6418                 struct mbuf *mat;
6419
6420                 mat = m;
6421                 ca->sndlen = 0;
6422                 while (m) {
6423                         ca->sndlen += SCTP_BUF_LEN(m);
6424                         m = SCTP_BUF_NEXT(m);
6425                 }
6426                 ca->m = mat;
6427         }
6428         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6429             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6430             SCTP_ASOC_ANY_STATE,
6431             (void *)ca, 0,
6432             sctp_sendall_completes, inp, 1);
6433         if (ret) {
6434                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6435                 SCTP_FREE(ca, SCTP_M_COPYAL);
6436                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6437                 return (EFAULT);
6438         }
6439         return (0);
6440 }
6441
6442
6443 void
6444 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6445 {
6446         struct sctp_tmit_chunk *chk, *nchk;
6447
6448         chk = TAILQ_FIRST(&asoc->control_send_queue);
6449         while (chk) {
6450                 nchk = TAILQ_NEXT(chk, sctp_next);
6451                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6452                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6453                         if (chk->data) {
6454                                 sctp_m_freem(chk->data);
6455                                 chk->data = NULL;
6456                         }
6457                         asoc->ctrl_queue_cnt--;
6458                         sctp_free_a_chunk(stcb, chk);
6459                 }
6460                 chk = nchk;
6461         }
6462 }
6463
6464 void
6465 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6466 {
6467         struct sctp_association *asoc;
6468         struct sctp_tmit_chunk *chk, *chk_tmp;
6469         struct sctp_asconf_chunk *acp;
6470
6471         asoc = &stcb->asoc;
6472         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6473             chk = chk_tmp) {
6474                 /* get next chk */
6475                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6476                 /* find SCTP_ASCONF chunk in queue */
6477                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6478                         if (chk->data) {
6479                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6480                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6481                                         /* Not Acked yet */
6482                                         break;
6483                                 }
6484                         }
6485                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6486                         if (chk->data) {
6487                                 sctp_m_freem(chk->data);
6488                                 chk->data = NULL;
6489                         }
6490                         asoc->ctrl_queue_cnt--;
6491                         sctp_free_a_chunk(stcb, chk);
6492                 }
6493         }
6494 }
6495
6496
6497 static void
6498 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6499     struct sctp_association *asoc,
6500     struct sctp_tmit_chunk **data_list,
6501     int bundle_at,
6502     struct sctp_nets *net)
6503 {
6504         int i;
6505         struct sctp_tmit_chunk *tp1;
6506
6507         for (i = 0; i < bundle_at; i++) {
6508                 /* off of the send queue */
6509                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6510                 asoc->send_queue_cnt--;
6511                 if (i > 0) {
6512                         /*
6513                          * Any chunk NOT 0 you zap the time chunk 0 gets
6514                          * zapped or set based on if a RTO measurment is
6515                          * needed.
6516                          */
6517                         data_list[i]->do_rtt = 0;
6518                 }
6519                 /* record time */
6520                 data_list[i]->sent_rcv_time = net->last_sent_time;
6521                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6522                 if (data_list[i]->whoTo == NULL) {
6523                         data_list[i]->whoTo = net;
6524                         atomic_add_int(&net->ref_count, 1);
6525                 }
6526                 /* on to the sent queue */
6527                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6528                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6529                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6530                         struct sctp_tmit_chunk *tpp;
6531
6532                         /* need to move back */
6533         back_up_more:
6534                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6535                         if (tpp == NULL) {
6536                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6537                                 goto all_done;
6538                         }
6539                         tp1 = tpp;
6540                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6541                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6542                                 goto back_up_more;
6543                         }
6544                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6545                 } else {
6546                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6547                             data_list[i],
6548                             sctp_next);
6549                 }
6550 all_done:
6551                 /* This does not lower until the cum-ack passes it */
6552                 asoc->sent_queue_cnt++;
6553                 if ((asoc->peers_rwnd <= 0) &&
6554                     (asoc->total_flight == 0) &&
6555                     (bundle_at == 1)) {
6556                         /* Mark the chunk as being a window probe */
6557                         SCTP_STAT_INCR(sctps_windowprobed);
6558                 }
6559 #ifdef SCTP_AUDITING_ENABLED
6560                 sctp_audit_log(0xC2, 3);
6561 #endif
6562                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6563                 data_list[i]->snd_count = 1;
6564                 data_list[i]->rec.data.chunk_was_revoked = 0;
6565                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6566                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6567                             data_list[i]->whoTo->flight_size,
6568                             data_list[i]->book_size,
6569                             (uintptr_t) data_list[i]->whoTo,
6570                             data_list[i]->rec.data.TSN_seq);
6571                 }
6572                 sctp_flight_size_increase(data_list[i]);
6573                 sctp_total_flight_increase(stcb, data_list[i]);
6574                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6575                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6576                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6577                 }
6578                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6579                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6580                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6581                         /* SWS sender side engages */
6582                         asoc->peers_rwnd = 0;
6583                 }
6584         }
6585 }
6586
6587 static void
6588 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6589 {
6590         struct sctp_tmit_chunk *chk, *nchk;
6591
6592         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6593             chk; chk = nchk) {
6594                 nchk = TAILQ_NEXT(chk, sctp_next);
6595                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6596                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6597                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6598                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6599                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6600                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6601                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6602                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6603                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6604                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6605                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6606                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6607                         /* Stray chunks must be cleaned up */
6608         clean_up_anyway:
6609                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6610                         if (chk->data) {
6611                                 sctp_m_freem(chk->data);
6612                                 chk->data = NULL;
6613                         }
6614                         asoc->ctrl_queue_cnt--;
6615                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6616                                 asoc->fwd_tsn_cnt--;
6617                         sctp_free_a_chunk(stcb, chk);
6618                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6619                         /* special handling, we must look into the param */
6620                         if (chk != asoc->str_reset) {
6621                                 goto clean_up_anyway;
6622                         }
6623                 }
6624         }
6625 }
6626
6627
6628 static int
6629 sctp_can_we_split_this(struct sctp_tcb *stcb,
6630     uint32_t length,
6631     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6632 {
6633         /*
6634          * Make a decision on if I should split a msg into multiple parts.
6635          * This is only asked of incomplete messages.
6636          */
6637         if (eeor_on) {
6638                 /*
6639                  * If we are doing EEOR we need to always send it if its the
6640                  * entire thing, since it might be all the guy is putting in
6641                  * the hopper.
6642                  */
6643                 if (goal_mtu >= length) {
6644                         /*-
6645                          * If we have data outstanding,
6646                          * we get another chance when the sack
6647                          * arrives to transmit - wait for more data
6648                          */
6649                         if (stcb->asoc.total_flight == 0) {
6650                                 /*
6651                                  * If nothing is in flight, we zero the
6652                                  * packet counter.
6653                                  */
6654                                 return (length);
6655                         }
6656                         return (0);
6657
6658                 } else {
6659                         /* You can fill the rest */
6660                         return (goal_mtu);
6661                 }
6662         }
6663         /*-
6664          * For those strange folk that make the send buffer
6665          * smaller than our fragmentation point, we can't
6666          * get a full msg in so we have to allow splitting.
6667          */
6668         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6669                 return (length);
6670         }
6671         if ((length <= goal_mtu) ||
6672             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6673                 /* Sub-optimial residual don't split in non-eeor mode. */
6674                 return (0);
6675         }
6676         /*
6677          * If we reach here length is larger than the goal_mtu. Do we wish
6678          * to split it for the sake of packet putting together?
6679          */
6680         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6681                 /* Its ok to split it */
6682                 return (min(goal_mtu, frag_point));
6683         }
6684         /* Nope, can't split */
6685         return (0);
6686
6687 }
6688
6689 static uint32_t
6690 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6691     struct sctp_stream_out *strq,
6692     uint32_t goal_mtu,
6693     uint32_t frag_point,
6694     int *locked,
6695     int *giveup,
6696     int eeor_mode,
6697     int *bail)
6698 {
6699         /* Move from the stream to the send_queue keeping track of the total */
6700         struct sctp_association *asoc;
6701         struct sctp_stream_queue_pending *sp;
6702         struct sctp_tmit_chunk *chk;
6703         struct sctp_data_chunk *dchkh;
6704         uint32_t to_move, length;
6705         uint8_t rcv_flags = 0;
6706         uint8_t some_taken;
6707         uint8_t send_lock_up = 0;
6708
6709         SCTP_TCB_LOCK_ASSERT(stcb);
6710         asoc = &stcb->asoc;
6711 one_more_time:
6712         /* sa_ignore FREED_MEMORY */
6713         sp = TAILQ_FIRST(&strq->outqueue);
6714         if (sp == NULL) {
6715                 *locked = 0;
6716                 if (send_lock_up == 0) {
6717                         SCTP_TCB_SEND_LOCK(stcb);
6718                         send_lock_up = 1;
6719                 }
6720                 sp = TAILQ_FIRST(&strq->outqueue);
6721                 if (sp) {
6722                         goto one_more_time;
6723                 }
6724                 if (strq->last_msg_incomplete) {
6725                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6726                             strq->stream_no,
6727                             strq->last_msg_incomplete);
6728                         strq->last_msg_incomplete = 0;
6729                 }
6730                 to_move = 0;
6731                 if (send_lock_up) {
6732                         SCTP_TCB_SEND_UNLOCK(stcb);
6733                         send_lock_up = 0;
6734                 }
6735                 goto out_of;
6736         }
6737         if ((sp->msg_is_complete) && (sp->length == 0)) {
6738                 if (sp->sender_all_done) {
6739                         /*
6740                          * We are doing differed cleanup. Last time through
6741                          * when we took all the data the sender_all_done was
6742                          * not set.
6743                          */
6744                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6745                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6746                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6747                                     sp->sender_all_done,
6748                                     sp->length,
6749                                     sp->msg_is_complete,
6750                                     sp->put_last_out,
6751                                     send_lock_up);
6752                         }
6753                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6754                                 SCTP_TCB_SEND_LOCK(stcb);
6755                                 send_lock_up = 1;
6756                         }
6757                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6758                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6759                         if (sp->net) {
6760                                 sctp_free_remote_addr(sp->net);
6761                                 sp->net = NULL;
6762                         }
6763                         if (sp->data) {
6764                                 sctp_m_freem(sp->data);
6765                                 sp->data = NULL;
6766                         }
6767                         sctp_free_a_strmoq(stcb, sp);
6768                         /* we can't be locked to it */
6769                         *locked = 0;
6770                         stcb->asoc.locked_on_sending = NULL;
6771                         if (send_lock_up) {
6772                                 SCTP_TCB_SEND_UNLOCK(stcb);
6773                                 send_lock_up = 0;
6774                         }
6775                         /* back to get the next msg */
6776                         goto one_more_time;
6777                 } else {
6778                         /*
6779                          * sender just finished this but still holds a
6780                          * reference
6781                          */
6782                         *locked = 1;
6783                         *giveup = 1;
6784                         to_move = 0;
6785                         goto out_of;
6786                 }
6787         } else {
6788                 /* is there some to get */
6789                 if (sp->length == 0) {
6790                         /* no */
6791                         *locked = 1;
6792                         *giveup = 1;
6793                         to_move = 0;
6794                         goto out_of;
6795                 } else if (sp->discard_rest) {
6796                         if (send_lock_up == 0) {
6797                                 SCTP_TCB_SEND_LOCK(stcb);
6798                                 send_lock_up = 1;
6799                         }
6800                         /* Whack down the size */
6801                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6802                         if ((stcb->sctp_socket != NULL) && \
6803                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6804                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6805                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6806                         }
6807                         if (sp->data) {
6808                                 sctp_m_freem(sp->data);
6809                                 sp->data = NULL;
6810                                 sp->tail_mbuf = NULL;
6811                         }
6812                         sp->length = 0;
6813                         sp->some_taken = 1;
6814                         *locked = 1;
6815                         *giveup = 1;
6816                         to_move = 0;
6817                         goto out_of;
6818                 }
6819         }
6820         some_taken = sp->some_taken;
6821         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6822                 sp->msg_is_complete = 1;
6823         }
6824 re_look:
6825         length = sp->length;
6826         if (sp->msg_is_complete) {
6827                 /* The message is complete */
6828                 to_move = min(length, frag_point);
6829                 if (to_move == length) {
6830                         /* All of it fits in the MTU */
6831                         if (sp->some_taken) {
6832                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6833                                 sp->put_last_out = 1;
6834                         } else {
6835                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6836                                 sp->put_last_out = 1;
6837                         }
6838                 } else {
6839                         /* Not all of it fits, we fragment */
6840                         if (sp->some_taken == 0) {
6841                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6842                         }
6843                         sp->some_taken = 1;
6844                 }
6845         } else {
6846                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6847                 if (to_move) {
6848                         /*-
6849                          * We use a snapshot of length in case it
6850                          * is expanding during the compare.
6851                          */
6852                         uint32_t llen;
6853
6854                         llen = length;
6855                         if (to_move >= llen) {
6856                                 to_move = llen;
6857                                 if (send_lock_up == 0) {
6858                                         /*-
6859                                          * We are taking all of an incomplete msg
6860                                          * thus we need a send lock.
6861                                          */
6862                                         SCTP_TCB_SEND_LOCK(stcb);
6863                                         send_lock_up = 1;
6864                                         if (sp->msg_is_complete) {
6865                                                 /*
6866                                                  * the sender finished the
6867                                                  * msg
6868                                                  */
6869                                                 goto re_look;
6870                                         }
6871                                 }
6872                         }
6873                         if (sp->some_taken == 0) {
6874                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6875                                 sp->some_taken = 1;
6876                         }
6877                 } else {
6878                         /* Nothing to take. */
6879                         if (sp->some_taken) {
6880                                 *locked = 1;
6881                         }
6882                         *giveup = 1;
6883                         to_move = 0;
6884                         goto out_of;
6885                 }
6886         }
6887
6888         /* If we reach here, we can copy out a chunk */
6889         sctp_alloc_a_chunk(stcb, chk);
6890         if (chk == NULL) {
6891                 /* No chunk memory */
6892                 *giveup = 1;
6893                 to_move = 0;
6894                 goto out_of;
6895         }
6896         /*
6897          * Setup for unordered if needed by looking at the user sent info
6898          * flags.
6899          */
6900         if (sp->sinfo_flags & SCTP_UNORDERED) {
6901                 rcv_flags |= SCTP_DATA_UNORDERED;
6902         }
6903         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6904             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6905                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6906         }
6907         /* clear out the chunk before setting up */
6908         memset(chk, 0, sizeof(*chk));
6909         chk->rec.data.rcv_flags = rcv_flags;
6910
6911         if (to_move >= length) {
6912                 /* we think we can steal the whole thing */
6913                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6914                         SCTP_TCB_SEND_LOCK(stcb);
6915                         send_lock_up = 1;
6916                 }
6917                 if (to_move < sp->length) {
6918                         /* bail, it changed */
6919                         goto dont_do_it;
6920                 }
6921                 chk->data = sp->data;
6922                 chk->last_mbuf = sp->tail_mbuf;
6923                 /* register the stealing */
6924                 sp->data = sp->tail_mbuf = NULL;
6925         } else {
6926                 struct mbuf *m;
6927
6928 dont_do_it:
6929                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6930                 chk->last_mbuf = NULL;
6931                 if (chk->data == NULL) {
6932                         sp->some_taken = some_taken;
6933                         sctp_free_a_chunk(stcb, chk);
6934                         *bail = 1;
6935                         to_move = 0;
6936                         goto out_of;
6937                 }
6938 #ifdef SCTP_MBUF_LOGGING
6939                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6940                         struct mbuf *mat;
6941
6942                         mat = chk->data;
6943                         while (mat) {
6944                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6945                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6946                                 }
6947                                 mat = SCTP_BUF_NEXT(mat);
6948                         }
6949                 }
6950 #endif
6951                 /* Pull off the data */
6952                 m_adj(sp->data, to_move);
6953                 /* Now lets work our way down and compact it */
6954                 m = sp->data;
6955                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6956                         sp->data = SCTP_BUF_NEXT(m);
6957                         SCTP_BUF_NEXT(m) = NULL;
6958                         if (sp->tail_mbuf == m) {
6959                                 /*-
6960                                  * Freeing tail? TSNH since
6961                                  * we supposedly were taking less
6962                                  * than the sp->length.
6963                                  */
6964 #ifdef INVARIANTS
6965                                 panic("Huh, freing tail? - TSNH");
6966 #else
6967                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6968                                 sp->tail_mbuf = sp->data = NULL;
6969                                 sp->length = 0;
6970 #endif
6971
6972                         }
6973                         sctp_m_free(m);
6974                         m = sp->data;
6975                 }
6976         }
6977         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6978                 chk->copy_by_ref = 1;
6979         } else {
6980                 chk->copy_by_ref = 0;
6981         }
6982         /*
6983          * get last_mbuf and counts of mb useage This is ugly but hopefully
6984          * its only one mbuf.
6985          */
6986         if (chk->last_mbuf == NULL) {
6987                 chk->last_mbuf = chk->data;
6988                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6989                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6990                 }
6991         }
6992         if (to_move > length) {
6993                 /*- This should not happen either
6994                  * since we always lower to_move to the size
6995                  * of sp->length if its larger.
6996                  */
6997 #ifdef INVARIANTS
6998                 panic("Huh, how can to_move be larger?");
6999 #else
7000                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7001                 sp->length = 0;
7002 #endif
7003         } else {
7004                 atomic_subtract_int(&sp->length, to_move);
7005         }
7006         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7007                 /* Not enough room for a chunk header, get some */
7008                 struct mbuf *m;
7009
7010                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7011                 if (m == NULL) {
7012                         /*
7013                          * we're in trouble here. _PREPEND below will free
7014                          * all the data if there is no leading space, so we
7015                          * must put the data back and restore.
7016                          */
7017                         if (send_lock_up == 0) {
7018                                 SCTP_TCB_SEND_LOCK(stcb);
7019                                 send_lock_up = 1;
7020                         }
7021                         if (chk->data == NULL) {
7022                                 /* unsteal the data */
7023                                 sp->data = chk->data;
7024                                 sp->tail_mbuf = chk->last_mbuf;
7025                         } else {
7026                                 struct mbuf *m_tmp;
7027
7028                                 /* reassemble the data */
7029                                 m_tmp = sp->data;
7030                                 sp->data = chk->data;
7031                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7032                         }
7033                         sp->some_taken = some_taken;
7034                         atomic_add_int(&sp->length, to_move);
7035                         chk->data = NULL;
7036                         *bail = 1;
7037                         sctp_free_a_chunk(stcb, chk);
7038                         to_move = 0;
7039                         goto out_of;
7040                 } else {
7041                         SCTP_BUF_LEN(m) = 0;
7042                         SCTP_BUF_NEXT(m) = chk->data;
7043                         chk->data = m;
7044                         M_ALIGN(chk->data, 4);
7045                 }
7046         }
7047         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7048         if (chk->data == NULL) {
7049                 /* HELP, TSNH since we assured it would not above? */
7050 #ifdef INVARIANTS
7051                 panic("prepend failes HELP?");
7052 #else
7053                 SCTP_PRINTF("prepend fails HELP?\n");
7054                 sctp_free_a_chunk(stcb, chk);
7055 #endif
7056                 *bail = 1;
7057                 to_move = 0;
7058                 goto out_of;
7059         }
7060         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7061         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7062         chk->book_size_scale = 0;
7063         chk->sent = SCTP_DATAGRAM_UNSENT;
7064
7065         chk->flags = 0;
7066         chk->asoc = &stcb->asoc;
7067         chk->pad_inplace = 0;
7068         chk->no_fr_allowed = 0;
7069         chk->rec.data.stream_seq = sp->strseq;
7070         chk->rec.data.stream_number = sp->stream;
7071         chk->rec.data.payloadtype = sp->ppid;
7072         chk->rec.data.context = sp->context;
7073         chk->rec.data.doing_fast_retransmit = 0;
7074         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7075
7076         chk->rec.data.timetodrop = sp->ts;
7077         chk->flags = sp->act_flags;
7078
7079         if (sp->net) {
7080                 chk->whoTo = sp->net;
7081                 atomic_add_int(&chk->whoTo->ref_count, 1);
7082         } else
7083                 chk->whoTo = NULL;
7084
7085         if (sp->holds_key_ref) {
7086                 chk->auth_keyid = sp->auth_keyid;
7087                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7088                 chk->holds_key_ref = 1;
7089         }
7090         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7091         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7092                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7093                     (uintptr_t) stcb, sp->length,
7094                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7095                     chk->rec.data.TSN_seq);
7096         }
7097         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7098         /*
7099          * Put the rest of the things in place now. Size was done earlier in
7100          * previous loop prior to padding.
7101          */
7102
7103 #ifdef SCTP_ASOCLOG_OF_TSNS
7104         SCTP_TCB_LOCK_ASSERT(stcb);
7105         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7106                 asoc->tsn_out_at = 0;
7107                 asoc->tsn_out_wrapped = 1;
7108         }
7109         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7110         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7111         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7112         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7113         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7114         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7115         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7116         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7117         asoc->tsn_out_at++;
7118 #endif
7119
7120         dchkh->ch.chunk_type = SCTP_DATA;
7121         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7122         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7123         dchkh->dp.stream_id = htons(strq->stream_no);
7124         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7125         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7126         dchkh->ch.chunk_length = htons(chk->send_size);
7127         /* Now advance the chk->send_size by the actual pad needed. */
7128         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7129                 /* need a pad */
7130                 struct mbuf *lm;
7131                 int pads;
7132
7133                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7134                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7135                         chk->pad_inplace = 1;
7136                 }
7137                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7138                         /* pad added an mbuf */
7139                         chk->last_mbuf = lm;
7140                 }
7141                 chk->send_size += pads;
7142         }
7143         /* We only re-set the policy if it is on */
7144         if (sp->pr_sctp_on) {
7145                 sctp_set_prsctp_policy(sp);
7146                 asoc->pr_sctp_cnt++;
7147                 chk->pr_sctp_on = 1;
7148         } else {
7149                 chk->pr_sctp_on = 0;
7150         }
7151         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7152                 /* All done pull and kill the message */
7153                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7154                 if (sp->put_last_out == 0) {
7155                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7156                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7157                             sp->sender_all_done,
7158                             sp->length,
7159                             sp->msg_is_complete,
7160                             sp->put_last_out,
7161                             send_lock_up);
7162                 }
7163                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7164                         SCTP_TCB_SEND_LOCK(stcb);
7165                         send_lock_up = 1;
7166                 }
7167                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7168                 if (sp->net) {
7169                         sctp_free_remote_addr(sp->net);
7170                         sp->net = NULL;
7171                 }
7172                 if (sp->data) {
7173                         sctp_m_freem(sp->data);
7174                         sp->data = NULL;
7175                 }
7176                 sctp_free_a_strmoq(stcb, sp);
7177
7178                 /* we can't be locked to it */
7179                 *locked = 0;
7180                 stcb->asoc.locked_on_sending = NULL;
7181         } else {
7182                 /* more to go, we are locked */
7183                 *locked = 1;
7184         }
7185         asoc->chunks_on_out_queue++;
7186         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7187         asoc->send_queue_cnt++;
7188 out_of:
7189         if (send_lock_up) {
7190                 SCTP_TCB_SEND_UNLOCK(stcb);
7191                 send_lock_up = 0;
7192         }
7193         return (to_move);
7194 }
7195
7196
7197 static struct sctp_stream_out *
7198 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7199 {
7200         struct sctp_stream_out *strq;
7201
7202         /* Find the next stream to use */
7203         if (asoc->last_out_stream == NULL) {
7204                 strq = TAILQ_FIRST(&asoc->out_wheel);
7205         } else {
7206                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7207                 if (strq == NULL) {
7208                         strq = TAILQ_FIRST(&asoc->out_wheel);
7209                 }
7210         }
7211         return (strq);
7212 }
7213
7214
7215 static void
7216 sctp_fill_outqueue(struct sctp_tcb *stcb,
7217     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7218 {
7219         struct sctp_association *asoc;
7220         struct sctp_stream_out *strq, *strqn;
7221         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7222         int locked, giveup;
7223         struct sctp_stream_queue_pending *sp;
7224
7225         SCTP_TCB_LOCK_ASSERT(stcb);
7226         asoc = &stcb->asoc;
7227 #ifdef INET6
7228         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7229                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7230         } else {
7231                 /* ?? not sure what else to do */
7232                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7233         }
7234 #else
7235         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7236 #endif
7237         /* Need an allowance for the data chunk header too */
7238         goal_mtu -= sizeof(struct sctp_data_chunk);
7239
7240         /* must make even word boundary */
7241         goal_mtu &= 0xfffffffc;
7242         if (asoc->locked_on_sending) {
7243                 /* We are stuck on one stream until the message completes. */
7244                 strq = asoc->locked_on_sending;
7245                 locked = 1;
7246         } else {
7247                 strq = sctp_select_a_stream(stcb, asoc);
7248                 locked = 0;
7249         }
7250         strqn = strq;
7251         while ((goal_mtu > 0) && strq) {
7252                 sp = TAILQ_FIRST(&strq->outqueue);
7253                 if (sp == NULL) {
7254                         break;
7255                 }
7256                 /**
7257                  * Honor the users' choice if given. If not given,
7258                  * pull it only to the primary path in case of not using
7259                  * CMT.
7260                  */
7261                 if (((sp->net != NULL) &&
7262                     (sp->net != net)) ||
7263                     ((sp->net == NULL) &&
7264                     (asoc->sctp_cmt_on_off == 0) &&
7265                     (asoc->primary_destination != net))) {
7266                         /* Do not pull to this network */
7267                         if (locked) {
7268                                 break;
7269                         } else {
7270                                 strq = sctp_select_a_stream(stcb, asoc);
7271                                 if (strq == NULL)
7272                                         /* none left */
7273                                         break;
7274                                 if (strqn == strq) {
7275                                         /* I have circled */
7276                                         break;
7277                                 }
7278                                 continue;
7279                         }
7280                 }
7281                 giveup = 0;
7282                 bail = 0;
7283                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7284                     &giveup, eeor_mode, &bail);
7285                 if (moved_how_much)
7286                         asoc->last_out_stream = strq;
7287
7288                 if (locked) {
7289                         asoc->locked_on_sending = strq;
7290                         if ((moved_how_much == 0) || (giveup) || bail)
7291                                 /* no more to move for now */
7292                                 break;
7293                 } else {
7294                         asoc->locked_on_sending = NULL;
7295                         if (TAILQ_EMPTY(&strq->outqueue)) {
7296                                 if (strq == strqn) {
7297                                         /* Must move start to next one */
7298                                         strqn = TAILQ_NEXT(strq, next_spoke);
7299                                         if (strqn == NULL) {
7300                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7301                                                 if (strqn == NULL) {
7302                                                         break;
7303                                                 }
7304                                         }
7305                                 }
7306                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7307                         }
7308                         if ((giveup) || bail) {
7309                                 break;
7310                         }
7311                         strq = sctp_select_a_stream(stcb, asoc);
7312                         if (strq == NULL) {
7313                                 break;
7314                         }
7315                 }
7316                 total_moved += moved_how_much;
7317                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7318                 goal_mtu &= 0xfffffffc;
7319         }
7320         if (bail)
7321                 *quit_now = 1;
7322
7323         if (total_moved == 0) {
7324                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7325                     (net == stcb->asoc.primary_destination)) {
7326                         /* ran dry for primary network net */
7327                         SCTP_STAT_INCR(sctps_primary_randry);
7328                 } else if (stcb->asoc.sctp_cmt_on_off == 1) {
7329                         /* ran dry with CMT on */
7330                         SCTP_STAT_INCR(sctps_cmt_randry);
7331                 }
7332         }
7333 }
7334
7335 void
7336 sctp_fix_ecn_echo(struct sctp_association *asoc)
7337 {
7338         struct sctp_tmit_chunk *chk;
7339
7340         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7341                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7342                         chk->sent = SCTP_DATAGRAM_UNSENT;
7343                 }
7344         }
7345 }
7346
7347 void
7348 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7349 {
7350         struct sctp_association *asoc;
7351         struct sctp_stream_out *outs;
7352         struct sctp_tmit_chunk *chk;
7353         struct sctp_stream_queue_pending *sp;
7354
7355         if (net == NULL) {
7356                 return;
7357         }
7358         asoc = &stcb->asoc;
7359         TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
7360                 TAILQ_FOREACH(sp, &outs->outqueue, next) {
7361                         if (sp->net == net) {
7362                                 sctp_free_remote_addr(sp->net);
7363                                 sp->net = NULL;
7364                         }
7365                 }
7366         }
7367         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7368                 if (chk->whoTo == net) {
7369                         sctp_free_remote_addr(chk->whoTo);
7370                         chk->whoTo = NULL;
7371                 }
7372         }
7373 }
7374
7375 int
7376 sctp_med_chunk_output(struct sctp_inpcb *inp,
7377     struct sctp_tcb *stcb,
7378     struct sctp_association *asoc,
7379     int *num_out,
7380     int *reason_code,
7381     int control_only, int from_where,
7382     struct timeval *now, int *now_filled, int frag_point, int so_locked
7383 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7384     SCTP_UNUSED
7385 #endif
7386 )
7387 {
7388         /*
7389          * Ok this is the generic chunk service queue. we must do the
7390          * following: - Service the stream queue that is next, moving any
7391          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7392          * LAST to the out queue in one pass) and assigning TSN's - Check to
7393          * see if the cwnd/rwnd allows any output, if so we go ahead and
7394          * fomulate and send the low level chunks. Making sure to combine
7395          * any control in the control chunk queue also.
7396          */
7397         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7398         struct mbuf *outchain, *endoutchain;
7399         struct sctp_tmit_chunk *chk, *nchk;
7400
7401         /* temp arrays for unlinking */
7402         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7403         int no_fragmentflg, error;
7404         unsigned int max_rwnd_per_dest, max_send_per_dest;
7405         int one_chunk, hbflag, skip_data_for_this_net;
7406         int asconf, cookie, no_out_cnt;
7407         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7408         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7409         int tsns_sent = 0;
7410         uint32_t auth_offset = 0;
7411         struct sctp_auth_chunk *auth = NULL;
7412         uint16_t auth_keyid;
7413         int override_ok = 1;
7414         int data_auth_reqd = 0;
7415
7416         /*
7417          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7418          * destination.
7419          */
7420         int pf_hbflag = 0;
7421         int quit_now = 0;
7422
7423         *num_out = 0;
7424         auth_keyid = stcb->asoc.authinfo.active_keyid;
7425
7426         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7427             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7428             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7429                 eeor_mode = 1;
7430         } else {
7431                 eeor_mode = 0;
7432         }
7433         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7434         /*
7435          * First lets prime the pump. For each destination, if there is room
7436          * in the flight size, attempt to pull an MTU's worth out of the
7437          * stream queues into the general send_queue
7438          */
7439 #ifdef SCTP_AUDITING_ENABLED
7440         sctp_audit_log(0xC2, 2);
7441 #endif
7442         SCTP_TCB_LOCK_ASSERT(stcb);
7443         hbflag = 0;
7444         if ((control_only) || (asoc->stream_reset_outstanding))
7445                 no_data_chunks = 1;
7446         else
7447                 no_data_chunks = 0;
7448
7449         /* Nothing to possible to send? */
7450         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7451             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7452             TAILQ_EMPTY(&asoc->send_queue) &&
7453             TAILQ_EMPTY(&asoc->out_wheel)) {
7454                 *reason_code = 9;
7455                 return (0);
7456         }
7457         if (asoc->peers_rwnd == 0) {
7458                 /* No room in peers rwnd */
7459                 *reason_code = 1;
7460                 if (asoc->total_flight > 0) {
7461                         /* we are allowed one chunk in flight */
7462                         no_data_chunks = 1;
7463                 }
7464         }
7465         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7466         if (stcb->sctp_socket)
7467                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7468         else
7469                 max_send_per_dest = 0;
7470         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7471                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7472                         /*
7473                          * This for loop we are in takes in each net, if
7474                          * its's got space in cwnd and has data sent to it
7475                          * (when CMT is off) then it calls
7476                          * sctp_fill_outqueue for the net. This gets data on
7477                          * the send queue for that network.
7478                          *
7479                          * In sctp_fill_outqueue TSN's are assigned and data is
7480                          * copied out of the stream buffers. Note mostly
7481                          * copy by reference (we hope).
7482                          */
7483                         net->window_probe = 0;
7484                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ||
7485                             (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7486                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7487                                         sctp_log_cwnd(stcb, net, 1,
7488                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7489                                 }
7490                                 continue;
7491                         }
7492                         if ((asoc->sctp_cmt_on_off == 0) &&
7493                             (asoc->primary_destination != net) &&
7494                             (net->ref_count < 2)) {
7495                                 /* nothing can be in queue for this guy */
7496                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7497                                         sctp_log_cwnd(stcb, net, 2,
7498                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7499                                 }
7500                                 continue;
7501                         }
7502                         if (net->flight_size >= net->cwnd) {
7503                                 /* skip this network, no room - can't fill */
7504                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7505                                         sctp_log_cwnd(stcb, net, 3,
7506                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7507                                 }
7508                                 continue;
7509                         }
7510                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7511                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7512                         }
7513                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7514                         if (quit_now) {
7515                                 /* memory alloc failure */
7516                                 no_data_chunks = 1;
7517                                 break;
7518                         }
7519                 }
7520         }
7521         /* now service each destination and send out what we can for it */
7522         /* Nothing to send? */
7523         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7524             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7525             TAILQ_EMPTY(&asoc->send_queue)) {
7526                 *reason_code = 8;
7527                 return (0);
7528         }
7529         if (asoc->sctp_cmt_on_off == 1) {
7530                 /* get the last start point */
7531                 start_at = asoc->last_net_cmt_send_started;
7532                 if (start_at == NULL) {
7533                         /* null so to beginning */
7534                         start_at = TAILQ_FIRST(&asoc->nets);
7535                 } else {
7536                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7537                         if (start_at == NULL) {
7538                                 start_at = TAILQ_FIRST(&asoc->nets);
7539                         }
7540                 }
7541                 asoc->last_net_cmt_send_started = start_at;
7542         } else {
7543                 start_at = TAILQ_FIRST(&asoc->nets);
7544         }
7545         old_start_at = NULL;
7546 again_one_more_time:
7547         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7548                 /* how much can we send? */
7549                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7550                 if (old_start_at && (old_start_at == net)) {
7551                         /* through list ocmpletely. */
7552                         break;
7553                 }
7554                 tsns_sent = 0xa;
7555                 if ((asoc->sctp_cmt_on_off == 0) &&
7556                     (asoc->primary_destination != net) &&
7557                     (net->ref_count < 2)) {
7558                         /*
7559                          * Ref-count of 1 so we cannot have data or control
7560                          * queued to this address. Skip it (non-CMT).
7561                          */
7562                         continue;
7563                 }
7564                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7565                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7566                     (net->flight_size >= net->cwnd)) {
7567                         /*
7568                          * Nothing on control or asconf and flight is full,
7569                          * we can skip even in the CMT case.
7570                          */
7571                         continue;
7572                 }
7573                 ctl_cnt = bundle_at = 0;
7574                 endoutchain = outchain = NULL;
7575                 no_fragmentflg = 1;
7576                 one_chunk = 0;
7577                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7578                         skip_data_for_this_net = 1;
7579                 } else {
7580                         skip_data_for_this_net = 0;
7581                 }
7582                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7583                         /*
7584                          * if we have a route and an ifp check to see if we
7585                          * have room to send to this guy
7586                          */
7587                         struct ifnet *ifp;
7588
7589                         ifp = net->ro.ro_rt->rt_ifp;
7590                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7591                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7592                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7593                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7594                                 }
7595                                 continue;
7596                         }
7597                 }
7598                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7599                 case AF_INET:
7600                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7601                         break;
7602 #ifdef INET6
7603                 case AF_INET6:
7604                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7605                         break;
7606 #endif
7607                 default:
7608                         /* TSNH */
7609                         mtu = net->mtu;
7610                         break;
7611                 }
7612                 mx_mtu = mtu;
7613                 to_out = 0;
7614                 if (mtu > asoc->peers_rwnd) {
7615                         if (asoc->total_flight > 0) {
7616                                 /* We have a packet in flight somewhere */
7617                                 r_mtu = asoc->peers_rwnd;
7618                         } else {
7619                                 /* We are always allowed to send one MTU out */
7620                                 one_chunk = 1;
7621                                 r_mtu = mtu;
7622                         }
7623                 } else {
7624                         r_mtu = mtu;
7625                 }
7626                 /************************/
7627                 /* ASCONF transmission */
7628                 /************************/
7629                 /* Now first lets go through the asconf queue */
7630                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7631                     chk; chk = nchk) {
7632                         nchk = TAILQ_NEXT(chk, sctp_next);
7633                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7634                                 continue;
7635                         }
7636                         if (chk->whoTo != net) {
7637                                 /*
7638                                  * No, not sent to the network we are
7639                                  * looking at
7640                                  */
7641                                 break;
7642                         }
7643                         if (chk->data == NULL) {
7644                                 break;
7645                         }
7646                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7647                             chk->sent != SCTP_DATAGRAM_RESEND) {
7648                                 break;
7649                         }
7650                         /*
7651                          * if no AUTH is yet included and this chunk
7652                          * requires it, make sure to account for it.  We
7653                          * don't apply the size until the AUTH chunk is
7654                          * actually added below in case there is no room for
7655                          * this chunk. NOTE: we overload the use of "omtu"
7656                          * here
7657                          */
7658                         if ((auth == NULL) &&
7659                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7660                             stcb->asoc.peer_auth_chunks)) {
7661                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7662                         } else
7663                                 omtu = 0;
7664                         /* Here we do NOT factor the r_mtu */
7665                         if ((chk->send_size < (int)(mtu - omtu)) ||
7666                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7667                                 /*
7668                                  * We probably should glom the mbuf chain
7669                                  * from the chk->data for control but the
7670                                  * problem is it becomes yet one more level
7671                                  * of tracking to do if for some reason
7672                                  * output fails. Then I have got to
7673                                  * reconstruct the merged control chain.. el
7674                                  * yucko.. for now we take the easy way and
7675                                  * do the copy
7676                                  */
7677                                 /*
7678                                  * Add an AUTH chunk, if chunk requires it
7679                                  * save the offset into the chain for AUTH
7680                                  */
7681                                 if ((auth == NULL) &&
7682                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7683                                     stcb->asoc.peer_auth_chunks))) {
7684                                         outchain = sctp_add_auth_chunk(outchain,
7685                                             &endoutchain,
7686                                             &auth,
7687                                             &auth_offset,
7688                                             stcb,
7689                                             chk->rec.chunk_id.id);
7690                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7691                                 }
7692                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7693                                     (int)chk->rec.chunk_id.can_take_data,
7694                                     chk->send_size, chk->copy_by_ref);
7695                                 if (outchain == NULL) {
7696                                         *reason_code = 8;
7697                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7698                                         return (ENOMEM);
7699                                 }
7700                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7701                                 /* update our MTU size */
7702                                 if (mtu > (chk->send_size + omtu))
7703                                         mtu -= (chk->send_size + omtu);
7704                                 else
7705                                         mtu = 0;
7706                                 to_out += (chk->send_size + omtu);
7707                                 /* Do clear IP_DF ? */
7708                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7709                                         no_fragmentflg = 0;
7710                                 }
7711                                 if (chk->rec.chunk_id.can_take_data)
7712                                         chk->data = NULL;
7713                                 /*
7714                                  * set hb flag since we can use these for
7715                                  * RTO
7716                                  */
7717                                 hbflag = 1;
7718                                 asconf = 1;
7719                                 /*
7720                                  * should sysctl this: don't bundle data
7721                                  * with ASCONF since it requires AUTH
7722                                  */
7723                                 no_data_chunks = 1;
7724                                 chk->sent = SCTP_DATAGRAM_SENT;
7725                                 chk->snd_count++;
7726                                 if (mtu == 0) {
7727                                         /*
7728                                          * Ok we are out of room but we can
7729                                          * output without effecting the
7730                                          * flight size since this little guy
7731                                          * is a control only packet.
7732                                          */
7733                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7734                                         /*
7735                                          * do NOT clear the asconf flag as
7736                                          * it is used to do appropriate
7737                                          * source address selection.
7738                                          */
7739                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7740                                             (struct sockaddr *)&net->ro._l_addr,
7741                                             outchain, auth_offset, auth,
7742                                             stcb->asoc.authinfo.active_keyid,
7743                                             no_fragmentflg, 0, NULL, asconf,
7744                                             inp->sctp_lport, stcb->rport,
7745                                             htonl(stcb->asoc.peer_vtag),
7746                                             net->port, so_locked, NULL))) {
7747                                                 if (error == ENOBUFS) {
7748                                                         asoc->ifp_had_enobuf = 1;
7749                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7750                                                 }
7751                                                 if (from_where == 0) {
7752                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7753                                                 }
7754                                                 if (*now_filled == 0) {
7755                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7756                                                         *now_filled = 1;
7757                                                         *now = net->last_sent_time;
7758                                                 } else {
7759                                                         net->last_sent_time = *now;
7760                                                 }
7761                                                 hbflag = 0;
7762                                                 /* error, could not output */
7763                                                 if (error == EHOSTUNREACH) {
7764                                                         /*
7765                                                          * Destination went
7766                                                          * unreachable
7767                                                          * during this send
7768                                                          */
7769                                                         sctp_move_chunks_from_net(stcb, net);
7770                                                 }
7771                                                 *reason_code = 7;
7772                                                 continue;
7773                                         } else
7774                                                 asoc->ifp_had_enobuf = 0;
7775                                         if (*now_filled == 0) {
7776                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7777                                                 *now_filled = 1;
7778                                                 *now = net->last_sent_time;
7779                                         } else {
7780                                                 net->last_sent_time = *now;
7781                                         }
7782                                         hbflag = 0;
7783                                         /*
7784                                          * increase the number we sent, if a
7785                                          * cookie is sent we don't tell them
7786                                          * any was sent out.
7787                                          */
7788                                         outchain = endoutchain = NULL;
7789                                         auth = NULL;
7790                                         auth_offset = 0;
7791                                         if (!no_out_cnt)
7792                                                 *num_out += ctl_cnt;
7793                                         /* recalc a clean slate and setup */
7794                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7795                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7796                                         } else {
7797                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7798                                         }
7799                                         to_out = 0;
7800                                         no_fragmentflg = 1;
7801                                 }
7802                         }
7803                 }
7804                 /************************/
7805                 /* Control transmission */
7806                 /************************/
7807                 /* Now first lets go through the control queue */
7808                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7809                     chk; chk = nchk) {
7810                         nchk = TAILQ_NEXT(chk, sctp_next);
7811                         if (chk->whoTo != net) {
7812                                 /*
7813                                  * No, not sent to the network we are
7814                                  * looking at
7815                                  */
7816                                 continue;
7817                         }
7818                         if (chk->data == NULL) {
7819                                 continue;
7820                         }
7821                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7822                                 /*
7823                                  * It must be unsent. Cookies and ASCONF's
7824                                  * hang around but there timers will force
7825                                  * when marked for resend.
7826                                  */
7827                                 continue;
7828                         }
7829                         /*
7830                          * if no AUTH is yet included and this chunk
7831                          * requires it, make sure to account for it.  We
7832                          * don't apply the size until the AUTH chunk is
7833                          * actually added below in case there is no room for
7834                          * this chunk. NOTE: we overload the use of "omtu"
7835                          * here
7836                          */
7837                         if ((auth == NULL) &&
7838                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7839                             stcb->asoc.peer_auth_chunks)) {
7840                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7841                         } else
7842                                 omtu = 0;
7843                         /* Here we do NOT factor the r_mtu */
7844                         if ((chk->send_size <= (int)(mtu - omtu)) ||
7845                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7846                                 /*
7847                                  * We probably should glom the mbuf chain
7848                                  * from the chk->data for control but the
7849                                  * problem is it becomes yet one more level
7850                                  * of tracking to do if for some reason
7851                                  * output fails. Then I have got to
7852                                  * reconstruct the merged control chain.. el
7853                                  * yucko.. for now we take the easy way and
7854                                  * do the copy
7855                                  */
7856                                 /*
7857                                  * Add an AUTH chunk, if chunk requires it
7858                                  * save the offset into the chain for AUTH
7859                                  */
7860                                 if ((auth == NULL) &&
7861                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7862                                     stcb->asoc.peer_auth_chunks))) {
7863                                         outchain = sctp_add_auth_chunk(outchain,
7864                                             &endoutchain,
7865                                             &auth,
7866                                             &auth_offset,
7867                                             stcb,
7868                                             chk->rec.chunk_id.id);
7869                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7870                                 }
7871                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7872                                     (int)chk->rec.chunk_id.can_take_data,
7873                                     chk->send_size, chk->copy_by_ref);
7874                                 if (outchain == NULL) {
7875                                         *reason_code = 8;
7876                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7877                                         return (ENOMEM);
7878                                 }
7879                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7880                                 /* update our MTU size */
7881                                 if (mtu > (chk->send_size + omtu))
7882                                         mtu -= (chk->send_size + omtu);
7883                                 else
7884                                         mtu = 0;
7885                                 to_out += (chk->send_size + omtu);
7886                                 /* Do clear IP_DF ? */
7887                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7888                                         no_fragmentflg = 0;
7889                                 }
7890                                 if (chk->rec.chunk_id.can_take_data)
7891                                         chk->data = NULL;
7892                                 /* Mark things to be removed, if needed */
7893                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7894                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7895                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7896                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7897                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7898                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7899                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7900                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7901                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7902                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7903                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7904
7905                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7906                                                 hbflag = 1;
7907                                                 /*
7908                                                  * JRS 5/14/07 - Set the
7909                                                  * flag to say a heartbeat
7910                                                  * is being sent.
7911                                                  */
7912                                                 pf_hbflag = 1;
7913                                         }
7914                                         /* remove these chunks at the end */
7915                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7916                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7917                                                 /* turn off the timer */
7918                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7919                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7920                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7921                                                 }
7922                                         }
7923                                         ctl_cnt++;
7924                                 } else {
7925                                         /*
7926                                          * Other chunks, since they have
7927                                          * timers running (i.e. COOKIE) we
7928                                          * just "trust" that it gets sent or
7929                                          * retransmitted.
7930                                          */
7931                                         ctl_cnt++;
7932                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7933                                                 cookie = 1;
7934                                                 no_out_cnt = 1;
7935                                         }
7936                                         chk->sent = SCTP_DATAGRAM_SENT;
7937                                         chk->snd_count++;
7938                                 }
7939                                 if (mtu == 0) {
7940                                         /*
7941                                          * Ok we are out of room but we can
7942                                          * output without effecting the
7943                                          * flight size since this little guy
7944                                          * is a control only packet.
7945                                          */
7946                                         if (asconf) {
7947                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7948                                                 /*
7949                                                  * do NOT clear the asconf
7950                                                  * flag as it is used to do
7951                                                  * appropriate source
7952                                                  * address selection.
7953                                                  */
7954                                         }
7955                                         if (cookie) {
7956                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7957                                                 cookie = 0;
7958                                         }
7959                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7960                                             (struct sockaddr *)&net->ro._l_addr,
7961                                             outchain,
7962                                             auth_offset, auth,
7963                                             stcb->asoc.authinfo.active_keyid,
7964                                             no_fragmentflg, 0, NULL, asconf,
7965                                             inp->sctp_lport, stcb->rport,
7966                                             htonl(stcb->asoc.peer_vtag),
7967                                             net->port, so_locked, NULL))) {
7968                                                 if (error == ENOBUFS) {
7969                                                         asoc->ifp_had_enobuf = 1;
7970                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7971                                                 }
7972                                                 if (from_where == 0) {
7973                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7974                                                 }
7975                                                 /* error, could not output */
7976                                                 if (hbflag) {
7977                                                         if (*now_filled == 0) {
7978                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7979                                                                 *now_filled = 1;
7980                                                                 *now = net->last_sent_time;
7981                                                         } else {
7982                                                                 net->last_sent_time = *now;
7983                                                         }
7984                                                         hbflag = 0;
7985                                                 }
7986                                                 if (error == EHOSTUNREACH) {
7987                                                         /*
7988                                                          * Destination went
7989                                                          * unreachable
7990                                                          * during this send
7991                                                          */
7992                                                         sctp_move_chunks_from_net(stcb, net);
7993                                                 }
7994                                                 *reason_code = 7;
7995                                                 continue;
7996                                         } else
7997                                                 asoc->ifp_had_enobuf = 0;
7998                                         /* Only HB or ASCONF advances time */
7999                                         if (hbflag) {
8000                                                 if (*now_filled == 0) {
8001                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8002                                                         *now_filled = 1;
8003                                                         *now = net->last_sent_time;
8004                                                 } else {
8005                                                         net->last_sent_time = *now;
8006                                                 }
8007                                                 hbflag = 0;
8008                                         }
8009                                         /*
8010                                          * increase the number we sent, if a
8011                                          * cookie is sent we don't tell them
8012                                          * any was sent out.
8013                                          */
8014                                         outchain = endoutchain = NULL;
8015                                         auth = NULL;
8016                                         auth_offset = 0;
8017                                         if (!no_out_cnt)
8018                                                 *num_out += ctl_cnt;
8019                                         /* recalc a clean slate and setup */
8020                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8021                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8022                                         } else {
8023                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8024                                         }
8025                                         to_out = 0;
8026                                         no_fragmentflg = 1;
8027                                 }
8028                         }
8029                 }
8030                 /* JRI: if dest is in PF state, do not send data to it */
8031                 if ((asoc->sctp_cmt_on_off == 1) &&
8032                     (asoc->sctp_cmt_pf > 0) &&
8033                     (net->dest_state & SCTP_ADDR_PF)) {
8034                         goto no_data_fill;
8035                 }
8036                 if (net->flight_size >= net->cwnd) {
8037                         goto no_data_fill;
8038                 }
8039                 if ((asoc->sctp_cmt_on_off == 1) &&
8040                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8041                     (net->flight_size > max_rwnd_per_dest)) {
8042                         goto no_data_fill;
8043                 }
8044                 /*
8045                  * We need a specific accounting for the usage of the send
8046                  * buffer. We also need to check the number of messages per
8047                  * net. For now, this is better than nothing and it disabled
8048                  * by default...
8049                  */
8050                 if ((asoc->sctp_cmt_on_off == 1) &&
8051                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8052                     (max_send_per_dest > 0) &&
8053                     (net->flight_size > max_send_per_dest)) {
8054                         goto no_data_fill;
8055                 }
8056                 /*********************/
8057                 /* Data transmission */
8058                 /*********************/
8059                 /*
8060                  * if AUTH for DATA is required and no AUTH has been added
8061                  * yet, account for this in the mtu now... if no data can be
8062                  * bundled, this adjustment won't matter anyways since the
8063                  * packet will be going out...
8064                  */
8065                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8066                     stcb->asoc.peer_auth_chunks);
8067                 if (data_auth_reqd && (auth == NULL)) {
8068                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8069                 }
8070                 /* now lets add any data within the MTU constraints */
8071                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8072                 case AF_INET:
8073                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8074                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8075                         else
8076                                 omtu = 0;
8077                         break;
8078 #ifdef INET6
8079                 case AF_INET6:
8080                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8081                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8082                         else
8083                                 omtu = 0;
8084                         break;
8085 #endif
8086                 default:
8087                         /* TSNH */
8088                         omtu = 0;
8089                         break;
8090                 }
8091                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8092                     (skip_data_for_this_net == 0)) ||
8093                     (cookie)) {
8094                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8095                                 if (no_data_chunks) {
8096                                         /* let only control go out */
8097                                         *reason_code = 1;
8098                                         break;
8099                                 }
8100                                 if (net->flight_size >= net->cwnd) {
8101                                         /* skip this net, no room for data */
8102                                         *reason_code = 2;
8103                                         break;
8104                                 }
8105                                 nchk = TAILQ_NEXT(chk, sctp_next);
8106                                 if ((chk->whoTo != NULL) &&
8107                                     (chk->whoTo != net)) {
8108                                         /* Don't send the chunk on this net */
8109                                         continue;
8110                                 }
8111                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8112                                         /*-
8113                                          * strange, we have a chunk that is
8114                                          * to big for its destination and
8115                                          * yet no fragment ok flag.
8116                                          * Something went wrong when the
8117                                          * PMTU changed...we did not mark
8118                                          * this chunk for some reason?? I
8119                                          * will fix it here by letting IP
8120                                          * fragment it for now and printing
8121                                          * a warning. This really should not
8122                                          * happen ...
8123                                          */
8124                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8125                                             chk->send_size, mtu);
8126                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8127                                 }
8128                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8129                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8130                                         struct sctp_data_chunk *dchkh;
8131
8132                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8133                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8134                                 }
8135                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8136                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8137                                         /* ok we will add this one */
8138
8139                                         /*
8140                                          * Add an AUTH chunk, if chunk
8141                                          * requires it, save the offset into
8142                                          * the chain for AUTH
8143                                          */
8144                                         if (data_auth_reqd) {
8145                                                 if (auth == NULL) {
8146                                                         outchain = sctp_add_auth_chunk(outchain,
8147                                                             &endoutchain,
8148                                                             &auth,
8149                                                             &auth_offset,
8150                                                             stcb,
8151                                                             SCTP_DATA);
8152                                                         auth_keyid = chk->auth_keyid;
8153                                                         override_ok = 0;
8154                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8155                                                 } else if (override_ok) {
8156                                                         /*
8157                                                          * use this data's
8158                                                          * keyid
8159                                                          */
8160                                                         auth_keyid = chk->auth_keyid;
8161                                                         override_ok = 0;
8162                                                 } else if (auth_keyid != chk->auth_keyid) {
8163                                                         /*
8164                                                          * different keyid,
8165                                                          * so done bundling
8166                                                          */
8167                                                         break;
8168                                                 }
8169                                         }
8170                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8171                                             chk->send_size, chk->copy_by_ref);
8172                                         if (outchain == NULL) {
8173                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8174                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8175                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8176                                                 }
8177                                                 *reason_code = 3;
8178                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8179                                                 return (ENOMEM);
8180                                         }
8181                                         /* upate our MTU size */
8182                                         /* Do clear IP_DF ? */
8183                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8184                                                 no_fragmentflg = 0;
8185                                         }
8186                                         /* unsigned subtraction of mtu */
8187                                         if (mtu > chk->send_size)
8188                                                 mtu -= chk->send_size;
8189                                         else
8190                                                 mtu = 0;
8191                                         /* unsigned subtraction of r_mtu */
8192                                         if (r_mtu > chk->send_size)
8193                                                 r_mtu -= chk->send_size;
8194                                         else
8195                                                 r_mtu = 0;
8196
8197                                         to_out += chk->send_size;
8198                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8199 #ifdef INVARIANTS
8200                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8201 #else
8202                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8203                                                     mx_mtu, to_out);
8204 #endif
8205                                         }
8206                                         chk->window_probe = 0;
8207                                         data_list[bundle_at++] = chk;
8208                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8209                                                 mtu = 0;
8210                                                 break;
8211                                         }
8212                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8213                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8214                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8215                                                 } else {
8216                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8217                                                 }
8218                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8219                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8220                                                         /*
8221                                                          * Count number of
8222                                                          * user msg's that
8223                                                          * were fragmented
8224                                                          * we do this by
8225                                                          * counting when we
8226                                                          * see a LAST
8227                                                          * fragment only.
8228                                                          */
8229                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8230                                         }
8231                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8232                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8233                                                         data_list[0]->window_probe = 1;
8234                                                         net->window_probe = 1;
8235                                                 }
8236                                                 break;
8237                                         }
8238                                 } else {
8239                                         /*
8240                                          * Must be sent in order of the
8241                                          * TSN's (on a network)
8242                                          */
8243                                         break;
8244                                 }
8245                         }       /* for (chunk gather loop for this net) */
8246                 }               /* if asoc.state OPEN */
8247 no_data_fill:
8248                 /* Is there something to send for this destination? */
8249                 if (outchain) {
8250                         /* We may need to start a control timer or two */
8251                         if (asconf) {
8252                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8253                                     stcb, net);
8254                                 /*
8255                                  * do NOT clear the asconf flag as it is
8256                                  * used to do appropriate source address
8257                                  * selection.
8258                                  */
8259                         }
8260                         if (cookie) {
8261                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8262                                 cookie = 0;
8263                         }
8264                         /* must start a send timer if data is being sent */
8265                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8266                                 /*
8267                                  * no timer running on this destination
8268                                  * restart it.
8269                                  */
8270                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8271                         } else if ((asoc->sctp_cmt_on_off == 1) &&
8272                                     (asoc->sctp_cmt_pf > 0) &&
8273                                     pf_hbflag &&
8274                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8275                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8276                                 /*
8277                                  * JRS 5/14/07 - If a HB has been sent to a
8278                                  * PF destination and no T3 timer is
8279                                  * currently running, start the T3 timer to
8280                                  * track the HBs that were sent.
8281                                  */
8282                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8283                         }
8284                         /* Now send it, if there is anything to send :> */
8285                         if ((error = sctp_lowlevel_chunk_output(inp,
8286                             stcb,
8287                             net,
8288                             (struct sockaddr *)&net->ro._l_addr,
8289                             outchain,
8290                             auth_offset,
8291                             auth,
8292                             auth_keyid,
8293                             no_fragmentflg,
8294                             bundle_at,
8295                             data_list[0],
8296                             asconf,
8297                             inp->sctp_lport, stcb->rport,
8298                             htonl(stcb->asoc.peer_vtag),
8299                             net->port, so_locked, NULL))) {
8300                                 /* error, we could not output */
8301                                 if (error == ENOBUFS) {
8302                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8303                                         asoc->ifp_had_enobuf = 1;
8304                                 }
8305                                 if (from_where == 0) {
8306                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8307                                 }
8308                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8309                                 if (hbflag) {
8310                                         if (*now_filled == 0) {
8311                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8312                                                 *now_filled = 1;
8313                                                 *now = net->last_sent_time;
8314                                         } else {
8315                                                 net->last_sent_time = *now;
8316                                         }
8317                                         hbflag = 0;
8318                                 }
8319                                 if (error == EHOSTUNREACH) {
8320                                         /*
8321                                          * Destination went unreachable
8322                                          * during this send
8323                                          */
8324                                         sctp_move_chunks_from_net(stcb, net);
8325                                 }
8326                                 *reason_code = 6;
8327                                 /*-
8328                                  * I add this line to be paranoid. As far as
8329                                  * I can tell the continue, takes us back to
8330                                  * the top of the for, but just to make sure
8331                                  * I will reset these again here.
8332                                  */
8333                                 ctl_cnt = bundle_at = 0;
8334                                 continue;       /* This takes us back to the
8335                                                  * for() for the nets. */
8336                         } else {
8337                                 asoc->ifp_had_enobuf = 0;
8338                         }
8339                         outchain = endoutchain = NULL;
8340                         auth = NULL;
8341                         auth_offset = 0;
8342                         if (bundle_at || hbflag) {
8343                                 /* For data/asconf and hb set time */
8344                                 if (*now_filled == 0) {
8345                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8346                                         *now_filled = 1;
8347                                         *now = net->last_sent_time;
8348                                 } else {
8349                                         net->last_sent_time = *now;
8350                                 }
8351                         }
8352                         if (!no_out_cnt) {
8353                                 *num_out += (ctl_cnt + bundle_at);
8354                         }
8355                         if (bundle_at) {
8356                                 /* setup for a RTO measurement */
8357                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8358                                 /* fill time if not already filled */
8359                                 if (*now_filled == 0) {
8360                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8361                                         *now_filled = 1;
8362                                         *now = asoc->time_last_sent;
8363                                 } else {
8364                                         asoc->time_last_sent = *now;
8365                                 }
8366                                 data_list[0]->do_rtt = 1;
8367                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8368                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8369                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8370                                         if (net->flight_size < net->cwnd) {
8371                                                 /* start or restart it */
8372                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8373                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8374                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8375                                                 }
8376                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8377                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8378                                         } else {
8379                                                 /* stop it if its running */
8380                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8381                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8382                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8383                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8384                                                 }
8385                                         }
8386                                 }
8387                         }
8388                         if (one_chunk) {
8389                                 break;
8390                         }
8391                 }
8392                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8393                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8394                 }
8395         }
8396         if (old_start_at == NULL) {
8397                 old_start_at = start_at;
8398                 start_at = TAILQ_FIRST(&asoc->nets);
8399                 if (old_start_at)
8400                         goto again_one_more_time;
8401         }
8402         /*
8403          * At the end there should be no NON timed chunks hanging on this
8404          * queue.
8405          */
8406         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8407                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8408         }
8409         if ((*num_out == 0) && (*reason_code == 0)) {
8410                 *reason_code = 4;
8411         } else {
8412                 *reason_code = 5;
8413         }
8414         sctp_clean_up_ctl(stcb, asoc);
8415         return (0);
8416 }
8417
8418 void
8419 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8420 {
8421         /*-
8422          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8423          * the control chunk queue.
8424          */
8425         struct sctp_chunkhdr *hdr;
8426         struct sctp_tmit_chunk *chk;
8427         struct mbuf *mat;
8428
8429         SCTP_TCB_LOCK_ASSERT(stcb);
8430         sctp_alloc_a_chunk(stcb, chk);
8431         if (chk == NULL) {
8432                 /* no memory */
8433                 sctp_m_freem(op_err);
8434                 return;
8435         }
8436         chk->copy_by_ref = 0;
8437         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8438         if (op_err == NULL) {
8439                 sctp_free_a_chunk(stcb, chk);
8440                 return;
8441         }
8442         chk->send_size = 0;
8443         mat = op_err;
8444         while (mat != NULL) {
8445                 chk->send_size += SCTP_BUF_LEN(mat);
8446                 mat = SCTP_BUF_NEXT(mat);
8447         }
8448         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8449         chk->rec.chunk_id.can_take_data = 1;
8450         chk->sent = SCTP_DATAGRAM_UNSENT;
8451         chk->snd_count = 0;
8452         chk->flags = 0;
8453         chk->asoc = &stcb->asoc;
8454         chk->data = op_err;
8455         chk->whoTo = chk->asoc->primary_destination;
8456         atomic_add_int(&chk->whoTo->ref_count, 1);
8457         hdr = mtod(op_err, struct sctp_chunkhdr *);
8458         hdr->chunk_type = SCTP_OPERATION_ERROR;
8459         hdr->chunk_flags = 0;
8460         hdr->chunk_length = htons(chk->send_size);
8461         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8462             chk,
8463             sctp_next);
8464         chk->asoc->ctrl_queue_cnt++;
8465 }
8466
8467 int
8468 sctp_send_cookie_echo(struct mbuf *m,
8469     int offset,
8470     struct sctp_tcb *stcb,
8471     struct sctp_nets *net)
8472 {
8473         /*-
8474          * pull out the cookie and put it at the front of the control chunk
8475          * queue.
8476          */
8477         int at;
8478         struct mbuf *cookie;
8479         struct sctp_paramhdr parm, *phdr;
8480         struct sctp_chunkhdr *hdr;
8481         struct sctp_tmit_chunk *chk;
8482         uint16_t ptype, plen;
8483
8484         /* First find the cookie in the param area */
8485         cookie = NULL;
8486         at = offset + sizeof(struct sctp_init_chunk);
8487
8488         SCTP_TCB_LOCK_ASSERT(stcb);
8489         do {
8490                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8491                 if (phdr == NULL) {
8492                         return (-3);
8493                 }
8494                 ptype = ntohs(phdr->param_type);
8495                 plen = ntohs(phdr->param_length);
8496                 if (ptype == SCTP_STATE_COOKIE) {
8497                         int pad;
8498
8499                         /* found the cookie */
8500                         if ((pad = (plen % 4))) {
8501                                 plen += 4 - pad;
8502                         }
8503                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8504                         if (cookie == NULL) {
8505                                 /* No memory */
8506                                 return (-2);
8507                         }
8508 #ifdef SCTP_MBUF_LOGGING
8509                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8510                                 struct mbuf *mat;
8511
8512                                 mat = cookie;
8513                                 while (mat) {
8514                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8515                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8516                                         }
8517                                         mat = SCTP_BUF_NEXT(mat);
8518                                 }
8519                         }
8520 #endif
8521                         break;
8522                 }
8523                 at += SCTP_SIZE32(plen);
8524         } while (phdr);
8525         if (cookie == NULL) {
8526                 /* Did not find the cookie */
8527                 return (-3);
8528         }
8529         /* ok, we got the cookie lets change it into a cookie echo chunk */
8530
8531         /* first the change from param to cookie */
8532         hdr = mtod(cookie, struct sctp_chunkhdr *);
8533         hdr->chunk_type = SCTP_COOKIE_ECHO;
8534         hdr->chunk_flags = 0;
8535         /* get the chunk stuff now and place it in the FRONT of the queue */
8536         sctp_alloc_a_chunk(stcb, chk);
8537         if (chk == NULL) {
8538                 /* no memory */
8539                 sctp_m_freem(cookie);
8540                 return (-5);
8541         }
8542         chk->copy_by_ref = 0;
8543         chk->send_size = plen;
8544         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8545         chk->rec.chunk_id.can_take_data = 0;
8546         chk->sent = SCTP_DATAGRAM_UNSENT;
8547         chk->snd_count = 0;
8548         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8549         chk->asoc = &stcb->asoc;
8550         chk->data = cookie;
8551         chk->whoTo = chk->asoc->primary_destination;
8552         atomic_add_int(&chk->whoTo->ref_count, 1);
8553         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8554         chk->asoc->ctrl_queue_cnt++;
8555         return (0);
8556 }
8557
8558 void
8559 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8560     struct mbuf *m,
8561     int offset,
8562     int chk_length,
8563     struct sctp_nets *net)
8564 {
8565         /*
8566          * take a HB request and make it into a HB ack and send it.
8567          */
8568         struct mbuf *outchain;
8569         struct sctp_chunkhdr *chdr;
8570         struct sctp_tmit_chunk *chk;
8571
8572
8573         if (net == NULL)
8574                 /* must have a net pointer */
8575                 return;
8576
8577         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8578         if (outchain == NULL) {
8579                 /* gak out of memory */
8580                 return;
8581         }
8582 #ifdef SCTP_MBUF_LOGGING
8583         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8584                 struct mbuf *mat;
8585
8586                 mat = outchain;
8587                 while (mat) {
8588                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8589                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8590                         }
8591                         mat = SCTP_BUF_NEXT(mat);
8592                 }
8593         }
8594 #endif
8595         chdr = mtod(outchain, struct sctp_chunkhdr *);
8596         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8597         chdr->chunk_flags = 0;
8598         if (chk_length % 4) {
8599                 /* need pad */
8600                 uint32_t cpthis = 0;
8601                 int padlen;
8602
8603                 padlen = 4 - (chk_length % 4);
8604                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8605         }
8606         sctp_alloc_a_chunk(stcb, chk);
8607         if (chk == NULL) {
8608                 /* no memory */
8609                 sctp_m_freem(outchain);
8610                 return;
8611         }
8612         chk->copy_by_ref = 0;
8613         chk->send_size = chk_length;
8614         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8615         chk->rec.chunk_id.can_take_data = 1;
8616         chk->sent = SCTP_DATAGRAM_UNSENT;
8617         chk->snd_count = 0;
8618         chk->flags = 0;
8619         chk->asoc = &stcb->asoc;
8620         chk->data = outchain;
8621         chk->whoTo = net;
8622         atomic_add_int(&chk->whoTo->ref_count, 1);
8623         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8624         chk->asoc->ctrl_queue_cnt++;
8625 }
8626
8627 void
8628 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8629 {
8630         /* formulate and queue a cookie-ack back to sender */
8631         struct mbuf *cookie_ack;
8632         struct sctp_chunkhdr *hdr;
8633         struct sctp_tmit_chunk *chk;
8634
8635         cookie_ack = NULL;
8636         SCTP_TCB_LOCK_ASSERT(stcb);
8637
8638         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8639         if (cookie_ack == NULL) {
8640                 /* no mbuf's */
8641                 return;
8642         }
8643         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8644         sctp_alloc_a_chunk(stcb, chk);
8645         if (chk == NULL) {
8646                 /* no memory */
8647                 sctp_m_freem(cookie_ack);
8648                 return;
8649         }
8650         chk->copy_by_ref = 0;
8651         chk->send_size = sizeof(struct sctp_chunkhdr);
8652         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8653         chk->rec.chunk_id.can_take_data = 1;
8654         chk->sent = SCTP_DATAGRAM_UNSENT;
8655         chk->snd_count = 0;
8656         chk->flags = 0;
8657         chk->asoc = &stcb->asoc;
8658         chk->data = cookie_ack;
8659         if (chk->asoc->last_control_chunk_from != NULL) {
8660                 chk->whoTo = chk->asoc->last_control_chunk_from;
8661         } else {
8662                 chk->whoTo = chk->asoc->primary_destination;
8663         }
8664         atomic_add_int(&chk->whoTo->ref_count, 1);
8665         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8666         hdr->chunk_type = SCTP_COOKIE_ACK;
8667         hdr->chunk_flags = 0;
8668         hdr->chunk_length = htons(chk->send_size);
8669         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8670         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8671         chk->asoc->ctrl_queue_cnt++;
8672         return;
8673 }
8674
8675
8676 void
8677 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8678 {
8679         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8680         struct mbuf *m_shutdown_ack;
8681         struct sctp_shutdown_ack_chunk *ack_cp;
8682         struct sctp_tmit_chunk *chk;
8683
8684         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8685         if (m_shutdown_ack == NULL) {
8686                 /* no mbuf's */
8687                 return;
8688         }
8689         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8690         sctp_alloc_a_chunk(stcb, chk);
8691         if (chk == NULL) {
8692                 /* no memory */
8693                 sctp_m_freem(m_shutdown_ack);
8694                 return;
8695         }
8696         chk->copy_by_ref = 0;
8697         chk->send_size = sizeof(struct sctp_chunkhdr);
8698         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8699         chk->rec.chunk_id.can_take_data = 1;
8700         chk->sent = SCTP_DATAGRAM_UNSENT;
8701         chk->snd_count = 0;
8702         chk->flags = 0;
8703         chk->asoc = &stcb->asoc;
8704         chk->data = m_shutdown_ack;
8705         chk->whoTo = net;
8706         atomic_add_int(&net->ref_count, 1);
8707
8708         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8709         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8710         ack_cp->ch.chunk_flags = 0;
8711         ack_cp->ch.chunk_length = htons(chk->send_size);
8712         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8713         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8714         chk->asoc->ctrl_queue_cnt++;
8715         return;
8716 }
8717
8718 void
8719 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8720 {
8721         /* formulate and queue a SHUTDOWN to the sender */
8722         struct mbuf *m_shutdown;
8723         struct sctp_shutdown_chunk *shutdown_cp;
8724         struct sctp_tmit_chunk *chk;
8725
8726         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8727         if (m_shutdown == NULL) {
8728                 /* no mbuf's */
8729                 return;
8730         }
8731         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8732         sctp_alloc_a_chunk(stcb, chk);
8733         if (chk == NULL) {
8734                 /* no memory */
8735                 sctp_m_freem(m_shutdown);
8736                 return;
8737         }
8738         chk->copy_by_ref = 0;
8739         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8740         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8741         chk->rec.chunk_id.can_take_data = 1;
8742         chk->sent = SCTP_DATAGRAM_UNSENT;
8743         chk->snd_count = 0;
8744         chk->flags = 0;
8745         chk->asoc = &stcb->asoc;
8746         chk->data = m_shutdown;
8747         chk->whoTo = net;
8748         atomic_add_int(&net->ref_count, 1);
8749
8750         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8751         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8752         shutdown_cp->ch.chunk_flags = 0;
8753         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8754         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8755         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8756         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8757         chk->asoc->ctrl_queue_cnt++;
8758         return;
8759 }
8760
8761 void
8762 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8763 {
8764         /*
8765          * formulate and queue an ASCONF to the peer. ASCONF parameters
8766          * should be queued on the assoc queue.
8767          */
8768         struct sctp_tmit_chunk *chk;
8769         struct mbuf *m_asconf;
8770         int len;
8771
8772         SCTP_TCB_LOCK_ASSERT(stcb);
8773
8774         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8775             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8776                 /* can't send a new one if there is one in flight already */
8777                 return;
8778         }
8779         /* compose an ASCONF chunk, maximum length is PMTU */
8780         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8781         if (m_asconf == NULL) {
8782                 return;
8783         }
8784         sctp_alloc_a_chunk(stcb, chk);
8785         if (chk == NULL) {
8786                 /* no memory */
8787                 sctp_m_freem(m_asconf);
8788                 return;
8789         }
8790         chk->copy_by_ref = 0;
8791         chk->data = m_asconf;
8792         chk->send_size = len;
8793         chk->rec.chunk_id.id = SCTP_ASCONF;
8794         chk->rec.chunk_id.can_take_data = 0;
8795         chk->sent = SCTP_DATAGRAM_UNSENT;
8796         chk->snd_count = 0;
8797         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8798         chk->asoc = &stcb->asoc;
8799         chk->whoTo = net;
8800         atomic_add_int(&chk->whoTo->ref_count, 1);
8801         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8802         chk->asoc->ctrl_queue_cnt++;
8803         return;
8804 }
8805
8806 void
8807 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8808 {
8809         /*
8810          * formulate and queue a asconf-ack back to sender. the asconf-ack
8811          * must be stored in the tcb.
8812          */
8813         struct sctp_tmit_chunk *chk;
8814         struct sctp_asconf_ack *ack, *latest_ack;
8815         struct mbuf *m_ack, *m;
8816         struct sctp_nets *net = NULL;
8817
8818         SCTP_TCB_LOCK_ASSERT(stcb);
8819         /* Get the latest ASCONF-ACK */
8820         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8821         if (latest_ack == NULL) {
8822                 return;
8823         }
8824         if (latest_ack->last_sent_to != NULL &&
8825             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8826                 /* we're doing a retransmission */
8827                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8828                 if (net == NULL) {
8829                         /* no alternate */
8830                         if (stcb->asoc.last_control_chunk_from == NULL)
8831                                 net = stcb->asoc.primary_destination;
8832                         else
8833                                 net = stcb->asoc.last_control_chunk_from;
8834                 }
8835         } else {
8836                 /* normal case */
8837                 if (stcb->asoc.last_control_chunk_from == NULL)
8838                         net = stcb->asoc.primary_destination;
8839                 else
8840                         net = stcb->asoc.last_control_chunk_from;
8841         }
8842         latest_ack->last_sent_to = net;
8843
8844         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8845                 if (ack->data == NULL) {
8846                         continue;
8847                 }
8848                 /* copy the asconf_ack */
8849                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8850                 if (m_ack == NULL) {
8851                         /* couldn't copy it */
8852                         return;
8853                 }
8854 #ifdef SCTP_MBUF_LOGGING
8855                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8856                         struct mbuf *mat;
8857
8858                         mat = m_ack;
8859                         while (mat) {
8860                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8861                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8862                                 }
8863                                 mat = SCTP_BUF_NEXT(mat);
8864                         }
8865                 }
8866 #endif
8867
8868                 sctp_alloc_a_chunk(stcb, chk);
8869                 if (chk == NULL) {
8870                         /* no memory */
8871                         if (m_ack)
8872                                 sctp_m_freem(m_ack);
8873                         return;
8874                 }
8875                 chk->copy_by_ref = 0;
8876
8877                 chk->whoTo = net;
8878                 chk->data = m_ack;
8879                 chk->send_size = 0;
8880                 /* Get size */
8881                 m = m_ack;
8882                 chk->send_size = ack->len;
8883                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8884                 chk->rec.chunk_id.can_take_data = 1;
8885                 chk->sent = SCTP_DATAGRAM_UNSENT;
8886                 chk->snd_count = 0;
8887                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8888                 chk->asoc = &stcb->asoc;
8889                 atomic_add_int(&chk->whoTo->ref_count, 1);
8890
8891                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8892                 chk->asoc->ctrl_queue_cnt++;
8893         }
8894         return;
8895 }
8896
8897
8898 static int
8899 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8900     struct sctp_tcb *stcb,
8901     struct sctp_association *asoc,
8902     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8903 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8904     SCTP_UNUSED
8905 #endif
8906 )
8907 {
8908         /*-
8909          * send out one MTU of retransmission. If fast_retransmit is
8910          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8911          * rwnd. For a Cookie or Asconf in the control chunk queue we
8912          * retransmit them by themselves.
8913          *
8914          * For data chunks we will pick out the lowest TSN's in the sent_queue
8915          * marked for resend and bundle them all together (up to a MTU of
8916          * destination). The address to send to should have been
8917          * selected/changed where the retransmission was marked (i.e. in FR
8918          * or t3-timeout routines).
8919          */
8920         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8921         struct sctp_tmit_chunk *chk, *fwd;
8922         struct mbuf *m, *endofchain;
8923         struct sctp_nets *net = NULL;
8924         uint32_t tsns_sent = 0;
8925         int no_fragmentflg, bundle_at, cnt_thru;
8926         unsigned int mtu;
8927         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8928         struct sctp_auth_chunk *auth = NULL;
8929         uint32_t auth_offset = 0;
8930         uint16_t auth_keyid;
8931         int override_ok = 1;
8932         int data_auth_reqd = 0;
8933         uint32_t dmtu = 0;
8934
8935         SCTP_TCB_LOCK_ASSERT(stcb);
8936         tmr_started = ctl_cnt = bundle_at = error = 0;
8937         no_fragmentflg = 1;
8938         fwd_tsn = 0;
8939         *cnt_out = 0;
8940         fwd = NULL;
8941         endofchain = m = NULL;
8942         auth_keyid = stcb->asoc.authinfo.active_keyid;
8943 #ifdef SCTP_AUDITING_ENABLED
8944         sctp_audit_log(0xC3, 1);
8945 #endif
8946         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8947             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8948                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8949                     asoc->sent_queue_retran_cnt);
8950                 asoc->sent_queue_cnt = 0;
8951                 asoc->sent_queue_cnt_removeable = 0;
8952                 /* send back 0/0 so we enter normal transmission */
8953                 *cnt_out = 0;
8954                 return (0);
8955         }
8956         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8957                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8958                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8959                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8960                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8961                                 continue;
8962                         }
8963                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8964                                 if (chk != asoc->str_reset) {
8965                                         /*
8966                                          * not eligible for retran if its
8967                                          * not ours
8968                                          */
8969                                         continue;
8970                                 }
8971                         }
8972                         ctl_cnt++;
8973                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8974                                 fwd_tsn = 1;
8975                                 fwd = chk;
8976                         }
8977                         /*
8978                          * Add an AUTH chunk, if chunk requires it save the
8979                          * offset into the chain for AUTH
8980                          */
8981                         if ((auth == NULL) &&
8982                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8983                             stcb->asoc.peer_auth_chunks))) {
8984                                 m = sctp_add_auth_chunk(m, &endofchain,
8985                                     &auth, &auth_offset,
8986                                     stcb,
8987                                     chk->rec.chunk_id.id);
8988                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8989                         }
8990                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8991                         break;
8992                 }
8993         }
8994         one_chunk = 0;
8995         cnt_thru = 0;
8996         /* do we have control chunks to retransmit? */
8997         if (m != NULL) {
8998                 /* Start a timer no matter if we suceed or fail */
8999                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9000                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9001                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9002                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9003                 chk->snd_count++;       /* update our count */
9004                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9005                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9006                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9007                     no_fragmentflg, 0, NULL, 0,
9008                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9009                     chk->whoTo->port, so_locked, NULL))) {
9010                         SCTP_STAT_INCR(sctps_lowlevelerr);
9011                         return (error);
9012                 }
9013                 m = endofchain = NULL;
9014                 auth = NULL;
9015                 auth_offset = 0;
9016                 /*
9017                  * We don't want to mark the net->sent time here since this
9018                  * we use this for HB and retrans cannot measure RTT
9019                  */
9020                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9021                 *cnt_out += 1;
9022                 chk->sent = SCTP_DATAGRAM_SENT;
9023                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9024                 if (fwd_tsn == 0) {
9025                         return (0);
9026                 } else {
9027                         /* Clean up the fwd-tsn list */
9028                         sctp_clean_up_ctl(stcb, asoc);
9029                         return (0);
9030                 }
9031         }
9032         /*
9033          * Ok, it is just data retransmission we need to do or that and a
9034          * fwd-tsn with it all.
9035          */
9036         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9037                 return (SCTP_RETRAN_DONE);
9038         }
9039         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9040             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9041                 /* not yet open, resend the cookie and that is it */
9042                 return (1);
9043         }
9044 #ifdef SCTP_AUDITING_ENABLED
9045         sctp_auditing(20, inp, stcb, NULL);
9046 #endif
9047         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9048         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9049                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9050                         /* No, not sent to this net or not ready for rtx */
9051                         continue;
9052                 }
9053                 if (chk->data == NULL) {
9054                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9055                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9056                         continue;
9057                 }
9058                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9059                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9060                         /* Gak, we have exceeded max unlucky retran, abort! */
9061                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9062                             chk->snd_count,
9063                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9064                         atomic_add_int(&stcb->asoc.refcnt, 1);
9065                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9066                         SCTP_TCB_LOCK(stcb);
9067                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9068                         return (SCTP_RETRAN_EXIT);
9069                 }
9070                 /* pick up the net */
9071                 net = chk->whoTo;
9072                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9073                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9074                 } else {
9075                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9076                 }
9077
9078                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9079                         /* No room in peers rwnd */
9080                         uint32_t tsn;
9081
9082                         tsn = asoc->last_acked_seq + 1;
9083                         if (tsn == chk->rec.data.TSN_seq) {
9084                                 /*
9085                                  * we make a special exception for this
9086                                  * case. The peer has no rwnd but is missing
9087                                  * the lowest chunk.. which is probably what
9088                                  * is holding up the rwnd.
9089                                  */
9090                                 goto one_chunk_around;
9091                         }
9092                         return (1);
9093                 }
9094 one_chunk_around:
9095                 if (asoc->peers_rwnd < mtu) {
9096                         one_chunk = 1;
9097                         if ((asoc->peers_rwnd == 0) &&
9098                             (asoc->total_flight == 0)) {
9099                                 chk->window_probe = 1;
9100                                 chk->whoTo->window_probe = 1;
9101                         }
9102                 }
9103 #ifdef SCTP_AUDITING_ENABLED
9104                 sctp_audit_log(0xC3, 2);
9105 #endif
9106                 bundle_at = 0;
9107                 m = NULL;
9108                 net->fast_retran_ip = 0;
9109                 if (chk->rec.data.doing_fast_retransmit == 0) {
9110                         /*
9111                          * if no FR in progress skip destination that have
9112                          * flight_size > cwnd.
9113                          */
9114                         if (net->flight_size >= net->cwnd) {
9115                                 continue;
9116                         }
9117                 } else {
9118                         /*
9119                          * Mark the destination net to have FR recovery
9120                          * limits put on it.
9121                          */
9122                         *fr_done = 1;
9123                         net->fast_retran_ip = 1;
9124                 }
9125
9126                 /*
9127                  * if no AUTH is yet included and this chunk requires it,
9128                  * make sure to account for it.  We don't apply the size
9129                  * until the AUTH chunk is actually added below in case
9130                  * there is no room for this chunk.
9131                  */
9132                 if (data_auth_reqd && (auth == NULL)) {
9133                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9134                 } else
9135                         dmtu = 0;
9136
9137                 if ((chk->send_size <= (mtu - dmtu)) ||
9138                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9139                         /* ok we will add this one */
9140                         if (data_auth_reqd) {
9141                                 if (auth == NULL) {
9142                                         m = sctp_add_auth_chunk(m,
9143                                             &endofchain,
9144                                             &auth,
9145                                             &auth_offset,
9146                                             stcb,
9147                                             SCTP_DATA);
9148                                         auth_keyid = chk->auth_keyid;
9149                                         override_ok = 0;
9150                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9151                                 } else if (override_ok) {
9152                                         auth_keyid = chk->auth_keyid;
9153                                         override_ok = 0;
9154                                 } else if (chk->auth_keyid != auth_keyid) {
9155                                         /* different keyid, so done bundling */
9156                                         break;
9157                                 }
9158                         }
9159                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9160                         if (m == NULL) {
9161                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9162                                 return (ENOMEM);
9163                         }
9164                         /* Do clear IP_DF ? */
9165                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9166                                 no_fragmentflg = 0;
9167                         }
9168                         /* upate our MTU size */
9169                         if (mtu > (chk->send_size + dmtu))
9170                                 mtu -= (chk->send_size + dmtu);
9171                         else
9172                                 mtu = 0;
9173                         data_list[bundle_at++] = chk;
9174                         if (one_chunk && (asoc->total_flight <= 0)) {
9175                                 SCTP_STAT_INCR(sctps_windowprobed);
9176                         }
9177                 }
9178                 if (one_chunk == 0) {
9179                         /*
9180                          * now are there anymore forward from chk to pick
9181                          * up?
9182                          */
9183                         fwd = TAILQ_NEXT(chk, sctp_next);
9184                         while (fwd) {
9185                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9186                                         /* Nope, not for retran */
9187                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9188                                         continue;
9189                                 }
9190                                 if (fwd->whoTo != net) {
9191                                         /* Nope, not the net in question */
9192                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9193                                         continue;
9194                                 }
9195                                 if (data_auth_reqd && (auth == NULL)) {
9196                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9197                                 } else
9198                                         dmtu = 0;
9199                                 if (fwd->send_size <= (mtu - dmtu)) {
9200                                         if (data_auth_reqd) {
9201                                                 if (auth == NULL) {
9202                                                         m = sctp_add_auth_chunk(m,
9203                                                             &endofchain,
9204                                                             &auth,
9205                                                             &auth_offset,
9206                                                             stcb,
9207                                                             SCTP_DATA);
9208                                                         auth_keyid = fwd->auth_keyid;
9209                                                         override_ok = 0;
9210                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9211                                                 } else if (override_ok) {
9212                                                         auth_keyid = fwd->auth_keyid;
9213                                                         override_ok = 0;
9214                                                 } else if (fwd->auth_keyid != auth_keyid) {
9215                                                         /*
9216                                                          * different keyid,
9217                                                          * so done bundling
9218                                                          */
9219                                                         break;
9220                                                 }
9221                                         }
9222                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9223                                         if (m == NULL) {
9224                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9225                                                 return (ENOMEM);
9226                                         }
9227                                         /* Do clear IP_DF ? */
9228                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9229                                                 no_fragmentflg = 0;
9230                                         }
9231                                         /* upate our MTU size */
9232                                         if (mtu > (fwd->send_size + dmtu))
9233                                                 mtu -= (fwd->send_size + dmtu);
9234                                         else
9235                                                 mtu = 0;
9236                                         data_list[bundle_at++] = fwd;
9237                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9238                                                 break;
9239                                         }
9240                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9241                                 } else {
9242                                         /* can't fit so we are done */
9243                                         break;
9244                                 }
9245                         }
9246                 }
9247                 /* Is there something to send for this destination? */
9248                 if (m) {
9249                         /*
9250                          * No matter if we fail/or suceed we should start a
9251                          * timer. A failure is like a lost IP packet :-)
9252                          */
9253                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9254                                 /*
9255                                  * no timer running on this destination
9256                                  * restart it.
9257                                  */
9258                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9259                                 tmr_started = 1;
9260                         }
9261                         /* Now lets send it, if there is anything to send :> */
9262                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9263                             (struct sockaddr *)&net->ro._l_addr, m,
9264                             auth_offset, auth, auth_keyid,
9265                             no_fragmentflg, 0, NULL, 0,
9266                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9267                             net->port, so_locked, NULL))) {
9268                                 /* error, we could not output */
9269                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9270                                 return (error);
9271                         }
9272                         m = endofchain = NULL;
9273                         auth = NULL;
9274                         auth_offset = 0;
9275                         /* For HB's */
9276                         /*
9277                          * We don't want to mark the net->sent time here
9278                          * since this we use this for HB and retrans cannot
9279                          * measure RTT
9280                          */
9281                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9282
9283                         /* For auto-close */
9284                         cnt_thru++;
9285                         if (*now_filled == 0) {
9286                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9287                                 *now = asoc->time_last_sent;
9288                                 *now_filled = 1;
9289                         } else {
9290                                 asoc->time_last_sent = *now;
9291                         }
9292                         *cnt_out += bundle_at;
9293 #ifdef SCTP_AUDITING_ENABLED
9294                         sctp_audit_log(0xC4, bundle_at);
9295 #endif
9296                         if (bundle_at) {
9297                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9298                         }
9299                         for (i = 0; i < bundle_at; i++) {
9300                                 SCTP_STAT_INCR(sctps_sendretransdata);
9301                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9302                                 /*
9303                                  * When we have a revoked data, and we
9304                                  * retransmit it, then we clear the revoked
9305                                  * flag since this flag dictates if we
9306                                  * subtracted from the fs
9307                                  */
9308                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9309                                         /* Deflate the cwnd */
9310                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9311                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9312                                 }
9313                                 data_list[i]->snd_count++;
9314                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9315                                 /* record the time */
9316                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9317                                 if (data_list[i]->book_size_scale) {
9318                                         /*
9319                                          * need to double the book size on
9320                                          * this one
9321                                          */
9322                                         data_list[i]->book_size_scale = 0;
9323                                         /*
9324                                          * Since we double the booksize, we
9325                                          * must also double the output queue
9326                                          * size, since this get shrunk when
9327                                          * we free by this amount.
9328                                          */
9329                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9330                                         data_list[i]->book_size *= 2;
9331
9332
9333                                 } else {
9334                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9335                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9336                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9337                                         }
9338                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9339                                             (uint32_t) (data_list[i]->send_size +
9340                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9341                                 }
9342                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9343                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9344                                             data_list[i]->whoTo->flight_size,
9345                                             data_list[i]->book_size,
9346                                             (uintptr_t) data_list[i]->whoTo,
9347                                             data_list[i]->rec.data.TSN_seq);
9348                                 }
9349                                 sctp_flight_size_increase(data_list[i]);
9350                                 sctp_total_flight_increase(stcb, data_list[i]);
9351                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9352                                         /* SWS sender side engages */
9353                                         asoc->peers_rwnd = 0;
9354                                 }
9355                                 if ((i == 0) &&
9356                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9357                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9358                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9359                                             (tmr_started == 0)) {
9360                                                 /*-
9361                                                  * ok we just fast-retrans'd
9362                                                  * the lowest TSN, i.e the
9363                                                  * first on the list. In
9364                                                  * this case we want to give
9365                                                  * some more time to get a
9366                                                  * SACK back without a
9367                                                  * t3-expiring.
9368                                                  */
9369                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9370                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9371                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9372                                         }
9373                                 }
9374                         }
9375                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9376                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9377                         }
9378 #ifdef SCTP_AUDITING_ENABLED
9379                         sctp_auditing(21, inp, stcb, NULL);
9380 #endif
9381                 } else {
9382                         /* None will fit */
9383                         return (1);
9384                 }
9385                 if (asoc->sent_queue_retran_cnt <= 0) {
9386                         /* all done we have no more to retran */
9387                         asoc->sent_queue_retran_cnt = 0;
9388                         break;
9389                 }
9390                 if (one_chunk) {
9391                         /* No more room in rwnd */
9392                         return (1);
9393                 }
9394                 /* stop the for loop here. we sent out a packet */
9395                 break;
9396         }
9397         return (0);
9398 }
9399
9400
9401 static int
9402 sctp_timer_validation(struct sctp_inpcb *inp,
9403     struct sctp_tcb *stcb,
9404     struct sctp_association *asoc,
9405     int ret)
9406 {
9407         struct sctp_nets *net;
9408
9409         /* Validate that a timer is running somewhere */
9410         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9411                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9412                         /* Here is a timer */
9413                         return (ret);
9414                 }
9415         }
9416         SCTP_TCB_LOCK_ASSERT(stcb);
9417         /* Gak, we did not have a timer somewhere */
9418         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9419         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9420         return (ret);
9421 }
9422
9423 void
9424 sctp_chunk_output(struct sctp_inpcb *inp,
9425     struct sctp_tcb *stcb,
9426     int from_where,
9427     int so_locked
9428 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9429     SCTP_UNUSED
9430 #endif
9431 )
9432 {
9433         /*-
9434          * Ok this is the generic chunk service queue. we must do the
9435          * following:
9436          * - See if there are retransmits pending, if so we must
9437          *   do these first.
9438          * - Service the stream queue that is next, moving any
9439          *   message (note I must get a complete message i.e.
9440          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9441          *   TSN's
9442          * - Check to see if the cwnd/rwnd allows any output, if so we
9443          *   go ahead and fomulate and send the low level chunks. Making sure
9444          *   to combine any control in the control chunk queue also.
9445          */
9446         struct sctp_association *asoc;
9447         struct sctp_nets *net;
9448         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9449             burst_cnt = 0, burst_limit = 0;
9450         struct timeval now;
9451         int now_filled = 0;
9452         int nagle_on = 0;
9453         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9454         int un_sent = 0;
9455         int fr_done, tot_frs = 0;
9456
9457         asoc = &stcb->asoc;
9458         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9459                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9460                         nagle_on = 0;
9461                 } else {
9462                         nagle_on = 1;
9463                 }
9464         }
9465         SCTP_TCB_LOCK_ASSERT(stcb);
9466
9467         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9468
9469         if ((un_sent <= 0) &&
9470             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9471             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9472             (asoc->sent_queue_retran_cnt == 0)) {
9473                 /* Nothing to do unless there is something to be sent left */
9474                 return;
9475         }
9476         /*
9477          * Do we have something to send, data or control AND a sack timer
9478          * running, if so piggy-back the sack.
9479          */
9480         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9481                 sctp_send_sack(stcb);
9482                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9483         }
9484         while (asoc->sent_queue_retran_cnt) {
9485                 /*-
9486                  * Ok, it is retransmission time only, we send out only ONE
9487                  * packet with a single call off to the retran code.
9488                  */
9489                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9490                         /*-
9491                          * Special hook for handling cookiess discarded
9492                          * by peer that carried data. Send cookie-ack only
9493                          * and then the next call with get the retran's.
9494                          */
9495                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9496                             from_where,
9497                             &now, &now_filled, frag_point, so_locked);
9498                         return;
9499                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9500                         /* if its not from a HB then do it */
9501                         fr_done = 0;
9502                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9503                         if (fr_done) {
9504                                 tot_frs++;
9505                         }
9506                 } else {
9507                         /*
9508                          * its from any other place, we don't allow retran
9509                          * output (only control)
9510                          */
9511                         ret = 1;
9512                 }
9513                 if (ret > 0) {
9514                         /* Can't send anymore */
9515                         /*-
9516                          * now lets push out control by calling med-level
9517                          * output once. this assures that we WILL send HB's
9518                          * if queued too.
9519                          */
9520                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9521                             from_where,
9522                             &now, &now_filled, frag_point, so_locked);
9523 #ifdef SCTP_AUDITING_ENABLED
9524                         sctp_auditing(8, inp, stcb, NULL);
9525 #endif
9526                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9527                         return;
9528                 }
9529                 if (ret < 0) {
9530                         /*-
9531                          * The count was off.. retran is not happening so do
9532                          * the normal retransmission.
9533                          */
9534 #ifdef SCTP_AUDITING_ENABLED
9535                         sctp_auditing(9, inp, stcb, NULL);
9536 #endif
9537                         if (ret == SCTP_RETRAN_EXIT) {
9538                                 return;
9539                         }
9540                         break;
9541                 }
9542                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9543                         /* Only one transmission allowed out of a timeout */
9544 #ifdef SCTP_AUDITING_ENABLED
9545                         sctp_auditing(10, inp, stcb, NULL);
9546 #endif
9547                         /* Push out any control */
9548                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9549                             &now, &now_filled, frag_point, so_locked);
9550                         return;
9551                 }
9552                 if (tot_frs > asoc->max_burst) {
9553                         /* Hit FR burst limit */
9554                         return;
9555                 }
9556                 if ((num_out == 0) && (ret == 0)) {
9557
9558                         /* No more retrans to send */
9559                         break;
9560                 }
9561         }
9562 #ifdef SCTP_AUDITING_ENABLED
9563         sctp_auditing(12, inp, stcb, NULL);
9564 #endif
9565         /* Check for bad destinations, if they exist move chunks around. */
9566         burst_limit = asoc->max_burst;
9567         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9568                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9569                     SCTP_ADDR_NOT_REACHABLE) {
9570                         /*-
9571                          * if possible move things off of this address we
9572                          * still may send below due to the dormant state but
9573                          * we try to find an alternate address to send to
9574                          * and if we have one we move all queued data on the
9575                          * out wheel to this alternate address.
9576                          */
9577                         if (net->ref_count > 1)
9578                                 sctp_move_chunks_from_net(stcb, net);
9579                 } else if ((asoc->sctp_cmt_on_off == 1) &&
9580                             (asoc->sctp_cmt_pf > 0) &&
9581                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9582                         /*
9583                          * JRS 5/14/07 - If CMT PF is on and the current
9584                          * destination is in PF state, move all queued data
9585                          * to an alternate desination.
9586                          */
9587                         if (net->ref_count > 1)
9588                                 sctp_move_chunks_from_net(stcb, net);
9589                 } else {
9590                         /*-
9591                          * if ((asoc->sat_network) || (net->addr_is_local))
9592                          * { burst_limit = asoc->max_burst *
9593                          * SCTP_SAT_NETWORK_BURST_INCR; }
9594                          */
9595                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9596                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9597                                         /*
9598                                          * JRS - Use the congestion control
9599                                          * given in the congestion control
9600                                          * module
9601                                          */
9602                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9603                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9604                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9605                                         }
9606                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9607                                 }
9608                                 net->fast_retran_ip = 0;
9609                         } else {
9610                                 if (net->flight_size == 0) {
9611                                         /* Should be decaying the cwnd here */
9612                                         ;
9613                                 }
9614                         }
9615                 }
9616
9617         }
9618         burst_cnt = 0;
9619         do {
9620                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9621                     &reason_code, 0, from_where,
9622                     &now, &now_filled, frag_point, so_locked);
9623                 if (error) {
9624                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9625                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9626                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9627                         }
9628                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9629                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9630                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9631                         }
9632                         break;
9633                 }
9634                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9635
9636                 tot_out += num_out;
9637                 burst_cnt++;
9638                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9639                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9640                         if (num_out == 0) {
9641                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9642                         }
9643                 }
9644                 if (nagle_on) {
9645                         /*-
9646                          * When nagle is on, we look at how much is un_sent, then
9647                          * if its smaller than an MTU and we have data in
9648                          * flight we stop.
9649                          */
9650                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9651                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9652                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9653                             (stcb->asoc.total_flight > 0)) {
9654                                 break;
9655                         }
9656                 }
9657                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9658                     TAILQ_EMPTY(&asoc->send_queue) &&
9659                     TAILQ_EMPTY(&asoc->out_wheel)) {
9660                         /* Nothing left to send */
9661                         break;
9662                 }
9663                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9664                         /* Nothing left to send */
9665                         break;
9666                 }
9667         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9668             (burst_cnt < burst_limit)));
9669
9670         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9671                 if (burst_cnt >= burst_limit) {
9672                         SCTP_STAT_INCR(sctps_maxburstqueued);
9673                         asoc->burst_limit_applied = 1;
9674                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9675                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9676                         }
9677                 } else {
9678                         asoc->burst_limit_applied = 0;
9679                 }
9680         }
9681         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9682                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9683         }
9684         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9685             tot_out);
9686
9687         /*-
9688          * Now we need to clean up the control chunk chain if a ECNE is on
9689          * it. It must be marked as UNSENT again so next call will continue
9690          * to send it until such time that we get a CWR, to remove it.
9691          */
9692         if (stcb->asoc.ecn_echo_cnt_onq)
9693                 sctp_fix_ecn_echo(asoc);
9694         return;
9695 }
9696
9697
9698 int
9699 sctp_output(inp, m, addr, control, p, flags)
9700         struct sctp_inpcb *inp;
9701         struct mbuf *m;
9702         struct sockaddr *addr;
9703         struct mbuf *control;
9704         struct thread *p;
9705         int flags;
9706 {
9707         if (inp == NULL) {
9708                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9709                 return (EINVAL);
9710         }
9711         if (inp->sctp_socket == NULL) {
9712                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9713                 return (EINVAL);
9714         }
9715         return (sctp_sosend(inp->sctp_socket,
9716             addr,
9717             (struct uio *)NULL,
9718             m,
9719             control,
9720             flags, p
9721             ));
9722 }
9723
9724 void
9725 send_forward_tsn(struct sctp_tcb *stcb,
9726     struct sctp_association *asoc)
9727 {
9728         struct sctp_tmit_chunk *chk;
9729         struct sctp_forward_tsn_chunk *fwdtsn;
9730         uint32_t advance_peer_ack_point;
9731
9732         SCTP_TCB_LOCK_ASSERT(stcb);
9733         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9734                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9735                         /* mark it to unsent */
9736                         chk->sent = SCTP_DATAGRAM_UNSENT;
9737                         chk->snd_count = 0;
9738                         /* Do we correct its output location? */
9739                         if (chk->whoTo != asoc->primary_destination) {
9740                                 sctp_free_remote_addr(chk->whoTo);
9741                                 chk->whoTo = asoc->primary_destination;
9742                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9743                         }
9744                         goto sctp_fill_in_rest;
9745                 }
9746         }
9747         /* Ok if we reach here we must build one */
9748         sctp_alloc_a_chunk(stcb, chk);
9749         if (chk == NULL) {
9750                 return;
9751         }
9752         asoc->fwd_tsn_cnt++;
9753         chk->copy_by_ref = 0;
9754         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9755         chk->rec.chunk_id.can_take_data = 0;
9756         chk->asoc = asoc;
9757         chk->whoTo = NULL;
9758         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9759         if (chk->data == NULL) {
9760                 sctp_free_a_chunk(stcb, chk);
9761                 return;
9762         }
9763         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9764         chk->sent = SCTP_DATAGRAM_UNSENT;
9765         chk->snd_count = 0;
9766         chk->whoTo = asoc->primary_destination;
9767         atomic_add_int(&chk->whoTo->ref_count, 1);
9768         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9769         asoc->ctrl_queue_cnt++;
9770 sctp_fill_in_rest:
9771         /*-
9772          * Here we go through and fill out the part that deals with
9773          * stream/seq of the ones we skip.
9774          */
9775         SCTP_BUF_LEN(chk->data) = 0;
9776         {
9777                 struct sctp_tmit_chunk *at, *tp1, *last;
9778                 struct sctp_strseq *strseq;
9779                 unsigned int cnt_of_space, i, ovh;
9780                 unsigned int space_needed;
9781                 unsigned int cnt_of_skipped = 0;
9782
9783                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9784                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9785                                 /* no more to look at */
9786                                 break;
9787                         }
9788                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9789                                 /* We don't report these */
9790                                 continue;
9791                         }
9792                         cnt_of_skipped++;
9793                 }
9794                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9795                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9796
9797                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9798
9799                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9800                         ovh = SCTP_MIN_OVERHEAD;
9801                 } else {
9802                         ovh = SCTP_MIN_V4_OVERHEAD;
9803                 }
9804                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9805                         /* trim to a mtu size */
9806                         cnt_of_space = asoc->smallest_mtu - ovh;
9807                 }
9808                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9809                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9810                             0xff, 0, cnt_of_skipped,
9811                             asoc->advanced_peer_ack_point);
9812
9813                 }
9814                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9815                 if (cnt_of_space < space_needed) {
9816                         /*-
9817                          * ok we must trim down the chunk by lowering the
9818                          * advance peer ack point.
9819                          */
9820                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9821                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9822                                     0xff, 0xff, cnt_of_space,
9823                                     space_needed);
9824                         }
9825                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9826                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9827                         /*-
9828                          * Go through and find the TSN that will be the one
9829                          * we report.
9830                          */
9831                         at = TAILQ_FIRST(&asoc->sent_queue);
9832                         for (i = 0; i < cnt_of_skipped; i++) {
9833                                 tp1 = TAILQ_NEXT(at, sctp_next);
9834                                 if (tp1 == NULL) {
9835                                         break;
9836                                 }
9837                                 at = tp1;
9838                         }
9839                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9840                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9841                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9842                                     asoc->advanced_peer_ack_point);
9843                         }
9844                         last = at;
9845                         /*-
9846                          * last now points to last one I can report, update
9847                          * peer ack point
9848                          */
9849                         if (last)
9850                                 advance_peer_ack_point = last->rec.data.TSN_seq;
9851                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
9852                             cnt_of_skipped * sizeof(struct sctp_strseq);
9853                 }
9854                 chk->send_size = space_needed;
9855                 /* Setup the chunk */
9856                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9857                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9858                 fwdtsn->ch.chunk_flags = 0;
9859                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9860                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9861                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9862                 fwdtsn++;
9863                 /*-
9864                  * Move pointer to after the fwdtsn and transfer to the
9865                  * strseq pointer.
9866                  */
9867                 strseq = (struct sctp_strseq *)fwdtsn;
9868                 /*-
9869                  * Now populate the strseq list. This is done blindly
9870                  * without pulling out duplicate stream info. This is
9871                  * inefficent but won't harm the process since the peer will
9872                  * look at these in sequence and will thus release anything.
9873                  * It could mean we exceed the PMTU and chop off some that
9874                  * we could have included.. but this is unlikely (aka 1432/4
9875                  * would mean 300+ stream seq's would have to be reported in
9876                  * one FWD-TSN. With a bit of work we can later FIX this to
9877                  * optimize and pull out duplcates.. but it does add more
9878                  * overhead. So for now... not!
9879                  */
9880                 at = TAILQ_FIRST(&asoc->sent_queue);
9881                 for (i = 0; i < cnt_of_skipped; i++) {
9882                         tp1 = TAILQ_NEXT(at, sctp_next);
9883                         if (tp1 == NULL)
9884                                 break;
9885                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9886                                 /* We don't report these */
9887                                 i--;
9888                                 at = tp1;
9889                                 continue;
9890                         }
9891                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9892                                 at->rec.data.fwd_tsn_cnt = 0;
9893                         }
9894                         strseq->stream = ntohs(at->rec.data.stream_number);
9895                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9896                         strseq++;
9897                         at = tp1;
9898                 }
9899         }
9900         return;
9901
9902 }
9903
9904 void
9905 sctp_send_sack(struct sctp_tcb *stcb)
9906 {
9907         /*-
9908          * Queue up a SACK or NR-SACK in the control queue.
9909          * We must first check to see if a SACK or NR-SACK is
9910          * somehow on the control queue.
9911          * If so, we will take and and remove the old one.
9912          */
9913         struct sctp_association *asoc;
9914         struct sctp_tmit_chunk *chk, *a_chk;
9915         struct sctp_sack_chunk *sack;
9916         struct sctp_nr_sack_chunk *nr_sack;
9917         struct sctp_gap_ack_block *gap_descriptor;
9918         struct sack_track *selector;
9919         int mergeable = 0;
9920         int offset;
9921         caddr_t limit;
9922         uint32_t *dup;
9923         int limit_reached = 0;
9924         unsigned int i, siz, j;
9925         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9926         int num_dups = 0;
9927         int space_req;
9928         uint32_t highest_tsn;
9929         uint8_t flags;
9930         uint8_t type;
9931         uint8_t tsn_map;
9932
9933         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
9934             (stcb->asoc.peer_supports_nr_sack == 1)) {
9935                 type = SCTP_NR_SELECTIVE_ACK;
9936         } else {
9937                 type = SCTP_SELECTIVE_ACK;
9938         }
9939         a_chk = NULL;
9940         asoc = &stcb->asoc;
9941         SCTP_TCB_LOCK_ASSERT(stcb);
9942         if (asoc->last_data_chunk_from == NULL) {
9943                 /* Hmm we never received anything */
9944                 return;
9945         }
9946         sctp_slide_mapping_arrays(stcb);
9947         sctp_set_rwnd(stcb, asoc);
9948         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9949                 if (chk->rec.chunk_id.id == type) {
9950                         /* Hmm, found a sack already on queue, remove it */
9951                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9952                         asoc->ctrl_queue_cnt--;
9953                         a_chk = chk;
9954                         if (a_chk->data) {
9955                                 sctp_m_freem(a_chk->data);
9956                                 a_chk->data = NULL;
9957                         }
9958                         sctp_free_remote_addr(a_chk->whoTo);
9959                         a_chk->whoTo = NULL;
9960                         break;
9961                 }
9962         }
9963         if (a_chk == NULL) {
9964                 sctp_alloc_a_chunk(stcb, a_chk);
9965                 if (a_chk == NULL) {
9966                         /* No memory so we drop the idea, and set a timer */
9967                         if (stcb->asoc.delayed_ack) {
9968                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9969                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9970                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9971                                     stcb->sctp_ep, stcb, NULL);
9972                         } else {
9973                                 stcb->asoc.send_sack = 1;
9974                         }
9975                         return;
9976                 }
9977                 a_chk->copy_by_ref = 0;
9978                 a_chk->rec.chunk_id.id = type;
9979                 a_chk->rec.chunk_id.can_take_data = 1;
9980         }
9981         /* Clear our pkt counts */
9982         asoc->data_pkts_seen = 0;
9983
9984         a_chk->asoc = asoc;
9985         a_chk->snd_count = 0;
9986         a_chk->send_size = 0;   /* fill in later */
9987         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9988         a_chk->whoTo = NULL;
9989
9990         if ((asoc->numduptsns) ||
9991             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) {
9992                 /*-
9993                  * Ok, we have some duplicates or the destination for the
9994                  * sack is unreachable, lets see if we can select an
9995                  * alternate than asoc->last_data_chunk_from
9996                  */
9997                 if ((!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) &&
9998                     (asoc->used_alt_onsack > asoc->numnets)) {
9999                         /* We used an alt last time, don't this time */
10000                         a_chk->whoTo = NULL;
10001                 } else {
10002                         asoc->used_alt_onsack++;
10003                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10004                 }
10005                 if (a_chk->whoTo == NULL) {
10006                         /* Nope, no alternate */
10007                         a_chk->whoTo = asoc->last_data_chunk_from;
10008                         asoc->used_alt_onsack = 0;
10009                 }
10010         } else {
10011                 /*
10012                  * No duplicates so we use the last place we received data
10013                  * from.
10014                  */
10015                 asoc->used_alt_onsack = 0;
10016                 a_chk->whoTo = asoc->last_data_chunk_from;
10017         }
10018         if (a_chk->whoTo) {
10019                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10020         }
10021         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map, MAX_TSN)) {
10022                 highest_tsn = asoc->highest_tsn_inside_map;
10023         } else {
10024                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10025         }
10026         if (highest_tsn == asoc->cumulative_tsn) {
10027                 /* no gaps */
10028                 if (type == SCTP_SELECTIVE_ACK) {
10029                         space_req = sizeof(struct sctp_sack_chunk);
10030                 } else {
10031                         space_req = sizeof(struct sctp_nr_sack_chunk);
10032                 }
10033         } else {
10034                 /* gaps get a cluster */
10035                 space_req = MCLBYTES;
10036         }
10037         /* Ok now lets formulate a MBUF with our sack */
10038         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10039         if ((a_chk->data == NULL) ||
10040             (a_chk->whoTo == NULL)) {
10041                 /* rats, no mbuf memory */
10042                 if (a_chk->data) {
10043                         /* was a problem with the destination */
10044                         sctp_m_freem(a_chk->data);
10045                         a_chk->data = NULL;
10046                 }
10047                 sctp_free_a_chunk(stcb, a_chk);
10048                 /* sa_ignore NO_NULL_CHK */
10049                 if (stcb->asoc.delayed_ack) {
10050                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10051                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10052                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10053                             stcb->sctp_ep, stcb, NULL);
10054                 } else {
10055                         stcb->asoc.send_sack = 1;
10056                 }
10057                 return;
10058         }
10059         /* ok, lets go through and fill it in */
10060         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10061         space = M_TRAILINGSPACE(a_chk->data);
10062         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10063                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10064         }
10065         limit = mtod(a_chk->data, caddr_t);
10066         limit += space;
10067
10068         /* 0x01 is used by nonce for ecn */
10069         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10070             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10071             (asoc->peer_supports_ecn_nonce))
10072                 flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10073         else
10074                 flags = 0;
10075
10076         if ((asoc->sctp_cmt_on_off == 1) &&
10077             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10078                 /*-
10079                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10080                  * received, then set high bit to 1, else 0. Reset
10081                  * pkts_rcvd.
10082                  */
10083                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10084                 asoc->cmt_dac_pkts_rcvd = 0;
10085         }
10086 #ifdef SCTP_ASOCLOG_OF_TSNS
10087         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10088         stcb->asoc.cumack_log_atsnt++;
10089         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10090                 stcb->asoc.cumack_log_atsnt = 0;
10091         }
10092 #endif
10093         /* reset the readers interpretation */
10094         stcb->freed_by_sorcv_sincelast = 0;
10095
10096         if (type == SCTP_SELECTIVE_ACK) {
10097                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10098                 nr_sack = NULL;
10099                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10100                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10101                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10102                 } else {
10103                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10104                 }
10105         } else {
10106                 sack = NULL;
10107                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10108                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10109                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10110                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10111                 } else {
10112                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10113                 }
10114         }
10115
10116         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10117                 offset = 1;
10118         } else {
10119                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10120         }
10121         if (((type == SCTP_SELECTIVE_ACK) &&
10122             compare_with_wrap(highest_tsn, asoc->cumulative_tsn, MAX_TSN)) ||
10123             ((type == SCTP_NR_SELECTIVE_ACK) &&
10124             compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN))) {
10125                 /* we have a gap .. maybe */
10126                 for (i = 0; i < siz; i++) {
10127                         tsn_map = asoc->mapping_array[i];
10128                         if (type == SCTP_SELECTIVE_ACK) {
10129                                 tsn_map |= asoc->nr_mapping_array[i];
10130                         }
10131                         if (i == 0) {
10132                                 /*
10133                                  * Clear all bits corresponding to TSNs
10134                                  * smaller or equal to the cumulative TSN.
10135                                  */
10136                                 tsn_map &= (~0 << (1 - offset));
10137                         }
10138                         selector = &sack_array[tsn_map];
10139                         if (mergeable && selector->right_edge) {
10140                                 /*
10141                                  * Backup, left and right edges were ok to
10142                                  * merge.
10143                                  */
10144                                 num_gap_blocks--;
10145                                 gap_descriptor--;
10146                         }
10147                         if (selector->num_entries == 0)
10148                                 mergeable = 0;
10149                         else {
10150                                 for (j = 0; j < selector->num_entries; j++) {
10151                                         if (mergeable && selector->right_edge) {
10152                                                 /*
10153                                                  * do a merge by NOT setting
10154                                                  * the left side
10155                                                  */
10156                                                 mergeable = 0;
10157                                         } else {
10158                                                 /*
10159                                                  * no merge, set the left
10160                                                  * side
10161                                                  */
10162                                                 mergeable = 0;
10163                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10164                                         }
10165                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10166                                         num_gap_blocks++;
10167                                         gap_descriptor++;
10168                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10169                                                 /* no more room */
10170                                                 limit_reached = 1;
10171                                                 break;
10172                                         }
10173                                 }
10174                                 if (selector->left_edge) {
10175                                         mergeable = 1;
10176                                 }
10177                         }
10178                         if (limit_reached) {
10179                                 /* Reached the limit stop */
10180                                 break;
10181                         }
10182                         offset += 8;
10183                 }
10184         }
10185         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10186             (limit_reached == 0)) {
10187
10188                 mergeable = 0;
10189
10190                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10191                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10192                 } else {
10193                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10194                 }
10195
10196                 if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10197                         offset = 1;
10198                 } else {
10199                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10200                 }
10201                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10202                         /* we have a gap .. maybe */
10203                         for (i = 0; i < siz; i++) {
10204                                 tsn_map = asoc->nr_mapping_array[i];
10205                                 if (i == 0) {
10206                                         /*
10207                                          * Clear all bits corresponding to
10208                                          * TSNs smaller or equal to the
10209                                          * cumulative TSN.
10210                                          */
10211                                         tsn_map &= (~0 << (1 - offset));
10212                                 }
10213                                 selector = &sack_array[tsn_map];
10214                                 if (mergeable && selector->right_edge) {
10215                                         /*
10216                                          * Backup, left and right edges were
10217                                          * ok to merge.
10218                                          */
10219                                         num_nr_gap_blocks--;
10220                                         gap_descriptor--;
10221                                 }
10222                                 if (selector->num_entries == 0)
10223                                         mergeable = 0;
10224                                 else {
10225                                         for (j = 0; j < selector->num_entries; j++) {
10226                                                 if (mergeable && selector->right_edge) {
10227                                                         /*
10228                                                          * do a merge by NOT
10229                                                          * setting the left
10230                                                          * side
10231                                                          */
10232                                                         mergeable = 0;
10233                                                 } else {
10234                                                         /*
10235                                                          * no merge, set the
10236                                                          * left side
10237                                                          */
10238                                                         mergeable = 0;
10239                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10240                                                 }
10241                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10242                                                 num_nr_gap_blocks++;
10243                                                 gap_descriptor++;
10244                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10245                                                         /* no more room */
10246                                                         limit_reached = 1;
10247                                                         break;
10248                                                 }
10249                                         }
10250                                         if (selector->left_edge) {
10251                                                 mergeable = 1;
10252                                         }
10253                                 }
10254                                 if (limit_reached) {
10255                                         /* Reached the limit stop */
10256                                         break;
10257                                 }
10258                                 offset += 8;
10259                         }
10260                 }
10261         }
10262         /* now we must add any dups we are going to report. */
10263         if ((limit_reached == 0) && (asoc->numduptsns)) {
10264                 dup = (uint32_t *) gap_descriptor;
10265                 for (i = 0; i < asoc->numduptsns; i++) {
10266                         *dup = htonl(asoc->dup_tsns[i]);
10267                         dup++;
10268                         num_dups++;
10269                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10270                                 /* no more room */
10271                                 break;
10272                         }
10273                 }
10274                 asoc->numduptsns = 0;
10275         }
10276         /*
10277          * now that the chunk is prepared queue it to the control chunk
10278          * queue.
10279          */
10280         if (type == SCTP_SELECTIVE_ACK) {
10281                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10282                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10283                     num_dups * sizeof(int32_t);
10284                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10285                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10286                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10287                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10288                 sack->sack.num_dup_tsns = htons(num_dups);
10289                 sack->ch.chunk_type = type;
10290                 sack->ch.chunk_flags = flags;
10291                 sack->ch.chunk_length = htons(a_chk->send_size);
10292         } else {
10293                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10294                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10295                     num_dups * sizeof(int32_t);
10296                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10297                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10298                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10299                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10300                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10301                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10302                 nr_sack->nr_sack.reserved = 0;
10303                 nr_sack->ch.chunk_type = type;
10304                 nr_sack->ch.chunk_flags = flags;
10305                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10306         }
10307         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10308         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10309         asoc->ctrl_queue_cnt++;
10310         asoc->send_sack = 0;
10311         SCTP_STAT_INCR(sctps_sendsacks);
10312         return;
10313 }
10314
10315 void
10316 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10317 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10318     SCTP_UNUSED
10319 #endif
10320 )
10321 {
10322         struct mbuf *m_abort;
10323         struct mbuf *m_out = NULL, *m_end = NULL;
10324         struct sctp_abort_chunk *abort = NULL;
10325         int sz;
10326         uint32_t auth_offset = 0;
10327         struct sctp_auth_chunk *auth = NULL;
10328
10329         /*-
10330          * Add an AUTH chunk, if chunk requires it and save the offset into
10331          * the chain for AUTH
10332          */
10333         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10334             stcb->asoc.peer_auth_chunks)) {
10335                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10336                     stcb, SCTP_ABORT_ASSOCIATION);
10337                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10338         }
10339         SCTP_TCB_LOCK_ASSERT(stcb);
10340         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10341         if (m_abort == NULL) {
10342                 /* no mbuf's */
10343                 if (m_out)
10344                         sctp_m_freem(m_out);
10345                 return;
10346         }
10347         /* link in any error */
10348         SCTP_BUF_NEXT(m_abort) = operr;
10349         sz = 0;
10350         if (operr) {
10351                 struct mbuf *n;
10352
10353                 n = operr;
10354                 while (n) {
10355                         sz += SCTP_BUF_LEN(n);
10356                         n = SCTP_BUF_NEXT(n);
10357                 }
10358         }
10359         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10360         if (m_out == NULL) {
10361                 /* NO Auth chunk prepended, so reserve space in front */
10362                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10363                 m_out = m_abort;
10364         } else {
10365                 /* Put AUTH chunk at the front of the chain */
10366                 SCTP_BUF_NEXT(m_end) = m_abort;
10367         }
10368
10369         /* fill in the ABORT chunk */
10370         abort = mtod(m_abort, struct sctp_abort_chunk *);
10371         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10372         abort->ch.chunk_flags = 0;
10373         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10374
10375         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10376             stcb->asoc.primary_destination,
10377             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10378             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10379             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10380             stcb->asoc.primary_destination->port, so_locked, NULL);
10381         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10382 }
10383
10384 void
10385 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10386     struct sctp_nets *net,
10387     int reflect_vtag)
10388 {
10389         /* formulate and SEND a SHUTDOWN-COMPLETE */
10390         struct mbuf *m_shutdown_comp;
10391         struct sctp_shutdown_complete_chunk *shutdown_complete;
10392         uint32_t vtag;
10393         uint8_t flags;
10394
10395         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10396         if (m_shutdown_comp == NULL) {
10397                 /* no mbuf's */
10398                 return;
10399         }
10400         if (reflect_vtag) {
10401                 flags = SCTP_HAD_NO_TCB;
10402                 vtag = stcb->asoc.my_vtag;
10403         } else {
10404                 flags = 0;
10405                 vtag = stcb->asoc.peer_vtag;
10406         }
10407         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10408         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10409         shutdown_complete->ch.chunk_flags = flags;
10410         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10411         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10412         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10413             (struct sockaddr *)&net->ro._l_addr,
10414             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10415             stcb->sctp_ep->sctp_lport, stcb->rport,
10416             htonl(vtag),
10417             net->port, SCTP_SO_NOT_LOCKED, NULL);
10418         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10419         return;
10420 }
10421
10422 void
10423 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10424     uint32_t vrf_id, uint16_t port)
10425 {
10426         /* formulate and SEND a SHUTDOWN-COMPLETE */
10427         struct mbuf *o_pak;
10428         struct mbuf *mout;
10429         struct ip *iph, *iph_out;
10430         struct udphdr *udp = NULL;
10431
10432 #ifdef INET6
10433         struct ip6_hdr *ip6, *ip6_out;
10434
10435 #endif
10436         int offset_out, len, mlen;
10437         struct sctp_shutdown_complete_msg *comp_cp;
10438
10439         iph = mtod(m, struct ip *);
10440         switch (iph->ip_v) {
10441         case IPVERSION:
10442                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10443                 break;
10444 #ifdef INET6
10445         case IPV6_VERSION >> 4:
10446                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10447                 break;
10448 #endif
10449         default:
10450                 return;
10451         }
10452         if (port) {
10453                 len += sizeof(struct udphdr);
10454         }
10455         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10456         if (mout == NULL) {
10457                 return;
10458         }
10459         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10460         SCTP_BUF_LEN(mout) = len;
10461         SCTP_BUF_NEXT(mout) = NULL;
10462         iph_out = NULL;
10463 #ifdef INET6
10464         ip6_out = NULL;
10465 #endif
10466         offset_out = 0;
10467
10468         switch (iph->ip_v) {
10469         case IPVERSION:
10470                 iph_out = mtod(mout, struct ip *);
10471
10472                 /* Fill in the IP header for the ABORT */
10473                 iph_out->ip_v = IPVERSION;
10474                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10475                 iph_out->ip_tos = (u_char)0;
10476                 iph_out->ip_id = 0;
10477                 iph_out->ip_off = 0;
10478                 iph_out->ip_ttl = MAXTTL;
10479                 if (port) {
10480                         iph_out->ip_p = IPPROTO_UDP;
10481                 } else {
10482                         iph_out->ip_p = IPPROTO_SCTP;
10483                 }
10484                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10485                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10486
10487                 /* let IP layer calculate this */
10488                 iph_out->ip_sum = 0;
10489                 offset_out += sizeof(*iph_out);
10490                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10491                     (caddr_t)iph_out + offset_out);
10492                 break;
10493 #ifdef INET6
10494         case IPV6_VERSION >> 4:
10495                 ip6 = (struct ip6_hdr *)iph;
10496                 ip6_out = mtod(mout, struct ip6_hdr *);
10497
10498                 /* Fill in the IPv6 header for the ABORT */
10499                 ip6_out->ip6_flow = ip6->ip6_flow;
10500                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10501                 if (port) {
10502                         ip6_out->ip6_nxt = IPPROTO_UDP;
10503                 } else {
10504                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10505                 }
10506                 ip6_out->ip6_src = ip6->ip6_dst;
10507                 ip6_out->ip6_dst = ip6->ip6_src;
10508                 /*
10509                  * ?? The old code had both the iph len + payload, I think
10510                  * this is wrong and would never have worked
10511                  */
10512                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10513                 offset_out += sizeof(*ip6_out);
10514                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10515                     (caddr_t)ip6_out + offset_out);
10516                 break;
10517 #endif                          /* INET6 */
10518         default:
10519                 /* Currently not supported. */
10520                 sctp_m_freem(mout);
10521                 return;
10522         }
10523         if (port) {
10524                 udp = (struct udphdr *)comp_cp;
10525                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10526                 udp->uh_dport = port;
10527                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10528                 if (iph_out)
10529                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10530                 offset_out += sizeof(struct udphdr);
10531                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10532         }
10533         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10534                 /* no mbuf's */
10535                 sctp_m_freem(mout);
10536                 return;
10537         }
10538         /* Now copy in and fill in the ABORT tags etc. */
10539         comp_cp->sh.src_port = sh->dest_port;
10540         comp_cp->sh.dest_port = sh->src_port;
10541         comp_cp->sh.checksum = 0;
10542         comp_cp->sh.v_tag = sh->v_tag;
10543         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10544         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10545         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10546
10547         if (iph_out != NULL) {
10548                 sctp_route_t ro;
10549                 int ret;
10550
10551                 mlen = SCTP_BUF_LEN(mout);
10552                 bzero(&ro, sizeof ro);
10553                 /* set IPv4 length */
10554                 iph_out->ip_len = mlen;
10555 #ifdef  SCTP_PACKET_LOGGING
10556                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10557                         sctp_packet_log(mout, mlen);
10558 #endif
10559                 if (port) {
10560 #if defined(SCTP_WITH_NO_CSUM)
10561                         SCTP_STAT_INCR(sctps_sendnocrc);
10562 #else
10563                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10564                         SCTP_STAT_INCR(sctps_sendswcrc);
10565 #endif
10566                         SCTP_ENABLE_UDP_CSUM(mout);
10567                 } else {
10568 #if defined(SCTP_WITH_NO_CSUM)
10569                         SCTP_STAT_INCR(sctps_sendnocrc);
10570 #else
10571                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10572                         mout->m_pkthdr.csum_data = 0;
10573                         SCTP_STAT_INCR(sctps_sendhwcrc);
10574 #endif
10575                 }
10576                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10577                 /* out it goes */
10578                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10579
10580                 /* Free the route if we got one back */
10581                 if (ro.ro_rt)
10582                         RTFREE(ro.ro_rt);
10583         }
10584 #ifdef INET6
10585         if (ip6_out != NULL) {
10586                 struct route_in6 ro;
10587                 int ret;
10588                 struct ifnet *ifp = NULL;
10589
10590                 bzero(&ro, sizeof(ro));
10591                 mlen = SCTP_BUF_LEN(mout);
10592 #ifdef  SCTP_PACKET_LOGGING
10593                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10594                         sctp_packet_log(mout, mlen);
10595 #endif
10596                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10597                 if (port) {
10598 #if defined(SCTP_WITH_NO_CSUM)
10599                         SCTP_STAT_INCR(sctps_sendnocrc);
10600 #else
10601                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10602                         SCTP_STAT_INCR(sctps_sendswcrc);
10603 #endif
10604                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10605                                 udp->uh_sum = 0xffff;
10606                         }
10607                 } else {
10608 #if defined(SCTP_WITH_NO_CSUM)
10609                         SCTP_STAT_INCR(sctps_sendnocrc);
10610 #else
10611                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10612                         mout->m_pkthdr.csum_data = 0;
10613                         SCTP_STAT_INCR(sctps_sendhwcrc);
10614 #endif
10615                 }
10616                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
10617
10618                 /* Free the route if we got one back */
10619                 if (ro.ro_rt)
10620                         RTFREE(ro.ro_rt);
10621         }
10622 #endif
10623         SCTP_STAT_INCR(sctps_sendpackets);
10624         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10625         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10626         return;
10627
10628 }
10629
10630 static struct sctp_nets *
10631 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10632 {
10633         struct sctp_nets *net, *hnet;
10634         int ms_goneby, highest_ms, state_overide = 0;
10635
10636         (void)SCTP_GETTIME_TIMEVAL(now);
10637         highest_ms = 0;
10638         hnet = NULL;
10639         SCTP_TCB_LOCK_ASSERT(stcb);
10640         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10641                 if (
10642                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10643                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10644                     ) {
10645                         /*
10646                          * Skip this guy from consideration if HB is off AND
10647                          * its confirmed
10648                          */
10649                         continue;
10650                 }
10651                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10652                         /* skip this dest net from consideration */
10653                         continue;
10654                 }
10655                 if (net->last_sent_time.tv_sec) {
10656                         /* Sent to so we subtract */
10657                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10658                 } else
10659                         /* Never been sent to */
10660                         ms_goneby = 0x7fffffff;
10661                 /*-
10662                  * When the address state is unconfirmed but still
10663                  * considered reachable, we HB at a higher rate. Once it
10664                  * goes confirmed OR reaches the "unreachable" state, thenw
10665                  * we cut it back to HB at a more normal pace.
10666                  */
10667                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10668                         state_overide = 1;
10669                 } else {
10670                         state_overide = 0;
10671                 }
10672
10673                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10674                     (ms_goneby > highest_ms)) {
10675                         highest_ms = ms_goneby;
10676                         hnet = net;
10677                 }
10678         }
10679         if (hnet &&
10680             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10681                 state_overide = 1;
10682         } else {
10683                 state_overide = 0;
10684         }
10685
10686         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10687                 /*-
10688                  * Found the one with longest delay bounds OR it is
10689                  * unconfirmed and still not marked unreachable.
10690                  */
10691                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10692 #ifdef SCTP_DEBUG
10693                 if (hnet) {
10694                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10695                             (struct sockaddr *)&hnet->ro._l_addr);
10696                 } else {
10697                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10698                 }
10699 #endif
10700                 /* update the timer now */
10701                 hnet->last_sent_time = *now;
10702                 return (hnet);
10703         }
10704         /* Nothing to HB */
10705         return (NULL);
10706 }
10707
10708 int
10709 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10710 {
10711         struct sctp_tmit_chunk *chk;
10712         struct sctp_nets *net;
10713         struct sctp_heartbeat_chunk *hb;
10714         struct timeval now;
10715         struct sockaddr_in *sin;
10716         struct sockaddr_in6 *sin6;
10717
10718         SCTP_TCB_LOCK_ASSERT(stcb);
10719         if (user_req == 0) {
10720                 net = sctp_select_hb_destination(stcb, &now);
10721                 if (net == NULL) {
10722                         /*-
10723                          * All our busy none to send to, just start the
10724                          * timer again.
10725                          */
10726                         if (stcb->asoc.state == 0) {
10727                                 return (0);
10728                         }
10729                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10730                             stcb->sctp_ep,
10731                             stcb,
10732                             net);
10733                         return (0);
10734                 }
10735         } else {
10736                 net = u_net;
10737                 if (net == NULL) {
10738                         return (0);
10739                 }
10740                 (void)SCTP_GETTIME_TIMEVAL(&now);
10741         }
10742         sin = (struct sockaddr_in *)&net->ro._l_addr;
10743         if (sin->sin_family != AF_INET) {
10744                 if (sin->sin_family != AF_INET6) {
10745                         /* huh */
10746                         return (0);
10747                 }
10748         }
10749         sctp_alloc_a_chunk(stcb, chk);
10750         if (chk == NULL) {
10751                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10752                 return (0);
10753         }
10754         chk->copy_by_ref = 0;
10755         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10756         chk->rec.chunk_id.can_take_data = 1;
10757         chk->asoc = &stcb->asoc;
10758         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10759
10760         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10761         if (chk->data == NULL) {
10762                 sctp_free_a_chunk(stcb, chk);
10763                 return (0);
10764         }
10765         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10766         SCTP_BUF_LEN(chk->data) = chk->send_size;
10767         chk->sent = SCTP_DATAGRAM_UNSENT;
10768         chk->snd_count = 0;
10769         chk->whoTo = net;
10770         atomic_add_int(&chk->whoTo->ref_count, 1);
10771         /* Now we have a mbuf that we can fill in with the details */
10772         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10773         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10774         /* fill out chunk header */
10775         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10776         hb->ch.chunk_flags = 0;
10777         hb->ch.chunk_length = htons(chk->send_size);
10778         /* Fill out hb parameter */
10779         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10780         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10781         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10782         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10783         /* Did our user request this one, put it in */
10784         hb->heartbeat.hb_info.user_req = user_req;
10785         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10786         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10787         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10788                 /*
10789                  * we only take from the entropy pool if the address is not
10790                  * confirmed.
10791                  */
10792                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10793                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10794         } else {
10795                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10796                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10797         }
10798         if (sin->sin_family == AF_INET) {
10799                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10800         } else if (sin->sin_family == AF_INET6) {
10801                 /* We leave the scope the way it is in our lookup table. */
10802                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10803                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10804         } else {
10805                 /* huh compiler bug */
10806                 return (0);
10807         }
10808
10809         /*
10810          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10811          * PF-heartbeats.  Because of this, threshold management is done by
10812          * the t3 timer handler, and does not need to be done upon the send
10813          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10814          * heartbeat is being sent is in PF state, do NOT do threshold
10815          * management.
10816          */
10817         if ((stcb->asoc.sctp_cmt_pf == 0) ||
10818             ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10819                 /* ok we have a destination that needs a beat */
10820                 /* lets do the theshold management Qiaobing style */
10821                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10822                     stcb->asoc.max_send_times)) {
10823                         /*-
10824                          * we have lost the association, in a way this is
10825                          * quite bad since we really are one less time since
10826                          * we really did not send yet. This is the down side
10827                          * to the Q's style as defined in the RFC and not my
10828                          * alternate style defined in the RFC.
10829                          */
10830                         if (chk->data != NULL) {
10831                                 sctp_m_freem(chk->data);
10832                                 chk->data = NULL;
10833                         }
10834                         /*
10835                          * Here we do NOT use the macro since the
10836                          * association is now gone.
10837                          */
10838                         if (chk->whoTo) {
10839                                 sctp_free_remote_addr(chk->whoTo);
10840                                 chk->whoTo = NULL;
10841                         }
10842                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10843                         return (-1);
10844                 }
10845         }
10846         net->hb_responded = 0;
10847         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10848         stcb->asoc.ctrl_queue_cnt++;
10849         SCTP_STAT_INCR(sctps_sendheartbeat);
10850         /*-
10851          * Call directly med level routine to put out the chunk. It will
10852          * always tumble out control chunks aka HB but it may even tumble
10853          * out data too.
10854          */
10855         return (1);
10856 }
10857
10858 void
10859 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10860     uint32_t high_tsn)
10861 {
10862         struct sctp_association *asoc;
10863         struct sctp_ecne_chunk *ecne;
10864         struct sctp_tmit_chunk *chk;
10865
10866         asoc = &stcb->asoc;
10867         SCTP_TCB_LOCK_ASSERT(stcb);
10868         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10869                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10870                         /* found a previous ECN_ECHO update it if needed */
10871                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10872                         ecne->tsn = htonl(high_tsn);
10873                         return;
10874                 }
10875         }
10876         /* nope could not find one to update so we must build one */
10877         sctp_alloc_a_chunk(stcb, chk);
10878         if (chk == NULL) {
10879                 return;
10880         }
10881         chk->copy_by_ref = 0;
10882         SCTP_STAT_INCR(sctps_sendecne);
10883         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10884         chk->rec.chunk_id.can_take_data = 0;
10885         chk->asoc = &stcb->asoc;
10886         chk->send_size = sizeof(struct sctp_ecne_chunk);
10887         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10888         if (chk->data == NULL) {
10889                 sctp_free_a_chunk(stcb, chk);
10890                 return;
10891         }
10892         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10893         SCTP_BUF_LEN(chk->data) = chk->send_size;
10894         chk->sent = SCTP_DATAGRAM_UNSENT;
10895         chk->snd_count = 0;
10896         chk->whoTo = net;
10897         atomic_add_int(&chk->whoTo->ref_count, 1);
10898         stcb->asoc.ecn_echo_cnt_onq++;
10899         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10900         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10901         ecne->ch.chunk_flags = 0;
10902         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10903         ecne->tsn = htonl(high_tsn);
10904         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10905         asoc->ctrl_queue_cnt++;
10906 }
10907
10908 void
10909 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10910     struct mbuf *m, int iphlen, int bad_crc)
10911 {
10912         struct sctp_association *asoc;
10913         struct sctp_pktdrop_chunk *drp;
10914         struct sctp_tmit_chunk *chk;
10915         uint8_t *datap;
10916         int len;
10917         int was_trunc = 0;
10918         struct ip *iph;
10919
10920 #ifdef INET6
10921         struct ip6_hdr *ip6h;
10922
10923 #endif
10924         int fullsz = 0, extra = 0;
10925         long spc;
10926         int offset;
10927         struct sctp_chunkhdr *ch, chunk_buf;
10928         unsigned int chk_length;
10929
10930         if (!stcb) {
10931                 return;
10932         }
10933         asoc = &stcb->asoc;
10934         SCTP_TCB_LOCK_ASSERT(stcb);
10935         if (asoc->peer_supports_pktdrop == 0) {
10936                 /*-
10937                  * peer must declare support before I send one.
10938                  */
10939                 return;
10940         }
10941         if (stcb->sctp_socket == NULL) {
10942                 return;
10943         }
10944         sctp_alloc_a_chunk(stcb, chk);
10945         if (chk == NULL) {
10946                 return;
10947         }
10948         chk->copy_by_ref = 0;
10949         iph = mtod(m, struct ip *);
10950         if (iph == NULL) {
10951                 sctp_free_a_chunk(stcb, chk);
10952                 return;
10953         }
10954         switch (iph->ip_v) {
10955         case IPVERSION:
10956                 /* IPv4 */
10957                 len = chk->send_size = iph->ip_len;
10958                 break;
10959 #ifdef INET6
10960         case IPV6_VERSION >> 4:
10961                 /* IPv6 */
10962                 ip6h = mtod(m, struct ip6_hdr *);
10963                 len = chk->send_size = htons(ip6h->ip6_plen);
10964                 break;
10965 #endif
10966         default:
10967                 return;
10968         }
10969         /* Validate that we do not have an ABORT in here. */
10970         offset = iphlen + sizeof(struct sctphdr);
10971         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10972             sizeof(*ch), (uint8_t *) & chunk_buf);
10973         while (ch != NULL) {
10974                 chk_length = ntohs(ch->chunk_length);
10975                 if (chk_length < sizeof(*ch)) {
10976                         /* break to abort land */
10977                         break;
10978                 }
10979                 switch (ch->chunk_type) {
10980                 case SCTP_PACKET_DROPPED:
10981                 case SCTP_ABORT_ASSOCIATION:
10982                 case SCTP_INITIATION_ACK:
10983                         /**
10984                          * We don't respond with an PKT-DROP to an ABORT
10985                          * or PKT-DROP. We also do not respond to an
10986                          * INIT-ACK, because we can't know if the initiation
10987                          * tag is correct or not.
10988                          */
10989                         sctp_free_a_chunk(stcb, chk);
10990                         return;
10991                 default:
10992                         break;
10993                 }
10994                 offset += SCTP_SIZE32(chk_length);
10995                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10996                     sizeof(*ch), (uint8_t *) & chunk_buf);
10997         }
10998
10999         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11000             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11001                 /*
11002                  * only send 1 mtu worth, trim off the excess on the end.
11003                  */
11004                 fullsz = len - extra;
11005                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11006                 was_trunc = 1;
11007         }
11008         chk->asoc = &stcb->asoc;
11009         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11010         if (chk->data == NULL) {
11011 jump_out:
11012                 sctp_free_a_chunk(stcb, chk);
11013                 return;
11014         }
11015         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11016         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11017         if (drp == NULL) {
11018                 sctp_m_freem(chk->data);
11019                 chk->data = NULL;
11020                 goto jump_out;
11021         }
11022         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11023             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11024         chk->book_size_scale = 0;
11025         if (was_trunc) {
11026                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11027                 drp->trunc_len = htons(fullsz);
11028                 /*
11029                  * Len is already adjusted to size minus overhead above take
11030                  * out the pkt_drop chunk itself from it.
11031                  */
11032                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11033                 len = chk->send_size;
11034         } else {
11035                 /* no truncation needed */
11036                 drp->ch.chunk_flags = 0;
11037                 drp->trunc_len = htons(0);
11038         }
11039         if (bad_crc) {
11040                 drp->ch.chunk_flags |= SCTP_BADCRC;
11041         }
11042         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11043         SCTP_BUF_LEN(chk->data) = chk->send_size;
11044         chk->sent = SCTP_DATAGRAM_UNSENT;
11045         chk->snd_count = 0;
11046         if (net) {
11047                 /* we should hit here */
11048                 chk->whoTo = net;
11049         } else {
11050                 chk->whoTo = asoc->primary_destination;
11051         }
11052         atomic_add_int(&chk->whoTo->ref_count, 1);
11053         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11054         chk->rec.chunk_id.can_take_data = 1;
11055         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11056         drp->ch.chunk_length = htons(chk->send_size);
11057         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11058         if (spc < 0) {
11059                 spc = 0;
11060         }
11061         drp->bottle_bw = htonl(spc);
11062         if (asoc->my_rwnd) {
11063                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11064                     asoc->size_on_all_streams +
11065                     asoc->my_rwnd_control_len +
11066                     stcb->sctp_socket->so_rcv.sb_cc);
11067         } else {
11068                 /*-
11069                  * If my rwnd is 0, possibly from mbuf depletion as well as
11070                  * space used, tell the peer there is NO space aka onq == bw
11071                  */
11072                 drp->current_onq = htonl(spc);
11073         }
11074         drp->reserved = 0;
11075         datap = drp->data;
11076         m_copydata(m, iphlen, len, (caddr_t)datap);
11077         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11078         asoc->ctrl_queue_cnt++;
11079 }
11080
11081 void
11082 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11083 {
11084         struct sctp_association *asoc;
11085         struct sctp_cwr_chunk *cwr;
11086         struct sctp_tmit_chunk *chk;
11087
11088         asoc = &stcb->asoc;
11089         SCTP_TCB_LOCK_ASSERT(stcb);
11090         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11091                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11092                         /* found a previous ECN_CWR update it if needed */
11093                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11094                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11095                             MAX_TSN)) {
11096                                 cwr->tsn = htonl(high_tsn);
11097                         }
11098                         return;
11099                 }
11100         }
11101         /* nope could not find one to update so we must build one */
11102         sctp_alloc_a_chunk(stcb, chk);
11103         if (chk == NULL) {
11104                 return;
11105         }
11106         chk->copy_by_ref = 0;
11107         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11108         chk->rec.chunk_id.can_take_data = 1;
11109         chk->asoc = &stcb->asoc;
11110         chk->send_size = sizeof(struct sctp_cwr_chunk);
11111         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11112         if (chk->data == NULL) {
11113                 sctp_free_a_chunk(stcb, chk);
11114                 return;
11115         }
11116         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11117         SCTP_BUF_LEN(chk->data) = chk->send_size;
11118         chk->sent = SCTP_DATAGRAM_UNSENT;
11119         chk->snd_count = 0;
11120         chk->whoTo = net;
11121         atomic_add_int(&chk->whoTo->ref_count, 1);
11122         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11123         cwr->ch.chunk_type = SCTP_ECN_CWR;
11124         cwr->ch.chunk_flags = 0;
11125         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11126         cwr->tsn = htonl(high_tsn);
11127         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11128         asoc->ctrl_queue_cnt++;
11129 }
11130
11131 void
11132 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11133     int number_entries, uint16_t * list,
11134     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11135 {
11136         int len, old_len, i;
11137         struct sctp_stream_reset_out_request *req_out;
11138         struct sctp_chunkhdr *ch;
11139
11140         ch = mtod(chk->data, struct sctp_chunkhdr *);
11141
11142
11143         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11144
11145         /* get to new offset for the param. */
11146         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11147         /* now how long will this param be? */
11148         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11149         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11150         req_out->ph.param_length = htons(len);
11151         req_out->request_seq = htonl(seq);
11152         req_out->response_seq = htonl(resp_seq);
11153         req_out->send_reset_at_tsn = htonl(last_sent);
11154         if (number_entries) {
11155                 for (i = 0; i < number_entries; i++) {
11156                         req_out->list_of_streams[i] = htons(list[i]);
11157                 }
11158         }
11159         if (SCTP_SIZE32(len) > len) {
11160                 /*-
11161                  * Need to worry about the pad we may end up adding to the
11162                  * end. This is easy since the struct is either aligned to 4
11163                  * bytes or 2 bytes off.
11164                  */
11165                 req_out->list_of_streams[number_entries] = 0;
11166         }
11167         /* now fix the chunk length */
11168         ch->chunk_length = htons(len + old_len);
11169         chk->book_size = len + old_len;
11170         chk->book_size_scale = 0;
11171         chk->send_size = SCTP_SIZE32(chk->book_size);
11172         SCTP_BUF_LEN(chk->data) = chk->send_size;
11173         return;
11174 }
11175
11176
11177 void
11178 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11179     int number_entries, uint16_t * list,
11180     uint32_t seq)
11181 {
11182         int len, old_len, i;
11183         struct sctp_stream_reset_in_request *req_in;
11184         struct sctp_chunkhdr *ch;
11185
11186         ch = mtod(chk->data, struct sctp_chunkhdr *);
11187
11188
11189         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11190
11191         /* get to new offset for the param. */
11192         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11193         /* now how long will this param be? */
11194         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11195         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11196         req_in->ph.param_length = htons(len);
11197         req_in->request_seq = htonl(seq);
11198         if (number_entries) {
11199                 for (i = 0; i < number_entries; i++) {
11200                         req_in->list_of_streams[i] = htons(list[i]);
11201                 }
11202         }
11203         if (SCTP_SIZE32(len) > len) {
11204                 /*-
11205                  * Need to worry about the pad we may end up adding to the
11206                  * end. This is easy since the struct is either aligned to 4
11207                  * bytes or 2 bytes off.
11208                  */
11209                 req_in->list_of_streams[number_entries] = 0;
11210         }
11211         /* now fix the chunk length */
11212         ch->chunk_length = htons(len + old_len);
11213         chk->book_size = len + old_len;
11214         chk->book_size_scale = 0;
11215         chk->send_size = SCTP_SIZE32(chk->book_size);
11216         SCTP_BUF_LEN(chk->data) = chk->send_size;
11217         return;
11218 }
11219
11220
11221 void
11222 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11223     uint32_t seq)
11224 {
11225         int len, old_len;
11226         struct sctp_stream_reset_tsn_request *req_tsn;
11227         struct sctp_chunkhdr *ch;
11228
11229         ch = mtod(chk->data, struct sctp_chunkhdr *);
11230
11231
11232         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11233
11234         /* get to new offset for the param. */
11235         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11236         /* now how long will this param be? */
11237         len = sizeof(struct sctp_stream_reset_tsn_request);
11238         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11239         req_tsn->ph.param_length = htons(len);
11240         req_tsn->request_seq = htonl(seq);
11241
11242         /* now fix the chunk length */
11243         ch->chunk_length = htons(len + old_len);
11244         chk->send_size = len + old_len;
11245         chk->book_size = SCTP_SIZE32(chk->send_size);
11246         chk->book_size_scale = 0;
11247         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11248         return;
11249 }
11250
11251 void
11252 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11253     uint32_t resp_seq, uint32_t result)
11254 {
11255         int len, old_len;
11256         struct sctp_stream_reset_response *resp;
11257         struct sctp_chunkhdr *ch;
11258
11259         ch = mtod(chk->data, struct sctp_chunkhdr *);
11260
11261
11262         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11263
11264         /* get to new offset for the param. */
11265         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11266         /* now how long will this param be? */
11267         len = sizeof(struct sctp_stream_reset_response);
11268         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11269         resp->ph.param_length = htons(len);
11270         resp->response_seq = htonl(resp_seq);
11271         resp->result = ntohl(result);
11272
11273         /* now fix the chunk length */
11274         ch->chunk_length = htons(len + old_len);
11275         chk->book_size = len + old_len;
11276         chk->book_size_scale = 0;
11277         chk->send_size = SCTP_SIZE32(chk->book_size);
11278         SCTP_BUF_LEN(chk->data) = chk->send_size;
11279         return;
11280
11281 }
11282
11283
11284 void
11285 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11286     uint32_t resp_seq, uint32_t result,
11287     uint32_t send_una, uint32_t recv_next)
11288 {
11289         int len, old_len;
11290         struct sctp_stream_reset_response_tsn *resp;
11291         struct sctp_chunkhdr *ch;
11292
11293         ch = mtod(chk->data, struct sctp_chunkhdr *);
11294
11295
11296         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11297
11298         /* get to new offset for the param. */
11299         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11300         /* now how long will this param be? */
11301         len = sizeof(struct sctp_stream_reset_response_tsn);
11302         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11303         resp->ph.param_length = htons(len);
11304         resp->response_seq = htonl(resp_seq);
11305         resp->result = htonl(result);
11306         resp->senders_next_tsn = htonl(send_una);
11307         resp->receivers_next_tsn = htonl(recv_next);
11308
11309         /* now fix the chunk length */
11310         ch->chunk_length = htons(len + old_len);
11311         chk->book_size = len + old_len;
11312         chk->send_size = SCTP_SIZE32(chk->book_size);
11313         chk->book_size_scale = 0;
11314         SCTP_BUF_LEN(chk->data) = chk->send_size;
11315         return;
11316 }
11317
11318 static void
11319 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11320     uint32_t seq,
11321     uint16_t adding)
11322 {
11323         int len, old_len;
11324         struct sctp_chunkhdr *ch;
11325         struct sctp_stream_reset_add_strm *addstr;
11326
11327         ch = mtod(chk->data, struct sctp_chunkhdr *);
11328         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11329
11330         /* get to new offset for the param. */
11331         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11332         /* now how long will this param be? */
11333         len = sizeof(struct sctp_stream_reset_add_strm);
11334
11335         /* Fill it out. */
11336         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11337         addstr->ph.param_length = htons(len);
11338         addstr->request_seq = htonl(seq);
11339         addstr->number_of_streams = htons(adding);
11340         addstr->reserved = 0;
11341
11342         /* now fix the chunk length */
11343         ch->chunk_length = htons(len + old_len);
11344         chk->send_size = len + old_len;
11345         chk->book_size = SCTP_SIZE32(chk->send_size);
11346         chk->book_size_scale = 0;
11347         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11348         return;
11349 }
11350
11351 int
11352 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11353     int number_entries, uint16_t * list,
11354     uint8_t send_out_req,
11355     uint32_t resp_seq,
11356     uint8_t send_in_req,
11357     uint8_t send_tsn_req,
11358     uint8_t add_stream,
11359     uint16_t adding
11360 )
11361 {
11362
11363         struct sctp_association *asoc;
11364         struct sctp_tmit_chunk *chk;
11365         struct sctp_chunkhdr *ch;
11366         uint32_t seq;
11367
11368         asoc = &stcb->asoc;
11369         if (asoc->stream_reset_outstanding) {
11370                 /*-
11371                  * Already one pending, must get ACK back to clear the flag.
11372                  */
11373                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11374                 return (EBUSY);
11375         }
11376         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11377             (add_stream == 0)) {
11378                 /* nothing to do */
11379                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11380                 return (EINVAL);
11381         }
11382         if (send_tsn_req && (send_out_req || send_in_req)) {
11383                 /* error, can't do that */
11384                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11385                 return (EINVAL);
11386         }
11387         sctp_alloc_a_chunk(stcb, chk);
11388         if (chk == NULL) {
11389                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11390                 return (ENOMEM);
11391         }
11392         chk->copy_by_ref = 0;
11393         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11394         chk->rec.chunk_id.can_take_data = 0;
11395         chk->asoc = &stcb->asoc;
11396         chk->book_size = sizeof(struct sctp_chunkhdr);
11397         chk->send_size = SCTP_SIZE32(chk->book_size);
11398         chk->book_size_scale = 0;
11399
11400         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11401         if (chk->data == NULL) {
11402                 sctp_free_a_chunk(stcb, chk);
11403                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11404                 return (ENOMEM);
11405         }
11406         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11407
11408         /* setup chunk parameters */
11409         chk->sent = SCTP_DATAGRAM_UNSENT;
11410         chk->snd_count = 0;
11411         chk->whoTo = asoc->primary_destination;
11412         atomic_add_int(&chk->whoTo->ref_count, 1);
11413
11414         ch = mtod(chk->data, struct sctp_chunkhdr *);
11415         ch->chunk_type = SCTP_STREAM_RESET;
11416         ch->chunk_flags = 0;
11417         ch->chunk_length = htons(chk->book_size);
11418         SCTP_BUF_LEN(chk->data) = chk->send_size;
11419
11420         seq = stcb->asoc.str_reset_seq_out;
11421         if (send_out_req) {
11422                 sctp_add_stream_reset_out(chk, number_entries, list,
11423                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11424                 asoc->stream_reset_out_is_outstanding = 1;
11425                 seq++;
11426                 asoc->stream_reset_outstanding++;
11427         }
11428         if (add_stream) {
11429                 sctp_add_a_stream(chk, seq, adding);
11430                 seq++;
11431                 asoc->stream_reset_outstanding++;
11432         }
11433         if (send_in_req) {
11434                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11435                 asoc->stream_reset_outstanding++;
11436         }
11437         if (send_tsn_req) {
11438                 sctp_add_stream_reset_tsn(chk, seq);
11439                 asoc->stream_reset_outstanding++;
11440         }
11441         asoc->str_reset = chk;
11442
11443         /* insert the chunk for sending */
11444         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11445             chk,
11446             sctp_next);
11447         asoc->ctrl_queue_cnt++;
11448         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11449         return (0);
11450 }
11451
11452 void
11453 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11454     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11455 {
11456         /*-
11457          * Formulate the abort message, and send it back down.
11458          */
11459         struct mbuf *o_pak;
11460         struct mbuf *mout;
11461         struct sctp_abort_msg *abm;
11462         struct ip *iph, *iph_out;
11463         struct udphdr *udp;
11464
11465 #ifdef INET6
11466         struct ip6_hdr *ip6, *ip6_out;
11467
11468 #endif
11469         int iphlen_out, len;
11470
11471         /* don't respond to ABORT with ABORT */
11472         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11473                 if (err_cause)
11474                         sctp_m_freem(err_cause);
11475                 return;
11476         }
11477         iph = mtod(m, struct ip *);
11478         switch (iph->ip_v) {
11479         case IPVERSION:
11480                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11481                 break;
11482 #ifdef INET6
11483         case IPV6_VERSION >> 4:
11484                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11485                 break;
11486 #endif
11487         default:
11488                 if (err_cause) {
11489                         sctp_m_freem(err_cause);
11490                 }
11491                 return;
11492         }
11493         if (port) {
11494                 len += sizeof(struct udphdr);
11495         }
11496         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11497         if (mout == NULL) {
11498                 if (err_cause) {
11499                         sctp_m_freem(err_cause);
11500                 }
11501                 return;
11502         }
11503         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11504         SCTP_BUF_LEN(mout) = len;
11505         SCTP_BUF_NEXT(mout) = err_cause;
11506         iph_out = NULL;
11507 #ifdef INET6
11508         ip6_out = NULL;
11509 #endif
11510         switch (iph->ip_v) {
11511         case IPVERSION:
11512                 iph_out = mtod(mout, struct ip *);
11513
11514                 /* Fill in the IP header for the ABORT */
11515                 iph_out->ip_v = IPVERSION;
11516                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11517                 iph_out->ip_tos = (u_char)0;
11518                 iph_out->ip_id = 0;
11519                 iph_out->ip_off = 0;
11520                 iph_out->ip_ttl = MAXTTL;
11521                 if (port) {
11522                         iph_out->ip_p = IPPROTO_UDP;
11523                 } else {
11524                         iph_out->ip_p = IPPROTO_SCTP;
11525                 }
11526                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11527                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11528                 /* let IP layer calculate this */
11529                 iph_out->ip_sum = 0;
11530
11531                 iphlen_out = sizeof(*iph_out);
11532                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11533                 break;
11534 #ifdef INET6
11535         case IPV6_VERSION >> 4:
11536                 ip6 = (struct ip6_hdr *)iph;
11537                 ip6_out = mtod(mout, struct ip6_hdr *);
11538
11539                 /* Fill in the IP6 header for the ABORT */
11540                 ip6_out->ip6_flow = ip6->ip6_flow;
11541                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11542                 if (port) {
11543                         ip6_out->ip6_nxt = IPPROTO_UDP;
11544                 } else {
11545                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11546                 }
11547                 ip6_out->ip6_src = ip6->ip6_dst;
11548                 ip6_out->ip6_dst = ip6->ip6_src;
11549
11550                 iphlen_out = sizeof(*ip6_out);
11551                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11552                 break;
11553 #endif                          /* INET6 */
11554         default:
11555                 /* Currently not supported */
11556                 sctp_m_freem(mout);
11557                 return;
11558         }
11559
11560         udp = (struct udphdr *)abm;
11561         if (port) {
11562                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11563                 udp->uh_dport = port;
11564                 /* set udp->uh_ulen later */
11565                 udp->uh_sum = 0;
11566                 iphlen_out += sizeof(struct udphdr);
11567                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11568         }
11569         abm->sh.src_port = sh->dest_port;
11570         abm->sh.dest_port = sh->src_port;
11571         abm->sh.checksum = 0;
11572         if (vtag == 0) {
11573                 abm->sh.v_tag = sh->v_tag;
11574                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11575         } else {
11576                 abm->sh.v_tag = htonl(vtag);
11577                 abm->msg.ch.chunk_flags = 0;
11578         }
11579         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11580
11581         if (err_cause) {
11582                 struct mbuf *m_tmp = err_cause;
11583                 int err_len = 0;
11584
11585                 /* get length of the err_cause chain */
11586                 while (m_tmp != NULL) {
11587                         err_len += SCTP_BUF_LEN(m_tmp);
11588                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11589                 }
11590                 len = SCTP_BUF_LEN(mout) + err_len;
11591                 if (err_len % 4) {
11592                         /* need pad at end of chunk */
11593                         uint32_t cpthis = 0;
11594                         int padlen;
11595
11596                         padlen = 4 - (len % 4);
11597                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11598                         len += padlen;
11599                 }
11600                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11601         } else {
11602                 len = SCTP_BUF_LEN(mout);
11603                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11604         }
11605
11606         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11607                 /* no mbuf's */
11608                 sctp_m_freem(mout);
11609                 return;
11610         }
11611         if (iph_out != NULL) {
11612                 sctp_route_t ro;
11613                 int ret;
11614
11615                 /* zap the stack pointer to the route */
11616                 bzero(&ro, sizeof ro);
11617                 if (port) {
11618                         udp->uh_ulen = htons(len - sizeof(struct ip));
11619                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11620                 }
11621                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11622                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11623                 /* set IPv4 length */
11624                 iph_out->ip_len = len;
11625                 /* out it goes */
11626 #ifdef  SCTP_PACKET_LOGGING
11627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11628                         sctp_packet_log(mout, len);
11629 #endif
11630                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11631                 if (port) {
11632 #if defined(SCTP_WITH_NO_CSUM)
11633                         SCTP_STAT_INCR(sctps_sendnocrc);
11634 #else
11635                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11636                         SCTP_STAT_INCR(sctps_sendswcrc);
11637 #endif
11638                         SCTP_ENABLE_UDP_CSUM(o_pak);
11639                 } else {
11640 #if defined(SCTP_WITH_NO_CSUM)
11641                         SCTP_STAT_INCR(sctps_sendnocrc);
11642 #else
11643                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11644                         mout->m_pkthdr.csum_data = 0;
11645                         SCTP_STAT_INCR(sctps_sendhwcrc);
11646 #endif
11647                 }
11648                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11649
11650                 /* Free the route if we got one back */
11651                 if (ro.ro_rt)
11652                         RTFREE(ro.ro_rt);
11653         }
11654 #ifdef INET6
11655         if (ip6_out != NULL) {
11656                 struct route_in6 ro;
11657                 int ret;
11658                 struct ifnet *ifp = NULL;
11659
11660                 /* zap the stack pointer to the route */
11661                 bzero(&ro, sizeof(ro));
11662                 if (port) {
11663                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11664                 }
11665                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11666                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11667                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11668 #ifdef  SCTP_PACKET_LOGGING
11669                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11670                         sctp_packet_log(mout, len);
11671 #endif
11672                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11673                 if (port) {
11674 #if defined(SCTP_WITH_NO_CSUM)
11675                         SCTP_STAT_INCR(sctps_sendnocrc);
11676 #else
11677                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11678                         SCTP_STAT_INCR(sctps_sendswcrc);
11679 #endif
11680                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11681                                 udp->uh_sum = 0xffff;
11682                         }
11683                 } else {
11684 #if defined(SCTP_WITH_NO_CSUM)
11685                         SCTP_STAT_INCR(sctps_sendnocrc);
11686 #else
11687                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11688                         mout->m_pkthdr.csum_data = 0;
11689                         SCTP_STAT_INCR(sctps_sendhwcrc);
11690 #endif
11691                 }
11692                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11693
11694                 /* Free the route if we got one back */
11695                 if (ro.ro_rt)
11696                         RTFREE(ro.ro_rt);
11697         }
11698 #endif
11699         SCTP_STAT_INCR(sctps_sendpackets);
11700         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11701         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11702 }
11703
11704 void
11705 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11706     uint32_t vrf_id, uint16_t port)
11707 {
11708         struct mbuf *o_pak;
11709         struct sctphdr *sh, *sh_out;
11710         struct sctp_chunkhdr *ch;
11711         struct ip *iph, *iph_out;
11712         struct udphdr *udp = NULL;
11713         struct mbuf *mout;
11714
11715 #ifdef INET6
11716         struct ip6_hdr *ip6, *ip6_out;
11717
11718 #endif
11719         int iphlen_out, len;
11720
11721         iph = mtod(m, struct ip *);
11722         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11723         switch (iph->ip_v) {
11724         case IPVERSION:
11725                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11726                 break;
11727 #ifdef INET6
11728         case IPV6_VERSION >> 4:
11729                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11730                 break;
11731 #endif
11732         default:
11733                 if (scm) {
11734                         sctp_m_freem(scm);
11735                 }
11736                 return;
11737         }
11738         if (port) {
11739                 len += sizeof(struct udphdr);
11740         }
11741         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11742         if (mout == NULL) {
11743                 if (scm) {
11744                         sctp_m_freem(scm);
11745                 }
11746                 return;
11747         }
11748         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11749         SCTP_BUF_LEN(mout) = len;
11750         SCTP_BUF_NEXT(mout) = scm;
11751         iph_out = NULL;
11752 #ifdef INET6
11753         ip6_out = NULL;
11754 #endif
11755         switch (iph->ip_v) {
11756         case IPVERSION:
11757                 iph_out = mtod(mout, struct ip *);
11758
11759                 /* Fill in the IP header for the ABORT */
11760                 iph_out->ip_v = IPVERSION;
11761                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11762                 iph_out->ip_tos = (u_char)0;
11763                 iph_out->ip_id = 0;
11764                 iph_out->ip_off = 0;
11765                 iph_out->ip_ttl = MAXTTL;
11766                 if (port) {
11767                         iph_out->ip_p = IPPROTO_UDP;
11768                 } else {
11769                         iph_out->ip_p = IPPROTO_SCTP;
11770                 }
11771                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11772                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11773                 /* let IP layer calculate this */
11774                 iph_out->ip_sum = 0;
11775
11776                 iphlen_out = sizeof(struct ip);
11777                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11778                 break;
11779 #ifdef INET6
11780         case IPV6_VERSION >> 4:
11781                 ip6 = (struct ip6_hdr *)iph;
11782                 ip6_out = mtod(mout, struct ip6_hdr *);
11783
11784                 /* Fill in the IP6 header for the ABORT */
11785                 ip6_out->ip6_flow = ip6->ip6_flow;
11786                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11787                 if (port) {
11788                         ip6_out->ip6_nxt = IPPROTO_UDP;
11789                 } else {
11790                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11791                 }
11792                 ip6_out->ip6_src = ip6->ip6_dst;
11793                 ip6_out->ip6_dst = ip6->ip6_src;
11794
11795                 iphlen_out = sizeof(struct ip6_hdr);
11796                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11797                 break;
11798 #endif                          /* INET6 */
11799         default:
11800                 /* Currently not supported */
11801                 sctp_m_freem(mout);
11802                 return;
11803         }
11804
11805         udp = (struct udphdr *)sh_out;
11806         if (port) {
11807                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11808                 udp->uh_dport = port;
11809                 /* set udp->uh_ulen later */
11810                 udp->uh_sum = 0;
11811                 iphlen_out += sizeof(struct udphdr);
11812                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11813         }
11814         sh_out->src_port = sh->dest_port;
11815         sh_out->dest_port = sh->src_port;
11816         sh_out->v_tag = vtag;
11817         sh_out->checksum = 0;
11818
11819         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11820         ch->chunk_type = SCTP_OPERATION_ERROR;
11821         ch->chunk_flags = 0;
11822
11823         if (scm) {
11824                 struct mbuf *m_tmp = scm;
11825                 int cause_len = 0;
11826
11827                 /* get length of the err_cause chain */
11828                 while (m_tmp != NULL) {
11829                         cause_len += SCTP_BUF_LEN(m_tmp);
11830                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11831                 }
11832                 len = SCTP_BUF_LEN(mout) + cause_len;
11833                 if (cause_len % 4) {
11834                         /* need pad at end of chunk */
11835                         uint32_t cpthis = 0;
11836                         int padlen;
11837
11838                         padlen = 4 - (len % 4);
11839                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11840                         len += padlen;
11841                 }
11842                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11843         } else {
11844                 len = SCTP_BUF_LEN(mout);
11845                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11846         }
11847
11848         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11849                 /* no mbuf's */
11850                 sctp_m_freem(mout);
11851                 return;
11852         }
11853         if (iph_out != NULL) {
11854                 sctp_route_t ro;
11855                 int ret;
11856
11857                 /* zap the stack pointer to the route */
11858                 bzero(&ro, sizeof ro);
11859                 if (port) {
11860                         udp->uh_ulen = htons(len - sizeof(struct ip));
11861                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11862                 }
11863                 /* set IPv4 length */
11864                 iph_out->ip_len = len;
11865                 /* out it goes */
11866 #ifdef  SCTP_PACKET_LOGGING
11867                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11868                         sctp_packet_log(mout, len);
11869 #endif
11870                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11871                 if (port) {
11872 #if defined(SCTP_WITH_NO_CSUM)
11873                         SCTP_STAT_INCR(sctps_sendnocrc);
11874 #else
11875                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11876                         SCTP_STAT_INCR(sctps_sendswcrc);
11877 #endif
11878                         SCTP_ENABLE_UDP_CSUM(o_pak);
11879                 } else {
11880 #if defined(SCTP_WITH_NO_CSUM)
11881                         SCTP_STAT_INCR(sctps_sendnocrc);
11882 #else
11883                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11884                         mout->m_pkthdr.csum_data = 0;
11885                         SCTP_STAT_INCR(sctps_sendhwcrc);
11886 #endif
11887                 }
11888                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11889
11890                 /* Free the route if we got one back */
11891                 if (ro.ro_rt)
11892                         RTFREE(ro.ro_rt);
11893         }
11894 #ifdef INET6
11895         if (ip6_out != NULL) {
11896                 struct route_in6 ro;
11897                 int ret;
11898                 struct ifnet *ifp = NULL;
11899
11900                 /* zap the stack pointer to the route */
11901                 bzero(&ro, sizeof(ro));
11902                 if (port) {
11903                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11904                 }
11905                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11906 #ifdef  SCTP_PACKET_LOGGING
11907                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11908                         sctp_packet_log(mout, len);
11909 #endif
11910                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11911                 if (port) {
11912 #if defined(SCTP_WITH_NO_CSUM)
11913                         SCTP_STAT_INCR(sctps_sendnocrc);
11914 #else
11915                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11916                         SCTP_STAT_INCR(sctps_sendswcrc);
11917 #endif
11918                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11919                                 udp->uh_sum = 0xffff;
11920                         }
11921                 } else {
11922 #if defined(SCTP_WITH_NO_CSUM)
11923                         SCTP_STAT_INCR(sctps_sendnocrc);
11924 #else
11925                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11926                         mout->m_pkthdr.csum_data = 0;
11927                         SCTP_STAT_INCR(sctps_sendhwcrc);
11928 #endif
11929                 }
11930                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11931
11932                 /* Free the route if we got one back */
11933                 if (ro.ro_rt)
11934                         RTFREE(ro.ro_rt);
11935         }
11936 #endif
11937         SCTP_STAT_INCR(sctps_sendpackets);
11938         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11939         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11940 }
11941
11942 static struct mbuf *
11943 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11944     struct uio *uio,
11945     struct sctp_sndrcvinfo *srcv,
11946     int max_send_len,
11947     int user_marks_eor,
11948     int *error,
11949     uint32_t * sndout,
11950     struct mbuf **new_tail)
11951 {
11952         struct mbuf *m;
11953
11954         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11955             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11956         if (m == NULL) {
11957                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11958                 *error = ENOMEM;
11959         } else {
11960                 *sndout = m_length(m, NULL);
11961                 *new_tail = m_last(m);
11962         }
11963         return (m);
11964 }
11965
11966 static int
11967 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11968     struct uio *uio,
11969     int resv_upfront)
11970 {
11971         int left;
11972
11973         left = sp->length;
11974         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11975             resv_upfront, 0);
11976         if (sp->data == NULL) {
11977                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11978                 return (ENOMEM);
11979         }
11980         sp->tail_mbuf = m_last(sp->data);
11981         return (0);
11982 }
11983
11984
11985
11986 static struct sctp_stream_queue_pending *
11987 sctp_copy_it_in(struct sctp_tcb *stcb,
11988     struct sctp_association *asoc,
11989     struct sctp_sndrcvinfo *srcv,
11990     struct uio *uio,
11991     struct sctp_nets *net,
11992     int max_send_len,
11993     int user_marks_eor,
11994     int *error,
11995     int non_blocking)
11996 {
11997         /*-
11998          * This routine must be very careful in its work. Protocol
11999          * processing is up and running so care must be taken to spl...()
12000          * when you need to do something that may effect the stcb/asoc. The
12001          * sb is locked however. When data is copied the protocol processing
12002          * should be enabled since this is a slower operation...
12003          */
12004         struct sctp_stream_queue_pending *sp = NULL;
12005         int resv_in_first;
12006
12007         *error = 0;
12008         /* Now can we send this? */
12009         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12010             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12011             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12012             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12013                 /* got data while shutting down */
12014                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12015                 *error = ECONNRESET;
12016                 goto out_now;
12017         }
12018         sctp_alloc_a_strmoq(stcb, sp);
12019         if (sp == NULL) {
12020                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12021                 *error = ENOMEM;
12022                 goto out_now;
12023         }
12024         sp->act_flags = 0;
12025         sp->sender_all_done = 0;
12026         sp->sinfo_flags = srcv->sinfo_flags;
12027         sp->timetolive = srcv->sinfo_timetolive;
12028         sp->ppid = srcv->sinfo_ppid;
12029         sp->context = srcv->sinfo_context;
12030         sp->strseq = 0;
12031         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12032
12033         sp->stream = srcv->sinfo_stream;
12034         sp->length = min(uio->uio_resid, max_send_len);
12035         if ((sp->length == (uint32_t) uio->uio_resid) &&
12036             ((user_marks_eor == 0) ||
12037             (srcv->sinfo_flags & SCTP_EOF) ||
12038             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12039                 sp->msg_is_complete = 1;
12040         } else {
12041                 sp->msg_is_complete = 0;
12042         }
12043         sp->sender_all_done = 0;
12044         sp->some_taken = 0;
12045         sp->put_last_out = 0;
12046         resv_in_first = sizeof(struct sctp_data_chunk);
12047         sp->data = sp->tail_mbuf = NULL;
12048         if (sp->length == 0) {
12049                 *error = 0;
12050                 goto skip_copy;
12051         }
12052         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12053         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12054                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12055                 sp->holds_key_ref = 1;
12056         }
12057         *error = sctp_copy_one(sp, uio, resv_in_first);
12058 skip_copy:
12059         if (*error) {
12060                 sctp_free_a_strmoq(stcb, sp);
12061                 sp = NULL;
12062         } else {
12063                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12064                         sp->net = net;
12065                         atomic_add_int(&sp->net->ref_count, 1);
12066                 } else {
12067                         sp->net = NULL;
12068                 }
12069                 sctp_set_prsctp_policy(sp);
12070         }
12071 out_now:
12072         return (sp);
12073 }
12074
12075
12076 int
12077 sctp_sosend(struct socket *so,
12078     struct sockaddr *addr,
12079     struct uio *uio,
12080     struct mbuf *top,
12081     struct mbuf *control,
12082     int flags,
12083     struct thread *p
12084 )
12085 {
12086         int error, use_rcvinfo = 0;
12087         struct sctp_sndrcvinfo srcv;
12088         struct sockaddr *addr_to_use;
12089
12090 #if defined(INET) && defined(INET6)
12091         struct sockaddr_in sin;
12092
12093 #endif
12094
12095         if (control) {
12096                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12097                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12098                     sizeof(srcv))) {
12099                         /* got one */
12100                         use_rcvinfo = 1;
12101                 }
12102         }
12103         addr_to_use = addr;
12104 #if defined(INET) && defined(INET6)
12105         if ((addr) && (addr->sa_family == AF_INET6)) {
12106                 struct sockaddr_in6 *sin6;
12107
12108                 sin6 = (struct sockaddr_in6 *)addr;
12109                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12110                         in6_sin6_2_sin(&sin, sin6);
12111                         addr_to_use = (struct sockaddr *)&sin;
12112                 }
12113         }
12114 #endif
12115         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12116             control,
12117             flags,
12118             use_rcvinfo ? &srcv : NULL
12119             ,p
12120             );
12121         return (error);
12122 }
12123
12124
12125 int
12126 sctp_lower_sosend(struct socket *so,
12127     struct sockaddr *addr,
12128     struct uio *uio,
12129     struct mbuf *i_pak,
12130     struct mbuf *control,
12131     int flags,
12132     struct sctp_sndrcvinfo *srcv
12133     ,
12134     struct thread *p
12135 )
12136 {
12137         unsigned int sndlen = 0, max_len;
12138         int error, len;
12139         struct mbuf *top = NULL;
12140         int queue_only = 0, queue_only_for_init = 0;
12141         int free_cnt_applied = 0;
12142         int un_sent;
12143         int now_filled = 0;
12144         unsigned int inqueue_bytes = 0;
12145         struct sctp_block_entry be;
12146         struct sctp_inpcb *inp;
12147         struct sctp_tcb *stcb = NULL;
12148         struct timeval now;
12149         struct sctp_nets *net;
12150         struct sctp_association *asoc;
12151         struct sctp_inpcb *t_inp;
12152         int user_marks_eor;
12153         int create_lock_applied = 0;
12154         int nagle_applies = 0;
12155         int some_on_control = 0;
12156         int got_all_of_the_send = 0;
12157         int hold_tcblock = 0;
12158         int non_blocking = 0;
12159         uint32_t local_add_more, local_soresv = 0;
12160         uint16_t port;
12161         uint16_t sinfo_flags;
12162         sctp_assoc_t sinfo_assoc_id;
12163
12164         error = 0;
12165         net = NULL;
12166         stcb = NULL;
12167         asoc = NULL;
12168
12169         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12170         if (inp == NULL) {
12171                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12172                 error = EINVAL;
12173                 if (i_pak) {
12174                         SCTP_RELEASE_PKT(i_pak);
12175                 }
12176                 return (error);
12177         }
12178         if ((uio == NULL) && (i_pak == NULL)) {
12179                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12180                 return (EINVAL);
12181         }
12182         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12183         atomic_add_int(&inp->total_sends, 1);
12184         if (uio) {
12185                 if (uio->uio_resid < 0) {
12186                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12187                         return (EINVAL);
12188                 }
12189                 sndlen = uio->uio_resid;
12190         } else {
12191                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12192                 sndlen = SCTP_HEADER_LEN(i_pak);
12193         }
12194         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12195             addr,
12196             sndlen);
12197         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12198             (inp->sctp_socket->so_qlimit)) {
12199                 /* The listener can NOT send */
12200                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12201                 error = ENOTCONN;
12202                 goto out_unlocked;
12203         }
12204         /**
12205          * Pre-screen address, if one is given the sin-len
12206          * must be set correctly!
12207          */
12208         if (addr) {
12209                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12210
12211                 switch (raddr->sa.sa_family) {
12212 #if defined(INET)
12213                 case AF_INET:
12214                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12215                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12216                                 error = EINVAL;
12217                                 goto out_unlocked;
12218                         }
12219                         port = raddr->sin.sin_port;
12220                         break;
12221 #endif
12222 #if defined(INET6)
12223                 case AF_INET6:
12224                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12225                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12226                                 error = EINVAL;
12227                                 goto out_unlocked;
12228                         }
12229                         port = raddr->sin6.sin6_port;
12230                         break;
12231 #endif
12232                 default:
12233                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12234                         error = EAFNOSUPPORT;
12235                         goto out_unlocked;
12236                 }
12237         } else
12238                 port = 0;
12239
12240         if (srcv) {
12241                 sinfo_flags = srcv->sinfo_flags;
12242                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12243                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12244                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12245                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12246                         error = EINVAL;
12247                         goto out_unlocked;
12248                 }
12249                 if (srcv->sinfo_flags)
12250                         SCTP_STAT_INCR(sctps_sends_with_flags);
12251         } else {
12252                 sinfo_flags = inp->def_send.sinfo_flags;
12253                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12254         }
12255         if (sinfo_flags & SCTP_SENDALL) {
12256                 /* its a sendall */
12257                 error = sctp_sendall(inp, uio, top, srcv);
12258                 top = NULL;
12259                 goto out_unlocked;
12260         }
12261         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12262                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12263                 error = EINVAL;
12264                 goto out_unlocked;
12265         }
12266         /* now we must find the assoc */
12267         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12268             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12269                 SCTP_INP_RLOCK(inp);
12270                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12271                 if (stcb == NULL) {
12272                         SCTP_INP_RUNLOCK(inp);
12273                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12274                         error = ENOTCONN;
12275                         goto out_unlocked;
12276                 }
12277                 SCTP_TCB_LOCK(stcb);
12278                 hold_tcblock = 1;
12279                 SCTP_INP_RUNLOCK(inp);
12280         } else if (sinfo_assoc_id) {
12281                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12282         } else if (addr) {
12283                 /*-
12284                  * Since we did not use findep we must
12285                  * increment it, and if we don't find a tcb
12286                  * decrement it.
12287                  */
12288                 SCTP_INP_WLOCK(inp);
12289                 SCTP_INP_INCR_REF(inp);
12290                 SCTP_INP_WUNLOCK(inp);
12291                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12292                 if (stcb == NULL) {
12293                         SCTP_INP_WLOCK(inp);
12294                         SCTP_INP_DECR_REF(inp);
12295                         SCTP_INP_WUNLOCK(inp);
12296                 } else {
12297                         hold_tcblock = 1;
12298                 }
12299         }
12300         if ((stcb == NULL) && (addr)) {
12301                 /* Possible implicit send? */
12302                 SCTP_ASOC_CREATE_LOCK(inp);
12303                 create_lock_applied = 1;
12304                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12305                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12306                         /* Should I really unlock ? */
12307                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12308                         error = EINVAL;
12309                         goto out_unlocked;
12310
12311                 }
12312                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12313                     (addr->sa_family == AF_INET6)) {
12314                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12315                         error = EINVAL;
12316                         goto out_unlocked;
12317                 }
12318                 SCTP_INP_WLOCK(inp);
12319                 SCTP_INP_INCR_REF(inp);
12320                 SCTP_INP_WUNLOCK(inp);
12321                 /* With the lock applied look again */
12322                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12323                 if (stcb == NULL) {
12324                         SCTP_INP_WLOCK(inp);
12325                         SCTP_INP_DECR_REF(inp);
12326                         SCTP_INP_WUNLOCK(inp);
12327                 } else {
12328                         hold_tcblock = 1;
12329                 }
12330                 if (t_inp != inp) {
12331                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12332                         error = ENOTCONN;
12333                         goto out_unlocked;
12334                 }
12335         }
12336         if (stcb == NULL) {
12337                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12338                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12339                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12340                         error = ENOTCONN;
12341                         goto out_unlocked;
12342                 }
12343                 if (addr == NULL) {
12344                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12345                         error = ENOENT;
12346                         goto out_unlocked;
12347                 } else {
12348                         /*
12349                          * UDP style, we must go ahead and start the INIT
12350                          * process
12351                          */
12352                         uint32_t vrf_id;
12353
12354                         if ((sinfo_flags & SCTP_ABORT) ||
12355                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12356                                 /*-
12357                                  * User asks to abort a non-existant assoc,
12358                                  * or EOF a non-existant assoc with no data
12359                                  */
12360                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12361                                 error = ENOENT;
12362                                 goto out_unlocked;
12363                         }
12364                         /* get an asoc/stcb struct */
12365                         vrf_id = inp->def_vrf_id;
12366 #ifdef INVARIANTS
12367                         if (create_lock_applied == 0) {
12368                                 panic("Error, should hold create lock and I don't?");
12369                         }
12370 #endif
12371                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12372                             p
12373                             );
12374                         if (stcb == NULL) {
12375                                 /* Error is setup for us in the call */
12376                                 goto out_unlocked;
12377                         }
12378                         if (create_lock_applied) {
12379                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12380                                 create_lock_applied = 0;
12381                         } else {
12382                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12383                         }
12384                         /*
12385                          * Turn on queue only flag to prevent data from
12386                          * being sent
12387                          */
12388                         queue_only = 1;
12389                         asoc = &stcb->asoc;
12390                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12391                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12392
12393                         /* initialize authentication params for the assoc */
12394                         sctp_initialize_auth_params(inp, stcb);
12395
12396                         if (control) {
12397                                 /*
12398                                  * see if a init structure exists in cmsg
12399                                  * headers
12400                                  */
12401                                 struct sctp_initmsg initm;
12402                                 int i;
12403
12404                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12405                                     sizeof(initm))) {
12406                                         /*
12407                                          * we have an INIT override of the
12408                                          * default
12409                                          */
12410                                         if (initm.sinit_max_attempts)
12411                                                 asoc->max_init_times = initm.sinit_max_attempts;
12412                                         if (initm.sinit_num_ostreams)
12413                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12414                                         if (initm.sinit_max_instreams)
12415                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12416                                         if (initm.sinit_max_init_timeo)
12417                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12418                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12419                                                 struct sctp_stream_out *tmp_str;
12420                                                 int had_lock = 0;
12421
12422                                                 /* Default is NOT correct */
12423                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12424                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12425                                                 /*
12426                                                  * What happens if this
12427                                                  * fails? we panic ...
12428                                                  */
12429
12430                                                 if (hold_tcblock) {
12431                                                         had_lock = 1;
12432                                                         SCTP_TCB_UNLOCK(stcb);
12433                                                 }
12434                                                 SCTP_MALLOC(tmp_str,
12435                                                     struct sctp_stream_out *,
12436                                                     (asoc->pre_open_streams *
12437                                                     sizeof(struct sctp_stream_out)),
12438                                                     SCTP_M_STRMO);
12439                                                 if (had_lock) {
12440                                                         SCTP_TCB_LOCK(stcb);
12441                                                 }
12442                                                 if (tmp_str != NULL) {
12443                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12444                                                         asoc->strmout = tmp_str;
12445                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12446                                                 } else {
12447                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12448                                                 }
12449                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12450                                                         /*-
12451                                                          * inbound side must be set
12452                                                          * to 0xffff, also NOTE when
12453                                                          * we get the INIT-ACK back
12454                                                          * (for INIT sender) we MUST
12455                                                          * reduce the count
12456                                                          * (streamoutcnt) but first
12457                                                          * check if we sent to any
12458                                                          * of the upper streams that
12459                                                          * were dropped (if some
12460                                                          * were). Those that were
12461                                                          * dropped must be notified
12462                                                          * to the upper layer as
12463                                                          * failed to send.
12464                                                          */
12465                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12466                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12467                                                         asoc->strmout[i].stream_no = i;
12468                                                         asoc->strmout[i].last_msg_incomplete = 0;
12469                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12470                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12471                                                 }
12472                                         }
12473                                 }
12474                         }
12475                         hold_tcblock = 1;
12476                         /* out with the INIT */
12477                         queue_only_for_init = 1;
12478                         /*-
12479                          * we may want to dig in after this call and adjust the MTU
12480                          * value. It defaulted to 1500 (constant) but the ro
12481                          * structure may now have an update and thus we may need to
12482                          * change it BEFORE we append the message.
12483                          */
12484                 }
12485         } else
12486                 asoc = &stcb->asoc;
12487         if (srcv == NULL)
12488                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12489         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12490                 if (addr)
12491                         net = sctp_findnet(stcb, addr);
12492                 else
12493                         net = NULL;
12494                 if ((net == NULL) ||
12495                     ((port != 0) && (port != stcb->rport))) {
12496                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12497                         error = EINVAL;
12498                         goto out_unlocked;
12499                 }
12500         } else {
12501                 net = stcb->asoc.primary_destination;
12502         }
12503         atomic_add_int(&stcb->total_sends, 1);
12504         /* Keep the stcb from being freed under our feet */
12505         atomic_add_int(&asoc->refcnt, 1);
12506         free_cnt_applied = 1;
12507
12508         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12509                 if (sndlen > asoc->smallest_mtu) {
12510                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12511                         error = EMSGSIZE;
12512                         goto out_unlocked;
12513                 }
12514         }
12515         if ((SCTP_SO_IS_NBIO(so)
12516             || (flags & MSG_NBIO)
12517             )) {
12518                 non_blocking = 1;
12519         }
12520         /* would we block? */
12521         if (non_blocking) {
12522                 if (hold_tcblock == 0) {
12523                         SCTP_TCB_LOCK(stcb);
12524                         hold_tcblock = 1;
12525                 }
12526                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12527                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12528                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12529                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12530                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12531                                 error = EMSGSIZE;
12532                         else
12533                                 error = EWOULDBLOCK;
12534                         goto out_unlocked;
12535                 }
12536                 stcb->asoc.sb_send_resv += sndlen;
12537                 SCTP_TCB_UNLOCK(stcb);
12538                 hold_tcblock = 0;
12539         } else {
12540                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12541         }
12542         local_soresv = sndlen;
12543         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12544                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12545                 error = ECONNRESET;
12546                 goto out_unlocked;
12547         }
12548         if (create_lock_applied) {
12549                 SCTP_ASOC_CREATE_UNLOCK(inp);
12550                 create_lock_applied = 0;
12551         }
12552         if (asoc->stream_reset_outstanding) {
12553                 /*
12554                  * Can't queue any data while stream reset is underway.
12555                  */
12556                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12557                 error = EAGAIN;
12558                 goto out_unlocked;
12559         }
12560         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12561             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12562                 queue_only = 1;
12563         }
12564         /* we are now done with all control */
12565         if (control) {
12566                 sctp_m_freem(control);
12567                 control = NULL;
12568         }
12569         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12570             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12571             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12572             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12573                 if (srcv->sinfo_flags & SCTP_ABORT) {
12574                         ;
12575                 } else {
12576                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12577                         error = ECONNRESET;
12578                         goto out_unlocked;
12579                 }
12580         }
12581         /* Ok, we will attempt a msgsnd :> */
12582         if (p) {
12583                 p->td_ru.ru_msgsnd++;
12584         }
12585         /* Are we aborting? */
12586         if (srcv->sinfo_flags & SCTP_ABORT) {
12587                 struct mbuf *mm;
12588                 int tot_demand, tot_out = 0, max_out;
12589
12590                 SCTP_STAT_INCR(sctps_sends_with_abort);
12591                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12592                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12593                         /* It has to be up before we abort */
12594                         /* how big is the user initiated abort? */
12595                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                         error = EINVAL;
12597                         goto out;
12598                 }
12599                 if (hold_tcblock) {
12600                         SCTP_TCB_UNLOCK(stcb);
12601                         hold_tcblock = 0;
12602                 }
12603                 if (top) {
12604                         struct mbuf *cntm = NULL;
12605
12606                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12607                         if (sndlen != 0) {
12608                                 cntm = top;
12609                                 while (cntm) {
12610                                         tot_out += SCTP_BUF_LEN(cntm);
12611                                         cntm = SCTP_BUF_NEXT(cntm);
12612                                 }
12613                         }
12614                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12615                 } else {
12616                         /* Must fit in a MTU */
12617                         tot_out = sndlen;
12618                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12619                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12620                                 /* To big */
12621                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12622                                 error = EMSGSIZE;
12623                                 goto out;
12624                         }
12625                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12626                 }
12627                 if (mm == NULL) {
12628                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12629                         error = ENOMEM;
12630                         goto out;
12631                 }
12632                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12633                 max_out -= sizeof(struct sctp_abort_msg);
12634                 if (tot_out > max_out) {
12635                         tot_out = max_out;
12636                 }
12637                 if (mm) {
12638                         struct sctp_paramhdr *ph;
12639
12640                         /* now move forward the data pointer */
12641                         ph = mtod(mm, struct sctp_paramhdr *);
12642                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12643                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12644                         ph++;
12645                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12646                         if (top == NULL) {
12647                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12648                                 if (error) {
12649                                         /*-
12650                                          * Here if we can't get his data we
12651                                          * still abort we just don't get to
12652                                          * send the users note :-0
12653                                          */
12654                                         sctp_m_freem(mm);
12655                                         mm = NULL;
12656                                 }
12657                         } else {
12658                                 if (sndlen != 0) {
12659                                         SCTP_BUF_NEXT(mm) = top;
12660                                 }
12661                         }
12662                 }
12663                 if (hold_tcblock == 0) {
12664                         SCTP_TCB_LOCK(stcb);
12665                         hold_tcblock = 1;
12666                 }
12667                 atomic_add_int(&stcb->asoc.refcnt, -1);
12668                 free_cnt_applied = 0;
12669                 /* release this lock, otherwise we hang on ourselves */
12670                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12671                     SCTP_RESPONSE_TO_USER_REQ,
12672                     mm, SCTP_SO_LOCKED);
12673                 /* now relock the stcb so everything is sane */
12674                 hold_tcblock = 0;
12675                 stcb = NULL;
12676                 /*
12677                  * In this case top is already chained to mm avoid double
12678                  * free, since we free it below if top != NULL and driver
12679                  * would free it after sending the packet out
12680                  */
12681                 if (sndlen != 0) {
12682                         top = NULL;
12683                 }
12684                 goto out_unlocked;
12685         }
12686         /* Calculate the maximum we can send */
12687         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12688         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12689                 if (non_blocking) {
12690                         /* we already checked for non-blocking above. */
12691                         max_len = sndlen;
12692                 } else {
12693                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12694                 }
12695         } else {
12696                 max_len = 0;
12697         }
12698         if (hold_tcblock) {
12699                 SCTP_TCB_UNLOCK(stcb);
12700                 hold_tcblock = 0;
12701         }
12702         /* Is the stream no. valid? */
12703         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12704                 /* Invalid stream number */
12705                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12706                 error = EINVAL;
12707                 goto out_unlocked;
12708         }
12709         if (asoc->strmout == NULL) {
12710                 /* huh? software error */
12711                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12712                 error = EFAULT;
12713                 goto out_unlocked;
12714         }
12715         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12716         if ((user_marks_eor == 0) &&
12717             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12718                 /* It will NEVER fit */
12719                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12720                 error = EMSGSIZE;
12721                 goto out_unlocked;
12722         }
12723         if ((uio == NULL) && user_marks_eor) {
12724                 /*-
12725                  * We do not support eeor mode for
12726                  * sending with mbuf chains (like sendfile).
12727                  */
12728                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12729                 error = EINVAL;
12730                 goto out_unlocked;
12731         }
12732         if (user_marks_eor) {
12733                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12734         } else {
12735                 /*-
12736                  * For non-eeor the whole message must fit in
12737                  * the socket send buffer.
12738                  */
12739                 local_add_more = sndlen;
12740         }
12741         len = 0;
12742         if (non_blocking) {
12743                 goto skip_preblock;
12744         }
12745         if (((max_len <= local_add_more) &&
12746             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12747             (max_len == 0) ||
12748             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12749                 /* No room right now ! */
12750                 SOCKBUF_LOCK(&so->so_snd);
12751                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12752                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12753                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12754                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12755                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12756                             inqueue_bytes,
12757                             local_add_more,
12758                             stcb->asoc.stream_queue_cnt,
12759                             stcb->asoc.chunks_on_out_queue,
12760                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12761                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12762                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12763                         }
12764                         be.error = 0;
12765                         stcb->block_entry = &be;
12766                         error = sbwait(&so->so_snd);
12767                         stcb->block_entry = NULL;
12768                         if (error || so->so_error || be.error) {
12769                                 if (error == 0) {
12770                                         if (so->so_error)
12771                                                 error = so->so_error;
12772                                         if (be.error) {
12773                                                 error = be.error;
12774                                         }
12775                                 }
12776                                 SOCKBUF_UNLOCK(&so->so_snd);
12777                                 goto out_unlocked;
12778                         }
12779                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12780                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12781                                     so, asoc, stcb->asoc.total_output_queue_size);
12782                         }
12783                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12784                                 goto out_unlocked;
12785                         }
12786                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12787                 }
12788                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12789                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12790                 } else {
12791                         max_len = 0;
12792                 }
12793                 SOCKBUF_UNLOCK(&so->so_snd);
12794         }
12795 skip_preblock:
12796         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12797                 goto out_unlocked;
12798         }
12799         /*
12800          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12801          * case NOTE: uio will be null when top/mbuf is passed
12802          */
12803         if (sndlen == 0) {
12804                 if (srcv->sinfo_flags & SCTP_EOF) {
12805                         got_all_of_the_send = 1;
12806                         goto dataless_eof;
12807                 } else {
12808                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12809                         error = EINVAL;
12810                         goto out;
12811                 }
12812         }
12813         if (top == NULL) {
12814                 struct sctp_stream_queue_pending *sp;
12815                 struct sctp_stream_out *strm;
12816                 uint32_t sndout;
12817
12818                 SCTP_TCB_SEND_LOCK(stcb);
12819                 if ((asoc->stream_locked) &&
12820                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12821                         SCTP_TCB_SEND_UNLOCK(stcb);
12822                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12823                         error = EINVAL;
12824                         goto out;
12825                 }
12826                 SCTP_TCB_SEND_UNLOCK(stcb);
12827
12828                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12829                 if (strm->last_msg_incomplete == 0) {
12830         do_a_copy_in:
12831                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12832                         if ((sp == NULL) || (error)) {
12833                                 goto out;
12834                         }
12835                         SCTP_TCB_SEND_LOCK(stcb);
12836                         if (sp->msg_is_complete) {
12837                                 strm->last_msg_incomplete = 0;
12838                                 asoc->stream_locked = 0;
12839                         } else {
12840                                 /*
12841                                  * Just got locked to this guy in case of an
12842                                  * interrupt.
12843                                  */
12844                                 strm->last_msg_incomplete = 1;
12845                                 asoc->stream_locked = 1;
12846                                 asoc->stream_locked_on = srcv->sinfo_stream;
12847                                 sp->sender_all_done = 0;
12848                         }
12849                         sctp_snd_sb_alloc(stcb, sp->length);
12850                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12851                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12852                                 sp->strseq = strm->next_sequence_sent;
12853                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12854                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12855                                             (uintptr_t) stcb, sp->length,
12856                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12857                                 }
12858                                 strm->next_sequence_sent++;
12859                         } else {
12860                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12861                         }
12862                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12863                         if ((strm->next_spoke.tqe_next == NULL) &&
12864                             (strm->next_spoke.tqe_prev == NULL)) {
12865                                 /* Not on wheel, insert */
12866                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12867                         }
12868                         SCTP_TCB_SEND_UNLOCK(stcb);
12869                 } else {
12870                         SCTP_TCB_SEND_LOCK(stcb);
12871                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12872                         SCTP_TCB_SEND_UNLOCK(stcb);
12873                         if (sp == NULL) {
12874                                 /* ???? Huh ??? last msg is gone */
12875 #ifdef INVARIANTS
12876                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12877 #else
12878                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12879                                 strm->last_msg_incomplete = 0;
12880 #endif
12881                                 goto do_a_copy_in;
12882
12883                         }
12884                 }
12885                 while (uio->uio_resid > 0) {
12886                         /* How much room do we have? */
12887                         struct mbuf *new_tail, *mm;
12888
12889                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12890                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12891                         else
12892                                 max_len = 0;
12893
12894                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12895                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12896                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12897                                 sndout = 0;
12898                                 new_tail = NULL;
12899                                 if (hold_tcblock) {
12900                                         SCTP_TCB_UNLOCK(stcb);
12901                                         hold_tcblock = 0;
12902                                 }
12903                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12904                                 if ((mm == NULL) || error) {
12905                                         if (mm) {
12906                                                 sctp_m_freem(mm);
12907                                         }
12908                                         goto out;
12909                                 }
12910                                 /* Update the mbuf and count */
12911                                 SCTP_TCB_SEND_LOCK(stcb);
12912                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12913                                         /*
12914                                          * we need to get out. Peer probably
12915                                          * aborted.
12916                                          */
12917                                         sctp_m_freem(mm);
12918                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12919                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12920                                                 error = ECONNRESET;
12921                                         }
12922                                         SCTP_TCB_SEND_UNLOCK(stcb);
12923                                         goto out;
12924                                 }
12925                                 if (sp->tail_mbuf) {
12926                                         /* tack it to the end */
12927                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12928                                         sp->tail_mbuf = new_tail;
12929                                 } else {
12930                                         /* A stolen mbuf */
12931                                         sp->data = mm;
12932                                         sp->tail_mbuf = new_tail;
12933                                 }
12934                                 sctp_snd_sb_alloc(stcb, sndout);
12935                                 atomic_add_int(&sp->length, sndout);
12936                                 len += sndout;
12937
12938                                 /* Did we reach EOR? */
12939                                 if ((uio->uio_resid == 0) &&
12940                                     ((user_marks_eor == 0) ||
12941                                     (srcv->sinfo_flags & SCTP_EOF) ||
12942                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12943                                         sp->msg_is_complete = 1;
12944                                 } else {
12945                                         sp->msg_is_complete = 0;
12946                                 }
12947                                 SCTP_TCB_SEND_UNLOCK(stcb);
12948                         }
12949                         if (uio->uio_resid == 0) {
12950                                 /* got it all? */
12951                                 continue;
12952                         }
12953                         /* PR-SCTP? */
12954                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12955                                 /*
12956                                  * This is ugly but we must assure locking
12957                                  * order
12958                                  */
12959                                 if (hold_tcblock == 0) {
12960                                         SCTP_TCB_LOCK(stcb);
12961                                         hold_tcblock = 1;
12962                                 }
12963                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12964                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12965                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12966                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12967                                 else
12968                                         max_len = 0;
12969                                 if (max_len > 0) {
12970                                         continue;
12971                                 }
12972                                 SCTP_TCB_UNLOCK(stcb);
12973                                 hold_tcblock = 0;
12974                         }
12975                         /* wait for space now */
12976                         if (non_blocking) {
12977                                 /* Non-blocking io in place out */
12978                                 goto skip_out_eof;
12979                         }
12980                         /* What about the INIT, send it maybe */
12981                         if (queue_only_for_init) {
12982                                 if (hold_tcblock == 0) {
12983                                         SCTP_TCB_LOCK(stcb);
12984                                         hold_tcblock = 1;
12985                                 }
12986                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12987                                         /* a collision took us forward? */
12988                                         queue_only = 0;
12989                                 } else {
12990                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12991                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12992                                         queue_only = 1;
12993                                 }
12994                         }
12995                         if ((net->flight_size > net->cwnd) &&
12996                             (asoc->sctp_cmt_on_off == 0)) {
12997                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12998                                 queue_only = 1;
12999                         } else if (asoc->ifp_had_enobuf) {
13000                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13001                                 if (net->flight_size > (2 * net->mtu)) {
13002                                         queue_only = 1;
13003                                 }
13004                                 asoc->ifp_had_enobuf = 0;
13005                         }
13006                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13007                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13008                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13009                             (stcb->asoc.total_flight > 0) &&
13010                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13011                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13012
13013                                 /*-
13014                                  * Ok, Nagle is set on and we have data outstanding.
13015                                  * Don't send anything and let SACKs drive out the
13016                                  * data unless wen have a "full" segment to send.
13017                                  */
13018                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13019                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13020                                 }
13021                                 SCTP_STAT_INCR(sctps_naglequeued);
13022                                 nagle_applies = 1;
13023                         } else {
13024                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13025                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13026                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13027                                 }
13028                                 SCTP_STAT_INCR(sctps_naglesent);
13029                                 nagle_applies = 0;
13030                         }
13031                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13032
13033                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13034                                     nagle_applies, un_sent);
13035                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13036                                     stcb->asoc.total_flight,
13037                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13038                         }
13039                         if (queue_only_for_init)
13040                                 queue_only_for_init = 0;
13041                         if ((queue_only == 0) && (nagle_applies == 0)) {
13042                                 /*-
13043                                  * need to start chunk output
13044                                  * before blocking.. note that if
13045                                  * a lock is already applied, then
13046                                  * the input via the net is happening
13047                                  * and I don't need to start output :-D
13048                                  */
13049                                 if (hold_tcblock == 0) {
13050                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13051                                                 hold_tcblock = 1;
13052                                                 sctp_chunk_output(inp,
13053                                                     stcb,
13054                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13055                                         }
13056                                 } else {
13057                                         sctp_chunk_output(inp,
13058                                             stcb,
13059                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13060                                 }
13061                                 if (hold_tcblock == 1) {
13062                                         SCTP_TCB_UNLOCK(stcb);
13063                                         hold_tcblock = 0;
13064                                 }
13065                         }
13066                         SOCKBUF_LOCK(&so->so_snd);
13067                         /*-
13068                          * This is a bit strange, but I think it will
13069                          * work. The total_output_queue_size is locked and
13070                          * protected by the TCB_LOCK, which we just released.
13071                          * There is a race that can occur between releasing it
13072                          * above, and me getting the socket lock, where sacks
13073                          * come in but we have not put the SB_WAIT on the
13074                          * so_snd buffer to get the wakeup. After the LOCK
13075                          * is applied the sack_processing will also need to
13076                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13077                          * once we have the socket buffer lock if we recheck the
13078                          * size we KNOW we will get to sleep safely with the
13079                          * wakeup flag in place.
13080                          */
13081                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13082                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13083                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13084                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13085                                             so, asoc, uio->uio_resid);
13086                                 }
13087                                 be.error = 0;
13088                                 stcb->block_entry = &be;
13089                                 error = sbwait(&so->so_snd);
13090                                 stcb->block_entry = NULL;
13091
13092                                 if (error || so->so_error || be.error) {
13093                                         if (error == 0) {
13094                                                 if (so->so_error)
13095                                                         error = so->so_error;
13096                                                 if (be.error) {
13097                                                         error = be.error;
13098                                                 }
13099                                         }
13100                                         SOCKBUF_UNLOCK(&so->so_snd);
13101                                         goto out_unlocked;
13102                                 }
13103                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13104                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13105                                             so, asoc, stcb->asoc.total_output_queue_size);
13106                                 }
13107                         }
13108                         SOCKBUF_UNLOCK(&so->so_snd);
13109                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13110                                 goto out_unlocked;
13111                         }
13112                 }
13113                 SCTP_TCB_SEND_LOCK(stcb);
13114                 if (sp) {
13115                         if (sp->msg_is_complete == 0) {
13116                                 strm->last_msg_incomplete = 1;
13117                                 asoc->stream_locked = 1;
13118                                 asoc->stream_locked_on = srcv->sinfo_stream;
13119                         } else {
13120                                 sp->sender_all_done = 1;
13121                                 strm->last_msg_incomplete = 0;
13122                                 asoc->stream_locked = 0;
13123                         }
13124                 } else {
13125                         SCTP_PRINTF("Huh no sp TSNH?\n");
13126                         strm->last_msg_incomplete = 0;
13127                         asoc->stream_locked = 0;
13128                 }
13129                 SCTP_TCB_SEND_UNLOCK(stcb);
13130                 if (uio->uio_resid == 0) {
13131                         got_all_of_the_send = 1;
13132                 }
13133         } else {
13134                 /* We send in a 0, since we do NOT have any locks */
13135                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13136                 top = NULL;
13137                 if (srcv->sinfo_flags & SCTP_EOF) {
13138                         /*
13139                          * This should only happen for Panda for the mbuf
13140                          * send case, which does NOT yet support EEOR mode.
13141                          * Thus, we can just set this flag to do the proper
13142                          * EOF handling.
13143                          */
13144                         got_all_of_the_send = 1;
13145                 }
13146         }
13147         if (error) {
13148                 goto out;
13149         }
13150 dataless_eof:
13151         /* EOF thing ? */
13152         if ((srcv->sinfo_flags & SCTP_EOF) &&
13153             (got_all_of_the_send == 1) &&
13154             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13155                 int cnt;
13156
13157                 SCTP_STAT_INCR(sctps_sends_with_eof);
13158                 error = 0;
13159                 if (hold_tcblock == 0) {
13160                         SCTP_TCB_LOCK(stcb);
13161                         hold_tcblock = 1;
13162                 }
13163                 cnt = sctp_is_there_unsent_data(stcb);
13164                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13165                     TAILQ_EMPTY(&asoc->sent_queue) &&
13166                     (cnt == 0)) {
13167                         if (asoc->locked_on_sending) {
13168                                 goto abort_anyway;
13169                         }
13170                         /* there is nothing queued to send, so I'm done... */
13171                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13172                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13173                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13174                                 /* only send SHUTDOWN the first time through */
13175                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13176                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13177                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13178                                 }
13179                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13180                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13181                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13182                                     asoc->primary_destination);
13183                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13184                                     asoc->primary_destination);
13185                         }
13186                 } else {
13187                         /*-
13188                          * we still got (or just got) data to send, so set
13189                          * SHUTDOWN_PENDING
13190                          */
13191                         /*-
13192                          * XXX sockets draft says that SCTP_EOF should be
13193                          * sent with no data.  currently, we will allow user
13194                          * data to be sent first and move to
13195                          * SHUTDOWN-PENDING
13196                          */
13197                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13198                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13199                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13200                                 if (hold_tcblock == 0) {
13201                                         SCTP_TCB_LOCK(stcb);
13202                                         hold_tcblock = 1;
13203                                 }
13204                                 if (asoc->locked_on_sending) {
13205                                         /* Locked to send out the data */
13206                                         struct sctp_stream_queue_pending *sp;
13207
13208                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13209                                         if (sp) {
13210                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13211                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13212                                         }
13213                                 }
13214                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13215                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13216                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13217                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13218                         abort_anyway:
13219                                         if (free_cnt_applied) {
13220                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13221                                                 free_cnt_applied = 0;
13222                                         }
13223                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13224                                             SCTP_RESPONSE_TO_USER_REQ,
13225                                             NULL, SCTP_SO_LOCKED);
13226                                         /*
13227                                          * now relock the stcb so everything
13228                                          * is sane
13229                                          */
13230                                         hold_tcblock = 0;
13231                                         stcb = NULL;
13232                                         goto out;
13233                                 }
13234                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13235                                     asoc->primary_destination);
13236                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13237                         }
13238                 }
13239         }
13240 skip_out_eof:
13241         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13242                 some_on_control = 1;
13243         }
13244         if (queue_only_for_init) {
13245                 if (hold_tcblock == 0) {
13246                         SCTP_TCB_LOCK(stcb);
13247                         hold_tcblock = 1;
13248                 }
13249                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13250                         /* a collision took us forward? */
13251                         queue_only = 0;
13252                 } else {
13253                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13254                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13255                         queue_only = 1;
13256                 }
13257         }
13258         if ((net->flight_size > net->cwnd) &&
13259             (stcb->asoc.sctp_cmt_on_off == 0)) {
13260                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13261                 queue_only = 1;
13262         } else if (asoc->ifp_had_enobuf) {
13263                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13264                 if (net->flight_size > (2 * net->mtu)) {
13265                         queue_only = 1;
13266                 }
13267                 asoc->ifp_had_enobuf = 0;
13268         }
13269         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13270             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13271         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13272             (stcb->asoc.total_flight > 0) &&
13273             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13274             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13275                 /*-
13276                  * Ok, Nagle is set on and we have data outstanding.
13277                  * Don't send anything and let SACKs drive out the
13278                  * data unless wen have a "full" segment to send.
13279                  */
13280                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13281                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13282                 }
13283                 SCTP_STAT_INCR(sctps_naglequeued);
13284                 nagle_applies = 1;
13285         } else {
13286                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13287                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13288                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13289                 }
13290                 SCTP_STAT_INCR(sctps_naglesent);
13291                 nagle_applies = 0;
13292         }
13293         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13294                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13295                     nagle_applies, un_sent);
13296                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13297                     stcb->asoc.total_flight,
13298                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13299         }
13300         if (queue_only_for_init)
13301                 queue_only_for_init = 0;
13302         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13303                 /* we can attempt to send too. */
13304                 if (hold_tcblock == 0) {
13305                         /*
13306                          * If there is activity recv'ing sacks no need to
13307                          * send
13308                          */
13309                         if (SCTP_TCB_TRYLOCK(stcb)) {
13310                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13311                                 hold_tcblock = 1;
13312                         }
13313                 } else {
13314                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13315                 }
13316         } else if ((queue_only == 0) &&
13317                     (stcb->asoc.peers_rwnd == 0) &&
13318             (stcb->asoc.total_flight == 0)) {
13319                 /* We get to have a probe outstanding */
13320                 if (hold_tcblock == 0) {
13321                         hold_tcblock = 1;
13322                         SCTP_TCB_LOCK(stcb);
13323                 }
13324                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13325         } else if (some_on_control) {
13326                 int num_out, reason, frag_point;
13327
13328                 /* Here we do control only */
13329                 if (hold_tcblock == 0) {
13330                         hold_tcblock = 1;
13331                         SCTP_TCB_LOCK(stcb);
13332                 }
13333                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13334                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13335                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13336         }
13337         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13338             queue_only, stcb->asoc.peers_rwnd, un_sent,
13339             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13340             stcb->asoc.total_output_queue_size, error);
13341
13342 out:
13343 out_unlocked:
13344
13345         if (local_soresv && stcb) {
13346                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13347                 local_soresv = 0;
13348         }
13349         if (create_lock_applied) {
13350                 SCTP_ASOC_CREATE_UNLOCK(inp);
13351                 create_lock_applied = 0;
13352         }
13353         if ((stcb) && hold_tcblock) {
13354                 SCTP_TCB_UNLOCK(stcb);
13355         }
13356         if (stcb && free_cnt_applied) {
13357                 atomic_add_int(&stcb->asoc.refcnt, -1);
13358         }
13359 #ifdef INVARIANTS
13360         if (stcb) {
13361                 if (mtx_owned(&stcb->tcb_mtx)) {
13362                         panic("Leaving with tcb mtx owned?");
13363                 }
13364                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13365                         panic("Leaving with tcb send mtx owned?");
13366                 }
13367         }
13368 #endif
13369 #ifdef INVARIANTS
13370         if (inp) {
13371                 sctp_validate_no_locks(inp);
13372         } else {
13373                 printf("Warning - inp is NULL so cant validate locks\n");
13374         }
13375 #endif
13376         if (top) {
13377                 sctp_m_freem(top);
13378         }
13379         if (control) {
13380                 sctp_m_freem(control);
13381         }
13382         return (error);
13383 }
13384
13385
13386 /*
13387  * generate an AUTHentication chunk, if required
13388  */
13389 struct mbuf *
13390 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13391     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13392     struct sctp_tcb *stcb, uint8_t chunk)
13393 {
13394         struct mbuf *m_auth;
13395         struct sctp_auth_chunk *auth;
13396         int chunk_len;
13397
13398         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13399             (stcb == NULL))
13400                 return (m);
13401
13402         /* sysctl disabled auth? */
13403         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13404                 return (m);
13405
13406         /* peer doesn't do auth... */
13407         if (!stcb->asoc.peer_supports_auth) {
13408                 return (m);
13409         }
13410         /* does the requested chunk require auth? */
13411         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13412                 return (m);
13413         }
13414         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13415         if (m_auth == NULL) {
13416                 /* no mbuf's */
13417                 return (m);
13418         }
13419         /* reserve some space if this will be the first mbuf */
13420         if (m == NULL)
13421                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13422         /* fill in the AUTH chunk details */
13423         auth = mtod(m_auth, struct sctp_auth_chunk *);
13424         bzero(auth, sizeof(*auth));
13425         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13426         auth->ch.chunk_flags = 0;
13427         chunk_len = sizeof(*auth) +
13428             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13429         auth->ch.chunk_length = htons(chunk_len);
13430         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13431         /* key id and hmac digest will be computed and filled in upon send */
13432
13433         /* save the offset where the auth was inserted into the chain */
13434         if (m != NULL) {
13435                 struct mbuf *cn;
13436
13437                 *offset = 0;
13438                 cn = m;
13439                 while (cn) {
13440                         *offset += SCTP_BUF_LEN(cn);
13441                         cn = SCTP_BUF_NEXT(cn);
13442                 }
13443         } else
13444                 *offset = 0;
13445
13446         /* update length and return pointer to the auth chunk */
13447         SCTP_BUF_LEN(m_auth) = chunk_len;
13448         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13449         if (auth_ret != NULL)
13450                 *auth_ret = auth;
13451
13452         return (m);
13453 }
13454
13455 #ifdef INET6
13456 int
13457 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13458 {
13459         struct nd_prefix *pfx = NULL;
13460         struct nd_pfxrouter *pfxrtr = NULL;
13461         struct sockaddr_in6 gw6;
13462
13463         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13464                 return (0);
13465
13466         /* get prefix entry of address */
13467         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13468                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13469                         continue;
13470                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13471                     &src6->sin6_addr, &pfx->ndpr_mask))
13472                         break;
13473         }
13474         /* no prefix entry in the prefix list */
13475         if (pfx == NULL) {
13476                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13477                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13478                 return (0);
13479         }
13480         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13481         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13482
13483         /* search installed gateway from prefix entry */
13484         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13485             pfxrtr->pfr_next) {
13486                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13487                 gw6.sin6_family = AF_INET6;
13488                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13489                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13490                     sizeof(struct in6_addr));
13491                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13492                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13493                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13494                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13495                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13496                     ro->ro_rt->rt_gateway)) {
13497                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13498                         return (1);
13499                 }
13500         }
13501         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13502         return (0);
13503 }
13504
13505 #endif
13506
13507 int
13508 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13509 {
13510         struct sockaddr_in *sin, *mask;
13511         struct ifaddr *ifa;
13512         struct in_addr srcnetaddr, gwnetaddr;
13513
13514         if (ro == NULL || ro->ro_rt == NULL ||
13515             sifa->address.sa.sa_family != AF_INET) {
13516                 return (0);
13517         }
13518         ifa = (struct ifaddr *)sifa->ifa;
13519         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13520         sin = (struct sockaddr_in *)&sifa->address.sin;
13521         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13522         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13523         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13524         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13525
13526         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13527         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13528         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13529         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13530         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13531         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13532                 return (1);
13533         }
13534         return (0);
13535 }