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