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          * ----------------------------------------- src    |  dest | result
2194          * ---------------------------------------- L     |    L  |    yes
2195          * ----------------------------------------- P     |    L  |
2196          * yes-v4 no-v6 ----------------------------------------- G     |
2197          * L  |    yes-v4 no-v6 ----------------------------------------- L
2198          * |    P  |    no ----------------------------------------- P     |
2199          * P  |    yes ----------------------------------------- G     |
2200          * P  |    no ----------------------------------------- L     |    G
2201          * |    no ----------------------------------------- P     |    G  |
2202          * no ----------------------------------------- G     |    G  |
2203          * yes -----------------------------------------
2204          */
2205
2206         if (ifa->address.sa.sa_family != fam) {
2207                 /* forget mis-matched family */
2208                 return (NULL);
2209         }
2210         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2211                 dest_is_global = 1;
2212         }
2213         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2214         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2215         /* Ok the address may be ok */
2216         if (fam == AF_INET6) {
2217                 /* ok to use deprecated addresses? no lets not! */
2218                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2219                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2220                         return (NULL);
2221                 }
2222                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2223                         if (dest_is_loop) {
2224                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2225                                 return (NULL);
2226                         }
2227                 }
2228                 if (ifa->src_is_glob) {
2229                         if (dest_is_loop) {
2230                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2231                                 return (NULL);
2232                         }
2233                 }
2234         }
2235         /*
2236          * Now that we know what is what, implement or table this could in
2237          * theory be done slicker (it used to be), but this is
2238          * straightforward and easier to validate :-)
2239          */
2240         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2241             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2242         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2243             dest_is_loop, dest_is_priv, dest_is_global);
2244
2245         if ((ifa->src_is_loop) && (dest_is_priv)) {
2246                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2247                 return (NULL);
2248         }
2249         if ((ifa->src_is_glob) && (dest_is_priv)) {
2250                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2251                 return (NULL);
2252         }
2253         if ((ifa->src_is_loop) && (dest_is_global)) {
2254                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2255                 return (NULL);
2256         }
2257         if ((ifa->src_is_priv) && (dest_is_global)) {
2258                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2259                 return (NULL);
2260         }
2261         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2262         /* its a preferred address */
2263         return (ifa);
2264 }
2265
2266 static struct sctp_ifa *
2267 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2268     uint8_t dest_is_loop,
2269     uint8_t dest_is_priv,
2270     sa_family_t fam)
2271 {
2272         uint8_t dest_is_global = 0;
2273
2274
2275         /*
2276          * Here we determine if its a acceptable address. A acceptable
2277          * address means it is the same scope or higher scope but we can
2278          * allow for NAT which means its ok to have a global dest and a
2279          * private src.
2280          *
2281          * L = loopback, P = private, G = global
2282          * ----------------------------------------- src    |  dest | result
2283          * ----------------------------------------- L     |   L   |    yes
2284          * ----------------------------------------- P     |   L   |
2285          * yes-v4 no-v6 ----------------------------------------- G     |
2286          * L   |    yes ----------------------------------------- L     |
2287          * P   |    no ----------------------------------------- P     |   P
2288          * |    yes ----------------------------------------- G     |   P
2289          * |    yes - May not work -----------------------------------------
2290          * L     |   G   |    no ----------------------------------------- P
2291          * |   G   |    yes - May not work
2292          * ----------------------------------------- G     |   G   |    yes
2293          * -----------------------------------------
2294          */
2295
2296         if (ifa->address.sa.sa_family != fam) {
2297                 /* forget non matching family */
2298                 return (NULL);
2299         }
2300         /* Ok the address may be ok */
2301         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2302                 dest_is_global = 1;
2303         }
2304         if (fam == AF_INET6) {
2305                 /* ok to use deprecated addresses? */
2306                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2307                         return (NULL);
2308                 }
2309                 if (ifa->src_is_priv) {
2310                         /* Special case, linklocal to loop */
2311                         if (dest_is_loop)
2312                                 return (NULL);
2313                 }
2314         }
2315         /*
2316          * Now that we know what is what, implement our table. This could in
2317          * theory be done slicker (it used to be), but this is
2318          * straightforward and easier to validate :-)
2319          */
2320         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2321                 return (NULL);
2322         }
2323         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2324                 return (NULL);
2325         }
2326         /* its an acceptable address */
2327         return (ifa);
2328 }
2329
2330 int
2331 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2332 {
2333         struct sctp_laddr *laddr;
2334
2335         if (stcb == NULL) {
2336                 /* There are no restrictions, no TCB :-) */
2337                 return (0);
2338         }
2339         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2340                 if (laddr->ifa == NULL) {
2341                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2342                             __FUNCTION__);
2343                         continue;
2344                 }
2345                 if (laddr->ifa == ifa) {
2346                         /* Yes it is on the list */
2347                         return (1);
2348                 }
2349         }
2350         return (0);
2351 }
2352
2353
2354 int
2355 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2356 {
2357         struct sctp_laddr *laddr;
2358
2359         if (ifa == NULL)
2360                 return (0);
2361         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2362                 if (laddr->ifa == NULL) {
2363                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2364                             __FUNCTION__);
2365                         continue;
2366                 }
2367                 if ((laddr->ifa == ifa) && laddr->action == 0)
2368                         /* same pointer */
2369                         return (1);
2370         }
2371         return (0);
2372 }
2373
2374
2375
2376 static struct sctp_ifa *
2377 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2378     sctp_route_t * ro,
2379     uint32_t vrf_id,
2380     int non_asoc_addr_ok,
2381     uint8_t dest_is_priv,
2382     uint8_t dest_is_loop,
2383     sa_family_t fam)
2384 {
2385         struct sctp_laddr *laddr, *starting_point;
2386         void *ifn;
2387         int resettotop = 0;
2388         struct sctp_ifn *sctp_ifn;
2389         struct sctp_ifa *sctp_ifa, *sifa;
2390         struct sctp_vrf *vrf;
2391         uint32_t ifn_index;
2392
2393         vrf = sctp_find_vrf(vrf_id);
2394         if (vrf == NULL)
2395                 return (NULL);
2396
2397         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2398         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2399         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2400         /*
2401          * first question, is the ifn we will emit on in our list, if so, we
2402          * want such an address. Note that we first looked for a preferred
2403          * address.
2404          */
2405         if (sctp_ifn) {
2406                 /* is a preferred one on the interface we route out? */
2407                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2408                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2409                             (non_asoc_addr_ok == 0))
2410                                 continue;
2411                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2412                             dest_is_loop,
2413                             dest_is_priv, fam);
2414                         if (sifa == NULL)
2415                                 continue;
2416                         if (sctp_is_addr_in_ep(inp, sifa)) {
2417                                 atomic_add_int(&sifa->refcount, 1);
2418                                 return (sifa);
2419                         }
2420                 }
2421         }
2422         /*
2423          * ok, now we now need to find one on the list of the addresses. We
2424          * can't get one on the emitting interface so let's find first a
2425          * preferred one. If not that an acceptable one otherwise... we
2426          * return NULL.
2427          */
2428         starting_point = inp->next_addr_touse;
2429 once_again:
2430         if (inp->next_addr_touse == NULL) {
2431                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2432                 resettotop = 1;
2433         }
2434         for (laddr = inp->next_addr_touse; laddr;
2435             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2436                 if (laddr->ifa == NULL) {
2437                         /* address has been removed */
2438                         continue;
2439                 }
2440                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2441                         /* address is being deleted */
2442                         continue;
2443                 }
2444                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2445                     dest_is_priv, fam);
2446                 if (sifa == NULL)
2447                         continue;
2448                 atomic_add_int(&sifa->refcount, 1);
2449                 return (sifa);
2450         }
2451         if (resettotop == 0) {
2452                 inp->next_addr_touse = NULL;
2453                 goto once_again;
2454         }
2455         inp->next_addr_touse = starting_point;
2456         resettotop = 0;
2457 once_again_too:
2458         if (inp->next_addr_touse == NULL) {
2459                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2460                 resettotop = 1;
2461         }
2462         /* ok, what about an acceptable address in the inp */
2463         for (laddr = inp->next_addr_touse; laddr;
2464             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2465                 if (laddr->ifa == NULL) {
2466                         /* address has been removed */
2467                         continue;
2468                 }
2469                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2470                         /* address is being deleted */
2471                         continue;
2472                 }
2473                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2474                     dest_is_priv, fam);
2475                 if (sifa == NULL)
2476                         continue;
2477                 atomic_add_int(&sifa->refcount, 1);
2478                 return (sifa);
2479         }
2480         if (resettotop == 0) {
2481                 inp->next_addr_touse = NULL;
2482                 goto once_again_too;
2483         }
2484         /*
2485          * no address bound can be a source for the destination we are in
2486          * trouble
2487          */
2488         return (NULL);
2489 }
2490
2491
2492
2493 static struct sctp_ifa *
2494 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2495     struct sctp_tcb *stcb,
2496     struct sctp_nets *net,
2497     sctp_route_t * ro,
2498     uint32_t vrf_id,
2499     uint8_t dest_is_priv,
2500     uint8_t dest_is_loop,
2501     int non_asoc_addr_ok,
2502     sa_family_t fam)
2503 {
2504         struct sctp_laddr *laddr, *starting_point;
2505         void *ifn;
2506         struct sctp_ifn *sctp_ifn;
2507         struct sctp_ifa *sctp_ifa, *sifa;
2508         uint8_t start_at_beginning = 0;
2509         struct sctp_vrf *vrf;
2510         uint32_t ifn_index;
2511
2512         /*
2513          * first question, is the ifn we will emit on in our list, if so, we
2514          * want that one.
2515          */
2516         vrf = sctp_find_vrf(vrf_id);
2517         if (vrf == NULL)
2518                 return (NULL);
2519
2520         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2521         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2522         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2523
2524         /*
2525          * first question, is the ifn we will emit on in our list?  If so,
2526          * we want that one. First we look for a preferred. Second, we go
2527          * for an acceptable.
2528          */
2529         if (sctp_ifn) {
2530                 /* first try for a preferred address on the ep */
2531                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2532                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2533                                 continue;
2534                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2535                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2536                                 if (sifa == NULL)
2537                                         continue;
2538                                 if (((non_asoc_addr_ok == 0) &&
2539                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2540                                     (non_asoc_addr_ok &&
2541                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2542                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2543                                         /* on the no-no list */
2544                                         continue;
2545                                 }
2546                                 atomic_add_int(&sifa->refcount, 1);
2547                                 return (sifa);
2548                         }
2549                 }
2550                 /* next try for an acceptable address on the ep */
2551                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2552                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2553                                 continue;
2554                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2555                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2556                                 if (sifa == NULL)
2557                                         continue;
2558                                 if (((non_asoc_addr_ok == 0) &&
2559                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2560                                     (non_asoc_addr_ok &&
2561                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2562                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2563                                         /* on the no-no list */
2564                                         continue;
2565                                 }
2566                                 atomic_add_int(&sifa->refcount, 1);
2567                                 return (sifa);
2568                         }
2569                 }
2570
2571         }
2572         /*
2573          * if we can't find one like that then we must look at all addresses
2574          * bound to pick one at first preferable then secondly acceptable.
2575          */
2576         starting_point = stcb->asoc.last_used_address;
2577 sctp_from_the_top:
2578         if (stcb->asoc.last_used_address == NULL) {
2579                 start_at_beginning = 1;
2580                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2581         }
2582         /* search beginning with the last used address */
2583         for (laddr = stcb->asoc.last_used_address; laddr;
2584             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2585                 if (laddr->ifa == NULL) {
2586                         /* address has been removed */
2587                         continue;
2588                 }
2589                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2590                         /* address is being deleted */
2591                         continue;
2592                 }
2593                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2594                 if (sifa == NULL)
2595                         continue;
2596                 if (((non_asoc_addr_ok == 0) &&
2597                     (sctp_is_addr_restricted(stcb, sifa))) ||
2598                     (non_asoc_addr_ok &&
2599                     (sctp_is_addr_restricted(stcb, sifa)) &&
2600                     (!sctp_is_addr_pending(stcb, sifa)))) {
2601                         /* on the no-no list */
2602                         continue;
2603                 }
2604                 stcb->asoc.last_used_address = laddr;
2605                 atomic_add_int(&sifa->refcount, 1);
2606                 return (sifa);
2607         }
2608         if (start_at_beginning == 0) {
2609                 stcb->asoc.last_used_address = NULL;
2610                 goto sctp_from_the_top;
2611         }
2612         /* now try for any higher scope than the destination */
2613         stcb->asoc.last_used_address = starting_point;
2614         start_at_beginning = 0;
2615 sctp_from_the_top2:
2616         if (stcb->asoc.last_used_address == NULL) {
2617                 start_at_beginning = 1;
2618                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2619         }
2620         /* search beginning with the last used address */
2621         for (laddr = stcb->asoc.last_used_address; laddr;
2622             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2623                 if (laddr->ifa == NULL) {
2624                         /* address has been removed */
2625                         continue;
2626                 }
2627                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2628                         /* address is being deleted */
2629                         continue;
2630                 }
2631                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2632                     dest_is_priv, fam);
2633                 if (sifa == NULL)
2634                         continue;
2635                 if (((non_asoc_addr_ok == 0) &&
2636                     (sctp_is_addr_restricted(stcb, sifa))) ||
2637                     (non_asoc_addr_ok &&
2638                     (sctp_is_addr_restricted(stcb, sifa)) &&
2639                     (!sctp_is_addr_pending(stcb, sifa)))) {
2640                         /* on the no-no list */
2641                         continue;
2642                 }
2643                 stcb->asoc.last_used_address = laddr;
2644                 atomic_add_int(&sifa->refcount, 1);
2645                 return (sifa);
2646         }
2647         if (start_at_beginning == 0) {
2648                 stcb->asoc.last_used_address = NULL;
2649                 goto sctp_from_the_top2;
2650         }
2651         return (NULL);
2652 }
2653
2654 static struct sctp_ifa *
2655 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2656     struct sctp_tcb *stcb,
2657     int non_asoc_addr_ok,
2658     uint8_t dest_is_loop,
2659     uint8_t dest_is_priv,
2660     int addr_wanted,
2661     sa_family_t fam,
2662     sctp_route_t * ro
2663 )
2664 {
2665         struct sctp_ifa *ifa, *sifa;
2666         int num_eligible_addr = 0;
2667
2668 #ifdef INET6
2669         struct sockaddr_in6 sin6, lsa6;
2670
2671         if (fam == AF_INET6) {
2672                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2673                 (void)sa6_recoverscope(&sin6);
2674         }
2675 #endif                          /* INET6 */
2676         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2677                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2678                     (non_asoc_addr_ok == 0))
2679                         continue;
2680                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2681                     dest_is_priv, fam);
2682                 if (sifa == NULL)
2683                         continue;
2684 #ifdef INET6
2685                 if (fam == AF_INET6 &&
2686                     dest_is_loop &&
2687                     sifa->src_is_loop && sifa->src_is_priv) {
2688                         /*
2689                          * don't allow fe80::1 to be a src on loop ::1, we
2690                          * don't list it to the peer so we will get an
2691                          * abort.
2692                          */
2693                         continue;
2694                 }
2695                 if (fam == AF_INET6 &&
2696                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2697                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2698                         /*
2699                          * link-local <-> link-local must belong to the same
2700                          * scope.
2701                          */
2702                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2703                         (void)sa6_recoverscope(&lsa6);
2704                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2705                                 continue;
2706                         }
2707                 }
2708 #endif                          /* INET6 */
2709
2710                 /*
2711                  * Check if the IPv6 address matches to next-hop. In the
2712                  * mobile case, old IPv6 address may be not deleted from the
2713                  * interface. Then, the interface has previous and new
2714                  * addresses.  We should use one corresponding to the
2715                  * next-hop.  (by micchie)
2716                  */
2717 #ifdef INET6
2718                 if (stcb && fam == AF_INET6 &&
2719                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2720                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2721                             == 0) {
2722                                 continue;
2723                         }
2724                 }
2725 #endif
2726                 /* Avoid topologically incorrect IPv4 address */
2727                 if (stcb && fam == AF_INET &&
2728                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2729                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2730                                 continue;
2731                         }
2732                 }
2733                 if (stcb) {
2734                         if (((non_asoc_addr_ok == 0) &&
2735                             (sctp_is_addr_restricted(stcb, sifa))) ||
2736                             (non_asoc_addr_ok &&
2737                             (sctp_is_addr_restricted(stcb, sifa)) &&
2738                             (!sctp_is_addr_pending(stcb, sifa)))) {
2739                                 /*
2740                                  * It is restricted for some reason..
2741                                  * probably not yet added.
2742                                  */
2743                                 continue;
2744                         }
2745                 }
2746                 if (num_eligible_addr >= addr_wanted) {
2747                         return (sifa);
2748                 }
2749                 num_eligible_addr++;
2750         }
2751         return (NULL);
2752 }
2753
2754
2755 static int
2756 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2757     struct sctp_tcb *stcb,
2758     int non_asoc_addr_ok,
2759     uint8_t dest_is_loop,
2760     uint8_t dest_is_priv,
2761     sa_family_t fam)
2762 {
2763         struct sctp_ifa *ifa, *sifa;
2764         int num_eligible_addr = 0;
2765
2766         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2767                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2768                     (non_asoc_addr_ok == 0)) {
2769                         continue;
2770                 }
2771                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2772                     dest_is_priv, fam);
2773                 if (sifa == NULL) {
2774                         continue;
2775                 }
2776                 if (stcb) {
2777                         if (((non_asoc_addr_ok == 0) &&
2778                             (sctp_is_addr_restricted(stcb, sifa))) ||
2779                             (non_asoc_addr_ok &&
2780                             (sctp_is_addr_restricted(stcb, sifa)) &&
2781                             (!sctp_is_addr_pending(stcb, sifa)))) {
2782                                 /*
2783                                  * It is restricted for some reason..
2784                                  * probably not yet added.
2785                                  */
2786                                 continue;
2787                         }
2788                 }
2789                 num_eligible_addr++;
2790         }
2791         return (num_eligible_addr);
2792 }
2793
2794 static struct sctp_ifa *
2795 sctp_choose_boundall(struct sctp_inpcb *inp,
2796     struct sctp_tcb *stcb,
2797     struct sctp_nets *net,
2798     sctp_route_t * ro,
2799     uint32_t vrf_id,
2800     uint8_t dest_is_priv,
2801     uint8_t dest_is_loop,
2802     int non_asoc_addr_ok,
2803     sa_family_t fam)
2804 {
2805         int cur_addr_num = 0, num_preferred = 0;
2806         void *ifn;
2807         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2808         struct sctp_ifa *sctp_ifa, *sifa;
2809         uint32_t ifn_index;
2810         struct sctp_vrf *vrf;
2811
2812         /*-
2813          * For boundall we can use any address in the association.
2814          * If non_asoc_addr_ok is set we can use any address (at least in
2815          * theory). So we look for preferred addresses first. If we find one,
2816          * we use it. Otherwise we next try to get an address on the
2817          * interface, which we should be able to do (unless non_asoc_addr_ok
2818          * is false and we are routed out that way). In these cases where we
2819          * can't use the address of the interface we go through all the
2820          * ifn's looking for an address we can use and fill that in. Punting
2821          * means we send back address 0, which will probably cause problems
2822          * actually since then IP will fill in the address of the route ifn,
2823          * which means we probably already rejected it.. i.e. here comes an
2824          * abort :-<.
2825          */
2826         vrf = sctp_find_vrf(vrf_id);
2827         if (vrf == NULL)
2828                 return (NULL);
2829
2830         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2831         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2832         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2833         if (sctp_ifn == NULL) {
2834                 /* ?? We don't have this guy ?? */
2835                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2836                 goto bound_all_plan_b;
2837         }
2838         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2839             ifn_index, sctp_ifn->ifn_name);
2840
2841         if (net) {
2842                 cur_addr_num = net->indx_of_eligible_next_to_use;
2843         }
2844         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2845             stcb,
2846             non_asoc_addr_ok,
2847             dest_is_loop,
2848             dest_is_priv, fam);
2849         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2850             num_preferred, sctp_ifn->ifn_name);
2851         if (num_preferred == 0) {
2852                 /*
2853                  * no eligible addresses, we must use some other interface
2854                  * address if we can find one.
2855                  */
2856                 goto bound_all_plan_b;
2857         }
2858         /*
2859          * Ok we have num_eligible_addr set with how many we can use, this
2860          * may vary from call to call due to addresses being deprecated
2861          * etc..
2862          */
2863         if (cur_addr_num >= num_preferred) {
2864                 cur_addr_num = 0;
2865         }
2866         /*
2867          * select the nth address from the list (where cur_addr_num is the
2868          * nth) and 0 is the first one, 1 is the second one etc...
2869          */
2870         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2871
2872         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2873             dest_is_priv, cur_addr_num, fam, ro);
2874
2875         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2876         if (sctp_ifa) {
2877                 atomic_add_int(&sctp_ifa->refcount, 1);
2878                 if (net) {
2879                         /* save off where the next one we will want */
2880                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2881                 }
2882                 return (sctp_ifa);
2883         }
2884         /*
2885          * plan_b: Look at all interfaces and find a preferred address. If
2886          * no preferred fall through to plan_c.
2887          */
2888 bound_all_plan_b:
2889         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2890         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2891                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2892                     sctp_ifn->ifn_name);
2893                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2894                         /* wrong base scope */
2895                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2896                         continue;
2897                 }
2898                 if ((sctp_ifn == looked_at) && looked_at) {
2899                         /* already looked at this guy */
2900                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2901                         continue;
2902                 }
2903                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2904                     dest_is_loop, dest_is_priv, fam);
2905                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2906                     "Found ifn:%p %d preferred source addresses\n",
2907                     ifn, num_preferred);
2908                 if (num_preferred == 0) {
2909                         /* None on this interface. */
2910                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2911                         continue;
2912                 }
2913                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2914                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2915                     num_preferred, sctp_ifn, cur_addr_num);
2916
2917                 /*
2918                  * Ok we have num_eligible_addr set with how many we can
2919                  * use, this may vary from call to call due to addresses
2920                  * being deprecated etc..
2921                  */
2922                 if (cur_addr_num >= num_preferred) {
2923                         cur_addr_num = 0;
2924                 }
2925                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2926                     dest_is_priv, cur_addr_num, fam, ro);
2927                 if (sifa == NULL)
2928                         continue;
2929                 if (net) {
2930                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2931                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2932                             cur_addr_num);
2933                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2934                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2935                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2936                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2937                 }
2938                 atomic_add_int(&sifa->refcount, 1);
2939                 return (sifa);
2940
2941         }
2942
2943         /* plan_c: do we have an acceptable address on the emit interface */
2944         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2945         if (emit_ifn == NULL) {
2946                 goto plan_d;
2947         }
2948         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2949                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2950                     (non_asoc_addr_ok == 0))
2951                         continue;
2952                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2953                     dest_is_priv, fam);
2954                 if (sifa == NULL)
2955                         continue;
2956                 if (stcb) {
2957                         if (((non_asoc_addr_ok == 0) &&
2958                             (sctp_is_addr_restricted(stcb, sifa))) ||
2959                             (non_asoc_addr_ok &&
2960                             (sctp_is_addr_restricted(stcb, sifa)) &&
2961                             (!sctp_is_addr_pending(stcb, sifa)))) {
2962                                 /*
2963                                  * It is restricted for some reason..
2964                                  * probably not yet added.
2965                                  */
2966                                 continue;
2967                         }
2968                 }
2969                 atomic_add_int(&sifa->refcount, 1);
2970                 return (sifa);
2971         }
2972 plan_d:
2973         /*
2974          * plan_d: We are in trouble. No preferred address on the emit
2975          * interface. And not even a preferred address on all interfaces. Go
2976          * out and see if we can find an acceptable address somewhere
2977          * amongst all interfaces.
2978          */
2979         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
2980         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2981                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2982                         /* wrong base scope */
2983                         continue;
2984                 }
2985                 if ((sctp_ifn == looked_at) && looked_at)
2986                         /* already looked at this guy */
2987                         continue;
2988
2989                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2990                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2991                             (non_asoc_addr_ok == 0))
2992                                 continue;
2993                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
2994                             dest_is_loop,
2995                             dest_is_priv, fam);
2996                         if (sifa == NULL)
2997                                 continue;
2998                         if (stcb) {
2999                                 if (((non_asoc_addr_ok == 0) &&
3000                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3001                                     (non_asoc_addr_ok &&
3002                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3003                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3004                                         /*
3005                                          * It is restricted for some
3006                                          * reason.. probably not yet added.
3007                                          */
3008                                         continue;
3009                                 }
3010                         }
3011                         atomic_add_int(&sifa->refcount, 1);
3012                         return (sifa);
3013                 }
3014         }
3015         /*
3016          * Ok we can find NO address to source from that is not on our
3017          * restricted list and non_asoc_address is NOT ok, or it is on our
3018          * restricted list. We can't source to it :-(
3019          */
3020         return (NULL);
3021 }
3022
3023
3024
3025 /* tcb may be NULL */
3026 struct sctp_ifa *
3027 sctp_source_address_selection(struct sctp_inpcb *inp,
3028     struct sctp_tcb *stcb,
3029     sctp_route_t * ro,
3030     struct sctp_nets *net,
3031     int non_asoc_addr_ok, uint32_t vrf_id)
3032 {
3033         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3034
3035 #ifdef INET6
3036         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3037
3038 #endif
3039         struct sctp_ifa *answer;
3040         uint8_t dest_is_priv, dest_is_loop;
3041         sa_family_t fam;
3042
3043         /*-
3044          * Rules: - Find the route if needed, cache if I can. - Look at
3045          * interface address in route, Is it in the bound list. If so we
3046          * have the best source. - If not we must rotate amongst the
3047          * addresses.
3048          *
3049          * Cavets and issues
3050          *
3051          * Do we need to pay attention to scope. We can have a private address
3052          * or a global address we are sourcing or sending to. So if we draw
3053          * it out
3054          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3055          * For V4
3056          * ------------------------------------------
3057          *      source     *      dest  *  result
3058          * -----------------------------------------
3059          * <a>  Private    *    Global  *  NAT
3060          * -----------------------------------------
3061          * <b>  Private    *    Private *  No problem
3062          * -----------------------------------------
3063          * <c>  Global     *    Private *  Huh, How will this work?
3064          * -----------------------------------------
3065          * <d>  Global     *    Global  *  No Problem
3066          *------------------------------------------
3067          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3068          * For V6
3069          *------------------------------------------
3070          *      source     *      dest  *  result
3071          * -----------------------------------------
3072          * <a>  Linklocal  *    Global  *
3073          * -----------------------------------------
3074          * <b>  Linklocal  * Linklocal  *  No problem
3075          * -----------------------------------------
3076          * <c>  Global     * Linklocal  *  Huh, How will this work?
3077          * -----------------------------------------
3078          * <d>  Global     *    Global  *  No Problem
3079          *------------------------------------------
3080          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3081          *
3082          * And then we add to that what happens if there are multiple addresses
3083          * assigned to an interface. Remember the ifa on a ifn is a linked
3084          * list of addresses. So one interface can have more than one IP
3085          * address. What happens if we have both a private and a global
3086          * address? Do we then use context of destination to sort out which
3087          * one is best? And what about NAT's sending P->G may get you a NAT
3088          * translation, or should you select the G thats on the interface in
3089          * preference.
3090          *
3091          * Decisions:
3092          *
3093          * - count the number of addresses on the interface.
3094          * - if it is one, no problem except case <c>.
3095          *   For <a> we will assume a NAT out there.
3096          * - if there are more than one, then we need to worry about scope P
3097          *   or G. We should prefer G -> G and P -> P if possible.
3098          *   Then as a secondary fall back to mixed types G->P being a last
3099          *   ditch one.
3100          * - The above all works for bound all, but bound specific we need to
3101          *   use the same concept but instead only consider the bound
3102          *   addresses. If the bound set is NOT assigned to the interface then
3103          *   we must use rotation amongst the bound addresses..
3104          */
3105         if (ro->ro_rt == NULL) {
3106                 /*
3107                  * Need a route to cache.
3108                  */
3109                 SCTP_RTALLOC(ro, vrf_id);
3110         }
3111         if (ro->ro_rt == NULL) {
3112                 return (NULL);
3113         }
3114         fam = to->sin_family;
3115         dest_is_priv = dest_is_loop = 0;
3116         /* Setup our scopes for the destination */
3117         switch (fam) {
3118         case AF_INET:
3119                 /* Scope based on outbound address */
3120                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3121                         dest_is_loop = 1;
3122                         if (net != NULL) {
3123                                 /* mark it as local */
3124                                 net->addr_is_local = 1;
3125                         }
3126                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3127                         dest_is_priv = 1;
3128                 }
3129                 break;
3130 #ifdef INET6
3131         case AF_INET6:
3132                 /* Scope based on outbound address */
3133                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3134                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3135                         /*
3136                          * If the address is a loopback address, which
3137                          * consists of "::1" OR "fe80::1%lo0", we are
3138                          * loopback scope. But we don't use dest_is_priv
3139                          * (link local addresses).
3140                          */
3141                         dest_is_loop = 1;
3142                         if (net != NULL) {
3143                                 /* mark it as local */
3144                                 net->addr_is_local = 1;
3145                         }
3146                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3147                         dest_is_priv = 1;
3148                 }
3149                 break;
3150 #endif
3151         }
3152         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3153         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3154         SCTP_IPI_ADDR_RLOCK();
3155         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3156                 /*
3157                  * Bound all case
3158                  */
3159                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3160                     dest_is_priv, dest_is_loop,
3161                     non_asoc_addr_ok, fam);
3162                 SCTP_IPI_ADDR_RUNLOCK();
3163                 return (answer);
3164         }
3165         /*
3166          * Subset bound case
3167          */
3168         if (stcb) {
3169                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3170                     vrf_id, dest_is_priv,
3171                     dest_is_loop,
3172                     non_asoc_addr_ok, fam);
3173         } else {
3174                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3175                     non_asoc_addr_ok,
3176                     dest_is_priv,
3177                     dest_is_loop, fam);
3178         }
3179         SCTP_IPI_ADDR_RUNLOCK();
3180         return (answer);
3181 }
3182
3183 static int
3184 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3185 {
3186         struct cmsghdr cmh;
3187         int tlen, at;
3188
3189         tlen = SCTP_BUF_LEN(control);
3190         at = 0;
3191         /*
3192          * Independent of how many mbufs, find the c_type inside the control
3193          * structure and copy out the data.
3194          */
3195         while (at < tlen) {
3196                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3197                         /* not enough room for one more we are done. */
3198                         return (0);
3199                 }
3200                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3201                 if (((int)cmh.cmsg_len + at) > tlen) {
3202                         /*
3203                          * this is real messed up since there is not enough
3204                          * data here to cover the cmsg header. We are done.
3205                          */
3206                         return (0);
3207                 }
3208                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3209                     (c_type == cmh.cmsg_type)) {
3210                         /* found the one we want, copy it out */
3211                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3212                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3213                                 /*
3214                                  * space of cmsg_len after header not big
3215                                  * enough
3216                                  */
3217                                 return (0);
3218                         }
3219                         m_copydata(control, at, cpsize, data);
3220                         return (1);
3221                 } else {
3222                         at += CMSG_ALIGN(cmh.cmsg_len);
3223                         if (cmh.cmsg_len == 0) {
3224                                 break;
3225                         }
3226                 }
3227         }
3228         /* not found */
3229         return (0);
3230 }
3231
3232 static struct mbuf *
3233 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3234     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3235 {
3236         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3237         struct sctp_state_cookie *stc;
3238         struct sctp_paramhdr *ph;
3239         uint8_t *foo;
3240         int sig_offset;
3241         uint16_t cookie_sz;
3242
3243         mret = NULL;
3244         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3245             sizeof(struct sctp_paramhdr)), 0,
3246             M_DONTWAIT, 1, MT_DATA);
3247         if (mret == NULL) {
3248                 return (NULL);
3249         }
3250         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3251         if (copy_init == NULL) {
3252                 sctp_m_freem(mret);
3253                 return (NULL);
3254         }
3255 #ifdef SCTP_MBUF_LOGGING
3256         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3257                 struct mbuf *mat;
3258
3259                 mat = copy_init;
3260                 while (mat) {
3261                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3262                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3263                         }
3264                         mat = SCTP_BUF_NEXT(mat);
3265                 }
3266         }
3267 #endif
3268         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3269             M_DONTWAIT);
3270         if (copy_initack == NULL) {
3271                 sctp_m_freem(mret);
3272                 sctp_m_freem(copy_init);
3273                 return (NULL);
3274         }
3275 #ifdef SCTP_MBUF_LOGGING
3276         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3277                 struct mbuf *mat;
3278
3279                 mat = copy_initack;
3280                 while (mat) {
3281                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3282                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3283                         }
3284                         mat = SCTP_BUF_NEXT(mat);
3285                 }
3286         }
3287 #endif
3288         /* easy side we just drop it on the end */
3289         ph = mtod(mret, struct sctp_paramhdr *);
3290         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3291             sizeof(struct sctp_paramhdr);
3292         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3293             sizeof(struct sctp_paramhdr));
3294         ph->param_type = htons(SCTP_STATE_COOKIE);
3295         ph->param_length = 0;   /* fill in at the end */
3296         /* Fill in the stc cookie data */
3297         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3298
3299         /* tack the INIT and then the INIT-ACK onto the chain */
3300         cookie_sz = 0;
3301         m_at = mret;
3302         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3303                 cookie_sz += SCTP_BUF_LEN(m_at);
3304                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3305                         SCTP_BUF_NEXT(m_at) = copy_init;
3306                         break;
3307                 }
3308         }
3309
3310         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3311                 cookie_sz += SCTP_BUF_LEN(m_at);
3312                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3313                         SCTP_BUF_NEXT(m_at) = copy_initack;
3314                         break;
3315                 }
3316         }
3317
3318         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3319                 cookie_sz += SCTP_BUF_LEN(m_at);
3320                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3321                         break;
3322                 }
3323         }
3324         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3325         if (sig == NULL) {
3326                 /* no space, so free the entire chain */
3327                 sctp_m_freem(mret);
3328                 return (NULL);
3329         }
3330         SCTP_BUF_LEN(sig) = 0;
3331         SCTP_BUF_NEXT(m_at) = sig;
3332         sig_offset = 0;
3333         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3334         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3335         *signature = foo;
3336         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3337         cookie_sz += SCTP_SIGNATURE_SIZE;
3338         ph->param_length = htons(cookie_sz);
3339         return (mret);
3340 }
3341
3342
3343 static uint8_t
3344 sctp_get_ect(struct sctp_tcb *stcb,
3345     struct sctp_tmit_chunk *chk)
3346 {
3347         uint8_t this_random;
3348
3349         /* Huh? */
3350         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3351                 return (0);
3352
3353         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
3354                 /* no nonce, always return ECT0 */
3355                 return (SCTP_ECT0_BIT);
3356
3357         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3358                 /* Peer does NOT support it, so we send a ECT0 only */
3359                 return (SCTP_ECT0_BIT);
3360         }
3361         if (chk == NULL)
3362                 return (SCTP_ECT0_BIT);
3363
3364         if ((stcb->asoc.hb_random_idx > 3) ||
3365             ((stcb->asoc.hb_random_idx == 3) &&
3366             (stcb->asoc.hb_ect_randombit > 7))) {
3367                 uint32_t rndval;
3368
3369 warp_drive_sa:
3370                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3371                 memcpy(stcb->asoc.hb_random_values, &rndval,
3372                     sizeof(stcb->asoc.hb_random_values));
3373                 this_random = stcb->asoc.hb_random_values[0];
3374                 stcb->asoc.hb_random_idx = 0;
3375                 stcb->asoc.hb_ect_randombit = 0;
3376         } else {
3377                 if (stcb->asoc.hb_ect_randombit > 7) {
3378                         stcb->asoc.hb_ect_randombit = 0;
3379                         stcb->asoc.hb_random_idx++;
3380                         if (stcb->asoc.hb_random_idx > 3) {
3381                                 goto warp_drive_sa;
3382                         }
3383                 }
3384                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3385         }
3386         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3387                 if (chk != NULL)
3388                         /* ECN Nonce stuff */
3389                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3390                 stcb->asoc.hb_ect_randombit++;
3391                 return (SCTP_ECT1_BIT);
3392         } else {
3393                 stcb->asoc.hb_ect_randombit++;
3394                 return (SCTP_ECT0_BIT);
3395         }
3396 }
3397
3398 static int
3399 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3400     struct sctp_tcb *stcb,      /* may be NULL */
3401     struct sctp_nets *net,
3402     struct sockaddr *to,
3403     struct mbuf *m,
3404     uint32_t auth_offset,
3405     struct sctp_auth_chunk *auth,
3406     uint16_t auth_keyid,
3407     int nofragment_flag,
3408     int ecn_ok,
3409     struct sctp_tmit_chunk *chk,
3410     int out_of_asoc_ok,
3411     uint16_t src_port,
3412     uint16_t dest_port,
3413     uint32_t v_tag,
3414     uint16_t port,
3415     int so_locked,
3416 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3417     SCTP_UNUSED
3418 #endif
3419     union sctp_sockstore *over_addr
3420 )
3421 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3422 {
3423         /*
3424          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3425          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3426          * structure: - fill in the HMAC digest of any AUTH chunk in the
3427          * packet. - calculate and fill in the SCTP checksum. - prepend an
3428          * IP address header. - if boundall use INADDR_ANY. - if
3429          * boundspecific do source address selection. - set fragmentation
3430          * option for ipV4. - On return from IP output, check/adjust mtu
3431          * size of output interface and smallest_mtu size as well.
3432          */
3433         /* Will need ifdefs around this */
3434         struct mbuf *o_pak;
3435         struct mbuf *newm;
3436         struct sctphdr *sctphdr;
3437         int packet_length;
3438         int ret;
3439         uint32_t vrf_id;
3440         sctp_route_t *ro = NULL;
3441         struct udphdr *udp = NULL;
3442
3443 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3444         struct socket *so = NULL;
3445
3446 #endif
3447
3448         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3449                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3450                 sctp_m_freem(m);
3451                 return (EFAULT);
3452         }
3453         if (stcb) {
3454                 vrf_id = stcb->asoc.vrf_id;
3455         } else {
3456                 vrf_id = inp->def_vrf_id;
3457         }
3458
3459         /* fill in the HMAC digest for any AUTH chunk in the packet */
3460         if ((auth != NULL) && (stcb != NULL)) {
3461                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3462         }
3463         if (to->sa_family == AF_INET) {
3464                 struct ip *ip = NULL;
3465                 sctp_route_t iproute;
3466                 uint8_t tos_value;
3467                 int len;
3468
3469                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3470                 if (port) {
3471                         len += sizeof(struct udphdr);
3472                 }
3473                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3474                 if (newm == NULL) {
3475                         sctp_m_freem(m);
3476                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3477                         return (ENOMEM);
3478                 }
3479                 SCTP_ALIGN_TO_END(newm, len);
3480                 SCTP_BUF_LEN(newm) = len;
3481                 SCTP_BUF_NEXT(newm) = m;
3482                 m = newm;
3483                 packet_length = sctp_calculate_len(m);
3484                 ip = mtod(m, struct ip *);
3485                 ip->ip_v = IPVERSION;
3486                 ip->ip_hl = (sizeof(struct ip) >> 2);
3487                 if (net) {
3488                         tos_value = net->tos_flowlabel & 0x000000ff;
3489                 } else {
3490                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3491                 }
3492                 if ((nofragment_flag) && (port == 0)) {
3493                         ip->ip_off = IP_DF;
3494                 } else
3495                         ip->ip_off = 0;
3496
3497                 /* FreeBSD has a function for ip_id's */
3498                 ip->ip_id = ip_newid();
3499
3500                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3501                 ip->ip_len = packet_length;
3502                 if (stcb) {
3503                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3504                                 /* Enable ECN */
3505                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3506                         } else {
3507                                 /* No ECN */
3508                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3509                         }
3510                 } else {
3511                         /* no association at all */
3512                         ip->ip_tos = (tos_value & 0xfc);
3513                 }
3514                 if (port) {
3515                         ip->ip_p = IPPROTO_UDP;
3516                 } else {
3517                         ip->ip_p = IPPROTO_SCTP;
3518                 }
3519                 ip->ip_sum = 0;
3520                 if (net == NULL) {
3521                         ro = &iproute;
3522                         memset(&iproute, 0, sizeof(iproute));
3523                         memcpy(&ro->ro_dst, to, to->sa_len);
3524                 } else {
3525                         ro = (sctp_route_t *) & net->ro;
3526                 }
3527                 /* Now the address selection part */
3528                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3529
3530                 /* call the routine to select the src address */
3531                 if (net && out_of_asoc_ok == 0) {
3532                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3533                                 sctp_free_ifa(net->ro._s_addr);
3534                                 net->ro._s_addr = NULL;
3535                                 net->src_addr_selected = 0;
3536                                 if (ro->ro_rt) {
3537                                         RTFREE(ro->ro_rt);
3538                                         ro->ro_rt = NULL;
3539                                 }
3540                         }
3541                         if (net->src_addr_selected == 0) {
3542                                 /* Cache the source address */
3543                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3544                                     ro, net, 0,
3545                                     vrf_id);
3546                                 net->src_addr_selected = 1;
3547                         }
3548                         if (net->ro._s_addr == NULL) {
3549                                 /* No route to host */
3550                                 net->src_addr_selected = 0;
3551                                 goto no_route;
3552                         }
3553                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3554                 } else {
3555                         if (over_addr == NULL) {
3556                                 struct sctp_ifa *_lsrc;
3557
3558                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3559                                     net,
3560                                     out_of_asoc_ok,
3561                                     vrf_id);
3562                                 if (_lsrc == NULL) {
3563                                         goto no_route;
3564                                 }
3565                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3566                                 sctp_free_ifa(_lsrc);
3567                         } else {
3568                                 ip->ip_src = over_addr->sin.sin_addr;
3569                                 SCTP_RTALLOC(ro, vrf_id);
3570                         }
3571                 }
3572                 if (port) {
3573                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3574                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3575                         udp->uh_dport = port;
3576                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3577                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3578                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3579                 } else {
3580                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3581                 }
3582
3583                 sctphdr->src_port = src_port;
3584                 sctphdr->dest_port = dest_port;
3585                 sctphdr->v_tag = v_tag;
3586                 sctphdr->checksum = 0;
3587
3588                 /*
3589                  * If source address selection fails and we find no route
3590                  * then the ip_output should fail as well with a
3591                  * NO_ROUTE_TO_HOST type error. We probably should catch
3592                  * that somewhere and abort the association right away
3593                  * (assuming this is an INIT being sent).
3594                  */
3595                 if ((ro->ro_rt == NULL)) {
3596                         /*
3597                          * src addr selection failed to find a route (or
3598                          * valid source addr), so we can't get there from
3599                          * here (yet)!
3600                          */
3601         no_route:
3602                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3603                             "%s: dropped packet - no valid source addr\n",
3604                             __FUNCTION__);
3605                         if (net) {
3606                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3607                                     "Destination was ");
3608                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3609                                     &net->ro._l_addr.sa);
3610                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3611                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3612                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3613                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3614                                                     stcb,
3615                                                     SCTP_FAILED_THRESHOLD,
3616                                                     (void *)net,
3617                                                     so_locked);
3618                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3619                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3620                                                 /*
3621                                                  * JRS 5/14/07 - If a
3622                                                  * destination is
3623                                                  * unreachable, the PF bit
3624                                                  * is turned off.  This
3625                                                  * allows an unambiguous use
3626                                                  * of the PF bit for
3627                                                  * destinations that are
3628                                                  * reachable but potentially
3629                                                  * failed. If the
3630                                                  * destination is set to the
3631                                                  * unreachable state, also
3632                                                  * set the destination to
3633                                                  * the PF state.
3634                                                  */
3635                                                 /*
3636                                                  * Add debug message here if
3637                                                  * destination is not in PF
3638                                                  * state.
3639                                                  */
3640                                                 /*
3641                                                  * Stop any running T3
3642                                                  * timers here?
3643                                                  */
3644                                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
3645                                                         net->dest_state &= ~SCTP_ADDR_PF;
3646                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3647                                                             net);
3648                                                 }
3649                                         }
3650                                 }
3651                                 if (stcb) {
3652                                         if (net == stcb->asoc.primary_destination) {
3653                                                 /* need a new primary */
3654                                                 struct sctp_nets *alt;
3655
3656                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3657                                                 if (alt != net) {
3658                                                         if (sctp_set_primary_addr(stcb,
3659                                                             (struct sockaddr *)NULL,
3660                                                             alt) == 0) {
3661                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3662                                                                 if (net->ro._s_addr) {
3663                                                                         sctp_free_ifa(net->ro._s_addr);
3664                                                                         net->ro._s_addr = NULL;
3665                                                                 }
3666                                                                 net->src_addr_selected = 0;
3667                                                         }
3668                                                 }
3669                                         }
3670                                 }
3671                         }
3672                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3673                         sctp_m_freem(m);
3674                         return (EHOSTUNREACH);
3675                 }
3676                 if (ro != &iproute) {
3677                         memcpy(&iproute, ro, sizeof(*ro));
3678                 }
3679                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3680                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3681                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3682                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3683                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3684                     ro->ro_rt);
3685
3686                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3687                         /* failed to prepend data, give up */
3688                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3689                         sctp_m_freem(m);
3690                         return (ENOMEM);
3691                 }
3692 #ifdef  SCTP_PACKET_LOGGING
3693                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3694                         sctp_packet_log(m, packet_length);
3695 #endif
3696                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3697                 if (port) {
3698                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3699                             (stcb) &&
3700                             (stcb->asoc.loopback_scope))) {
3701                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3702                                 SCTP_STAT_INCR(sctps_sendswcrc);
3703                         } else {
3704                                 SCTP_STAT_INCR(sctps_sendnocrc);
3705                         }
3706                         SCTP_ENABLE_UDP_CSUM(o_pak);
3707                 } else {
3708                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3709                             (stcb) &&
3710                             (stcb->asoc.loopback_scope))) {
3711                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
3712                                 m->m_pkthdr.csum_data = 0;
3713                                 SCTP_STAT_INCR(sctps_sendhwcrc);
3714                         } else {
3715                                 SCTP_STAT_INCR(sctps_sendnocrc);
3716                         }
3717                 }
3718                 /* send it out.  table id is taken from stcb */
3719 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3720                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3721                         so = SCTP_INP_SO(inp);
3722                         SCTP_SOCKET_UNLOCK(so, 0);
3723                 }
3724 #endif
3725                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3726 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3727                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3728                         atomic_add_int(&stcb->asoc.refcnt, 1);
3729                         SCTP_TCB_UNLOCK(stcb);
3730                         SCTP_SOCKET_LOCK(so, 0);
3731                         SCTP_TCB_LOCK(stcb);
3732                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3733                 }
3734 #endif
3735                 SCTP_STAT_INCR(sctps_sendpackets);
3736                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3737                 if (ret)
3738                         SCTP_STAT_INCR(sctps_senderrors);
3739
3740                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3741                 if (net == NULL) {
3742                         /* free tempy routes */
3743                         if (ro->ro_rt) {
3744                                 RTFREE(ro->ro_rt);
3745                                 ro->ro_rt = NULL;
3746                         }
3747                 } else {
3748                         /* PMTU check versus smallest asoc MTU goes here */
3749                         if ((ro->ro_rt != NULL) &&
3750                             (net->ro._s_addr)) {
3751                                 uint32_t mtu;
3752
3753                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3754                                 if (net->port) {
3755                                         mtu -= sizeof(struct udphdr);
3756                                 }
3757                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3758 #ifdef SCTP_PRINT_FOR_B_AND_M
3759                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n", mtu);
3760 #endif
3761                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3762                                         net->mtu = mtu;
3763                                 }
3764                         } else if (ro->ro_rt == NULL) {
3765                                 /* route was freed */
3766                                 if (net->ro._s_addr &&
3767                                     net->src_addr_selected) {
3768                                         sctp_free_ifa(net->ro._s_addr);
3769                                         net->ro._s_addr = NULL;
3770                                 }
3771                                 net->src_addr_selected = 0;
3772                         }
3773                 }
3774                 return (ret);
3775         }
3776 #ifdef INET6
3777         else if (to->sa_family == AF_INET6) {
3778                 uint32_t flowlabel;
3779                 struct ip6_hdr *ip6h;
3780                 struct route_in6 ip6route;
3781                 struct ifnet *ifp;
3782                 u_char flowTop;
3783                 uint16_t flowBottom;
3784                 u_char tosBottom, tosTop;
3785                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3786                 int prev_scope = 0;
3787                 struct sockaddr_in6 lsa6_storage;
3788                 int error;
3789                 u_short prev_port = 0;
3790                 int len;
3791
3792                 if (net != NULL) {
3793                         flowlabel = net->tos_flowlabel;
3794                 } else {
3795                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3796                 }
3797
3798                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3799                 if (port) {
3800                         len += sizeof(struct udphdr);
3801                 }
3802                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3803                 if (newm == NULL) {
3804                         sctp_m_freem(m);
3805                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3806                         return (ENOMEM);
3807                 }
3808                 SCTP_ALIGN_TO_END(newm, len);
3809                 SCTP_BUF_LEN(newm) = len;
3810                 SCTP_BUF_NEXT(newm) = m;
3811                 m = newm;
3812                 packet_length = sctp_calculate_len(m);
3813
3814                 ip6h = mtod(m, struct ip6_hdr *);
3815                 /*
3816                  * We assume here that inp_flow is in host byte order within
3817                  * the TCB!
3818                  */
3819                 flowBottom = flowlabel & 0x0000ffff;
3820                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3821                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3822                 /* protect *sin6 from overwrite */
3823                 sin6 = (struct sockaddr_in6 *)to;
3824                 tmp = *sin6;
3825                 sin6 = &tmp;
3826
3827                 /* KAME hack: embed scopeid */
3828                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3829                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3830                         return (EINVAL);
3831                 }
3832                 if (net == NULL) {
3833                         memset(&ip6route, 0, sizeof(ip6route));
3834                         ro = (sctp_route_t *) & ip6route;
3835                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3836                 } else {
3837                         ro = (sctp_route_t *) & net->ro;
3838                 }
3839                 if (stcb != NULL) {
3840                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3841                                 /* Enable ECN */
3842                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3843                         } else {
3844                                 /* No ECN */
3845                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3846                         }
3847                 } else {
3848                         /* we could get no asoc if it is a O-O-T-B packet */
3849                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3850                 }
3851                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3852                 if (port) {
3853                         ip6h->ip6_nxt = IPPROTO_UDP;
3854                 } else {
3855                         ip6h->ip6_nxt = IPPROTO_SCTP;
3856                 }
3857                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3858                 ip6h->ip6_dst = sin6->sin6_addr;
3859
3860                 /*
3861                  * Add SRC address selection here: we can only reuse to a
3862                  * limited degree the kame src-addr-sel, since we can try
3863                  * their selection but it may not be bound.
3864                  */
3865                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3866                 lsa6_tmp.sin6_family = AF_INET6;
3867                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3868                 lsa6 = &lsa6_tmp;
3869                 if (net && out_of_asoc_ok == 0) {
3870                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3871                                 sctp_free_ifa(net->ro._s_addr);
3872                                 net->ro._s_addr = NULL;
3873                                 net->src_addr_selected = 0;
3874                                 if (ro->ro_rt) {
3875                                         RTFREE(ro->ro_rt);
3876                                         ro->ro_rt = NULL;
3877                                 }
3878                         }
3879                         if (net->src_addr_selected == 0) {
3880                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3881                                 /* KAME hack: embed scopeid */
3882                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3883                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3884                                         return (EINVAL);
3885                                 }
3886                                 /* Cache the source address */
3887                                 net->ro._s_addr = sctp_source_address_selection(inp,
3888                                     stcb,
3889                                     ro,
3890                                     net,
3891                                     0,
3892                                     vrf_id);
3893                                 (void)sa6_recoverscope(sin6);
3894                                 net->src_addr_selected = 1;
3895                         }
3896                         if (net->ro._s_addr == NULL) {
3897                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3898                                 net->src_addr_selected = 0;
3899                                 goto no_route;
3900                         }
3901                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3902                 } else {
3903                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3904                         /* KAME hack: embed scopeid */
3905                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3906                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3907                                 return (EINVAL);
3908                         }
3909                         if (over_addr == NULL) {
3910                                 struct sctp_ifa *_lsrc;
3911
3912                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3913                                     net,
3914                                     out_of_asoc_ok,
3915                                     vrf_id);
3916                                 if (_lsrc == NULL) {
3917                                         goto no_route;
3918                                 }
3919                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3920                                 sctp_free_ifa(_lsrc);
3921                         } else {
3922                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3923                                 SCTP_RTALLOC(ro, vrf_id);
3924                         }
3925                         (void)sa6_recoverscope(sin6);
3926                 }
3927                 lsa6->sin6_port = inp->sctp_lport;
3928
3929                 if (ro->ro_rt == NULL) {
3930                         /*
3931                          * src addr selection failed to find a route (or
3932                          * valid source addr), so we can't get there from
3933                          * here!
3934                          */
3935                         goto no_route;
3936                 }
3937                 /*
3938                  * XXX: sa6 may not have a valid sin6_scope_id in the
3939                  * non-SCOPEDROUTING case.
3940                  */
3941                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3942                 lsa6_storage.sin6_family = AF_INET6;
3943                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3944                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3945                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3946                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3947                         sctp_m_freem(m);
3948                         return (error);
3949                 }
3950                 /* XXX */
3951                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3952                 lsa6_storage.sin6_port = inp->sctp_lport;
3953                 lsa6 = &lsa6_storage;
3954                 ip6h->ip6_src = lsa6->sin6_addr;
3955
3956                 if (port) {
3957                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3958                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3959                         udp->uh_dport = port;
3960                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3961                         udp->uh_sum = 0;
3962                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3963                 } else {
3964                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3965                 }
3966
3967                 sctphdr->src_port = src_port;
3968                 sctphdr->dest_port = dest_port;
3969                 sctphdr->v_tag = v_tag;
3970                 sctphdr->checksum = 0;
3971
3972                 /*
3973                  * We set the hop limit now since there is a good chance
3974                  * that our ro pointer is now filled
3975                  */
3976                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3977                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3978
3979 #ifdef SCTP_DEBUG
3980                 /* Copy to be sure something bad is not happening */
3981                 sin6->sin6_addr = ip6h->ip6_dst;
3982                 lsa6->sin6_addr = ip6h->ip6_src;
3983 #endif
3984
3985                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3986                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3987                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3988                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3989                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3990                 if (net) {
3991                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3992                         /* preserve the port and scope for link local send */
3993                         prev_scope = sin6->sin6_scope_id;
3994                         prev_port = sin6->sin6_port;
3995                 }
3996                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3997                         /* failed to prepend data, give up */
3998                         sctp_m_freem(m);
3999                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4000                         return (ENOMEM);
4001                 }
4002 #ifdef  SCTP_PACKET_LOGGING
4003                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4004                         sctp_packet_log(m, packet_length);
4005 #endif
4006                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4007                 if (port) {
4008                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4009                             (stcb) &&
4010                             (stcb->asoc.loopback_scope))) {
4011                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4012                                 SCTP_STAT_INCR(sctps_sendswcrc);
4013                         } else {
4014                                 SCTP_STAT_INCR(sctps_sendnocrc);
4015                         }
4016                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4017                                 udp->uh_sum = 0xffff;
4018                         }
4019                 } else {
4020                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4021                             (stcb) &&
4022                             (stcb->asoc.loopback_scope))) {
4023                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4024                                 m->m_pkthdr.csum_data = 0;
4025                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4026                         } else {
4027                                 SCTP_STAT_INCR(sctps_sendnocrc);
4028                         }
4029                 }
4030                 /* send it out. table id is taken from stcb */
4031 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4032                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4033                         so = SCTP_INP_SO(inp);
4034                         SCTP_SOCKET_UNLOCK(so, 0);
4035                 }
4036 #endif
4037                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4038 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4039                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4040                         atomic_add_int(&stcb->asoc.refcnt, 1);
4041                         SCTP_TCB_UNLOCK(stcb);
4042                         SCTP_SOCKET_LOCK(so, 0);
4043                         SCTP_TCB_LOCK(stcb);
4044                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4045                 }
4046 #endif
4047                 if (net) {
4048                         /* for link local this must be done */
4049                         sin6->sin6_scope_id = prev_scope;
4050                         sin6->sin6_port = prev_port;
4051                 }
4052                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4053                 SCTP_STAT_INCR(sctps_sendpackets);
4054                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4055                 if (ret) {
4056                         SCTP_STAT_INCR(sctps_senderrors);
4057                 }
4058                 if (net == NULL) {
4059                         /* Now if we had a temp route free it */
4060                         if (ro->ro_rt) {
4061                                 RTFREE(ro->ro_rt);
4062                         }
4063                 } else {
4064                         /* PMTU check versus smallest asoc MTU goes here */
4065                         if (ro->ro_rt == NULL) {
4066                                 /* Route was freed */
4067                                 if (net->ro._s_addr &&
4068                                     net->src_addr_selected) {
4069                                         sctp_free_ifa(net->ro._s_addr);
4070                                         net->ro._s_addr = NULL;
4071                                 }
4072                                 net->src_addr_selected = 0;
4073                         }
4074                         if ((ro->ro_rt != NULL) &&
4075                             (net->ro._s_addr)) {
4076                                 uint32_t mtu;
4077
4078                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4079                                 if (mtu &&
4080                                     (stcb->asoc.smallest_mtu > mtu)) {
4081 #ifdef SCTP_PRINT_FOR_B_AND_M
4082                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
4083                                             mtu);
4084 #endif
4085                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4086                                         net->mtu = mtu;
4087                                         if (net->port) {
4088                                                 net->mtu -= sizeof(struct udphdr);
4089                                         }
4090                                 }
4091                         } else if (ifp) {
4092                                 if (ND_IFINFO(ifp)->linkmtu &&
4093                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4094 #ifdef SCTP_PRINT_FOR_B_AND_M
4095                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
4096                                             ND_IFINFO(ifp)->linkmtu);
4097 #endif
4098                                         sctp_mtu_size_reset(inp,
4099                                             &stcb->asoc,
4100                                             ND_IFINFO(ifp)->linkmtu);
4101                                 }
4102                         }
4103                 }
4104                 return (ret);
4105         }
4106 #endif
4107         else {
4108                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4109                     ((struct sockaddr *)to)->sa_family);
4110                 sctp_m_freem(m);
4111                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4112                 return (EFAULT);
4113         }
4114 }
4115
4116
4117 void
4118 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4119 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4120     SCTP_UNUSED
4121 #endif
4122 )
4123 {
4124         struct mbuf *m, *m_at, *mp_last;
4125         struct sctp_nets *net;
4126         struct sctp_init_chunk *init;
4127         struct sctp_supported_addr_param *sup_addr;
4128         struct sctp_adaptation_layer_indication *ali;
4129         struct sctp_ecn_supported_param *ecn;
4130         struct sctp_prsctp_supported_param *prsctp;
4131         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4132         struct sctp_supported_chunk_types_param *pr_supported;
4133         int cnt_inits_to = 0;
4134         int padval, ret;
4135         int num_ext;
4136         int p_len;
4137
4138         /* INIT's always go to the primary (and usually ONLY address) */
4139         mp_last = NULL;
4140         net = stcb->asoc.primary_destination;
4141         if (net == NULL) {
4142                 net = TAILQ_FIRST(&stcb->asoc.nets);
4143                 if (net == NULL) {
4144                         /* TSNH */
4145                         return;
4146                 }
4147                 /* we confirm any address we send an INIT to */
4148                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4149                 (void)sctp_set_primary_addr(stcb, NULL, net);
4150         } else {
4151                 /* we confirm any address we send an INIT to */
4152                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4153         }
4154         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4155 #ifdef INET6
4156         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4157                 /*
4158                  * special hook, if we are sending to link local it will not
4159                  * show up in our private address count.
4160                  */
4161                 struct sockaddr_in6 *sin6l;
4162
4163                 sin6l = &net->ro._l_addr.sin6;
4164                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4165                         cnt_inits_to = 1;
4166         }
4167 #endif
4168         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4169                 /* This case should not happen */
4170                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4171                 return;
4172         }
4173         /* start the INIT timer */
4174         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4175
4176         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4177         if (m == NULL) {
4178                 /* No memory, INIT timer will re-attempt. */
4179                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4180                 return;
4181         }
4182         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4183         /*
4184          * assume peer supports asconf in order to be able to queue local
4185          * address changes while an INIT is in flight and before the assoc
4186          * is established.
4187          */
4188         stcb->asoc.peer_supports_asconf = 1;
4189         /* Now lets put the SCTP header in place */
4190         init = mtod(m, struct sctp_init_chunk *);
4191         /* now the chunk header */
4192         init->ch.chunk_type = SCTP_INITIATION;
4193         init->ch.chunk_flags = 0;
4194         /* fill in later from mbuf we build */
4195         init->ch.chunk_length = 0;
4196         /* place in my tag */
4197         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4198         /* set up some of the credits. */
4199         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4200             SCTP_MINIMAL_RWND));
4201
4202         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4203         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4204         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4205         /* now the address restriction */
4206         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4207             sizeof(*init));
4208         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4209 #ifdef INET6
4210         /* we support 2 types: IPv6/IPv4 */
4211         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4212         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4213         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4214 #else
4215         /* we support 1 type: IPv4 */
4216         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4217         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4218         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4219 #endif
4220         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4221         /* adaptation layer indication parameter */
4222         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4223         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4224         ali->ph.param_length = htons(sizeof(*ali));
4225         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4226         SCTP_BUF_LEN(m) += sizeof(*ali);
4227         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4228
4229         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4230                 /* Add NAT friendly parameter */
4231                 struct sctp_paramhdr *ph;
4232
4233                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4234                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4235                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4236                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4237                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4238         }
4239         /* now any cookie time extensions */
4240         if (stcb->asoc.cookie_preserve_req) {
4241                 struct sctp_cookie_perserve_param *cookie_preserve;
4242
4243                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4244                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4245                 cookie_preserve->ph.param_length = htons(
4246                     sizeof(*cookie_preserve));
4247                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4248                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4249                 ecn = (struct sctp_ecn_supported_param *)(
4250                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4251                 stcb->asoc.cookie_preserve_req = 0;
4252         }
4253         /* ECN parameter */
4254         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4255                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4256                 ecn->ph.param_length = htons(sizeof(*ecn));
4257                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4258                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4259                     sizeof(*ecn));
4260         } else {
4261                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4262         }
4263         /* And now tell the peer we do pr-sctp */
4264         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4265         prsctp->ph.param_length = htons(sizeof(*prsctp));
4266         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4267
4268         /* And now tell the peer we do all the extensions */
4269         pr_supported = (struct sctp_supported_chunk_types_param *)
4270             ((caddr_t)prsctp + sizeof(*prsctp));
4271         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4272         num_ext = 0;
4273         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4274         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4275         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4276         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4277         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4278         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4279                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4280         }
4281         /*
4282          * EY  if the initiator supports nr_sacks, need to report that to
4283          * responder in INIT chunk
4284          */
4285         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off)) {
4286                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4287         }
4288         p_len = sizeof(*pr_supported) + num_ext;
4289         pr_supported->ph.param_length = htons(p_len);
4290         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4291         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4292
4293
4294         /* ECN nonce: And now tell the peer we support ECN nonce */
4295         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4296                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4297                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4298                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4299                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4300                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4301         }
4302         /* add authentication parameters */
4303         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4304                 struct sctp_auth_random *randp;
4305                 struct sctp_auth_hmac_algo *hmacs;
4306                 struct sctp_auth_chunk_list *chunks;
4307
4308                 /* attach RANDOM parameter, if available */
4309                 if (stcb->asoc.authinfo.random != NULL) {
4310                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4311                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4312                         /* random key already contains the header */
4313                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4314                         /* zero out any padding required */
4315                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4316                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4317                 }
4318                 /* add HMAC_ALGO parameter */
4319                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4320                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4321                     (uint8_t *) hmacs->hmac_ids);
4322                 if (p_len > 0) {
4323                         p_len += sizeof(*hmacs);
4324                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4325                         hmacs->ph.param_length = htons(p_len);
4326                         /* zero out any padding required */
4327                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4328                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4329                 }
4330                 /* add CHUNKS parameter */
4331                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4332                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4333                     chunks->chunk_types);
4334                 if (p_len > 0) {
4335                         p_len += sizeof(*chunks);
4336                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4337                         chunks->ph.param_length = htons(p_len);
4338                         /* zero out any padding required */
4339                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4340                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4341                 }
4342         }
4343         m_at = m;
4344         /* now the addresses */
4345         {
4346                 struct sctp_scoping scp;
4347
4348                 /*
4349                  * To optimize this we could put the scoping stuff into a
4350                  * structure and remove the individual uint8's from the
4351                  * assoc structure. Then we could just sifa in the address
4352                  * within the stcb.. but for now this is a quick hack to get
4353                  * the address stuff teased apart.
4354                  */
4355                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4356                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4357                 scp.loopback_scope = stcb->asoc.loopback_scope;
4358                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4359                 scp.local_scope = stcb->asoc.local_scope;
4360                 scp.site_scope = stcb->asoc.site_scope;
4361
4362                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4363         }
4364
4365         /* calulate the size and update pkt header and chunk header */
4366         p_len = 0;
4367         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4368                 if (SCTP_BUF_NEXT(m_at) == NULL)
4369                         mp_last = m_at;
4370                 p_len += SCTP_BUF_LEN(m_at);
4371         }
4372         init->ch.chunk_length = htons(p_len);
4373         /*
4374          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4375          * here since the timer will drive a retranmission.
4376          */
4377
4378         /* I don't expect this to execute but we will be safe here */
4379         padval = p_len % 4;
4380         if ((padval) && (mp_last)) {
4381                 /*
4382                  * The compiler worries that mp_last may not be set even
4383                  * though I think it is impossible :-> however we add
4384                  * mp_last here just in case.
4385                  */
4386                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4387                 if (ret) {
4388                         /* Houston we have a problem, no space */
4389                         sctp_m_freem(m);
4390                         return;
4391                 }
4392                 p_len += padval;
4393         }
4394         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4395         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4396             (struct sockaddr *)&net->ro._l_addr,
4397             m, 0, NULL, 0, 0, 0, NULL, 0,
4398             inp->sctp_lport, stcb->rport, htonl(0),
4399             net->port, so_locked, NULL);
4400         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4401         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4402         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4403 }
4404
4405 struct mbuf *
4406 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4407     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4408 {
4409         /*
4410          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4411          * being equal to the beginning of the params i.e. (iphlen +
4412          * sizeof(struct sctp_init_msg) parse through the parameters to the
4413          * end of the mbuf verifying that all parameters are known.
4414          *
4415          * For unknown parameters build and return a mbuf with
4416          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4417          * processing this chunk stop, and set *abort_processing to 1.
4418          *
4419          * By having param_offset be pre-set to where parameters begin it is
4420          * hoped that this routine may be reused in the future by new
4421          * features.
4422          */
4423         struct sctp_paramhdr *phdr, params;
4424
4425         struct mbuf *mat, *op_err;
4426         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4427         int at, limit, pad_needed;
4428         uint16_t ptype, plen, padded_size;
4429         int err_at;
4430
4431         *abort_processing = 0;
4432         mat = in_initpkt;
4433         err_at = 0;
4434         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4435         at = param_offset;
4436         op_err = NULL;
4437         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4438         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4439         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4440                 ptype = ntohs(phdr->param_type);
4441                 plen = ntohs(phdr->param_length);
4442                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4443                         /* wacked parameter */
4444                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4445                         goto invalid_size;
4446                 }
4447                 limit -= SCTP_SIZE32(plen);
4448                 /*-
4449                  * All parameters for all chunks that we know/understand are
4450                  * listed here. We process them other places and make
4451                  * appropriate stop actions per the upper bits. However this
4452                  * is the generic routine processor's can call to get back
4453                  * an operr.. to either incorporate (init-ack) or send.
4454                  */
4455                 padded_size = SCTP_SIZE32(plen);
4456                 switch (ptype) {
4457                         /* Param's with variable size */
4458                 case SCTP_HEARTBEAT_INFO:
4459                 case SCTP_STATE_COOKIE:
4460                 case SCTP_UNRECOG_PARAM:
4461                 case SCTP_ERROR_CAUSE_IND:
4462                         /* ok skip fwd */
4463                         at += padded_size;
4464                         break;
4465                         /* Param's with variable size within a range */
4466                 case SCTP_CHUNK_LIST:
4467                 case SCTP_SUPPORTED_CHUNK_EXT:
4468                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4469                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4470                                 goto invalid_size;
4471                         }
4472                         at += padded_size;
4473                         break;
4474                 case SCTP_SUPPORTED_ADDRTYPE:
4475                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4476                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4477                                 goto invalid_size;
4478                         }
4479                         at += padded_size;
4480                         break;
4481                 case SCTP_RANDOM:
4482                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4483                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4484                                 goto invalid_size;
4485                         }
4486                         at += padded_size;
4487                         break;
4488                 case SCTP_SET_PRIM_ADDR:
4489                 case SCTP_DEL_IP_ADDRESS:
4490                 case SCTP_ADD_IP_ADDRESS:
4491                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4492                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4493                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4494                                 goto invalid_size;
4495                         }
4496                         at += padded_size;
4497                         break;
4498                         /* Param's with a fixed size */
4499                 case SCTP_IPV4_ADDRESS:
4500                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4501                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4502                                 goto invalid_size;
4503                         }
4504                         at += padded_size;
4505                         break;
4506                 case SCTP_IPV6_ADDRESS:
4507                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4508                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4509                                 goto invalid_size;
4510                         }
4511                         at += padded_size;
4512                         break;
4513                 case SCTP_COOKIE_PRESERVE:
4514                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4515                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4516                                 goto invalid_size;
4517                         }
4518                         at += padded_size;
4519                         break;
4520                 case SCTP_HAS_NAT_SUPPORT:
4521                         *nat_friendly = 1;
4522                         /* fall through */
4523                 case SCTP_ECN_NONCE_SUPPORTED:
4524                 case SCTP_PRSCTP_SUPPORTED:
4525
4526                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4527                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4528                                 goto invalid_size;
4529                         }
4530                         at += padded_size;
4531                         break;
4532                 case SCTP_ECN_CAPABLE:
4533                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4534                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4535                                 goto invalid_size;
4536                         }
4537                         at += padded_size;
4538                         break;
4539                 case SCTP_ULP_ADAPTATION:
4540                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4541                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4542                                 goto invalid_size;
4543                         }
4544                         at += padded_size;
4545                         break;
4546                 case SCTP_SUCCESS_REPORT:
4547                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4548                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4549                                 goto invalid_size;
4550                         }
4551                         at += padded_size;
4552                         break;
4553                 case SCTP_HOSTNAME_ADDRESS:
4554                         {
4555                                 /* We can NOT handle HOST NAME addresses!! */
4556                                 int l_len;
4557
4558                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4559                                 *abort_processing = 1;
4560                                 if (op_err == NULL) {
4561                                         /* Ok need to try to get a mbuf */
4562 #ifdef INET6
4563                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4564 #else
4565                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4566 #endif
4567                                         l_len += plen;
4568                                         l_len += sizeof(struct sctp_paramhdr);
4569                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4570                                         if (op_err) {
4571                                                 SCTP_BUF_LEN(op_err) = 0;
4572                                                 /*
4573                                                  * pre-reserve space for ip
4574                                                  * and sctp header  and
4575                                                  * chunk hdr
4576                                                  */
4577 #ifdef INET6
4578                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4579 #else
4580                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4581 #endif
4582                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4583                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4584                                         }
4585                                 }
4586                                 if (op_err) {
4587                                         /* If we have space */
4588                                         struct sctp_paramhdr s;
4589
4590                                         if (err_at % 4) {
4591                                                 uint32_t cpthis = 0;
4592
4593                                                 pad_needed = 4 - (err_at % 4);
4594                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4595                                                 err_at += pad_needed;
4596                                         }
4597                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4598                                         s.param_length = htons(sizeof(s) + plen);
4599                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4600                                         err_at += sizeof(s);
4601                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4602                                         if (phdr == NULL) {
4603                                                 sctp_m_freem(op_err);
4604                                                 /*
4605                                                  * we are out of memory but
4606                                                  * we still need to have a
4607                                                  * look at what to do (the
4608                                                  * system is in trouble
4609                                                  * though).
4610                                                  */
4611                                                 return (NULL);
4612                                         }
4613                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4614                                         err_at += plen;
4615                                 }
4616                                 return (op_err);
4617                                 break;
4618                         }
4619                 default:
4620                         /*
4621                          * we do not recognize the parameter figure out what
4622                          * we do.
4623                          */
4624                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4625                         if ((ptype & 0x4000) == 0x4000) {
4626                                 /* Report bit is set?? */
4627                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4628                                 if (op_err == NULL) {
4629                                         int l_len;
4630
4631                                         /* Ok need to try to get an mbuf */
4632 #ifdef INET6
4633                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4634 #else
4635                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4636 #endif
4637                                         l_len += plen;
4638                                         l_len += sizeof(struct sctp_paramhdr);
4639                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4640                                         if (op_err) {
4641                                                 SCTP_BUF_LEN(op_err) = 0;
4642 #ifdef INET6
4643                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4644 #else
4645                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4646 #endif
4647                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4648                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4649                                         }
4650                                 }
4651                                 if (op_err) {
4652                                         /* If we have space */
4653                                         struct sctp_paramhdr s;
4654
4655                                         if (err_at % 4) {
4656                                                 uint32_t cpthis = 0;
4657
4658                                                 pad_needed = 4 - (err_at % 4);
4659                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4660                                                 err_at += pad_needed;
4661                                         }
4662                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4663                                         s.param_length = htons(sizeof(s) + plen);
4664                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4665                                         err_at += sizeof(s);
4666                                         if (plen > sizeof(tempbuf)) {
4667                                                 plen = sizeof(tempbuf);
4668                                         }
4669                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4670                                         if (phdr == NULL) {
4671                                                 sctp_m_freem(op_err);
4672                                                 /*
4673                                                  * we are out of memory but
4674                                                  * we still need to have a
4675                                                  * look at what to do (the
4676                                                  * system is in trouble
4677                                                  * though).
4678                                                  */
4679                                                 op_err = NULL;
4680                                                 goto more_processing;
4681                                         }
4682                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4683                                         err_at += plen;
4684                                 }
4685                         }
4686         more_processing:
4687                         if ((ptype & 0x8000) == 0x0000) {
4688                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4689                                 return (op_err);
4690                         } else {
4691                                 /* skip this chunk and continue processing */
4692                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4693                                 at += SCTP_SIZE32(plen);
4694                         }
4695                         break;
4696
4697                 }
4698                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4699         }
4700         return (op_err);
4701 invalid_size:
4702         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4703         *abort_processing = 1;
4704         if ((op_err == NULL) && phdr) {
4705                 int l_len;
4706
4707 #ifdef INET6
4708                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4709 #else
4710                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4711 #endif
4712                 l_len += (2 * sizeof(struct sctp_paramhdr));
4713                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4714                 if (op_err) {
4715                         SCTP_BUF_LEN(op_err) = 0;
4716 #ifdef INET6
4717                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4718 #else
4719                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4720 #endif
4721                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4722                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4723                 }
4724         }
4725         if ((op_err) && phdr) {
4726                 struct sctp_paramhdr s;
4727
4728                 if (err_at % 4) {
4729                         uint32_t cpthis = 0;
4730
4731                         pad_needed = 4 - (err_at % 4);
4732                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4733                         err_at += pad_needed;
4734                 }
4735                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4736                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4737                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4738                 err_at += sizeof(s);
4739                 /* Only copy back the p-hdr that caused the issue */
4740                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4741         }
4742         return (op_err);
4743 }
4744
4745 static int
4746 sctp_are_there_new_addresses(struct sctp_association *asoc,
4747     struct mbuf *in_initpkt, int iphlen, int offset)
4748 {
4749         /*
4750          * Given a INIT packet, look through the packet to verify that there
4751          * are NO new addresses. As we go through the parameters add reports
4752          * of any un-understood parameters that require an error.  Also we
4753          * must return (1) to drop the packet if we see a un-understood
4754          * parameter that tells us to drop the chunk.
4755          */
4756         struct sockaddr_in sin4, *sa4;
4757
4758 #ifdef INET6
4759         struct sockaddr_in6 sin6, *sa6;
4760
4761 #endif
4762         struct sockaddr *sa_touse;
4763         struct sockaddr *sa;
4764         struct sctp_paramhdr *phdr, params;
4765         struct ip *iph;
4766
4767 #ifdef INET6
4768         struct ip6_hdr *ip6h;
4769
4770 #endif
4771         struct mbuf *mat;
4772         uint16_t ptype, plen;
4773         int err_at;
4774         uint8_t fnd;
4775         struct sctp_nets *net;
4776
4777         memset(&sin4, 0, sizeof(sin4));
4778 #ifdef INET6
4779         memset(&sin6, 0, sizeof(sin6));
4780 #endif
4781         sin4.sin_family = AF_INET;
4782         sin4.sin_len = sizeof(sin4);
4783 #ifdef INET6
4784         sin6.sin6_family = AF_INET6;
4785         sin6.sin6_len = sizeof(sin6);
4786 #endif
4787         sa_touse = NULL;
4788         /* First what about the src address of the pkt ? */
4789         iph = mtod(in_initpkt, struct ip *);
4790         switch (iph->ip_v) {
4791         case IPVERSION:
4792                 /* source addr is IPv4 */
4793                 sin4.sin_addr = iph->ip_src;
4794                 sa_touse = (struct sockaddr *)&sin4;
4795                 break;
4796 #ifdef INET6
4797         case IPV6_VERSION >> 4:
4798                 /* source addr is IPv6 */
4799                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4800                 sin6.sin6_addr = ip6h->ip6_src;
4801                 sa_touse = (struct sockaddr *)&sin6;
4802                 break;
4803 #endif
4804         default:
4805                 return (1);
4806         }
4807
4808         fnd = 0;
4809         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4810                 sa = (struct sockaddr *)&net->ro._l_addr;
4811                 if (sa->sa_family == sa_touse->sa_family) {
4812                         if (sa->sa_family == AF_INET) {
4813                                 sa4 = (struct sockaddr_in *)sa;
4814                                 if (sa4->sin_addr.s_addr ==
4815                                     sin4.sin_addr.s_addr) {
4816                                         fnd = 1;
4817                                         break;
4818                                 }
4819                         }
4820 #ifdef INET6
4821                         if (sa->sa_family == AF_INET6) {
4822                                 sa6 = (struct sockaddr_in6 *)sa;
4823                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4824                                     &sin6)) {
4825                                         fnd = 1;
4826                                         break;
4827                                 }
4828                         }
4829 #endif
4830                 }
4831         }
4832         if (fnd == 0) {
4833                 /* New address added! no need to look futher. */
4834                 return (1);
4835         }
4836         /* Ok so far lets munge through the rest of the packet */
4837         mat = in_initpkt;
4838         err_at = 0;
4839         sa_touse = NULL;
4840         offset += sizeof(struct sctp_init_chunk);
4841         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4842         while (phdr) {
4843                 ptype = ntohs(phdr->param_type);
4844                 plen = ntohs(phdr->param_length);
4845                 if (ptype == SCTP_IPV4_ADDRESS) {
4846                         struct sctp_ipv4addr_param *p4, p4_buf;
4847
4848                         phdr = sctp_get_next_param(mat, offset,
4849                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4850                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4851                             phdr == NULL) {
4852                                 return (1);
4853                         }
4854                         p4 = (struct sctp_ipv4addr_param *)phdr;
4855                         sin4.sin_addr.s_addr = p4->addr;
4856                         sa_touse = (struct sockaddr *)&sin4;
4857                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4858                         struct sctp_ipv6addr_param *p6, p6_buf;
4859
4860                         phdr = sctp_get_next_param(mat, offset,
4861                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4862                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4863                             phdr == NULL) {
4864                                 return (1);
4865                         }
4866                         p6 = (struct sctp_ipv6addr_param *)phdr;
4867 #ifdef INET6
4868                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4869                             sizeof(p6->addr));
4870 #endif
4871                         sa_touse = (struct sockaddr *)&sin4;
4872                 }
4873                 if (sa_touse) {
4874                         /* ok, sa_touse points to one to check */
4875                         fnd = 0;
4876                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4877                                 sa = (struct sockaddr *)&net->ro._l_addr;
4878                                 if (sa->sa_family != sa_touse->sa_family) {
4879                                         continue;
4880                                 }
4881                                 if (sa->sa_family == AF_INET) {
4882                                         sa4 = (struct sockaddr_in *)sa;
4883                                         if (sa4->sin_addr.s_addr ==
4884                                             sin4.sin_addr.s_addr) {
4885                                                 fnd = 1;
4886                                                 break;
4887                                         }
4888                                 }
4889 #ifdef INET6
4890                                 if (sa->sa_family == AF_INET6) {
4891                                         sa6 = (struct sockaddr_in6 *)sa;
4892                                         if (SCTP6_ARE_ADDR_EQUAL(
4893                                             sa6, &sin6)) {
4894                                                 fnd = 1;
4895                                                 break;
4896                                         }
4897                                 }
4898 #endif
4899                         }
4900                         if (!fnd) {
4901                                 /* New addr added! no need to look further */
4902                                 return (1);
4903                         }
4904                 }
4905                 offset += SCTP_SIZE32(plen);
4906                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4907         }
4908         return (0);
4909 }
4910
4911 /*
4912  * Given a MBUF chain that was sent into us containing an INIT. Build a
4913  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4914  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4915  * message (i.e. the struct sctp_init_msg).
4916  */
4917 void
4918 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4919     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4920     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4921 {
4922         struct sctp_association *asoc;
4923         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4924         struct sctp_init_ack_chunk *initack;
4925         struct sctp_adaptation_layer_indication *ali;
4926         struct sctp_ecn_supported_param *ecn;
4927         struct sctp_prsctp_supported_param *prsctp;
4928         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4929         struct sctp_supported_chunk_types_param *pr_supported;
4930         union sctp_sockstore store, store1, *over_addr;
4931         struct sockaddr_in *sin, *to_sin;
4932
4933 #ifdef INET6
4934         struct sockaddr_in6 *sin6, *to_sin6;
4935
4936 #endif
4937         struct ip *iph;
4938
4939 #ifdef INET6
4940         struct ip6_hdr *ip6;
4941
4942 #endif
4943         struct sockaddr *to;
4944         struct sctp_state_cookie stc;
4945         struct sctp_nets *net = NULL;
4946         uint8_t *signature = NULL;
4947         int cnt_inits_to = 0;
4948         uint16_t his_limit, i_want;
4949         int abort_flag, padval;
4950         int num_ext;
4951         int p_len;
4952         int nat_friendly = 0;
4953         struct socket *so;
4954
4955         if (stcb)
4956                 asoc = &stcb->asoc;
4957         else
4958                 asoc = NULL;
4959         mp_last = NULL;
4960         if ((asoc != NULL) &&
4961             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4962             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4963                 /* new addresses, out of here in non-cookie-wait states */
4964                 /*
4965                  * Send a ABORT, we don't add the new address error clause
4966                  * though we even set the T bit and copy in the 0 tag.. this
4967                  * looks no different than if no listener was present.
4968                  */
4969                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4970                 return;
4971         }
4972         abort_flag = 0;
4973         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4974             (offset + sizeof(struct sctp_init_chunk)),
4975             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4976         if (abort_flag) {
4977 do_a_abort:
4978                 sctp_send_abort(init_pkt, iphlen, sh,
4979                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4980                 return;
4981         }
4982         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4983         if (m == NULL) {
4984                 /* No memory, INIT timer will re-attempt. */
4985                 if (op_err)
4986                         sctp_m_freem(op_err);
4987                 return;
4988         }
4989         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4990
4991         /* the time I built cookie */
4992         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4993
4994         /* populate any tie tags */
4995         if (asoc != NULL) {
4996                 /* unlock before tag selections */
4997                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4998                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4999                 stc.cookie_life = asoc->cookie_life;
5000                 net = asoc->primary_destination;
5001         } else {
5002                 stc.tie_tag_my_vtag = 0;
5003                 stc.tie_tag_peer_vtag = 0;
5004                 /* life I will award this cookie */
5005                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5006         }
5007
5008         /* copy in the ports for later check */
5009         stc.myport = sh->dest_port;
5010         stc.peerport = sh->src_port;
5011
5012         /*
5013          * If we wanted to honor cookie life extentions, we would add to
5014          * stc.cookie_life. For now we should NOT honor any extension
5015          */
5016         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5017         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5018                 struct inpcb *in_inp;
5019
5020                 /* Its a V6 socket */
5021                 in_inp = (struct inpcb *)inp;
5022                 stc.ipv6_addr_legal = 1;
5023                 /* Now look at the binding flag to see if V4 will be legal */
5024                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5025                         stc.ipv4_addr_legal = 1;
5026                 } else {
5027                         /* V4 addresses are NOT legal on the association */
5028                         stc.ipv4_addr_legal = 0;
5029                 }
5030         } else {
5031                 /* Its a V4 socket, no - V6 */
5032                 stc.ipv4_addr_legal = 1;
5033                 stc.ipv6_addr_legal = 0;
5034         }
5035
5036 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5037         stc.ipv4_scope = 1;
5038 #else
5039         stc.ipv4_scope = 0;
5040 #endif
5041         /* now for scope setup */
5042         memset((caddr_t)&store, 0, sizeof(store));
5043         memset((caddr_t)&store1, 0, sizeof(store1));
5044         sin = &store.sin;
5045         to_sin = &store1.sin;
5046 #ifdef INET6
5047         sin6 = &store.sin6;
5048         to_sin6 = &store1.sin6;
5049 #endif
5050         iph = mtod(init_pkt, struct ip *);
5051         /* establish the to_addr's */
5052         switch (iph->ip_v) {
5053         case IPVERSION:
5054                 to_sin->sin_port = sh->dest_port;
5055                 to_sin->sin_family = AF_INET;
5056                 to_sin->sin_len = sizeof(struct sockaddr_in);
5057                 to_sin->sin_addr = iph->ip_dst;
5058                 break;
5059 #ifdef INET6
5060         case IPV6_VERSION >> 4:
5061                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5062                 to_sin6->sin6_addr = ip6->ip6_dst;
5063                 to_sin6->sin6_scope_id = 0;
5064                 to_sin6->sin6_port = sh->dest_port;
5065                 to_sin6->sin6_family = AF_INET6;
5066                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5067                 break;
5068 #endif
5069         default:
5070                 goto do_a_abort;
5071                 break;
5072         };
5073
5074         if (net == NULL) {
5075                 to = (struct sockaddr *)&store;
5076                 switch (iph->ip_v) {
5077                 case IPVERSION:
5078                         {
5079                                 sin->sin_family = AF_INET;
5080                                 sin->sin_len = sizeof(struct sockaddr_in);
5081                                 sin->sin_port = sh->src_port;
5082                                 sin->sin_addr = iph->ip_src;
5083                                 /* lookup address */
5084                                 stc.address[0] = sin->sin_addr.s_addr;
5085                                 stc.address[1] = 0;
5086                                 stc.address[2] = 0;
5087                                 stc.address[3] = 0;
5088                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5089                                 /* local from address */
5090                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5091                                 stc.laddress[1] = 0;
5092                                 stc.laddress[2] = 0;
5093                                 stc.laddress[3] = 0;
5094                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5095                                 /* scope_id is only for v6 */
5096                                 stc.scope_id = 0;
5097 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5098                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5099                                         stc.ipv4_scope = 1;
5100                                 }
5101 #else
5102                                 stc.ipv4_scope = 1;
5103 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5104                                 /* Must use the address in this case */
5105                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5106                                         stc.loopback_scope = 1;
5107                                         stc.ipv4_scope = 1;
5108                                         stc.site_scope = 1;
5109                                         stc.local_scope = 0;
5110                                 }
5111                                 break;
5112                         }
5113 #ifdef INET6
5114                 case IPV6_VERSION >> 4:
5115                         {
5116                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5117                                 sin6->sin6_family = AF_INET6;
5118                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5119                                 sin6->sin6_port = sh->src_port;
5120                                 sin6->sin6_addr = ip6->ip6_src;
5121                                 /* lookup address */
5122                                 memcpy(&stc.address, &sin6->sin6_addr,
5123                                     sizeof(struct in6_addr));
5124                                 sin6->sin6_scope_id = 0;
5125                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5126                                 stc.scope_id = 0;
5127                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5128                                         /*
5129                                          * FIX ME: does this have scope from
5130                                          * rcvif?
5131                                          */
5132                                         (void)sa6_recoverscope(sin6);
5133                                         stc.scope_id = sin6->sin6_scope_id;
5134                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5135                                         stc.loopback_scope = 1;
5136                                         stc.local_scope = 0;
5137                                         stc.site_scope = 1;
5138                                         stc.ipv4_scope = 1;
5139                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5140                                         /*
5141                                          * If the new destination is a
5142                                          * LINK_LOCAL we must have common
5143                                          * both site and local scope. Don't
5144                                          * set local scope though since we
5145                                          * must depend on the source to be
5146                                          * added implicitly. We cannot
5147                                          * assure just because we share one
5148                                          * link that all links are common.
5149                                          */
5150                                         stc.local_scope = 0;
5151                                         stc.site_scope = 1;
5152                                         stc.ipv4_scope = 1;
5153                                         /*
5154                                          * we start counting for the private
5155                                          * address stuff at 1. since the
5156                                          * link local we source from won't
5157                                          * show up in our scoped count.
5158                                          */
5159                                         cnt_inits_to = 1;
5160                                         /*
5161                                          * pull out the scope_id from
5162                                          * incoming pkt
5163                                          */
5164                                         /*
5165                                          * FIX ME: does this have scope from
5166                                          * rcvif?
5167                                          */
5168                                         (void)sa6_recoverscope(sin6);
5169                                         stc.scope_id = sin6->sin6_scope_id;
5170                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5171                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5172                                         /*
5173                                          * If the new destination is
5174                                          * SITE_LOCAL then we must have site
5175                                          * scope in common.
5176                                          */
5177                                         stc.site_scope = 1;
5178                                 }
5179                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5180                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5181                                 break;
5182                         }
5183 #endif
5184                 default:
5185                         /* TSNH */
5186                         goto do_a_abort;
5187                         break;
5188                 }
5189         } else {
5190                 /* set the scope per the existing tcb */
5191
5192 #ifdef INET6
5193                 struct sctp_nets *lnet;
5194
5195 #endif
5196
5197                 stc.loopback_scope = asoc->loopback_scope;
5198                 stc.ipv4_scope = asoc->ipv4_local_scope;
5199                 stc.site_scope = asoc->site_scope;
5200                 stc.local_scope = asoc->local_scope;
5201 #ifdef INET6
5202                 /* Why do we not consider IPv4 LL addresses? */
5203                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5204                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5205                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5206                                         /*
5207                                          * if we have a LL address, start
5208                                          * counting at 1.
5209                                          */
5210                                         cnt_inits_to = 1;
5211                                 }
5212                         }
5213                 }
5214 #endif
5215                 /* use the net pointer */
5216                 to = (struct sockaddr *)&net->ro._l_addr;
5217                 switch (to->sa_family) {
5218                 case AF_INET:
5219                         sin = (struct sockaddr_in *)to;
5220                         stc.address[0] = sin->sin_addr.s_addr;
5221                         stc.address[1] = 0;
5222                         stc.address[2] = 0;
5223                         stc.address[3] = 0;
5224                         stc.addr_type = SCTP_IPV4_ADDRESS;
5225                         if (net->src_addr_selected == 0) {
5226                                 /*
5227                                  * strange case here, the INIT should have
5228                                  * did the selection.
5229                                  */
5230                                 net->ro._s_addr = sctp_source_address_selection(inp,
5231                                     stcb, (sctp_route_t *) & net->ro,
5232                                     net, 0, vrf_id);
5233                                 if (net->ro._s_addr == NULL)
5234                                         return;
5235
5236                                 net->src_addr_selected = 1;
5237
5238                         }
5239                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5240                         stc.laddress[1] = 0;
5241                         stc.laddress[2] = 0;
5242                         stc.laddress[3] = 0;
5243                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5244                         break;
5245 #ifdef INET6
5246                 case AF_INET6:
5247                         sin6 = (struct sockaddr_in6 *)to;
5248                         memcpy(&stc.address, &sin6->sin6_addr,
5249                             sizeof(struct in6_addr));
5250                         stc.addr_type = SCTP_IPV6_ADDRESS;
5251                         if (net->src_addr_selected == 0) {
5252                                 /*
5253                                  * strange case here, the INIT should have
5254                                  * did the selection.
5255                                  */
5256                                 net->ro._s_addr = sctp_source_address_selection(inp,
5257                                     stcb, (sctp_route_t *) & net->ro,
5258                                     net, 0, vrf_id);
5259                                 if (net->ro._s_addr == NULL)
5260                                         return;
5261
5262                                 net->src_addr_selected = 1;
5263                         }
5264                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5265                             sizeof(struct in6_addr));
5266                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5267                         break;
5268 #endif
5269                 }
5270         }
5271         /* Now lets put the SCTP header in place */
5272         initack = mtod(m, struct sctp_init_ack_chunk *);
5273         /* Save it off for quick ref */
5274         stc.peers_vtag = init_chk->init.initiate_tag;
5275         /* who are we */
5276         memcpy(stc.identification, SCTP_VERSION_STRING,
5277             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5278         /* now the chunk header */
5279         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5280         initack->ch.chunk_flags = 0;
5281         /* fill in later from mbuf we build */
5282         initack->ch.chunk_length = 0;
5283         /* place in my tag */
5284         if ((asoc != NULL) &&
5285             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5286             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5287             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5288                 /* re-use the v-tags and init-seq here */
5289                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5290                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5291         } else {
5292                 uint32_t vtag, itsn;
5293
5294                 if (hold_inp_lock) {
5295                         SCTP_INP_INCR_REF(inp);
5296                         SCTP_INP_RUNLOCK(inp);
5297                 }
5298                 if (asoc) {
5299                         atomic_add_int(&asoc->refcnt, 1);
5300                         SCTP_TCB_UNLOCK(stcb);
5301         new_tag:
5302                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5303                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5304                                 /*
5305                                  * Got a duplicate vtag on some guy behind a
5306                                  * nat make sure we don't use it.
5307                                  */
5308                                 goto new_tag;
5309                         }
5310                         initack->init.initiate_tag = htonl(vtag);
5311                         /* get a TSN to use too */
5312                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5313                         initack->init.initial_tsn = htonl(itsn);
5314                         SCTP_TCB_LOCK(stcb);
5315                         atomic_add_int(&asoc->refcnt, -1);
5316                 } else {
5317                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5318                         initack->init.initiate_tag = htonl(vtag);
5319                         /* get a TSN to use too */
5320                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5321                 }
5322                 if (hold_inp_lock) {
5323                         SCTP_INP_RLOCK(inp);
5324                         SCTP_INP_DECR_REF(inp);
5325                 }
5326         }
5327         /* save away my tag to */
5328         stc.my_vtag = initack->init.initiate_tag;
5329
5330         /* set up some of the credits. */
5331         so = inp->sctp_socket;
5332         if (so == NULL) {
5333                 /* memory problem */
5334                 sctp_m_freem(m);
5335                 return;
5336         } else {
5337                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5338         }
5339         /* set what I want */
5340         his_limit = ntohs(init_chk->init.num_inbound_streams);
5341         /* choose what I want */
5342         if (asoc != NULL) {
5343                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5344                         i_want = asoc->streamoutcnt;
5345                 } else {
5346                         i_want = inp->sctp_ep.pre_open_stream_count;
5347                 }
5348         } else {
5349                 i_want = inp->sctp_ep.pre_open_stream_count;
5350         }
5351         if (his_limit < i_want) {
5352                 /* I Want more :< */
5353                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5354         } else {
5355                 /* I can have what I want :> */
5356                 initack->init.num_outbound_streams = htons(i_want);
5357         }
5358         /* tell him his limt. */
5359         initack->init.num_inbound_streams =
5360             htons(inp->sctp_ep.max_open_streams_intome);
5361
5362         /* adaptation layer indication parameter */
5363         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5364         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5365         ali->ph.param_length = htons(sizeof(*ali));
5366         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5367         SCTP_BUF_LEN(m) += sizeof(*ali);
5368         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5369
5370         /* ECN parameter */
5371         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5372                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5373                 ecn->ph.param_length = htons(sizeof(*ecn));
5374                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5375
5376                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5377                     sizeof(*ecn));
5378         } else {
5379                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5380         }
5381         /* And now tell the peer we do  pr-sctp */
5382         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5383         prsctp->ph.param_length = htons(sizeof(*prsctp));
5384         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5385         if (nat_friendly) {
5386                 /* Add NAT friendly parameter */
5387                 struct sctp_paramhdr *ph;
5388
5389                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5390                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5391                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5392                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5393         }
5394         /* And now tell the peer we do all the extensions */
5395         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5396         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5397         num_ext = 0;
5398         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5399         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5400         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5401         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5402         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5403         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5404                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5405         /*
5406          * EY  if the sysctl variable is set, tell the assoc. initiator that
5407          * we do nr_sack
5408          */
5409         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5410                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5411         p_len = sizeof(*pr_supported) + num_ext;
5412         pr_supported->ph.param_length = htons(p_len);
5413         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5414         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5415
5416         /* ECN nonce: And now tell the peer we support ECN nonce */
5417         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5418                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5419                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5420                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5421                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5422                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5423         }
5424         /* add authentication parameters */
5425         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5426                 struct sctp_auth_random *randp;
5427                 struct sctp_auth_hmac_algo *hmacs;
5428                 struct sctp_auth_chunk_list *chunks;
5429                 uint16_t random_len;
5430
5431                 /* generate and add RANDOM parameter */
5432                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5433                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5434                 randp->ph.param_type = htons(SCTP_RANDOM);
5435                 p_len = sizeof(*randp) + random_len;
5436                 randp->ph.param_length = htons(p_len);
5437                 SCTP_READ_RANDOM(randp->random_data, random_len);
5438                 /* zero out any padding required */
5439                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5440                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5441
5442                 /* add HMAC_ALGO parameter */
5443                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5444                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5445                     (uint8_t *) hmacs->hmac_ids);
5446                 if (p_len > 0) {
5447                         p_len += sizeof(*hmacs);
5448                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5449                         hmacs->ph.param_length = htons(p_len);
5450                         /* zero out any padding required */
5451                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5452                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5453                 }
5454                 /* add CHUNKS parameter */
5455                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5456                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5457                     chunks->chunk_types);
5458                 if (p_len > 0) {
5459                         p_len += sizeof(*chunks);
5460                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5461                         chunks->ph.param_length = htons(p_len);
5462                         /* zero out any padding required */
5463                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5464                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5465                 }
5466         }
5467         m_at = m;
5468         /* now the addresses */
5469         {
5470                 struct sctp_scoping scp;
5471
5472                 /*
5473                  * To optimize this we could put the scoping stuff into a
5474                  * structure and remove the individual uint8's from the stc
5475                  * structure. Then we could just sifa in the address within
5476                  * the stc.. but for now this is a quick hack to get the
5477                  * address stuff teased apart.
5478                  */
5479                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5480                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5481                 scp.loopback_scope = stc.loopback_scope;
5482                 scp.ipv4_local_scope = stc.ipv4_scope;
5483                 scp.local_scope = stc.local_scope;
5484                 scp.site_scope = stc.site_scope;
5485                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5486         }
5487
5488         /* tack on the operational error if present */
5489         if (op_err) {
5490                 struct mbuf *ol;
5491                 int llen;
5492
5493                 llen = 0;
5494                 ol = op_err;
5495                 while (ol) {
5496                         llen += SCTP_BUF_LEN(ol);
5497                         ol = SCTP_BUF_NEXT(ol);
5498                 }
5499                 if (llen % 4) {
5500                         /* must add a pad to the param */
5501                         uint32_t cpthis = 0;
5502                         int padlen;
5503
5504                         padlen = 4 - (llen % 4);
5505                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5506                 }
5507                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5508                         m_at = SCTP_BUF_NEXT(m_at);
5509                 }
5510                 SCTP_BUF_NEXT(m_at) = op_err;
5511                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5512                         m_at = SCTP_BUF_NEXT(m_at);
5513                 }
5514         }
5515         /* pre-calulate the size and update pkt header and chunk header */
5516         p_len = 0;
5517         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5518                 p_len += SCTP_BUF_LEN(m_tmp);
5519                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5520                         /* m_tmp should now point to last one */
5521                         break;
5522                 }
5523         }
5524
5525         /* Now we must build a cookie */
5526         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5527         if (m_cookie == NULL) {
5528                 /* memory problem */
5529                 sctp_m_freem(m);
5530                 return;
5531         }
5532         /* Now append the cookie to the end and update the space/size */
5533         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5534
5535         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5536                 p_len += SCTP_BUF_LEN(m_tmp);
5537                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5538                         /* m_tmp should now point to last one */
5539                         mp_last = m_tmp;
5540                         break;
5541                 }
5542         }
5543         /*
5544          * Place in the size, but we don't include the last pad (if any) in
5545          * the INIT-ACK.
5546          */
5547         initack->ch.chunk_length = htons(p_len);
5548
5549         /*
5550          * Time to sign the cookie, we don't sign over the cookie signature
5551          * though thus we set trailer.
5552          */
5553         (void)sctp_hmac_m(SCTP_HMAC,
5554             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5555             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5556             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5557         /*
5558          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5559          * here since the timer will drive a retranmission.
5560          */
5561         padval = p_len % 4;
5562         if ((padval) && (mp_last)) {
5563                 /* see my previous comments on mp_last */
5564                 int ret;
5565
5566                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5567                 if (ret) {
5568                         /* Houston we have a problem, no space */
5569                         sctp_m_freem(m);
5570                         return;
5571                 }
5572                 p_len += padval;
5573         }
5574         if (stc.loopback_scope) {
5575                 over_addr = &store1;
5576         } else {
5577                 over_addr = NULL;
5578         }
5579
5580         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5581             0, NULL, 0,
5582             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5583             port, SCTP_SO_NOT_LOCKED, over_addr);
5584         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5585 }
5586
5587
5588 void
5589 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5590     struct sctp_association *asoc,
5591     struct sctp_stream_out *strq, int holds_lock)
5592 {
5593         if (holds_lock == 0) {
5594                 SCTP_TCB_SEND_LOCK(stcb);
5595         }
5596         if ((strq->next_spoke.tqe_next == NULL) &&
5597             (strq->next_spoke.tqe_prev == NULL)) {
5598                 TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5599         }
5600         if (holds_lock == 0) {
5601                 SCTP_TCB_SEND_UNLOCK(stcb);
5602         }
5603 }
5604
5605 void
5606 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5607     struct sctp_association *asoc,
5608     struct sctp_stream_out *strq,
5609     int holds_lock)
5610 {
5611         /* take off and then setup so we know it is not on the wheel */
5612         if (holds_lock == 0) {
5613                 SCTP_TCB_SEND_LOCK(stcb);
5614         }
5615         if (TAILQ_EMPTY(&strq->outqueue)) {
5616                 if (asoc->last_out_stream == strq) {
5617                         asoc->last_out_stream = TAILQ_PREV(asoc->last_out_stream, sctpwheel_listhead, next_spoke);
5618                         if (asoc->last_out_stream == NULL) {
5619                                 asoc->last_out_stream = TAILQ_LAST(&asoc->out_wheel, sctpwheel_listhead);
5620                         }
5621                         if (asoc->last_out_stream == strq) {
5622                                 asoc->last_out_stream = NULL;
5623                         }
5624                 }
5625                 TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5626                 strq->next_spoke.tqe_next = NULL;
5627                 strq->next_spoke.tqe_prev = NULL;
5628         }
5629         if (holds_lock == 0) {
5630                 SCTP_TCB_SEND_UNLOCK(stcb);
5631         }
5632 }
5633
5634 static void
5635 sctp_prune_prsctp(struct sctp_tcb *stcb,
5636     struct sctp_association *asoc,
5637     struct sctp_sndrcvinfo *srcv,
5638     int dataout)
5639 {
5640         int freed_spc = 0;
5641         struct sctp_tmit_chunk *chk, *nchk;
5642
5643         SCTP_TCB_LOCK_ASSERT(stcb);
5644         if ((asoc->peer_supports_prsctp) &&
5645             (asoc->sent_queue_cnt_removeable > 0)) {
5646                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5647                         /*
5648                          * Look for chunks marked with the PR_SCTP flag AND
5649                          * the buffer space flag. If the one being sent is
5650                          * equal or greater priority then purge the old one
5651                          * and free some space.
5652                          */
5653                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5654                                 /*
5655                                  * This one is PR-SCTP AND buffer space
5656                                  * limited type
5657                                  */
5658                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5659                                         /*
5660                                          * Lower numbers equates to higher
5661                                          * priority so if the one we are
5662                                          * looking at has a larger or equal
5663                                          * priority we want to drop the data
5664                                          * and NOT retransmit it.
5665                                          */
5666                                         if (chk->data) {
5667                                                 /*
5668                                                  * We release the book_size
5669                                                  * if the mbuf is here
5670                                                  */
5671                                                 int ret_spc;
5672                                                 int cause;
5673
5674                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5675                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5676                                                 else
5677                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5678                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5679                                                     cause,
5680                                                     SCTP_SO_LOCKED);
5681                                                 freed_spc += ret_spc;
5682                                                 if (freed_spc >= dataout) {
5683                                                         return;
5684                                                 }
5685                                         }       /* if chunk was present */
5686                                 }       /* if of sufficent priority */
5687                         }       /* if chunk has enabled */
5688                 }               /* tailqforeach */
5689
5690                 chk = TAILQ_FIRST(&asoc->send_queue);
5691                 while (chk) {
5692                         nchk = TAILQ_NEXT(chk, sctp_next);
5693                         /* Here we must move to the sent queue and mark */
5694                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5695                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5696                                         if (chk->data) {
5697                                                 /*
5698                                                  * We release the book_size
5699                                                  * if the mbuf is here
5700                                                  */
5701                                                 int ret_spc;
5702
5703                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5704                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5705                                                     SCTP_SO_LOCKED);
5706
5707                                                 freed_spc += ret_spc;
5708                                                 if (freed_spc >= dataout) {
5709                                                         return;
5710                                                 }
5711                                         }       /* end if chk->data */
5712                                 }       /* end if right class */
5713                         }       /* end if chk pr-sctp */
5714                         chk = nchk;
5715                 }               /* end while (chk) */
5716         }                       /* if enabled in asoc */
5717 }
5718
5719 int
5720 sctp_get_frag_point(struct sctp_tcb *stcb,
5721     struct sctp_association *asoc)
5722 {
5723         int siz, ovh;
5724
5725         /*
5726          * For endpoints that have both v6 and v4 addresses we must reserve
5727          * room for the ipv6 header, for those that are only dealing with V4
5728          * we use a larger frag point.
5729          */
5730         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5731                 ovh = SCTP_MED_OVERHEAD;
5732         } else {
5733                 ovh = SCTP_MED_V4_OVERHEAD;
5734         }
5735
5736         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5737                 siz = asoc->smallest_mtu - ovh;
5738         else
5739                 siz = (stcb->asoc.sctp_frag_point - ovh);
5740         /*
5741          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5742          */
5743         /* A data chunk MUST fit in a cluster */
5744         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5745         /* } */
5746
5747         /* adjust for an AUTH chunk if DATA requires auth */
5748         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5749                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5750
5751         if (siz % 4) {
5752                 /* make it an even word boundary please */
5753                 siz -= (siz % 4);
5754         }
5755         return (siz);
5756 }
5757
5758 static void
5759 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5760 {
5761         sp->pr_sctp_on = 0;
5762         /*
5763          * We assume that the user wants PR_SCTP_TTL if the user provides a
5764          * positive lifetime but does not specify any PR_SCTP policy. This
5765          * is a BAD assumption and causes problems at least with the
5766          * U-Vancovers MPI folks. I will change this to be no policy means
5767          * NO PR-SCTP.
5768          */
5769         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5770                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5771                 sp->pr_sctp_on = 1;
5772         } else {
5773                 return;
5774         }
5775         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5776         case CHUNK_FLAGS_PR_SCTP_BUF:
5777                 /*
5778                  * Time to live is a priority stored in tv_sec when doing
5779                  * the buffer drop thing.
5780                  */
5781                 sp->ts.tv_sec = sp->timetolive;
5782                 sp->ts.tv_usec = 0;
5783                 break;
5784         case CHUNK_FLAGS_PR_SCTP_TTL:
5785                 {
5786                         struct timeval tv;
5787
5788                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5789                         tv.tv_sec = sp->timetolive / 1000;
5790                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5791                         /*
5792                          * TODO sctp_constants.h needs alternative time
5793                          * macros when _KERNEL is undefined.
5794                          */
5795                         timevaladd(&sp->ts, &tv);
5796                 }
5797                 break;
5798         case CHUNK_FLAGS_PR_SCTP_RTX:
5799                 /*
5800                  * Time to live is a the number or retransmissions stored in
5801                  * tv_sec.
5802                  */
5803                 sp->ts.tv_sec = sp->timetolive;
5804                 sp->ts.tv_usec = 0;
5805                 break;
5806         default:
5807                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5808                     "Unknown PR_SCTP policy %u.\n",
5809                     PR_SCTP_POLICY(sp->sinfo_flags));
5810                 break;
5811         }
5812 }
5813
5814 static int
5815 sctp_msg_append(struct sctp_tcb *stcb,
5816     struct sctp_nets *net,
5817     struct mbuf *m,
5818     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5819 {
5820         int error = 0, holds_lock;
5821         struct mbuf *at;
5822         struct sctp_stream_queue_pending *sp = NULL;
5823         struct sctp_stream_out *strm;
5824
5825         /*
5826          * Given an mbuf chain, put it into the association send queue and
5827          * place it on the wheel
5828          */
5829         holds_lock = hold_stcb_lock;
5830         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5831                 /* Invalid stream number */
5832                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5833                 error = EINVAL;
5834                 goto out_now;
5835         }
5836         if ((stcb->asoc.stream_locked) &&
5837             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5838                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5839                 error = EINVAL;
5840                 goto out_now;
5841         }
5842         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5843         /* Now can we send this? */
5844         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5845             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5846             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5847             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5848                 /* got data while shutting down */
5849                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5850                 error = ECONNRESET;
5851                 goto out_now;
5852         }
5853         sctp_alloc_a_strmoq(stcb, sp);
5854         if (sp == NULL) {
5855                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5856                 error = ENOMEM;
5857                 goto out_now;
5858         }
5859         sp->sinfo_flags = srcv->sinfo_flags;
5860         sp->timetolive = srcv->sinfo_timetolive;
5861         sp->ppid = srcv->sinfo_ppid;
5862         sp->context = srcv->sinfo_context;
5863         sp->strseq = 0;
5864         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5865                 sp->net = net;
5866         } else {
5867                 sp->net = stcb->asoc.primary_destination;
5868         }
5869         atomic_add_int(&sp->net->ref_count, 1);
5870         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5871         sp->stream = srcv->sinfo_stream;
5872         sp->msg_is_complete = 1;
5873         sp->sender_all_done = 1;
5874         sp->some_taken = 0;
5875         sp->data = m;
5876         sp->tail_mbuf = NULL;
5877         sp->length = 0;
5878         at = m;
5879         sctp_set_prsctp_policy(sp);
5880         /*
5881          * We could in theory (for sendall) sifa the length in, but we would
5882          * still have to hunt through the chain since we need to setup the
5883          * tail_mbuf
5884          */
5885         while (at) {
5886                 if (SCTP_BUF_NEXT(at) == NULL)
5887                         sp->tail_mbuf = at;
5888                 sp->length += SCTP_BUF_LEN(at);
5889                 at = SCTP_BUF_NEXT(at);
5890         }
5891         SCTP_TCB_SEND_LOCK(stcb);
5892         sctp_snd_sb_alloc(stcb, sp->length);
5893         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5894         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5895         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5896                 sp->strseq = strm->next_sequence_sent;
5897                 strm->next_sequence_sent++;
5898         }
5899         if ((strm->next_spoke.tqe_next == NULL) &&
5900             (strm->next_spoke.tqe_prev == NULL)) {
5901                 /* Not on wheel, insert */
5902                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5903         }
5904         m = NULL;
5905         SCTP_TCB_SEND_UNLOCK(stcb);
5906 out_now:
5907         if (m) {
5908                 sctp_m_freem(m);
5909         }
5910         return (error);
5911 }
5912
5913
5914 static struct mbuf *
5915 sctp_copy_mbufchain(struct mbuf *clonechain,
5916     struct mbuf *outchain,
5917     struct mbuf **endofchain,
5918     int can_take_mbuf,
5919     int sizeofcpy,
5920     uint8_t copy_by_ref)
5921 {
5922         struct mbuf *m;
5923         struct mbuf *appendchain;
5924         caddr_t cp;
5925         int len;
5926
5927         if (endofchain == NULL) {
5928                 /* error */
5929 error_out:
5930                 if (outchain)
5931                         sctp_m_freem(outchain);
5932                 return (NULL);
5933         }
5934         if (can_take_mbuf) {
5935                 appendchain = clonechain;
5936         } else {
5937                 if (!copy_by_ref &&
5938                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5939                     ) {
5940                         /* Its not in a cluster */
5941                         if (*endofchain == NULL) {
5942                                 /* lets get a mbuf cluster */
5943                                 if (outchain == NULL) {
5944                                         /* This is the general case */
5945                         new_mbuf:
5946                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5947                                         if (outchain == NULL) {
5948                                                 goto error_out;
5949                                         }
5950                                         SCTP_BUF_LEN(outchain) = 0;
5951                                         *endofchain = outchain;
5952                                         /* get the prepend space */
5953                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5954                                 } else {
5955                                         /*
5956                                          * We really should not get a NULL
5957                                          * in endofchain
5958                                          */
5959                                         /* find end */
5960                                         m = outchain;
5961                                         while (m) {
5962                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5963                                                         *endofchain = m;
5964                                                         break;
5965                                                 }
5966                                                 m = SCTP_BUF_NEXT(m);
5967                                         }
5968                                         /* sanity */
5969                                         if (*endofchain == NULL) {
5970                                                 /*
5971                                                  * huh, TSNH XXX maybe we
5972                                                  * should panic
5973                                                  */
5974                                                 sctp_m_freem(outchain);
5975                                                 goto new_mbuf;
5976                                         }
5977                                 }
5978                                 /* get the new end of length */
5979                                 len = M_TRAILINGSPACE(*endofchain);
5980                         } else {
5981                                 /* how much is left at the end? */
5982                                 len = M_TRAILINGSPACE(*endofchain);
5983                         }
5984                         /* Find the end of the data, for appending */
5985                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5986
5987                         /* Now lets copy it out */
5988                         if (len >= sizeofcpy) {
5989                                 /* It all fits, copy it in */
5990                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5991                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5992                         } else {
5993                                 /* fill up the end of the chain */
5994                                 if (len > 0) {
5995                                         m_copydata(clonechain, 0, len, cp);
5996                                         SCTP_BUF_LEN((*endofchain)) += len;
5997                                         /* now we need another one */
5998                                         sizeofcpy -= len;
5999                                 }
6000                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6001                                 if (m == NULL) {
6002                                         /* We failed */
6003                                         goto error_out;
6004                                 }
6005                                 SCTP_BUF_NEXT((*endofchain)) = m;
6006                                 *endofchain = m;
6007                                 cp = mtod((*endofchain), caddr_t);
6008                                 m_copydata(clonechain, len, sizeofcpy, cp);
6009                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6010                         }
6011                         return (outchain);
6012                 } else {
6013                         /* copy the old fashion way */
6014                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6015 #ifdef SCTP_MBUF_LOGGING
6016                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6017                                 struct mbuf *mat;
6018
6019                                 mat = appendchain;
6020                                 while (mat) {
6021                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6022                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6023                                         }
6024                                         mat = SCTP_BUF_NEXT(mat);
6025                                 }
6026                         }
6027 #endif
6028                 }
6029         }
6030         if (appendchain == NULL) {
6031                 /* error */
6032                 if (outchain)
6033                         sctp_m_freem(outchain);
6034                 return (NULL);
6035         }
6036         if (outchain) {
6037                 /* tack on to the end */
6038                 if (*endofchain != NULL) {
6039                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6040                 } else {
6041                         m = outchain;
6042                         while (m) {
6043                                 if (SCTP_BUF_NEXT(m) == NULL) {
6044                                         SCTP_BUF_NEXT(m) = appendchain;
6045                                         break;
6046                                 }
6047                                 m = SCTP_BUF_NEXT(m);
6048                         }
6049                 }
6050                 /*
6051                  * save off the end and update the end-chain postion
6052                  */
6053                 m = appendchain;
6054                 while (m) {
6055                         if (SCTP_BUF_NEXT(m) == NULL) {
6056                                 *endofchain = m;
6057                                 break;
6058                         }
6059                         m = SCTP_BUF_NEXT(m);
6060                 }
6061                 return (outchain);
6062         } else {
6063                 /* save off the end and update the end-chain postion */
6064                 m = appendchain;
6065                 while (m) {
6066                         if (SCTP_BUF_NEXT(m) == NULL) {
6067                                 *endofchain = m;
6068                                 break;
6069                         }
6070                         m = SCTP_BUF_NEXT(m);
6071                 }
6072                 return (appendchain);
6073         }
6074 }
6075
6076 int
6077 sctp_med_chunk_output(struct sctp_inpcb *inp,
6078     struct sctp_tcb *stcb,
6079     struct sctp_association *asoc,
6080     int *num_out,
6081     int *reason_code,
6082     int control_only, int from_where,
6083     struct timeval *now, int *now_filled, int frag_point, int so_locked
6084 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6085     SCTP_UNUSED
6086 #endif
6087 );
6088
6089 static void
6090 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6091     uint32_t val)
6092 {
6093         struct sctp_copy_all *ca;
6094         struct mbuf *m;
6095         int ret = 0;
6096         int added_control = 0;
6097         int un_sent, do_chunk_output = 1;
6098         struct sctp_association *asoc;
6099
6100         ca = (struct sctp_copy_all *)ptr;
6101         if (ca->m == NULL) {
6102                 return;
6103         }
6104         if (ca->inp != inp) {
6105                 /* TSNH */
6106                 return;
6107         }
6108         if ((ca->m) && ca->sndlen) {
6109                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6110                 if (m == NULL) {
6111                         /* can't copy so we are done */
6112                         ca->cnt_failed++;
6113                         return;
6114                 }
6115 #ifdef SCTP_MBUF_LOGGING
6116                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6117                         struct mbuf *mat;
6118
6119                         mat = m;
6120                         while (mat) {
6121                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6122                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6123                                 }
6124                                 mat = SCTP_BUF_NEXT(mat);
6125                         }
6126                 }
6127 #endif
6128         } else {
6129                 m = NULL;
6130         }
6131         SCTP_TCB_LOCK_ASSERT(stcb);
6132         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6133                 /* Abort this assoc with m as the user defined reason */
6134                 if (m) {
6135                         struct sctp_paramhdr *ph;
6136
6137                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6138                         if (m) {
6139                                 ph = mtod(m, struct sctp_paramhdr *);
6140                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6141                                 ph->param_length = htons(ca->sndlen);
6142                         }
6143                         /*
6144                          * We add one here to keep the assoc from
6145                          * dis-appearing on us.
6146                          */
6147                         atomic_add_int(&stcb->asoc.refcnt, 1);
6148                         sctp_abort_an_association(inp, stcb,
6149                             SCTP_RESPONSE_TO_USER_REQ,
6150                             m, SCTP_SO_NOT_LOCKED);
6151                         /*
6152                          * sctp_abort_an_association calls sctp_free_asoc()
6153                          * free association will NOT free it since we
6154                          * incremented the refcnt .. we do this to prevent
6155                          * it being freed and things getting tricky since we
6156                          * could end up (from free_asoc) calling inpcb_free
6157                          * which would get a recursive lock call to the
6158                          * iterator lock.. But as a consequence of that the
6159                          * stcb will return to us un-locked.. since
6160                          * free_asoc returns with either no TCB or the TCB
6161                          * unlocked, we must relock.. to unlock in the
6162                          * iterator timer :-0
6163                          */
6164                         SCTP_TCB_LOCK(stcb);
6165                         atomic_add_int(&stcb->asoc.refcnt, -1);
6166                         goto no_chunk_output;
6167                 }
6168         } else {
6169                 if (m) {
6170                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6171                             &ca->sndrcv, 1);
6172                 }
6173                 asoc = &stcb->asoc;
6174                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6175                         /* shutdown this assoc */
6176                         int cnt;
6177
6178                         cnt = sctp_is_there_unsent_data(stcb);
6179
6180                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6181                             TAILQ_EMPTY(&asoc->sent_queue) &&
6182                             (cnt == 0)) {
6183                                 if (asoc->locked_on_sending) {
6184                                         goto abort_anyway;
6185                                 }
6186                                 /*
6187                                  * there is nothing queued to send, so I'm
6188                                  * done...
6189                                  */
6190                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6191                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6192                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6193                                         /*
6194                                          * only send SHUTDOWN the first time
6195                                          * through
6196                                          */
6197                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6198                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6199                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6200                                         }
6201                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6202                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6203                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6204                                             asoc->primary_destination);
6205                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6206                                             asoc->primary_destination);
6207                                         added_control = 1;
6208                                         do_chunk_output = 0;
6209                                 }
6210                         } else {
6211                                 /*
6212                                  * we still got (or just got) data to send,
6213                                  * so set SHUTDOWN_PENDING
6214                                  */
6215                                 /*
6216                                  * XXX sockets draft says that SCTP_EOF
6217                                  * should be sent with no data.  currently,
6218                                  * we will allow user data to be sent first
6219                                  * and move to SHUTDOWN-PENDING
6220                                  */
6221                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6222                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6223                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6224                                         if (asoc->locked_on_sending) {
6225                                                 /*
6226                                                  * Locked to send out the
6227                                                  * data
6228                                                  */
6229                                                 struct sctp_stream_queue_pending *sp;
6230
6231                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6232                                                 if (sp) {
6233                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6234                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6235                                                 }
6236                                         }
6237                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6238                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6239                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6240                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6241                                 abort_anyway:
6242                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6243                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6244                                                     SCTP_RESPONSE_TO_USER_REQ,
6245                                                     NULL, SCTP_SO_NOT_LOCKED);
6246                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6247                                                 goto no_chunk_output;
6248                                         }
6249                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6250                                             asoc->primary_destination);
6251                                 }
6252                         }
6253
6254                 }
6255         }
6256         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6257             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6258
6259         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6260             (stcb->asoc.total_flight > 0) &&
6261             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6262             ) {
6263                 do_chunk_output = 0;
6264         }
6265         if (do_chunk_output)
6266                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6267         else if (added_control) {
6268                 int num_out = 0, reason = 0, now_filled = 0;
6269                 struct timeval now;
6270                 int frag_point;
6271
6272                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6273                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6274                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6275         }
6276 no_chunk_output:
6277         if (ret) {
6278                 ca->cnt_failed++;
6279         } else {
6280                 ca->cnt_sent++;
6281         }
6282 }
6283
6284 static void
6285 sctp_sendall_completes(void *ptr, uint32_t val)
6286 {
6287         struct sctp_copy_all *ca;
6288
6289         ca = (struct sctp_copy_all *)ptr;
6290         /*
6291          * Do a notify here? Kacheong suggests that the notify be done at
6292          * the send time.. so you would push up a notification if any send
6293          * failed. Don't know if this is feasable since the only failures we
6294          * have is "memory" related and if you cannot get an mbuf to send
6295          * the data you surely can't get an mbuf to send up to notify the
6296          * user you can't send the data :->
6297          */
6298
6299         /* now free everything */
6300         sctp_m_freem(ca->m);
6301         SCTP_FREE(ca, SCTP_M_COPYAL);
6302 }
6303
6304
6305 #define MC_ALIGN(m, len) do {                                           \
6306         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6307 } while (0)
6308
6309
6310
6311 static struct mbuf *
6312 sctp_copy_out_all(struct uio *uio, int len)
6313 {
6314         struct mbuf *ret, *at;
6315         int left, willcpy, cancpy, error;
6316
6317         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6318         if (ret == NULL) {
6319                 /* TSNH */
6320                 return (NULL);
6321         }
6322         left = len;
6323         SCTP_BUF_LEN(ret) = 0;
6324         /* save space for the data chunk header */
6325         cancpy = M_TRAILINGSPACE(ret);
6326         willcpy = min(cancpy, left);
6327         at = ret;
6328         while (left > 0) {
6329                 /* Align data to the end */
6330                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6331                 if (error) {
6332         err_out_now:
6333                         sctp_m_freem(at);
6334                         return (NULL);
6335                 }
6336                 SCTP_BUF_LEN(at) = willcpy;
6337                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6338                 left -= willcpy;
6339                 if (left > 0) {
6340                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6341                         if (SCTP_BUF_NEXT(at) == NULL) {
6342                                 goto err_out_now;
6343                         }
6344                         at = SCTP_BUF_NEXT(at);
6345                         SCTP_BUF_LEN(at) = 0;
6346                         cancpy = M_TRAILINGSPACE(at);
6347                         willcpy = min(cancpy, left);
6348                 }
6349         }
6350         return (ret);
6351 }
6352
6353 static int
6354 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6355     struct sctp_sndrcvinfo *srcv)
6356 {
6357         int ret;
6358         struct sctp_copy_all *ca;
6359
6360         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6361             SCTP_M_COPYAL);
6362         if (ca == NULL) {
6363                 sctp_m_freem(m);
6364                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6365                 return (ENOMEM);
6366         }
6367         memset(ca, 0, sizeof(struct sctp_copy_all));
6368
6369         ca->inp = inp;
6370         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6371         /*
6372          * take off the sendall flag, it would be bad if we failed to do
6373          * this :-0
6374          */
6375         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6376         /* get length and mbuf chain */
6377         if (uio) {
6378                 ca->sndlen = uio->uio_resid;
6379                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6380                 if (ca->m == NULL) {
6381                         SCTP_FREE(ca, SCTP_M_COPYAL);
6382                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6383                         return (ENOMEM);
6384                 }
6385         } else {
6386                 /* Gather the length of the send */
6387                 struct mbuf *mat;
6388
6389                 mat = m;
6390                 ca->sndlen = 0;
6391                 while (m) {
6392                         ca->sndlen += SCTP_BUF_LEN(m);
6393                         m = SCTP_BUF_NEXT(m);
6394                 }
6395                 ca->m = mat;
6396         }
6397         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6398             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6399             SCTP_ASOC_ANY_STATE,
6400             (void *)ca, 0,
6401             sctp_sendall_completes, inp, 1);
6402         if (ret) {
6403                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6404                 SCTP_FREE(ca, SCTP_M_COPYAL);
6405                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6406                 return (EFAULT);
6407         }
6408         return (0);
6409 }
6410
6411
6412 void
6413 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6414 {
6415         struct sctp_tmit_chunk *chk, *nchk;
6416
6417         chk = TAILQ_FIRST(&asoc->control_send_queue);
6418         while (chk) {
6419                 nchk = TAILQ_NEXT(chk, sctp_next);
6420                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6421                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6422                         if (chk->data) {
6423                                 sctp_m_freem(chk->data);
6424                                 chk->data = NULL;
6425                         }
6426                         asoc->ctrl_queue_cnt--;
6427                         sctp_free_a_chunk(stcb, chk);
6428                 }
6429                 chk = nchk;
6430         }
6431 }
6432
6433 void
6434 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6435 {
6436         struct sctp_association *asoc;
6437         struct sctp_tmit_chunk *chk, *chk_tmp;
6438         struct sctp_asconf_chunk *acp;
6439
6440         asoc = &stcb->asoc;
6441         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6442             chk = chk_tmp) {
6443                 /* get next chk */
6444                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6445                 /* find SCTP_ASCONF chunk in queue */
6446                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6447                         if (chk->data) {
6448                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6449                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6450                                         /* Not Acked yet */
6451                                         break;
6452                                 }
6453                         }
6454                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6455                         if (chk->data) {
6456                                 sctp_m_freem(chk->data);
6457                                 chk->data = NULL;
6458                         }
6459                         asoc->ctrl_queue_cnt--;
6460                         sctp_free_a_chunk(stcb, chk);
6461                 }
6462         }
6463 }
6464
6465
6466 static void
6467 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6468
6469     struct sctp_association *asoc,
6470     struct sctp_tmit_chunk **data_list,
6471     int bundle_at,
6472     struct sctp_nets *net)
6473 {
6474         int i;
6475         struct sctp_tmit_chunk *tp1;
6476
6477         for (i = 0; i < bundle_at; i++) {
6478                 /* off of the send queue */
6479                 if (i) {
6480                         /*
6481                          * Any chunk NOT 0 you zap the time chunk 0 gets
6482                          * zapped or set based on if a RTO measurment is
6483                          * needed.
6484                          */
6485                         data_list[i]->do_rtt = 0;
6486                 }
6487                 /* record time */
6488                 data_list[i]->sent_rcv_time = net->last_sent_time;
6489                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6490                 TAILQ_REMOVE(&asoc->send_queue,
6491                     data_list[i],
6492                     sctp_next);
6493                 /* on to the sent queue */
6494                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6495                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6496                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6497                         struct sctp_tmit_chunk *tpp;
6498
6499                         /* need to move back */
6500         back_up_more:
6501                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6502                         if (tpp == NULL) {
6503                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6504                                 goto all_done;
6505                         }
6506                         tp1 = tpp;
6507                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6508                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6509                                 goto back_up_more;
6510                         }
6511                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6512                 } else {
6513                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6514                             data_list[i],
6515                             sctp_next);
6516                 }
6517 all_done:
6518                 /* This does not lower until the cum-ack passes it */
6519                 asoc->sent_queue_cnt++;
6520                 asoc->send_queue_cnt--;
6521                 if ((asoc->peers_rwnd <= 0) &&
6522                     (asoc->total_flight == 0) &&
6523                     (bundle_at == 1)) {
6524                         /* Mark the chunk as being a window probe */
6525                         SCTP_STAT_INCR(sctps_windowprobed);
6526                 }
6527 #ifdef SCTP_AUDITING_ENABLED
6528                 sctp_audit_log(0xC2, 3);
6529 #endif
6530                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6531                 data_list[i]->snd_count = 1;
6532                 data_list[i]->rec.data.chunk_was_revoked = 0;
6533                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6534                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6535                             data_list[i]->whoTo->flight_size,
6536                             data_list[i]->book_size,
6537                             (uintptr_t) data_list[i]->whoTo,
6538                             data_list[i]->rec.data.TSN_seq);
6539                 }
6540                 sctp_flight_size_increase(data_list[i]);
6541                 sctp_total_flight_increase(stcb, data_list[i]);
6542                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6543                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6544                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6545                 }
6546                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6547                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6548                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6549                         /* SWS sender side engages */
6550                         asoc->peers_rwnd = 0;
6551                 }
6552         }
6553 }
6554
6555 static void
6556 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6557 {
6558         struct sctp_tmit_chunk *chk, *nchk;
6559
6560         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6561             chk; chk = nchk) {
6562                 nchk = TAILQ_NEXT(chk, sctp_next);
6563                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6564                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6565                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6566                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6567                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6568                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6569                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6570                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6571                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6572                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6573                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6574                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6575                         /* Stray chunks must be cleaned up */
6576         clean_up_anyway:
6577                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6578                         if (chk->data) {
6579                                 sctp_m_freem(chk->data);
6580                                 chk->data = NULL;
6581                         }
6582                         asoc->ctrl_queue_cnt--;
6583                         sctp_free_a_chunk(stcb, chk);
6584                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6585                         /* special handling, we must look into the param */
6586                         if (chk != asoc->str_reset) {
6587                                 goto clean_up_anyway;
6588                         }
6589                 }
6590         }
6591 }
6592
6593
6594 static int
6595 sctp_can_we_split_this(struct sctp_tcb *stcb,
6596     uint32_t length,
6597     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6598 {
6599         /*
6600          * Make a decision on if I should split a msg into multiple parts.
6601          * This is only asked of incomplete messages.
6602          */
6603         if (eeor_on) {
6604                 /*
6605                  * If we are doing EEOR we need to always send it if its the
6606                  * entire thing, since it might be all the guy is putting in
6607                  * the hopper.
6608                  */
6609                 if (goal_mtu >= length) {
6610                         /*-
6611                          * If we have data outstanding,
6612                          * we get another chance when the sack
6613                          * arrives to transmit - wait for more data
6614                          */
6615                         if (stcb->asoc.total_flight == 0) {
6616                                 /*
6617                                  * If nothing is in flight, we zero the
6618                                  * packet counter.
6619                                  */
6620                                 return (length);
6621                         }
6622                         return (0);
6623
6624                 } else {
6625                         /* You can fill the rest */
6626                         return (goal_mtu);
6627                 }
6628         }
6629         /*-
6630          * For those strange folk that make the send buffer
6631          * smaller than our fragmentation point, we can't
6632          * get a full msg in so we have to allow splitting.
6633          */
6634         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6635                 return (length);
6636         }
6637         if ((length <= goal_mtu) ||
6638             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6639                 /* Sub-optimial residual don't split in non-eeor mode. */
6640                 return (0);
6641         }
6642         /*
6643          * If we reach here length is larger than the goal_mtu. Do we wish
6644          * to split it for the sake of packet putting together?
6645          */
6646         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6647                 /* Its ok to split it */
6648                 return (min(goal_mtu, frag_point));
6649         }
6650         /* Nope, can't split */
6651         return (0);
6652
6653 }
6654
6655 static uint32_t
6656 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6657     struct sctp_stream_out *strq,
6658     uint32_t goal_mtu,
6659     uint32_t frag_point,
6660     int *locked,
6661     int *giveup,
6662     int eeor_mode,
6663     int *bail)
6664 {
6665         /* Move from the stream to the send_queue keeping track of the total */
6666         struct sctp_association *asoc;
6667         struct sctp_stream_queue_pending *sp;
6668         struct sctp_tmit_chunk *chk;
6669         struct sctp_data_chunk *dchkh;
6670         uint32_t to_move, length;
6671         uint8_t rcv_flags = 0;
6672         uint8_t some_taken;
6673         uint8_t send_lock_up = 0;
6674
6675         SCTP_TCB_LOCK_ASSERT(stcb);
6676         asoc = &stcb->asoc;
6677 one_more_time:
6678         /* sa_ignore FREED_MEMORY */
6679         sp = TAILQ_FIRST(&strq->outqueue);
6680         if (sp == NULL) {
6681                 *locked = 0;
6682                 if (send_lock_up == 0) {
6683                         SCTP_TCB_SEND_LOCK(stcb);
6684                         send_lock_up = 1;
6685                 }
6686                 sp = TAILQ_FIRST(&strq->outqueue);
6687                 if (sp) {
6688                         goto one_more_time;
6689                 }
6690                 if (strq->last_msg_incomplete) {
6691                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6692                             strq->stream_no,
6693                             strq->last_msg_incomplete);
6694                         strq->last_msg_incomplete = 0;
6695                 }
6696                 to_move = 0;
6697                 if (send_lock_up) {
6698                         SCTP_TCB_SEND_UNLOCK(stcb);
6699                         send_lock_up = 0;
6700                 }
6701                 goto out_of;
6702         }
6703         if ((sp->msg_is_complete) && (sp->length == 0)) {
6704                 if (sp->sender_all_done) {
6705                         /*
6706                          * We are doing differed cleanup. Last time through
6707                          * when we took all the data the sender_all_done was
6708                          * not set.
6709                          */
6710                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6711                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6712                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6713                                     sp->sender_all_done,
6714                                     sp->length,
6715                                     sp->msg_is_complete,
6716                                     sp->put_last_out,
6717                                     send_lock_up);
6718                         }
6719                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6720                                 SCTP_TCB_SEND_LOCK(stcb);
6721                                 send_lock_up = 1;
6722                         }
6723                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6724                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6725                         sctp_free_remote_addr(sp->net);
6726                         if (sp->data) {
6727                                 sctp_m_freem(sp->data);
6728                                 sp->data = NULL;
6729                         }
6730                         sctp_free_a_strmoq(stcb, sp);
6731                         /* we can't be locked to it */
6732                         *locked = 0;
6733                         stcb->asoc.locked_on_sending = NULL;
6734                         if (send_lock_up) {
6735                                 SCTP_TCB_SEND_UNLOCK(stcb);
6736                                 send_lock_up = 0;
6737                         }
6738                         /* back to get the next msg */
6739                         goto one_more_time;
6740                 } else {
6741                         /*
6742                          * sender just finished this but still holds a
6743                          * reference
6744                          */
6745                         *locked = 1;
6746                         *giveup = 1;
6747                         to_move = 0;
6748                         goto out_of;
6749                 }
6750         } else {
6751                 /* is there some to get */
6752                 if (sp->length == 0) {
6753                         /* no */
6754                         *locked = 1;
6755                         *giveup = 1;
6756                         to_move = 0;
6757                         goto out_of;
6758                 } else if (sp->discard_rest) {
6759                         if (send_lock_up == 0) {
6760                                 SCTP_TCB_SEND_LOCK(stcb);
6761                                 send_lock_up = 1;
6762                         }
6763                         /* Whack down the size */
6764                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6765                         if ((stcb->sctp_socket != NULL) && \
6766                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6767                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6768                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6769                         }
6770                         if (sp->data) {
6771                                 sctp_m_freem(sp->data);
6772                                 sp->data = NULL;
6773                                 sp->tail_mbuf = NULL;
6774                         }
6775                         sp->length = 0;
6776                         sp->some_taken = 1;
6777                         *locked = 1;
6778                         *giveup = 1;
6779                         to_move = 0;
6780                         goto out_of;
6781                 }
6782         }
6783         some_taken = sp->some_taken;
6784         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6785                 sp->msg_is_complete = 1;
6786         }
6787 re_look:
6788         length = sp->length;
6789         if (sp->msg_is_complete) {
6790                 /* The message is complete */
6791                 to_move = min(length, frag_point);
6792                 if (to_move == length) {
6793                         /* All of it fits in the MTU */
6794                         if (sp->some_taken) {
6795                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6796                                 sp->put_last_out = 1;
6797                         } else {
6798                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6799                                 sp->put_last_out = 1;
6800                         }
6801                 } else {
6802                         /* Not all of it fits, we fragment */
6803                         if (sp->some_taken == 0) {
6804                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6805                         }
6806                         sp->some_taken = 1;
6807                 }
6808         } else {
6809                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6810                 if (to_move) {
6811                         /*-
6812                          * We use a snapshot of length in case it
6813                          * is expanding during the compare.
6814                          */
6815                         uint32_t llen;
6816
6817                         llen = length;
6818                         if (to_move >= llen) {
6819                                 to_move = llen;
6820                                 if (send_lock_up == 0) {
6821                                         /*-
6822                                          * We are taking all of an incomplete msg
6823                                          * thus we need a send lock.
6824                                          */
6825                                         SCTP_TCB_SEND_LOCK(stcb);
6826                                         send_lock_up = 1;
6827                                         if (sp->msg_is_complete) {
6828                                                 /*
6829                                                  * the sender finished the
6830                                                  * msg
6831                                                  */
6832                                                 goto re_look;
6833                                         }
6834                                 }
6835                         }
6836                         if (sp->some_taken == 0) {
6837                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6838                                 sp->some_taken = 1;
6839                         }
6840                 } else {
6841                         /* Nothing to take. */
6842                         if (sp->some_taken) {
6843                                 *locked = 1;
6844                         }
6845                         *giveup = 1;
6846                         to_move = 0;
6847                         goto out_of;
6848                 }
6849         }
6850
6851         /* If we reach here, we can copy out a chunk */
6852         sctp_alloc_a_chunk(stcb, chk);
6853         if (chk == NULL) {
6854                 /* No chunk memory */
6855                 *giveup = 1;
6856                 to_move = 0;
6857                 goto out_of;
6858         }
6859         /*
6860          * Setup for unordered if needed by looking at the user sent info
6861          * flags.
6862          */
6863         if (sp->sinfo_flags & SCTP_UNORDERED) {
6864                 rcv_flags |= SCTP_DATA_UNORDERED;
6865         }
6866         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6867             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6868                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6869         }
6870         /* clear out the chunk before setting up */
6871         memset(chk, 0, sizeof(*chk));
6872         chk->rec.data.rcv_flags = rcv_flags;
6873
6874         if (to_move >= length) {
6875                 /* we think we can steal the whole thing */
6876                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6877                         SCTP_TCB_SEND_LOCK(stcb);
6878                         send_lock_up = 1;
6879                 }
6880                 if (to_move < sp->length) {
6881                         /* bail, it changed */
6882                         goto dont_do_it;
6883                 }
6884                 chk->data = sp->data;
6885                 chk->last_mbuf = sp->tail_mbuf;
6886                 /* register the stealing */
6887                 sp->data = sp->tail_mbuf = NULL;
6888         } else {
6889                 struct mbuf *m;
6890
6891 dont_do_it:
6892                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6893                 chk->last_mbuf = NULL;
6894                 if (chk->data == NULL) {
6895                         sp->some_taken = some_taken;
6896                         sctp_free_a_chunk(stcb, chk);
6897                         *bail = 1;
6898                         to_move = 0;
6899                         goto out_of;
6900                 }
6901 #ifdef SCTP_MBUF_LOGGING
6902                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6903                         struct mbuf *mat;
6904
6905                         mat = chk->data;
6906                         while (mat) {
6907                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6908                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6909                                 }
6910                                 mat = SCTP_BUF_NEXT(mat);
6911                         }
6912                 }
6913 #endif
6914                 /* Pull off the data */
6915                 m_adj(sp->data, to_move);
6916                 /* Now lets work our way down and compact it */
6917                 m = sp->data;
6918                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6919                         sp->data = SCTP_BUF_NEXT(m);
6920                         SCTP_BUF_NEXT(m) = NULL;
6921                         if (sp->tail_mbuf == m) {
6922                                 /*-
6923                                  * Freeing tail? TSNH since
6924                                  * we supposedly were taking less
6925                                  * than the sp->length.
6926                                  */
6927 #ifdef INVARIANTS
6928                                 panic("Huh, freing tail? - TSNH");
6929 #else
6930                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6931                                 sp->tail_mbuf = sp->data = NULL;
6932                                 sp->length = 0;
6933 #endif
6934
6935                         }
6936                         sctp_m_free(m);
6937                         m = sp->data;
6938                 }
6939         }
6940         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6941                 chk->copy_by_ref = 1;
6942         } else {
6943                 chk->copy_by_ref = 0;
6944         }
6945         /*
6946          * get last_mbuf and counts of mb useage This is ugly but hopefully
6947          * its only one mbuf.
6948          */
6949         if (chk->last_mbuf == NULL) {
6950                 chk->last_mbuf = chk->data;
6951                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6952                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6953                 }
6954         }
6955         if (to_move > length) {
6956                 /*- This should not happen either
6957                  * since we always lower to_move to the size
6958                  * of sp->length if its larger.
6959                  */
6960 #ifdef INVARIANTS
6961                 panic("Huh, how can to_move be larger?");
6962 #else
6963                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6964                 sp->length = 0;
6965 #endif
6966         } else {
6967                 atomic_subtract_int(&sp->length, to_move);
6968         }
6969         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6970                 /* Not enough room for a chunk header, get some */
6971                 struct mbuf *m;
6972
6973                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6974                 if (m == NULL) {
6975                         /*
6976                          * we're in trouble here. _PREPEND below will free
6977                          * all the data if there is no leading space, so we
6978                          * must put the data back and restore.
6979                          */
6980                         if (send_lock_up == 0) {
6981                                 SCTP_TCB_SEND_LOCK(stcb);
6982                                 send_lock_up = 1;
6983                         }
6984                         if (chk->data == NULL) {
6985                                 /* unsteal the data */
6986                                 sp->data = chk->data;
6987                                 sp->tail_mbuf = chk->last_mbuf;
6988                         } else {
6989                                 struct mbuf *m_tmp;
6990
6991                                 /* reassemble the data */
6992                                 m_tmp = sp->data;
6993                                 sp->data = chk->data;
6994                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6995                         }
6996                         sp->some_taken = some_taken;
6997                         atomic_add_int(&sp->length, to_move);
6998                         chk->data = NULL;
6999                         *bail = 1;
7000                         sctp_free_a_chunk(stcb, chk);
7001                         to_move = 0;
7002                         goto out_of;
7003                 } else {
7004                         SCTP_BUF_LEN(m) = 0;
7005                         SCTP_BUF_NEXT(m) = chk->data;
7006                         chk->data = m;
7007                         M_ALIGN(chk->data, 4);
7008                 }
7009         }
7010         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7011         if (chk->data == NULL) {
7012                 /* HELP, TSNH since we assured it would not above? */
7013 #ifdef INVARIANTS
7014                 panic("prepend failes HELP?");
7015 #else
7016                 SCTP_PRINTF("prepend fails HELP?\n");
7017                 sctp_free_a_chunk(stcb, chk);
7018 #endif
7019                 *bail = 1;
7020                 to_move = 0;
7021                 goto out_of;
7022         }
7023         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7024         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7025         chk->book_size_scale = 0;
7026         chk->sent = SCTP_DATAGRAM_UNSENT;
7027
7028         chk->flags = 0;
7029         chk->asoc = &stcb->asoc;
7030         chk->pad_inplace = 0;
7031         chk->no_fr_allowed = 0;
7032         chk->rec.data.stream_seq = sp->strseq;
7033         chk->rec.data.stream_number = sp->stream;
7034         chk->rec.data.payloadtype = sp->ppid;
7035         chk->rec.data.context = sp->context;
7036         chk->rec.data.doing_fast_retransmit = 0;
7037         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7038
7039         chk->rec.data.timetodrop = sp->ts;
7040         chk->flags = sp->act_flags;
7041
7042         chk->whoTo = net;
7043         atomic_add_int(&chk->whoTo->ref_count, 1);
7044
7045         if (sp->holds_key_ref) {
7046                 chk->auth_keyid = sp->auth_keyid;
7047                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7048                 chk->holds_key_ref = 1;
7049         }
7050         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7051         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7052                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7053                     (uintptr_t) stcb, sp->length,
7054                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7055                     chk->rec.data.TSN_seq);
7056         }
7057         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7058         /*
7059          * Put the rest of the things in place now. Size was done earlier in
7060          * previous loop prior to padding.
7061          */
7062
7063 #ifdef SCTP_ASOCLOG_OF_TSNS
7064         SCTP_TCB_LOCK_ASSERT(stcb);
7065         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7066                 asoc->tsn_out_at = 0;
7067                 asoc->tsn_out_wrapped = 1;
7068         }
7069         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7070         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7071         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7072         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7073         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7074         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7075         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7076         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7077         asoc->tsn_out_at++;
7078 #endif
7079
7080         dchkh->ch.chunk_type = SCTP_DATA;
7081         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7082         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7083         dchkh->dp.stream_id = htons(strq->stream_no);
7084         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7085         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7086         dchkh->ch.chunk_length = htons(chk->send_size);
7087         /* Now advance the chk->send_size by the actual pad needed. */
7088         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7089                 /* need a pad */
7090                 struct mbuf *lm;
7091                 int pads;
7092
7093                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7094                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7095                         chk->pad_inplace = 1;
7096                 }
7097                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7098                         /* pad added an mbuf */
7099                         chk->last_mbuf = lm;
7100                 }
7101                 chk->send_size += pads;
7102         }
7103         /* We only re-set the policy if it is on */
7104         if (sp->pr_sctp_on) {
7105                 sctp_set_prsctp_policy(sp);
7106                 asoc->pr_sctp_cnt++;
7107                 chk->pr_sctp_on = 1;
7108         } else {
7109                 chk->pr_sctp_on = 0;
7110         }
7111         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7112                 /* All done pull and kill the message */
7113                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7114                 if (sp->put_last_out == 0) {
7115                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7116                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7117                             sp->sender_all_done,
7118                             sp->length,
7119                             sp->msg_is_complete,
7120                             sp->put_last_out,
7121                             send_lock_up);
7122                 }
7123                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7124                         SCTP_TCB_SEND_LOCK(stcb);
7125                         send_lock_up = 1;
7126                 }
7127                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7128                 sctp_free_remote_addr(sp->net);
7129                 if (sp->data) {
7130                         sctp_m_freem(sp->data);
7131                         sp->data = NULL;
7132                 }
7133                 sctp_free_a_strmoq(stcb, sp);
7134
7135                 /* we can't be locked to it */
7136                 *locked = 0;
7137                 stcb->asoc.locked_on_sending = NULL;
7138         } else {
7139                 /* more to go, we are locked */
7140                 *locked = 1;
7141         }
7142         asoc->chunks_on_out_queue++;
7143         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7144         asoc->send_queue_cnt++;
7145 out_of:
7146         if (send_lock_up) {
7147                 SCTP_TCB_SEND_UNLOCK(stcb);
7148                 send_lock_up = 0;
7149         }
7150         return (to_move);
7151 }
7152
7153
7154 static struct sctp_stream_out *
7155 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7156 {
7157         struct sctp_stream_out *strq;
7158
7159         /* Find the next stream to use */
7160         if (asoc->last_out_stream == NULL) {
7161                 strq = TAILQ_FIRST(&asoc->out_wheel);
7162         } else {
7163                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7164                 if (strq == NULL) {
7165                         strq = TAILQ_FIRST(&asoc->out_wheel);
7166                 }
7167         }
7168         return (strq);
7169 }
7170
7171
7172 static void
7173 sctp_fill_outqueue(struct sctp_tcb *stcb,
7174     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7175 {
7176         struct sctp_association *asoc;
7177         struct sctp_stream_out *strq, *strqn;
7178         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7179         int locked, giveup;
7180         struct sctp_stream_queue_pending *sp;
7181
7182         SCTP_TCB_LOCK_ASSERT(stcb);
7183         asoc = &stcb->asoc;
7184 #ifdef INET6
7185         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7186                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7187         } else {
7188                 /* ?? not sure what else to do */
7189                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7190         }
7191 #else
7192         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7193 #endif
7194         /* Need an allowance for the data chunk header too */
7195         goal_mtu -= sizeof(struct sctp_data_chunk);
7196
7197         /* must make even word boundary */
7198         goal_mtu &= 0xfffffffc;
7199         if (asoc->locked_on_sending) {
7200                 /* We are stuck on one stream until the message completes. */
7201                 strqn = strq = asoc->locked_on_sending;
7202                 locked = 1;
7203         } else {
7204                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7205                 locked = 0;
7206         }
7207
7208         while ((goal_mtu > 0) && strq) {
7209                 sp = TAILQ_FIRST(&strq->outqueue);
7210                 /*
7211                  * If CMT is off, we must validate that the stream in
7212                  * question has the first item pointed towards are network
7213                  * destionation requested by the caller. Note that if we
7214                  * turn out to be locked to a stream (assigning TSN's then
7215                  * we must stop, since we cannot look for another stream
7216                  * with data to send to that destination). In CMT's case, by
7217                  * skipping this check, we will send one data packet towards
7218                  * the requested net.
7219                  */
7220                 if (sp == NULL) {
7221                         break;
7222                 }
7223                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7224                         /* none for this network */
7225                         if (locked) {
7226                                 break;
7227                         } else {
7228                                 strq = sctp_select_a_stream(stcb, asoc);
7229                                 if (strq == NULL)
7230                                         /* none left */
7231                                         break;
7232                                 if (strqn == strq) {
7233                                         /* I have circled */
7234                                         break;
7235                                 }
7236                                 continue;
7237                         }
7238                 }
7239                 giveup = 0;
7240                 bail = 0;
7241                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7242                     &giveup, eeor_mode, &bail);
7243                 if (moved_how_much)
7244                         asoc->last_out_stream = strq;
7245
7246                 if (locked) {
7247                         asoc->locked_on_sending = strq;
7248                         if ((moved_how_much == 0) || (giveup) || bail)
7249                                 /* no more to move for now */
7250                                 break;
7251                 } else {
7252                         asoc->locked_on_sending = NULL;
7253                         if (TAILQ_EMPTY(&strq->outqueue)) {
7254                                 if (strq == strqn) {
7255                                         /* Must move start to next one */
7256                                         strqn = TAILQ_NEXT(strq, next_spoke);
7257                                         if (strqn == NULL) {
7258                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7259                                                 if (strqn == NULL) {
7260                                                         break;
7261                                                 }
7262                                         }
7263                                 }
7264                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7265                         }
7266                         if ((giveup) || bail) {
7267                                 break;
7268                         }
7269                         strq = sctp_select_a_stream(stcb, asoc);
7270                         if (strq == NULL) {
7271                                 break;
7272                         }
7273                 }
7274                 total_moved += moved_how_much;
7275                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7276                 goal_mtu &= 0xfffffffc;
7277         }
7278         if (bail)
7279                 *quit_now = 1;
7280
7281         if (total_moved == 0) {
7282                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7283                     (net == stcb->asoc.primary_destination)) {
7284                         /* ran dry for primary network net */
7285                         SCTP_STAT_INCR(sctps_primary_randry);
7286                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7287                         /* ran dry with CMT on */
7288                         SCTP_STAT_INCR(sctps_cmt_randry);
7289                 }
7290         }
7291 }
7292
7293 void
7294 sctp_fix_ecn_echo(struct sctp_association *asoc)
7295 {
7296         struct sctp_tmit_chunk *chk;
7297
7298         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7299                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7300                         chk->sent = SCTP_DATAGRAM_UNSENT;
7301                 }
7302         }
7303 }
7304
7305 static void
7306 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7307     struct sctp_association *asoc,
7308     struct sctp_nets *net)
7309 {
7310         struct sctp_tmit_chunk *chk;
7311         struct sctp_nets *a_net;
7312
7313         SCTP_TCB_LOCK_ASSERT(stcb);
7314         /*
7315          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7316          * destination using the PF algorithm for finding alternate
7317          * destinations.
7318          */
7319         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7320                 a_net = sctp_find_alternate_net(stcb, net, 2);
7321         } else {
7322                 a_net = sctp_find_alternate_net(stcb, net, 0);
7323         }
7324         if ((a_net != net) &&
7325             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7326                 /*
7327                  * We only proceed if a valid alternate is found that is not
7328                  * this one and is reachable. Here we must move all chunks
7329                  * queued in the send queue off of the destination address
7330                  * to our alternate.
7331                  */
7332                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7333                         if (chk->whoTo == net) {
7334                                 /* Move the chunk to our alternate */
7335                                 sctp_free_remote_addr(chk->whoTo);
7336                                 chk->whoTo = a_net;
7337                                 atomic_add_int(&a_net->ref_count, 1);
7338                         }
7339                 }
7340         }
7341 }
7342
7343 int
7344 sctp_med_chunk_output(struct sctp_inpcb *inp,
7345     struct sctp_tcb *stcb,
7346     struct sctp_association *asoc,
7347     int *num_out,
7348     int *reason_code,
7349     int control_only, int from_where,
7350     struct timeval *now, int *now_filled, int frag_point, int so_locked
7351 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7352     SCTP_UNUSED
7353 #endif
7354 )
7355 {
7356         /*
7357          * Ok this is the generic chunk service queue. we must do the
7358          * following: - Service the stream queue that is next, moving any
7359          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7360          * LAST to the out queue in one pass) and assigning TSN's - Check to
7361          * see if the cwnd/rwnd allows any output, if so we go ahead and
7362          * fomulate and send the low level chunks. Making sure to combine
7363          * any control in the control chunk queue also.
7364          */
7365         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7366         struct mbuf *outchain, *endoutchain;
7367         struct sctp_tmit_chunk *chk, *nchk;
7368
7369         /* temp arrays for unlinking */
7370         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7371         int no_fragmentflg, error;
7372         unsigned int max_rwnd_per_dest;
7373         int one_chunk, hbflag, skip_data_for_this_net;
7374         int asconf, cookie, no_out_cnt;
7375         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7376         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7377         int tsns_sent = 0;
7378         uint32_t auth_offset = 0;
7379         struct sctp_auth_chunk *auth = NULL;
7380         uint16_t auth_keyid;
7381         int override_ok = 1;
7382         int data_auth_reqd = 0;
7383
7384         /*
7385          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7386          * destination.
7387          */
7388         int pf_hbflag = 0;
7389         int quit_now = 0;
7390
7391         *num_out = 0;
7392         auth_keyid = stcb->asoc.authinfo.active_keyid;
7393
7394         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7395             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7396             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7397                 eeor_mode = 1;
7398         } else {
7399                 eeor_mode = 0;
7400         }
7401         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7402         /*
7403          * First lets prime the pump. For each destination, if there is room
7404          * in the flight size, attempt to pull an MTU's worth out of the
7405          * stream queues into the general send_queue
7406          */
7407 #ifdef SCTP_AUDITING_ENABLED
7408         sctp_audit_log(0xC2, 2);
7409 #endif
7410         SCTP_TCB_LOCK_ASSERT(stcb);
7411         hbflag = 0;
7412         if ((control_only) || (asoc->stream_reset_outstanding))
7413                 no_data_chunks = 1;
7414         else
7415                 no_data_chunks = 0;
7416
7417         /* Nothing to possible to send? */
7418         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7419             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7420             TAILQ_EMPTY(&asoc->send_queue) &&
7421             TAILQ_EMPTY(&asoc->out_wheel)) {
7422                 *reason_code = 9;
7423                 return (0);
7424         }
7425         if (asoc->peers_rwnd == 0) {
7426                 /* No room in peers rwnd */
7427                 *reason_code = 1;
7428                 if (asoc->total_flight > 0) {
7429                         /* we are allowed one chunk in flight */
7430                         no_data_chunks = 1;
7431                 }
7432         }
7433         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7434         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7435                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7436                         /*
7437                          * This for loop we are in takes in each net, if
7438                          * its's got space in cwnd and has data sent to it
7439                          * (when CMT is off) then it calls
7440                          * sctp_fill_outqueue for the net. This gets data on
7441                          * the send queue for that network.
7442                          *
7443                          * In sctp_fill_outqueue TSN's are assigned and data is
7444                          * copied out of the stream buffers. Note mostly
7445                          * copy by reference (we hope).
7446                          */
7447                         net->window_probe = 0;
7448                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7449                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7450                                         sctp_log_cwnd(stcb, net, 1,
7451                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7452                                 }
7453                                 continue;
7454                         }
7455                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7456                                 /* nothing can be in queue for this guy */
7457                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7458                                         sctp_log_cwnd(stcb, net, 2,
7459                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7460                                 }
7461                                 continue;
7462                         }
7463                         if (net->flight_size >= net->cwnd) {
7464                                 /* skip this network, no room - can't fill */
7465                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7466                                         sctp_log_cwnd(stcb, net, 3,
7467                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7468                                 }
7469                                 continue;
7470                         }
7471                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7472                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7473                         }
7474                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7475                         if (quit_now) {
7476                                 /* memory alloc failure */
7477                                 no_data_chunks = 1;
7478                                 break;
7479                         }
7480                 }
7481         }
7482         /* now service each destination and send out what we can for it */
7483         /* Nothing to send? */
7484         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7485             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7486             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7487                 *reason_code = 8;
7488                 return (0);
7489         }
7490         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7491                 /* get the last start point */
7492                 start_at = asoc->last_net_cmt_send_started;
7493                 if (start_at == NULL) {
7494                         /* null so to beginning */
7495                         start_at = TAILQ_FIRST(&asoc->nets);
7496                 } else {
7497                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7498                         if (start_at == NULL) {
7499                                 start_at = TAILQ_FIRST(&asoc->nets);
7500                         }
7501                 }
7502                 asoc->last_net_cmt_send_started = start_at;
7503         } else {
7504                 start_at = TAILQ_FIRST(&asoc->nets);
7505         }
7506         old_start_at = NULL;
7507 again_one_more_time:
7508         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7509                 /* how much can we send? */
7510                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7511                 if (old_start_at && (old_start_at == net)) {
7512                         /* through list ocmpletely. */
7513                         break;
7514                 }
7515                 tsns_sent = 0xa;
7516                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7517                         /*
7518                          * Ref-count of 1 so we cannot have data or control
7519                          * queued to this address. Skip it (non-CMT).
7520                          */
7521                         continue;
7522                 }
7523                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7524                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7525                     (net->flight_size >= net->cwnd)) {
7526                         /*
7527                          * Nothing on control or asconf and flight is full,
7528                          * we can skip even in the CMT case.
7529                          */
7530                         continue;
7531                 }
7532                 ctl_cnt = bundle_at = 0;
7533                 endoutchain = outchain = NULL;
7534                 no_fragmentflg = 1;
7535                 one_chunk = 0;
7536                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7537                         skip_data_for_this_net = 1;
7538                 } else {
7539                         skip_data_for_this_net = 0;
7540                 }
7541                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7542                         /*
7543                          * if we have a route and an ifp check to see if we
7544                          * have room to send to this guy
7545                          */
7546                         struct ifnet *ifp;
7547
7548                         ifp = net->ro.ro_rt->rt_ifp;
7549                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7550                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7551                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7552                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7553                                 }
7554                                 continue;
7555                         }
7556                 }
7557                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7558                 case AF_INET:
7559                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7560                         break;
7561 #ifdef INET6
7562                 case AF_INET6:
7563                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7564                         break;
7565 #endif
7566                 default:
7567                         /* TSNH */
7568                         mtu = net->mtu;
7569                         break;
7570                 }
7571                 mx_mtu = mtu;
7572                 to_out = 0;
7573                 if (mtu > asoc->peers_rwnd) {
7574                         if (asoc->total_flight > 0) {
7575                                 /* We have a packet in flight somewhere */
7576                                 r_mtu = asoc->peers_rwnd;
7577                         } else {
7578                                 /* We are always allowed to send one MTU out */
7579                                 one_chunk = 1;
7580                                 r_mtu = mtu;
7581                         }
7582                 } else {
7583                         r_mtu = mtu;
7584                 }
7585                 /************************/
7586                 /* ASCONF transmission */
7587                 /************************/
7588                 /* Now first lets go through the asconf queue */
7589                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7590                     chk; chk = nchk) {
7591                         nchk = TAILQ_NEXT(chk, sctp_next);
7592                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7593                                 continue;
7594                         }
7595                         if (chk->whoTo != net) {
7596                                 /*
7597                                  * No, not sent to the network we are
7598                                  * looking at
7599                                  */
7600                                 break;
7601                         }
7602                         if (chk->data == NULL) {
7603                                 break;
7604                         }
7605                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7606                             chk->sent != SCTP_DATAGRAM_RESEND) {
7607                                 break;
7608                         }
7609                         /*
7610                          * if no AUTH is yet included and this chunk
7611                          * requires it, make sure to account for it.  We
7612                          * don't apply the size until the AUTH chunk is
7613                          * actually added below in case there is no room for
7614                          * this chunk. NOTE: we overload the use of "omtu"
7615                          * here
7616                          */
7617                         if ((auth == NULL) &&
7618                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7619                             stcb->asoc.peer_auth_chunks)) {
7620                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7621                         } else
7622                                 omtu = 0;
7623                         /* Here we do NOT factor the r_mtu */
7624                         if ((chk->send_size < (int)(mtu - omtu)) ||
7625                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7626                                 /*
7627                                  * We probably should glom the mbuf chain
7628                                  * from the chk->data for control but the
7629                                  * problem is it becomes yet one more level
7630                                  * of tracking to do if for some reason
7631                                  * output fails. Then I have got to
7632                                  * reconstruct the merged control chain.. el
7633                                  * yucko.. for now we take the easy way and
7634                                  * do the copy
7635                                  */
7636                                 /*
7637                                  * Add an AUTH chunk, if chunk requires it
7638                                  * save the offset into the chain for AUTH
7639                                  */
7640                                 if ((auth == NULL) &&
7641                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7642                                     stcb->asoc.peer_auth_chunks))) {
7643                                         outchain = sctp_add_auth_chunk(outchain,
7644                                             &endoutchain,
7645                                             &auth,
7646                                             &auth_offset,
7647                                             stcb,
7648                                             chk->rec.chunk_id.id);
7649                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7650                                 }
7651                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7652                                     (int)chk->rec.chunk_id.can_take_data,
7653                                     chk->send_size, chk->copy_by_ref);
7654                                 if (outchain == NULL) {
7655                                         *reason_code = 8;
7656                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7657                                         return (ENOMEM);
7658                                 }
7659                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7660                                 /* update our MTU size */
7661                                 if (mtu > (chk->send_size + omtu))
7662                                         mtu -= (chk->send_size + omtu);
7663                                 else
7664                                         mtu = 0;
7665                                 to_out += (chk->send_size + omtu);
7666                                 /* Do clear IP_DF ? */
7667                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7668                                         no_fragmentflg = 0;
7669                                 }
7670                                 if (chk->rec.chunk_id.can_take_data)
7671                                         chk->data = NULL;
7672                                 /*
7673                                  * set hb flag since we can use these for
7674                                  * RTO
7675                                  */
7676                                 hbflag = 1;
7677                                 asconf = 1;
7678                                 /*
7679                                  * should sysctl this: don't bundle data
7680                                  * with ASCONF since it requires AUTH
7681                                  */
7682                                 no_data_chunks = 1;
7683                                 chk->sent = SCTP_DATAGRAM_SENT;
7684                                 chk->snd_count++;
7685                                 if (mtu == 0) {
7686                                         /*
7687                                          * Ok we are out of room but we can
7688                                          * output without effecting the
7689                                          * flight size since this little guy
7690                                          * is a control only packet.
7691                                          */
7692                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7693                                         /*
7694                                          * do NOT clear the asconf flag as
7695                                          * it is used to do appropriate
7696                                          * source address selection.
7697                                          */
7698                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7699                                             (struct sockaddr *)&net->ro._l_addr,
7700                                             outchain, auth_offset, auth,
7701                                             stcb->asoc.authinfo.active_keyid,
7702                                             no_fragmentflg, 0, NULL, asconf,
7703                                             inp->sctp_lport, stcb->rport,
7704                                             htonl(stcb->asoc.peer_vtag),
7705                                             net->port, so_locked, NULL))) {
7706                                                 if (error == ENOBUFS) {
7707                                                         asoc->ifp_had_enobuf = 1;
7708                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7709                                                 }
7710                                                 if (from_where == 0) {
7711                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7712                                                 }
7713                                                 if (*now_filled == 0) {
7714                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7715                                                         *now_filled = 1;
7716                                                         *now = net->last_sent_time;
7717                                                 } else {
7718                                                         net->last_sent_time = *now;
7719                                                 }
7720                                                 hbflag = 0;
7721                                                 /* error, could not output */
7722                                                 if (error == EHOSTUNREACH) {
7723                                                         /*
7724                                                          * Destination went
7725                                                          * unreachable
7726                                                          * during this send
7727                                                          */
7728                                                         sctp_move_to_an_alt(stcb, asoc, net);
7729                                                 }
7730                                                 *reason_code = 7;
7731                                                 continue;
7732                                         } else
7733                                                 asoc->ifp_had_enobuf = 0;
7734                                         if (*now_filled == 0) {
7735                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7736                                                 *now_filled = 1;
7737                                                 *now = net->last_sent_time;
7738                                         } else {
7739                                                 net->last_sent_time = *now;
7740                                         }
7741                                         hbflag = 0;
7742                                         /*
7743                                          * increase the number we sent, if a
7744                                          * cookie is sent we don't tell them
7745                                          * any was sent out.
7746                                          */
7747                                         outchain = endoutchain = NULL;
7748                                         auth = NULL;
7749                                         auth_offset = 0;
7750                                         if (!no_out_cnt)
7751                                                 *num_out += ctl_cnt;
7752                                         /* recalc a clean slate and setup */
7753                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7754                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7755                                         } else {
7756                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7757                                         }
7758                                         to_out = 0;
7759                                         no_fragmentflg = 1;
7760                                 }
7761                         }
7762                 }
7763                 /************************/
7764                 /* Control transmission */
7765                 /************************/
7766                 /* Now first lets go through the control queue */
7767                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7768                     chk; chk = nchk) {
7769                         nchk = TAILQ_NEXT(chk, sctp_next);
7770                         if (chk->whoTo != net) {
7771                                 /*
7772                                  * No, not sent to the network we are
7773                                  * looking at
7774                                  */
7775                                 continue;
7776                         }
7777                         if (chk->data == NULL) {
7778                                 continue;
7779                         }
7780                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7781                                 /*
7782                                  * It must be unsent. Cookies and ASCONF's
7783                                  * hang around but there timers will force
7784                                  * when marked for resend.
7785                                  */
7786                                 continue;
7787                         }
7788                         /*
7789                          * if no AUTH is yet included and this chunk
7790                          * requires it, make sure to account for it.  We
7791                          * don't apply the size until the AUTH chunk is
7792                          * actually added below in case there is no room for
7793                          * this chunk. NOTE: we overload the use of "omtu"
7794                          * here
7795                          */
7796                         if ((auth == NULL) &&
7797                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7798                             stcb->asoc.peer_auth_chunks)) {
7799                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7800                         } else
7801                                 omtu = 0;
7802                         /* Here we do NOT factor the r_mtu */
7803                         if ((chk->send_size < (int)(mtu - omtu)) ||
7804                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7805                                 /*
7806                                  * We probably should glom the mbuf chain
7807                                  * from the chk->data for control but the
7808                                  * problem is it becomes yet one more level
7809                                  * of tracking to do if for some reason
7810                                  * output fails. Then I have got to
7811                                  * reconstruct the merged control chain.. el
7812                                  * yucko.. for now we take the easy way and
7813                                  * do the copy
7814                                  */
7815                                 /*
7816                                  * Add an AUTH chunk, if chunk requires it
7817                                  * save the offset into the chain for AUTH
7818                                  */
7819                                 if ((auth == NULL) &&
7820                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7821                                     stcb->asoc.peer_auth_chunks))) {
7822                                         outchain = sctp_add_auth_chunk(outchain,
7823                                             &endoutchain,
7824                                             &auth,
7825                                             &auth_offset,
7826                                             stcb,
7827                                             chk->rec.chunk_id.id);
7828                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7829                                 }
7830                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7831                                     (int)chk->rec.chunk_id.can_take_data,
7832                                     chk->send_size, chk->copy_by_ref);
7833                                 if (outchain == NULL) {
7834                                         *reason_code = 8;
7835                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7836                                         return (ENOMEM);
7837                                 }
7838                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7839                                 /* update our MTU size */
7840                                 if (mtu > (chk->send_size + omtu))
7841                                         mtu -= (chk->send_size + omtu);
7842                                 else
7843                                         mtu = 0;
7844                                 to_out += (chk->send_size + omtu);
7845                                 /* Do clear IP_DF ? */
7846                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7847                                         no_fragmentflg = 0;
7848                                 }
7849                                 if (chk->rec.chunk_id.can_take_data)
7850                                         chk->data = NULL;
7851                                 /* Mark things to be removed, if needed */
7852                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7853                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7854                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7855                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7856                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7857                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7858                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7859                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7860                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7861                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7862                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7863
7864                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7865                                                 hbflag = 1;
7866                                                 /*
7867                                                  * JRS 5/14/07 - Set the
7868                                                  * flag to say a heartbeat
7869                                                  * is being sent.
7870                                                  */
7871                                                 pf_hbflag = 1;
7872                                         }
7873                                         /* remove these chunks at the end */
7874                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7875                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7876                                                 /* turn off the timer */
7877                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7878                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7879                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7880                                                 }
7881                                         }
7882                                         ctl_cnt++;
7883                                 } else {
7884                                         /*
7885                                          * Other chunks, since they have
7886                                          * timers running (i.e. COOKIE) we
7887                                          * just "trust" that it gets sent or
7888                                          * retransmitted.
7889                                          */
7890                                         ctl_cnt++;
7891                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7892                                                 cookie = 1;
7893                                                 no_out_cnt = 1;
7894                                         }
7895                                         chk->sent = SCTP_DATAGRAM_SENT;
7896                                         chk->snd_count++;
7897                                 }
7898                                 if (mtu == 0) {
7899                                         /*
7900                                          * Ok we are out of room but we can
7901                                          * output without effecting the
7902                                          * flight size since this little guy
7903                                          * is a control only packet.
7904                                          */
7905                                         if (asconf) {
7906                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7907                                                 /*
7908                                                  * do NOT clear the asconf
7909                                                  * flag as it is used to do
7910                                                  * appropriate source
7911                                                  * address selection.
7912                                                  */
7913                                         }
7914                                         if (cookie) {
7915                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7916                                                 cookie = 0;
7917                                         }
7918                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7919                                             (struct sockaddr *)&net->ro._l_addr,
7920                                             outchain,
7921                                             auth_offset, auth,
7922                                             stcb->asoc.authinfo.active_keyid,
7923                                             no_fragmentflg, 0, NULL, asconf,
7924                                             inp->sctp_lport, stcb->rport,
7925                                             htonl(stcb->asoc.peer_vtag),
7926                                             net->port, so_locked, NULL))) {
7927                                                 if (error == ENOBUFS) {
7928                                                         asoc->ifp_had_enobuf = 1;
7929                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7930                                                 }
7931                                                 if (from_where == 0) {
7932                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7933                                                 }
7934                                                 /* error, could not output */
7935                                                 if (hbflag) {
7936                                                         if (*now_filled == 0) {
7937                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7938                                                                 *now_filled = 1;
7939                                                                 *now = net->last_sent_time;
7940                                                         } else {
7941                                                                 net->last_sent_time = *now;
7942                                                         }
7943                                                         hbflag = 0;
7944                                                 }
7945                                                 if (error == EHOSTUNREACH) {
7946                                                         /*
7947                                                          * Destination went
7948                                                          * unreachable
7949                                                          * during this send
7950                                                          */
7951                                                         sctp_move_to_an_alt(stcb, asoc, net);
7952                                                 }
7953                                                 *reason_code = 7;
7954                                                 continue;
7955                                         } else
7956                                                 asoc->ifp_had_enobuf = 0;
7957                                         /* Only HB or ASCONF advances time */
7958                                         if (hbflag) {
7959                                                 if (*now_filled == 0) {
7960                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7961                                                         *now_filled = 1;
7962                                                         *now = net->last_sent_time;
7963                                                 } else {
7964                                                         net->last_sent_time = *now;
7965                                                 }
7966                                                 hbflag = 0;
7967                                         }
7968                                         /*
7969                                          * increase the number we sent, if a
7970                                          * cookie is sent we don't tell them
7971                                          * any was sent out.
7972                                          */
7973                                         outchain = endoutchain = NULL;
7974                                         auth = NULL;
7975                                         auth_offset = 0;
7976                                         if (!no_out_cnt)
7977                                                 *num_out += ctl_cnt;
7978                                         /* recalc a clean slate and setup */
7979                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7980                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7981                                         } else {
7982                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7983                                         }
7984                                         to_out = 0;
7985                                         no_fragmentflg = 1;
7986                                 }
7987                         }
7988                 }
7989                 /* JRI: if dest is in PF state, do not send data to it */
7990                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
7991                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
7992                     (net->dest_state & SCTP_ADDR_PF)) {
7993                         goto no_data_fill;
7994                 }
7995                 if (net->flight_size >= net->cwnd) {
7996                         goto no_data_fill;
7997                 }
7998                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) &&
7999                     (net->flight_size > max_rwnd_per_dest)) {
8000                         goto no_data_fill;
8001                 }
8002                 /*********************/
8003                 /* Data transmission */
8004                 /*********************/
8005                 /*
8006                  * if AUTH for DATA is required and no AUTH has been added
8007                  * yet, account for this in the mtu now... if no data can be
8008                  * bundled, this adjustment won't matter anyways since the
8009                  * packet will be going out...
8010                  */
8011                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8012                     stcb->asoc.peer_auth_chunks);
8013                 if (data_auth_reqd && (auth == NULL)) {
8014                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8015                 }
8016                 /* now lets add any data within the MTU constraints */
8017                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8018                 case AF_INET:
8019                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8020                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8021                         else
8022                                 omtu = 0;
8023                         break;
8024 #ifdef INET6
8025                 case AF_INET6:
8026                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8027                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8028                         else
8029                                 omtu = 0;
8030                         break;
8031 #endif
8032                 default:
8033                         /* TSNH */
8034                         omtu = 0;
8035                         break;
8036                 }
8037                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8038                     (skip_data_for_this_net == 0)) ||
8039                     (cookie)) {
8040                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8041                                 if (no_data_chunks) {
8042                                         /* let only control go out */
8043                                         *reason_code = 1;
8044                                         break;
8045                                 }
8046                                 if (net->flight_size >= net->cwnd) {
8047                                         /* skip this net, no room for data */
8048                                         *reason_code = 2;
8049                                         break;
8050                                 }
8051                                 nchk = TAILQ_NEXT(chk, sctp_next);
8052                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
8053                                         if (chk->whoTo != net) {
8054                                                 /*
8055                                                  * For CMT, steal the data
8056                                                  * to this network if its
8057                                                  * not set here.
8058                                                  */
8059                                                 sctp_free_remote_addr(chk->whoTo);
8060                                                 chk->whoTo = net;
8061                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8062                                         }
8063                                 } else if (chk->whoTo != net) {
8064                                         /* No, not sent to this net */
8065                                         continue;
8066                                 }
8067                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8068                                         /*-
8069                                          * strange, we have a chunk that is
8070                                          * to big for its destination and
8071                                          * yet no fragment ok flag.
8072                                          * Something went wrong when the
8073                                          * PMTU changed...we did not mark
8074                                          * this chunk for some reason?? I
8075                                          * will fix it here by letting IP
8076                                          * fragment it for now and printing
8077                                          * a warning. This really should not
8078                                          * happen ...
8079                                          */
8080                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8081                                             chk->send_size, mtu);
8082                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8083                                 }
8084                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8085                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8086                                         struct sctp_data_chunk *dchkh;
8087
8088                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8089                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8090                                 }
8091                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8092                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8093                                         /* ok we will add this one */
8094
8095                                         /*
8096                                          * Add an AUTH chunk, if chunk
8097                                          * requires it, save the offset into
8098                                          * the chain for AUTH
8099                                          */
8100                                         if (data_auth_reqd) {
8101                                                 if (auth == NULL) {
8102                                                         outchain = sctp_add_auth_chunk(outchain,
8103                                                             &endoutchain,
8104                                                             &auth,
8105                                                             &auth_offset,
8106                                                             stcb,
8107                                                             SCTP_DATA);
8108                                                         auth_keyid = chk->auth_keyid;
8109                                                         override_ok = 0;
8110                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8111                                                 } else if (override_ok) {
8112                                                         /*
8113                                                          * use this data's
8114                                                          * keyid
8115                                                          */
8116                                                         auth_keyid = chk->auth_keyid;
8117                                                         override_ok = 0;
8118                                                 } else if (auth_keyid != chk->auth_keyid) {
8119                                                         /*
8120                                                          * different keyid,
8121                                                          * so done bundling
8122                                                          */
8123                                                         break;
8124                                                 }
8125                                         }
8126                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8127                                             chk->send_size, chk->copy_by_ref);
8128                                         if (outchain == NULL) {
8129                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8130                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8131                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8132                                                 }
8133                                                 *reason_code = 3;
8134                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8135                                                 return (ENOMEM);
8136                                         }
8137                                         /* upate our MTU size */
8138                                         /* Do clear IP_DF ? */
8139                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8140                                                 no_fragmentflg = 0;
8141                                         }
8142                                         /* unsigned subtraction of mtu */
8143                                         if (mtu > chk->send_size)
8144                                                 mtu -= chk->send_size;
8145                                         else
8146                                                 mtu = 0;
8147                                         /* unsigned subtraction of r_mtu */
8148                                         if (r_mtu > chk->send_size)
8149                                                 r_mtu -= chk->send_size;
8150                                         else
8151                                                 r_mtu = 0;
8152
8153                                         to_out += chk->send_size;
8154                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8155 #ifdef INVARIANTS
8156                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8157 #else
8158                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8159                                                     mx_mtu, to_out);
8160 #endif
8161                                         }
8162                                         chk->window_probe = 0;
8163                                         data_list[bundle_at++] = chk;
8164                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8165                                                 mtu = 0;
8166                                                 break;
8167                                         }
8168                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8169                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8170                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8171                                                 } else {
8172                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8173                                                 }
8174                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8175                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8176                                                         /*
8177                                                          * Count number of
8178                                                          * user msg's that
8179                                                          * were fragmented
8180                                                          * we do this by
8181                                                          * counting when we
8182                                                          * see a LAST
8183                                                          * fragment only.
8184                                                          */
8185                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8186                                         }
8187                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8188                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8189                                                         data_list[0]->window_probe = 1;
8190                                                         net->window_probe = 1;
8191                                                 }
8192                                                 break;
8193                                         }
8194                                 } else {
8195                                         /*
8196                                          * Must be sent in order of the
8197                                          * TSN's (on a network)
8198                                          */
8199                                         break;
8200                                 }
8201                         }       /* for (chunk gather loop for this net) */
8202                 }               /* if asoc.state OPEN */
8203 no_data_fill:
8204                 /* Is there something to send for this destination? */
8205                 if (outchain) {
8206                         /* We may need to start a control timer or two */
8207                         if (asconf) {
8208                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8209                                     stcb, net);
8210                                 /*
8211                                  * do NOT clear the asconf flag as it is
8212                                  * used to do appropriate source address
8213                                  * selection.
8214                                  */
8215                         }
8216                         if (cookie) {
8217                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8218                                 cookie = 0;
8219                         }
8220                         /* must start a send timer if data is being sent */
8221                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8222                                 /*
8223                                  * no timer running on this destination
8224                                  * restart it.
8225                                  */
8226                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8227                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8228                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8229                                     pf_hbflag &&
8230                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8231                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8232                                 /*
8233                                  * JRS 5/14/07 - If a HB has been sent to a
8234                                  * PF destination and no T3 timer is
8235                                  * currently running, start the T3 timer to
8236                                  * track the HBs that were sent.
8237                                  */
8238                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8239                         }
8240                         /* Now send it, if there is anything to send :> */
8241                         if ((error = sctp_lowlevel_chunk_output(inp,
8242                             stcb,
8243                             net,
8244                             (struct sockaddr *)&net->ro._l_addr,
8245                             outchain,
8246                             auth_offset,
8247                             auth,
8248                             auth_keyid,
8249                             no_fragmentflg,
8250                             bundle_at,
8251                             data_list[0],
8252                             asconf,
8253                             inp->sctp_lport, stcb->rport,
8254                             htonl(stcb->asoc.peer_vtag),
8255                             net->port, so_locked, NULL))) {
8256                                 /* error, we could not output */
8257                                 if (error == ENOBUFS) {
8258                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8259                                         asoc->ifp_had_enobuf = 1;
8260                                 }
8261                                 if (from_where == 0) {
8262                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8263                                 }
8264                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8265                                 if (hbflag) {
8266                                         if (*now_filled == 0) {
8267                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8268                                                 *now_filled = 1;
8269                                                 *now = net->last_sent_time;
8270                                         } else {
8271                                                 net->last_sent_time = *now;
8272                                         }
8273                                         hbflag = 0;
8274                                 }
8275                                 if (error == EHOSTUNREACH) {
8276                                         /*
8277                                          * Destination went unreachable
8278                                          * during this send
8279                                          */
8280                                         sctp_move_to_an_alt(stcb, asoc, net);
8281                                 }
8282                                 *reason_code = 6;
8283                                 /*-
8284                                  * I add this line to be paranoid. As far as
8285                                  * I can tell the continue, takes us back to
8286                                  * the top of the for, but just to make sure
8287                                  * I will reset these again here.
8288                                  */
8289                                 ctl_cnt = bundle_at = 0;
8290                                 continue;       /* This takes us back to the
8291                                                  * for() for the nets. */
8292                         } else {
8293                                 asoc->ifp_had_enobuf = 0;
8294                         }
8295                         outchain = endoutchain = NULL;
8296                         auth = NULL;
8297                         auth_offset = 0;
8298                         if (bundle_at || hbflag) {
8299                                 /* For data/asconf and hb set time */
8300                                 if (*now_filled == 0) {
8301                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8302                                         *now_filled = 1;
8303                                         *now = net->last_sent_time;
8304                                 } else {
8305                                         net->last_sent_time = *now;
8306                                 }
8307                         }
8308                         if (!no_out_cnt) {
8309                                 *num_out += (ctl_cnt + bundle_at);
8310                         }
8311                         if (bundle_at) {
8312                                 /* setup for a RTO measurement */
8313                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8314                                 /* fill time if not already filled */
8315                                 if (*now_filled == 0) {
8316                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8317                                         *now_filled = 1;
8318                                         *now = asoc->time_last_sent;
8319                                 } else {
8320                                         asoc->time_last_sent = *now;
8321                                 }
8322                                 data_list[0]->do_rtt = 1;
8323                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8324                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8325                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8326                                         if (net->flight_size < net->cwnd) {
8327                                                 /* start or restart it */
8328                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8329                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8330                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8331                                                 }
8332                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8333                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8334                                         } else {
8335                                                 /* stop it if its running */
8336                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8337                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8338                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8339                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8340                                                 }
8341                                         }
8342                                 }
8343                         }
8344                         if (one_chunk) {
8345                                 break;
8346                         }
8347                 }
8348                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8349                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8350                 }
8351         }
8352         if (old_start_at == NULL) {
8353                 old_start_at = start_at;
8354                 start_at = TAILQ_FIRST(&asoc->nets);
8355                 if (old_start_at)
8356                         goto again_one_more_time;
8357         }
8358         /*
8359          * At the end there should be no NON timed chunks hanging on this
8360          * queue.
8361          */
8362         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8363                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8364         }
8365         if ((*num_out == 0) && (*reason_code == 0)) {
8366                 *reason_code = 4;
8367         } else {
8368                 *reason_code = 5;
8369         }
8370         sctp_clean_up_ctl(stcb, asoc);
8371         return (0);
8372 }
8373
8374 void
8375 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8376 {
8377         /*-
8378          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8379          * the control chunk queue.
8380          */
8381         struct sctp_chunkhdr *hdr;
8382         struct sctp_tmit_chunk *chk;
8383         struct mbuf *mat;
8384
8385         SCTP_TCB_LOCK_ASSERT(stcb);
8386         sctp_alloc_a_chunk(stcb, chk);
8387         if (chk == NULL) {
8388                 /* no memory */
8389                 sctp_m_freem(op_err);
8390                 return;
8391         }
8392         chk->copy_by_ref = 0;
8393         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8394         if (op_err == NULL) {
8395                 sctp_free_a_chunk(stcb, chk);
8396                 return;
8397         }
8398         chk->send_size = 0;
8399         mat = op_err;
8400         while (mat != NULL) {
8401                 chk->send_size += SCTP_BUF_LEN(mat);
8402                 mat = SCTP_BUF_NEXT(mat);
8403         }
8404         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8405         chk->rec.chunk_id.can_take_data = 1;
8406         chk->sent = SCTP_DATAGRAM_UNSENT;
8407         chk->snd_count = 0;
8408         chk->flags = 0;
8409         chk->asoc = &stcb->asoc;
8410         chk->data = op_err;
8411         chk->whoTo = chk->asoc->primary_destination;
8412         atomic_add_int(&chk->whoTo->ref_count, 1);
8413         hdr = mtod(op_err, struct sctp_chunkhdr *);
8414         hdr->chunk_type = SCTP_OPERATION_ERROR;
8415         hdr->chunk_flags = 0;
8416         hdr->chunk_length = htons(chk->send_size);
8417         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8418             chk,
8419             sctp_next);
8420         chk->asoc->ctrl_queue_cnt++;
8421 }
8422
8423 int
8424 sctp_send_cookie_echo(struct mbuf *m,
8425     int offset,
8426     struct sctp_tcb *stcb,
8427     struct sctp_nets *net)
8428 {
8429         /*-
8430          * pull out the cookie and put it at the front of the control chunk
8431          * queue.
8432          */
8433         int at;
8434         struct mbuf *cookie;
8435         struct sctp_paramhdr parm, *phdr;
8436         struct sctp_chunkhdr *hdr;
8437         struct sctp_tmit_chunk *chk;
8438         uint16_t ptype, plen;
8439
8440         /* First find the cookie in the param area */
8441         cookie = NULL;
8442         at = offset + sizeof(struct sctp_init_chunk);
8443
8444         SCTP_TCB_LOCK_ASSERT(stcb);
8445         do {
8446                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8447                 if (phdr == NULL) {
8448                         return (-3);
8449                 }
8450                 ptype = ntohs(phdr->param_type);
8451                 plen = ntohs(phdr->param_length);
8452                 if (ptype == SCTP_STATE_COOKIE) {
8453                         int pad;
8454
8455                         /* found the cookie */
8456                         if ((pad = (plen % 4))) {
8457                                 plen += 4 - pad;
8458                         }
8459                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8460                         if (cookie == NULL) {
8461                                 /* No memory */
8462                                 return (-2);
8463                         }
8464 #ifdef SCTP_MBUF_LOGGING
8465                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8466                                 struct mbuf *mat;
8467
8468                                 mat = cookie;
8469                                 while (mat) {
8470                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8471                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8472                                         }
8473                                         mat = SCTP_BUF_NEXT(mat);
8474                                 }
8475                         }
8476 #endif
8477                         break;
8478                 }
8479                 at += SCTP_SIZE32(plen);
8480         } while (phdr);
8481         if (cookie == NULL) {
8482                 /* Did not find the cookie */
8483                 return (-3);
8484         }
8485         /* ok, we got the cookie lets change it into a cookie echo chunk */
8486
8487         /* first the change from param to cookie */
8488         hdr = mtod(cookie, struct sctp_chunkhdr *);
8489         hdr->chunk_type = SCTP_COOKIE_ECHO;
8490         hdr->chunk_flags = 0;
8491         /* get the chunk stuff now and place it in the FRONT of the queue */
8492         sctp_alloc_a_chunk(stcb, chk);
8493         if (chk == NULL) {
8494                 /* no memory */
8495                 sctp_m_freem(cookie);
8496                 return (-5);
8497         }
8498         chk->copy_by_ref = 0;
8499         chk->send_size = plen;
8500         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8501         chk->rec.chunk_id.can_take_data = 0;
8502         chk->sent = SCTP_DATAGRAM_UNSENT;
8503         chk->snd_count = 0;
8504         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8505         chk->asoc = &stcb->asoc;
8506         chk->data = cookie;
8507         chk->whoTo = chk->asoc->primary_destination;
8508         atomic_add_int(&chk->whoTo->ref_count, 1);
8509         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8510         chk->asoc->ctrl_queue_cnt++;
8511         return (0);
8512 }
8513
8514 void
8515 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8516     struct mbuf *m,
8517     int offset,
8518     int chk_length,
8519     struct sctp_nets *net)
8520 {
8521         /*
8522          * take a HB request and make it into a HB ack and send it.
8523          */
8524         struct mbuf *outchain;
8525         struct sctp_chunkhdr *chdr;
8526         struct sctp_tmit_chunk *chk;
8527
8528
8529         if (net == NULL)
8530                 /* must have a net pointer */
8531                 return;
8532
8533         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8534         if (outchain == NULL) {
8535                 /* gak out of memory */
8536                 return;
8537         }
8538 #ifdef SCTP_MBUF_LOGGING
8539         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8540                 struct mbuf *mat;
8541
8542                 mat = outchain;
8543                 while (mat) {
8544                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8545                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8546                         }
8547                         mat = SCTP_BUF_NEXT(mat);
8548                 }
8549         }
8550 #endif
8551         chdr = mtod(outchain, struct sctp_chunkhdr *);
8552         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8553         chdr->chunk_flags = 0;
8554         if (chk_length % 4) {
8555                 /* need pad */
8556                 uint32_t cpthis = 0;
8557                 int padlen;
8558
8559                 padlen = 4 - (chk_length % 4);
8560                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8561         }
8562         sctp_alloc_a_chunk(stcb, chk);
8563         if (chk == NULL) {
8564                 /* no memory */
8565                 sctp_m_freem(outchain);
8566                 return;
8567         }
8568         chk->copy_by_ref = 0;
8569         chk->send_size = chk_length;
8570         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8571         chk->rec.chunk_id.can_take_data = 1;
8572         chk->sent = SCTP_DATAGRAM_UNSENT;
8573         chk->snd_count = 0;
8574         chk->flags = 0;
8575         chk->asoc = &stcb->asoc;
8576         chk->data = outchain;
8577         chk->whoTo = net;
8578         atomic_add_int(&chk->whoTo->ref_count, 1);
8579         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8580         chk->asoc->ctrl_queue_cnt++;
8581 }
8582
8583 void
8584 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8585 {
8586         /* formulate and queue a cookie-ack back to sender */
8587         struct mbuf *cookie_ack;
8588         struct sctp_chunkhdr *hdr;
8589         struct sctp_tmit_chunk *chk;
8590
8591         cookie_ack = NULL;
8592         SCTP_TCB_LOCK_ASSERT(stcb);
8593
8594         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8595         if (cookie_ack == NULL) {
8596                 /* no mbuf's */
8597                 return;
8598         }
8599         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8600         sctp_alloc_a_chunk(stcb, chk);
8601         if (chk == NULL) {
8602                 /* no memory */
8603                 sctp_m_freem(cookie_ack);
8604                 return;
8605         }
8606         chk->copy_by_ref = 0;
8607         chk->send_size = sizeof(struct sctp_chunkhdr);
8608         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8609         chk->rec.chunk_id.can_take_data = 1;
8610         chk->sent = SCTP_DATAGRAM_UNSENT;
8611         chk->snd_count = 0;
8612         chk->flags = 0;
8613         chk->asoc = &stcb->asoc;
8614         chk->data = cookie_ack;
8615         if (chk->asoc->last_control_chunk_from != NULL) {
8616                 chk->whoTo = chk->asoc->last_control_chunk_from;
8617         } else {
8618                 chk->whoTo = chk->asoc->primary_destination;
8619         }
8620         atomic_add_int(&chk->whoTo->ref_count, 1);
8621         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8622         hdr->chunk_type = SCTP_COOKIE_ACK;
8623         hdr->chunk_flags = 0;
8624         hdr->chunk_length = htons(chk->send_size);
8625         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8626         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8627         chk->asoc->ctrl_queue_cnt++;
8628         return;
8629 }
8630
8631
8632 void
8633 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8634 {
8635         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8636         struct mbuf *m_shutdown_ack;
8637         struct sctp_shutdown_ack_chunk *ack_cp;
8638         struct sctp_tmit_chunk *chk;
8639
8640         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8641         if (m_shutdown_ack == NULL) {
8642                 /* no mbuf's */
8643                 return;
8644         }
8645         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8646         sctp_alloc_a_chunk(stcb, chk);
8647         if (chk == NULL) {
8648                 /* no memory */
8649                 sctp_m_freem(m_shutdown_ack);
8650                 return;
8651         }
8652         chk->copy_by_ref = 0;
8653         chk->send_size = sizeof(struct sctp_chunkhdr);
8654         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8655         chk->rec.chunk_id.can_take_data = 1;
8656         chk->sent = SCTP_DATAGRAM_UNSENT;
8657         chk->snd_count = 0;
8658         chk->flags = 0;
8659         chk->asoc = &stcb->asoc;
8660         chk->data = m_shutdown_ack;
8661         chk->whoTo = net;
8662         atomic_add_int(&net->ref_count, 1);
8663
8664         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8665         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8666         ack_cp->ch.chunk_flags = 0;
8667         ack_cp->ch.chunk_length = htons(chk->send_size);
8668         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8669         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8670         chk->asoc->ctrl_queue_cnt++;
8671         return;
8672 }
8673
8674 void
8675 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8676 {
8677         /* formulate and queue a SHUTDOWN to the sender */
8678         struct mbuf *m_shutdown;
8679         struct sctp_shutdown_chunk *shutdown_cp;
8680         struct sctp_tmit_chunk *chk;
8681
8682         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8683         if (m_shutdown == NULL) {
8684                 /* no mbuf's */
8685                 return;
8686         }
8687         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8688         sctp_alloc_a_chunk(stcb, chk);
8689         if (chk == NULL) {
8690                 /* no memory */
8691                 sctp_m_freem(m_shutdown);
8692                 return;
8693         }
8694         chk->copy_by_ref = 0;
8695         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8696         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8697         chk->rec.chunk_id.can_take_data = 1;
8698         chk->sent = SCTP_DATAGRAM_UNSENT;
8699         chk->snd_count = 0;
8700         chk->flags = 0;
8701         chk->asoc = &stcb->asoc;
8702         chk->data = m_shutdown;
8703         chk->whoTo = net;
8704         atomic_add_int(&net->ref_count, 1);
8705
8706         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8707         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8708         shutdown_cp->ch.chunk_flags = 0;
8709         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8710         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8711         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8712         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8713         chk->asoc->ctrl_queue_cnt++;
8714         return;
8715 }
8716
8717 void
8718 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8719 {
8720         /*
8721          * formulate and queue an ASCONF to the peer. ASCONF parameters
8722          * should be queued on the assoc queue.
8723          */
8724         struct sctp_tmit_chunk *chk;
8725         struct mbuf *m_asconf;
8726         int len;
8727
8728         SCTP_TCB_LOCK_ASSERT(stcb);
8729
8730         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8731             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8732                 /* can't send a new one if there is one in flight already */
8733                 return;
8734         }
8735         /* compose an ASCONF chunk, maximum length is PMTU */
8736         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8737         if (m_asconf == NULL) {
8738                 return;
8739         }
8740         sctp_alloc_a_chunk(stcb, chk);
8741         if (chk == NULL) {
8742                 /* no memory */
8743                 sctp_m_freem(m_asconf);
8744                 return;
8745         }
8746         chk->copy_by_ref = 0;
8747         chk->data = m_asconf;
8748         chk->send_size = len;
8749         chk->rec.chunk_id.id = SCTP_ASCONF;
8750         chk->rec.chunk_id.can_take_data = 0;
8751         chk->sent = SCTP_DATAGRAM_UNSENT;
8752         chk->snd_count = 0;
8753         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8754         chk->asoc = &stcb->asoc;
8755         chk->whoTo = net;
8756         atomic_add_int(&chk->whoTo->ref_count, 1);
8757         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8758         chk->asoc->ctrl_queue_cnt++;
8759         return;
8760 }
8761
8762 void
8763 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8764 {
8765         /*
8766          * formulate and queue a asconf-ack back to sender. the asconf-ack
8767          * must be stored in the tcb.
8768          */
8769         struct sctp_tmit_chunk *chk;
8770         struct sctp_asconf_ack *ack, *latest_ack;
8771         struct mbuf *m_ack, *m;
8772         struct sctp_nets *net = NULL;
8773
8774         SCTP_TCB_LOCK_ASSERT(stcb);
8775         /* Get the latest ASCONF-ACK */
8776         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8777         if (latest_ack == NULL) {
8778                 return;
8779         }
8780         if (latest_ack->last_sent_to != NULL &&
8781             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8782                 /* we're doing a retransmission */
8783                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8784                 if (net == NULL) {
8785                         /* no alternate */
8786                         if (stcb->asoc.last_control_chunk_from == NULL)
8787                                 net = stcb->asoc.primary_destination;
8788                         else
8789                                 net = stcb->asoc.last_control_chunk_from;
8790                 }
8791         } else {
8792                 /* normal case */
8793                 if (stcb->asoc.last_control_chunk_from == NULL)
8794                         net = stcb->asoc.primary_destination;
8795                 else
8796                         net = stcb->asoc.last_control_chunk_from;
8797         }
8798         latest_ack->last_sent_to = net;
8799
8800         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8801                 if (ack->data == NULL) {
8802                         continue;
8803                 }
8804                 /* copy the asconf_ack */
8805                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8806                 if (m_ack == NULL) {
8807                         /* couldn't copy it */
8808                         return;
8809                 }
8810 #ifdef SCTP_MBUF_LOGGING
8811                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8812                         struct mbuf *mat;
8813
8814                         mat = m_ack;
8815                         while (mat) {
8816                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8817                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8818                                 }
8819                                 mat = SCTP_BUF_NEXT(mat);
8820                         }
8821                 }
8822 #endif
8823
8824                 sctp_alloc_a_chunk(stcb, chk);
8825                 if (chk == NULL) {
8826                         /* no memory */
8827                         if (m_ack)
8828                                 sctp_m_freem(m_ack);
8829                         return;
8830                 }
8831                 chk->copy_by_ref = 0;
8832
8833                 chk->whoTo = net;
8834                 chk->data = m_ack;
8835                 chk->send_size = 0;
8836                 /* Get size */
8837                 m = m_ack;
8838                 chk->send_size = ack->len;
8839                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8840                 chk->rec.chunk_id.can_take_data = 1;
8841                 chk->sent = SCTP_DATAGRAM_UNSENT;
8842                 chk->snd_count = 0;
8843                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8844                 chk->asoc = &stcb->asoc;
8845                 atomic_add_int(&chk->whoTo->ref_count, 1);
8846
8847                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8848                 chk->asoc->ctrl_queue_cnt++;
8849         }
8850         return;
8851 }
8852
8853
8854 static int
8855 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8856     struct sctp_tcb *stcb,
8857     struct sctp_association *asoc,
8858     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8859 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8860     SCTP_UNUSED
8861 #endif
8862 )
8863 {
8864         /*-
8865          * send out one MTU of retransmission. If fast_retransmit is
8866          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8867          * rwnd. For a Cookie or Asconf in the control chunk queue we
8868          * retransmit them by themselves.
8869          *
8870          * For data chunks we will pick out the lowest TSN's in the sent_queue
8871          * marked for resend and bundle them all together (up to a MTU of
8872          * destination). The address to send to should have been
8873          * selected/changed where the retransmission was marked (i.e. in FR
8874          * or t3-timeout routines).
8875          */
8876         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8877         struct sctp_tmit_chunk *chk, *fwd;
8878         struct mbuf *m, *endofchain;
8879         struct sctp_nets *net = NULL;
8880         uint32_t tsns_sent = 0;
8881         int no_fragmentflg, bundle_at, cnt_thru;
8882         unsigned int mtu;
8883         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8884         struct sctp_auth_chunk *auth = NULL;
8885         uint32_t auth_offset = 0;
8886         uint16_t auth_keyid;
8887         int override_ok = 1;
8888         int data_auth_reqd = 0;
8889         uint32_t dmtu = 0;
8890
8891         SCTP_TCB_LOCK_ASSERT(stcb);
8892         tmr_started = ctl_cnt = bundle_at = error = 0;
8893         no_fragmentflg = 1;
8894         fwd_tsn = 0;
8895         *cnt_out = 0;
8896         fwd = NULL;
8897         endofchain = m = NULL;
8898         auth_keyid = stcb->asoc.authinfo.active_keyid;
8899 #ifdef SCTP_AUDITING_ENABLED
8900         sctp_audit_log(0xC3, 1);
8901 #endif
8902         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8903             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8904                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8905                     asoc->sent_queue_retran_cnt);
8906                 asoc->sent_queue_cnt = 0;
8907                 asoc->sent_queue_cnt_removeable = 0;
8908                 /* send back 0/0 so we enter normal transmission */
8909                 *cnt_out = 0;
8910                 return (0);
8911         }
8912         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8913                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8914                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8915                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8916                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8917                                 continue;
8918                         }
8919                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8920                                 if (chk != asoc->str_reset) {
8921                                         /*
8922                                          * not eligible for retran if its
8923                                          * not ours
8924                                          */
8925                                         continue;
8926                                 }
8927                         }
8928                         ctl_cnt++;
8929                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8930                                 fwd_tsn = 1;
8931                                 fwd = chk;
8932                         }
8933                         /*
8934                          * Add an AUTH chunk, if chunk requires it save the
8935                          * offset into the chain for AUTH
8936                          */
8937                         if ((auth == NULL) &&
8938                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8939                             stcb->asoc.peer_auth_chunks))) {
8940                                 m = sctp_add_auth_chunk(m, &endofchain,
8941                                     &auth, &auth_offset,
8942                                     stcb,
8943                                     chk->rec.chunk_id.id);
8944                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8945                         }
8946                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8947                         break;
8948                 }
8949         }
8950         one_chunk = 0;
8951         cnt_thru = 0;
8952         /* do we have control chunks to retransmit? */
8953         if (m != NULL) {
8954                 /* Start a timer no matter if we suceed or fail */
8955                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8956                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8957                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8958                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8959                 chk->snd_count++;       /* update our count */
8960                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8961                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
8962                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
8963                     no_fragmentflg, 0, NULL, 0,
8964                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
8965                     chk->whoTo->port, so_locked, NULL))) {
8966                         SCTP_STAT_INCR(sctps_lowlevelerr);
8967                         return (error);
8968                 }
8969                 m = endofchain = NULL;
8970                 auth = NULL;
8971                 auth_offset = 0;
8972                 /*
8973                  * We don't want to mark the net->sent time here since this
8974                  * we use this for HB and retrans cannot measure RTT
8975                  */
8976                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8977                 *cnt_out += 1;
8978                 chk->sent = SCTP_DATAGRAM_SENT;
8979                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
8980                 if (fwd_tsn == 0) {
8981                         return (0);
8982                 } else {
8983                         /* Clean up the fwd-tsn list */
8984                         sctp_clean_up_ctl(stcb, asoc);
8985                         return (0);
8986                 }
8987         }
8988         /*
8989          * Ok, it is just data retransmission we need to do or that and a
8990          * fwd-tsn with it all.
8991          */
8992         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8993                 return (SCTP_RETRAN_DONE);
8994         }
8995         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8996             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8997                 /* not yet open, resend the cookie and that is it */
8998                 return (1);
8999         }
9000 #ifdef SCTP_AUDITING_ENABLED
9001         sctp_auditing(20, inp, stcb, NULL);
9002 #endif
9003         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9004         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9005                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9006                         /* No, not sent to this net or not ready for rtx */
9007                         continue;
9008                 }
9009                 if (chk->data == NULL) {
9010                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9011                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9012                         continue;
9013                 }
9014                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9015                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9016                         /* Gak, we have exceeded max unlucky retran, abort! */
9017                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9018                             chk->snd_count,
9019                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9020                         atomic_add_int(&stcb->asoc.refcnt, 1);
9021                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9022                         SCTP_TCB_LOCK(stcb);
9023                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9024                         return (SCTP_RETRAN_EXIT);
9025                 }
9026                 /* pick up the net */
9027                 net = chk->whoTo;
9028                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9029                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9030                 } else {
9031                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9032                 }
9033
9034                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9035                         /* No room in peers rwnd */
9036                         uint32_t tsn;
9037
9038                         tsn = asoc->last_acked_seq + 1;
9039                         if (tsn == chk->rec.data.TSN_seq) {
9040                                 /*
9041                                  * we make a special exception for this
9042                                  * case. The peer has no rwnd but is missing
9043                                  * the lowest chunk.. which is probably what
9044                                  * is holding up the rwnd.
9045                                  */
9046                                 goto one_chunk_around;
9047                         }
9048                         return (1);
9049                 }
9050 one_chunk_around:
9051                 if (asoc->peers_rwnd < mtu) {
9052                         one_chunk = 1;
9053                         if ((asoc->peers_rwnd == 0) &&
9054                             (asoc->total_flight == 0)) {
9055                                 chk->window_probe = 1;
9056                                 chk->whoTo->window_probe = 1;
9057                         }
9058                 }
9059 #ifdef SCTP_AUDITING_ENABLED
9060                 sctp_audit_log(0xC3, 2);
9061 #endif
9062                 bundle_at = 0;
9063                 m = NULL;
9064                 net->fast_retran_ip = 0;
9065                 if (chk->rec.data.doing_fast_retransmit == 0) {
9066                         /*
9067                          * if no FR in progress skip destination that have
9068                          * flight_size > cwnd.
9069                          */
9070                         if (net->flight_size >= net->cwnd) {
9071                                 continue;
9072                         }
9073                 } else {
9074                         /*
9075                          * Mark the destination net to have FR recovery
9076                          * limits put on it.
9077                          */
9078                         *fr_done = 1;
9079                         net->fast_retran_ip = 1;
9080                 }
9081
9082                 /*
9083                  * if no AUTH is yet included and this chunk requires it,
9084                  * make sure to account for it.  We don't apply the size
9085                  * until the AUTH chunk is actually added below in case
9086                  * there is no room for this chunk.
9087                  */
9088                 if (data_auth_reqd && (auth == NULL)) {
9089                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9090                 } else
9091                         dmtu = 0;
9092
9093                 if ((chk->send_size <= (mtu - dmtu)) ||
9094                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9095                         /* ok we will add this one */
9096                         if (data_auth_reqd) {
9097                                 if (auth == NULL) {
9098                                         m = sctp_add_auth_chunk(m,
9099                                             &endofchain,
9100                                             &auth,
9101                                             &auth_offset,
9102                                             stcb,
9103                                             SCTP_DATA);
9104                                         auth_keyid = chk->auth_keyid;
9105                                         override_ok = 0;
9106                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9107                                 } else if (override_ok) {
9108                                         auth_keyid = chk->auth_keyid;
9109                                         override_ok = 0;
9110                                 } else if (chk->auth_keyid != auth_keyid) {
9111                                         /* different keyid, so done bundling */
9112                                         break;
9113                                 }
9114                         }
9115                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9116                         if (m == NULL) {
9117                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9118                                 return (ENOMEM);
9119                         }
9120                         /* Do clear IP_DF ? */
9121                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9122                                 no_fragmentflg = 0;
9123                         }
9124                         /* upate our MTU size */
9125                         if (mtu > (chk->send_size + dmtu))
9126                                 mtu -= (chk->send_size + dmtu);
9127                         else
9128                                 mtu = 0;
9129                         data_list[bundle_at++] = chk;
9130                         if (one_chunk && (asoc->total_flight <= 0)) {
9131                                 SCTP_STAT_INCR(sctps_windowprobed);
9132                         }
9133                 }
9134                 if (one_chunk == 0) {
9135                         /*
9136                          * now are there anymore forward from chk to pick
9137                          * up?
9138                          */
9139                         fwd = TAILQ_NEXT(chk, sctp_next);
9140                         while (fwd) {
9141                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9142                                         /* Nope, not for retran */
9143                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9144                                         continue;
9145                                 }
9146                                 if (fwd->whoTo != net) {
9147                                         /* Nope, not the net in question */
9148                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9149                                         continue;
9150                                 }
9151                                 if (data_auth_reqd && (auth == NULL)) {
9152                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9153                                 } else
9154                                         dmtu = 0;
9155                                 if (fwd->send_size <= (mtu - dmtu)) {
9156                                         if (data_auth_reqd) {
9157                                                 if (auth == NULL) {
9158                                                         m = sctp_add_auth_chunk(m,
9159                                                             &endofchain,
9160                                                             &auth,
9161                                                             &auth_offset,
9162                                                             stcb,
9163                                                             SCTP_DATA);
9164                                                         auth_keyid = fwd->auth_keyid;
9165                                                         override_ok = 0;
9166                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9167                                                 } else if (override_ok) {
9168                                                         auth_keyid = fwd->auth_keyid;
9169                                                         override_ok = 0;
9170                                                 } else if (fwd->auth_keyid != auth_keyid) {
9171                                                         /*
9172                                                          * different keyid,
9173                                                          * so done bundling
9174                                                          */
9175                                                         break;
9176                                                 }
9177                                         }
9178                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9179                                         if (m == NULL) {
9180                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9181                                                 return (ENOMEM);
9182                                         }
9183                                         /* Do clear IP_DF ? */
9184                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9185                                                 no_fragmentflg = 0;
9186                                         }
9187                                         /* upate our MTU size */
9188                                         if (mtu > (fwd->send_size + dmtu))
9189                                                 mtu -= (fwd->send_size + dmtu);
9190                                         else
9191                                                 mtu = 0;
9192                                         data_list[bundle_at++] = fwd;
9193                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9194                                                 break;
9195                                         }
9196                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9197                                 } else {
9198                                         /* can't fit so we are done */
9199                                         break;
9200                                 }
9201                         }
9202                 }
9203                 /* Is there something to send for this destination? */
9204                 if (m) {
9205                         /*
9206                          * No matter if we fail/or suceed we should start a
9207                          * timer. A failure is like a lost IP packet :-)
9208                          */
9209                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9210                                 /*
9211                                  * no timer running on this destination
9212                                  * restart it.
9213                                  */
9214                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9215                                 tmr_started = 1;
9216                         }
9217                         /* Now lets send it, if there is anything to send :> */
9218                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9219                             (struct sockaddr *)&net->ro._l_addr, m,
9220                             auth_offset, auth, auth_keyid,
9221                             no_fragmentflg, 0, NULL, 0,
9222                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9223                             net->port, so_locked, NULL))) {
9224                                 /* error, we could not output */
9225                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9226                                 return (error);
9227                         }
9228                         m = endofchain = NULL;
9229                         auth = NULL;
9230                         auth_offset = 0;
9231                         /* For HB's */
9232                         /*
9233                          * We don't want to mark the net->sent time here
9234                          * since this we use this for HB and retrans cannot
9235                          * measure RTT
9236                          */
9237                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9238
9239                         /* For auto-close */
9240                         cnt_thru++;
9241                         if (*now_filled == 0) {
9242                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9243                                 *now = asoc->time_last_sent;
9244                                 *now_filled = 1;
9245                         } else {
9246                                 asoc->time_last_sent = *now;
9247                         }
9248                         *cnt_out += bundle_at;
9249 #ifdef SCTP_AUDITING_ENABLED
9250                         sctp_audit_log(0xC4, bundle_at);
9251 #endif
9252                         if (bundle_at) {
9253                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9254                         }
9255                         for (i = 0; i < bundle_at; i++) {
9256                                 SCTP_STAT_INCR(sctps_sendretransdata);
9257                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9258                                 /*
9259                                  * When we have a revoked data, and we
9260                                  * retransmit it, then we clear the revoked
9261                                  * flag since this flag dictates if we
9262                                  * subtracted from the fs
9263                                  */
9264                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9265                                         /* Deflate the cwnd */
9266                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9267                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9268                                 }
9269                                 data_list[i]->snd_count++;
9270                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9271                                 /* record the time */
9272                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9273                                 if (data_list[i]->book_size_scale) {
9274                                         /*
9275                                          * need to double the book size on
9276                                          * this one
9277                                          */
9278                                         data_list[i]->book_size_scale = 0;
9279                                         /*
9280                                          * Since we double the booksize, we
9281                                          * must also double the output queue
9282                                          * size, since this get shrunk when
9283                                          * we free by this amount.
9284                                          */
9285                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9286                                         data_list[i]->book_size *= 2;
9287
9288
9289                                 } else {
9290                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9291                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9292                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9293                                         }
9294                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9295                                             (uint32_t) (data_list[i]->send_size +
9296                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9297                                 }
9298                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9299                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9300                                             data_list[i]->whoTo->flight_size,
9301                                             data_list[i]->book_size,
9302                                             (uintptr_t) data_list[i]->whoTo,
9303                                             data_list[i]->rec.data.TSN_seq);
9304                                 }
9305                                 sctp_flight_size_increase(data_list[i]);
9306                                 sctp_total_flight_increase(stcb, data_list[i]);
9307                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9308                                         /* SWS sender side engages */
9309                                         asoc->peers_rwnd = 0;
9310                                 }
9311                                 if ((i == 0) &&
9312                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9313                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9314                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9315                                             (tmr_started == 0)) {
9316                                                 /*-
9317                                                  * ok we just fast-retrans'd
9318                                                  * the lowest TSN, i.e the
9319                                                  * first on the list. In
9320                                                  * this case we want to give
9321                                                  * some more time to get a
9322                                                  * SACK back without a
9323                                                  * t3-expiring.
9324                                                  */
9325                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9326                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9327                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9328                                         }
9329                                 }
9330                         }
9331                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9332                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9333                         }
9334 #ifdef SCTP_AUDITING_ENABLED
9335                         sctp_auditing(21, inp, stcb, NULL);
9336 #endif
9337                 } else {
9338                         /* None will fit */
9339                         return (1);
9340                 }
9341                 if (asoc->sent_queue_retran_cnt <= 0) {
9342                         /* all done we have no more to retran */
9343                         asoc->sent_queue_retran_cnt = 0;
9344                         break;
9345                 }
9346                 if (one_chunk) {
9347                         /* No more room in rwnd */
9348                         return (1);
9349                 }
9350                 /* stop the for loop here. we sent out a packet */
9351                 break;
9352         }
9353         return (0);
9354 }
9355
9356
9357 static int
9358 sctp_timer_validation(struct sctp_inpcb *inp,
9359     struct sctp_tcb *stcb,
9360     struct sctp_association *asoc,
9361     int ret)
9362 {
9363         struct sctp_nets *net;
9364
9365         /* Validate that a timer is running somewhere */
9366         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9367                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9368                         /* Here is a timer */
9369                         return (ret);
9370                 }
9371         }
9372         SCTP_TCB_LOCK_ASSERT(stcb);
9373         /* Gak, we did not have a timer somewhere */
9374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9375         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9376         return (ret);
9377 }
9378
9379 void
9380 sctp_chunk_output(struct sctp_inpcb *inp,
9381     struct sctp_tcb *stcb,
9382     int from_where,
9383     int so_locked
9384 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9385     SCTP_UNUSED
9386 #endif
9387 )
9388 {
9389         /*-
9390          * Ok this is the generic chunk service queue. we must do the
9391          * following:
9392          * - See if there are retransmits pending, if so we must
9393          *   do these first.
9394          * - Service the stream queue that is next, moving any
9395          *   message (note I must get a complete message i.e.
9396          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9397          *   TSN's
9398          * - Check to see if the cwnd/rwnd allows any output, if so we
9399          *   go ahead and fomulate and send the low level chunks. Making sure
9400          *   to combine any control in the control chunk queue also.
9401          */
9402         struct sctp_association *asoc;
9403         struct sctp_nets *net;
9404         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9405             burst_cnt = 0, burst_limit = 0;
9406         struct timeval now;
9407         int now_filled = 0;
9408         int nagle_on = 0;
9409         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9410         int un_sent = 0;
9411         int fr_done, tot_frs = 0;
9412
9413         asoc = &stcb->asoc;
9414         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9415                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9416                         nagle_on = 0;
9417                 } else {
9418                         nagle_on = 1;
9419                 }
9420         }
9421         SCTP_TCB_LOCK_ASSERT(stcb);
9422
9423         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9424
9425         if ((un_sent <= 0) &&
9426             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9427             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9428             (asoc->sent_queue_retran_cnt == 0)) {
9429                 /* Nothing to do unless there is something to be sent left */
9430                 return;
9431         }
9432         /*
9433          * Do we have something to send, data or control AND a sack timer
9434          * running, if so piggy-back the sack.
9435          */
9436         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9437                 sctp_send_sack(stcb);
9438                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9439         }
9440         while (asoc->sent_queue_retran_cnt) {
9441                 /*-
9442                  * Ok, it is retransmission time only, we send out only ONE
9443                  * packet with a single call off to the retran code.
9444                  */
9445                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9446                         /*-
9447                          * Special hook for handling cookiess discarded
9448                          * by peer that carried data. Send cookie-ack only
9449                          * and then the next call with get the retran's.
9450                          */
9451                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9452                             from_where,
9453                             &now, &now_filled, frag_point, so_locked);
9454                         return;
9455                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9456                         /* if its not from a HB then do it */
9457                         fr_done = 0;
9458                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9459                         if (fr_done) {
9460                                 tot_frs++;
9461                         }
9462                 } else {
9463                         /*
9464                          * its from any other place, we don't allow retran
9465                          * output (only control)
9466                          */
9467                         ret = 1;
9468                 }
9469                 if (ret > 0) {
9470                         /* Can't send anymore */
9471                         /*-
9472                          * now lets push out control by calling med-level
9473                          * output once. this assures that we WILL send HB's
9474                          * if queued too.
9475                          */
9476                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9477                             from_where,
9478                             &now, &now_filled, frag_point, so_locked);
9479 #ifdef SCTP_AUDITING_ENABLED
9480                         sctp_auditing(8, inp, stcb, NULL);
9481 #endif
9482                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9483                         return;
9484                 }
9485                 if (ret < 0) {
9486                         /*-
9487                          * The count was off.. retran is not happening so do
9488                          * the normal retransmission.
9489                          */
9490 #ifdef SCTP_AUDITING_ENABLED
9491                         sctp_auditing(9, inp, stcb, NULL);
9492 #endif
9493                         if (ret == SCTP_RETRAN_EXIT) {
9494                                 return;
9495                         }
9496                         break;
9497                 }
9498                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9499                         /* Only one transmission allowed out of a timeout */
9500 #ifdef SCTP_AUDITING_ENABLED
9501                         sctp_auditing(10, inp, stcb, NULL);
9502 #endif
9503                         /* Push out any control */
9504                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9505                             &now, &now_filled, frag_point, so_locked);
9506                         return;
9507                 }
9508                 if (tot_frs > asoc->max_burst) {
9509                         /* Hit FR burst limit */
9510                         return;
9511                 }
9512                 if ((num_out == 0) && (ret == 0)) {
9513
9514                         /* No more retrans to send */
9515                         break;
9516                 }
9517         }
9518 #ifdef SCTP_AUDITING_ENABLED
9519         sctp_auditing(12, inp, stcb, NULL);
9520 #endif
9521         /* Check for bad destinations, if they exist move chunks around. */
9522         burst_limit = asoc->max_burst;
9523         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9524                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9525                     SCTP_ADDR_NOT_REACHABLE) {
9526                         /*-
9527                          * if possible move things off of this address we
9528                          * still may send below due to the dormant state but
9529                          * we try to find an alternate address to send to
9530                          * and if we have one we move all queued data on the
9531                          * out wheel to this alternate address.
9532                          */
9533                         if (net->ref_count > 1)
9534                                 sctp_move_to_an_alt(stcb, asoc, net);
9535                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9536                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9537                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9538                         /*
9539                          * JRS 5/14/07 - If CMT PF is on and the current
9540                          * destination is in PF state, move all queued data
9541                          * to an alternate desination.
9542                          */
9543                         if (net->ref_count > 1)
9544                                 sctp_move_to_an_alt(stcb, asoc, net);
9545                 } else {
9546                         /*-
9547                          * if ((asoc->sat_network) || (net->addr_is_local))
9548                          * { burst_limit = asoc->max_burst *
9549                          * SCTP_SAT_NETWORK_BURST_INCR; }
9550                          */
9551                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9552                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9553                                         /*
9554                                          * JRS - Use the congestion control
9555                                          * given in the congestion control
9556                                          * module
9557                                          */
9558                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9559                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9560                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9561                                         }
9562                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9563                                 }
9564                                 net->fast_retran_ip = 0;
9565                         } else {
9566                                 if (net->flight_size == 0) {
9567                                         /* Should be decaying the cwnd here */
9568                                         ;
9569                                 }
9570                         }
9571                 }
9572
9573         }
9574         burst_cnt = 0;
9575         do {
9576                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9577                     &reason_code, 0, from_where,
9578                     &now, &now_filled, frag_point, so_locked);
9579                 if (error) {
9580                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9581                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9582                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9583                         }
9584                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9585                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9586                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9587                         }
9588                         break;
9589                 }
9590                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9591
9592                 tot_out += num_out;
9593                 burst_cnt++;
9594                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9595                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9596                         if (num_out == 0) {
9597                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9598                         }
9599                 }
9600                 if (nagle_on) {
9601                         /*-
9602                          * When nagle is on, we look at how much is un_sent, then
9603                          * if its smaller than an MTU and we have data in
9604                          * flight we stop.
9605                          */
9606                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9607                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9608                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9609                             (stcb->asoc.total_flight > 0)) {
9610                                 break;
9611                         }
9612                 }
9613                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9614                     TAILQ_EMPTY(&asoc->send_queue) &&
9615                     TAILQ_EMPTY(&asoc->out_wheel)) {
9616                         /* Nothing left to send */
9617                         break;
9618                 }
9619                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9620                         /* Nothing left to send */
9621                         break;
9622                 }
9623         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9624             (burst_cnt < burst_limit)));
9625
9626         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9627                 if (burst_cnt >= burst_limit) {
9628                         SCTP_STAT_INCR(sctps_maxburstqueued);
9629                         asoc->burst_limit_applied = 1;
9630                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9631                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9632                         }
9633                 } else {
9634                         asoc->burst_limit_applied = 0;
9635                 }
9636         }
9637         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9638                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9639         }
9640         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9641             tot_out);
9642
9643         /*-
9644          * Now we need to clean up the control chunk chain if a ECNE is on
9645          * it. It must be marked as UNSENT again so next call will continue
9646          * to send it until such time that we get a CWR, to remove it.
9647          */
9648         if (stcb->asoc.ecn_echo_cnt_onq)
9649                 sctp_fix_ecn_echo(asoc);
9650         return;
9651 }
9652
9653
9654 int
9655 sctp_output(inp, m, addr, control, p, flags)
9656         struct sctp_inpcb *inp;
9657         struct mbuf *m;
9658         struct sockaddr *addr;
9659         struct mbuf *control;
9660         struct thread *p;
9661         int flags;
9662 {
9663         if (inp == NULL) {
9664                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9665                 return (EINVAL);
9666         }
9667         if (inp->sctp_socket == NULL) {
9668                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9669                 return (EINVAL);
9670         }
9671         return (sctp_sosend(inp->sctp_socket,
9672             addr,
9673             (struct uio *)NULL,
9674             m,
9675             control,
9676             flags, p
9677             ));
9678 }
9679
9680 void
9681 send_forward_tsn(struct sctp_tcb *stcb,
9682     struct sctp_association *asoc)
9683 {
9684         struct sctp_tmit_chunk *chk;
9685         struct sctp_forward_tsn_chunk *fwdtsn;
9686         uint32_t advance_peer_ack_point;
9687
9688         SCTP_TCB_LOCK_ASSERT(stcb);
9689         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9690                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9691                         /* mark it to unsent */
9692                         chk->sent = SCTP_DATAGRAM_UNSENT;
9693                         chk->snd_count = 0;
9694                         /* Do we correct its output location? */
9695                         if (chk->whoTo != asoc->primary_destination) {
9696                                 sctp_free_remote_addr(chk->whoTo);
9697                                 chk->whoTo = asoc->primary_destination;
9698                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9699                         }
9700                         goto sctp_fill_in_rest;
9701                 }
9702         }
9703         /* Ok if we reach here we must build one */
9704         sctp_alloc_a_chunk(stcb, chk);
9705         if (chk == NULL) {
9706                 return;
9707         }
9708         chk->copy_by_ref = 0;
9709         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9710         chk->rec.chunk_id.can_take_data = 0;
9711         chk->asoc = asoc;
9712         chk->whoTo = NULL;
9713         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9714         if (chk->data == NULL) {
9715                 sctp_free_a_chunk(stcb, chk);
9716                 return;
9717         }
9718         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9719         chk->sent = SCTP_DATAGRAM_UNSENT;
9720         chk->snd_count = 0;
9721         chk->whoTo = asoc->primary_destination;
9722         atomic_add_int(&chk->whoTo->ref_count, 1);
9723         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9724         asoc->ctrl_queue_cnt++;
9725 sctp_fill_in_rest:
9726         /*-
9727          * Here we go through and fill out the part that deals with
9728          * stream/seq of the ones we skip.
9729          */
9730         SCTP_BUF_LEN(chk->data) = 0;
9731         {
9732                 struct sctp_tmit_chunk *at, *tp1, *last;
9733                 struct sctp_strseq *strseq;
9734                 unsigned int cnt_of_space, i, ovh;
9735                 unsigned int space_needed;
9736                 unsigned int cnt_of_skipped = 0;
9737
9738                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9739                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
9740                             (at->sent != SCTP_DATAGRAM_ACKED)) {
9741                                 /* no more to look at */
9742                                 break;
9743                         }
9744                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9745                                 /* We don't report these */
9746                                 continue;
9747                         }
9748                         cnt_of_skipped++;
9749                 }
9750                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9751                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9752
9753                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9754
9755                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9756                         ovh = SCTP_MIN_OVERHEAD;
9757                 } else {
9758                         ovh = SCTP_MIN_V4_OVERHEAD;
9759                 }
9760                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9761                         /* trim to a mtu size */
9762                         cnt_of_space = asoc->smallest_mtu - ovh;
9763                 }
9764                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9765                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9766                             0xff, 0, cnt_of_skipped,
9767                             asoc->advanced_peer_ack_point);
9768
9769                 }
9770                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9771                 if (cnt_of_space < space_needed) {
9772                         /*-
9773                          * ok we must trim down the chunk by lowering the
9774                          * advance peer ack point.
9775                          */
9776                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9777                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9778                                     0xff, 0xff, cnt_of_space,
9779                                     space_needed);
9780                         }
9781                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9782                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9783                         /*-
9784                          * Go through and find the TSN that will be the one
9785                          * we report.
9786                          */
9787                         at = TAILQ_FIRST(&asoc->sent_queue);
9788                         for (i = 0; i < cnt_of_skipped; i++) {
9789                                 tp1 = TAILQ_NEXT(at, sctp_next);
9790                                 at = tp1;
9791                         }
9792                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9793                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9794                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9795                                     asoc->advanced_peer_ack_point);
9796                         }
9797                         last = at;
9798                         /*-
9799                          * last now points to last one I can report, update
9800                          * peer ack point
9801                          */
9802                         advance_peer_ack_point = last->rec.data.TSN_seq;
9803                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9804                 }
9805                 chk->send_size = space_needed;
9806                 /* Setup the chunk */
9807                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9808                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9809                 fwdtsn->ch.chunk_flags = 0;
9810                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9811                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9812                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9813                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9814                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9815                 fwdtsn++;
9816                 /*-
9817                  * Move pointer to after the fwdtsn and transfer to the
9818                  * strseq pointer.
9819                  */
9820                 strseq = (struct sctp_strseq *)fwdtsn;
9821                 /*-
9822                  * Now populate the strseq list. This is done blindly
9823                  * without pulling out duplicate stream info. This is
9824                  * inefficent but won't harm the process since the peer will
9825                  * look at these in sequence and will thus release anything.
9826                  * It could mean we exceed the PMTU and chop off some that
9827                  * we could have included.. but this is unlikely (aka 1432/4
9828                  * would mean 300+ stream seq's would have to be reported in
9829                  * one FWD-TSN. With a bit of work we can later FIX this to
9830                  * optimize and pull out duplcates.. but it does add more
9831                  * overhead. So for now... not!
9832                  */
9833                 at = TAILQ_FIRST(&asoc->sent_queue);
9834                 for (i = 0; i < cnt_of_skipped; i++) {
9835                         tp1 = TAILQ_NEXT(at, sctp_next);
9836                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9837                                 /* We don't report these */
9838                                 i--;
9839                                 at = tp1;
9840                                 continue;
9841                         }
9842                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9843                                 at->rec.data.fwd_tsn_cnt = 0;
9844                         }
9845                         strseq->stream = ntohs(at->rec.data.stream_number);
9846                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9847                         strseq++;
9848                         at = tp1;
9849                 }
9850         }
9851         return;
9852
9853 }
9854
9855 void
9856 sctp_send_sack(struct sctp_tcb *stcb)
9857 {
9858         /*-
9859          * Queue up a SACK or NR-SACK in the control queue.
9860          * We must first check to see if a SACK or NR-SACK is
9861          * somehow on the control queue.
9862          * If so, we will take and and remove the old one.
9863          */
9864         struct sctp_association *asoc;
9865         struct sctp_tmit_chunk *chk, *a_chk;
9866         struct sctp_sack_chunk *sack;
9867         struct sctp_nr_sack_chunk *nr_sack;
9868         struct sctp_gap_ack_block *gap_descriptor;
9869         struct sack_track *selector;
9870         int mergeable = 0;
9871         int offset;
9872         caddr_t limit;
9873         uint32_t *dup;
9874         int limit_reached = 0;
9875         unsigned int i, sel_start, siz, j, starting_index;
9876         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9877         int num_dups = 0;
9878         int space_req;
9879         uint32_t highest_tsn;
9880         uint8_t flags;
9881         uint8_t type;
9882
9883         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) &&
9884             stcb->asoc.peer_supports_nr_sack) {
9885                 type = SCTP_NR_SELECTIVE_ACK;
9886         } else {
9887                 type = SCTP_SELECTIVE_ACK;
9888         }
9889         a_chk = NULL;
9890         asoc = &stcb->asoc;
9891         SCTP_TCB_LOCK_ASSERT(stcb);
9892         if (asoc->last_data_chunk_from == NULL) {
9893                 /* Hmm we never received anything */
9894                 return;
9895         }
9896         sctp_slide_mapping_arrays(stcb);
9897         sctp_set_rwnd(stcb, asoc);
9898         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9899                 if (chk->rec.chunk_id.id == type) {
9900                         /* Hmm, found a sack already on queue, remove it */
9901                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9902                         asoc->ctrl_queue_cnt++;
9903                         a_chk = chk;
9904                         if (a_chk->data) {
9905                                 sctp_m_freem(a_chk->data);
9906                                 a_chk->data = NULL;
9907                         }
9908                         sctp_free_remote_addr(a_chk->whoTo);
9909                         a_chk->whoTo = NULL;
9910                         break;
9911                 }
9912         }
9913         if (a_chk == NULL) {
9914                 sctp_alloc_a_chunk(stcb, a_chk);
9915                 if (a_chk == NULL) {
9916                         /* No memory so we drop the idea, and set a timer */
9917                         if (stcb->asoc.delayed_ack) {
9918                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9919                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9920                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9921                                     stcb->sctp_ep, stcb, NULL);
9922                         } else {
9923                                 stcb->asoc.send_sack = 1;
9924                         }
9925                         return;
9926                 }
9927                 a_chk->copy_by_ref = 0;
9928                 a_chk->rec.chunk_id.id = type;
9929                 a_chk->rec.chunk_id.can_take_data = 1;
9930         }
9931         /* Clear our pkt counts */
9932         asoc->data_pkts_seen = 0;
9933
9934         a_chk->asoc = asoc;
9935         a_chk->snd_count = 0;
9936         a_chk->send_size = 0;   /* fill in later */
9937         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9938         a_chk->whoTo = NULL;
9939
9940         if ((asoc->numduptsns) ||
9941             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9942             ) {
9943                 /*-
9944                  * Ok, we have some duplicates or the destination for the
9945                  * sack is unreachable, lets see if we can select an
9946                  * alternate than asoc->last_data_chunk_from
9947                  */
9948                 if ((!(asoc->last_data_chunk_from->dest_state &
9949                     SCTP_ADDR_NOT_REACHABLE)) &&
9950                     (asoc->used_alt_onsack > asoc->numnets)) {
9951                         /* We used an alt last time, don't this time */
9952                         a_chk->whoTo = NULL;
9953                 } else {
9954                         asoc->used_alt_onsack++;
9955                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9956                 }
9957                 if (a_chk->whoTo == NULL) {
9958                         /* Nope, no alternate */
9959                         a_chk->whoTo = asoc->last_data_chunk_from;
9960                         asoc->used_alt_onsack = 0;
9961                 }
9962         } else {
9963                 /*
9964                  * No duplicates so we use the last place we received data
9965                  * from.
9966                  */
9967                 asoc->used_alt_onsack = 0;
9968                 a_chk->whoTo = asoc->last_data_chunk_from;
9969         }
9970         if (a_chk->whoTo) {
9971                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9972         }
9973         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map, MAX_TSN)) {
9974                 highest_tsn = asoc->highest_tsn_inside_map;
9975         } else {
9976                 highest_tsn = asoc->highest_tsn_inside_nr_map;
9977         }
9978         if (highest_tsn == asoc->cumulative_tsn) {
9979                 /* no gaps */
9980                 if (type == SCTP_SELECTIVE_ACK) {
9981                         space_req = sizeof(struct sctp_sack_chunk);
9982                 } else {
9983                         space_req = sizeof(struct sctp_nr_sack_chunk);
9984                 }
9985         } else {
9986                 /* gaps get a cluster */
9987                 space_req = MCLBYTES;
9988         }
9989         /* Ok now lets formulate a MBUF with our sack */
9990         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9991         if ((a_chk->data == NULL) ||
9992             (a_chk->whoTo == NULL)) {
9993                 /* rats, no mbuf memory */
9994                 if (a_chk->data) {
9995                         /* was a problem with the destination */
9996                         sctp_m_freem(a_chk->data);
9997                         a_chk->data = NULL;
9998                 }
9999                 sctp_free_a_chunk(stcb, a_chk);
10000                 /* sa_ignore NO_NULL_CHK */
10001                 if (stcb->asoc.delayed_ack) {
10002                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10003                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10004                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10005                             stcb->sctp_ep, stcb, NULL);
10006                 } else {
10007                         stcb->asoc.send_sack = 1;
10008                 }
10009                 return;
10010         }
10011         /* ok, lets go through and fill it in */
10012         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10013         space = M_TRAILINGSPACE(a_chk->data);
10014         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10015                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10016         }
10017         limit = mtod(a_chk->data, caddr_t);
10018         limit += space;
10019
10020         /* 0x01 is used by nonce for ecn */
10021         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10022             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10023             (asoc->peer_supports_ecn_nonce))
10024                 flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10025         else
10026                 flags = 0;
10027
10028         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10029                 /*-
10030                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10031                  * received, then set high bit to 1, else 0. Reset
10032                  * pkts_rcvd.
10033                  */
10034                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10035                 asoc->cmt_dac_pkts_rcvd = 0;
10036         }
10037 #ifdef SCTP_ASOCLOG_OF_TSNS
10038         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10039         stcb->asoc.cumack_log_atsnt++;
10040         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10041                 stcb->asoc.cumack_log_atsnt = 0;
10042         }
10043 #endif
10044         /* reset the readers interpretation */
10045         stcb->freed_by_sorcv_sincelast = 0;
10046
10047         if (type == SCTP_SELECTIVE_ACK) {
10048                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10049                 nr_sack = NULL;
10050                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10051                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10052                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10053                 } else {
10054                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10055                 }
10056         } else {
10057                 sack = NULL;
10058                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10059                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10060                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10061                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10062                 } else {
10063                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10064                 }
10065         }
10066
10067         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10068                 offset = 1;
10069                 /*-
10070                  * The base TSN is intialized to be the first TSN the peer
10071                  * will send us. If the cum-ack is behind this then when they
10072                  * send us the next in sequence it will mark the base_tsn bit.
10073                  * Thus we need to use the very first selector and the offset
10074                  * is 1. Our table is built for this case.
10075                  */
10076                 starting_index = 0;
10077                 sel_start = 0;
10078         } else {
10079                 /*-
10080                  * we skip the first selector  when the cum-ack is at or above the
10081                  * mapping array base. This is because the bits at the base or above
10082                  * are turned on and our first selector in the table assumes they are
10083                  * off. We thus will use the second selector (first is 0). We use
10084                  * the reverse of our macro to fix the offset, in bits, that our
10085                  * table is at. Note that this method assumes that the cum-tsn is
10086                  * within the first bit, i.e. its value is 0-7 which means the
10087                  * result to our offset will be either a 0 - -7. If the cumack
10088                  * is NOT in the first byte (0) (which it should be since we did
10089                  * a mapping array slide above) then we need to calculate the starting
10090                  * index i.e. which byte of the mapping array we should start at. We
10091                  * do this by dividing by 8 and pushing the remainder (mod) into offset.
10092                  * then we multiply the offset to be negative, since we need a negative
10093                  * offset into the selector table.
10094                  */
10095                 SCTP_CALC_TSN_TO_GAP(offset, asoc->cumulative_tsn, asoc->mapping_array_base_tsn);
10096                 if (offset > 7) {
10097                         starting_index = offset / 8;
10098                         offset = offset % 8;
10099                         printf("Strange starting index is %d offset:%d (not 0/x)\n",
10100                             starting_index, offset);
10101                 } else {
10102                         starting_index = 0;
10103                 }
10104                 /* We need a negative offset in our table */
10105                 offset *= -1;
10106                 sel_start = 1;
10107         }
10108         if (((type == SCTP_SELECTIVE_ACK) &&
10109             compare_with_wrap(highest_tsn, asoc->cumulative_tsn, MAX_TSN)) ||
10110             ((type == SCTP_NR_SELECTIVE_ACK) &&
10111             compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN))) {
10112                 /* we have a gap .. maybe */
10113                 for (i = starting_index; i < siz; i++) {
10114                         if (type == SCTP_SELECTIVE_ACK) {
10115                                 selector = &sack_array[asoc->mapping_array[i] | asoc->nr_mapping_array[i]];
10116                         } else {
10117                                 selector = &sack_array[asoc->mapping_array[i]];
10118                         }
10119                         if (mergeable && selector->right_edge) {
10120                                 /*
10121                                  * Backup, left and right edges were ok to
10122                                  * merge.
10123                                  */
10124                                 num_gap_blocks--;
10125                                 gap_descriptor--;
10126                         }
10127                         if (selector->num_entries == 0)
10128                                 mergeable = 0;
10129                         else {
10130                                 for (j = sel_start; j < selector->num_entries; j++) {
10131                                         if (mergeable && selector->right_edge) {
10132                                                 /*
10133                                                  * do a merge by NOT setting
10134                                                  * the left side
10135                                                  */
10136                                                 mergeable = 0;
10137                                         } else {
10138                                                 /*
10139                                                  * no merge, set the left
10140                                                  * side
10141                                                  */
10142                                                 mergeable = 0;
10143                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10144                                         }
10145                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10146                                         num_gap_blocks++;
10147                                         gap_descriptor++;
10148                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10149                                                 /* no more room */
10150                                                 limit_reached = 1;
10151                                                 break;
10152                                         }
10153                                 }
10154                                 if (selector->left_edge) {
10155                                         mergeable = 1;
10156                                 }
10157                         }
10158                         if (limit_reached) {
10159                                 /* Reached the limit stop */
10160                                 break;
10161                         }
10162                         sel_start = 0;
10163                         offset += 8;
10164                 }
10165         }
10166         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10167             (limit_reached == 0)) {
10168
10169                 mergeable = 0;
10170
10171                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn)
10172                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10173                 else
10174                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10175
10176                 if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10177                         offset = 1;
10178                         /*-
10179                         * cum-ack behind the mapping array, so we start and use all
10180                         * entries.
10181                         */
10182                         sel_start = 0;
10183                 } else {
10184                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10185                         /*-
10186                         * we skip the first one when the cum-ack is at or above the
10187                         * mapping array base. Note this only works if
10188                         */
10189                         sel_start = 1;
10190                 }
10191                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10192                         /* we have a gap .. maybe */
10193                         for (i = 0; i < siz; i++) {
10194                                 selector = &sack_array[asoc->nr_mapping_array[i]];
10195                                 if (mergeable && selector->right_edge) {
10196                                         /*
10197                                          * Backup, left and right edges were
10198                                          * ok to merge.
10199                                          */
10200                                         num_nr_gap_blocks--;
10201                                         gap_descriptor--;
10202                                 }
10203                                 if (selector->num_entries == 0)
10204                                         mergeable = 0;
10205                                 else {
10206                                         for (j = sel_start; j < selector->num_entries; j++) {
10207                                                 if (mergeable && selector->right_edge) {
10208                                                         /*
10209                                                          * do a merge by NOT
10210                                                          * setting the left
10211                                                          * side
10212                                                          */
10213                                                         mergeable = 0;
10214                                                 } else {
10215                                                         /*
10216                                                          * no merge, set the
10217                                                          * left side
10218                                                          */
10219                                                         mergeable = 0;
10220                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10221                                                 }
10222                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10223                                                 num_nr_gap_blocks++;
10224                                                 gap_descriptor++;
10225                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10226                                                         /* no more room */
10227                                                         limit_reached = 1;
10228                                                         break;
10229                                                 }
10230                                         }
10231                                         if (selector->left_edge) {
10232                                                 mergeable = 1;
10233                                         }
10234                                 }
10235                                 if (limit_reached) {
10236                                         /* Reached the limit stop */
10237                                         break;
10238                                 }
10239                                 sel_start = 0;
10240                                 offset += 8;
10241                         }
10242                 }
10243         }
10244         /* now we must add any dups we are going to report. */
10245         if ((limit_reached == 0) && (asoc->numduptsns)) {
10246                 dup = (uint32_t *) gap_descriptor;
10247                 for (i = 0; i < asoc->numduptsns; i++) {
10248                         *dup = htonl(asoc->dup_tsns[i]);
10249                         dup++;
10250                         num_dups++;
10251                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10252                                 /* no more room */
10253                                 break;
10254                         }
10255                 }
10256                 asoc->numduptsns = 0;
10257         }
10258         /*
10259          * now that the chunk is prepared queue it to the control chunk
10260          * queue.
10261          */
10262         if (type == SCTP_SELECTIVE_ACK) {
10263                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10264                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10265                     num_dups * sizeof(int32_t);
10266                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10267                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10268                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10269                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10270                 sack->sack.num_dup_tsns = htons(num_dups);
10271                 sack->ch.chunk_type = type;
10272                 sack->ch.chunk_flags = flags;
10273                 sack->ch.chunk_length = htons(a_chk->send_size);
10274         } else {
10275                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10276                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10277                     num_dups * sizeof(int32_t);
10278                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10279                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10280                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10281                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10282                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10283                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10284                 nr_sack->nr_sack.reserved = 0;
10285                 nr_sack->ch.chunk_type = type;
10286                 nr_sack->ch.chunk_flags = flags;
10287                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10288         }
10289         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10290         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10291         asoc->ctrl_queue_cnt++;
10292         asoc->send_sack = 0;
10293         SCTP_STAT_INCR(sctps_sendsacks);
10294         return;
10295 }
10296
10297 void
10298 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10299 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10300     SCTP_UNUSED
10301 #endif
10302 )
10303 {
10304         struct mbuf *m_abort;
10305         struct mbuf *m_out = NULL, *m_end = NULL;
10306         struct sctp_abort_chunk *abort = NULL;
10307         int sz;
10308         uint32_t auth_offset = 0;
10309         struct sctp_auth_chunk *auth = NULL;
10310
10311         /*-
10312          * Add an AUTH chunk, if chunk requires it and save the offset into
10313          * the chain for AUTH
10314          */
10315         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10316             stcb->asoc.peer_auth_chunks)) {
10317                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10318                     stcb, SCTP_ABORT_ASSOCIATION);
10319                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10320         }
10321         SCTP_TCB_LOCK_ASSERT(stcb);
10322         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10323         if (m_abort == NULL) {
10324                 /* no mbuf's */
10325                 if (m_out)
10326                         sctp_m_freem(m_out);
10327                 return;
10328         }
10329         /* link in any error */
10330         SCTP_BUF_NEXT(m_abort) = operr;
10331         sz = 0;
10332         if (operr) {
10333                 struct mbuf *n;
10334
10335                 n = operr;
10336                 while (n) {
10337                         sz += SCTP_BUF_LEN(n);
10338                         n = SCTP_BUF_NEXT(n);
10339                 }
10340         }
10341         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10342         if (m_out == NULL) {
10343                 /* NO Auth chunk prepended, so reserve space in front */
10344                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10345                 m_out = m_abort;
10346         } else {
10347                 /* Put AUTH chunk at the front of the chain */
10348                 SCTP_BUF_NEXT(m_end) = m_abort;
10349         }
10350
10351         /* fill in the ABORT chunk */
10352         abort = mtod(m_abort, struct sctp_abort_chunk *);
10353         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10354         abort->ch.chunk_flags = 0;
10355         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10356
10357         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10358             stcb->asoc.primary_destination,
10359             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10360             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10361             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10362             stcb->asoc.primary_destination->port, so_locked, NULL);
10363         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10364 }
10365
10366 void
10367 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10368     struct sctp_nets *net,
10369     int reflect_vtag)
10370 {
10371         /* formulate and SEND a SHUTDOWN-COMPLETE */
10372         struct mbuf *m_shutdown_comp;
10373         struct sctp_shutdown_complete_chunk *shutdown_complete;
10374         uint32_t vtag;
10375         uint8_t flags;
10376
10377         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10378         if (m_shutdown_comp == NULL) {
10379                 /* no mbuf's */
10380                 return;
10381         }
10382         if (reflect_vtag) {
10383                 flags = SCTP_HAD_NO_TCB;
10384                 vtag = stcb->asoc.my_vtag;
10385         } else {
10386                 flags = 0;
10387                 vtag = stcb->asoc.peer_vtag;
10388         }
10389         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10390         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10391         shutdown_complete->ch.chunk_flags = flags;
10392         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10393         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10394         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10395             (struct sockaddr *)&net->ro._l_addr,
10396             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10397             stcb->sctp_ep->sctp_lport, stcb->rport,
10398             htonl(vtag),
10399             net->port, SCTP_SO_NOT_LOCKED, NULL);
10400         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10401         return;
10402 }
10403
10404 void
10405 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10406     uint32_t vrf_id, uint16_t port)
10407 {
10408         /* formulate and SEND a SHUTDOWN-COMPLETE */
10409         struct mbuf *o_pak;
10410         struct mbuf *mout;
10411         struct ip *iph, *iph_out;
10412         struct udphdr *udp = NULL;
10413
10414 #ifdef INET6
10415         struct ip6_hdr *ip6, *ip6_out;
10416
10417 #endif
10418         int offset_out, len, mlen;
10419         struct sctp_shutdown_complete_msg *comp_cp;
10420
10421         iph = mtod(m, struct ip *);
10422         switch (iph->ip_v) {
10423         case IPVERSION:
10424                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10425                 break;
10426 #ifdef INET6
10427         case IPV6_VERSION >> 4:
10428                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10429                 break;
10430 #endif
10431         default:
10432                 return;
10433         }
10434         if (port) {
10435                 len += sizeof(struct udphdr);
10436         }
10437         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10438         if (mout == NULL) {
10439                 return;
10440         }
10441         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10442         SCTP_BUF_LEN(mout) = len;
10443         SCTP_BUF_NEXT(mout) = NULL;
10444         iph_out = NULL;
10445 #ifdef INET6
10446         ip6_out = NULL;
10447 #endif
10448         offset_out = 0;
10449
10450         switch (iph->ip_v) {
10451         case IPVERSION:
10452                 iph_out = mtod(mout, struct ip *);
10453
10454                 /* Fill in the IP header for the ABORT */
10455                 iph_out->ip_v = IPVERSION;
10456                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10457                 iph_out->ip_tos = (u_char)0;
10458                 iph_out->ip_id = 0;
10459                 iph_out->ip_off = 0;
10460                 iph_out->ip_ttl = MAXTTL;
10461                 if (port) {
10462                         iph_out->ip_p = IPPROTO_UDP;
10463                 } else {
10464                         iph_out->ip_p = IPPROTO_SCTP;
10465                 }
10466                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10467                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10468
10469                 /* let IP layer calculate this */
10470                 iph_out->ip_sum = 0;
10471                 offset_out += sizeof(*iph_out);
10472                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10473                     (caddr_t)iph_out + offset_out);
10474                 break;
10475 #ifdef INET6
10476         case IPV6_VERSION >> 4:
10477                 ip6 = (struct ip6_hdr *)iph;
10478                 ip6_out = mtod(mout, struct ip6_hdr *);
10479
10480                 /* Fill in the IPv6 header for the ABORT */
10481                 ip6_out->ip6_flow = ip6->ip6_flow;
10482                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10483                 if (port) {
10484                         ip6_out->ip6_nxt = IPPROTO_UDP;
10485                 } else {
10486                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10487                 }
10488                 ip6_out->ip6_src = ip6->ip6_dst;
10489                 ip6_out->ip6_dst = ip6->ip6_src;
10490                 /*
10491                  * ?? The old code had both the iph len + payload, I think
10492                  * this is wrong and would never have worked
10493                  */
10494                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10495                 offset_out += sizeof(*ip6_out);
10496                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10497                     (caddr_t)ip6_out + offset_out);
10498                 break;
10499 #endif                          /* INET6 */
10500         default:
10501                 /* Currently not supported. */
10502                 sctp_m_freem(mout);
10503                 return;
10504         }
10505         if (port) {
10506                 udp = (struct udphdr *)comp_cp;
10507                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10508                 udp->uh_dport = port;
10509                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10510                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10511                 offset_out += sizeof(struct udphdr);
10512                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10513         }
10514         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10515                 /* no mbuf's */
10516                 sctp_m_freem(mout);
10517                 return;
10518         }
10519         /* Now copy in and fill in the ABORT tags etc. */
10520         comp_cp->sh.src_port = sh->dest_port;
10521         comp_cp->sh.dest_port = sh->src_port;
10522         comp_cp->sh.checksum = 0;
10523         comp_cp->sh.v_tag = sh->v_tag;
10524         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10525         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10526         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10527
10528         if (iph_out != NULL) {
10529                 sctp_route_t ro;
10530                 int ret;
10531                 struct sctp_tcb *stcb = NULL;
10532
10533                 mlen = SCTP_BUF_LEN(mout);
10534                 bzero(&ro, sizeof ro);
10535                 /* set IPv4 length */
10536                 iph_out->ip_len = mlen;
10537 #ifdef  SCTP_PACKET_LOGGING
10538                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10539                         sctp_packet_log(mout, mlen);
10540 #endif
10541                 if (port) {
10542                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10543                         SCTP_STAT_INCR(sctps_sendswcrc);
10544                         SCTP_ENABLE_UDP_CSUM(mout);
10545                 } else {
10546                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10547                         mout->m_pkthdr.csum_data = 0;
10548                         SCTP_STAT_INCR(sctps_sendhwcrc);
10549                 }
10550                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10551                 /* out it goes */
10552                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10553
10554                 /* Free the route if we got one back */
10555                 if (ro.ro_rt)
10556                         RTFREE(ro.ro_rt);
10557         }
10558 #ifdef INET6
10559         if (ip6_out != NULL) {
10560                 struct route_in6 ro;
10561                 int ret;
10562                 struct sctp_tcb *stcb = NULL;
10563                 struct ifnet *ifp = NULL;
10564
10565                 bzero(&ro, sizeof(ro));
10566                 mlen = SCTP_BUF_LEN(mout);
10567 #ifdef  SCTP_PACKET_LOGGING
10568                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10569                         sctp_packet_log(mout, mlen);
10570 #endif
10571                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10572                 if (port) {
10573                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
10574                             (stcb) &&
10575                             (stcb->asoc.loopback_scope))) {
10576                                 comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10577                                 SCTP_STAT_INCR(sctps_sendswcrc);
10578                         } else {
10579                                 SCTP_STAT_INCR(sctps_sendnocrc);
10580                         }
10581                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10582                                 udp->uh_sum = 0xffff;
10583                         }
10584                 } else {
10585                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
10586                             (stcb) &&
10587                             (stcb->asoc.loopback_scope))) {
10588                                 mout->m_pkthdr.csum_flags = CSUM_SCTP;
10589                                 mout->m_pkthdr.csum_data = 0;
10590                                 SCTP_STAT_INCR(sctps_sendhwcrc);
10591                         } else {
10592                                 SCTP_STAT_INCR(sctps_sendnocrc);
10593                         }
10594                 }
10595                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10596
10597                 /* Free the route if we got one back */
10598                 if (ro.ro_rt)
10599                         RTFREE(ro.ro_rt);
10600         }
10601 #endif
10602         SCTP_STAT_INCR(sctps_sendpackets);
10603         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10604         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10605         return;
10606
10607 }
10608
10609 static struct sctp_nets *
10610 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10611 {
10612         struct sctp_nets *net, *hnet;
10613         int ms_goneby, highest_ms, state_overide = 0;
10614
10615         (void)SCTP_GETTIME_TIMEVAL(now);
10616         highest_ms = 0;
10617         hnet = NULL;
10618         SCTP_TCB_LOCK_ASSERT(stcb);
10619         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10620                 if (
10621                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10622                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10623                     ) {
10624                         /*
10625                          * Skip this guy from consideration if HB is off AND
10626                          * its confirmed
10627                          */
10628                         continue;
10629                 }
10630                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10631                         /* skip this dest net from consideration */
10632                         continue;
10633                 }
10634                 if (net->last_sent_time.tv_sec) {
10635                         /* Sent to so we subtract */
10636                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10637                 } else
10638                         /* Never been sent to */
10639                         ms_goneby = 0x7fffffff;
10640                 /*-
10641                  * When the address state is unconfirmed but still
10642                  * considered reachable, we HB at a higher rate. Once it
10643                  * goes confirmed OR reaches the "unreachable" state, thenw
10644                  * we cut it back to HB at a more normal pace.
10645                  */
10646                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10647                         state_overide = 1;
10648                 } else {
10649                         state_overide = 0;
10650                 }
10651
10652                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10653                     (ms_goneby > highest_ms)) {
10654                         highest_ms = ms_goneby;
10655                         hnet = net;
10656                 }
10657         }
10658         if (hnet &&
10659             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10660                 state_overide = 1;
10661         } else {
10662                 state_overide = 0;
10663         }
10664
10665         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10666                 /*-
10667                  * Found the one with longest delay bounds OR it is
10668                  * unconfirmed and still not marked unreachable.
10669                  */
10670                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10671 #ifdef SCTP_DEBUG
10672                 if (hnet) {
10673                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10674                             (struct sockaddr *)&hnet->ro._l_addr);
10675                 } else {
10676                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10677                 }
10678 #endif
10679                 /* update the timer now */
10680                 hnet->last_sent_time = *now;
10681                 return (hnet);
10682         }
10683         /* Nothing to HB */
10684         return (NULL);
10685 }
10686
10687 int
10688 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10689 {
10690         struct sctp_tmit_chunk *chk;
10691         struct sctp_nets *net;
10692         struct sctp_heartbeat_chunk *hb;
10693         struct timeval now;
10694         struct sockaddr_in *sin;
10695         struct sockaddr_in6 *sin6;
10696
10697         SCTP_TCB_LOCK_ASSERT(stcb);
10698         if (user_req == 0) {
10699                 net = sctp_select_hb_destination(stcb, &now);
10700                 if (net == NULL) {
10701                         /*-
10702                          * All our busy none to send to, just start the
10703                          * timer again.
10704                          */
10705                         if (stcb->asoc.state == 0) {
10706                                 return (0);
10707                         }
10708                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10709                             stcb->sctp_ep,
10710                             stcb,
10711                             net);
10712                         return (0);
10713                 }
10714         } else {
10715                 net = u_net;
10716                 if (net == NULL) {
10717                         return (0);
10718                 }
10719                 (void)SCTP_GETTIME_TIMEVAL(&now);
10720         }
10721         sin = (struct sockaddr_in *)&net->ro._l_addr;
10722         if (sin->sin_family != AF_INET) {
10723                 if (sin->sin_family != AF_INET6) {
10724                         /* huh */
10725                         return (0);
10726                 }
10727         }
10728         sctp_alloc_a_chunk(stcb, chk);
10729         if (chk == NULL) {
10730                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10731                 return (0);
10732         }
10733         chk->copy_by_ref = 0;
10734         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10735         chk->rec.chunk_id.can_take_data = 1;
10736         chk->asoc = &stcb->asoc;
10737         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10738
10739         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10740         if (chk->data == NULL) {
10741                 sctp_free_a_chunk(stcb, chk);
10742                 return (0);
10743         }
10744         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10745         SCTP_BUF_LEN(chk->data) = chk->send_size;
10746         chk->sent = SCTP_DATAGRAM_UNSENT;
10747         chk->snd_count = 0;
10748         chk->whoTo = net;
10749         atomic_add_int(&chk->whoTo->ref_count, 1);
10750         /* Now we have a mbuf that we can fill in with the details */
10751         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10752         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10753         /* fill out chunk header */
10754         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10755         hb->ch.chunk_flags = 0;
10756         hb->ch.chunk_length = htons(chk->send_size);
10757         /* Fill out hb parameter */
10758         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10759         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10760         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10761         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10762         /* Did our user request this one, put it in */
10763         hb->heartbeat.hb_info.user_req = user_req;
10764         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10765         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10766         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10767                 /*
10768                  * we only take from the entropy pool if the address is not
10769                  * confirmed.
10770                  */
10771                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10772                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10773         } else {
10774                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10775                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10776         }
10777         if (sin->sin_family == AF_INET) {
10778                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10779         } else if (sin->sin_family == AF_INET6) {
10780                 /* We leave the scope the way it is in our lookup table. */
10781                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10782                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10783         } else {
10784                 /* huh compiler bug */
10785                 return (0);
10786         }
10787
10788         /*
10789          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10790          * PF-heartbeats.  Because of this, threshold management is done by
10791          * the t3 timer handler, and does not need to be done upon the send
10792          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10793          * heartbeat is being sent is in PF state, do NOT do threshold
10794          * management.
10795          */
10796         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10797                 /* ok we have a destination that needs a beat */
10798                 /* lets do the theshold management Qiaobing style */
10799                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10800                     stcb->asoc.max_send_times)) {
10801                         /*-
10802                          * we have lost the association, in a way this is
10803                          * quite bad since we really are one less time since
10804                          * we really did not send yet. This is the down side
10805                          * to the Q's style as defined in the RFC and not my
10806                          * alternate style defined in the RFC.
10807                          */
10808                         if (chk->data != NULL) {
10809                                 sctp_m_freem(chk->data);
10810                                 chk->data = NULL;
10811                         }
10812                         /*
10813                          * Here we do NOT use the macro since the
10814                          * association is now gone.
10815                          */
10816                         if (chk->whoTo) {
10817                                 sctp_free_remote_addr(chk->whoTo);
10818                                 chk->whoTo = NULL;
10819                         }
10820                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10821                         return (-1);
10822                 }
10823         }
10824         net->hb_responded = 0;
10825         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10826         stcb->asoc.ctrl_queue_cnt++;
10827         SCTP_STAT_INCR(sctps_sendheartbeat);
10828         /*-
10829          * Call directly med level routine to put out the chunk. It will
10830          * always tumble out control chunks aka HB but it may even tumble
10831          * out data too.
10832          */
10833         return (1);
10834 }
10835
10836 void
10837 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10838     uint32_t high_tsn)
10839 {
10840         struct sctp_association *asoc;
10841         struct sctp_ecne_chunk *ecne;
10842         struct sctp_tmit_chunk *chk;
10843
10844         asoc = &stcb->asoc;
10845         SCTP_TCB_LOCK_ASSERT(stcb);
10846         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10847                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10848                         /* found a previous ECN_ECHO update it if needed */
10849                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10850                         ecne->tsn = htonl(high_tsn);
10851                         return;
10852                 }
10853         }
10854         /* nope could not find one to update so we must build one */
10855         sctp_alloc_a_chunk(stcb, chk);
10856         if (chk == NULL) {
10857                 return;
10858         }
10859         chk->copy_by_ref = 0;
10860         SCTP_STAT_INCR(sctps_sendecne);
10861         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10862         chk->rec.chunk_id.can_take_data = 0;
10863         chk->asoc = &stcb->asoc;
10864         chk->send_size = sizeof(struct sctp_ecne_chunk);
10865         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10866         if (chk->data == NULL) {
10867                 sctp_free_a_chunk(stcb, chk);
10868                 return;
10869         }
10870         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10871         SCTP_BUF_LEN(chk->data) = chk->send_size;
10872         chk->sent = SCTP_DATAGRAM_UNSENT;
10873         chk->snd_count = 0;
10874         chk->whoTo = net;
10875         atomic_add_int(&chk->whoTo->ref_count, 1);
10876         stcb->asoc.ecn_echo_cnt_onq++;
10877         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10878         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10879         ecne->ch.chunk_flags = 0;
10880         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10881         ecne->tsn = htonl(high_tsn);
10882         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10883         asoc->ctrl_queue_cnt++;
10884 }
10885
10886 void
10887 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10888     struct mbuf *m, int iphlen, int bad_crc)
10889 {
10890         struct sctp_association *asoc;
10891         struct sctp_pktdrop_chunk *drp;
10892         struct sctp_tmit_chunk *chk;
10893         uint8_t *datap;
10894         int len;
10895         int was_trunc = 0;
10896         struct ip *iph;
10897
10898 #ifdef INET6
10899         struct ip6_hdr *ip6h;
10900
10901 #endif
10902         int fullsz = 0, extra = 0;
10903         long spc;
10904         int offset;
10905         struct sctp_chunkhdr *ch, chunk_buf;
10906         unsigned int chk_length;
10907
10908         if (!stcb) {
10909                 return;
10910         }
10911         asoc = &stcb->asoc;
10912         SCTP_TCB_LOCK_ASSERT(stcb);
10913         if (asoc->peer_supports_pktdrop == 0) {
10914                 /*-
10915                  * peer must declare support before I send one.
10916                  */
10917                 return;
10918         }
10919         if (stcb->sctp_socket == NULL) {
10920                 return;
10921         }
10922         sctp_alloc_a_chunk(stcb, chk);
10923         if (chk == NULL) {
10924                 return;
10925         }
10926         chk->copy_by_ref = 0;
10927         iph = mtod(m, struct ip *);
10928         if (iph == NULL) {
10929                 sctp_free_a_chunk(stcb, chk);
10930                 return;
10931         }
10932         switch (iph->ip_v) {
10933         case IPVERSION:
10934                 /* IPv4 */
10935                 len = chk->send_size = iph->ip_len;
10936                 break;
10937 #ifdef INET6
10938         case IPV6_VERSION >> 4:
10939                 /* IPv6 */
10940                 ip6h = mtod(m, struct ip6_hdr *);
10941                 len = chk->send_size = htons(ip6h->ip6_plen);
10942                 break;
10943 #endif
10944         default:
10945                 return;
10946         }
10947         /* Validate that we do not have an ABORT in here. */
10948         offset = iphlen + sizeof(struct sctphdr);
10949         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10950             sizeof(*ch), (uint8_t *) & chunk_buf);
10951         while (ch != NULL) {
10952                 chk_length = ntohs(ch->chunk_length);
10953                 if (chk_length < sizeof(*ch)) {
10954                         /* break to abort land */
10955                         break;
10956                 }
10957                 switch (ch->chunk_type) {
10958                 case SCTP_PACKET_DROPPED:
10959                 case SCTP_ABORT_ASSOCIATION:
10960                         /*-
10961                          * we don't respond with an PKT-DROP to an ABORT
10962                          * or PKT-DROP
10963                          */
10964                         sctp_free_a_chunk(stcb, chk);
10965                         return;
10966                 default:
10967                         break;
10968                 }
10969                 offset += SCTP_SIZE32(chk_length);
10970                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10971                     sizeof(*ch), (uint8_t *) & chunk_buf);
10972         }
10973
10974         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10975             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10976                 /*
10977                  * only send 1 mtu worth, trim off the excess on the end.
10978                  */
10979                 fullsz = len - extra;
10980                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10981                 was_trunc = 1;
10982         }
10983         chk->asoc = &stcb->asoc;
10984         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10985         if (chk->data == NULL) {
10986 jump_out:
10987                 sctp_free_a_chunk(stcb, chk);
10988                 return;
10989         }
10990         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10991         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10992         if (drp == NULL) {
10993                 sctp_m_freem(chk->data);
10994                 chk->data = NULL;
10995                 goto jump_out;
10996         }
10997         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10998             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10999         chk->book_size_scale = 0;
11000         if (was_trunc) {
11001                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11002                 drp->trunc_len = htons(fullsz);
11003                 /*
11004                  * Len is already adjusted to size minus overhead above take
11005                  * out the pkt_drop chunk itself from it.
11006                  */
11007                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11008                 len = chk->send_size;
11009         } else {
11010                 /* no truncation needed */
11011                 drp->ch.chunk_flags = 0;
11012                 drp->trunc_len = htons(0);
11013         }
11014         if (bad_crc) {
11015                 drp->ch.chunk_flags |= SCTP_BADCRC;
11016         }
11017         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11018         SCTP_BUF_LEN(chk->data) = chk->send_size;
11019         chk->sent = SCTP_DATAGRAM_UNSENT;
11020         chk->snd_count = 0;
11021         if (net) {
11022                 /* we should hit here */
11023                 chk->whoTo = net;
11024         } else {
11025                 chk->whoTo = asoc->primary_destination;
11026         }
11027         atomic_add_int(&chk->whoTo->ref_count, 1);
11028         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11029         chk->rec.chunk_id.can_take_data = 1;
11030         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11031         drp->ch.chunk_length = htons(chk->send_size);
11032         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11033         if (spc < 0) {
11034                 spc = 0;
11035         }
11036         drp->bottle_bw = htonl(spc);
11037         if (asoc->my_rwnd) {
11038                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11039                     asoc->size_on_all_streams +
11040                     asoc->my_rwnd_control_len +
11041                     stcb->sctp_socket->so_rcv.sb_cc);
11042         } else {
11043                 /*-
11044                  * If my rwnd is 0, possibly from mbuf depletion as well as
11045                  * space used, tell the peer there is NO space aka onq == bw
11046                  */
11047                 drp->current_onq = htonl(spc);
11048         }
11049         drp->reserved = 0;
11050         datap = drp->data;
11051         m_copydata(m, iphlen, len, (caddr_t)datap);
11052         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11053         asoc->ctrl_queue_cnt++;
11054 }
11055
11056 void
11057 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11058 {
11059         struct sctp_association *asoc;
11060         struct sctp_cwr_chunk *cwr;
11061         struct sctp_tmit_chunk *chk;
11062
11063         asoc = &stcb->asoc;
11064         SCTP_TCB_LOCK_ASSERT(stcb);
11065         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11066                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11067                         /* found a previous ECN_CWR update it if needed */
11068                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11069                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11070                             MAX_TSN)) {
11071                                 cwr->tsn = htonl(high_tsn);
11072                         }
11073                         return;
11074                 }
11075         }
11076         /* nope could not find one to update so we must build one */
11077         sctp_alloc_a_chunk(stcb, chk);
11078         if (chk == NULL) {
11079                 return;
11080         }
11081         chk->copy_by_ref = 0;
11082         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11083         chk->rec.chunk_id.can_take_data = 1;
11084         chk->asoc = &stcb->asoc;
11085         chk->send_size = sizeof(struct sctp_cwr_chunk);
11086         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11087         if (chk->data == NULL) {
11088                 sctp_free_a_chunk(stcb, chk);
11089                 return;
11090         }
11091         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11092         SCTP_BUF_LEN(chk->data) = chk->send_size;
11093         chk->sent = SCTP_DATAGRAM_UNSENT;
11094         chk->snd_count = 0;
11095         chk->whoTo = net;
11096         atomic_add_int(&chk->whoTo->ref_count, 1);
11097         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11098         cwr->ch.chunk_type = SCTP_ECN_CWR;
11099         cwr->ch.chunk_flags = 0;
11100         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11101         cwr->tsn = htonl(high_tsn);
11102         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11103         asoc->ctrl_queue_cnt++;
11104 }
11105
11106 void
11107 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11108     int number_entries, uint16_t * list,
11109     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11110 {
11111         int len, old_len, i;
11112         struct sctp_stream_reset_out_request *req_out;
11113         struct sctp_chunkhdr *ch;
11114
11115         ch = mtod(chk->data, struct sctp_chunkhdr *);
11116
11117
11118         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11119
11120         /* get to new offset for the param. */
11121         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11122         /* now how long will this param be? */
11123         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11124         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11125         req_out->ph.param_length = htons(len);
11126         req_out->request_seq = htonl(seq);
11127         req_out->response_seq = htonl(resp_seq);
11128         req_out->send_reset_at_tsn = htonl(last_sent);
11129         if (number_entries) {
11130                 for (i = 0; i < number_entries; i++) {
11131                         req_out->list_of_streams[i] = htons(list[i]);
11132                 }
11133         }
11134         if (SCTP_SIZE32(len) > len) {
11135                 /*-
11136                  * Need to worry about the pad we may end up adding to the
11137                  * end. This is easy since the struct is either aligned to 4
11138                  * bytes or 2 bytes off.
11139                  */
11140                 req_out->list_of_streams[number_entries] = 0;
11141         }
11142         /* now fix the chunk length */
11143         ch->chunk_length = htons(len + old_len);
11144         chk->book_size = len + old_len;
11145         chk->book_size_scale = 0;
11146         chk->send_size = SCTP_SIZE32(chk->book_size);
11147         SCTP_BUF_LEN(chk->data) = chk->send_size;
11148         return;
11149 }
11150
11151
11152 void
11153 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11154     int number_entries, uint16_t * list,
11155     uint32_t seq)
11156 {
11157         int len, old_len, i;
11158         struct sctp_stream_reset_in_request *req_in;
11159         struct sctp_chunkhdr *ch;
11160
11161         ch = mtod(chk->data, struct sctp_chunkhdr *);
11162
11163
11164         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11165
11166         /* get to new offset for the param. */
11167         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11168         /* now how long will this param be? */
11169         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11170         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11171         req_in->ph.param_length = htons(len);
11172         req_in->request_seq = htonl(seq);
11173         if (number_entries) {
11174                 for (i = 0; i < number_entries; i++) {
11175                         req_in->list_of_streams[i] = htons(list[i]);
11176                 }
11177         }
11178         if (SCTP_SIZE32(len) > len) {
11179                 /*-
11180                  * Need to worry about the pad we may end up adding to the
11181                  * end. This is easy since the struct is either aligned to 4
11182                  * bytes or 2 bytes off.
11183                  */
11184                 req_in->list_of_streams[number_entries] = 0;
11185         }
11186         /* now fix the chunk length */
11187         ch->chunk_length = htons(len + old_len);
11188         chk->book_size = len + old_len;
11189         chk->book_size_scale = 0;
11190         chk->send_size = SCTP_SIZE32(chk->book_size);
11191         SCTP_BUF_LEN(chk->data) = chk->send_size;
11192         return;
11193 }
11194
11195
11196 void
11197 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11198     uint32_t seq)
11199 {
11200         int len, old_len;
11201         struct sctp_stream_reset_tsn_request *req_tsn;
11202         struct sctp_chunkhdr *ch;
11203
11204         ch = mtod(chk->data, struct sctp_chunkhdr *);
11205
11206
11207         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11208
11209         /* get to new offset for the param. */
11210         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11211         /* now how long will this param be? */
11212         len = sizeof(struct sctp_stream_reset_tsn_request);
11213         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11214         req_tsn->ph.param_length = htons(len);
11215         req_tsn->request_seq = htonl(seq);
11216
11217         /* now fix the chunk length */
11218         ch->chunk_length = htons(len + old_len);
11219         chk->send_size = len + old_len;
11220         chk->book_size = SCTP_SIZE32(chk->send_size);
11221         chk->book_size_scale = 0;
11222         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11223         return;
11224 }
11225
11226 void
11227 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11228     uint32_t resp_seq, uint32_t result)
11229 {
11230         int len, old_len;
11231         struct sctp_stream_reset_response *resp;
11232         struct sctp_chunkhdr *ch;
11233
11234         ch = mtod(chk->data, struct sctp_chunkhdr *);
11235
11236
11237         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11238
11239         /* get to new offset for the param. */
11240         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11241         /* now how long will this param be? */
11242         len = sizeof(struct sctp_stream_reset_response);
11243         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11244         resp->ph.param_length = htons(len);
11245         resp->response_seq = htonl(resp_seq);
11246         resp->result = ntohl(result);
11247
11248         /* now fix the chunk length */
11249         ch->chunk_length = htons(len + old_len);
11250         chk->book_size = len + old_len;
11251         chk->book_size_scale = 0;
11252         chk->send_size = SCTP_SIZE32(chk->book_size);
11253         SCTP_BUF_LEN(chk->data) = chk->send_size;
11254         return;
11255
11256 }
11257
11258
11259 void
11260 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11261     uint32_t resp_seq, uint32_t result,
11262     uint32_t send_una, uint32_t recv_next)
11263 {
11264         int len, old_len;
11265         struct sctp_stream_reset_response_tsn *resp;
11266         struct sctp_chunkhdr *ch;
11267
11268         ch = mtod(chk->data, struct sctp_chunkhdr *);
11269
11270
11271         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11272
11273         /* get to new offset for the param. */
11274         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11275         /* now how long will this param be? */
11276         len = sizeof(struct sctp_stream_reset_response_tsn);
11277         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11278         resp->ph.param_length = htons(len);
11279         resp->response_seq = htonl(resp_seq);
11280         resp->result = htonl(result);
11281         resp->senders_next_tsn = htonl(send_una);
11282         resp->receivers_next_tsn = htonl(recv_next);
11283
11284         /* now fix the chunk length */
11285         ch->chunk_length = htons(len + old_len);
11286         chk->book_size = len + old_len;
11287         chk->send_size = SCTP_SIZE32(chk->book_size);
11288         chk->book_size_scale = 0;
11289         SCTP_BUF_LEN(chk->data) = chk->send_size;
11290         return;
11291 }
11292
11293 static void
11294 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11295     uint32_t seq,
11296     uint16_t adding)
11297 {
11298         int len, old_len;
11299         struct sctp_chunkhdr *ch;
11300         struct sctp_stream_reset_add_strm *addstr;
11301
11302         ch = mtod(chk->data, struct sctp_chunkhdr *);
11303         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11304
11305         /* get to new offset for the param. */
11306         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11307         /* now how long will this param be? */
11308         len = sizeof(struct sctp_stream_reset_add_strm);
11309
11310         /* Fill it out. */
11311         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11312         addstr->ph.param_length = htons(len);
11313         addstr->request_seq = htonl(seq);
11314         addstr->number_of_streams = htons(adding);
11315         addstr->reserved = 0;
11316
11317         /* now fix the chunk length */
11318         ch->chunk_length = htons(len + old_len);
11319         chk->send_size = len + old_len;
11320         chk->book_size = SCTP_SIZE32(chk->send_size);
11321         chk->book_size_scale = 0;
11322         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11323         return;
11324 }
11325
11326 int
11327 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11328     int number_entries, uint16_t * list,
11329     uint8_t send_out_req,
11330     uint32_t resp_seq,
11331     uint8_t send_in_req,
11332     uint8_t send_tsn_req,
11333     uint8_t add_stream,
11334     uint16_t adding
11335 )
11336 {
11337
11338         struct sctp_association *asoc;
11339         struct sctp_tmit_chunk *chk;
11340         struct sctp_chunkhdr *ch;
11341         uint32_t seq;
11342
11343         asoc = &stcb->asoc;
11344         if (asoc->stream_reset_outstanding) {
11345                 /*-
11346                  * Already one pending, must get ACK back to clear the flag.
11347                  */
11348                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11349                 return (EBUSY);
11350         }
11351         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11352             (add_stream == 0)) {
11353                 /* nothing to do */
11354                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11355                 return (EINVAL);
11356         }
11357         if (send_tsn_req && (send_out_req || send_in_req)) {
11358                 /* error, can't do that */
11359                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11360                 return (EINVAL);
11361         }
11362         sctp_alloc_a_chunk(stcb, chk);
11363         if (chk == NULL) {
11364                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11365                 return (ENOMEM);
11366         }
11367         chk->copy_by_ref = 0;
11368         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11369         chk->rec.chunk_id.can_take_data = 0;
11370         chk->asoc = &stcb->asoc;
11371         chk->book_size = sizeof(struct sctp_chunkhdr);
11372         chk->send_size = SCTP_SIZE32(chk->book_size);
11373         chk->book_size_scale = 0;
11374
11375         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11376         if (chk->data == NULL) {
11377                 sctp_free_a_chunk(stcb, chk);
11378                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11379                 return (ENOMEM);
11380         }
11381         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11382
11383         /* setup chunk parameters */
11384         chk->sent = SCTP_DATAGRAM_UNSENT;
11385         chk->snd_count = 0;
11386         chk->whoTo = asoc->primary_destination;
11387         atomic_add_int(&chk->whoTo->ref_count, 1);
11388
11389         ch = mtod(chk->data, struct sctp_chunkhdr *);
11390         ch->chunk_type = SCTP_STREAM_RESET;
11391         ch->chunk_flags = 0;
11392         ch->chunk_length = htons(chk->book_size);
11393         SCTP_BUF_LEN(chk->data) = chk->send_size;
11394
11395         seq = stcb->asoc.str_reset_seq_out;
11396         if (send_out_req) {
11397                 sctp_add_stream_reset_out(chk, number_entries, list,
11398                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11399                 asoc->stream_reset_out_is_outstanding = 1;
11400                 seq++;
11401                 asoc->stream_reset_outstanding++;
11402         }
11403         if (add_stream) {
11404                 sctp_add_a_stream(chk, seq, adding);
11405                 seq++;
11406                 asoc->stream_reset_outstanding++;
11407         }
11408         if (send_in_req) {
11409                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11410                 asoc->stream_reset_outstanding++;
11411         }
11412         if (send_tsn_req) {
11413                 sctp_add_stream_reset_tsn(chk, seq);
11414                 asoc->stream_reset_outstanding++;
11415         }
11416         asoc->str_reset = chk;
11417
11418         /* insert the chunk for sending */
11419         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11420             chk,
11421             sctp_next);
11422         asoc->ctrl_queue_cnt++;
11423         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11424         return (0);
11425 }
11426
11427 void
11428 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11429     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11430 {
11431         /*-
11432          * Formulate the abort message, and send it back down.
11433          */
11434         struct mbuf *o_pak;
11435         struct mbuf *mout;
11436         struct sctp_abort_msg *abm;
11437         struct ip *iph, *iph_out;
11438         struct udphdr *udp;
11439
11440 #ifdef INET6
11441         struct ip6_hdr *ip6, *ip6_out;
11442
11443 #endif
11444         int iphlen_out, len;
11445
11446         /* don't respond to ABORT with ABORT */
11447         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11448                 if (err_cause)
11449                         sctp_m_freem(err_cause);
11450                 return;
11451         }
11452         iph = mtod(m, struct ip *);
11453         switch (iph->ip_v) {
11454         case IPVERSION:
11455                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11456                 break;
11457 #ifdef INET6
11458         case IPV6_VERSION >> 4:
11459                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11460                 break;
11461 #endif
11462         default:
11463                 if (err_cause) {
11464                         sctp_m_freem(err_cause);
11465                 }
11466                 return;
11467         }
11468         if (port) {
11469                 len += sizeof(struct udphdr);
11470         }
11471         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11472         if (mout == NULL) {
11473                 if (err_cause) {
11474                         sctp_m_freem(err_cause);
11475                 }
11476                 return;
11477         }
11478         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11479         SCTP_BUF_LEN(mout) = len;
11480         SCTP_BUF_NEXT(mout) = err_cause;
11481         iph_out = NULL;
11482 #ifdef INET6
11483         ip6_out = NULL;
11484 #endif
11485         switch (iph->ip_v) {
11486         case IPVERSION:
11487                 iph_out = mtod(mout, struct ip *);
11488
11489                 /* Fill in the IP header for the ABORT */
11490                 iph_out->ip_v = IPVERSION;
11491                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11492                 iph_out->ip_tos = (u_char)0;
11493                 iph_out->ip_id = 0;
11494                 iph_out->ip_off = 0;
11495                 iph_out->ip_ttl = MAXTTL;
11496                 if (port) {
11497                         iph_out->ip_p = IPPROTO_UDP;
11498                 } else {
11499                         iph_out->ip_p = IPPROTO_SCTP;
11500                 }
11501                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11502                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11503                 /* let IP layer calculate this */
11504                 iph_out->ip_sum = 0;
11505
11506                 iphlen_out = sizeof(*iph_out);
11507                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11508                 break;
11509 #ifdef INET6
11510         case IPV6_VERSION >> 4:
11511                 ip6 = (struct ip6_hdr *)iph;
11512                 ip6_out = mtod(mout, struct ip6_hdr *);
11513
11514                 /* Fill in the IP6 header for the ABORT */
11515                 ip6_out->ip6_flow = ip6->ip6_flow;
11516                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11517                 if (port) {
11518                         ip6_out->ip6_nxt = IPPROTO_UDP;
11519                 } else {
11520                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11521                 }
11522                 ip6_out->ip6_src = ip6->ip6_dst;
11523                 ip6_out->ip6_dst = ip6->ip6_src;
11524
11525                 iphlen_out = sizeof(*ip6_out);
11526                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11527                 break;
11528 #endif                          /* INET6 */
11529         default:
11530                 /* Currently not supported */
11531                 sctp_m_freem(mout);
11532                 return;
11533         }
11534
11535         udp = (struct udphdr *)abm;
11536         if (port) {
11537                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11538                 udp->uh_dport = port;
11539                 /* set udp->uh_ulen later */
11540                 udp->uh_sum = 0;
11541                 iphlen_out += sizeof(struct udphdr);
11542                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11543         }
11544         abm->sh.src_port = sh->dest_port;
11545         abm->sh.dest_port = sh->src_port;
11546         abm->sh.checksum = 0;
11547         if (vtag == 0) {
11548                 abm->sh.v_tag = sh->v_tag;
11549                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11550         } else {
11551                 abm->sh.v_tag = htonl(vtag);
11552                 abm->msg.ch.chunk_flags = 0;
11553         }
11554         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11555
11556         if (err_cause) {
11557                 struct mbuf *m_tmp = err_cause;
11558                 int err_len = 0;
11559
11560                 /* get length of the err_cause chain */
11561                 while (m_tmp != NULL) {
11562                         err_len += SCTP_BUF_LEN(m_tmp);
11563                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11564                 }
11565                 len = SCTP_BUF_LEN(mout) + err_len;
11566                 if (err_len % 4) {
11567                         /* need pad at end of chunk */
11568                         uint32_t cpthis = 0;
11569                         int padlen;
11570
11571                         padlen = 4 - (len % 4);
11572                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11573                         len += padlen;
11574                 }
11575                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11576         } else {
11577                 len = SCTP_BUF_LEN(mout);
11578                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11579         }
11580
11581         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11582                 /* no mbuf's */
11583                 sctp_m_freem(mout);
11584                 return;
11585         }
11586         if (iph_out != NULL) {
11587                 sctp_route_t ro;
11588                 struct sctp_tcb *stcb = NULL;
11589                 int ret;
11590
11591                 /* zap the stack pointer to the route */
11592                 bzero(&ro, sizeof ro);
11593                 if (port) {
11594                         udp->uh_ulen = htons(len - sizeof(struct ip));
11595                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11596                 }
11597                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11598                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11599                 /* set IPv4 length */
11600                 iph_out->ip_len = len;
11601                 /* out it goes */
11602 #ifdef  SCTP_PACKET_LOGGING
11603                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11604                         sctp_packet_log(mout, len);
11605 #endif
11606                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11607                 if (port) {
11608                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11609                         SCTP_STAT_INCR(sctps_sendswcrc);
11610                         SCTP_ENABLE_UDP_CSUM(o_pak);
11611                 } else {
11612                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11613                         mout->m_pkthdr.csum_data = 0;
11614                         SCTP_STAT_INCR(sctps_sendhwcrc);
11615                 }
11616                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11617
11618                 /* Free the route if we got one back */
11619                 if (ro.ro_rt)
11620                         RTFREE(ro.ro_rt);
11621         }
11622 #ifdef INET6
11623         if (ip6_out != NULL) {
11624                 struct route_in6 ro;
11625                 int ret;
11626                 struct sctp_tcb *stcb = NULL;
11627                 struct ifnet *ifp = NULL;
11628
11629                 /* zap the stack pointer to the route */
11630                 bzero(&ro, sizeof(ro));
11631                 if (port) {
11632                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11633                 }
11634                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11635                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11636                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11637 #ifdef  SCTP_PACKET_LOGGING
11638                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11639                         sctp_packet_log(mout, len);
11640 #endif
11641                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11642                 if (port) {
11643                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
11644                             (stcb) &&
11645                             (stcb->asoc.loopback_scope))) {
11646                                 abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11647                                 SCTP_STAT_INCR(sctps_sendswcrc);
11648                         } else {
11649                                 SCTP_STAT_INCR(sctps_sendnocrc);
11650                         }
11651                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11652                                 udp->uh_sum = 0xffff;
11653                         }
11654                 } else {
11655                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
11656                             (stcb) &&
11657                             (stcb->asoc.loopback_scope))) {
11658                                 mout->m_pkthdr.csum_flags = CSUM_SCTP;
11659                                 mout->m_pkthdr.csum_data = 0;
11660                                 SCTP_STAT_INCR(sctps_sendhwcrc);
11661                         } else {
11662                                 SCTP_STAT_INCR(sctps_sendnocrc);
11663                         }
11664                 }
11665                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11666
11667                 /* Free the route if we got one back */
11668                 if (ro.ro_rt)
11669                         RTFREE(ro.ro_rt);
11670         }
11671 #endif
11672         SCTP_STAT_INCR(sctps_sendpackets);
11673         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11674         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11675 }
11676
11677 void
11678 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11679     uint32_t vrf_id, uint16_t port)
11680 {
11681         struct mbuf *o_pak;
11682         struct sctphdr *sh, *sh_out;
11683         struct sctp_chunkhdr *ch;
11684         struct ip *iph, *iph_out;
11685         struct udphdr *udp = NULL;
11686         struct mbuf *mout;
11687
11688 #ifdef INET6
11689         struct ip6_hdr *ip6, *ip6_out;
11690
11691 #endif
11692         int iphlen_out, len;
11693
11694         iph = mtod(m, struct ip *);
11695         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11696         switch (iph->ip_v) {
11697         case IPVERSION:
11698                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11699                 break;
11700 #ifdef INET6
11701         case IPV6_VERSION >> 4:
11702                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11703                 break;
11704 #endif
11705         default:
11706                 if (scm) {
11707                         sctp_m_freem(scm);
11708                 }
11709                 return;
11710         }
11711         if (port) {
11712                 len += sizeof(struct udphdr);
11713         }
11714         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11715         if (mout == NULL) {
11716                 if (scm) {
11717                         sctp_m_freem(scm);
11718                 }
11719                 return;
11720         }
11721         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11722         SCTP_BUF_LEN(mout) = len;
11723         SCTP_BUF_NEXT(mout) = scm;
11724         iph_out = NULL;
11725 #ifdef INET6
11726         ip6_out = NULL;
11727 #endif
11728         switch (iph->ip_v) {
11729         case IPVERSION:
11730                 iph_out = mtod(mout, struct ip *);
11731
11732                 /* Fill in the IP header for the ABORT */
11733                 iph_out->ip_v = IPVERSION;
11734                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11735                 iph_out->ip_tos = (u_char)0;
11736                 iph_out->ip_id = 0;
11737                 iph_out->ip_off = 0;
11738                 iph_out->ip_ttl = MAXTTL;
11739                 if (port) {
11740                         iph_out->ip_p = IPPROTO_UDP;
11741                 } else {
11742                         iph_out->ip_p = IPPROTO_SCTP;
11743                 }
11744                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11745                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11746                 /* let IP layer calculate this */
11747                 iph_out->ip_sum = 0;
11748
11749                 iphlen_out = sizeof(struct ip);
11750                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11751                 break;
11752 #ifdef INET6
11753         case IPV6_VERSION >> 4:
11754                 ip6 = (struct ip6_hdr *)iph;
11755                 ip6_out = mtod(mout, struct ip6_hdr *);
11756
11757                 /* Fill in the IP6 header for the ABORT */
11758                 ip6_out->ip6_flow = ip6->ip6_flow;
11759                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11760                 if (port) {
11761                         ip6_out->ip6_nxt = IPPROTO_UDP;
11762                 } else {
11763                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11764                 }
11765                 ip6_out->ip6_src = ip6->ip6_dst;
11766                 ip6_out->ip6_dst = ip6->ip6_src;
11767
11768                 iphlen_out = sizeof(struct ip6_hdr);
11769                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11770                 break;
11771 #endif                          /* INET6 */
11772         default:
11773                 /* Currently not supported */
11774                 sctp_m_freem(mout);
11775                 return;
11776         }
11777
11778         udp = (struct udphdr *)sh_out;
11779         if (port) {
11780                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11781                 udp->uh_dport = port;
11782                 /* set udp->uh_ulen later */
11783                 udp->uh_sum = 0;
11784                 iphlen_out += sizeof(struct udphdr);
11785                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11786         }
11787         sh_out->src_port = sh->dest_port;
11788         sh_out->dest_port = sh->src_port;
11789         sh_out->v_tag = vtag;
11790         sh_out->checksum = 0;
11791
11792         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11793         ch->chunk_type = SCTP_OPERATION_ERROR;
11794         ch->chunk_flags = 0;
11795
11796         if (scm) {
11797                 struct mbuf *m_tmp = scm;
11798                 int cause_len = 0;
11799
11800                 /* get length of the err_cause chain */
11801                 while (m_tmp != NULL) {
11802                         cause_len += SCTP_BUF_LEN(m_tmp);
11803                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11804                 }
11805                 len = SCTP_BUF_LEN(mout) + cause_len;
11806                 if (cause_len % 4) {
11807                         /* need pad at end of chunk */
11808                         uint32_t cpthis = 0;
11809                         int padlen;
11810
11811                         padlen = 4 - (len % 4);
11812                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11813                         len += padlen;
11814                 }
11815                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11816         } else {
11817                 len = SCTP_BUF_LEN(mout);
11818                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11819         }
11820
11821         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11822                 /* no mbuf's */
11823                 sctp_m_freem(mout);
11824                 return;
11825         }
11826         if (iph_out != NULL) {
11827                 sctp_route_t ro;
11828                 struct sctp_tcb *stcb = NULL;
11829                 int ret;
11830
11831                 /* zap the stack pointer to the route */
11832                 bzero(&ro, sizeof ro);
11833                 if (port) {
11834                         udp->uh_ulen = htons(len - sizeof(struct ip));
11835                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11836                 }
11837                 /* set IPv4 length */
11838                 iph_out->ip_len = len;
11839                 /* out it goes */
11840 #ifdef  SCTP_PACKET_LOGGING
11841                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11842                         sctp_packet_log(mout, len);
11843 #endif
11844                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11845                 if (port) {
11846                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11847                         SCTP_STAT_INCR(sctps_sendswcrc);
11848                         SCTP_ENABLE_UDP_CSUM(o_pak);
11849                 } else {
11850                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11851                         mout->m_pkthdr.csum_data = 0;
11852                         SCTP_STAT_INCR(sctps_sendhwcrc);
11853                 }
11854                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11855
11856                 /* Free the route if we got one back */
11857                 if (ro.ro_rt)
11858                         RTFREE(ro.ro_rt);
11859         }
11860 #ifdef INET6
11861         if (ip6_out != NULL) {
11862                 struct route_in6 ro;
11863                 int ret;
11864                 struct sctp_tcb *stcb = NULL;
11865                 struct ifnet *ifp = NULL;
11866
11867                 /* zap the stack pointer to the route */
11868                 bzero(&ro, sizeof(ro));
11869                 if (port) {
11870                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11871                 }
11872                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11873 #ifdef  SCTP_PACKET_LOGGING
11874                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11875                         sctp_packet_log(mout, len);
11876 #endif
11877                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11878                 if (port) {
11879                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
11880                             (stcb) &&
11881                             (stcb->asoc.loopback_scope))) {
11882                                 sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11883                                 SCTP_STAT_INCR(sctps_sendswcrc);
11884                         } else {
11885                                 SCTP_STAT_INCR(sctps_sendnocrc);
11886                         }
11887                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11888                                 udp->uh_sum = 0xffff;
11889                         }
11890                 } else {
11891                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
11892                             (stcb) &&
11893                             (stcb->asoc.loopback_scope))) {
11894                                 mout->m_pkthdr.csum_flags = CSUM_SCTP;
11895                                 mout->m_pkthdr.csum_data = 0;
11896                                 SCTP_STAT_INCR(sctps_sendhwcrc);
11897                         } else {
11898                                 SCTP_STAT_INCR(sctps_sendnocrc);
11899                         }
11900                 }
11901                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11902
11903                 /* Free the route if we got one back */
11904                 if (ro.ro_rt)
11905                         RTFREE(ro.ro_rt);
11906         }
11907 #endif
11908         SCTP_STAT_INCR(sctps_sendpackets);
11909         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11910         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11911 }
11912
11913 static struct mbuf *
11914 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11915     struct uio *uio,
11916     struct sctp_sndrcvinfo *srcv,
11917     int max_send_len,
11918     int user_marks_eor,
11919     int *error,
11920     uint32_t * sndout,
11921     struct mbuf **new_tail)
11922 {
11923         struct mbuf *m;
11924
11925         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11926             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11927         if (m == NULL) {
11928                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11929                 *error = ENOMEM;
11930         } else {
11931                 *sndout = m_length(m, NULL);
11932                 *new_tail = m_last(m);
11933         }
11934         return (m);
11935 }
11936
11937 static int
11938 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11939     struct uio *uio,
11940     int resv_upfront)
11941 {
11942         int left;
11943
11944         left = sp->length;
11945         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11946             resv_upfront, 0);
11947         if (sp->data == NULL) {
11948                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11949                 return (ENOMEM);
11950         }
11951         sp->tail_mbuf = m_last(sp->data);
11952         return (0);
11953 }
11954
11955
11956
11957 static struct sctp_stream_queue_pending *
11958 sctp_copy_it_in(struct sctp_tcb *stcb,
11959     struct sctp_association *asoc,
11960     struct sctp_sndrcvinfo *srcv,
11961     struct uio *uio,
11962     struct sctp_nets *net,
11963     int max_send_len,
11964     int user_marks_eor,
11965     int *error,
11966     int non_blocking)
11967 {
11968         /*-
11969          * This routine must be very careful in its work. Protocol
11970          * processing is up and running so care must be taken to spl...()
11971          * when you need to do something that may effect the stcb/asoc. The
11972          * sb is locked however. When data is copied the protocol processing
11973          * should be enabled since this is a slower operation...
11974          */
11975         struct sctp_stream_queue_pending *sp = NULL;
11976         int resv_in_first;
11977
11978         *error = 0;
11979         /* Now can we send this? */
11980         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11981             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11982             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11983             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11984                 /* got data while shutting down */
11985                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11986                 *error = ECONNRESET;
11987                 goto out_now;
11988         }
11989         sctp_alloc_a_strmoq(stcb, sp);
11990         if (sp == NULL) {
11991                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11992                 *error = ENOMEM;
11993                 goto out_now;
11994         }
11995         sp->act_flags = 0;
11996         sp->sender_all_done = 0;
11997         sp->sinfo_flags = srcv->sinfo_flags;
11998         sp->timetolive = srcv->sinfo_timetolive;
11999         sp->ppid = srcv->sinfo_ppid;
12000         sp->context = srcv->sinfo_context;
12001         sp->strseq = 0;
12002         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12003
12004         sp->stream = srcv->sinfo_stream;
12005         sp->length = min(uio->uio_resid, max_send_len);
12006         if ((sp->length == (uint32_t) uio->uio_resid) &&
12007             ((user_marks_eor == 0) ||
12008             (srcv->sinfo_flags & SCTP_EOF) ||
12009             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12010                 sp->msg_is_complete = 1;
12011         } else {
12012                 sp->msg_is_complete = 0;
12013         }
12014         sp->sender_all_done = 0;
12015         sp->some_taken = 0;
12016         sp->put_last_out = 0;
12017         resv_in_first = sizeof(struct sctp_data_chunk);
12018         sp->data = sp->tail_mbuf = NULL;
12019         if (sp->length == 0) {
12020                 *error = 0;
12021                 goto skip_copy;
12022         }
12023         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12024         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12025                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12026                 sp->holds_key_ref = 1;
12027         }
12028         *error = sctp_copy_one(sp, uio, resv_in_first);
12029 skip_copy:
12030         if (*error) {
12031                 sctp_free_a_strmoq(stcb, sp);
12032                 sp = NULL;
12033         } else {
12034                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12035                         sp->net = net;
12036                 } else {
12037                         sp->net = asoc->primary_destination;
12038                 }
12039                 atomic_add_int(&sp->net->ref_count, 1);
12040                 sctp_set_prsctp_policy(sp);
12041         }
12042 out_now:
12043         return (sp);
12044 }
12045
12046
12047 int
12048 sctp_sosend(struct socket *so,
12049     struct sockaddr *addr,
12050     struct uio *uio,
12051     struct mbuf *top,
12052     struct mbuf *control,
12053     int flags,
12054     struct thread *p
12055 )
12056 {
12057         struct sctp_inpcb *inp;
12058         int error, use_rcvinfo = 0;
12059         struct sctp_sndrcvinfo srcv;
12060         struct sockaddr *addr_to_use;
12061
12062 #ifdef INET6
12063         struct sockaddr_in sin;
12064
12065 #endif
12066
12067         inp = (struct sctp_inpcb *)so->so_pcb;
12068         if (control) {
12069                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12070                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12071                     sizeof(srcv))) {
12072                         /* got one */
12073                         use_rcvinfo = 1;
12074                 }
12075         }
12076         addr_to_use = addr;
12077 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
12078         if ((addr) && (addr->sa_family == AF_INET6)) {
12079                 struct sockaddr_in6 *sin6;
12080
12081                 sin6 = (struct sockaddr_in6 *)addr;
12082                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12083                         in6_sin6_2_sin(&sin, sin6);
12084                         addr_to_use = (struct sockaddr *)&sin;
12085                 }
12086         }
12087 #endif
12088         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12089             control,
12090             flags,
12091             use_rcvinfo, &srcv
12092             ,p
12093             );
12094         return (error);
12095 }
12096
12097
12098 int
12099 sctp_lower_sosend(struct socket *so,
12100     struct sockaddr *addr,
12101     struct uio *uio,
12102     struct mbuf *i_pak,
12103     struct mbuf *control,
12104     int flags,
12105     int use_rcvinfo,
12106     struct sctp_sndrcvinfo *srcv
12107     ,
12108     struct thread *p
12109 )
12110 {
12111         unsigned int sndlen = 0, max_len;
12112         int error, len;
12113         struct mbuf *top = NULL;
12114         int queue_only = 0, queue_only_for_init = 0;
12115         int free_cnt_applied = 0;
12116         int un_sent = 0;
12117         int now_filled = 0;
12118         unsigned int inqueue_bytes = 0;
12119         struct sctp_block_entry be;
12120         struct sctp_inpcb *inp;
12121         struct sctp_tcb *stcb = NULL;
12122         struct timeval now;
12123         struct sctp_nets *net;
12124         struct sctp_association *asoc;
12125         struct sctp_inpcb *t_inp;
12126         int user_marks_eor;
12127         int create_lock_applied = 0;
12128         int nagle_applies = 0;
12129         int some_on_control = 0;
12130         int got_all_of_the_send = 0;
12131         int hold_tcblock = 0;
12132         int non_blocking = 0;
12133         int temp_flags = 0;
12134         uint32_t local_add_more, local_soresv = 0;
12135
12136         error = 0;
12137         net = NULL;
12138         stcb = NULL;
12139         asoc = NULL;
12140
12141         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12142         if (inp == NULL) {
12143                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12144                 error = EINVAL;
12145                 if (i_pak) {
12146                         SCTP_RELEASE_PKT(i_pak);
12147                 }
12148                 return (error);
12149         }
12150         if ((uio == NULL) && (i_pak == NULL)) {
12151                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12152                 return (EINVAL);
12153         }
12154         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12155         atomic_add_int(&inp->total_sends, 1);
12156         if (uio) {
12157                 if (uio->uio_resid < 0) {
12158                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12159                         return (EINVAL);
12160                 }
12161                 sndlen = uio->uio_resid;
12162         } else {
12163                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12164                 sndlen = SCTP_HEADER_LEN(i_pak);
12165         }
12166         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12167             addr,
12168             sndlen);
12169         /*-
12170          * Pre-screen address, if one is given the sin-len
12171          * must be set correctly!
12172          */
12173         if (addr) {
12174                 if ((addr->sa_family == AF_INET) &&
12175                     (addr->sa_len != sizeof(struct sockaddr_in))) {
12176                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12177                         error = EINVAL;
12178                         goto out_unlocked;
12179                 } else if ((addr->sa_family == AF_INET6) &&
12180                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
12181                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12182                         error = EINVAL;
12183                         goto out_unlocked;
12184                 }
12185         }
12186         hold_tcblock = 0;
12187
12188         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12189             (inp->sctp_socket->so_qlimit)) {
12190                 /* The listener can NOT send */
12191                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12192                 error = ENOTCONN;
12193                 goto out_unlocked;
12194         }
12195         if ((use_rcvinfo) && srcv) {
12196                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
12197                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
12198                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12199                         error = EINVAL;
12200                         goto out_unlocked;
12201                 }
12202                 if (srcv->sinfo_flags)
12203                         SCTP_STAT_INCR(sctps_sends_with_flags);
12204
12205                 if (srcv->sinfo_flags & SCTP_SENDALL) {
12206                         /* its a sendall */
12207                         error = sctp_sendall(inp, uio, top, srcv);
12208                         top = NULL;
12209                         goto out_unlocked;
12210                 }
12211         }
12212         /* now we must find the assoc */
12213         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12214             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12215                 SCTP_INP_RLOCK(inp);
12216                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12217                 if (stcb == NULL) {
12218                         SCTP_INP_RUNLOCK(inp);
12219                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12220                         error = ENOTCONN;
12221                         goto out_unlocked;
12222                 }
12223                 SCTP_TCB_LOCK(stcb);
12224                 hold_tcblock = 1;
12225                 SCTP_INP_RUNLOCK(inp);
12226                 if (addr) {
12227                         /* Must locate the net structure if addr given */
12228                         net = sctp_findnet(stcb, addr);
12229                         if (net) {
12230                                 /* validate port was 0 or correct */
12231                                 struct sockaddr_in *sin;
12232
12233                                 sin = (struct sockaddr_in *)addr;
12234                                 if ((sin->sin_port != 0) &&
12235                                     (sin->sin_port != stcb->rport)) {
12236                                         net = NULL;
12237                                 }
12238                         }
12239                         temp_flags |= SCTP_ADDR_OVER;
12240                 } else
12241                         net = stcb->asoc.primary_destination;
12242                 if (addr && (net == NULL)) {
12243                         /* Could not find address, was it legal */
12244                         if (addr->sa_family == AF_INET) {
12245                                 struct sockaddr_in *sin;
12246
12247                                 sin = (struct sockaddr_in *)addr;
12248                                 if (sin->sin_addr.s_addr == 0) {
12249                                         if ((sin->sin_port == 0) ||
12250                                             (sin->sin_port == stcb->rport)) {
12251                                                 net = stcb->asoc.primary_destination;
12252                                         }
12253                                 }
12254                         } else {
12255                                 struct sockaddr_in6 *sin6;
12256
12257                                 sin6 = (struct sockaddr_in6 *)addr;
12258                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
12259                                         if ((sin6->sin6_port == 0) ||
12260                                             (sin6->sin6_port == stcb->rport)) {
12261                                                 net = stcb->asoc.primary_destination;
12262                                         }
12263                                 }
12264                         }
12265                 }
12266                 if (net == NULL) {
12267                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12268                         error = EINVAL;
12269                         goto out_unlocked;
12270                 }
12271         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
12272                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
12273                 if (stcb) {
12274                         if (addr)
12275                                 /*
12276                                  * Must locate the net structure if addr
12277                                  * given
12278                                  */
12279                                 net = sctp_findnet(stcb, addr);
12280                         else
12281                                 net = stcb->asoc.primary_destination;
12282                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
12283                             ((net == NULL) || (addr == NULL))) {
12284                                 struct sockaddr_in *sin;
12285
12286                                 if (addr == NULL) {
12287                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12288                                         error = EINVAL;
12289                                         goto out_unlocked;
12290                                 }
12291                                 sin = (struct sockaddr_in *)addr;
12292                                 /* Validate port is 0 or correct */
12293                                 if ((sin->sin_port != 0) &&
12294                                     (sin->sin_port != stcb->rport)) {
12295                                         net = NULL;
12296                                 }
12297                         }
12298                 }
12299                 hold_tcblock = 0;
12300         } else if (addr) {
12301                 /*-
12302                  * Since we did not use findep we must
12303                  * increment it, and if we don't find a tcb
12304                  * decrement it.
12305                  */
12306                 SCTP_INP_WLOCK(inp);
12307                 SCTP_INP_INCR_REF(inp);
12308                 SCTP_INP_WUNLOCK(inp);
12309                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12310                 if (stcb == NULL) {
12311                         SCTP_INP_WLOCK(inp);
12312                         SCTP_INP_DECR_REF(inp);
12313                         SCTP_INP_WUNLOCK(inp);
12314                 } else {
12315                         hold_tcblock = 1;
12316                 }
12317         }
12318         if ((stcb == NULL) && (addr)) {
12319                 /* Possible implicit send? */
12320                 SCTP_ASOC_CREATE_LOCK(inp);
12321                 create_lock_applied = 1;
12322                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12323                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12324                         /* Should I really unlock ? */
12325                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12326                         error = EINVAL;
12327                         goto out_unlocked;
12328
12329                 }
12330                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12331                     (addr->sa_family == AF_INET6)) {
12332                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12333                         error = EINVAL;
12334                         goto out_unlocked;
12335                 }
12336                 SCTP_INP_WLOCK(inp);
12337                 SCTP_INP_INCR_REF(inp);
12338                 SCTP_INP_WUNLOCK(inp);
12339                 /* With the lock applied look again */
12340                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12341                 if (stcb == NULL) {
12342                         SCTP_INP_WLOCK(inp);
12343                         SCTP_INP_DECR_REF(inp);
12344                         SCTP_INP_WUNLOCK(inp);
12345                 } else {
12346                         hold_tcblock = 1;
12347                 }
12348                 if (t_inp != inp) {
12349                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12350                         error = ENOTCONN;
12351                         goto out_unlocked;
12352                 }
12353         }
12354         if (stcb == NULL) {
12355                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12356                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12357                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12358                         error = ENOTCONN;
12359                         goto out_unlocked;
12360                 }
12361                 if (addr == NULL) {
12362                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12363                         error = ENOENT;
12364                         goto out_unlocked;
12365                 } else {
12366                         /*
12367                          * UDP style, we must go ahead and start the INIT
12368                          * process
12369                          */
12370                         uint32_t vrf_id;
12371
12372                         if ((use_rcvinfo) && (srcv) &&
12373                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12374                             ((srcv->sinfo_flags & SCTP_EOF) &&
12375                             (sndlen == 0)))) {
12376                                 /*-
12377                                  * User asks to abort a non-existant assoc,
12378                                  * or EOF a non-existant assoc with no data
12379                                  */
12380                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12381                                 error = ENOENT;
12382                                 goto out_unlocked;
12383                         }
12384                         /* get an asoc/stcb struct */
12385                         vrf_id = inp->def_vrf_id;
12386 #ifdef INVARIANTS
12387                         if (create_lock_applied == 0) {
12388                                 panic("Error, should hold create lock and I don't?");
12389                         }
12390 #endif
12391                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12392                             p
12393                             );
12394                         if (stcb == NULL) {
12395                                 /* Error is setup for us in the call */
12396                                 goto out_unlocked;
12397                         }
12398                         if (create_lock_applied) {
12399                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12400                                 create_lock_applied = 0;
12401                         } else {
12402                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12403                         }
12404                         /*
12405                          * Turn on queue only flag to prevent data from
12406                          * being sent
12407                          */
12408                         queue_only = 1;
12409                         asoc = &stcb->asoc;
12410                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12411                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12412
12413                         /* initialize authentication params for the assoc */
12414                         sctp_initialize_auth_params(inp, stcb);
12415
12416                         if (control) {
12417                                 /*
12418                                  * see if a init structure exists in cmsg
12419                                  * headers
12420                                  */
12421                                 struct sctp_initmsg initm;
12422                                 int i;
12423
12424                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12425                                     sizeof(initm))) {
12426                                         /*
12427                                          * we have an INIT override of the
12428                                          * default
12429                                          */
12430                                         if (initm.sinit_max_attempts)
12431                                                 asoc->max_init_times = initm.sinit_max_attempts;
12432                                         if (initm.sinit_num_ostreams)
12433                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12434                                         if (initm.sinit_max_instreams)
12435                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12436                                         if (initm.sinit_max_init_timeo)
12437                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12438                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12439                                                 struct sctp_stream_out *tmp_str;
12440                                                 int had_lock = 0;
12441
12442                                                 /* Default is NOT correct */
12443                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12444                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12445                                                 /*
12446                                                  * What happens if this
12447                                                  * fails? we panic ...
12448                                                  */
12449
12450                                                 if (hold_tcblock) {
12451                                                         had_lock = 1;
12452                                                         SCTP_TCB_UNLOCK(stcb);
12453                                                 }
12454                                                 SCTP_MALLOC(tmp_str,
12455                                                     struct sctp_stream_out *,
12456                                                     (asoc->pre_open_streams *
12457                                                     sizeof(struct sctp_stream_out)),
12458                                                     SCTP_M_STRMO);
12459                                                 if (had_lock) {
12460                                                         SCTP_TCB_LOCK(stcb);
12461                                                 }
12462                                                 if (tmp_str != NULL) {
12463                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12464                                                         asoc->strmout = tmp_str;
12465                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12466                                                 } else {
12467                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12468                                                 }
12469                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12470                                                         /*-
12471                                                          * inbound side must be set
12472                                                          * to 0xffff, also NOTE when
12473                                                          * we get the INIT-ACK back
12474                                                          * (for INIT sender) we MUST
12475                                                          * reduce the count
12476                                                          * (streamoutcnt) but first
12477                                                          * check if we sent to any
12478                                                          * of the upper streams that
12479                                                          * were dropped (if some
12480                                                          * were). Those that were
12481                                                          * dropped must be notified
12482                                                          * to the upper layer as
12483                                                          * failed to send.
12484                                                          */
12485                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12486                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12487                                                         asoc->strmout[i].stream_no = i;
12488                                                         asoc->strmout[i].last_msg_incomplete = 0;
12489                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12490                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12491                                                 }
12492                                         }
12493                                 }
12494                         }
12495                         hold_tcblock = 1;
12496                         /* out with the INIT */
12497                         queue_only_for_init = 1;
12498                         /*-
12499                          * we may want to dig in after this call and adjust the MTU
12500                          * value. It defaulted to 1500 (constant) but the ro
12501                          * structure may now have an update and thus we may need to
12502                          * change it BEFORE we append the message.
12503                          */
12504                         net = stcb->asoc.primary_destination;
12505                         asoc = &stcb->asoc;
12506                 }
12507         }
12508         if ((SCTP_SO_IS_NBIO(so)
12509             || (flags & MSG_NBIO)
12510             )) {
12511                 non_blocking = 1;
12512         }
12513         asoc = &stcb->asoc;
12514         atomic_add_int(&stcb->total_sends, 1);
12515
12516         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12517                 if (sndlen > asoc->smallest_mtu) {
12518                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12519                         error = EMSGSIZE;
12520                         goto out_unlocked;
12521                 }
12522         }
12523         /* would we block? */
12524         if (non_blocking) {
12525                 if (hold_tcblock == 0) {
12526                         SCTP_TCB_LOCK(stcb);
12527                         hold_tcblock = 1;
12528                 }
12529                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12530                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12531                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12532                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12533                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12534                                 error = EMSGSIZE;
12535                         else
12536                                 error = EWOULDBLOCK;
12537                         goto out_unlocked;
12538                 }
12539                 stcb->asoc.sb_send_resv += sndlen;
12540                 SCTP_TCB_UNLOCK(stcb);
12541                 hold_tcblock = 0;
12542         } else {
12543                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12544         }
12545         local_soresv = sndlen;
12546         /* Keep the stcb from being freed under our feet */
12547         if (free_cnt_applied) {
12548 #ifdef INVARIANTS
12549                 panic("refcnt already incremented");
12550 #else
12551                 printf("refcnt:1 already incremented?\n");
12552 #endif
12553         } else {
12554                 atomic_add_int(&stcb->asoc.refcnt, 1);
12555                 free_cnt_applied = 1;
12556         }
12557         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12558                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12559                 error = ECONNRESET;
12560                 goto out_unlocked;
12561         }
12562         if (create_lock_applied) {
12563                 SCTP_ASOC_CREATE_UNLOCK(inp);
12564                 create_lock_applied = 0;
12565         }
12566         if (asoc->stream_reset_outstanding) {
12567                 /*
12568                  * Can't queue any data while stream reset is underway.
12569                  */
12570                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12571                 error = EAGAIN;
12572                 goto out_unlocked;
12573         }
12574         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12575             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12576                 queue_only = 1;
12577         }
12578         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12579                 /* Grab the default stuff from the asoc */
12580                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12581         }
12582         /* we are now done with all control */
12583         if (control) {
12584                 sctp_m_freem(control);
12585                 control = NULL;
12586         }
12587         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12588             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12589             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12590             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12591                 if ((use_rcvinfo) &&
12592                     (srcv->sinfo_flags & SCTP_ABORT)) {
12593                         ;
12594                 } else {
12595                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12596                         error = ECONNRESET;
12597                         goto out_unlocked;
12598                 }
12599         }
12600         /* Ok, we will attempt a msgsnd :> */
12601         if (p) {
12602                 p->td_ru.ru_msgsnd++;
12603         }
12604         if (stcb) {
12605                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12606                         net = stcb->asoc.primary_destination;
12607                 }
12608         }
12609         if (net == NULL) {
12610                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12611                 error = EINVAL;
12612                 goto out_unlocked;
12613         }
12614         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12615                 /*-
12616                  * CMT: Added check for CMT above. net above is the primary
12617                  * dest. If CMT is ON, sender should always attempt to send
12618                  * with the output routine sctp_fill_outqueue() that loops
12619                  * through all destination addresses. Therefore, if CMT is
12620                  * ON, queue_only is NOT set to 1 here, so that
12621                  * sctp_chunk_output() can be called below.
12622                  */
12623                 queue_only = 1;
12624         } else if (asoc->ifp_had_enobuf) {
12625                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12626                 if (net->flight_size > (net->mtu * 2))
12627                         queue_only = 1;
12628                 asoc->ifp_had_enobuf = 0;
12629         } else {
12630                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12631                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12632         }
12633         /* Are we aborting? */
12634         if (srcv->sinfo_flags & SCTP_ABORT) {
12635                 struct mbuf *mm;
12636                 int tot_demand, tot_out = 0, max_out;
12637
12638                 SCTP_STAT_INCR(sctps_sends_with_abort);
12639                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12640                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12641                         /* It has to be up before we abort */
12642                         /* how big is the user initiated abort? */
12643                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12644                         error = EINVAL;
12645                         goto out;
12646                 }
12647                 if (hold_tcblock) {
12648                         SCTP_TCB_UNLOCK(stcb);
12649                         hold_tcblock = 0;
12650                 }
12651                 if (top) {
12652                         struct mbuf *cntm = NULL;
12653
12654                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12655                         if (sndlen != 0) {
12656                                 cntm = top;
12657                                 while (cntm) {
12658                                         tot_out += SCTP_BUF_LEN(cntm);
12659                                         cntm = SCTP_BUF_NEXT(cntm);
12660                                 }
12661                         }
12662                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12663                 } else {
12664                         /* Must fit in a MTU */
12665                         tot_out = sndlen;
12666                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12667                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12668                                 /* To big */
12669                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12670                                 error = EMSGSIZE;
12671                                 goto out;
12672                         }
12673                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12674                 }
12675                 if (mm == NULL) {
12676                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12677                         error = ENOMEM;
12678                         goto out;
12679                 }
12680                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12681                 max_out -= sizeof(struct sctp_abort_msg);
12682                 if (tot_out > max_out) {
12683                         tot_out = max_out;
12684                 }
12685                 if (mm) {
12686                         struct sctp_paramhdr *ph;
12687
12688                         /* now move forward the data pointer */
12689                         ph = mtod(mm, struct sctp_paramhdr *);
12690                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12691                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12692                         ph++;
12693                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12694                         if (top == NULL) {
12695                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12696                                 if (error) {
12697                                         /*-
12698                                          * Here if we can't get his data we
12699                                          * still abort we just don't get to
12700                                          * send the users note :-0
12701                                          */
12702                                         sctp_m_freem(mm);
12703                                         mm = NULL;
12704                                 }
12705                         } else {
12706                                 if (sndlen != 0) {
12707                                         SCTP_BUF_NEXT(mm) = top;
12708                                 }
12709                         }
12710                 }
12711                 if (hold_tcblock == 0) {
12712                         SCTP_TCB_LOCK(stcb);
12713                         hold_tcblock = 1;
12714                 }
12715                 atomic_add_int(&stcb->asoc.refcnt, -1);
12716                 free_cnt_applied = 0;
12717                 /* release this lock, otherwise we hang on ourselves */
12718                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12719                     SCTP_RESPONSE_TO_USER_REQ,
12720                     mm, SCTP_SO_LOCKED);
12721                 /* now relock the stcb so everything is sane */
12722                 hold_tcblock = 0;
12723                 stcb = NULL;
12724                 /*
12725                  * In this case top is already chained to mm avoid double
12726                  * free, since we free it below if top != NULL and driver
12727                  * would free it after sending the packet out
12728                  */
12729                 if (sndlen != 0) {
12730                         top = NULL;
12731                 }
12732                 goto out_unlocked;
12733         }
12734         /* Calculate the maximum we can send */
12735         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12736         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12737                 if (non_blocking) {
12738                         /* we already checked for non-blocking above. */
12739                         max_len = sndlen;
12740                 } else {
12741                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12742                 }
12743         } else {
12744                 max_len = 0;
12745         }
12746         if (hold_tcblock) {
12747                 SCTP_TCB_UNLOCK(stcb);
12748                 hold_tcblock = 0;
12749         }
12750         /* Is the stream no. valid? */
12751         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12752                 /* Invalid stream number */
12753                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12754                 error = EINVAL;
12755                 goto out_unlocked;
12756         }
12757         if (asoc->strmout == NULL) {
12758                 /* huh? software error */
12759                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12760                 error = EFAULT;
12761                 goto out_unlocked;
12762         }
12763         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12764         if ((user_marks_eor == 0) &&
12765             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12766                 /* It will NEVER fit */
12767                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12768                 error = EMSGSIZE;
12769                 goto out_unlocked;
12770         }
12771         if ((uio == NULL) && user_marks_eor) {
12772                 /*-
12773                  * We do not support eeor mode for
12774                  * sending with mbuf chains (like sendfile).
12775                  */
12776                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12777                 error = EINVAL;
12778                 goto out_unlocked;
12779         }
12780         if (user_marks_eor) {
12781                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12782         } else {
12783                 /*-
12784                  * For non-eeor the whole message must fit in
12785                  * the socket send buffer.
12786                  */
12787                 local_add_more = sndlen;
12788         }
12789         len = 0;
12790         if (non_blocking) {
12791                 goto skip_preblock;
12792         }
12793         if (((max_len <= local_add_more) &&
12794             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12795             (max_len == 0) ||
12796             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12797                 /* No room right now ! */
12798                 SOCKBUF_LOCK(&so->so_snd);
12799                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12800                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12801                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12802                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12803                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12804                             inqueue_bytes,
12805                             local_add_more,
12806                             stcb->asoc.stream_queue_cnt,
12807                             stcb->asoc.chunks_on_out_queue,
12808                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12809                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12810                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12811                         }
12812                         be.error = 0;
12813                         stcb->block_entry = &be;
12814                         error = sbwait(&so->so_snd);
12815                         stcb->block_entry = NULL;
12816                         if (error || so->so_error || be.error) {
12817                                 if (error == 0) {
12818                                         if (so->so_error)
12819                                                 error = so->so_error;
12820                                         if (be.error) {
12821                                                 error = be.error;
12822                                         }
12823                                 }
12824                                 SOCKBUF_UNLOCK(&so->so_snd);
12825                                 goto out_unlocked;
12826                         }
12827                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12828                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12829                                     so, asoc, stcb->asoc.total_output_queue_size);
12830                         }
12831                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12832                                 goto out_unlocked;
12833                         }
12834                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12835                 }
12836                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12837                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12838                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12839                 } else {
12840                         max_len = 0;
12841                 }
12842                 SOCKBUF_UNLOCK(&so->so_snd);
12843         }
12844 skip_preblock:
12845         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12846                 goto out_unlocked;
12847         }
12848         /*
12849          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12850          * case NOTE: uio will be null when top/mbuf is passed
12851          */
12852         if (sndlen == 0) {
12853                 if (srcv->sinfo_flags & SCTP_EOF) {
12854                         got_all_of_the_send = 1;
12855                         goto dataless_eof;
12856                 } else {
12857                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12858                         error = EINVAL;
12859                         goto out;
12860                 }
12861         }
12862         if (top == NULL) {
12863                 struct sctp_stream_queue_pending *sp;
12864                 struct sctp_stream_out *strm;
12865                 uint32_t sndout, initial_out;
12866
12867                 initial_out = uio->uio_resid;
12868
12869                 SCTP_TCB_SEND_LOCK(stcb);
12870                 if ((asoc->stream_locked) &&
12871                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12872                         SCTP_TCB_SEND_UNLOCK(stcb);
12873                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12874                         error = EINVAL;
12875                         goto out;
12876                 }
12877                 SCTP_TCB_SEND_UNLOCK(stcb);
12878
12879                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12880                 if (strm->last_msg_incomplete == 0) {
12881         do_a_copy_in:
12882                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12883                         if ((sp == NULL) || (error)) {
12884                                 goto out;
12885                         }
12886                         SCTP_TCB_SEND_LOCK(stcb);
12887                         if (sp->msg_is_complete) {
12888                                 strm->last_msg_incomplete = 0;
12889                                 asoc->stream_locked = 0;
12890                         } else {
12891                                 /*
12892                                  * Just got locked to this guy in case of an
12893                                  * interrupt.
12894                                  */
12895                                 strm->last_msg_incomplete = 1;
12896                                 asoc->stream_locked = 1;
12897                                 asoc->stream_locked_on = srcv->sinfo_stream;
12898                                 sp->sender_all_done = 0;
12899                         }
12900                         sctp_snd_sb_alloc(stcb, sp->length);
12901                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12902                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12903                                 sp->strseq = strm->next_sequence_sent;
12904                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12905                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12906                                             (uintptr_t) stcb, sp->length,
12907                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12908                                 }
12909                                 strm->next_sequence_sent++;
12910                         } else {
12911                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12912                         }
12913                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12914                         if ((strm->next_spoke.tqe_next == NULL) &&
12915                             (strm->next_spoke.tqe_prev == NULL)) {
12916                                 /* Not on wheel, insert */
12917                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12918                         }
12919                         SCTP_TCB_SEND_UNLOCK(stcb);
12920                 } else {
12921                         SCTP_TCB_SEND_LOCK(stcb);
12922                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12923                         SCTP_TCB_SEND_UNLOCK(stcb);
12924                         if (sp == NULL) {
12925                                 /* ???? Huh ??? last msg is gone */
12926 #ifdef INVARIANTS
12927                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12928 #else
12929                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12930                                 strm->last_msg_incomplete = 0;
12931 #endif
12932                                 goto do_a_copy_in;
12933
12934                         }
12935                 }
12936                 while (uio->uio_resid > 0) {
12937                         /* How much room do we have? */
12938                         struct mbuf *new_tail, *mm;
12939
12940                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12941                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12942                         else
12943                                 max_len = 0;
12944
12945                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12946                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12947                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12948                                 sndout = 0;
12949                                 new_tail = NULL;
12950                                 if (hold_tcblock) {
12951                                         SCTP_TCB_UNLOCK(stcb);
12952                                         hold_tcblock = 0;
12953                                 }
12954                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12955                                 if ((mm == NULL) || error) {
12956                                         if (mm) {
12957                                                 sctp_m_freem(mm);
12958                                         }
12959                                         goto out;
12960                                 }
12961                                 /* Update the mbuf and count */
12962                                 SCTP_TCB_SEND_LOCK(stcb);
12963                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12964                                         /*
12965                                          * we need to get out. Peer probably
12966                                          * aborted.
12967                                          */
12968                                         sctp_m_freem(mm);
12969                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12970                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12971                                                 error = ECONNRESET;
12972                                         }
12973                                         SCTP_TCB_SEND_UNLOCK(stcb);
12974                                         goto out;
12975                                 }
12976                                 if (sp->tail_mbuf) {
12977                                         /* tack it to the end */
12978                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12979                                         sp->tail_mbuf = new_tail;
12980                                 } else {
12981                                         /* A stolen mbuf */
12982                                         sp->data = mm;
12983                                         sp->tail_mbuf = new_tail;
12984                                 }
12985                                 sctp_snd_sb_alloc(stcb, sndout);
12986                                 atomic_add_int(&sp->length, sndout);
12987                                 len += sndout;
12988
12989                                 /* Did we reach EOR? */
12990                                 if ((uio->uio_resid == 0) &&
12991                                     ((user_marks_eor == 0) ||
12992                                     (srcv->sinfo_flags & SCTP_EOF) ||
12993                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12994                                         sp->msg_is_complete = 1;
12995                                 } else {
12996                                         sp->msg_is_complete = 0;
12997                                 }
12998                                 SCTP_TCB_SEND_UNLOCK(stcb);
12999                         }
13000                         if (uio->uio_resid == 0) {
13001                                 /* got it all? */
13002                                 continue;
13003                         }
13004                         /* PR-SCTP? */
13005                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13006                                 /*
13007                                  * This is ugly but we must assure locking
13008                                  * order
13009                                  */
13010                                 if (hold_tcblock == 0) {
13011                                         SCTP_TCB_LOCK(stcb);
13012                                         hold_tcblock = 1;
13013                                 }
13014                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13015                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13016                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13017                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13018                                 else
13019                                         max_len = 0;
13020                                 if (max_len > 0) {
13021                                         continue;
13022                                 }
13023                                 SCTP_TCB_UNLOCK(stcb);
13024                                 hold_tcblock = 0;
13025                         }
13026                         /* wait for space now */
13027                         if (non_blocking) {
13028                                 /* Non-blocking io in place out */
13029                                 goto skip_out_eof;
13030                         }
13031                         if ((net->flight_size > net->cwnd) &&
13032                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13033                                 queue_only = 1;
13034                         } else if (asoc->ifp_had_enobuf) {
13035                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13036                                 if (net->flight_size > (net->mtu * 2)) {
13037                                         queue_only = 1;
13038                                 } else {
13039                                         queue_only = 0;
13040                                 }
13041                                 asoc->ifp_had_enobuf = 0;
13042                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13043                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13044                         } else {
13045                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13046                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13047                                 if (net->flight_size > net->cwnd) {
13048                                         queue_only = 1;
13049                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13050                                 } else {
13051                                         queue_only = 0;
13052                                 }
13053                         }
13054                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13055                             (stcb->asoc.total_flight > 0) &&
13056                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13057                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13058
13059                                 /*-
13060                                  * Ok, Nagle is set on and we have data outstanding.
13061                                  * Don't send anything and let SACKs drive out the
13062                                  * data unless wen have a "full" segment to send.
13063                                  */
13064                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13065                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13066                                 }
13067                                 SCTP_STAT_INCR(sctps_naglequeued);
13068                                 nagle_applies = 1;
13069                         } else {
13070                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13071                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13072                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13073                                 }
13074                                 SCTP_STAT_INCR(sctps_naglesent);
13075                                 nagle_applies = 0;
13076                         }
13077                         /* What about the INIT, send it maybe */
13078                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13079
13080                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13081                                     nagle_applies, un_sent);
13082                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13083                                     stcb->asoc.total_flight,
13084                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13085                         }
13086                         if (queue_only_for_init) {
13087                                 if (hold_tcblock == 0) {
13088                                         SCTP_TCB_LOCK(stcb);
13089                                         hold_tcblock = 1;
13090                                 }
13091                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13092                                         /* a collision took us forward? */
13093                                         queue_only_for_init = 0;
13094                                         queue_only = 0;
13095                                 } else {
13096                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13097                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13098                                         queue_only_for_init = 0;
13099                                         queue_only = 1;
13100                                 }
13101                         }
13102                         if ((queue_only == 0) && (nagle_applies == 0)) {
13103                                 /*-
13104                                  * need to start chunk output
13105                                  * before blocking.. note that if
13106                                  * a lock is already applied, then
13107                                  * the input via the net is happening
13108                                  * and I don't need to start output :-D
13109                                  */
13110                                 if (hold_tcblock == 0) {
13111                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13112                                                 hold_tcblock = 1;
13113                                                 sctp_chunk_output(inp,
13114                                                     stcb,
13115                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13116                                         }
13117                                 } else {
13118                                         sctp_chunk_output(inp,
13119                                             stcb,
13120                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13121                                 }
13122                                 if (hold_tcblock == 1) {
13123                                         SCTP_TCB_UNLOCK(stcb);
13124                                         hold_tcblock = 0;
13125                                 }
13126                         }
13127                         SOCKBUF_LOCK(&so->so_snd);
13128                         /*-
13129                          * This is a bit strange, but I think it will
13130                          * work. The total_output_queue_size is locked and
13131                          * protected by the TCB_LOCK, which we just released.
13132                          * There is a race that can occur between releasing it
13133                          * above, and me getting the socket lock, where sacks
13134                          * come in but we have not put the SB_WAIT on the
13135                          * so_snd buffer to get the wakeup. After the LOCK
13136                          * is applied the sack_processing will also need to
13137                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13138                          * once we have the socket buffer lock if we recheck the
13139                          * size we KNOW we will get to sleep safely with the
13140                          * wakeup flag in place.
13141                          */
13142                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13143                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13144                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13145                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13146                                             so, asoc, uio->uio_resid);
13147                                 }
13148                                 be.error = 0;
13149                                 stcb->block_entry = &be;
13150                                 error = sbwait(&so->so_snd);
13151                                 stcb->block_entry = NULL;
13152
13153                                 if (error || so->so_error || be.error) {
13154                                         if (error == 0) {
13155                                                 if (so->so_error)
13156                                                         error = so->so_error;
13157                                                 if (be.error) {
13158                                                         error = be.error;
13159                                                 }
13160                                         }
13161                                         SOCKBUF_UNLOCK(&so->so_snd);
13162                                         goto out_unlocked;
13163                                 }
13164                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13165                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13166                                             so, asoc, stcb->asoc.total_output_queue_size);
13167                                 }
13168                         }
13169                         SOCKBUF_UNLOCK(&so->so_snd);
13170                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13171                                 goto out_unlocked;
13172                         }
13173                 }
13174                 SCTP_TCB_SEND_LOCK(stcb);
13175                 if (sp) {
13176                         if (sp->msg_is_complete == 0) {
13177                                 strm->last_msg_incomplete = 1;
13178                                 asoc->stream_locked = 1;
13179                                 asoc->stream_locked_on = srcv->sinfo_stream;
13180                         } else {
13181                                 sp->sender_all_done = 1;
13182                                 strm->last_msg_incomplete = 0;
13183                                 asoc->stream_locked = 0;
13184                         }
13185                 } else {
13186                         SCTP_PRINTF("Huh no sp TSNH?\n");
13187                         strm->last_msg_incomplete = 0;
13188                         asoc->stream_locked = 0;
13189                 }
13190                 SCTP_TCB_SEND_UNLOCK(stcb);
13191                 if (uio->uio_resid == 0) {
13192                         got_all_of_the_send = 1;
13193                 }
13194         } else if (top) {
13195                 /* We send in a 0, since we do NOT have any locks */
13196                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13197                 top = NULL;
13198                 if (srcv->sinfo_flags & SCTP_EOF) {
13199                         /*
13200                          * This should only happen for Panda for the mbuf
13201                          * send case, which does NOT yet support EEOR mode.
13202                          * Thus, we can just set this flag to do the proper
13203                          * EOF handling.
13204                          */
13205                         got_all_of_the_send = 1;
13206                 }
13207         }
13208         if (error) {
13209                 goto out;
13210         }
13211 dataless_eof:
13212         /* EOF thing ? */
13213         if ((srcv->sinfo_flags & SCTP_EOF) &&
13214             (got_all_of_the_send == 1) &&
13215             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13216                 int cnt;
13217
13218                 SCTP_STAT_INCR(sctps_sends_with_eof);
13219                 error = 0;
13220                 if (hold_tcblock == 0) {
13221                         SCTP_TCB_LOCK(stcb);
13222                         hold_tcblock = 1;
13223                 }
13224                 cnt = sctp_is_there_unsent_data(stcb);
13225                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13226                     TAILQ_EMPTY(&asoc->sent_queue) &&
13227                     (cnt == 0)) {
13228                         if (asoc->locked_on_sending) {
13229                                 goto abort_anyway;
13230                         }
13231                         /* there is nothing queued to send, so I'm done... */
13232                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13233                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13234                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13235                                 /* only send SHUTDOWN the first time through */
13236                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13237                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13238                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13239                                 }
13240                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13241                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13242                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13243                                     asoc->primary_destination);
13244                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13245                                     asoc->primary_destination);
13246                         }
13247                 } else {
13248                         /*-
13249                          * we still got (or just got) data to send, so set
13250                          * SHUTDOWN_PENDING
13251                          */
13252                         /*-
13253                          * XXX sockets draft says that SCTP_EOF should be
13254                          * sent with no data.  currently, we will allow user
13255                          * data to be sent first and move to
13256                          * SHUTDOWN-PENDING
13257                          */
13258                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13259                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13260                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13261                                 if (hold_tcblock == 0) {
13262                                         SCTP_TCB_LOCK(stcb);
13263                                         hold_tcblock = 1;
13264                                 }
13265                                 if (asoc->locked_on_sending) {
13266                                         /* Locked to send out the data */
13267                                         struct sctp_stream_queue_pending *sp;
13268
13269                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13270                                         if (sp) {
13271                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13272                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13273                                         }
13274                                 }
13275                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13276                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13277                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13278                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13279                         abort_anyway:
13280                                         if (free_cnt_applied) {
13281                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13282                                                 free_cnt_applied = 0;
13283                                         }
13284                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13285                                             SCTP_RESPONSE_TO_USER_REQ,
13286                                             NULL, SCTP_SO_LOCKED);
13287                                         /*
13288                                          * now relock the stcb so everything
13289                                          * is sane
13290                                          */
13291                                         hold_tcblock = 0;
13292                                         stcb = NULL;
13293                                         goto out;
13294                                 }
13295                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13296                                     asoc->primary_destination);
13297                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13298                         }
13299                 }
13300         }
13301 skip_out_eof:
13302         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13303                 some_on_control = 1;
13304         }
13305         if ((net->flight_size > net->cwnd) &&
13306             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13307                 queue_only = 1;
13308         } else if (asoc->ifp_had_enobuf) {
13309                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13310                 if (net->flight_size > (net->mtu * 2)) {
13311                         queue_only = 1;
13312                 } else {
13313                         queue_only = 0;
13314                 }
13315                 asoc->ifp_had_enobuf = 0;
13316                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13317                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13318         } else {
13319                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13320                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13321                 if (net->flight_size > net->cwnd) {
13322                         queue_only = 1;
13323                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13324                 } else {
13325                         queue_only = 0;
13326                 }
13327         }
13328         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13329             (stcb->asoc.total_flight > 0) &&
13330             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13331             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13332                 /*-
13333                  * Ok, Nagle is set on and we have data outstanding.
13334                  * Don't send anything and let SACKs drive out the
13335                  * data unless wen have a "full" segment to send.
13336                  */
13337                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13338                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13339                 }
13340                 SCTP_STAT_INCR(sctps_naglequeued);
13341                 nagle_applies = 1;
13342         } else {
13343                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13344                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13345                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13346                 }
13347                 SCTP_STAT_INCR(sctps_naglesent);
13348                 nagle_applies = 0;
13349         }
13350         if (queue_only_for_init) {
13351                 if (hold_tcblock == 0) {
13352                         SCTP_TCB_LOCK(stcb);
13353                         hold_tcblock = 1;
13354                 }
13355                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13356                         /* a collision took us forward? */
13357                         queue_only_for_init = 0;
13358                         queue_only = 0;
13359                 } else {
13360                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13361                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13362                         queue_only_for_init = 0;
13363                         queue_only = 1;
13364                 }
13365         }
13366         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13367                 /* we can attempt to send too. */
13368                 if (hold_tcblock == 0) {
13369                         /*
13370                          * If there is activity recv'ing sacks no need to
13371                          * send
13372                          */
13373                         if (SCTP_TCB_TRYLOCK(stcb)) {
13374                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13375                                 hold_tcblock = 1;
13376                         }
13377                 } else {
13378                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13379                 }
13380         } else if ((queue_only == 0) &&
13381                     (stcb->asoc.peers_rwnd == 0) &&
13382             (stcb->asoc.total_flight == 0)) {
13383                 /* We get to have a probe outstanding */
13384                 if (hold_tcblock == 0) {
13385                         hold_tcblock = 1;
13386                         SCTP_TCB_LOCK(stcb);
13387                 }
13388                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13389         } else if (some_on_control) {
13390                 int num_out, reason, frag_point;
13391
13392                 /* Here we do control only */
13393                 if (hold_tcblock == 0) {
13394                         hold_tcblock = 1;
13395                         SCTP_TCB_LOCK(stcb);
13396                 }
13397                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13398                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13399                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13400         }
13401         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13402             queue_only, stcb->asoc.peers_rwnd, un_sent,
13403             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13404             stcb->asoc.total_output_queue_size, error);
13405
13406 out:
13407 out_unlocked:
13408
13409         if (local_soresv && stcb) {
13410                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13411                 local_soresv = 0;
13412         }
13413         if (create_lock_applied) {
13414                 SCTP_ASOC_CREATE_UNLOCK(inp);
13415                 create_lock_applied = 0;
13416         }
13417         if ((stcb) && hold_tcblock) {
13418                 SCTP_TCB_UNLOCK(stcb);
13419         }
13420         if (stcb && free_cnt_applied) {
13421                 atomic_add_int(&stcb->asoc.refcnt, -1);
13422         }
13423 #ifdef INVARIANTS
13424         if (stcb) {
13425                 if (mtx_owned(&stcb->tcb_mtx)) {
13426                         panic("Leaving with tcb mtx owned?");
13427                 }
13428                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13429                         panic("Leaving with tcb send mtx owned?");
13430                 }
13431         }
13432 #endif
13433 #ifdef INVARIANTS
13434         if (inp) {
13435                 sctp_validate_no_locks(inp);
13436         } else {
13437                 printf("Warning - inp is NULL so cant validate locks\n");
13438         }
13439 #endif
13440         if (top) {
13441                 sctp_m_freem(top);
13442         }
13443         if (control) {
13444                 sctp_m_freem(control);
13445         }
13446         return (error);
13447 }
13448
13449
13450 /*
13451  * generate an AUTHentication chunk, if required
13452  */
13453 struct mbuf *
13454 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13455     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13456     struct sctp_tcb *stcb, uint8_t chunk)
13457 {
13458         struct mbuf *m_auth;
13459         struct sctp_auth_chunk *auth;
13460         int chunk_len;
13461
13462         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13463             (stcb == NULL))
13464                 return (m);
13465
13466         /* sysctl disabled auth? */
13467         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13468                 return (m);
13469
13470         /* peer doesn't do auth... */
13471         if (!stcb->asoc.peer_supports_auth) {
13472                 return (m);
13473         }
13474         /* does the requested chunk require auth? */
13475         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13476                 return (m);
13477         }
13478         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13479         if (m_auth == NULL) {
13480                 /* no mbuf's */
13481                 return (m);
13482         }
13483         /* reserve some space if this will be the first mbuf */
13484         if (m == NULL)
13485                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13486         /* fill in the AUTH chunk details */
13487         auth = mtod(m_auth, struct sctp_auth_chunk *);
13488         bzero(auth, sizeof(*auth));
13489         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13490         auth->ch.chunk_flags = 0;
13491         chunk_len = sizeof(*auth) +
13492             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13493         auth->ch.chunk_length = htons(chunk_len);
13494         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13495         /* key id and hmac digest will be computed and filled in upon send */
13496
13497         /* save the offset where the auth was inserted into the chain */
13498         if (m != NULL) {
13499                 struct mbuf *cn;
13500
13501                 *offset = 0;
13502                 cn = m;
13503                 while (cn) {
13504                         *offset += SCTP_BUF_LEN(cn);
13505                         cn = SCTP_BUF_NEXT(cn);
13506                 }
13507         } else
13508                 *offset = 0;
13509
13510         /* update length and return pointer to the auth chunk */
13511         SCTP_BUF_LEN(m_auth) = chunk_len;
13512         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13513         if (auth_ret != NULL)
13514                 *auth_ret = auth;
13515
13516         return (m);
13517 }
13518
13519 #ifdef INET6
13520 int
13521 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13522 {
13523         struct nd_prefix *pfx = NULL;
13524         struct nd_pfxrouter *pfxrtr = NULL;
13525         struct sockaddr_in6 gw6;
13526
13527         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13528                 return (0);
13529
13530         /* get prefix entry of address */
13531         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13532                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13533                         continue;
13534                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13535                     &src6->sin6_addr, &pfx->ndpr_mask))
13536                         break;
13537         }
13538         /* no prefix entry in the prefix list */
13539         if (pfx == NULL) {
13540                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13541                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13542                 return (0);
13543         }
13544         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13545         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13546
13547         /* search installed gateway from prefix entry */
13548         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13549             pfxrtr->pfr_next) {
13550                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13551                 gw6.sin6_family = AF_INET6;
13552                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13553                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13554                     sizeof(struct in6_addr));
13555                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13556                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13557                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13558                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13559                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13560                     ro->ro_rt->rt_gateway)) {
13561                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13562                         return (1);
13563                 }
13564         }
13565         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13566         return (0);
13567 }
13568
13569 #endif
13570
13571 int
13572 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13573 {
13574         struct sockaddr_in *sin, *mask;
13575         struct ifaddr *ifa;
13576         struct in_addr srcnetaddr, gwnetaddr;
13577
13578         if (ro == NULL || ro->ro_rt == NULL ||
13579             sifa->address.sa.sa_family != AF_INET) {
13580                 return (0);
13581         }
13582         ifa = (struct ifaddr *)sifa->ifa;
13583         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13584         sin = (struct sockaddr_in *)&sifa->address.sin;
13585         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13586         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13587         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13588         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13589
13590         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13591         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13592         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13593         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13594         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13595         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13596                 return (1);
13597         }
13598         return (0);
13599 }