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 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__)
3494                         ip->ip_off = IP_DF;
3495 #else
3496                         ip->ip_off = htons(IP_DF);
3497 #endif
3498                 } else
3499                         ip->ip_off = 0;
3500
3501                 /* FreeBSD has a function for ip_id's */
3502                 ip->ip_id = ip_newid();
3503
3504                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3505                 ip->ip_len = packet_length;
3506                 if (stcb) {
3507                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3508                                 /* Enable ECN */
3509                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3510                         } else {
3511                                 /* No ECN */
3512                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3513                         }
3514                 } else {
3515                         /* no association at all */
3516                         ip->ip_tos = (tos_value & 0xfc);
3517                 }
3518                 if (port) {
3519                         ip->ip_p = IPPROTO_UDP;
3520                 } else {
3521                         ip->ip_p = IPPROTO_SCTP;
3522                 }
3523                 ip->ip_sum = 0;
3524                 if (net == NULL) {
3525                         ro = &iproute;
3526                         memset(&iproute, 0, sizeof(iproute));
3527                         memcpy(&ro->ro_dst, to, to->sa_len);
3528                 } else {
3529                         ro = (sctp_route_t *) & net->ro;
3530                 }
3531                 /* Now the address selection part */
3532                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3533
3534                 /* call the routine to select the src address */
3535                 if (net && out_of_asoc_ok == 0) {
3536                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3537                                 sctp_free_ifa(net->ro._s_addr);
3538                                 net->ro._s_addr = NULL;
3539                                 net->src_addr_selected = 0;
3540                                 if (ro->ro_rt) {
3541                                         RTFREE(ro->ro_rt);
3542                                         ro->ro_rt = NULL;
3543                                 }
3544                         }
3545                         if (net->src_addr_selected == 0) {
3546                                 /* Cache the source address */
3547                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3548                                     ro, net, 0,
3549                                     vrf_id);
3550                                 net->src_addr_selected = 1;
3551                         }
3552                         if (net->ro._s_addr == NULL) {
3553                                 /* No route to host */
3554                                 net->src_addr_selected = 0;
3555                                 goto no_route;
3556                         }
3557                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3558                 } else {
3559                         if (over_addr == NULL) {
3560                                 struct sctp_ifa *_lsrc;
3561
3562                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3563                                     net,
3564                                     out_of_asoc_ok,
3565                                     vrf_id);
3566                                 if (_lsrc == NULL) {
3567                                         goto no_route;
3568                                 }
3569                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3570                                 sctp_free_ifa(_lsrc);
3571                         } else {
3572                                 ip->ip_src = over_addr->sin.sin_addr;
3573                                 SCTP_RTALLOC(ro, vrf_id);
3574                         }
3575                 }
3576                 if (port) {
3577                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3578                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3579                         udp->uh_dport = port;
3580                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3581                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3582                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3583                 } else {
3584                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3585                 }
3586
3587                 sctphdr->src_port = src_port;
3588                 sctphdr->dest_port = dest_port;
3589                 sctphdr->v_tag = v_tag;
3590                 sctphdr->checksum = 0;
3591
3592                 /*
3593                  * If source address selection fails and we find no route
3594                  * then the ip_output should fail as well with a
3595                  * NO_ROUTE_TO_HOST type error. We probably should catch
3596                  * that somewhere and abort the association right away
3597                  * (assuming this is an INIT being sent).
3598                  */
3599                 if ((ro->ro_rt == NULL)) {
3600                         /*
3601                          * src addr selection failed to find a route (or
3602                          * valid source addr), so we can't get there from
3603                          * here (yet)!
3604                          */
3605         no_route:
3606                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3607                             "%s: dropped packet - no valid source addr\n",
3608                             __FUNCTION__);
3609                         if (net) {
3610                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3611                                     "Destination was ");
3612                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3613                                     &net->ro._l_addr.sa);
3614                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3615                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3616                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3617                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3618                                                     stcb,
3619                                                     SCTP_FAILED_THRESHOLD,
3620                                                     (void *)net,
3621                                                     so_locked);
3622                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3623                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3624                                                 /*
3625                                                  * JRS 5/14/07 - If a
3626                                                  * destination is
3627                                                  * unreachable, the PF bit
3628                                                  * is turned off.  This
3629                                                  * allows an unambiguous use
3630                                                  * of the PF bit for
3631                                                  * destinations that are
3632                                                  * reachable but potentially
3633                                                  * failed. If the
3634                                                  * destination is set to the
3635                                                  * unreachable state, also
3636                                                  * set the destination to
3637                                                  * the PF state.
3638                                                  */
3639                                                 /*
3640                                                  * Add debug message here if
3641                                                  * destination is not in PF
3642                                                  * state.
3643                                                  */
3644                                                 /*
3645                                                  * Stop any running T3
3646                                                  * timers here?
3647                                                  */
3648                                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
3649                                                         net->dest_state &= ~SCTP_ADDR_PF;
3650                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3651                                                             net);
3652                                                 }
3653                                         }
3654                                 }
3655                                 if (stcb) {
3656                                         if (net == stcb->asoc.primary_destination) {
3657                                                 /* need a new primary */
3658                                                 struct sctp_nets *alt;
3659
3660                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3661                                                 if (alt != net) {
3662                                                         if (sctp_set_primary_addr(stcb,
3663                                                             (struct sockaddr *)NULL,
3664                                                             alt) == 0) {
3665                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3666                                                                 if (net->ro._s_addr) {
3667                                                                         sctp_free_ifa(net->ro._s_addr);
3668                                                                         net->ro._s_addr = NULL;
3669                                                                 }
3670                                                                 net->src_addr_selected = 0;
3671                                                         }
3672                                                 }
3673                                         }
3674                                 }
3675                         }
3676                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3677                         sctp_m_freem(m);
3678                         return (EHOSTUNREACH);
3679                 }
3680                 if (ro != &iproute) {
3681                         memcpy(&iproute, ro, sizeof(*ro));
3682                 }
3683                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3684                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3685                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3686                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3687                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3688                     ro->ro_rt);
3689
3690                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3691                         /* failed to prepend data, give up */
3692                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3693                         sctp_m_freem(m);
3694                         return (ENOMEM);
3695                 }
3696 #ifdef  SCTP_PACKET_LOGGING
3697                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3698                         sctp_packet_log(m, packet_length);
3699 #endif
3700                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3701                 if (port) {
3702                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3703                             (stcb) &&
3704                             (stcb->asoc.loopback_scope))) {
3705                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3706                                 SCTP_STAT_INCR(sctps_sendswcrc);
3707                         } else {
3708                                 SCTP_STAT_INCR(sctps_sendnocrc);
3709                         }
3710                         SCTP_ENABLE_UDP_CSUM(o_pak);
3711                 } else {
3712                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3713                             (stcb) &&
3714                             (stcb->asoc.loopback_scope))) {
3715                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
3716                                 m->m_pkthdr.csum_data = 0;      /* FIXME MT */
3717                                 SCTP_STAT_INCR(sctps_sendhwcrc);
3718                         } else {
3719                                 SCTP_STAT_INCR(sctps_sendnocrc);
3720                         }
3721                 }
3722                 /* send it out.  table id is taken from stcb */
3723 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3724                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3725                         so = SCTP_INP_SO(inp);
3726                         SCTP_SOCKET_UNLOCK(so, 0);
3727                 }
3728 #endif
3729                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3730 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3731                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3732                         atomic_add_int(&stcb->asoc.refcnt, 1);
3733                         SCTP_TCB_UNLOCK(stcb);
3734                         SCTP_SOCKET_LOCK(so, 0);
3735                         SCTP_TCB_LOCK(stcb);
3736                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3737                 }
3738 #endif
3739                 SCTP_STAT_INCR(sctps_sendpackets);
3740                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3741                 if (ret)
3742                         SCTP_STAT_INCR(sctps_senderrors);
3743
3744                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3745                 if (net == NULL) {
3746                         /* free tempy routes */
3747                         if (ro->ro_rt) {
3748                                 RTFREE(ro->ro_rt);
3749                                 ro->ro_rt = NULL;
3750                         }
3751                 } else {
3752                         /* PMTU check versus smallest asoc MTU goes here */
3753                         if ((ro->ro_rt != NULL) &&
3754                             (net->ro._s_addr)) {
3755                                 uint32_t mtu;
3756
3757                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3758                                 if (net->port) {
3759                                         mtu -= sizeof(struct udphdr);
3760                                 }
3761                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3762 #ifdef SCTP_PRINT_FOR_B_AND_M
3763                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n", mtu);
3764 #endif
3765                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3766                                         net->mtu = mtu;
3767                                 }
3768                         } else if (ro->ro_rt == NULL) {
3769                                 /* route was freed */
3770                                 if (net->ro._s_addr &&
3771                                     net->src_addr_selected) {
3772                                         sctp_free_ifa(net->ro._s_addr);
3773                                         net->ro._s_addr = NULL;
3774                                 }
3775                                 net->src_addr_selected = 0;
3776                         }
3777                 }
3778                 return (ret);
3779         }
3780 #ifdef INET6
3781         else if (to->sa_family == AF_INET6) {
3782                 uint32_t flowlabel;
3783                 struct ip6_hdr *ip6h;
3784                 struct route_in6 ip6route;
3785                 struct ifnet *ifp;
3786                 u_char flowTop;
3787                 uint16_t flowBottom;
3788                 u_char tosBottom, tosTop;
3789                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3790                 int prev_scope = 0;
3791                 struct sockaddr_in6 lsa6_storage;
3792                 int error;
3793                 u_short prev_port = 0;
3794                 int len;
3795
3796                 if (net != NULL) {
3797                         flowlabel = net->tos_flowlabel;
3798                 } else {
3799                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3800                 }
3801
3802                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3803                 if (port) {
3804                         len += sizeof(struct udphdr);
3805                 }
3806                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3807                 if (newm == NULL) {
3808                         sctp_m_freem(m);
3809                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3810                         return (ENOMEM);
3811                 }
3812                 SCTP_ALIGN_TO_END(newm, len);
3813                 SCTP_BUF_LEN(newm) = len;
3814                 SCTP_BUF_NEXT(newm) = m;
3815                 m = newm;
3816                 packet_length = sctp_calculate_len(m);
3817
3818                 ip6h = mtod(m, struct ip6_hdr *);
3819                 /*
3820                  * We assume here that inp_flow is in host byte order within
3821                  * the TCB!
3822                  */
3823                 flowBottom = flowlabel & 0x0000ffff;
3824                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3825                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3826                 /* protect *sin6 from overwrite */
3827                 sin6 = (struct sockaddr_in6 *)to;
3828                 tmp = *sin6;
3829                 sin6 = &tmp;
3830
3831                 /* KAME hack: embed scopeid */
3832                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3833                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3834                         return (EINVAL);
3835                 }
3836                 if (net == NULL) {
3837                         memset(&ip6route, 0, sizeof(ip6route));
3838                         ro = (sctp_route_t *) & ip6route;
3839                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3840                 } else {
3841                         ro = (sctp_route_t *) & net->ro;
3842                 }
3843                 if (stcb != NULL) {
3844                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3845                                 /* Enable ECN */
3846                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3847                         } else {
3848                                 /* No ECN */
3849                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3850                         }
3851                 } else {
3852                         /* we could get no asoc if it is a O-O-T-B packet */
3853                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3854                 }
3855                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3856                 if (port) {
3857                         ip6h->ip6_nxt = IPPROTO_UDP;
3858                 } else {
3859                         ip6h->ip6_nxt = IPPROTO_SCTP;
3860                 }
3861                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3862                 ip6h->ip6_dst = sin6->sin6_addr;
3863
3864                 /*
3865                  * Add SRC address selection here: we can only reuse to a
3866                  * limited degree the kame src-addr-sel, since we can try
3867                  * their selection but it may not be bound.
3868                  */
3869                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3870                 lsa6_tmp.sin6_family = AF_INET6;
3871                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3872                 lsa6 = &lsa6_tmp;
3873                 if (net && out_of_asoc_ok == 0) {
3874                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3875                                 sctp_free_ifa(net->ro._s_addr);
3876                                 net->ro._s_addr = NULL;
3877                                 net->src_addr_selected = 0;
3878                                 if (ro->ro_rt) {
3879                                         RTFREE(ro->ro_rt);
3880                                         ro->ro_rt = NULL;
3881                                 }
3882                         }
3883                         if (net->src_addr_selected == 0) {
3884                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3885                                 /* KAME hack: embed scopeid */
3886                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3887                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3888                                         return (EINVAL);
3889                                 }
3890                                 /* Cache the source address */
3891                                 net->ro._s_addr = sctp_source_address_selection(inp,
3892                                     stcb,
3893                                     ro,
3894                                     net,
3895                                     0,
3896                                     vrf_id);
3897                                 (void)sa6_recoverscope(sin6);
3898                                 net->src_addr_selected = 1;
3899                         }
3900                         if (net->ro._s_addr == NULL) {
3901                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3902                                 net->src_addr_selected = 0;
3903                                 goto no_route;
3904                         }
3905                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3906                 } else {
3907                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3908                         /* KAME hack: embed scopeid */
3909                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3910                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3911                                 return (EINVAL);
3912                         }
3913                         if (over_addr == NULL) {
3914                                 struct sctp_ifa *_lsrc;
3915
3916                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3917                                     net,
3918                                     out_of_asoc_ok,
3919                                     vrf_id);
3920                                 if (_lsrc == NULL) {
3921                                         goto no_route;
3922                                 }
3923                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3924                                 sctp_free_ifa(_lsrc);
3925                         } else {
3926                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3927                                 SCTP_RTALLOC(ro, vrf_id);
3928                         }
3929                         (void)sa6_recoverscope(sin6);
3930                 }
3931                 lsa6->sin6_port = inp->sctp_lport;
3932
3933                 if (ro->ro_rt == NULL) {
3934                         /*
3935                          * src addr selection failed to find a route (or
3936                          * valid source addr), so we can't get there from
3937                          * here!
3938                          */
3939                         goto no_route;
3940                 }
3941                 /*
3942                  * XXX: sa6 may not have a valid sin6_scope_id in the
3943                  * non-SCOPEDROUTING case.
3944                  */
3945                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3946                 lsa6_storage.sin6_family = AF_INET6;
3947                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3948                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3949                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3950                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3951                         sctp_m_freem(m);
3952                         return (error);
3953                 }
3954                 /* XXX */
3955                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3956                 lsa6_storage.sin6_port = inp->sctp_lport;
3957                 lsa6 = &lsa6_storage;
3958                 ip6h->ip6_src = lsa6->sin6_addr;
3959
3960                 if (port) {
3961                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3962                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3963                         udp->uh_dport = port;
3964                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3965                         udp->uh_sum = 0;
3966                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3967                 } else {
3968                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3969                 }
3970
3971                 sctphdr->src_port = src_port;
3972                 sctphdr->dest_port = dest_port;
3973                 sctphdr->v_tag = v_tag;
3974                 sctphdr->checksum = 0;
3975
3976                 /*
3977                  * We set the hop limit now since there is a good chance
3978                  * that our ro pointer is now filled
3979                  */
3980                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3981                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3982
3983 #ifdef SCTP_DEBUG
3984                 /* Copy to be sure something bad is not happening */
3985                 sin6->sin6_addr = ip6h->ip6_dst;
3986                 lsa6->sin6_addr = ip6h->ip6_src;
3987 #endif
3988
3989                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3990                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3991                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3992                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3993                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3994                 if (net) {
3995                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3996                         /* preserve the port and scope for link local send */
3997                         prev_scope = sin6->sin6_scope_id;
3998                         prev_port = sin6->sin6_port;
3999                 }
4000                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4001                         /* failed to prepend data, give up */
4002                         sctp_m_freem(m);
4003                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4004                         return (ENOMEM);
4005                 }
4006 #ifdef  SCTP_PACKET_LOGGING
4007                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4008                         sctp_packet_log(m, packet_length);
4009 #endif
4010                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4011                 if (port) {
4012                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4013                             (stcb) &&
4014                             (stcb->asoc.loopback_scope))) {
4015                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4016                                 SCTP_STAT_INCR(sctps_sendswcrc);
4017                         } else {
4018                                 SCTP_STAT_INCR(sctps_sendnocrc);
4019                         }
4020                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4021                                 udp->uh_sum = 0xffff;
4022                         }
4023                 } else {
4024                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4025                             (stcb) &&
4026                             (stcb->asoc.loopback_scope))) {
4027                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4028                                 m->m_pkthdr.csum_data = 0;      /* FIXME MT */
4029                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4030                         } else {
4031                                 SCTP_STAT_INCR(sctps_sendnocrc);
4032                         }
4033                 }
4034                 /* send it out. table id is taken from stcb */
4035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4036                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4037                         so = SCTP_INP_SO(inp);
4038                         SCTP_SOCKET_UNLOCK(so, 0);
4039                 }
4040 #endif
4041                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4042 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4043                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4044                         atomic_add_int(&stcb->asoc.refcnt, 1);
4045                         SCTP_TCB_UNLOCK(stcb);
4046                         SCTP_SOCKET_LOCK(so, 0);
4047                         SCTP_TCB_LOCK(stcb);
4048                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4049                 }
4050 #endif
4051                 if (net) {
4052                         /* for link local this must be done */
4053                         sin6->sin6_scope_id = prev_scope;
4054                         sin6->sin6_port = prev_port;
4055                 }
4056                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4057                 SCTP_STAT_INCR(sctps_sendpackets);
4058                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4059                 if (ret) {
4060                         SCTP_STAT_INCR(sctps_senderrors);
4061                 }
4062                 if (net == NULL) {
4063                         /* Now if we had a temp route free it */
4064                         if (ro->ro_rt) {
4065                                 RTFREE(ro->ro_rt);
4066                         }
4067                 } else {
4068                         /* PMTU check versus smallest asoc MTU goes here */
4069                         if (ro->ro_rt == NULL) {
4070                                 /* Route was freed */
4071                                 if (net->ro._s_addr &&
4072                                     net->src_addr_selected) {
4073                                         sctp_free_ifa(net->ro._s_addr);
4074                                         net->ro._s_addr = NULL;
4075                                 }
4076                                 net->src_addr_selected = 0;
4077                         }
4078                         if ((ro->ro_rt != NULL) &&
4079                             (net->ro._s_addr)) {
4080                                 uint32_t mtu;
4081
4082                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4083                                 if (mtu &&
4084                                     (stcb->asoc.smallest_mtu > mtu)) {
4085 #ifdef SCTP_PRINT_FOR_B_AND_M
4086                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
4087                                             mtu);
4088 #endif
4089                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4090                                         net->mtu = mtu;
4091                                         if (net->port) {
4092                                                 net->mtu -= sizeof(struct udphdr);
4093                                         }
4094                                 }
4095                         } else if (ifp) {
4096                                 if (ND_IFINFO(ifp)->linkmtu &&
4097                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4098 #ifdef SCTP_PRINT_FOR_B_AND_M
4099                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
4100                                             ND_IFINFO(ifp)->linkmtu);
4101 #endif
4102                                         sctp_mtu_size_reset(inp,
4103                                             &stcb->asoc,
4104                                             ND_IFINFO(ifp)->linkmtu);
4105                                 }
4106                         }
4107                 }
4108                 return (ret);
4109         }
4110 #endif
4111         else {
4112                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4113                     ((struct sockaddr *)to)->sa_family);
4114                 sctp_m_freem(m);
4115                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4116                 return (EFAULT);
4117         }
4118 }
4119
4120
4121 void
4122 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4123 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4124     SCTP_UNUSED
4125 #endif
4126 )
4127 {
4128         struct mbuf *m, *m_at, *mp_last;
4129         struct sctp_nets *net;
4130         struct sctp_init_chunk *init;
4131         struct sctp_supported_addr_param *sup_addr;
4132         struct sctp_adaptation_layer_indication *ali;
4133         struct sctp_ecn_supported_param *ecn;
4134         struct sctp_prsctp_supported_param *prsctp;
4135         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4136         struct sctp_supported_chunk_types_param *pr_supported;
4137         int cnt_inits_to = 0;
4138         int padval, ret;
4139         int num_ext;
4140         int p_len;
4141
4142         /* INIT's always go to the primary (and usually ONLY address) */
4143         mp_last = NULL;
4144         net = stcb->asoc.primary_destination;
4145         if (net == NULL) {
4146                 net = TAILQ_FIRST(&stcb->asoc.nets);
4147                 if (net == NULL) {
4148                         /* TSNH */
4149                         return;
4150                 }
4151                 /* we confirm any address we send an INIT to */
4152                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4153                 (void)sctp_set_primary_addr(stcb, NULL, net);
4154         } else {
4155                 /* we confirm any address we send an INIT to */
4156                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4157         }
4158         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4159 #ifdef INET6
4160         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4161                 /*
4162                  * special hook, if we are sending to link local it will not
4163                  * show up in our private address count.
4164                  */
4165                 struct sockaddr_in6 *sin6l;
4166
4167                 sin6l = &net->ro._l_addr.sin6;
4168                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4169                         cnt_inits_to = 1;
4170         }
4171 #endif
4172         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4173                 /* This case should not happen */
4174                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4175                 return;
4176         }
4177         /* start the INIT timer */
4178         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4179
4180         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4181         if (m == NULL) {
4182                 /* No memory, INIT timer will re-attempt. */
4183                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4184                 return;
4185         }
4186         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4187         /*
4188          * assume peer supports asconf in order to be able to queue local
4189          * address changes while an INIT is in flight and before the assoc
4190          * is established.
4191          */
4192         stcb->asoc.peer_supports_asconf = 1;
4193         /* Now lets put the SCTP header in place */
4194         init = mtod(m, struct sctp_init_chunk *);
4195         /* now the chunk header */
4196         init->ch.chunk_type = SCTP_INITIATION;
4197         init->ch.chunk_flags = 0;
4198         /* fill in later from mbuf we build */
4199         init->ch.chunk_length = 0;
4200         /* place in my tag */
4201         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4202         /* set up some of the credits. */
4203         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4204             SCTP_MINIMAL_RWND));
4205
4206         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4207         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4208         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4209         /* now the address restriction */
4210         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4211             sizeof(*init));
4212         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4213 #ifdef INET6
4214         /* we support 2 types: IPv6/IPv4 */
4215         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4216         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4217         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4218 #else
4219         /* we support 1 type: IPv4 */
4220         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4221         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4222         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4223 #endif
4224         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4225         /* adaptation layer indication parameter */
4226         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4227         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4228         ali->ph.param_length = htons(sizeof(*ali));
4229         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4230         SCTP_BUF_LEN(m) += sizeof(*ali);
4231         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4232
4233         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4234                 /* Add NAT friendly parameter */
4235                 struct sctp_paramhdr *ph;
4236
4237                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4238                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4239                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4240                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4241                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4242         }
4243         /* now any cookie time extensions */
4244         if (stcb->asoc.cookie_preserve_req) {
4245                 struct sctp_cookie_perserve_param *cookie_preserve;
4246
4247                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4248                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4249                 cookie_preserve->ph.param_length = htons(
4250                     sizeof(*cookie_preserve));
4251                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4252                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4253                 ecn = (struct sctp_ecn_supported_param *)(
4254                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4255                 stcb->asoc.cookie_preserve_req = 0;
4256         }
4257         /* ECN parameter */
4258         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4259                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4260                 ecn->ph.param_length = htons(sizeof(*ecn));
4261                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4262                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4263                     sizeof(*ecn));
4264         } else {
4265                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4266         }
4267         /* And now tell the peer we do pr-sctp */
4268         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4269         prsctp->ph.param_length = htons(sizeof(*prsctp));
4270         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4271
4272         /* And now tell the peer we do all the extensions */
4273         pr_supported = (struct sctp_supported_chunk_types_param *)
4274             ((caddr_t)prsctp + sizeof(*prsctp));
4275         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4276         num_ext = 0;
4277         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4278         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4279         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4280         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4281         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4282         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4283                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4284         }
4285         /*
4286          * EY  if the initiator supports nr_sacks, need to report that to
4287          * responder in INIT chunk
4288          */
4289         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off)) {
4290                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4291         }
4292         p_len = sizeof(*pr_supported) + num_ext;
4293         pr_supported->ph.param_length = htons(p_len);
4294         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4295         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4296
4297
4298         /* ECN nonce: And now tell the peer we support ECN nonce */
4299         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4300                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4301                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4302                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4303                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4304                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4305         }
4306         /* add authentication parameters */
4307         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4308                 struct sctp_auth_random *randp;
4309                 struct sctp_auth_hmac_algo *hmacs;
4310                 struct sctp_auth_chunk_list *chunks;
4311
4312                 /* attach RANDOM parameter, if available */
4313                 if (stcb->asoc.authinfo.random != NULL) {
4314                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4315                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4316 #ifdef SCTP_AUTH_DRAFT_04
4317                         randp->ph.param_type = htons(SCTP_RANDOM);
4318                         randp->ph.param_length = htons(p_len);
4319                         bcopy(stcb->asoc.authinfo.random->key,
4320                             randp->random_data,
4321                             stcb->asoc.authinfo.random_len);
4322 #else
4323                         /* random key already contains the header */
4324                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4325 #endif
4326                         /* zero out any padding required */
4327                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4328                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4329                 }
4330                 /* add HMAC_ALGO parameter */
4331                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4332                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4333                     (uint8_t *) hmacs->hmac_ids);
4334                 if (p_len > 0) {
4335                         p_len += sizeof(*hmacs);
4336                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4337                         hmacs->ph.param_length = htons(p_len);
4338                         /* zero out any padding required */
4339                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4340                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4341                 }
4342                 /* add CHUNKS parameter */
4343                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4344                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4345                     chunks->chunk_types);
4346                 if (p_len > 0) {
4347                         p_len += sizeof(*chunks);
4348                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4349                         chunks->ph.param_length = htons(p_len);
4350                         /* zero out any padding required */
4351                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4352                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4353                 }
4354         }
4355         m_at = m;
4356         /* now the addresses */
4357         {
4358                 struct sctp_scoping scp;
4359
4360                 /*
4361                  * To optimize this we could put the scoping stuff into a
4362                  * structure and remove the individual uint8's from the
4363                  * assoc structure. Then we could just sifa in the address
4364                  * within the stcb.. but for now this is a quick hack to get
4365                  * the address stuff teased apart.
4366                  */
4367                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4368                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4369                 scp.loopback_scope = stcb->asoc.loopback_scope;
4370                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4371                 scp.local_scope = stcb->asoc.local_scope;
4372                 scp.site_scope = stcb->asoc.site_scope;
4373
4374                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4375         }
4376
4377         /* calulate the size and update pkt header and chunk header */
4378         p_len = 0;
4379         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4380                 if (SCTP_BUF_NEXT(m_at) == NULL)
4381                         mp_last = m_at;
4382                 p_len += SCTP_BUF_LEN(m_at);
4383         }
4384         init->ch.chunk_length = htons(p_len);
4385         /*
4386          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4387          * here since the timer will drive a retranmission.
4388          */
4389
4390         /* I don't expect this to execute but we will be safe here */
4391         padval = p_len % 4;
4392         if ((padval) && (mp_last)) {
4393                 /*
4394                  * The compiler worries that mp_last may not be set even
4395                  * though I think it is impossible :-> however we add
4396                  * mp_last here just in case.
4397                  */
4398                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4399                 if (ret) {
4400                         /* Houston we have a problem, no space */
4401                         sctp_m_freem(m);
4402                         return;
4403                 }
4404                 p_len += padval;
4405         }
4406         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4407         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4408             (struct sockaddr *)&net->ro._l_addr,
4409             m, 0, NULL, 0, 0, 0, NULL, 0,
4410             inp->sctp_lport, stcb->rport, htonl(0),
4411             net->port, so_locked, NULL);
4412         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4413         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4414         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4415 }
4416
4417 struct mbuf *
4418 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4419     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4420 {
4421         /*
4422          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4423          * being equal to the beginning of the params i.e. (iphlen +
4424          * sizeof(struct sctp_init_msg) parse through the parameters to the
4425          * end of the mbuf verifying that all parameters are known.
4426          *
4427          * For unknown parameters build and return a mbuf with
4428          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4429          * processing this chunk stop, and set *abort_processing to 1.
4430          *
4431          * By having param_offset be pre-set to where parameters begin it is
4432          * hoped that this routine may be reused in the future by new
4433          * features.
4434          */
4435         struct sctp_paramhdr *phdr, params;
4436
4437         struct mbuf *mat, *op_err;
4438         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4439         int at, limit, pad_needed;
4440         uint16_t ptype, plen, padded_size;
4441         int err_at;
4442
4443         *abort_processing = 0;
4444         mat = in_initpkt;
4445         err_at = 0;
4446         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4447         at = param_offset;
4448         op_err = NULL;
4449         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4450         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4451         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4452                 ptype = ntohs(phdr->param_type);
4453                 plen = ntohs(phdr->param_length);
4454                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4455                         /* wacked parameter */
4456                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4457                         goto invalid_size;
4458                 }
4459                 limit -= SCTP_SIZE32(plen);
4460                 /*-
4461                  * All parameters for all chunks that we know/understand are
4462                  * listed here. We process them other places and make
4463                  * appropriate stop actions per the upper bits. However this
4464                  * is the generic routine processor's can call to get back
4465                  * an operr.. to either incorporate (init-ack) or send.
4466                  */
4467                 padded_size = SCTP_SIZE32(plen);
4468                 switch (ptype) {
4469                         /* Param's with variable size */
4470                 case SCTP_HEARTBEAT_INFO:
4471                 case SCTP_STATE_COOKIE:
4472                 case SCTP_UNRECOG_PARAM:
4473                 case SCTP_ERROR_CAUSE_IND:
4474                         /* ok skip fwd */
4475                         at += padded_size;
4476                         break;
4477                         /* Param's with variable size within a range */
4478                 case SCTP_CHUNK_LIST:
4479                 case SCTP_SUPPORTED_CHUNK_EXT:
4480                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4481                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4482                                 goto invalid_size;
4483                         }
4484                         at += padded_size;
4485                         break;
4486                 case SCTP_SUPPORTED_ADDRTYPE:
4487                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4488                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4489                                 goto invalid_size;
4490                         }
4491                         at += padded_size;
4492                         break;
4493                 case SCTP_RANDOM:
4494                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4495                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4496                                 goto invalid_size;
4497                         }
4498                         at += padded_size;
4499                         break;
4500                 case SCTP_SET_PRIM_ADDR:
4501                 case SCTP_DEL_IP_ADDRESS:
4502                 case SCTP_ADD_IP_ADDRESS:
4503                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4504                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4505                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4506                                 goto invalid_size;
4507                         }
4508                         at += padded_size;
4509                         break;
4510                         /* Param's with a fixed size */
4511                 case SCTP_IPV4_ADDRESS:
4512                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4513                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4514                                 goto invalid_size;
4515                         }
4516                         at += padded_size;
4517                         break;
4518                 case SCTP_IPV6_ADDRESS:
4519                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4520                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4521                                 goto invalid_size;
4522                         }
4523                         at += padded_size;
4524                         break;
4525                 case SCTP_COOKIE_PRESERVE:
4526                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4527                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4528                                 goto invalid_size;
4529                         }
4530                         at += padded_size;
4531                         break;
4532                 case SCTP_HAS_NAT_SUPPORT:
4533                         *nat_friendly = 1;
4534                         /* fall through */
4535                 case SCTP_ECN_NONCE_SUPPORTED:
4536                 case SCTP_PRSCTP_SUPPORTED:
4537
4538                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4539                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4540                                 goto invalid_size;
4541                         }
4542                         at += padded_size;
4543                         break;
4544                 case SCTP_ECN_CAPABLE:
4545                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4546                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4547                                 goto invalid_size;
4548                         }
4549                         at += padded_size;
4550                         break;
4551                 case SCTP_ULP_ADAPTATION:
4552                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4553                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4554                                 goto invalid_size;
4555                         }
4556                         at += padded_size;
4557                         break;
4558                 case SCTP_SUCCESS_REPORT:
4559                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4560                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4561                                 goto invalid_size;
4562                         }
4563                         at += padded_size;
4564                         break;
4565                 case SCTP_HOSTNAME_ADDRESS:
4566                         {
4567                                 /* We can NOT handle HOST NAME addresses!! */
4568                                 int l_len;
4569
4570                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4571                                 *abort_processing = 1;
4572                                 if (op_err == NULL) {
4573                                         /* Ok need to try to get a mbuf */
4574 #ifdef INET6
4575                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4576 #else
4577                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4578 #endif
4579                                         l_len += plen;
4580                                         l_len += sizeof(struct sctp_paramhdr);
4581                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4582                                         if (op_err) {
4583                                                 SCTP_BUF_LEN(op_err) = 0;
4584                                                 /*
4585                                                  * pre-reserve space for ip
4586                                                  * and sctp header  and
4587                                                  * chunk hdr
4588                                                  */
4589 #ifdef INET6
4590                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4591 #else
4592                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4593 #endif
4594                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4595                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4596                                         }
4597                                 }
4598                                 if (op_err) {
4599                                         /* If we have space */
4600                                         struct sctp_paramhdr s;
4601
4602                                         if (err_at % 4) {
4603                                                 uint32_t cpthis = 0;
4604
4605                                                 pad_needed = 4 - (err_at % 4);
4606                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4607                                                 err_at += pad_needed;
4608                                         }
4609                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4610                                         s.param_length = htons(sizeof(s) + plen);
4611                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4612                                         err_at += sizeof(s);
4613                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4614                                         if (phdr == NULL) {
4615                                                 sctp_m_freem(op_err);
4616                                                 /*
4617                                                  * we are out of memory but
4618                                                  * we still need to have a
4619                                                  * look at what to do (the
4620                                                  * system is in trouble
4621                                                  * though).
4622                                                  */
4623                                                 return (NULL);
4624                                         }
4625                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4626                                         err_at += plen;
4627                                 }
4628                                 return (op_err);
4629                                 break;
4630                         }
4631                 default:
4632                         /*
4633                          * we do not recognize the parameter figure out what
4634                          * we do.
4635                          */
4636                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4637                         if ((ptype & 0x4000) == 0x4000) {
4638                                 /* Report bit is set?? */
4639                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4640                                 if (op_err == NULL) {
4641                                         int l_len;
4642
4643                                         /* Ok need to try to get an mbuf */
4644 #ifdef INET6
4645                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4646 #else
4647                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4648 #endif
4649                                         l_len += plen;
4650                                         l_len += sizeof(struct sctp_paramhdr);
4651                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4652                                         if (op_err) {
4653                                                 SCTP_BUF_LEN(op_err) = 0;
4654 #ifdef INET6
4655                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4656 #else
4657                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4658 #endif
4659                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4660                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4661                                         }
4662                                 }
4663                                 if (op_err) {
4664                                         /* If we have space */
4665                                         struct sctp_paramhdr s;
4666
4667                                         if (err_at % 4) {
4668                                                 uint32_t cpthis = 0;
4669
4670                                                 pad_needed = 4 - (err_at % 4);
4671                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4672                                                 err_at += pad_needed;
4673                                         }
4674                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4675                                         s.param_length = htons(sizeof(s) + plen);
4676                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4677                                         err_at += sizeof(s);
4678                                         if (plen > sizeof(tempbuf)) {
4679                                                 plen = sizeof(tempbuf);
4680                                         }
4681                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4682                                         if (phdr == NULL) {
4683                                                 sctp_m_freem(op_err);
4684                                                 /*
4685                                                  * we are out of memory but
4686                                                  * we still need to have a
4687                                                  * look at what to do (the
4688                                                  * system is in trouble
4689                                                  * though).
4690                                                  */
4691                                                 op_err = NULL;
4692                                                 goto more_processing;
4693                                         }
4694                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4695                                         err_at += plen;
4696                                 }
4697                         }
4698         more_processing:
4699                         if ((ptype & 0x8000) == 0x0000) {
4700                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4701                                 return (op_err);
4702                         } else {
4703                                 /* skip this chunk and continue processing */
4704                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4705                                 at += SCTP_SIZE32(plen);
4706                         }
4707                         break;
4708
4709                 }
4710                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4711         }
4712         return (op_err);
4713 invalid_size:
4714         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4715         *abort_processing = 1;
4716         if ((op_err == NULL) && phdr) {
4717                 int l_len;
4718
4719 #ifdef INET6
4720                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4721 #else
4722                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4723 #endif
4724                 l_len += (2 * sizeof(struct sctp_paramhdr));
4725                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4726                 if (op_err) {
4727                         SCTP_BUF_LEN(op_err) = 0;
4728 #ifdef INET6
4729                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4730 #else
4731                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4732 #endif
4733                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4734                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4735                 }
4736         }
4737         if ((op_err) && phdr) {
4738                 struct sctp_paramhdr s;
4739
4740                 if (err_at % 4) {
4741                         uint32_t cpthis = 0;
4742
4743                         pad_needed = 4 - (err_at % 4);
4744                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4745                         err_at += pad_needed;
4746                 }
4747                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4748                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4749                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4750                 err_at += sizeof(s);
4751                 /* Only copy back the p-hdr that caused the issue */
4752                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4753         }
4754         return (op_err);
4755 }
4756
4757 static int
4758 sctp_are_there_new_addresses(struct sctp_association *asoc,
4759     struct mbuf *in_initpkt, int iphlen, int offset)
4760 {
4761         /*
4762          * Given a INIT packet, look through the packet to verify that there
4763          * are NO new addresses. As we go through the parameters add reports
4764          * of any un-understood parameters that require an error.  Also we
4765          * must return (1) to drop the packet if we see a un-understood
4766          * parameter that tells us to drop the chunk.
4767          */
4768         struct sockaddr_in sin4, *sa4;
4769
4770 #ifdef INET6
4771         struct sockaddr_in6 sin6, *sa6;
4772
4773 #endif
4774         struct sockaddr *sa_touse;
4775         struct sockaddr *sa;
4776         struct sctp_paramhdr *phdr, params;
4777         struct ip *iph;
4778
4779 #ifdef INET6
4780         struct ip6_hdr *ip6h;
4781
4782 #endif
4783         struct mbuf *mat;
4784         uint16_t ptype, plen;
4785         int err_at;
4786         uint8_t fnd;
4787         struct sctp_nets *net;
4788
4789         memset(&sin4, 0, sizeof(sin4));
4790 #ifdef INET6
4791         memset(&sin6, 0, sizeof(sin6));
4792 #endif
4793         sin4.sin_family = AF_INET;
4794         sin4.sin_len = sizeof(sin4);
4795 #ifdef INET6
4796         sin6.sin6_family = AF_INET6;
4797         sin6.sin6_len = sizeof(sin6);
4798 #endif
4799         sa_touse = NULL;
4800         /* First what about the src address of the pkt ? */
4801         iph = mtod(in_initpkt, struct ip *);
4802         switch (iph->ip_v) {
4803         case IPVERSION:
4804                 /* source addr is IPv4 */
4805                 sin4.sin_addr = iph->ip_src;
4806                 sa_touse = (struct sockaddr *)&sin4;
4807                 break;
4808 #ifdef INET6
4809         case IPV6_VERSION >> 4:
4810                 /* source addr is IPv6 */
4811                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4812                 sin6.sin6_addr = ip6h->ip6_src;
4813                 sa_touse = (struct sockaddr *)&sin6;
4814                 break;
4815 #endif
4816         default:
4817                 return (1);
4818         }
4819
4820         fnd = 0;
4821         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4822                 sa = (struct sockaddr *)&net->ro._l_addr;
4823                 if (sa->sa_family == sa_touse->sa_family) {
4824                         if (sa->sa_family == AF_INET) {
4825                                 sa4 = (struct sockaddr_in *)sa;
4826                                 if (sa4->sin_addr.s_addr ==
4827                                     sin4.sin_addr.s_addr) {
4828                                         fnd = 1;
4829                                         break;
4830                                 }
4831                         }
4832 #ifdef INET6
4833                         if (sa->sa_family == AF_INET6) {
4834                                 sa6 = (struct sockaddr_in6 *)sa;
4835                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4836                                     &sin6)) {
4837                                         fnd = 1;
4838                                         break;
4839                                 }
4840                         }
4841 #endif
4842                 }
4843         }
4844         if (fnd == 0) {
4845                 /* New address added! no need to look futher. */
4846                 return (1);
4847         }
4848         /* Ok so far lets munge through the rest of the packet */
4849         mat = in_initpkt;
4850         err_at = 0;
4851         sa_touse = NULL;
4852         offset += sizeof(struct sctp_init_chunk);
4853         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4854         while (phdr) {
4855                 ptype = ntohs(phdr->param_type);
4856                 plen = ntohs(phdr->param_length);
4857                 if (ptype == SCTP_IPV4_ADDRESS) {
4858                         struct sctp_ipv4addr_param *p4, p4_buf;
4859
4860                         phdr = sctp_get_next_param(mat, offset,
4861                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4862                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4863                             phdr == NULL) {
4864                                 return (1);
4865                         }
4866                         p4 = (struct sctp_ipv4addr_param *)phdr;
4867                         sin4.sin_addr.s_addr = p4->addr;
4868                         sa_touse = (struct sockaddr *)&sin4;
4869                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4870                         struct sctp_ipv6addr_param *p6, p6_buf;
4871
4872                         phdr = sctp_get_next_param(mat, offset,
4873                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4874                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4875                             phdr == NULL) {
4876                                 return (1);
4877                         }
4878                         p6 = (struct sctp_ipv6addr_param *)phdr;
4879 #ifdef INET6
4880                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4881                             sizeof(p6->addr));
4882 #endif
4883                         sa_touse = (struct sockaddr *)&sin4;
4884                 }
4885                 if (sa_touse) {
4886                         /* ok, sa_touse points to one to check */
4887                         fnd = 0;
4888                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4889                                 sa = (struct sockaddr *)&net->ro._l_addr;
4890                                 if (sa->sa_family != sa_touse->sa_family) {
4891                                         continue;
4892                                 }
4893                                 if (sa->sa_family == AF_INET) {
4894                                         sa4 = (struct sockaddr_in *)sa;
4895                                         if (sa4->sin_addr.s_addr ==
4896                                             sin4.sin_addr.s_addr) {
4897                                                 fnd = 1;
4898                                                 break;
4899                                         }
4900                                 }
4901 #ifdef INET6
4902                                 if (sa->sa_family == AF_INET6) {
4903                                         sa6 = (struct sockaddr_in6 *)sa;
4904                                         if (SCTP6_ARE_ADDR_EQUAL(
4905                                             sa6, &sin6)) {
4906                                                 fnd = 1;
4907                                                 break;
4908                                         }
4909                                 }
4910 #endif
4911                         }
4912                         if (!fnd) {
4913                                 /* New addr added! no need to look further */
4914                                 return (1);
4915                         }
4916                 }
4917                 offset += SCTP_SIZE32(plen);
4918                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4919         }
4920         return (0);
4921 }
4922
4923 /*
4924  * Given a MBUF chain that was sent into us containing an INIT. Build a
4925  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4926  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4927  * message (i.e. the struct sctp_init_msg).
4928  */
4929 void
4930 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4931     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4932     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4933 {
4934         struct sctp_association *asoc;
4935         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4936         struct sctp_init_ack_chunk *initack;
4937         struct sctp_adaptation_layer_indication *ali;
4938         struct sctp_ecn_supported_param *ecn;
4939         struct sctp_prsctp_supported_param *prsctp;
4940         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4941         struct sctp_supported_chunk_types_param *pr_supported;
4942         union sctp_sockstore store, store1, *over_addr;
4943         struct sockaddr_in *sin, *to_sin;
4944
4945 #ifdef INET6
4946         struct sockaddr_in6 *sin6, *to_sin6;
4947
4948 #endif
4949         struct ip *iph;
4950
4951 #ifdef INET6
4952         struct ip6_hdr *ip6;
4953
4954 #endif
4955         struct sockaddr *to;
4956         struct sctp_state_cookie stc;
4957         struct sctp_nets *net = NULL;
4958         uint8_t *signature = NULL;
4959         int cnt_inits_to = 0;
4960         uint16_t his_limit, i_want;
4961         int abort_flag, padval;
4962         int num_ext;
4963         int p_len;
4964         int nat_friendly = 0;
4965         struct socket *so;
4966
4967         if (stcb)
4968                 asoc = &stcb->asoc;
4969         else
4970                 asoc = NULL;
4971         mp_last = NULL;
4972         if ((asoc != NULL) &&
4973             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4974             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4975                 /* new addresses, out of here in non-cookie-wait states */
4976                 /*
4977                  * Send a ABORT, we don't add the new address error clause
4978                  * though we even set the T bit and copy in the 0 tag.. this
4979                  * looks no different than if no listener was present.
4980                  */
4981                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4982                 return;
4983         }
4984         abort_flag = 0;
4985         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4986             (offset + sizeof(struct sctp_init_chunk)),
4987             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4988         if (abort_flag) {
4989 do_a_abort:
4990                 sctp_send_abort(init_pkt, iphlen, sh,
4991                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4992                 return;
4993         }
4994         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4995         if (m == NULL) {
4996                 /* No memory, INIT timer will re-attempt. */
4997                 if (op_err)
4998                         sctp_m_freem(op_err);
4999                 return;
5000         }
5001         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5002
5003         /* the time I built cookie */
5004         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5005
5006         /* populate any tie tags */
5007         if (asoc != NULL) {
5008                 /* unlock before tag selections */
5009                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5010                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5011                 stc.cookie_life = asoc->cookie_life;
5012                 net = asoc->primary_destination;
5013         } else {
5014                 stc.tie_tag_my_vtag = 0;
5015                 stc.tie_tag_peer_vtag = 0;
5016                 /* life I will award this cookie */
5017                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5018         }
5019
5020         /* copy in the ports for later check */
5021         stc.myport = sh->dest_port;
5022         stc.peerport = sh->src_port;
5023
5024         /*
5025          * If we wanted to honor cookie life extentions, we would add to
5026          * stc.cookie_life. For now we should NOT honor any extension
5027          */
5028         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5029         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5030                 struct inpcb *in_inp;
5031
5032                 /* Its a V6 socket */
5033                 in_inp = (struct inpcb *)inp;
5034                 stc.ipv6_addr_legal = 1;
5035                 /* Now look at the binding flag to see if V4 will be legal */
5036                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5037                         stc.ipv4_addr_legal = 1;
5038                 } else {
5039                         /* V4 addresses are NOT legal on the association */
5040                         stc.ipv4_addr_legal = 0;
5041                 }
5042         } else {
5043                 /* Its a V4 socket, no - V6 */
5044                 stc.ipv4_addr_legal = 1;
5045                 stc.ipv6_addr_legal = 0;
5046         }
5047
5048 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5049         stc.ipv4_scope = 1;
5050 #else
5051         stc.ipv4_scope = 0;
5052 #endif
5053         /* now for scope setup */
5054         memset((caddr_t)&store, 0, sizeof(store));
5055         memset((caddr_t)&store1, 0, sizeof(store1));
5056         sin = &store.sin;
5057         to_sin = &store1.sin;
5058 #ifdef INET6
5059         sin6 = &store.sin6;
5060         to_sin6 = &store1.sin6;
5061 #endif
5062         iph = mtod(init_pkt, struct ip *);
5063         /* establish the to_addr's */
5064         switch (iph->ip_v) {
5065         case IPVERSION:
5066                 to_sin->sin_port = sh->dest_port;
5067                 to_sin->sin_family = AF_INET;
5068                 to_sin->sin_len = sizeof(struct sockaddr_in);
5069                 to_sin->sin_addr = iph->ip_dst;
5070                 break;
5071 #ifdef INET6
5072         case IPV6_VERSION >> 4:
5073                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5074                 to_sin6->sin6_addr = ip6->ip6_dst;
5075                 to_sin6->sin6_scope_id = 0;
5076                 to_sin6->sin6_port = sh->dest_port;
5077                 to_sin6->sin6_family = AF_INET6;
5078                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5079                 break;
5080 #endif
5081         default:
5082                 goto do_a_abort;
5083                 break;
5084         };
5085
5086         if (net == NULL) {
5087                 to = (struct sockaddr *)&store;
5088                 switch (iph->ip_v) {
5089                 case IPVERSION:
5090                         {
5091                                 sin->sin_family = AF_INET;
5092                                 sin->sin_len = sizeof(struct sockaddr_in);
5093                                 sin->sin_port = sh->src_port;
5094                                 sin->sin_addr = iph->ip_src;
5095                                 /* lookup address */
5096                                 stc.address[0] = sin->sin_addr.s_addr;
5097                                 stc.address[1] = 0;
5098                                 stc.address[2] = 0;
5099                                 stc.address[3] = 0;
5100                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5101                                 /* local from address */
5102                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5103                                 stc.laddress[1] = 0;
5104                                 stc.laddress[2] = 0;
5105                                 stc.laddress[3] = 0;
5106                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5107                                 /* scope_id is only for v6 */
5108                                 stc.scope_id = 0;
5109 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5110                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5111                                         stc.ipv4_scope = 1;
5112                                 }
5113 #else
5114                                 stc.ipv4_scope = 1;
5115 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5116                                 /* Must use the address in this case */
5117                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5118                                         stc.loopback_scope = 1;
5119                                         stc.ipv4_scope = 1;
5120                                         stc.site_scope = 1;
5121                                         stc.local_scope = 0;
5122                                 }
5123                                 break;
5124                         }
5125 #ifdef INET6
5126                 case IPV6_VERSION >> 4:
5127                         {
5128                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5129                                 sin6->sin6_family = AF_INET6;
5130                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5131                                 sin6->sin6_port = sh->src_port;
5132                                 sin6->sin6_addr = ip6->ip6_src;
5133                                 /* lookup address */
5134                                 memcpy(&stc.address, &sin6->sin6_addr,
5135                                     sizeof(struct in6_addr));
5136                                 sin6->sin6_scope_id = 0;
5137                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5138                                 stc.scope_id = 0;
5139                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5140                                         /*
5141                                          * FIX ME: does this have scope from
5142                                          * rcvif?
5143                                          */
5144                                         (void)sa6_recoverscope(sin6);
5145                                         stc.scope_id = sin6->sin6_scope_id;
5146                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5147                                         stc.loopback_scope = 1;
5148                                         stc.local_scope = 0;
5149                                         stc.site_scope = 1;
5150                                         stc.ipv4_scope = 1;
5151                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5152                                         /*
5153                                          * If the new destination is a
5154                                          * LINK_LOCAL we must have common
5155                                          * both site and local scope. Don't
5156                                          * set local scope though since we
5157                                          * must depend on the source to be
5158                                          * added implicitly. We cannot
5159                                          * assure just because we share one
5160                                          * link that all links are common.
5161                                          */
5162                                         stc.local_scope = 0;
5163                                         stc.site_scope = 1;
5164                                         stc.ipv4_scope = 1;
5165                                         /*
5166                                          * we start counting for the private
5167                                          * address stuff at 1. since the
5168                                          * link local we source from won't
5169                                          * show up in our scoped count.
5170                                          */
5171                                         cnt_inits_to = 1;
5172                                         /*
5173                                          * pull out the scope_id from
5174                                          * incoming pkt
5175                                          */
5176                                         /*
5177                                          * FIX ME: does this have scope from
5178                                          * rcvif?
5179                                          */
5180                                         (void)sa6_recoverscope(sin6);
5181                                         stc.scope_id = sin6->sin6_scope_id;
5182                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5183                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5184                                         /*
5185                                          * If the new destination is
5186                                          * SITE_LOCAL then we must have site
5187                                          * scope in common.
5188                                          */
5189                                         stc.site_scope = 1;
5190                                 }
5191                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5192                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5193                                 break;
5194                         }
5195 #endif
5196                 default:
5197                         /* TSNH */
5198                         goto do_a_abort;
5199                         break;
5200                 }
5201         } else {
5202                 /* set the scope per the existing tcb */
5203
5204 #ifdef INET6
5205                 struct sctp_nets *lnet;
5206
5207 #endif
5208
5209                 stc.loopback_scope = asoc->loopback_scope;
5210                 stc.ipv4_scope = asoc->ipv4_local_scope;
5211                 stc.site_scope = asoc->site_scope;
5212                 stc.local_scope = asoc->local_scope;
5213 #ifdef INET6
5214                 /* Why do we not consider IPv4 LL addresses? */
5215                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5216                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5217                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5218                                         /*
5219                                          * if we have a LL address, start
5220                                          * counting at 1.
5221                                          */
5222                                         cnt_inits_to = 1;
5223                                 }
5224                         }
5225                 }
5226 #endif
5227                 /* use the net pointer */
5228                 to = (struct sockaddr *)&net->ro._l_addr;
5229                 switch (to->sa_family) {
5230                 case AF_INET:
5231                         sin = (struct sockaddr_in *)to;
5232                         stc.address[0] = sin->sin_addr.s_addr;
5233                         stc.address[1] = 0;
5234                         stc.address[2] = 0;
5235                         stc.address[3] = 0;
5236                         stc.addr_type = SCTP_IPV4_ADDRESS;
5237                         if (net->src_addr_selected == 0) {
5238                                 /*
5239                                  * strange case here, the INIT should have
5240                                  * did the selection.
5241                                  */
5242                                 net->ro._s_addr = sctp_source_address_selection(inp,
5243                                     stcb, (sctp_route_t *) & net->ro,
5244                                     net, 0, vrf_id);
5245                                 if (net->ro._s_addr == NULL)
5246                                         return;
5247
5248                                 net->src_addr_selected = 1;
5249
5250                         }
5251                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5252                         stc.laddress[1] = 0;
5253                         stc.laddress[2] = 0;
5254                         stc.laddress[3] = 0;
5255                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5256                         break;
5257 #ifdef INET6
5258                 case AF_INET6:
5259                         sin6 = (struct sockaddr_in6 *)to;
5260                         memcpy(&stc.address, &sin6->sin6_addr,
5261                             sizeof(struct in6_addr));
5262                         stc.addr_type = SCTP_IPV6_ADDRESS;
5263                         if (net->src_addr_selected == 0) {
5264                                 /*
5265                                  * strange case here, the INIT should have
5266                                  * did the selection.
5267                                  */
5268                                 net->ro._s_addr = sctp_source_address_selection(inp,
5269                                     stcb, (sctp_route_t *) & net->ro,
5270                                     net, 0, vrf_id);
5271                                 if (net->ro._s_addr == NULL)
5272                                         return;
5273
5274                                 net->src_addr_selected = 1;
5275                         }
5276                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5277                             sizeof(struct in6_addr));
5278                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5279                         break;
5280 #endif
5281                 }
5282         }
5283         /* Now lets put the SCTP header in place */
5284         initack = mtod(m, struct sctp_init_ack_chunk *);
5285         /* Save it off for quick ref */
5286         stc.peers_vtag = init_chk->init.initiate_tag;
5287         /* who are we */
5288         memcpy(stc.identification, SCTP_VERSION_STRING,
5289             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5290         /* now the chunk header */
5291         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5292         initack->ch.chunk_flags = 0;
5293         /* fill in later from mbuf we build */
5294         initack->ch.chunk_length = 0;
5295         /* place in my tag */
5296         if ((asoc != NULL) &&
5297             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5298             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5299             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5300                 /* re-use the v-tags and init-seq here */
5301                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5302                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5303         } else {
5304                 uint32_t vtag, itsn;
5305
5306                 if (hold_inp_lock) {
5307                         SCTP_INP_INCR_REF(inp);
5308                         SCTP_INP_RUNLOCK(inp);
5309                 }
5310                 if (asoc) {
5311                         atomic_add_int(&asoc->refcnt, 1);
5312                         SCTP_TCB_UNLOCK(stcb);
5313         new_tag:
5314                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5315                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5316                                 /*
5317                                  * Got a duplicate vtag on some guy behind a
5318                                  * nat make sure we don't use it.
5319                                  */
5320                                 goto new_tag;
5321                         }
5322                         initack->init.initiate_tag = htonl(vtag);
5323                         /* get a TSN to use too */
5324                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5325                         initack->init.initial_tsn = htonl(itsn);
5326                         SCTP_TCB_LOCK(stcb);
5327                         atomic_add_int(&asoc->refcnt, -1);
5328                 } else {
5329                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5330                         initack->init.initiate_tag = htonl(vtag);
5331                         /* get a TSN to use too */
5332                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5333                 }
5334                 if (hold_inp_lock) {
5335                         SCTP_INP_RLOCK(inp);
5336                         SCTP_INP_DECR_REF(inp);
5337                 }
5338         }
5339         /* save away my tag to */
5340         stc.my_vtag = initack->init.initiate_tag;
5341
5342         /* set up some of the credits. */
5343         so = inp->sctp_socket;
5344         if (so == NULL) {
5345                 /* memory problem */
5346                 sctp_m_freem(m);
5347                 return;
5348         } else {
5349                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5350         }
5351         /* set what I want */
5352         his_limit = ntohs(init_chk->init.num_inbound_streams);
5353         /* choose what I want */
5354         if (asoc != NULL) {
5355                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5356                         i_want = asoc->streamoutcnt;
5357                 } else {
5358                         i_want = inp->sctp_ep.pre_open_stream_count;
5359                 }
5360         } else {
5361                 i_want = inp->sctp_ep.pre_open_stream_count;
5362         }
5363         if (his_limit < i_want) {
5364                 /* I Want more :< */
5365                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5366         } else {
5367                 /* I can have what I want :> */
5368                 initack->init.num_outbound_streams = htons(i_want);
5369         }
5370         /* tell him his limt. */
5371         initack->init.num_inbound_streams =
5372             htons(inp->sctp_ep.max_open_streams_intome);
5373
5374         /* adaptation layer indication parameter */
5375         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5376         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5377         ali->ph.param_length = htons(sizeof(*ali));
5378         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5379         SCTP_BUF_LEN(m) += sizeof(*ali);
5380         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5381
5382         /* ECN parameter */
5383         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5384                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5385                 ecn->ph.param_length = htons(sizeof(*ecn));
5386                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5387
5388                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5389                     sizeof(*ecn));
5390         } else {
5391                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5392         }
5393         /* And now tell the peer we do  pr-sctp */
5394         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5395         prsctp->ph.param_length = htons(sizeof(*prsctp));
5396         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5397         if (nat_friendly) {
5398                 /* Add NAT friendly parameter */
5399                 struct sctp_paramhdr *ph;
5400
5401                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5402                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5403                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5404                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5405         }
5406         /* And now tell the peer we do all the extensions */
5407         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5408         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5409         num_ext = 0;
5410         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5411         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5412         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5413         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5414         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5415         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5416                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5417         /*
5418          * EY  if the sysctl variable is set, tell the assoc. initiator that
5419          * we do nr_sack
5420          */
5421         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5422                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5423         p_len = sizeof(*pr_supported) + num_ext;
5424         pr_supported->ph.param_length = htons(p_len);
5425         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5426         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5427
5428         /* ECN nonce: And now tell the peer we support ECN nonce */
5429         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5430                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5431                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5432                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5433                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5434                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5435         }
5436         /* add authentication parameters */
5437         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5438                 struct sctp_auth_random *randp;
5439                 struct sctp_auth_hmac_algo *hmacs;
5440                 struct sctp_auth_chunk_list *chunks;
5441                 uint16_t random_len;
5442
5443                 /* generate and add RANDOM parameter */
5444                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5445                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5446                 randp->ph.param_type = htons(SCTP_RANDOM);
5447                 p_len = sizeof(*randp) + random_len;
5448                 randp->ph.param_length = htons(p_len);
5449                 SCTP_READ_RANDOM(randp->random_data, random_len);
5450                 /* zero out any padding required */
5451                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5452                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5453
5454                 /* add HMAC_ALGO parameter */
5455                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5456                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5457                     (uint8_t *) hmacs->hmac_ids);
5458                 if (p_len > 0) {
5459                         p_len += sizeof(*hmacs);
5460                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5461                         hmacs->ph.param_length = htons(p_len);
5462                         /* zero out any padding required */
5463                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5464                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5465                 }
5466                 /* add CHUNKS parameter */
5467                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5468                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5469                     chunks->chunk_types);
5470                 if (p_len > 0) {
5471                         p_len += sizeof(*chunks);
5472                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5473                         chunks->ph.param_length = htons(p_len);
5474                         /* zero out any padding required */
5475                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5476                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5477                 }
5478         }
5479         m_at = m;
5480         /* now the addresses */
5481         {
5482                 struct sctp_scoping scp;
5483
5484                 /*
5485                  * To optimize this we could put the scoping stuff into a
5486                  * structure and remove the individual uint8's from the stc
5487                  * structure. Then we could just sifa in the address within
5488                  * the stc.. but for now this is a quick hack to get the
5489                  * address stuff teased apart.
5490                  */
5491                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5492                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5493                 scp.loopback_scope = stc.loopback_scope;
5494                 scp.ipv4_local_scope = stc.ipv4_scope;
5495                 scp.local_scope = stc.local_scope;
5496                 scp.site_scope = stc.site_scope;
5497                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5498         }
5499
5500         /* tack on the operational error if present */
5501         if (op_err) {
5502                 struct mbuf *ol;
5503                 int llen;
5504
5505                 llen = 0;
5506                 ol = op_err;
5507                 while (ol) {
5508                         llen += SCTP_BUF_LEN(ol);
5509                         ol = SCTP_BUF_NEXT(ol);
5510                 }
5511                 if (llen % 4) {
5512                         /* must add a pad to the param */
5513                         uint32_t cpthis = 0;
5514                         int padlen;
5515
5516                         padlen = 4 - (llen % 4);
5517                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5518                 }
5519                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5520                         m_at = SCTP_BUF_NEXT(m_at);
5521                 }
5522                 SCTP_BUF_NEXT(m_at) = op_err;
5523                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5524                         m_at = SCTP_BUF_NEXT(m_at);
5525                 }
5526         }
5527         /* pre-calulate the size and update pkt header and chunk header */
5528         p_len = 0;
5529         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5530                 p_len += SCTP_BUF_LEN(m_tmp);
5531                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5532                         /* m_tmp should now point to last one */
5533                         break;
5534                 }
5535         }
5536
5537         /* Now we must build a cookie */
5538         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5539         if (m_cookie == NULL) {
5540                 /* memory problem */
5541                 sctp_m_freem(m);
5542                 return;
5543         }
5544         /* Now append the cookie to the end and update the space/size */
5545         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5546
5547         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5548                 p_len += SCTP_BUF_LEN(m_tmp);
5549                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5550                         /* m_tmp should now point to last one */
5551                         mp_last = m_tmp;
5552                         break;
5553                 }
5554         }
5555         /*
5556          * Place in the size, but we don't include the last pad (if any) in
5557          * the INIT-ACK.
5558          */
5559         initack->ch.chunk_length = htons(p_len);
5560
5561         /*
5562          * Time to sign the cookie, we don't sign over the cookie signature
5563          * though thus we set trailer.
5564          */
5565         (void)sctp_hmac_m(SCTP_HMAC,
5566             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5567             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5568             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5569         /*
5570          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5571          * here since the timer will drive a retranmission.
5572          */
5573         padval = p_len % 4;
5574         if ((padval) && (mp_last)) {
5575                 /* see my previous comments on mp_last */
5576                 int ret;
5577
5578                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5579                 if (ret) {
5580                         /* Houston we have a problem, no space */
5581                         sctp_m_freem(m);
5582                         return;
5583                 }
5584                 p_len += padval;
5585         }
5586         if (stc.loopback_scope) {
5587                 over_addr = &store1;
5588         } else {
5589                 over_addr = NULL;
5590         }
5591
5592         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5593             0, NULL, 0,
5594             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5595             port, SCTP_SO_NOT_LOCKED, over_addr);
5596         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5597 }
5598
5599
5600 void
5601 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5602     struct sctp_association *asoc,
5603     struct sctp_stream_out *strq, int holds_lock)
5604 {
5605         if (holds_lock == 0) {
5606                 SCTP_TCB_SEND_LOCK(stcb);
5607         }
5608         if ((strq->next_spoke.tqe_next) ||
5609             (strq->next_spoke.tqe_prev)) {
5610                 /* already on wheel */
5611                 goto outof_here;
5612         }
5613         TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5614 outof_here:
5615         if (holds_lock == 0) {
5616                 SCTP_TCB_SEND_UNLOCK(stcb);
5617         }
5618 }
5619
5620 void
5621 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5622     struct sctp_association *asoc,
5623     struct sctp_stream_out *strq,
5624     int holds_lock)
5625 {
5626         /* take off and then setup so we know it is not on the wheel */
5627         if (holds_lock == 0)
5628                 SCTP_TCB_SEND_LOCK(stcb);
5629         if (TAILQ_FIRST(&strq->outqueue)) {
5630                 /* more was added */
5631                 if (holds_lock == 0)
5632                         SCTP_TCB_SEND_UNLOCK(stcb);
5633                 return;
5634         }
5635         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5636         strq->next_spoke.tqe_next = NULL;
5637         strq->next_spoke.tqe_prev = NULL;
5638         if (holds_lock == 0)
5639                 SCTP_TCB_SEND_UNLOCK(stcb);
5640 }
5641
5642 static void
5643 sctp_prune_prsctp(struct sctp_tcb *stcb,
5644     struct sctp_association *asoc,
5645     struct sctp_sndrcvinfo *srcv,
5646     int dataout)
5647 {
5648         int freed_spc = 0;
5649         struct sctp_tmit_chunk *chk, *nchk;
5650
5651         SCTP_TCB_LOCK_ASSERT(stcb);
5652         if ((asoc->peer_supports_prsctp) &&
5653             (asoc->sent_queue_cnt_removeable > 0)) {
5654                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5655                         /*
5656                          * Look for chunks marked with the PR_SCTP flag AND
5657                          * the buffer space flag. If the one being sent is
5658                          * equal or greater priority then purge the old one
5659                          * and free some space.
5660                          */
5661                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5662                                 /*
5663                                  * This one is PR-SCTP AND buffer space
5664                                  * limited type
5665                                  */
5666                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5667                                         /*
5668                                          * Lower numbers equates to higher
5669                                          * priority so if the one we are
5670                                          * looking at has a larger or equal
5671                                          * priority we want to drop the data
5672                                          * and NOT retransmit it.
5673                                          */
5674                                         if (chk->data) {
5675                                                 /*
5676                                                  * We release the book_size
5677                                                  * if the mbuf is here
5678                                                  */
5679                                                 int ret_spc;
5680                                                 int cause;
5681
5682                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5683                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5684                                                 else
5685                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5686                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5687                                                     cause,
5688                                                     SCTP_SO_LOCKED);
5689                                                 freed_spc += ret_spc;
5690                                                 if (freed_spc >= dataout) {
5691                                                         return;
5692                                                 }
5693                                         }       /* if chunk was present */
5694                                 }       /* if of sufficent priority */
5695                         }       /* if chunk has enabled */
5696                 }               /* tailqforeach */
5697
5698                 chk = TAILQ_FIRST(&asoc->send_queue);
5699                 while (chk) {
5700                         nchk = TAILQ_NEXT(chk, sctp_next);
5701                         /* Here we must move to the sent queue and mark */
5702                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5703                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5704                                         if (chk->data) {
5705                                                 /*
5706                                                  * We release the book_size
5707                                                  * if the mbuf is here
5708                                                  */
5709                                                 int ret_spc;
5710
5711                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5712                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5713                                                     SCTP_SO_LOCKED);
5714
5715                                                 freed_spc += ret_spc;
5716                                                 if (freed_spc >= dataout) {
5717                                                         return;
5718                                                 }
5719                                         }       /* end if chk->data */
5720                                 }       /* end if right class */
5721                         }       /* end if chk pr-sctp */
5722                         chk = nchk;
5723                 }               /* end while (chk) */
5724         }                       /* if enabled in asoc */
5725 }
5726
5727 int
5728 sctp_get_frag_point(struct sctp_tcb *stcb,
5729     struct sctp_association *asoc)
5730 {
5731         int siz, ovh;
5732
5733         /*
5734          * For endpoints that have both v6 and v4 addresses we must reserve
5735          * room for the ipv6 header, for those that are only dealing with V4
5736          * we use a larger frag point.
5737          */
5738         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5739                 ovh = SCTP_MED_OVERHEAD;
5740         } else {
5741                 ovh = SCTP_MED_V4_OVERHEAD;
5742         }
5743
5744         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5745                 siz = asoc->smallest_mtu - ovh;
5746         else
5747                 siz = (stcb->asoc.sctp_frag_point - ovh);
5748         /*
5749          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5750          */
5751         /* A data chunk MUST fit in a cluster */
5752         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5753         /* } */
5754
5755         /* adjust for an AUTH chunk if DATA requires auth */
5756         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5757                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5758
5759         if (siz % 4) {
5760                 /* make it an even word boundary please */
5761                 siz -= (siz % 4);
5762         }
5763         return (siz);
5764 }
5765
5766 static void
5767 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5768 {
5769         sp->pr_sctp_on = 0;
5770         /*
5771          * We assume that the user wants PR_SCTP_TTL if the user provides a
5772          * positive lifetime but does not specify any PR_SCTP policy. This
5773          * is a BAD assumption and causes problems at least with the
5774          * U-Vancovers MPI folks. I will change this to be no policy means
5775          * NO PR-SCTP.
5776          */
5777         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5778                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5779                 sp->pr_sctp_on = 1;
5780         } else {
5781                 return;
5782         }
5783         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5784         case CHUNK_FLAGS_PR_SCTP_BUF:
5785                 /*
5786                  * Time to live is a priority stored in tv_sec when doing
5787                  * the buffer drop thing.
5788                  */
5789                 sp->ts.tv_sec = sp->timetolive;
5790                 sp->ts.tv_usec = 0;
5791                 break;
5792         case CHUNK_FLAGS_PR_SCTP_TTL:
5793                 {
5794                         struct timeval tv;
5795
5796                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5797                         tv.tv_sec = sp->timetolive / 1000;
5798                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5799                         /*
5800                          * TODO sctp_constants.h needs alternative time
5801                          * macros when _KERNEL is undefined.
5802                          */
5803                         timevaladd(&sp->ts, &tv);
5804                 }
5805                 break;
5806         case CHUNK_FLAGS_PR_SCTP_RTX:
5807                 /*
5808                  * Time to live is a the number or retransmissions stored in
5809                  * tv_sec.
5810                  */
5811                 sp->ts.tv_sec = sp->timetolive;
5812                 sp->ts.tv_usec = 0;
5813                 break;
5814         default:
5815                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5816                     "Unknown PR_SCTP policy %u.\n",
5817                     PR_SCTP_POLICY(sp->sinfo_flags));
5818                 break;
5819         }
5820 }
5821
5822 static int
5823 sctp_msg_append(struct sctp_tcb *stcb,
5824     struct sctp_nets *net,
5825     struct mbuf *m,
5826     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5827 {
5828         int error = 0, holds_lock;
5829         struct mbuf *at;
5830         struct sctp_stream_queue_pending *sp = NULL;
5831         struct sctp_stream_out *strm;
5832
5833         /*
5834          * Given an mbuf chain, put it into the association send queue and
5835          * place it on the wheel
5836          */
5837         holds_lock = hold_stcb_lock;
5838         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5839                 /* Invalid stream number */
5840                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5841                 error = EINVAL;
5842                 goto out_now;
5843         }
5844         if ((stcb->asoc.stream_locked) &&
5845             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5846                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5847                 error = EINVAL;
5848                 goto out_now;
5849         }
5850         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5851         /* Now can we send this? */
5852         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5853             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5854             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5855             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5856                 /* got data while shutting down */
5857                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5858                 error = ECONNRESET;
5859                 goto out_now;
5860         }
5861         sctp_alloc_a_strmoq(stcb, sp);
5862         if (sp == NULL) {
5863                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5864                 error = ENOMEM;
5865                 goto out_now;
5866         }
5867         sp->sinfo_flags = srcv->sinfo_flags;
5868         sp->timetolive = srcv->sinfo_timetolive;
5869         sp->ppid = srcv->sinfo_ppid;
5870         sp->context = srcv->sinfo_context;
5871         sp->strseq = 0;
5872         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5873                 sp->net = net;
5874                 sp->addr_over = 1;
5875         } else {
5876                 sp->net = stcb->asoc.primary_destination;
5877                 sp->addr_over = 0;
5878         }
5879         atomic_add_int(&sp->net->ref_count, 1);
5880         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5881         sp->stream = srcv->sinfo_stream;
5882         sp->msg_is_complete = 1;
5883         sp->sender_all_done = 1;
5884         sp->some_taken = 0;
5885         sp->data = m;
5886         sp->tail_mbuf = NULL;
5887         sp->length = 0;
5888         at = m;
5889         sctp_set_prsctp_policy(sp);
5890         /*
5891          * We could in theory (for sendall) sifa the length in, but we would
5892          * still have to hunt through the chain since we need to setup the
5893          * tail_mbuf
5894          */
5895         while (at) {
5896                 if (SCTP_BUF_NEXT(at) == NULL)
5897                         sp->tail_mbuf = at;
5898                 sp->length += SCTP_BUF_LEN(at);
5899                 at = SCTP_BUF_NEXT(at);
5900         }
5901         SCTP_TCB_SEND_LOCK(stcb);
5902         sctp_snd_sb_alloc(stcb, sp->length);
5903         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5904         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5905         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5906                 sp->strseq = strm->next_sequence_sent;
5907                 strm->next_sequence_sent++;
5908         }
5909         if ((strm->next_spoke.tqe_next == NULL) &&
5910             (strm->next_spoke.tqe_prev == NULL)) {
5911                 /* Not on wheel, insert */
5912                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5913         }
5914         m = NULL;
5915         SCTP_TCB_SEND_UNLOCK(stcb);
5916 out_now:
5917         if (m) {
5918                 sctp_m_freem(m);
5919         }
5920         return (error);
5921 }
5922
5923
5924 static struct mbuf *
5925 sctp_copy_mbufchain(struct mbuf *clonechain,
5926     struct mbuf *outchain,
5927     struct mbuf **endofchain,
5928     int can_take_mbuf,
5929     int sizeofcpy,
5930     uint8_t copy_by_ref)
5931 {
5932         struct mbuf *m;
5933         struct mbuf *appendchain;
5934         caddr_t cp;
5935         int len;
5936
5937         if (endofchain == NULL) {
5938                 /* error */
5939 error_out:
5940                 if (outchain)
5941                         sctp_m_freem(outchain);
5942                 return (NULL);
5943         }
5944         if (can_take_mbuf) {
5945                 appendchain = clonechain;
5946         } else {
5947                 if (!copy_by_ref &&
5948                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5949                     ) {
5950                         /* Its not in a cluster */
5951                         if (*endofchain == NULL) {
5952                                 /* lets get a mbuf cluster */
5953                                 if (outchain == NULL) {
5954                                         /* This is the general case */
5955                         new_mbuf:
5956                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5957                                         if (outchain == NULL) {
5958                                                 goto error_out;
5959                                         }
5960                                         SCTP_BUF_LEN(outchain) = 0;
5961                                         *endofchain = outchain;
5962                                         /* get the prepend space */
5963                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5964                                 } else {
5965                                         /*
5966                                          * We really should not get a NULL
5967                                          * in endofchain
5968                                          */
5969                                         /* find end */
5970                                         m = outchain;
5971                                         while (m) {
5972                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5973                                                         *endofchain = m;
5974                                                         break;
5975                                                 }
5976                                                 m = SCTP_BUF_NEXT(m);
5977                                         }
5978                                         /* sanity */
5979                                         if (*endofchain == NULL) {
5980                                                 /*
5981                                                  * huh, TSNH XXX maybe we
5982                                                  * should panic
5983                                                  */
5984                                                 sctp_m_freem(outchain);
5985                                                 goto new_mbuf;
5986                                         }
5987                                 }
5988                                 /* get the new end of length */
5989                                 len = M_TRAILINGSPACE(*endofchain);
5990                         } else {
5991                                 /* how much is left at the end? */
5992                                 len = M_TRAILINGSPACE(*endofchain);
5993                         }
5994                         /* Find the end of the data, for appending */
5995                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5996
5997                         /* Now lets copy it out */
5998                         if (len >= sizeofcpy) {
5999                                 /* It all fits, copy it in */
6000                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6001                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6002                         } else {
6003                                 /* fill up the end of the chain */
6004                                 if (len > 0) {
6005                                         m_copydata(clonechain, 0, len, cp);
6006                                         SCTP_BUF_LEN((*endofchain)) += len;
6007                                         /* now we need another one */
6008                                         sizeofcpy -= len;
6009                                 }
6010                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6011                                 if (m == NULL) {
6012                                         /* We failed */
6013                                         goto error_out;
6014                                 }
6015                                 SCTP_BUF_NEXT((*endofchain)) = m;
6016                                 *endofchain = m;
6017                                 cp = mtod((*endofchain), caddr_t);
6018                                 m_copydata(clonechain, len, sizeofcpy, cp);
6019                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6020                         }
6021                         return (outchain);
6022                 } else {
6023                         /* copy the old fashion way */
6024                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6025 #ifdef SCTP_MBUF_LOGGING
6026                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6027                                 struct mbuf *mat;
6028
6029                                 mat = appendchain;
6030                                 while (mat) {
6031                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6032                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6033                                         }
6034                                         mat = SCTP_BUF_NEXT(mat);
6035                                 }
6036                         }
6037 #endif
6038                 }
6039         }
6040         if (appendchain == NULL) {
6041                 /* error */
6042                 if (outchain)
6043                         sctp_m_freem(outchain);
6044                 return (NULL);
6045         }
6046         if (outchain) {
6047                 /* tack on to the end */
6048                 if (*endofchain != NULL) {
6049                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6050                 } else {
6051                         m = outchain;
6052                         while (m) {
6053                                 if (SCTP_BUF_NEXT(m) == NULL) {
6054                                         SCTP_BUF_NEXT(m) = appendchain;
6055                                         break;
6056                                 }
6057                                 m = SCTP_BUF_NEXT(m);
6058                         }
6059                 }
6060                 /*
6061                  * save off the end and update the end-chain postion
6062                  */
6063                 m = appendchain;
6064                 while (m) {
6065                         if (SCTP_BUF_NEXT(m) == NULL) {
6066                                 *endofchain = m;
6067                                 break;
6068                         }
6069                         m = SCTP_BUF_NEXT(m);
6070                 }
6071                 return (outchain);
6072         } else {
6073                 /* save off the end and update the end-chain postion */
6074                 m = appendchain;
6075                 while (m) {
6076                         if (SCTP_BUF_NEXT(m) == NULL) {
6077                                 *endofchain = m;
6078                                 break;
6079                         }
6080                         m = SCTP_BUF_NEXT(m);
6081                 }
6082                 return (appendchain);
6083         }
6084 }
6085
6086 int
6087 sctp_med_chunk_output(struct sctp_inpcb *inp,
6088     struct sctp_tcb *stcb,
6089     struct sctp_association *asoc,
6090     int *num_out,
6091     int *reason_code,
6092     int control_only, int from_where,
6093     struct timeval *now, int *now_filled, int frag_point, int so_locked
6094 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6095     SCTP_UNUSED
6096 #endif
6097 );
6098
6099 static void
6100 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6101     uint32_t val)
6102 {
6103         struct sctp_copy_all *ca;
6104         struct mbuf *m;
6105         int ret = 0;
6106         int added_control = 0;
6107         int un_sent, do_chunk_output = 1;
6108         struct sctp_association *asoc;
6109
6110         ca = (struct sctp_copy_all *)ptr;
6111         if (ca->m == NULL) {
6112                 return;
6113         }
6114         if (ca->inp != inp) {
6115                 /* TSNH */
6116                 return;
6117         }
6118         if ((ca->m) && ca->sndlen) {
6119                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6120                 if (m == NULL) {
6121                         /* can't copy so we are done */
6122                         ca->cnt_failed++;
6123                         return;
6124                 }
6125 #ifdef SCTP_MBUF_LOGGING
6126                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6127                         struct mbuf *mat;
6128
6129                         mat = m;
6130                         while (mat) {
6131                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6132                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6133                                 }
6134                                 mat = SCTP_BUF_NEXT(mat);
6135                         }
6136                 }
6137 #endif
6138         } else {
6139                 m = NULL;
6140         }
6141         SCTP_TCB_LOCK_ASSERT(stcb);
6142         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6143                 /* Abort this assoc with m as the user defined reason */
6144                 if (m) {
6145                         struct sctp_paramhdr *ph;
6146
6147                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6148                         if (m) {
6149                                 ph = mtod(m, struct sctp_paramhdr *);
6150                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6151                                 ph->param_length = htons(ca->sndlen);
6152                         }
6153                         /*
6154                          * We add one here to keep the assoc from
6155                          * dis-appearing on us.
6156                          */
6157                         atomic_add_int(&stcb->asoc.refcnt, 1);
6158                         sctp_abort_an_association(inp, stcb,
6159                             SCTP_RESPONSE_TO_USER_REQ,
6160                             m, SCTP_SO_NOT_LOCKED);
6161                         /*
6162                          * sctp_abort_an_association calls sctp_free_asoc()
6163                          * free association will NOT free it since we
6164                          * incremented the refcnt .. we do this to prevent
6165                          * it being freed and things getting tricky since we
6166                          * could end up (from free_asoc) calling inpcb_free
6167                          * which would get a recursive lock call to the
6168                          * iterator lock.. But as a consequence of that the
6169                          * stcb will return to us un-locked.. since
6170                          * free_asoc returns with either no TCB or the TCB
6171                          * unlocked, we must relock.. to unlock in the
6172                          * iterator timer :-0
6173                          */
6174                         SCTP_TCB_LOCK(stcb);
6175                         atomic_add_int(&stcb->asoc.refcnt, -1);
6176                         goto no_chunk_output;
6177                 }
6178         } else {
6179                 if (m) {
6180                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6181                             &ca->sndrcv, 1);
6182                 }
6183                 asoc = &stcb->asoc;
6184                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6185                         /* shutdown this assoc */
6186                         int cnt;
6187
6188                         cnt = sctp_is_there_unsent_data(stcb);
6189
6190                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6191                             TAILQ_EMPTY(&asoc->sent_queue) &&
6192                             (cnt == 0)) {
6193                                 if (asoc->locked_on_sending) {
6194                                         goto abort_anyway;
6195                                 }
6196                                 /*
6197                                  * there is nothing queued to send, so I'm
6198                                  * done...
6199                                  */
6200                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6201                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6202                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6203                                         /*
6204                                          * only send SHUTDOWN the first time
6205                                          * through
6206                                          */
6207                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6208                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6209                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6210                                         }
6211                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6212                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6213                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6214                                             asoc->primary_destination);
6215                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6216                                             asoc->primary_destination);
6217                                         added_control = 1;
6218                                         do_chunk_output = 0;
6219                                 }
6220                         } else {
6221                                 /*
6222                                  * we still got (or just got) data to send,
6223                                  * so set SHUTDOWN_PENDING
6224                                  */
6225                                 /*
6226                                  * XXX sockets draft says that SCTP_EOF
6227                                  * should be sent with no data.  currently,
6228                                  * we will allow user data to be sent first
6229                                  * and move to SHUTDOWN-PENDING
6230                                  */
6231                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6232                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6233                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6234                                         if (asoc->locked_on_sending) {
6235                                                 /*
6236                                                  * Locked to send out the
6237                                                  * data
6238                                                  */
6239                                                 struct sctp_stream_queue_pending *sp;
6240
6241                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6242                                                 if (sp) {
6243                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6244                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6245                                                 }
6246                                         }
6247                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6248                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6249                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6250                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6251                                 abort_anyway:
6252                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6253                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6254                                                     SCTP_RESPONSE_TO_USER_REQ,
6255                                                     NULL, SCTP_SO_NOT_LOCKED);
6256                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6257                                                 goto no_chunk_output;
6258                                         }
6259                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6260                                             asoc->primary_destination);
6261                                 }
6262                         }
6263
6264                 }
6265         }
6266         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6267             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6268
6269         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6270             (stcb->asoc.total_flight > 0) &&
6271             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6272             ) {
6273                 do_chunk_output = 0;
6274         }
6275         if (do_chunk_output)
6276                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6277         else if (added_control) {
6278                 int num_out = 0, reason = 0, now_filled = 0;
6279                 struct timeval now;
6280                 int frag_point;
6281
6282                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6283                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6284                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6285         }
6286 no_chunk_output:
6287         if (ret) {
6288                 ca->cnt_failed++;
6289         } else {
6290                 ca->cnt_sent++;
6291         }
6292 }
6293
6294 static void
6295 sctp_sendall_completes(void *ptr, uint32_t val)
6296 {
6297         struct sctp_copy_all *ca;
6298
6299         ca = (struct sctp_copy_all *)ptr;
6300         /*
6301          * Do a notify here? Kacheong suggests that the notify be done at
6302          * the send time.. so you would push up a notification if any send
6303          * failed. Don't know if this is feasable since the only failures we
6304          * have is "memory" related and if you cannot get an mbuf to send
6305          * the data you surely can't get an mbuf to send up to notify the
6306          * user you can't send the data :->
6307          */
6308
6309         /* now free everything */
6310         sctp_m_freem(ca->m);
6311         SCTP_FREE(ca, SCTP_M_COPYAL);
6312 }
6313
6314
6315 #define MC_ALIGN(m, len) do {                                           \
6316         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6317 } while (0)
6318
6319
6320
6321 static struct mbuf *
6322 sctp_copy_out_all(struct uio *uio, int len)
6323 {
6324         struct mbuf *ret, *at;
6325         int left, willcpy, cancpy, error;
6326
6327         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6328         if (ret == NULL) {
6329                 /* TSNH */
6330                 return (NULL);
6331         }
6332         left = len;
6333         SCTP_BUF_LEN(ret) = 0;
6334         /* save space for the data chunk header */
6335         cancpy = M_TRAILINGSPACE(ret);
6336         willcpy = min(cancpy, left);
6337         at = ret;
6338         while (left > 0) {
6339                 /* Align data to the end */
6340                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6341                 if (error) {
6342         err_out_now:
6343                         sctp_m_freem(at);
6344                         return (NULL);
6345                 }
6346                 SCTP_BUF_LEN(at) = willcpy;
6347                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6348                 left -= willcpy;
6349                 if (left > 0) {
6350                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6351                         if (SCTP_BUF_NEXT(at) == NULL) {
6352                                 goto err_out_now;
6353                         }
6354                         at = SCTP_BUF_NEXT(at);
6355                         SCTP_BUF_LEN(at) = 0;
6356                         cancpy = M_TRAILINGSPACE(at);
6357                         willcpy = min(cancpy, left);
6358                 }
6359         }
6360         return (ret);
6361 }
6362
6363 static int
6364 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6365     struct sctp_sndrcvinfo *srcv)
6366 {
6367         int ret;
6368         struct sctp_copy_all *ca;
6369
6370         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6371             SCTP_M_COPYAL);
6372         if (ca == NULL) {
6373                 sctp_m_freem(m);
6374                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6375                 return (ENOMEM);
6376         }
6377         memset(ca, 0, sizeof(struct sctp_copy_all));
6378
6379         ca->inp = inp;
6380         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6381         /*
6382          * take off the sendall flag, it would be bad if we failed to do
6383          * this :-0
6384          */
6385         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6386         /* get length and mbuf chain */
6387         if (uio) {
6388                 ca->sndlen = uio->uio_resid;
6389                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6390                 if (ca->m == NULL) {
6391                         SCTP_FREE(ca, SCTP_M_COPYAL);
6392                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6393                         return (ENOMEM);
6394                 }
6395         } else {
6396                 /* Gather the length of the send */
6397                 struct mbuf *mat;
6398
6399                 mat = m;
6400                 ca->sndlen = 0;
6401                 while (m) {
6402                         ca->sndlen += SCTP_BUF_LEN(m);
6403                         m = SCTP_BUF_NEXT(m);
6404                 }
6405                 ca->m = mat;
6406         }
6407         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6408             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6409             SCTP_ASOC_ANY_STATE,
6410             (void *)ca, 0,
6411             sctp_sendall_completes, inp, 1);
6412         if (ret) {
6413                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6414                 SCTP_FREE(ca, SCTP_M_COPYAL);
6415                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6416                 return (EFAULT);
6417         }
6418         return (0);
6419 }
6420
6421
6422 void
6423 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6424 {
6425         struct sctp_tmit_chunk *chk, *nchk;
6426
6427         chk = TAILQ_FIRST(&asoc->control_send_queue);
6428         while (chk) {
6429                 nchk = TAILQ_NEXT(chk, sctp_next);
6430                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6431                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6432                         if (chk->data) {
6433                                 sctp_m_freem(chk->data);
6434                                 chk->data = NULL;
6435                         }
6436                         asoc->ctrl_queue_cnt--;
6437                         sctp_free_a_chunk(stcb, chk);
6438                 }
6439                 chk = nchk;
6440         }
6441 }
6442
6443 void
6444 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6445 {
6446         struct sctp_association *asoc;
6447         struct sctp_tmit_chunk *chk, *chk_tmp;
6448         struct sctp_asconf_chunk *acp;
6449
6450         asoc = &stcb->asoc;
6451         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6452             chk = chk_tmp) {
6453                 /* get next chk */
6454                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6455                 /* find SCTP_ASCONF chunk in queue */
6456                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6457                         if (chk->data) {
6458                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6459                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6460                                         /* Not Acked yet */
6461                                         break;
6462                                 }
6463                         }
6464                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6465                         if (chk->data) {
6466                                 sctp_m_freem(chk->data);
6467                                 chk->data = NULL;
6468                         }
6469                         asoc->ctrl_queue_cnt--;
6470                         sctp_free_a_chunk(stcb, chk);
6471                 }
6472         }
6473 }
6474
6475
6476 static void
6477 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6478
6479     struct sctp_association *asoc,
6480     struct sctp_tmit_chunk **data_list,
6481     int bundle_at,
6482     struct sctp_nets *net)
6483 {
6484         int i;
6485         struct sctp_tmit_chunk *tp1;
6486
6487         for (i = 0; i < bundle_at; i++) {
6488                 /* off of the send queue */
6489                 if (i) {
6490                         /*
6491                          * Any chunk NOT 0 you zap the time chunk 0 gets
6492                          * zapped or set based on if a RTO measurment is
6493                          * needed.
6494                          */
6495                         data_list[i]->do_rtt = 0;
6496                 }
6497                 /* record time */
6498                 data_list[i]->sent_rcv_time = net->last_sent_time;
6499                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6500                 TAILQ_REMOVE(&asoc->send_queue,
6501                     data_list[i],
6502                     sctp_next);
6503                 /* on to the sent queue */
6504                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6505                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6506                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6507                         struct sctp_tmit_chunk *tpp;
6508
6509                         /* need to move back */
6510         back_up_more:
6511                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6512                         if (tpp == NULL) {
6513                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6514                                 goto all_done;
6515                         }
6516                         tp1 = tpp;
6517                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6518                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6519                                 goto back_up_more;
6520                         }
6521                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6522                 } else {
6523                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6524                             data_list[i],
6525                             sctp_next);
6526                 }
6527 all_done:
6528                 /* This does not lower until the cum-ack passes it */
6529                 asoc->sent_queue_cnt++;
6530                 asoc->send_queue_cnt--;
6531                 if ((asoc->peers_rwnd <= 0) &&
6532                     (asoc->total_flight == 0) &&
6533                     (bundle_at == 1)) {
6534                         /* Mark the chunk as being a window probe */
6535                         SCTP_STAT_INCR(sctps_windowprobed);
6536                 }
6537 #ifdef SCTP_AUDITING_ENABLED
6538                 sctp_audit_log(0xC2, 3);
6539 #endif
6540                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6541                 data_list[i]->snd_count = 1;
6542                 data_list[i]->rec.data.chunk_was_revoked = 0;
6543                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6544                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6545                             data_list[i]->whoTo->flight_size,
6546                             data_list[i]->book_size,
6547                             (uintptr_t) data_list[i]->whoTo,
6548                             data_list[i]->rec.data.TSN_seq);
6549                 }
6550                 sctp_flight_size_increase(data_list[i]);
6551                 sctp_total_flight_increase(stcb, data_list[i]);
6552                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6553                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6554                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6555                 }
6556                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6557                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6558                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6559                         /* SWS sender side engages */
6560                         asoc->peers_rwnd = 0;
6561                 }
6562         }
6563 }
6564
6565 static void
6566 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6567 {
6568         struct sctp_tmit_chunk *chk, *nchk;
6569
6570         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6571             chk; chk = nchk) {
6572                 nchk = TAILQ_NEXT(chk, sctp_next);
6573                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6574                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6575                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6576                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6577                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6578                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6579                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6580                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6581                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6582                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6583                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6584                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6585                         /* Stray chunks must be cleaned up */
6586         clean_up_anyway:
6587                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6588                         if (chk->data) {
6589                                 sctp_m_freem(chk->data);
6590                                 chk->data = NULL;
6591                         }
6592                         asoc->ctrl_queue_cnt--;
6593                         sctp_free_a_chunk(stcb, chk);
6594                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6595                         /* special handling, we must look into the param */
6596                         if (chk != asoc->str_reset) {
6597                                 goto clean_up_anyway;
6598                         }
6599                 }
6600         }
6601 }
6602
6603
6604 static int
6605 sctp_can_we_split_this(struct sctp_tcb *stcb,
6606     uint32_t length,
6607     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6608 {
6609         /*
6610          * Make a decision on if I should split a msg into multiple parts.
6611          * This is only asked of incomplete messages.
6612          */
6613         if (eeor_on) {
6614                 /*
6615                  * If we are doing EEOR we need to always send it if its the
6616                  * entire thing, since it might be all the guy is putting in
6617                  * the hopper.
6618                  */
6619                 if (goal_mtu >= length) {
6620                         /*-
6621                          * If we have data outstanding,
6622                          * we get another chance when the sack
6623                          * arrives to transmit - wait for more data
6624                          */
6625                         if (stcb->asoc.total_flight == 0) {
6626                                 /*
6627                                  * If nothing is in flight, we zero the
6628                                  * packet counter.
6629                                  */
6630                                 return (length);
6631                         }
6632                         return (0);
6633
6634                 } else {
6635                         /* You can fill the rest */
6636                         return (goal_mtu);
6637                 }
6638         }
6639         /*-
6640          * For those strange folk that make the send buffer
6641          * smaller than our fragmentation point, we can't
6642          * get a full msg in so we have to allow splitting.
6643          */
6644         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6645                 return (length);
6646         }
6647         if ((length <= goal_mtu) ||
6648             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6649                 /* Sub-optimial residual don't split in non-eeor mode. */
6650                 return (0);
6651         }
6652         /*
6653          * If we reach here length is larger than the goal_mtu. Do we wish
6654          * to split it for the sake of packet putting together?
6655          */
6656         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6657                 /* Its ok to split it */
6658                 return (min(goal_mtu, frag_point));
6659         }
6660         /* Nope, can't split */
6661         return (0);
6662
6663 }
6664
6665 static uint32_t
6666 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6667     struct sctp_stream_out *strq,
6668     uint32_t goal_mtu,
6669     uint32_t frag_point,
6670     int *locked,
6671     int *giveup,
6672     int eeor_mode,
6673     int *bail)
6674 {
6675         /* Move from the stream to the send_queue keeping track of the total */
6676         struct sctp_association *asoc;
6677         struct sctp_stream_queue_pending *sp;
6678         struct sctp_tmit_chunk *chk;
6679         struct sctp_data_chunk *dchkh;
6680         uint32_t to_move, length;
6681         uint8_t rcv_flags = 0;
6682         uint8_t some_taken;
6683         uint8_t send_lock_up = 0;
6684
6685         SCTP_TCB_LOCK_ASSERT(stcb);
6686         asoc = &stcb->asoc;
6687 one_more_time:
6688         /* sa_ignore FREED_MEMORY */
6689         sp = TAILQ_FIRST(&strq->outqueue);
6690         if (sp == NULL) {
6691                 *locked = 0;
6692                 if (send_lock_up == 0) {
6693                         SCTP_TCB_SEND_LOCK(stcb);
6694                         send_lock_up = 1;
6695                 }
6696                 sp = TAILQ_FIRST(&strq->outqueue);
6697                 if (sp) {
6698                         goto one_more_time;
6699                 }
6700                 if (strq->last_msg_incomplete) {
6701                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6702                             strq->stream_no,
6703                             strq->last_msg_incomplete);
6704                         strq->last_msg_incomplete = 0;
6705                 }
6706                 to_move = 0;
6707                 if (send_lock_up) {
6708                         SCTP_TCB_SEND_UNLOCK(stcb);
6709                         send_lock_up = 0;
6710                 }
6711                 goto out_of;
6712         }
6713         if ((sp->msg_is_complete) && (sp->length == 0)) {
6714                 if (sp->sender_all_done) {
6715                         /*
6716                          * We are doing differed cleanup. Last time through
6717                          * when we took all the data the sender_all_done was
6718                          * not set.
6719                          */
6720                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6721                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6722                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6723                                     sp->sender_all_done,
6724                                     sp->length,
6725                                     sp->msg_is_complete,
6726                                     sp->put_last_out,
6727                                     send_lock_up);
6728                         }
6729                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6730                                 SCTP_TCB_SEND_LOCK(stcb);
6731                                 send_lock_up = 1;
6732                         }
6733                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6734                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6735                         sctp_free_remote_addr(sp->net);
6736                         if (sp->data) {
6737                                 sctp_m_freem(sp->data);
6738                                 sp->data = NULL;
6739                         }
6740                         sctp_free_a_strmoq(stcb, sp);
6741                         /* we can't be locked to it */
6742                         *locked = 0;
6743                         stcb->asoc.locked_on_sending = NULL;
6744                         if (send_lock_up) {
6745                                 SCTP_TCB_SEND_UNLOCK(stcb);
6746                                 send_lock_up = 0;
6747                         }
6748                         /* back to get the next msg */
6749                         goto one_more_time;
6750                 } else {
6751                         /*
6752                          * sender just finished this but still holds a
6753                          * reference
6754                          */
6755                         *locked = 1;
6756                         *giveup = 1;
6757                         to_move = 0;
6758                         goto out_of;
6759                 }
6760         } else {
6761                 /* is there some to get */
6762                 if (sp->length == 0) {
6763                         /* no */
6764                         *locked = 1;
6765                         *giveup = 1;
6766                         to_move = 0;
6767                         goto out_of;
6768                 } else if (sp->discard_rest) {
6769                         if (send_lock_up == 0) {
6770                                 SCTP_TCB_SEND_LOCK(stcb);
6771                                 send_lock_up = 1;
6772                         }
6773                         /* Whack down the size */
6774                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6775                         if ((stcb->sctp_socket != NULL) && \
6776                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6777                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6778                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6779                         }
6780                         if (sp->data) {
6781                                 sctp_m_freem(sp->data);
6782                                 sp->data = NULL;
6783                                 sp->tail_mbuf = NULL;
6784                         }
6785                         sp->length = 0;
6786                         sp->some_taken = 1;
6787                         *locked = 1;
6788                         *giveup = 1;
6789                         to_move = 0;
6790                         goto out_of;
6791                 }
6792         }
6793         some_taken = sp->some_taken;
6794         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6795                 sp->msg_is_complete = 1;
6796         }
6797 re_look:
6798         length = sp->length;
6799         if (sp->msg_is_complete) {
6800                 /* The message is complete */
6801                 to_move = min(length, frag_point);
6802                 if (to_move == length) {
6803                         /* All of it fits in the MTU */
6804                         if (sp->some_taken) {
6805                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6806                                 sp->put_last_out = 1;
6807                         } else {
6808                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6809                                 sp->put_last_out = 1;
6810                         }
6811                 } else {
6812                         /* Not all of it fits, we fragment */
6813                         if (sp->some_taken == 0) {
6814                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6815                         }
6816                         sp->some_taken = 1;
6817                 }
6818         } else {
6819                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6820                 if (to_move) {
6821                         /*-
6822                          * We use a snapshot of length in case it
6823                          * is expanding during the compare.
6824                          */
6825                         uint32_t llen;
6826
6827                         llen = length;
6828                         if (to_move >= llen) {
6829                                 to_move = llen;
6830                                 if (send_lock_up == 0) {
6831                                         /*-
6832                                          * We are taking all of an incomplete msg
6833                                          * thus we need a send lock.
6834                                          */
6835                                         SCTP_TCB_SEND_LOCK(stcb);
6836                                         send_lock_up = 1;
6837                                         if (sp->msg_is_complete) {
6838                                                 /*
6839                                                  * the sender finished the
6840                                                  * msg
6841                                                  */
6842                                                 goto re_look;
6843                                         }
6844                                 }
6845                         }
6846                         if (sp->some_taken == 0) {
6847                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6848                                 sp->some_taken = 1;
6849                         }
6850                 } else {
6851                         /* Nothing to take. */
6852                         if (sp->some_taken) {
6853                                 *locked = 1;
6854                         }
6855                         *giveup = 1;
6856                         to_move = 0;
6857                         goto out_of;
6858                 }
6859         }
6860
6861         /* If we reach here, we can copy out a chunk */
6862         sctp_alloc_a_chunk(stcb, chk);
6863         if (chk == NULL) {
6864                 /* No chunk memory */
6865                 *giveup = 1;
6866                 to_move = 0;
6867                 goto out_of;
6868         }
6869         /*
6870          * Setup for unordered if needed by looking at the user sent info
6871          * flags.
6872          */
6873         if (sp->sinfo_flags & SCTP_UNORDERED) {
6874                 rcv_flags |= SCTP_DATA_UNORDERED;
6875         }
6876         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6877             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6878                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6879         }
6880         /* clear out the chunk before setting up */
6881         memset(chk, 0, sizeof(*chk));
6882         chk->rec.data.rcv_flags = rcv_flags;
6883
6884         if (to_move >= length) {
6885                 /* we think we can steal the whole thing */
6886                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6887                         SCTP_TCB_SEND_LOCK(stcb);
6888                         send_lock_up = 1;
6889                 }
6890                 if (to_move < sp->length) {
6891                         /* bail, it changed */
6892                         goto dont_do_it;
6893                 }
6894                 chk->data = sp->data;
6895                 chk->last_mbuf = sp->tail_mbuf;
6896                 /* register the stealing */
6897                 sp->data = sp->tail_mbuf = NULL;
6898         } else {
6899                 struct mbuf *m;
6900
6901 dont_do_it:
6902                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6903                 chk->last_mbuf = NULL;
6904                 if (chk->data == NULL) {
6905                         sp->some_taken = some_taken;
6906                         sctp_free_a_chunk(stcb, chk);
6907                         *bail = 1;
6908                         to_move = 0;
6909                         goto out_of;
6910                 }
6911 #ifdef SCTP_MBUF_LOGGING
6912                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6913                         struct mbuf *mat;
6914
6915                         mat = chk->data;
6916                         while (mat) {
6917                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6918                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6919                                 }
6920                                 mat = SCTP_BUF_NEXT(mat);
6921                         }
6922                 }
6923 #endif
6924                 /* Pull off the data */
6925                 m_adj(sp->data, to_move);
6926                 /* Now lets work our way down and compact it */
6927                 m = sp->data;
6928                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6929                         sp->data = SCTP_BUF_NEXT(m);
6930                         SCTP_BUF_NEXT(m) = NULL;
6931                         if (sp->tail_mbuf == m) {
6932                                 /*-
6933                                  * Freeing tail? TSNH since
6934                                  * we supposedly were taking less
6935                                  * than the sp->length.
6936                                  */
6937 #ifdef INVARIANTS
6938                                 panic("Huh, freing tail? - TSNH");
6939 #else
6940                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6941                                 sp->tail_mbuf = sp->data = NULL;
6942                                 sp->length = 0;
6943 #endif
6944
6945                         }
6946                         sctp_m_free(m);
6947                         m = sp->data;
6948                 }
6949         }
6950         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6951                 chk->copy_by_ref = 1;
6952         } else {
6953                 chk->copy_by_ref = 0;
6954         }
6955         /*
6956          * get last_mbuf and counts of mb useage This is ugly but hopefully
6957          * its only one mbuf.
6958          */
6959         if (chk->last_mbuf == NULL) {
6960                 chk->last_mbuf = chk->data;
6961                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6962                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6963                 }
6964         }
6965         if (to_move > length) {
6966                 /*- This should not happen either
6967                  * since we always lower to_move to the size
6968                  * of sp->length if its larger.
6969                  */
6970 #ifdef INVARIANTS
6971                 panic("Huh, how can to_move be larger?");
6972 #else
6973                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6974                 sp->length = 0;
6975 #endif
6976         } else {
6977                 atomic_subtract_int(&sp->length, to_move);
6978         }
6979         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6980                 /* Not enough room for a chunk header, get some */
6981                 struct mbuf *m;
6982
6983                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6984                 if (m == NULL) {
6985                         /*
6986                          * we're in trouble here. _PREPEND below will free
6987                          * all the data if there is no leading space, so we
6988                          * must put the data back and restore.
6989                          */
6990                         if (send_lock_up == 0) {
6991                                 SCTP_TCB_SEND_LOCK(stcb);
6992                                 send_lock_up = 1;
6993                         }
6994                         if (chk->data == NULL) {
6995                                 /* unsteal the data */
6996                                 sp->data = chk->data;
6997                                 sp->tail_mbuf = chk->last_mbuf;
6998                         } else {
6999                                 struct mbuf *m_tmp;
7000
7001                                 /* reassemble the data */
7002                                 m_tmp = sp->data;
7003                                 sp->data = chk->data;
7004                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7005                         }
7006                         sp->some_taken = some_taken;
7007                         atomic_add_int(&sp->length, to_move);
7008                         chk->data = NULL;
7009                         *bail = 1;
7010                         sctp_free_a_chunk(stcb, chk);
7011                         to_move = 0;
7012                         goto out_of;
7013                 } else {
7014                         SCTP_BUF_LEN(m) = 0;
7015                         SCTP_BUF_NEXT(m) = chk->data;
7016                         chk->data = m;
7017                         M_ALIGN(chk->data, 4);
7018                 }
7019         }
7020         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7021         if (chk->data == NULL) {
7022                 /* HELP, TSNH since we assured it would not above? */
7023 #ifdef INVARIANTS
7024                 panic("prepend failes HELP?");
7025 #else
7026                 SCTP_PRINTF("prepend fails HELP?\n");
7027                 sctp_free_a_chunk(stcb, chk);
7028 #endif
7029                 *bail = 1;
7030                 to_move = 0;
7031                 goto out_of;
7032         }
7033         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7034         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7035         chk->book_size_scale = 0;
7036         chk->sent = SCTP_DATAGRAM_UNSENT;
7037
7038         chk->flags = 0;
7039         chk->asoc = &stcb->asoc;
7040         chk->pad_inplace = 0;
7041         chk->no_fr_allowed = 0;
7042         chk->rec.data.stream_seq = sp->strseq;
7043         chk->rec.data.stream_number = sp->stream;
7044         chk->rec.data.payloadtype = sp->ppid;
7045         chk->rec.data.context = sp->context;
7046         chk->rec.data.doing_fast_retransmit = 0;
7047         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7048
7049         chk->rec.data.timetodrop = sp->ts;
7050         chk->flags = sp->act_flags;
7051         chk->addr_over = sp->addr_over;
7052
7053         chk->whoTo = net;
7054         atomic_add_int(&chk->whoTo->ref_count, 1);
7055
7056         if (sp->holds_key_ref) {
7057                 chk->auth_keyid = sp->auth_keyid;
7058                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7059                 chk->holds_key_ref = 1;
7060         }
7061         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7062         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7063                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7064                     (uintptr_t) stcb, sp->length,
7065                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7066                     chk->rec.data.TSN_seq);
7067         }
7068         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7069         /*
7070          * Put the rest of the things in place now. Size was done earlier in
7071          * previous loop prior to padding.
7072          */
7073
7074 #ifdef SCTP_ASOCLOG_OF_TSNS
7075         SCTP_TCB_LOCK_ASSERT(stcb);
7076         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7077                 asoc->tsn_out_at = 0;
7078                 asoc->tsn_out_wrapped = 1;
7079         }
7080         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7081         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7082         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7083         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7084         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7085         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7086         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7087         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7088         asoc->tsn_out_at++;
7089 #endif
7090
7091         dchkh->ch.chunk_type = SCTP_DATA;
7092         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7093         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7094         dchkh->dp.stream_id = htons(strq->stream_no);
7095         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7096         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7097         dchkh->ch.chunk_length = htons(chk->send_size);
7098         /* Now advance the chk->send_size by the actual pad needed. */
7099         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7100                 /* need a pad */
7101                 struct mbuf *lm;
7102                 int pads;
7103
7104                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7105                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7106                         chk->pad_inplace = 1;
7107                 }
7108                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7109                         /* pad added an mbuf */
7110                         chk->last_mbuf = lm;
7111                 }
7112                 chk->send_size += pads;
7113         }
7114         /* We only re-set the policy if it is on */
7115         if (sp->pr_sctp_on) {
7116                 sctp_set_prsctp_policy(sp);
7117                 asoc->pr_sctp_cnt++;
7118                 chk->pr_sctp_on = 1;
7119         } else {
7120                 chk->pr_sctp_on = 0;
7121         }
7122         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7123                 /* All done pull and kill the message */
7124                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7125                 if (sp->put_last_out == 0) {
7126                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7127                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7128                             sp->sender_all_done,
7129                             sp->length,
7130                             sp->msg_is_complete,
7131                             sp->put_last_out,
7132                             send_lock_up);
7133                 }
7134                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7135                         SCTP_TCB_SEND_LOCK(stcb);
7136                         send_lock_up = 1;
7137                 }
7138                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7139                 sctp_free_remote_addr(sp->net);
7140                 if (sp->data) {
7141                         sctp_m_freem(sp->data);
7142                         sp->data = NULL;
7143                 }
7144                 sctp_free_a_strmoq(stcb, sp);
7145
7146                 /* we can't be locked to it */
7147                 *locked = 0;
7148                 stcb->asoc.locked_on_sending = NULL;
7149         } else {
7150                 /* more to go, we are locked */
7151                 *locked = 1;
7152         }
7153         asoc->chunks_on_out_queue++;
7154         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7155         asoc->send_queue_cnt++;
7156 out_of:
7157         if (send_lock_up) {
7158                 SCTP_TCB_SEND_UNLOCK(stcb);
7159                 send_lock_up = 0;
7160         }
7161         return (to_move);
7162 }
7163
7164
7165 static struct sctp_stream_out *
7166 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7167 {
7168         struct sctp_stream_out *strq;
7169
7170         /* Find the next stream to use */
7171         if (asoc->last_out_stream == NULL) {
7172                 strq = TAILQ_FIRST(&asoc->out_wheel);
7173         } else {
7174                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7175                 if (strq == NULL) {
7176                         strq = TAILQ_FIRST(&asoc->out_wheel);
7177                 }
7178         }
7179         return (strq);
7180 }
7181
7182
7183 static void
7184 sctp_fill_outqueue(struct sctp_tcb *stcb,
7185     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7186 {
7187         struct sctp_association *asoc;
7188         struct sctp_stream_out *strq, *strqn, *strqt;
7189         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7190         int locked, giveup;
7191         struct sctp_stream_queue_pending *sp;
7192
7193         SCTP_TCB_LOCK_ASSERT(stcb);
7194         asoc = &stcb->asoc;
7195 #ifdef INET6
7196         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7197                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7198         } else {
7199                 /* ?? not sure what else to do */
7200                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7201         }
7202 #else
7203         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7204 #endif
7205         /* Need an allowance for the data chunk header too */
7206         goal_mtu -= sizeof(struct sctp_data_chunk);
7207
7208         /* must make even word boundary */
7209         goal_mtu &= 0xfffffffc;
7210         if (asoc->locked_on_sending) {
7211                 /* We are stuck on one stream until the message completes. */
7212                 strqn = strq = asoc->locked_on_sending;
7213                 locked = 1;
7214         } else {
7215                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7216                 locked = 0;
7217         }
7218
7219         while ((goal_mtu > 0) && strq) {
7220                 sp = TAILQ_FIRST(&strq->outqueue);
7221                 /*
7222                  * If CMT is off, we must validate that the stream in
7223                  * question has the first item pointed towards are network
7224                  * destionation requested by the caller. Note that if we
7225                  * turn out to be locked to a stream (assigning TSN's then
7226                  * we must stop, since we cannot look for another stream
7227                  * with data to send to that destination). In CMT's case, by
7228                  * skipping this check, we will send one data packet towards
7229                  * the requested net.
7230                  */
7231                 if (sp == NULL) {
7232                         break;
7233                 }
7234                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7235                         /* none for this network */
7236                         if (locked) {
7237                                 break;
7238                         } else {
7239                                 strq = sctp_select_a_stream(stcb, asoc);
7240                                 if (strq == NULL)
7241                                         /* none left */
7242                                         break;
7243                                 if (strqn == strq) {
7244                                         /* I have circled */
7245                                         break;
7246                                 }
7247                                 continue;
7248                         }
7249                 }
7250                 giveup = 0;
7251                 bail = 0;
7252                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7253                     &giveup, eeor_mode, &bail);
7254                 if (moved_how_much)
7255                         asoc->last_out_stream = strq;
7256
7257                 if (locked) {
7258                         asoc->locked_on_sending = strq;
7259                         if ((moved_how_much == 0) || (giveup) || bail)
7260                                 /* no more to move for now */
7261                                 break;
7262                 } else {
7263                         asoc->locked_on_sending = NULL;
7264                         strqt = sctp_select_a_stream(stcb, asoc);
7265                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7266                                 if (strq == strqn) {
7267                                         /* Must move start to next one */
7268                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7269                                         if (strqn == NULL) {
7270                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7271                                                 if (strqn == NULL) {
7272                                                         break;
7273                                                 }
7274                                         }
7275                                 }
7276                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7277                         }
7278                         if ((giveup) || bail) {
7279                                 break;
7280                         }
7281                         strq = strqt;
7282                         if (strq == NULL) {
7283                                 break;
7284                         }
7285                 }
7286                 total_moved += moved_how_much;
7287                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7288                 goal_mtu &= 0xfffffffc;
7289         }
7290         if (bail)
7291                 *quit_now = 1;
7292
7293         if (total_moved == 0) {
7294                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7295                     (net == stcb->asoc.primary_destination)) {
7296                         /* ran dry for primary network net */
7297                         SCTP_STAT_INCR(sctps_primary_randry);
7298                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7299                         /* ran dry with CMT on */
7300                         SCTP_STAT_INCR(sctps_cmt_randry);
7301                 }
7302         }
7303 }
7304
7305 void
7306 sctp_fix_ecn_echo(struct sctp_association *asoc)
7307 {
7308         struct sctp_tmit_chunk *chk;
7309
7310         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7311                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7312                         chk->sent = SCTP_DATAGRAM_UNSENT;
7313                 }
7314         }
7315 }
7316
7317 static void
7318 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7319     struct sctp_association *asoc,
7320     struct sctp_nets *net)
7321 {
7322         struct sctp_tmit_chunk *chk;
7323         struct sctp_nets *a_net;
7324
7325         SCTP_TCB_LOCK_ASSERT(stcb);
7326         /*
7327          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7328          * destination using the PF algorithm for finding alternate
7329          * destinations.
7330          */
7331         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7332                 a_net = sctp_find_alternate_net(stcb, net, 2);
7333         } else {
7334                 a_net = sctp_find_alternate_net(stcb, net, 0);
7335         }
7336         if ((a_net != net) &&
7337             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7338                 /*
7339                  * We only proceed if a valid alternate is found that is not
7340                  * this one and is reachable. Here we must move all chunks
7341                  * queued in the send queue off of the destination address
7342                  * to our alternate.
7343                  */
7344                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7345                         if (chk->whoTo == net) {
7346                                 /* Move the chunk to our alternate */
7347                                 sctp_free_remote_addr(chk->whoTo);
7348                                 chk->whoTo = a_net;
7349                                 atomic_add_int(&a_net->ref_count, 1);
7350                         }
7351                 }
7352         }
7353 }
7354
7355 int
7356 sctp_med_chunk_output(struct sctp_inpcb *inp,
7357     struct sctp_tcb *stcb,
7358     struct sctp_association *asoc,
7359     int *num_out,
7360     int *reason_code,
7361     int control_only, int from_where,
7362     struct timeval *now, int *now_filled, int frag_point, int so_locked
7363 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7364     SCTP_UNUSED
7365 #endif
7366 )
7367 {
7368         /*
7369          * Ok this is the generic chunk service queue. we must do the
7370          * following: - Service the stream queue that is next, moving any
7371          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7372          * LAST to the out queue in one pass) and assigning TSN's - Check to
7373          * see if the cwnd/rwnd allows any output, if so we go ahead and
7374          * fomulate and send the low level chunks. Making sure to combine
7375          * any control in the control chunk queue also.
7376          */
7377         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7378         struct mbuf *outchain, *endoutchain;
7379         struct sctp_tmit_chunk *chk, *nchk;
7380
7381         /* temp arrays for unlinking */
7382         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7383         int no_fragmentflg, error;
7384         unsigned int max_rwnd_per_dest;
7385         int one_chunk, hbflag, skip_data_for_this_net;
7386         int asconf, cookie, no_out_cnt;
7387         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7388         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7389         int tsns_sent = 0;
7390         uint32_t auth_offset = 0;
7391         struct sctp_auth_chunk *auth = NULL;
7392         uint16_t auth_keyid;
7393         int override_ok = 1;
7394         int data_auth_reqd = 0;
7395
7396         /*
7397          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7398          * destination.
7399          */
7400         int pf_hbflag = 0;
7401         int quit_now = 0;
7402
7403         *num_out = 0;
7404         auth_keyid = stcb->asoc.authinfo.active_keyid;
7405
7406         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7407             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7408             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7409                 eeor_mode = 1;
7410         } else {
7411                 eeor_mode = 0;
7412         }
7413         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7414         /*
7415          * First lets prime the pump. For each destination, if there is room
7416          * in the flight size, attempt to pull an MTU's worth out of the
7417          * stream queues into the general send_queue
7418          */
7419 #ifdef SCTP_AUDITING_ENABLED
7420         sctp_audit_log(0xC2, 2);
7421 #endif
7422         SCTP_TCB_LOCK_ASSERT(stcb);
7423         hbflag = 0;
7424         if ((control_only) || (asoc->stream_reset_outstanding))
7425                 no_data_chunks = 1;
7426         else
7427                 no_data_chunks = 0;
7428
7429         /* Nothing to possible to send? */
7430         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7431             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7432             TAILQ_EMPTY(&asoc->send_queue) &&
7433             TAILQ_EMPTY(&asoc->out_wheel)) {
7434                 *reason_code = 9;
7435                 return (0);
7436         }
7437         if (asoc->peers_rwnd == 0) {
7438                 /* No room in peers rwnd */
7439                 *reason_code = 1;
7440                 if (asoc->total_flight > 0) {
7441                         /* we are allowed one chunk in flight */
7442                         no_data_chunks = 1;
7443                 }
7444         }
7445         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7446         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7447                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7448                         /*
7449                          * This for loop we are in takes in each net, if
7450                          * its's got space in cwnd and has data sent to it
7451                          * (when CMT is off) then it calls
7452                          * sctp_fill_outqueue for the net. This gets data on
7453                          * the send queue for that network.
7454                          *
7455                          * In sctp_fill_outqueue TSN's are assigned and data is
7456                          * copied out of the stream buffers. Note mostly
7457                          * copy by reference (we hope).
7458                          */
7459                         net->window_probe = 0;
7460                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7462                                         sctp_log_cwnd(stcb, net, 1,
7463                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7464                                 }
7465                                 continue;
7466                         }
7467                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7468                                 /* nothing can be in queue for this guy */
7469                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7470                                         sctp_log_cwnd(stcb, net, 2,
7471                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7472                                 }
7473                                 continue;
7474                         }
7475                         if (net->flight_size >= net->cwnd) {
7476                                 /* skip this network, no room - can't fill */
7477                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7478                                         sctp_log_cwnd(stcb, net, 3,
7479                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7480                                 }
7481                                 continue;
7482                         }
7483                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7484                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7485                         }
7486                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7487                         if (quit_now) {
7488                                 /* memory alloc failure */
7489                                 no_data_chunks = 1;
7490                                 break;
7491                         }
7492                 }
7493         }
7494         /* now service each destination and send out what we can for it */
7495         /* Nothing to send? */
7496         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7497             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7498             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7499                 *reason_code = 8;
7500                 return (0);
7501         }
7502         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7503                 /* get the last start point */
7504                 start_at = asoc->last_net_cmt_send_started;
7505                 if (start_at == NULL) {
7506                         /* null so to beginning */
7507                         start_at = TAILQ_FIRST(&asoc->nets);
7508                 } else {
7509                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7510                         if (start_at == NULL) {
7511                                 start_at = TAILQ_FIRST(&asoc->nets);
7512                         }
7513                 }
7514                 asoc->last_net_cmt_send_started = start_at;
7515         } else {
7516                 start_at = TAILQ_FIRST(&asoc->nets);
7517         }
7518         old_start_at = NULL;
7519 again_one_more_time:
7520         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7521                 /* how much can we send? */
7522                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7523                 if (old_start_at && (old_start_at == net)) {
7524                         /* through list ocmpletely. */
7525                         break;
7526                 }
7527                 tsns_sent = 0xa;
7528                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7529                         /*
7530                          * Ref-count of 1 so we cannot have data or control
7531                          * queued to this address. Skip it (non-CMT).
7532                          */
7533                         continue;
7534                 }
7535                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7536                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7537                     (net->flight_size >= net->cwnd)) {
7538                         /*
7539                          * Nothing on control or asconf and flight is full,
7540                          * we can skip even in the CMT case.
7541                          */
7542                         continue;
7543                 }
7544                 ctl_cnt = bundle_at = 0;
7545                 endoutchain = outchain = NULL;
7546                 no_fragmentflg = 1;
7547                 one_chunk = 0;
7548                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7549                         skip_data_for_this_net = 1;
7550                 } else {
7551                         skip_data_for_this_net = 0;
7552                 }
7553                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7554                         /*
7555                          * if we have a route and an ifp check to see if we
7556                          * have room to send to this guy
7557                          */
7558                         struct ifnet *ifp;
7559
7560                         ifp = net->ro.ro_rt->rt_ifp;
7561                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7562                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7563                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7564                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7565                                 }
7566                                 continue;
7567                         }
7568                 }
7569                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7570                 case AF_INET:
7571                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7572                         break;
7573 #ifdef INET6
7574                 case AF_INET6:
7575                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7576                         break;
7577 #endif
7578                 default:
7579                         /* TSNH */
7580                         mtu = net->mtu;
7581                         break;
7582                 }
7583                 mx_mtu = mtu;
7584                 to_out = 0;
7585                 if (mtu > asoc->peers_rwnd) {
7586                         if (asoc->total_flight > 0) {
7587                                 /* We have a packet in flight somewhere */
7588                                 r_mtu = asoc->peers_rwnd;
7589                         } else {
7590                                 /* We are always allowed to send one MTU out */
7591                                 one_chunk = 1;
7592                                 r_mtu = mtu;
7593                         }
7594                 } else {
7595                         r_mtu = mtu;
7596                 }
7597                 /************************/
7598                 /* ASCONF transmission */
7599                 /************************/
7600                 /* Now first lets go through the asconf queue */
7601                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7602                     chk; chk = nchk) {
7603                         nchk = TAILQ_NEXT(chk, sctp_next);
7604                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7605                                 continue;
7606                         }
7607                         if (chk->whoTo != net) {
7608                                 /*
7609                                  * No, not sent to the network we are
7610                                  * looking at
7611                                  */
7612                                 break;
7613                         }
7614                         if (chk->data == NULL) {
7615                                 break;
7616                         }
7617                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7618                             chk->sent != SCTP_DATAGRAM_RESEND) {
7619                                 break;
7620                         }
7621                         /*
7622                          * if no AUTH is yet included and this chunk
7623                          * requires it, make sure to account for it.  We
7624                          * don't apply the size until the AUTH chunk is
7625                          * actually added below in case there is no room for
7626                          * this chunk. NOTE: we overload the use of "omtu"
7627                          * here
7628                          */
7629                         if ((auth == NULL) &&
7630                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7631                             stcb->asoc.peer_auth_chunks)) {
7632                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7633                         } else
7634                                 omtu = 0;
7635                         /* Here we do NOT factor the r_mtu */
7636                         if ((chk->send_size < (int)(mtu - omtu)) ||
7637                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7638                                 /*
7639                                  * We probably should glom the mbuf chain
7640                                  * from the chk->data for control but the
7641                                  * problem is it becomes yet one more level
7642                                  * of tracking to do if for some reason
7643                                  * output fails. Then I have got to
7644                                  * reconstruct the merged control chain.. el
7645                                  * yucko.. for now we take the easy way and
7646                                  * do the copy
7647                                  */
7648                                 /*
7649                                  * Add an AUTH chunk, if chunk requires it
7650                                  * save the offset into the chain for AUTH
7651                                  */
7652                                 if ((auth == NULL) &&
7653                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7654                                     stcb->asoc.peer_auth_chunks))) {
7655                                         outchain = sctp_add_auth_chunk(outchain,
7656                                             &endoutchain,
7657                                             &auth,
7658                                             &auth_offset,
7659                                             stcb,
7660                                             chk->rec.chunk_id.id);
7661                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7662                                 }
7663                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7664                                     (int)chk->rec.chunk_id.can_take_data,
7665                                     chk->send_size, chk->copy_by_ref);
7666                                 if (outchain == NULL) {
7667                                         *reason_code = 8;
7668                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7669                                         return (ENOMEM);
7670                                 }
7671                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7672                                 /* update our MTU size */
7673                                 if (mtu > (chk->send_size + omtu))
7674                                         mtu -= (chk->send_size + omtu);
7675                                 else
7676                                         mtu = 0;
7677                                 to_out += (chk->send_size + omtu);
7678                                 /* Do clear IP_DF ? */
7679                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7680                                         no_fragmentflg = 0;
7681                                 }
7682                                 if (chk->rec.chunk_id.can_take_data)
7683                                         chk->data = NULL;
7684                                 /*
7685                                  * set hb flag since we can use these for
7686                                  * RTO
7687                                  */
7688                                 hbflag = 1;
7689                                 asconf = 1;
7690                                 /*
7691                                  * should sysctl this: don't bundle data
7692                                  * with ASCONF since it requires AUTH
7693                                  */
7694                                 no_data_chunks = 1;
7695                                 chk->sent = SCTP_DATAGRAM_SENT;
7696                                 chk->snd_count++;
7697                                 if (mtu == 0) {
7698                                         /*
7699                                          * Ok we are out of room but we can
7700                                          * output without effecting the
7701                                          * flight size since this little guy
7702                                          * is a control only packet.
7703                                          */
7704                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7705                                         /*
7706                                          * do NOT clear the asconf flag as
7707                                          * it is used to do appropriate
7708                                          * source address selection.
7709                                          */
7710                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7711                                             (struct sockaddr *)&net->ro._l_addr,
7712                                             outchain, auth_offset, auth,
7713                                             stcb->asoc.authinfo.active_keyid,
7714                                             no_fragmentflg, 0, NULL, asconf,
7715                                             inp->sctp_lport, stcb->rport,
7716                                             htonl(stcb->asoc.peer_vtag),
7717                                             net->port, so_locked, NULL))) {
7718                                                 if (error == ENOBUFS) {
7719                                                         asoc->ifp_had_enobuf = 1;
7720                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7721                                                 }
7722                                                 if (from_where == 0) {
7723                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7724                                                 }
7725                                                 if (*now_filled == 0) {
7726                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7727                                                         *now_filled = 1;
7728                                                         *now = net->last_sent_time;
7729                                                 } else {
7730                                                         net->last_sent_time = *now;
7731                                                 }
7732                                                 hbflag = 0;
7733                                                 /* error, could not output */
7734                                                 if (error == EHOSTUNREACH) {
7735                                                         /*
7736                                                          * Destination went
7737                                                          * unreachable
7738                                                          * during this send
7739                                                          */
7740                                                         sctp_move_to_an_alt(stcb, asoc, net);
7741                                                 }
7742                                                 *reason_code = 7;
7743                                                 continue;
7744                                         } else
7745                                                 asoc->ifp_had_enobuf = 0;
7746                                         if (*now_filled == 0) {
7747                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7748                                                 *now_filled = 1;
7749                                                 *now = net->last_sent_time;
7750                                         } else {
7751                                                 net->last_sent_time = *now;
7752                                         }
7753                                         hbflag = 0;
7754                                         /*
7755                                          * increase the number we sent, if a
7756                                          * cookie is sent we don't tell them
7757                                          * any was sent out.
7758                                          */
7759                                         outchain = endoutchain = NULL;
7760                                         auth = NULL;
7761                                         auth_offset = 0;
7762                                         if (!no_out_cnt)
7763                                                 *num_out += ctl_cnt;
7764                                         /* recalc a clean slate and setup */
7765                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7766                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7767                                         } else {
7768                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7769                                         }
7770                                         to_out = 0;
7771                                         no_fragmentflg = 1;
7772                                 }
7773                         }
7774                 }
7775                 /************************/
7776                 /* Control transmission */
7777                 /************************/
7778                 /* Now first lets go through the control queue */
7779                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7780                     chk; chk = nchk) {
7781                         nchk = TAILQ_NEXT(chk, sctp_next);
7782                         if (chk->whoTo != net) {
7783                                 /*
7784                                  * No, not sent to the network we are
7785                                  * looking at
7786                                  */
7787                                 continue;
7788                         }
7789                         if (chk->data == NULL) {
7790                                 continue;
7791                         }
7792                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7793                                 /*
7794                                  * It must be unsent. Cookies and ASCONF's
7795                                  * hang around but there timers will force
7796                                  * when marked for resend.
7797                                  */
7798                                 continue;
7799                         }
7800                         /*
7801                          * if no AUTH is yet included and this chunk
7802                          * requires it, make sure to account for it.  We
7803                          * don't apply the size until the AUTH chunk is
7804                          * actually added below in case there is no room for
7805                          * this chunk. NOTE: we overload the use of "omtu"
7806                          * here
7807                          */
7808                         if ((auth == NULL) &&
7809                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7810                             stcb->asoc.peer_auth_chunks)) {
7811                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7812                         } else
7813                                 omtu = 0;
7814                         /* Here we do NOT factor the r_mtu */
7815                         if ((chk->send_size < (int)(mtu - omtu)) ||
7816                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7817                                 /*
7818                                  * We probably should glom the mbuf chain
7819                                  * from the chk->data for control but the
7820                                  * problem is it becomes yet one more level
7821                                  * of tracking to do if for some reason
7822                                  * output fails. Then I have got to
7823                                  * reconstruct the merged control chain.. el
7824                                  * yucko.. for now we take the easy way and
7825                                  * do the copy
7826                                  */
7827                                 /*
7828                                  * Add an AUTH chunk, if chunk requires it
7829                                  * save the offset into the chain for AUTH
7830                                  */
7831                                 if ((auth == NULL) &&
7832                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7833                                     stcb->asoc.peer_auth_chunks))) {
7834                                         outchain = sctp_add_auth_chunk(outchain,
7835                                             &endoutchain,
7836                                             &auth,
7837                                             &auth_offset,
7838                                             stcb,
7839                                             chk->rec.chunk_id.id);
7840                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7841                                 }
7842                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7843                                     (int)chk->rec.chunk_id.can_take_data,
7844                                     chk->send_size, chk->copy_by_ref);
7845                                 if (outchain == NULL) {
7846                                         *reason_code = 8;
7847                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7848                                         return (ENOMEM);
7849                                 }
7850                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7851                                 /* update our MTU size */
7852                                 if (mtu > (chk->send_size + omtu))
7853                                         mtu -= (chk->send_size + omtu);
7854                                 else
7855                                         mtu = 0;
7856                                 to_out += (chk->send_size + omtu);
7857                                 /* Do clear IP_DF ? */
7858                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7859                                         no_fragmentflg = 0;
7860                                 }
7861                                 if (chk->rec.chunk_id.can_take_data)
7862                                         chk->data = NULL;
7863                                 /* Mark things to be removed, if needed */
7864                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7865                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7866                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7867                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7868                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7869                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7870                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7871                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7872                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7873                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7874                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7875
7876                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7877                                                 hbflag = 1;
7878                                                 /*
7879                                                  * JRS 5/14/07 - Set the
7880                                                  * flag to say a heartbeat
7881                                                  * is being sent.
7882                                                  */
7883                                                 pf_hbflag = 1;
7884                                         }
7885                                         /* remove these chunks at the end */
7886                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7887                                                 /* turn off the timer */
7888                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7889                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7890                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7891                                                 }
7892                                         }
7893                                         /*
7894                                          * EY -Nr-sack version of the above
7895                                          * if statement
7896                                          */
7897                                         if ((SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) &&
7898                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {  /* EY !?! */
7899                                                 /* turn off the timer */
7900                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7901                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7902                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7903                                                 }
7904                                         }
7905                                         ctl_cnt++;
7906                                 } else {
7907                                         /*
7908                                          * Other chunks, since they have
7909                                          * timers running (i.e. COOKIE) we
7910                                          * just "trust" that it gets sent or
7911                                          * retransmitted.
7912                                          */
7913                                         ctl_cnt++;
7914                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7915                                                 cookie = 1;
7916                                                 no_out_cnt = 1;
7917                                         }
7918                                         chk->sent = SCTP_DATAGRAM_SENT;
7919                                         chk->snd_count++;
7920                                 }
7921                                 if (mtu == 0) {
7922                                         /*
7923                                          * Ok we are out of room but we can
7924                                          * output without effecting the
7925                                          * flight size since this little guy
7926                                          * is a control only packet.
7927                                          */
7928                                         if (asconf) {
7929                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7930                                                 /*
7931                                                  * do NOT clear the asconf
7932                                                  * flag as it is used to do
7933                                                  * appropriate source
7934                                                  * address selection.
7935                                                  */
7936                                         }
7937                                         if (cookie) {
7938                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7939                                                 cookie = 0;
7940                                         }
7941                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7942                                             (struct sockaddr *)&net->ro._l_addr,
7943                                             outchain,
7944                                             auth_offset, auth,
7945                                             stcb->asoc.authinfo.active_keyid,
7946                                             no_fragmentflg, 0, NULL, asconf,
7947                                             inp->sctp_lport, stcb->rport,
7948                                             htonl(stcb->asoc.peer_vtag),
7949                                             net->port, so_locked, NULL))) {
7950                                                 if (error == ENOBUFS) {
7951                                                         asoc->ifp_had_enobuf = 1;
7952                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7953                                                 }
7954                                                 if (from_where == 0) {
7955                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7956                                                 }
7957                                                 /* error, could not output */
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                                                 if (error == EHOSTUNREACH) {
7969                                                         /*
7970                                                          * Destination went
7971                                                          * unreachable
7972                                                          * during this send
7973                                                          */
7974                                                         sctp_move_to_an_alt(stcb, asoc, net);
7975                                                 }
7976                                                 *reason_code = 7;
7977                                                 continue;
7978                                         } else
7979                                                 asoc->ifp_had_enobuf = 0;
7980                                         /* Only HB or ASCONF advances time */
7981                                         if (hbflag) {
7982                                                 if (*now_filled == 0) {
7983                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7984                                                         *now_filled = 1;
7985                                                         *now = net->last_sent_time;
7986                                                 } else {
7987                                                         net->last_sent_time = *now;
7988                                                 }
7989                                                 hbflag = 0;
7990                                         }
7991                                         /*
7992                                          * increase the number we sent, if a
7993                                          * cookie is sent we don't tell them
7994                                          * any was sent out.
7995                                          */
7996                                         outchain = endoutchain = NULL;
7997                                         auth = NULL;
7998                                         auth_offset = 0;
7999                                         if (!no_out_cnt)
8000                                                 *num_out += ctl_cnt;
8001                                         /* recalc a clean slate and setup */
8002                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8003                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8004                                         } else {
8005                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8006                                         }
8007                                         to_out = 0;
8008                                         no_fragmentflg = 1;
8009                                 }
8010                         }
8011                 }
8012                 /* JRI: if dest is in PF state, do not send data to it */
8013                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8014                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8015                     (net->dest_state & SCTP_ADDR_PF)) {
8016                         goto no_data_fill;
8017                 }
8018                 if (net->flight_size >= net->cwnd) {
8019                         goto no_data_fill;
8020                 }
8021                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) &&
8022                     (net->flight_size > max_rwnd_per_dest)) {
8023                         goto no_data_fill;
8024                 }
8025                 /*********************/
8026                 /* Data transmission */
8027                 /*********************/
8028                 /*
8029                  * if AUTH for DATA is required and no AUTH has been added
8030                  * yet, account for this in the mtu now... if no data can be
8031                  * bundled, this adjustment won't matter anyways since the
8032                  * packet will be going out...
8033                  */
8034                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8035                     stcb->asoc.peer_auth_chunks);
8036                 if (data_auth_reqd && (auth == NULL)) {
8037                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8038                 }
8039                 /* now lets add any data within the MTU constraints */
8040                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8041                 case AF_INET:
8042                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8043                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8044                         else
8045                                 omtu = 0;
8046                         break;
8047 #ifdef INET6
8048                 case AF_INET6:
8049                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8050                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8051                         else
8052                                 omtu = 0;
8053                         break;
8054 #endif
8055                 default:
8056                         /* TSNH */
8057                         omtu = 0;
8058                         break;
8059                 }
8060                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8061                     (skip_data_for_this_net == 0)) ||
8062                     (cookie)) {
8063                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8064                                 if (no_data_chunks) {
8065                                         /* let only control go out */
8066                                         *reason_code = 1;
8067                                         break;
8068                                 }
8069                                 if (net->flight_size >= net->cwnd) {
8070                                         /* skip this net, no room for data */
8071                                         *reason_code = 2;
8072                                         break;
8073                                 }
8074                                 nchk = TAILQ_NEXT(chk, sctp_next);
8075                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
8076                                         if (chk->whoTo != net) {
8077                                                 /*
8078                                                  * For CMT, steal the data
8079                                                  * to this network if its
8080                                                  * not set here.
8081                                                  */
8082                                                 sctp_free_remote_addr(chk->whoTo);
8083                                                 chk->whoTo = net;
8084                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8085                                         }
8086                                 } else if (chk->whoTo != net) {
8087                                         /* No, not sent to this net */
8088                                         continue;
8089                                 }
8090                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8091                                         /*-
8092                                          * strange, we have a chunk that is
8093                                          * to big for its destination and
8094                                          * yet no fragment ok flag.
8095                                          * Something went wrong when the
8096                                          * PMTU changed...we did not mark
8097                                          * this chunk for some reason?? I
8098                                          * will fix it here by letting IP
8099                                          * fragment it for now and printing
8100                                          * a warning. This really should not
8101                                          * happen ...
8102                                          */
8103                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8104                                             chk->send_size, mtu);
8105                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8106                                 }
8107                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8108                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8109                                         struct sctp_data_chunk *dchkh;
8110
8111                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8112                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8113                                 }
8114                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8115                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8116                                         /* ok we will add this one */
8117
8118                                         /*
8119                                          * Add an AUTH chunk, if chunk
8120                                          * requires it, save the offset into
8121                                          * the chain for AUTH
8122                                          */
8123                                         if (data_auth_reqd) {
8124                                                 if (auth == NULL) {
8125                                                         outchain = sctp_add_auth_chunk(outchain,
8126                                                             &endoutchain,
8127                                                             &auth,
8128                                                             &auth_offset,
8129                                                             stcb,
8130                                                             SCTP_DATA);
8131                                                         auth_keyid = chk->auth_keyid;
8132                                                         override_ok = 0;
8133                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8134                                                 } else if (override_ok) {
8135                                                         /*
8136                                                          * use this data's
8137                                                          * keyid
8138                                                          */
8139                                                         auth_keyid = chk->auth_keyid;
8140                                                         override_ok = 0;
8141                                                 } else if (auth_keyid != chk->auth_keyid) {
8142                                                         /*
8143                                                          * different keyid,
8144                                                          * so done bundling
8145                                                          */
8146                                                         break;
8147                                                 }
8148                                         }
8149                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8150                                             chk->send_size, chk->copy_by_ref);
8151                                         if (outchain == NULL) {
8152                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8153                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8154                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8155                                                 }
8156                                                 *reason_code = 3;
8157                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8158                                                 return (ENOMEM);
8159                                         }
8160                                         /* upate our MTU size */
8161                                         /* Do clear IP_DF ? */
8162                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8163                                                 no_fragmentflg = 0;
8164                                         }
8165                                         /* unsigned subtraction of mtu */
8166                                         if (mtu > chk->send_size)
8167                                                 mtu -= chk->send_size;
8168                                         else
8169                                                 mtu = 0;
8170                                         /* unsigned subtraction of r_mtu */
8171                                         if (r_mtu > chk->send_size)
8172                                                 r_mtu -= chk->send_size;
8173                                         else
8174                                                 r_mtu = 0;
8175
8176                                         to_out += chk->send_size;
8177                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8178 #ifdef INVARIANTS
8179                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8180 #else
8181                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8182                                                     mx_mtu, to_out);
8183 #endif
8184                                         }
8185                                         chk->window_probe = 0;
8186                                         data_list[bundle_at++] = chk;
8187                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8188                                                 mtu = 0;
8189                                                 break;
8190                                         }
8191                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8192                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8193                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8194                                                 } else {
8195                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8196                                                 }
8197                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8198                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8199                                                         /*
8200                                                          * Count number of
8201                                                          * user msg's that
8202                                                          * were fragmented
8203                                                          * we do this by
8204                                                          * counting when we
8205                                                          * see a LAST
8206                                                          * fragment only.
8207                                                          */
8208                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8209                                         }
8210                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8211                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8212                                                         data_list[0]->window_probe = 1;
8213                                                         net->window_probe = 1;
8214                                                 }
8215                                                 break;
8216                                         }
8217                                 } else {
8218                                         /*
8219                                          * Must be sent in order of the
8220                                          * TSN's (on a network)
8221                                          */
8222                                         break;
8223                                 }
8224                         }       /* for (chunk gather loop for this net) */
8225                 }               /* if asoc.state OPEN */
8226 no_data_fill:
8227                 /* Is there something to send for this destination? */
8228                 if (outchain) {
8229                         /* We may need to start a control timer or two */
8230                         if (asconf) {
8231                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8232                                     stcb, net);
8233                                 /*
8234                                  * do NOT clear the asconf flag as it is
8235                                  * used to do appropriate source address
8236                                  * selection.
8237                                  */
8238                         }
8239                         if (cookie) {
8240                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8241                                 cookie = 0;
8242                         }
8243                         /* must start a send timer if data is being sent */
8244                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8245                                 /*
8246                                  * no timer running on this destination
8247                                  * restart it.
8248                                  */
8249                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8250                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8251                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8252                                     pf_hbflag &&
8253                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8254                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8255                                 /*
8256                                  * JRS 5/14/07 - If a HB has been sent to a
8257                                  * PF destination and no T3 timer is
8258                                  * currently running, start the T3 timer to
8259                                  * track the HBs that were sent.
8260                                  */
8261                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8262                         }
8263                         /* Now send it, if there is anything to send :> */
8264                         if ((error = sctp_lowlevel_chunk_output(inp,
8265                             stcb,
8266                             net,
8267                             (struct sockaddr *)&net->ro._l_addr,
8268                             outchain,
8269                             auth_offset,
8270                             auth,
8271                             auth_keyid,
8272                             no_fragmentflg,
8273                             bundle_at,
8274                             data_list[0],
8275                             asconf,
8276                             inp->sctp_lport, stcb->rport,
8277                             htonl(stcb->asoc.peer_vtag),
8278                             net->port, so_locked, NULL))) {
8279                                 /* error, we could not output */
8280                                 if (error == ENOBUFS) {
8281                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8282                                         asoc->ifp_had_enobuf = 1;
8283                                 }
8284                                 if (from_where == 0) {
8285                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8286                                 }
8287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8288                                 if (hbflag) {
8289                                         if (*now_filled == 0) {
8290                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8291                                                 *now_filled = 1;
8292                                                 *now = net->last_sent_time;
8293                                         } else {
8294                                                 net->last_sent_time = *now;
8295                                         }
8296                                         hbflag = 0;
8297                                 }
8298                                 if (error == EHOSTUNREACH) {
8299                                         /*
8300                                          * Destination went unreachable
8301                                          * during this send
8302                                          */
8303                                         sctp_move_to_an_alt(stcb, asoc, net);
8304                                 }
8305                                 *reason_code = 6;
8306                                 /*-
8307                                  * I add this line to be paranoid. As far as
8308                                  * I can tell the continue, takes us back to
8309                                  * the top of the for, but just to make sure
8310                                  * I will reset these again here.
8311                                  */
8312                                 ctl_cnt = bundle_at = 0;
8313                                 continue;       /* This takes us back to the
8314                                                  * for() for the nets. */
8315                         } else {
8316                                 asoc->ifp_had_enobuf = 0;
8317                         }
8318                         outchain = endoutchain = NULL;
8319                         auth = NULL;
8320                         auth_offset = 0;
8321                         if (bundle_at || hbflag) {
8322                                 /* For data/asconf and hb set time */
8323                                 if (*now_filled == 0) {
8324                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8325                                         *now_filled = 1;
8326                                         *now = net->last_sent_time;
8327                                 } else {
8328                                         net->last_sent_time = *now;
8329                                 }
8330                         }
8331                         if (!no_out_cnt) {
8332                                 *num_out += (ctl_cnt + bundle_at);
8333                         }
8334                         if (bundle_at) {
8335                                 /* setup for a RTO measurement */
8336                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8337                                 /* fill time if not already filled */
8338                                 if (*now_filled == 0) {
8339                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8340                                         *now_filled = 1;
8341                                         *now = asoc->time_last_sent;
8342                                 } else {
8343                                         asoc->time_last_sent = *now;
8344                                 }
8345                                 data_list[0]->do_rtt = 1;
8346                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8347                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8348                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8349                                         if (net->flight_size < net->cwnd) {
8350                                                 /* start or restart it */
8351                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8352                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8353                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8354                                                 }
8355                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8356                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8357                                         } else {
8358                                                 /* stop it if its running */
8359                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8360                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8361                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8362                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8363                                                 }
8364                                         }
8365                                 }
8366                         }
8367                         if (one_chunk) {
8368                                 break;
8369                         }
8370                 }
8371                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8372                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8373                 }
8374         }
8375         if (old_start_at == NULL) {
8376                 old_start_at = start_at;
8377                 start_at = TAILQ_FIRST(&asoc->nets);
8378                 if (old_start_at)
8379                         goto again_one_more_time;
8380         }
8381         /*
8382          * At the end there should be no NON timed chunks hanging on this
8383          * queue.
8384          */
8385         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8386                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8387         }
8388         if ((*num_out == 0) && (*reason_code == 0)) {
8389                 *reason_code = 4;
8390         } else {
8391                 *reason_code = 5;
8392         }
8393         sctp_clean_up_ctl(stcb, asoc);
8394         return (0);
8395 }
8396
8397 void
8398 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8399 {
8400         /*-
8401          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8402          * the control chunk queue.
8403          */
8404         struct sctp_chunkhdr *hdr;
8405         struct sctp_tmit_chunk *chk;
8406         struct mbuf *mat;
8407
8408         SCTP_TCB_LOCK_ASSERT(stcb);
8409         sctp_alloc_a_chunk(stcb, chk);
8410         if (chk == NULL) {
8411                 /* no memory */
8412                 sctp_m_freem(op_err);
8413                 return;
8414         }
8415         chk->copy_by_ref = 0;
8416         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8417         if (op_err == NULL) {
8418                 sctp_free_a_chunk(stcb, chk);
8419                 return;
8420         }
8421         chk->send_size = 0;
8422         mat = op_err;
8423         while (mat != NULL) {
8424                 chk->send_size += SCTP_BUF_LEN(mat);
8425                 mat = SCTP_BUF_NEXT(mat);
8426         }
8427         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8428         chk->rec.chunk_id.can_take_data = 1;
8429         chk->sent = SCTP_DATAGRAM_UNSENT;
8430         chk->snd_count = 0;
8431         chk->flags = 0;
8432         chk->asoc = &stcb->asoc;
8433         chk->data = op_err;
8434         chk->whoTo = chk->asoc->primary_destination;
8435         atomic_add_int(&chk->whoTo->ref_count, 1);
8436         hdr = mtod(op_err, struct sctp_chunkhdr *);
8437         hdr->chunk_type = SCTP_OPERATION_ERROR;
8438         hdr->chunk_flags = 0;
8439         hdr->chunk_length = htons(chk->send_size);
8440         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8441             chk,
8442             sctp_next);
8443         chk->asoc->ctrl_queue_cnt++;
8444 }
8445
8446 int
8447 sctp_send_cookie_echo(struct mbuf *m,
8448     int offset,
8449     struct sctp_tcb *stcb,
8450     struct sctp_nets *net)
8451 {
8452         /*-
8453          * pull out the cookie and put it at the front of the control chunk
8454          * queue.
8455          */
8456         int at;
8457         struct mbuf *cookie;
8458         struct sctp_paramhdr parm, *phdr;
8459         struct sctp_chunkhdr *hdr;
8460         struct sctp_tmit_chunk *chk;
8461         uint16_t ptype, plen;
8462
8463         /* First find the cookie in the param area */
8464         cookie = NULL;
8465         at = offset + sizeof(struct sctp_init_chunk);
8466
8467         SCTP_TCB_LOCK_ASSERT(stcb);
8468         do {
8469                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8470                 if (phdr == NULL) {
8471                         return (-3);
8472                 }
8473                 ptype = ntohs(phdr->param_type);
8474                 plen = ntohs(phdr->param_length);
8475                 if (ptype == SCTP_STATE_COOKIE) {
8476                         int pad;
8477
8478                         /* found the cookie */
8479                         if ((pad = (plen % 4))) {
8480                                 plen += 4 - pad;
8481                         }
8482                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8483                         if (cookie == NULL) {
8484                                 /* No memory */
8485                                 return (-2);
8486                         }
8487 #ifdef SCTP_MBUF_LOGGING
8488                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8489                                 struct mbuf *mat;
8490
8491                                 mat = cookie;
8492                                 while (mat) {
8493                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8494                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8495                                         }
8496                                         mat = SCTP_BUF_NEXT(mat);
8497                                 }
8498                         }
8499 #endif
8500                         break;
8501                 }
8502                 at += SCTP_SIZE32(plen);
8503         } while (phdr);
8504         if (cookie == NULL) {
8505                 /* Did not find the cookie */
8506                 return (-3);
8507         }
8508         /* ok, we got the cookie lets change it into a cookie echo chunk */
8509
8510         /* first the change from param to cookie */
8511         hdr = mtod(cookie, struct sctp_chunkhdr *);
8512         hdr->chunk_type = SCTP_COOKIE_ECHO;
8513         hdr->chunk_flags = 0;
8514         /* get the chunk stuff now and place it in the FRONT of the queue */
8515         sctp_alloc_a_chunk(stcb, chk);
8516         if (chk == NULL) {
8517                 /* no memory */
8518                 sctp_m_freem(cookie);
8519                 return (-5);
8520         }
8521         chk->copy_by_ref = 0;
8522         chk->send_size = plen;
8523         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8524         chk->rec.chunk_id.can_take_data = 0;
8525         chk->sent = SCTP_DATAGRAM_UNSENT;
8526         chk->snd_count = 0;
8527         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8528         chk->asoc = &stcb->asoc;
8529         chk->data = cookie;
8530         chk->whoTo = chk->asoc->primary_destination;
8531         atomic_add_int(&chk->whoTo->ref_count, 1);
8532         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8533         chk->asoc->ctrl_queue_cnt++;
8534         return (0);
8535 }
8536
8537 void
8538 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8539     struct mbuf *m,
8540     int offset,
8541     int chk_length,
8542     struct sctp_nets *net)
8543 {
8544         /*
8545          * take a HB request and make it into a HB ack and send it.
8546          */
8547         struct mbuf *outchain;
8548         struct sctp_chunkhdr *chdr;
8549         struct sctp_tmit_chunk *chk;
8550
8551
8552         if (net == NULL)
8553                 /* must have a net pointer */
8554                 return;
8555
8556         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8557         if (outchain == NULL) {
8558                 /* gak out of memory */
8559                 return;
8560         }
8561 #ifdef SCTP_MBUF_LOGGING
8562         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8563                 struct mbuf *mat;
8564
8565                 mat = outchain;
8566                 while (mat) {
8567                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8568                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8569                         }
8570                         mat = SCTP_BUF_NEXT(mat);
8571                 }
8572         }
8573 #endif
8574         chdr = mtod(outchain, struct sctp_chunkhdr *);
8575         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8576         chdr->chunk_flags = 0;
8577         if (chk_length % 4) {
8578                 /* need pad */
8579                 uint32_t cpthis = 0;
8580                 int padlen;
8581
8582                 padlen = 4 - (chk_length % 4);
8583                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8584         }
8585         sctp_alloc_a_chunk(stcb, chk);
8586         if (chk == NULL) {
8587                 /* no memory */
8588                 sctp_m_freem(outchain);
8589                 return;
8590         }
8591         chk->copy_by_ref = 0;
8592         chk->send_size = chk_length;
8593         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8594         chk->rec.chunk_id.can_take_data = 1;
8595         chk->sent = SCTP_DATAGRAM_UNSENT;
8596         chk->snd_count = 0;
8597         chk->flags = 0;
8598         chk->asoc = &stcb->asoc;
8599         chk->data = outchain;
8600         chk->whoTo = net;
8601         atomic_add_int(&chk->whoTo->ref_count, 1);
8602         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8603         chk->asoc->ctrl_queue_cnt++;
8604 }
8605
8606 void
8607 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8608 {
8609         /* formulate and queue a cookie-ack back to sender */
8610         struct mbuf *cookie_ack;
8611         struct sctp_chunkhdr *hdr;
8612         struct sctp_tmit_chunk *chk;
8613
8614         cookie_ack = NULL;
8615         SCTP_TCB_LOCK_ASSERT(stcb);
8616
8617         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8618         if (cookie_ack == NULL) {
8619                 /* no mbuf's */
8620                 return;
8621         }
8622         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8623         sctp_alloc_a_chunk(stcb, chk);
8624         if (chk == NULL) {
8625                 /* no memory */
8626                 sctp_m_freem(cookie_ack);
8627                 return;
8628         }
8629         chk->copy_by_ref = 0;
8630         chk->send_size = sizeof(struct sctp_chunkhdr);
8631         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8632         chk->rec.chunk_id.can_take_data = 1;
8633         chk->sent = SCTP_DATAGRAM_UNSENT;
8634         chk->snd_count = 0;
8635         chk->flags = 0;
8636         chk->asoc = &stcb->asoc;
8637         chk->data = cookie_ack;
8638         if (chk->asoc->last_control_chunk_from != NULL) {
8639                 chk->whoTo = chk->asoc->last_control_chunk_from;
8640         } else {
8641                 chk->whoTo = chk->asoc->primary_destination;
8642         }
8643         atomic_add_int(&chk->whoTo->ref_count, 1);
8644         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8645         hdr->chunk_type = SCTP_COOKIE_ACK;
8646         hdr->chunk_flags = 0;
8647         hdr->chunk_length = htons(chk->send_size);
8648         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8649         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8650         chk->asoc->ctrl_queue_cnt++;
8651         return;
8652 }
8653
8654
8655 void
8656 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8657 {
8658         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8659         struct mbuf *m_shutdown_ack;
8660         struct sctp_shutdown_ack_chunk *ack_cp;
8661         struct sctp_tmit_chunk *chk;
8662
8663         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8664         if (m_shutdown_ack == NULL) {
8665                 /* no mbuf's */
8666                 return;
8667         }
8668         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8669         sctp_alloc_a_chunk(stcb, chk);
8670         if (chk == NULL) {
8671                 /* no memory */
8672                 sctp_m_freem(m_shutdown_ack);
8673                 return;
8674         }
8675         chk->copy_by_ref = 0;
8676         chk->send_size = sizeof(struct sctp_chunkhdr);
8677         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8678         chk->rec.chunk_id.can_take_data = 1;
8679         chk->sent = SCTP_DATAGRAM_UNSENT;
8680         chk->snd_count = 0;
8681         chk->flags = 0;
8682         chk->asoc = &stcb->asoc;
8683         chk->data = m_shutdown_ack;
8684         chk->whoTo = net;
8685         atomic_add_int(&net->ref_count, 1);
8686
8687         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8688         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8689         ack_cp->ch.chunk_flags = 0;
8690         ack_cp->ch.chunk_length = htons(chk->send_size);
8691         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8692         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8693         chk->asoc->ctrl_queue_cnt++;
8694         return;
8695 }
8696
8697 void
8698 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8699 {
8700         /* formulate and queue a SHUTDOWN to the sender */
8701         struct mbuf *m_shutdown;
8702         struct sctp_shutdown_chunk *shutdown_cp;
8703         struct sctp_tmit_chunk *chk;
8704
8705         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8706         if (m_shutdown == NULL) {
8707                 /* no mbuf's */
8708                 return;
8709         }
8710         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8711         sctp_alloc_a_chunk(stcb, chk);
8712         if (chk == NULL) {
8713                 /* no memory */
8714                 sctp_m_freem(m_shutdown);
8715                 return;
8716         }
8717         chk->copy_by_ref = 0;
8718         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8719         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8720         chk->rec.chunk_id.can_take_data = 1;
8721         chk->sent = SCTP_DATAGRAM_UNSENT;
8722         chk->snd_count = 0;
8723         chk->flags = 0;
8724         chk->asoc = &stcb->asoc;
8725         chk->data = m_shutdown;
8726         chk->whoTo = net;
8727         atomic_add_int(&net->ref_count, 1);
8728
8729         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8730         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8731         shutdown_cp->ch.chunk_flags = 0;
8732         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8733         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8734         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8735         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8736         chk->asoc->ctrl_queue_cnt++;
8737         return;
8738 }
8739
8740 void
8741 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8742 {
8743         /*
8744          * formulate and queue an ASCONF to the peer. ASCONF parameters
8745          * should be queued on the assoc queue.
8746          */
8747         struct sctp_tmit_chunk *chk;
8748         struct mbuf *m_asconf;
8749         int len;
8750
8751         SCTP_TCB_LOCK_ASSERT(stcb);
8752
8753         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8754             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8755                 /* can't send a new one if there is one in flight already */
8756                 return;
8757         }
8758         /* compose an ASCONF chunk, maximum length is PMTU */
8759         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8760         if (m_asconf == NULL) {
8761                 return;
8762         }
8763         sctp_alloc_a_chunk(stcb, chk);
8764         if (chk == NULL) {
8765                 /* no memory */
8766                 sctp_m_freem(m_asconf);
8767                 return;
8768         }
8769         chk->copy_by_ref = 0;
8770         chk->data = m_asconf;
8771         chk->send_size = len;
8772         chk->rec.chunk_id.id = SCTP_ASCONF;
8773         chk->rec.chunk_id.can_take_data = 0;
8774         chk->sent = SCTP_DATAGRAM_UNSENT;
8775         chk->snd_count = 0;
8776         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8777         chk->asoc = &stcb->asoc;
8778         chk->whoTo = net;
8779         atomic_add_int(&chk->whoTo->ref_count, 1);
8780         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8781         chk->asoc->ctrl_queue_cnt++;
8782         return;
8783 }
8784
8785 void
8786 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8787 {
8788         /*
8789          * formulate and queue a asconf-ack back to sender. the asconf-ack
8790          * must be stored in the tcb.
8791          */
8792         struct sctp_tmit_chunk *chk;
8793         struct sctp_asconf_ack *ack, *latest_ack;
8794         struct mbuf *m_ack, *m;
8795         struct sctp_nets *net = NULL;
8796
8797         SCTP_TCB_LOCK_ASSERT(stcb);
8798         /* Get the latest ASCONF-ACK */
8799         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8800         if (latest_ack == NULL) {
8801                 return;
8802         }
8803         if (latest_ack->last_sent_to != NULL &&
8804             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8805                 /* we're doing a retransmission */
8806                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8807                 if (net == NULL) {
8808                         /* no alternate */
8809                         if (stcb->asoc.last_control_chunk_from == NULL)
8810                                 net = stcb->asoc.primary_destination;
8811                         else
8812                                 net = stcb->asoc.last_control_chunk_from;
8813                 }
8814         } else {
8815                 /* normal case */
8816                 if (stcb->asoc.last_control_chunk_from == NULL)
8817                         net = stcb->asoc.primary_destination;
8818                 else
8819                         net = stcb->asoc.last_control_chunk_from;
8820         }
8821         latest_ack->last_sent_to = net;
8822
8823         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8824                 if (ack->data == NULL) {
8825                         continue;
8826                 }
8827                 /* copy the asconf_ack */
8828                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8829                 if (m_ack == NULL) {
8830                         /* couldn't copy it */
8831                         return;
8832                 }
8833 #ifdef SCTP_MBUF_LOGGING
8834                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8835                         struct mbuf *mat;
8836
8837                         mat = m_ack;
8838                         while (mat) {
8839                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8840                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8841                                 }
8842                                 mat = SCTP_BUF_NEXT(mat);
8843                         }
8844                 }
8845 #endif
8846
8847                 sctp_alloc_a_chunk(stcb, chk);
8848                 if (chk == NULL) {
8849                         /* no memory */
8850                         if (m_ack)
8851                                 sctp_m_freem(m_ack);
8852                         return;
8853                 }
8854                 chk->copy_by_ref = 0;
8855
8856                 chk->whoTo = net;
8857                 chk->data = m_ack;
8858                 chk->send_size = 0;
8859                 /* Get size */
8860                 m = m_ack;
8861                 chk->send_size = ack->len;
8862                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8863                 chk->rec.chunk_id.can_take_data = 1;
8864                 chk->sent = SCTP_DATAGRAM_UNSENT;
8865                 chk->snd_count = 0;
8866                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8867                 chk->asoc = &stcb->asoc;
8868                 atomic_add_int(&chk->whoTo->ref_count, 1);
8869
8870                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8871                 chk->asoc->ctrl_queue_cnt++;
8872         }
8873         return;
8874 }
8875
8876
8877 static int
8878 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8879     struct sctp_tcb *stcb,
8880     struct sctp_association *asoc,
8881     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8882 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8883     SCTP_UNUSED
8884 #endif
8885 )
8886 {
8887         /*-
8888          * send out one MTU of retransmission. If fast_retransmit is
8889          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8890          * rwnd. For a Cookie or Asconf in the control chunk queue we
8891          * retransmit them by themselves.
8892          *
8893          * For data chunks we will pick out the lowest TSN's in the sent_queue
8894          * marked for resend and bundle them all together (up to a MTU of
8895          * destination). The address to send to should have been
8896          * selected/changed where the retransmission was marked (i.e. in FR
8897          * or t3-timeout routines).
8898          */
8899         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8900         struct sctp_tmit_chunk *chk, *fwd;
8901         struct mbuf *m, *endofchain;
8902         struct sctp_nets *net = NULL;
8903         uint32_t tsns_sent = 0;
8904         int no_fragmentflg, bundle_at, cnt_thru;
8905         unsigned int mtu;
8906         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8907         struct sctp_auth_chunk *auth = NULL;
8908         uint32_t auth_offset = 0;
8909         uint16_t auth_keyid;
8910         int override_ok = 1;
8911         int data_auth_reqd = 0;
8912         uint32_t dmtu = 0;
8913
8914         SCTP_TCB_LOCK_ASSERT(stcb);
8915         tmr_started = ctl_cnt = bundle_at = error = 0;
8916         no_fragmentflg = 1;
8917         fwd_tsn = 0;
8918         *cnt_out = 0;
8919         fwd = NULL;
8920         endofchain = m = NULL;
8921         auth_keyid = stcb->asoc.authinfo.active_keyid;
8922 #ifdef SCTP_AUDITING_ENABLED
8923         sctp_audit_log(0xC3, 1);
8924 #endif
8925         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8926             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8927                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8928                     asoc->sent_queue_retran_cnt);
8929                 asoc->sent_queue_cnt = 0;
8930                 asoc->sent_queue_cnt_removeable = 0;
8931                 /* send back 0/0 so we enter normal transmission */
8932                 *cnt_out = 0;
8933                 return (0);
8934         }
8935         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8936                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8937                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8938                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8939                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8940                                 if (chk != asoc->str_reset) {
8941                                         /*
8942                                          * not eligible for retran if its
8943                                          * not ours
8944                                          */
8945                                         continue;
8946                                 }
8947                         }
8948                         ctl_cnt++;
8949                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8950                                 fwd_tsn = 1;
8951                                 fwd = chk;
8952                         }
8953                         /*
8954                          * Add an AUTH chunk, if chunk requires it save the
8955                          * offset into the chain for AUTH
8956                          */
8957                         if ((auth == NULL) &&
8958                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8959                             stcb->asoc.peer_auth_chunks))) {
8960                                 m = sctp_add_auth_chunk(m, &endofchain,
8961                                     &auth, &auth_offset,
8962                                     stcb,
8963                                     chk->rec.chunk_id.id);
8964                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8965                         }
8966                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8967                         break;
8968                 }
8969         }
8970         one_chunk = 0;
8971         cnt_thru = 0;
8972         /* do we have control chunks to retransmit? */
8973         if (m != NULL) {
8974                 /* Start a timer no matter if we suceed or fail */
8975                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8976                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8977                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8978                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8979                 chk->snd_count++;       /* update our count */
8980                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8981                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
8982                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
8983                     no_fragmentflg, 0, NULL, 0,
8984                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
8985                     chk->whoTo->port, so_locked, NULL))) {
8986                         SCTP_STAT_INCR(sctps_lowlevelerr);
8987                         return (error);
8988                 }
8989                 m = endofchain = NULL;
8990                 auth = NULL;
8991                 auth_offset = 0;
8992                 /*
8993                  * We don't want to mark the net->sent time here since this
8994                  * we use this for HB and retrans cannot measure RTT
8995                  */
8996                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8997                 *cnt_out += 1;
8998                 chk->sent = SCTP_DATAGRAM_SENT;
8999                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9000                 if (fwd_tsn == 0) {
9001                         return (0);
9002                 } else {
9003                         /* Clean up the fwd-tsn list */
9004                         sctp_clean_up_ctl(stcb, asoc);
9005                         return (0);
9006                 }
9007         }
9008         /*
9009          * Ok, it is just data retransmission we need to do or that and a
9010          * fwd-tsn with it all.
9011          */
9012         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9013                 return (SCTP_RETRAN_DONE);
9014         }
9015         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9016             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9017                 /* not yet open, resend the cookie and that is it */
9018                 return (1);
9019         }
9020 #ifdef SCTP_AUDITING_ENABLED
9021         sctp_auditing(20, inp, stcb, NULL);
9022 #endif
9023         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9024         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9025                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9026                         /* No, not sent to this net or not ready for rtx */
9027                         continue;
9028                 }
9029                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9030                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9031                         /* Gak, we have exceeded max unlucky retran, abort! */
9032                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9033                             chk->snd_count,
9034                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9035                         atomic_add_int(&stcb->asoc.refcnt, 1);
9036                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9037                         SCTP_TCB_LOCK(stcb);
9038                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9039                         return (SCTP_RETRAN_EXIT);
9040                 }
9041                 /* pick up the net */
9042                 net = chk->whoTo;
9043                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9044                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9045                 } else {
9046                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9047                 }
9048
9049                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9050                         /* No room in peers rwnd */
9051                         uint32_t tsn;
9052
9053                         tsn = asoc->last_acked_seq + 1;
9054                         if (tsn == chk->rec.data.TSN_seq) {
9055                                 /*
9056                                  * we make a special exception for this
9057                                  * case. The peer has no rwnd but is missing
9058                                  * the lowest chunk.. which is probably what
9059                                  * is holding up the rwnd.
9060                                  */
9061                                 goto one_chunk_around;
9062                         }
9063                         return (1);
9064                 }
9065 one_chunk_around:
9066                 if (asoc->peers_rwnd < mtu) {
9067                         one_chunk = 1;
9068                         if ((asoc->peers_rwnd == 0) &&
9069                             (asoc->total_flight == 0)) {
9070                                 chk->window_probe = 1;
9071                                 chk->whoTo->window_probe = 1;
9072                         }
9073                 }
9074 #ifdef SCTP_AUDITING_ENABLED
9075                 sctp_audit_log(0xC3, 2);
9076 #endif
9077                 bundle_at = 0;
9078                 m = NULL;
9079                 net->fast_retran_ip = 0;
9080                 if (chk->rec.data.doing_fast_retransmit == 0) {
9081                         /*
9082                          * if no FR in progress skip destination that have
9083                          * flight_size > cwnd.
9084                          */
9085                         if (net->flight_size >= net->cwnd) {
9086                                 continue;
9087                         }
9088                 } else {
9089                         /*
9090                          * Mark the destination net to have FR recovery
9091                          * limits put on it.
9092                          */
9093                         *fr_done = 1;
9094                         net->fast_retran_ip = 1;
9095                 }
9096
9097                 /*
9098                  * if no AUTH is yet included and this chunk requires it,
9099                  * make sure to account for it.  We don't apply the size
9100                  * until the AUTH chunk is actually added below in case
9101                  * there is no room for this chunk.
9102                  */
9103                 if (data_auth_reqd && (auth == NULL)) {
9104                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9105                 } else
9106                         dmtu = 0;
9107
9108                 if ((chk->send_size <= (mtu - dmtu)) ||
9109                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9110                         /* ok we will add this one */
9111                         if (data_auth_reqd) {
9112                                 if (auth == NULL) {
9113                                         m = sctp_add_auth_chunk(m,
9114                                             &endofchain,
9115                                             &auth,
9116                                             &auth_offset,
9117                                             stcb,
9118                                             SCTP_DATA);
9119                                         auth_keyid = chk->auth_keyid;
9120                                         override_ok = 0;
9121                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9122                                 } else if (override_ok) {
9123                                         auth_keyid = chk->auth_keyid;
9124                                         override_ok = 0;
9125                                 } else if (chk->auth_keyid != auth_keyid) {
9126                                         /* different keyid, so done bundling */
9127                                         break;
9128                                 }
9129                         }
9130                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9131                         if (m == NULL) {
9132                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9133                                 return (ENOMEM);
9134                         }
9135                         /* Do clear IP_DF ? */
9136                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9137                                 no_fragmentflg = 0;
9138                         }
9139                         /* upate our MTU size */
9140                         if (mtu > (chk->send_size + dmtu))
9141                                 mtu -= (chk->send_size + dmtu);
9142                         else
9143                                 mtu = 0;
9144                         data_list[bundle_at++] = chk;
9145                         if (one_chunk && (asoc->total_flight <= 0)) {
9146                                 SCTP_STAT_INCR(sctps_windowprobed);
9147                         }
9148                 }
9149                 if (one_chunk == 0) {
9150                         /*
9151                          * now are there anymore forward from chk to pick
9152                          * up?
9153                          */
9154                         fwd = TAILQ_NEXT(chk, sctp_next);
9155                         while (fwd) {
9156                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9157                                         /* Nope, not for retran */
9158                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9159                                         continue;
9160                                 }
9161                                 if (fwd->whoTo != net) {
9162                                         /* Nope, not the net in question */
9163                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9164                                         continue;
9165                                 }
9166                                 if (data_auth_reqd && (auth == NULL)) {
9167                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9168                                 } else
9169                                         dmtu = 0;
9170                                 if (fwd->send_size <= (mtu - dmtu)) {
9171                                         if (data_auth_reqd) {
9172                                                 if (auth == NULL) {
9173                                                         m = sctp_add_auth_chunk(m,
9174                                                             &endofchain,
9175                                                             &auth,
9176                                                             &auth_offset,
9177                                                             stcb,
9178                                                             SCTP_DATA);
9179                                                         auth_keyid = fwd->auth_keyid;
9180                                                         override_ok = 0;
9181                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9182                                                 } else if (override_ok) {
9183                                                         auth_keyid = fwd->auth_keyid;
9184                                                         override_ok = 0;
9185                                                 } else if (fwd->auth_keyid != auth_keyid) {
9186                                                         /*
9187                                                          * different keyid,
9188                                                          * so done bundling
9189                                                          */
9190                                                         break;
9191                                                 }
9192                                         }
9193                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9194                                         if (m == NULL) {
9195                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9196                                                 return (ENOMEM);
9197                                         }
9198                                         /* Do clear IP_DF ? */
9199                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9200                                                 no_fragmentflg = 0;
9201                                         }
9202                                         /* upate our MTU size */
9203                                         if (mtu > (fwd->send_size + dmtu))
9204                                                 mtu -= (fwd->send_size + dmtu);
9205                                         else
9206                                                 mtu = 0;
9207                                         data_list[bundle_at++] = fwd;
9208                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9209                                                 break;
9210                                         }
9211                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9212                                 } else {
9213                                         /* can't fit so we are done */
9214                                         break;
9215                                 }
9216                         }
9217                 }
9218                 /* Is there something to send for this destination? */
9219                 if (m) {
9220                         /*
9221                          * No matter if we fail/or suceed we should start a
9222                          * timer. A failure is like a lost IP packet :-)
9223                          */
9224                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9225                                 /*
9226                                  * no timer running on this destination
9227                                  * restart it.
9228                                  */
9229                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9230                                 tmr_started = 1;
9231                         }
9232                         /* Now lets send it, if there is anything to send :> */
9233                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9234                             (struct sockaddr *)&net->ro._l_addr, m,
9235                             auth_offset, auth, auth_keyid,
9236                             no_fragmentflg, 0, NULL, 0,
9237                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9238                             net->port, so_locked, NULL))) {
9239                                 /* error, we could not output */
9240                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9241                                 return (error);
9242                         }
9243                         m = endofchain = NULL;
9244                         auth = NULL;
9245                         auth_offset = 0;
9246                         /* For HB's */
9247                         /*
9248                          * We don't want to mark the net->sent time here
9249                          * since this we use this for HB and retrans cannot
9250                          * measure RTT
9251                          */
9252                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9253
9254                         /* For auto-close */
9255                         cnt_thru++;
9256                         if (*now_filled == 0) {
9257                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9258                                 *now = asoc->time_last_sent;
9259                                 *now_filled = 1;
9260                         } else {
9261                                 asoc->time_last_sent = *now;
9262                         }
9263                         *cnt_out += bundle_at;
9264 #ifdef SCTP_AUDITING_ENABLED
9265                         sctp_audit_log(0xC4, bundle_at);
9266 #endif
9267                         if (bundle_at) {
9268                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9269                         }
9270                         for (i = 0; i < bundle_at; i++) {
9271                                 SCTP_STAT_INCR(sctps_sendretransdata);
9272                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9273                                 /*
9274                                  * When we have a revoked data, and we
9275                                  * retransmit it, then we clear the revoked
9276                                  * flag since this flag dictates if we
9277                                  * subtracted from the fs
9278                                  */
9279                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9280                                         /* Deflate the cwnd */
9281                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9282                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9283                                 }
9284                                 data_list[i]->snd_count++;
9285                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9286                                 /* record the time */
9287                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9288                                 if (data_list[i]->book_size_scale) {
9289                                         /*
9290                                          * need to double the book size on
9291                                          * this one
9292                                          */
9293                                         data_list[i]->book_size_scale = 0;
9294                                         /*
9295                                          * Since we double the booksize, we
9296                                          * must also double the output queue
9297                                          * size, since this get shrunk when
9298                                          * we free by this amount.
9299                                          */
9300                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9301                                         data_list[i]->book_size *= 2;
9302
9303
9304                                 } else {
9305                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9306                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9307                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9308                                         }
9309                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9310                                             (uint32_t) (data_list[i]->send_size +
9311                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9312                                 }
9313                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9314                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9315                                             data_list[i]->whoTo->flight_size,
9316                                             data_list[i]->book_size,
9317                                             (uintptr_t) data_list[i]->whoTo,
9318                                             data_list[i]->rec.data.TSN_seq);
9319                                 }
9320                                 sctp_flight_size_increase(data_list[i]);
9321                                 sctp_total_flight_increase(stcb, data_list[i]);
9322                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9323                                         /* SWS sender side engages */
9324                                         asoc->peers_rwnd = 0;
9325                                 }
9326                                 if ((i == 0) &&
9327                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9328                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9329                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9330                                             (tmr_started == 0)) {
9331                                                 /*-
9332                                                  * ok we just fast-retrans'd
9333                                                  * the lowest TSN, i.e the
9334                                                  * first on the list. In
9335                                                  * this case we want to give
9336                                                  * some more time to get a
9337                                                  * SACK back without a
9338                                                  * t3-expiring.
9339                                                  */
9340                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9341                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9342                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9343                                         }
9344                                 }
9345                         }
9346                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9347                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9348                         }
9349 #ifdef SCTP_AUDITING_ENABLED
9350                         sctp_auditing(21, inp, stcb, NULL);
9351 #endif
9352                 } else {
9353                         /* None will fit */
9354                         return (1);
9355                 }
9356                 if (asoc->sent_queue_retran_cnt <= 0) {
9357                         /* all done we have no more to retran */
9358                         asoc->sent_queue_retran_cnt = 0;
9359                         break;
9360                 }
9361                 if (one_chunk) {
9362                         /* No more room in rwnd */
9363                         return (1);
9364                 }
9365                 /* stop the for loop here. we sent out a packet */
9366                 break;
9367         }
9368         return (0);
9369 }
9370
9371
9372 static int
9373 sctp_timer_validation(struct sctp_inpcb *inp,
9374     struct sctp_tcb *stcb,
9375     struct sctp_association *asoc,
9376     int ret)
9377 {
9378         struct sctp_nets *net;
9379
9380         /* Validate that a timer is running somewhere */
9381         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9382                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9383                         /* Here is a timer */
9384                         return (ret);
9385                 }
9386         }
9387         SCTP_TCB_LOCK_ASSERT(stcb);
9388         /* Gak, we did not have a timer somewhere */
9389         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9390         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9391         return (ret);
9392 }
9393
9394 void
9395 sctp_chunk_output(struct sctp_inpcb *inp,
9396     struct sctp_tcb *stcb,
9397     int from_where,
9398     int so_locked
9399 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9400     SCTP_UNUSED
9401 #endif
9402 )
9403 {
9404         /*-
9405          * Ok this is the generic chunk service queue. we must do the
9406          * following:
9407          * - See if there are retransmits pending, if so we must
9408          *   do these first.
9409          * - Service the stream queue that is next, moving any
9410          *   message (note I must get a complete message i.e.
9411          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9412          *   TSN's
9413          * - Check to see if the cwnd/rwnd allows any output, if so we
9414          *   go ahead and fomulate and send the low level chunks. Making sure
9415          *   to combine any control in the control chunk queue also.
9416          */
9417         struct sctp_association *asoc;
9418         struct sctp_nets *net;
9419         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9420             burst_cnt = 0, burst_limit = 0;
9421         struct timeval now;
9422         int now_filled = 0;
9423         int nagle_on = 0;
9424         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9425         int un_sent = 0;
9426         int fr_done, tot_frs = 0;
9427
9428         asoc = &stcb->asoc;
9429         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9430                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9431                         nagle_on = 0;
9432                 } else {
9433                         nagle_on = 1;
9434                 }
9435         }
9436         SCTP_TCB_LOCK_ASSERT(stcb);
9437
9438         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9439
9440         if ((un_sent <= 0) &&
9441             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9442             (asoc->sent_queue_retran_cnt == 0)) {
9443                 /* Nothing to do unless there is something to be sent left */
9444                 return;
9445         }
9446         /*
9447          * Do we have something to send, data or control AND a sack timer
9448          * running, if so piggy-back the sack.
9449          */
9450         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9451                 /*
9452                  * EY if nr_sacks used then send an nr-sack , a sack
9453                  * otherwise
9454                  */
9455                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack)
9456                         sctp_send_nr_sack(stcb);
9457                 else
9458                         sctp_send_sack(stcb);
9459                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9460         }
9461         while (asoc->sent_queue_retran_cnt) {
9462                 /*-
9463                  * Ok, it is retransmission time only, we send out only ONE
9464                  * packet with a single call off to the retran code.
9465                  */
9466                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9467                         /*-
9468                          * Special hook for handling cookiess discarded
9469                          * by peer that carried data. Send cookie-ack only
9470                          * and then the next call with get the retran's.
9471                          */
9472                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9473                             from_where,
9474                             &now, &now_filled, frag_point, so_locked);
9475                         return;
9476                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9477                         /* if its not from a HB then do it */
9478                         fr_done = 0;
9479                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9480                         if (fr_done) {
9481                                 tot_frs++;
9482                         }
9483                 } else {
9484                         /*
9485                          * its from any other place, we don't allow retran
9486                          * output (only control)
9487                          */
9488                         ret = 1;
9489                 }
9490                 if (ret > 0) {
9491                         /* Can't send anymore */
9492                         /*-
9493                          * now lets push out control by calling med-level
9494                          * output once. this assures that we WILL send HB's
9495                          * if queued too.
9496                          */
9497                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9498                             from_where,
9499                             &now, &now_filled, frag_point, so_locked);
9500 #ifdef SCTP_AUDITING_ENABLED
9501                         sctp_auditing(8, inp, stcb, NULL);
9502 #endif
9503                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9504                         return;
9505                 }
9506                 if (ret < 0) {
9507                         /*-
9508                          * The count was off.. retran is not happening so do
9509                          * the normal retransmission.
9510                          */
9511 #ifdef SCTP_AUDITING_ENABLED
9512                         sctp_auditing(9, inp, stcb, NULL);
9513 #endif
9514                         if (ret == SCTP_RETRAN_EXIT) {
9515                                 return;
9516                         }
9517                         break;
9518                 }
9519                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9520                         /* Only one transmission allowed out of a timeout */
9521 #ifdef SCTP_AUDITING_ENABLED
9522                         sctp_auditing(10, inp, stcb, NULL);
9523 #endif
9524                         /* Push out any control */
9525                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9526                             &now, &now_filled, frag_point, so_locked);
9527                         return;
9528                 }
9529                 if (tot_frs > asoc->max_burst) {
9530                         /* Hit FR burst limit */
9531                         return;
9532                 }
9533                 if ((num_out == 0) && (ret == 0)) {
9534
9535                         /* No more retrans to send */
9536                         break;
9537                 }
9538         }
9539 #ifdef SCTP_AUDITING_ENABLED
9540         sctp_auditing(12, inp, stcb, NULL);
9541 #endif
9542         /* Check for bad destinations, if they exist move chunks around. */
9543         burst_limit = asoc->max_burst;
9544         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9545                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9546                     SCTP_ADDR_NOT_REACHABLE) {
9547                         /*-
9548                          * if possible move things off of this address we
9549                          * still may send below due to the dormant state but
9550                          * we try to find an alternate address to send to
9551                          * and if we have one we move all queued data on the
9552                          * out wheel to this alternate address.
9553                          */
9554                         if (net->ref_count > 1)
9555                                 sctp_move_to_an_alt(stcb, asoc, net);
9556                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9557                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9558                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9559                         /*
9560                          * JRS 5/14/07 - If CMT PF is on and the current
9561                          * destination is in PF state, move all queued data
9562                          * to an alternate desination.
9563                          */
9564                         if (net->ref_count > 1)
9565                                 sctp_move_to_an_alt(stcb, asoc, net);
9566                 } else {
9567                         /*-
9568                          * if ((asoc->sat_network) || (net->addr_is_local))
9569                          * { burst_limit = asoc->max_burst *
9570                          * SCTP_SAT_NETWORK_BURST_INCR; }
9571                          */
9572                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9573                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9574                                         /*
9575                                          * JRS - Use the congestion control
9576                                          * given in the congestion control
9577                                          * module
9578                                          */
9579                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9580                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9581                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9582                                         }
9583                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9584                                 }
9585                                 net->fast_retran_ip = 0;
9586                         } else {
9587                                 if (net->flight_size == 0) {
9588                                         /* Should be decaying the cwnd here */
9589                                         ;
9590                                 }
9591                         }
9592                 }
9593
9594         }
9595         burst_cnt = 0;
9596         do {
9597                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9598                     &reason_code, 0, from_where,
9599                     &now, &now_filled, frag_point, so_locked);
9600                 if (error) {
9601                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9602                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9603                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9604                         }
9605                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9606                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9607                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9608                         }
9609                         break;
9610                 }
9611                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9612
9613                 tot_out += num_out;
9614                 burst_cnt++;
9615                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9616                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9617                         if (num_out == 0) {
9618                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9619                         }
9620                 }
9621                 if (nagle_on) {
9622                         /*-
9623                          * When nagle is on, we look at how much is un_sent, then
9624                          * if its smaller than an MTU and we have data in
9625                          * flight we stop.
9626                          */
9627                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9628                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9629                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9630                             (stcb->asoc.total_flight > 0)) {
9631                                 break;
9632                         }
9633                 }
9634                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9635                     TAILQ_EMPTY(&asoc->send_queue) &&
9636                     TAILQ_EMPTY(&asoc->out_wheel)) {
9637                         /* Nothing left to send */
9638                         break;
9639                 }
9640                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9641                         /* Nothing left to send */
9642                         break;
9643                 }
9644         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9645             (burst_cnt < burst_limit)));
9646
9647         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9648                 if (burst_cnt >= burst_limit) {
9649                         SCTP_STAT_INCR(sctps_maxburstqueued);
9650                         asoc->burst_limit_applied = 1;
9651                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9652                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9653                         }
9654                 } else {
9655                         asoc->burst_limit_applied = 0;
9656                 }
9657         }
9658         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9659                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9660         }
9661         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9662             tot_out);
9663
9664         /*-
9665          * Now we need to clean up the control chunk chain if a ECNE is on
9666          * it. It must be marked as UNSENT again so next call will continue
9667          * to send it until such time that we get a CWR, to remove it.
9668          */
9669         if (stcb->asoc.ecn_echo_cnt_onq)
9670                 sctp_fix_ecn_echo(asoc);
9671         return;
9672 }
9673
9674
9675 int
9676 sctp_output(inp, m, addr, control, p, flags)
9677         struct sctp_inpcb *inp;
9678         struct mbuf *m;
9679         struct sockaddr *addr;
9680         struct mbuf *control;
9681         struct thread *p;
9682         int flags;
9683 {
9684         if (inp == NULL) {
9685                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9686                 return (EINVAL);
9687         }
9688         if (inp->sctp_socket == NULL) {
9689                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9690                 return (EINVAL);
9691         }
9692         return (sctp_sosend(inp->sctp_socket,
9693             addr,
9694             (struct uio *)NULL,
9695             m,
9696             control,
9697             flags, p
9698             ));
9699 }
9700
9701 void
9702 send_forward_tsn(struct sctp_tcb *stcb,
9703     struct sctp_association *asoc)
9704 {
9705         struct sctp_tmit_chunk *chk;
9706         struct sctp_forward_tsn_chunk *fwdtsn;
9707         uint32_t advance_peer_ack_point;
9708
9709         SCTP_TCB_LOCK_ASSERT(stcb);
9710         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9711                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9712                         /* mark it to unsent */
9713                         chk->sent = SCTP_DATAGRAM_UNSENT;
9714                         chk->snd_count = 0;
9715                         /* Do we correct its output location? */
9716                         if (chk->whoTo != asoc->primary_destination) {
9717                                 sctp_free_remote_addr(chk->whoTo);
9718                                 chk->whoTo = asoc->primary_destination;
9719                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9720                         }
9721                         goto sctp_fill_in_rest;
9722                 }
9723         }
9724         /* Ok if we reach here we must build one */
9725         sctp_alloc_a_chunk(stcb, chk);
9726         if (chk == NULL) {
9727                 return;
9728         }
9729         chk->copy_by_ref = 0;
9730         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9731         chk->rec.chunk_id.can_take_data = 0;
9732         chk->asoc = asoc;
9733         chk->whoTo = NULL;
9734
9735         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9736         if (chk->data == NULL) {
9737                 sctp_free_a_chunk(stcb, chk);
9738                 return;
9739         }
9740         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9741         chk->sent = SCTP_DATAGRAM_UNSENT;
9742         chk->snd_count = 0;
9743         chk->whoTo = asoc->primary_destination;
9744         atomic_add_int(&chk->whoTo->ref_count, 1);
9745         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9746         asoc->ctrl_queue_cnt++;
9747 sctp_fill_in_rest:
9748         /*-
9749          * Here we go through and fill out the part that deals with
9750          * stream/seq of the ones we skip.
9751          */
9752         SCTP_BUF_LEN(chk->data) = 0;
9753         {
9754                 struct sctp_tmit_chunk *at, *tp1, *last;
9755                 struct sctp_strseq *strseq;
9756                 unsigned int cnt_of_space, i, ovh;
9757                 unsigned int space_needed;
9758                 unsigned int cnt_of_skipped = 0;
9759
9760                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9761                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9762                                 /* no more to look at */
9763                                 break;
9764                         }
9765                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9766                                 /* We don't report these */
9767                                 continue;
9768                         }
9769                         cnt_of_skipped++;
9770                 }
9771                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9772                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9773
9774                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9775
9776                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9777                         ovh = SCTP_MIN_OVERHEAD;
9778                 } else {
9779                         ovh = SCTP_MIN_V4_OVERHEAD;
9780                 }
9781                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9782                         /* trim to a mtu size */
9783                         cnt_of_space = asoc->smallest_mtu - ovh;
9784                 }
9785                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9786                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9787                             0xff, 0, cnt_of_skipped,
9788                             asoc->advanced_peer_ack_point);
9789
9790                 }
9791                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9792                 if (cnt_of_space < space_needed) {
9793                         /*-
9794                          * ok we must trim down the chunk by lowering the
9795                          * advance peer ack point.
9796                          */
9797                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9798                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9799                                     0xff, 0xff, cnt_of_space,
9800                                     space_needed);
9801                         }
9802                         cnt_of_skipped = (cnt_of_space -
9803                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9804                             sizeof(struct sctp_strseq)));
9805                         /*-
9806                          * Go through and find the TSN that will be the one
9807                          * we report.
9808                          */
9809                         at = TAILQ_FIRST(&asoc->sent_queue);
9810                         for (i = 0; i < cnt_of_skipped; i++) {
9811                                 tp1 = TAILQ_NEXT(at, sctp_next);
9812                                 at = tp1;
9813                         }
9814                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9815                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9816                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9817                                     asoc->advanced_peer_ack_point);
9818                         }
9819                         last = at;
9820                         /*-
9821                          * last now points to last one I can report, update
9822                          * peer ack point
9823                          */
9824                         advance_peer_ack_point = last->rec.data.TSN_seq;
9825                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9826                 }
9827                 chk->send_size = space_needed;
9828                 /* Setup the chunk */
9829                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9830                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9831                 fwdtsn->ch.chunk_flags = 0;
9832                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9833                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9834                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9835                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9836                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9837                 fwdtsn++;
9838                 /*-
9839                  * Move pointer to after the fwdtsn and transfer to the
9840                  * strseq pointer.
9841                  */
9842                 strseq = (struct sctp_strseq *)fwdtsn;
9843                 /*-
9844                  * Now populate the strseq list. This is done blindly
9845                  * without pulling out duplicate stream info. This is
9846                  * inefficent but won't harm the process since the peer will
9847                  * look at these in sequence and will thus release anything.
9848                  * It could mean we exceed the PMTU and chop off some that
9849                  * we could have included.. but this is unlikely (aka 1432/4
9850                  * would mean 300+ stream seq's would have to be reported in
9851                  * one FWD-TSN. With a bit of work we can later FIX this to
9852                  * optimize and pull out duplcates.. but it does add more
9853                  * overhead. So for now... not!
9854                  */
9855                 at = TAILQ_FIRST(&asoc->sent_queue);
9856                 for (i = 0; i < cnt_of_skipped; i++) {
9857                         tp1 = TAILQ_NEXT(at, sctp_next);
9858                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9859                                 /* We don't report these */
9860                                 i--;
9861                                 at = tp1;
9862                                 continue;
9863                         }
9864                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9865                                 at->rec.data.fwd_tsn_cnt = 0;
9866                         }
9867                         strseq->stream = ntohs(at->rec.data.stream_number);
9868                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9869                         strseq++;
9870                         at = tp1;
9871                 }
9872         }
9873         return;
9874
9875 }
9876
9877 void
9878 sctp_send_sack(struct sctp_tcb *stcb)
9879 {
9880         /*-
9881          * Queue up a SACK in the control queue. We must first check to see
9882          * if a SACK is somehow on the control queue. If so, we will take
9883          * and and remove the old one.
9884          */
9885         struct sctp_association *asoc;
9886         struct sctp_tmit_chunk *chk, *a_chk;
9887         struct sctp_sack_chunk *sack;
9888         struct sctp_gap_ack_block *gap_descriptor;
9889         struct sack_track *selector;
9890         int mergeable = 0;
9891         int offset;
9892         caddr_t limit;
9893         uint32_t *dup;
9894         int limit_reached = 0;
9895         unsigned int i, jstart, siz, j;
9896         unsigned int num_gap_blocks = 0, space;
9897         int num_dups = 0;
9898         int space_req;
9899
9900         a_chk = NULL;
9901         asoc = &stcb->asoc;
9902         SCTP_TCB_LOCK_ASSERT(stcb);
9903         if (asoc->last_data_chunk_from == NULL) {
9904                 /* Hmm we never received anything */
9905                 return;
9906         }
9907         sctp_set_rwnd(stcb, asoc);
9908         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9909                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9910                         /* Hmm, found a sack already on queue, remove it */
9911                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9912                         asoc->ctrl_queue_cnt++;
9913                         a_chk = chk;
9914                         if (a_chk->data) {
9915                                 sctp_m_freem(a_chk->data);
9916                                 a_chk->data = NULL;
9917                         }
9918                         sctp_free_remote_addr(a_chk->whoTo);
9919                         a_chk->whoTo = NULL;
9920                         break;
9921                 }
9922         }
9923         if (a_chk == NULL) {
9924                 sctp_alloc_a_chunk(stcb, a_chk);
9925                 if (a_chk == NULL) {
9926                         /* No memory so we drop the idea, and set a timer */
9927                         if (stcb->asoc.delayed_ack) {
9928                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9929                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9930                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9931                                     stcb->sctp_ep, stcb, NULL);
9932                         } else {
9933                                 stcb->asoc.send_sack = 1;
9934                         }
9935                         return;
9936                 }
9937                 a_chk->copy_by_ref = 0;
9938                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9939                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9940                 a_chk->rec.chunk_id.can_take_data = 1;
9941         }
9942         /* Clear our pkt counts */
9943         asoc->data_pkts_seen = 0;
9944
9945         a_chk->asoc = asoc;
9946         a_chk->snd_count = 0;
9947         a_chk->send_size = 0;   /* fill in later */
9948         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9949         a_chk->whoTo = NULL;
9950
9951         if ((asoc->numduptsns) ||
9952             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9953             ) {
9954                 /*-
9955                  * Ok, we have some duplicates or the destination for the
9956                  * sack is unreachable, lets see if we can select an
9957                  * alternate than asoc->last_data_chunk_from
9958                  */
9959                 if ((!(asoc->last_data_chunk_from->dest_state &
9960                     SCTP_ADDR_NOT_REACHABLE)) &&
9961                     (asoc->used_alt_onsack > asoc->numnets)) {
9962                         /* We used an alt last time, don't this time */
9963                         a_chk->whoTo = NULL;
9964                 } else {
9965                         asoc->used_alt_onsack++;
9966                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9967                 }
9968                 if (a_chk->whoTo == NULL) {
9969                         /* Nope, no alternate */
9970                         a_chk->whoTo = asoc->last_data_chunk_from;
9971                         asoc->used_alt_onsack = 0;
9972                 }
9973         } else {
9974                 /*
9975                  * No duplicates so we use the last place we received data
9976                  * from.
9977                  */
9978                 asoc->used_alt_onsack = 0;
9979                 a_chk->whoTo = asoc->last_data_chunk_from;
9980         }
9981         if (a_chk->whoTo) {
9982                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9983         }
9984         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9985                 /* no gaps */
9986                 space_req = sizeof(struct sctp_sack_chunk);
9987         } else {
9988                 /* gaps get a cluster */
9989                 space_req = MCLBYTES;
9990         }
9991         /* Ok now lets formulate a MBUF with our sack */
9992         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9993         if ((a_chk->data == NULL) ||
9994             (a_chk->whoTo == NULL)) {
9995                 /* rats, no mbuf memory */
9996                 if (a_chk->data) {
9997                         /* was a problem with the destination */
9998                         sctp_m_freem(a_chk->data);
9999                         a_chk->data = NULL;
10000                 }
10001                 sctp_free_a_chunk(stcb, a_chk);
10002                 /* sa_ignore NO_NULL_CHK */
10003                 if (stcb->asoc.delayed_ack) {
10004                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10005                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10006                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10007                             stcb->sctp_ep, stcb, NULL);
10008                 } else {
10009                         stcb->asoc.send_sack = 1;
10010                 }
10011                 return;
10012         }
10013         /* ok, lets go through and fill it in */
10014         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10015         space = M_TRAILINGSPACE(a_chk->data);
10016         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10017                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10018         }
10019         limit = mtod(a_chk->data, caddr_t);
10020         limit += space;
10021
10022         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10023         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
10024         /* 0x01 is used by nonce for ecn */
10025         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10026             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10027             (asoc->peer_supports_ecn_nonce))
10028                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10029         else
10030                 sack->ch.chunk_flags = 0;
10031
10032         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10033                 /*-
10034                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10035                  * received, then set high bit to 1, else 0. Reset
10036                  * pkts_rcvd.
10037                  */
10038                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10039                 asoc->cmt_dac_pkts_rcvd = 0;
10040         }
10041 #ifdef SCTP_ASOCLOG_OF_TSNS
10042         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10043         stcb->asoc.cumack_log_atsnt++;
10044         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10045                 stcb->asoc.cumack_log_atsnt = 0;
10046         }
10047 #endif
10048         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10049         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10050         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10051
10052         /* reset the readers interpretation */
10053         stcb->freed_by_sorcv_sincelast = 0;
10054
10055         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10056
10057         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10058                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10059         else
10060                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10061
10062         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10063                 offset = 1;
10064                 /*-
10065                  * cum-ack behind the mapping array, so we start and use all
10066                  * entries.
10067                  */
10068                 jstart = 0;
10069         } else {
10070                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10071                 /*-
10072                  * we skip the first one when the cum-ack is at or above the
10073                  * mapping array base. Note this only works if
10074                  */
10075                 jstart = 1;
10076         }
10077         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10078                 /* we have a gap .. maybe */
10079                 for (i = 0; i < siz; i++) {
10080                         selector = &sack_array[asoc->mapping_array[i]];
10081                         if (mergeable && selector->right_edge) {
10082                                 /*
10083                                  * Backup, left and right edges were ok to
10084                                  * merge.
10085                                  */
10086                                 num_gap_blocks--;
10087                                 gap_descriptor--;
10088                         }
10089                         if (selector->num_entries == 0)
10090                                 mergeable = 0;
10091                         else {
10092                                 for (j = jstart; j < selector->num_entries; j++) {
10093                                         if (mergeable && selector->right_edge) {
10094                                                 /*
10095                                                  * do a merge by NOT setting
10096                                                  * the left side
10097                                                  */
10098                                                 mergeable = 0;
10099                                         } else {
10100                                                 /*
10101                                                  * no merge, set the left
10102                                                  * side
10103                                                  */
10104                                                 mergeable = 0;
10105                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10106                                         }
10107                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10108                                         num_gap_blocks++;
10109                                         gap_descriptor++;
10110                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10111                                                 /* no more room */
10112                                                 limit_reached = 1;
10113                                                 break;
10114                                         }
10115                                 }
10116                                 if (selector->left_edge) {
10117                                         mergeable = 1;
10118                                 }
10119                         }
10120                         if (limit_reached) {
10121                                 /* Reached the limit stop */
10122                                 break;
10123                         }
10124                         jstart = 0;
10125                         offset += 8;
10126                 }
10127                 if (num_gap_blocks == 0) {
10128                         /*
10129                          * slide not yet happened, and somehow we got called
10130                          * to send a sack. Cumack needs to move up.
10131                          */
10132                         int abort_flag = 0;
10133
10134                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10135                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10136                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10137                 }
10138         }
10139         /* now we must add any dups we are going to report. */
10140         if ((limit_reached == 0) && (asoc->numduptsns)) {
10141                 dup = (uint32_t *) gap_descriptor;
10142                 for (i = 0; i < asoc->numduptsns; i++) {
10143                         *dup = htonl(asoc->dup_tsns[i]);
10144                         dup++;
10145                         num_dups++;
10146                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10147                                 /* no more room */
10148                                 break;
10149                         }
10150                 }
10151                 asoc->numduptsns = 0;
10152         }
10153         /*
10154          * now that the chunk is prepared queue it to the control chunk
10155          * queue.
10156          */
10157         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10158             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10159             (num_dups * sizeof(int32_t)));
10160         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10161         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10162         sack->sack.num_dup_tsns = htons(num_dups);
10163         sack->ch.chunk_length = htons(a_chk->send_size);
10164         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10165         asoc->ctrl_queue_cnt++;
10166         asoc->send_sack = 0;
10167         SCTP_STAT_INCR(sctps_sendsacks);
10168         return;
10169 }
10170
10171 /* EY - This method will replace sctp_send_sack method if nr_sacks negotiated*/
10172 void
10173 sctp_send_nr_sack(struct sctp_tcb *stcb)
10174 {
10175         /*-
10176          * Queue up an NR-SACK in the control queue. We must first check to see
10177          * if an NR-SACK is somehow on the control queue. If so, we will take
10178          * and and remove the old one.
10179          */
10180         struct sctp_association *asoc;
10181         struct sctp_tmit_chunk *chk, *a_chk;
10182
10183         struct sctp_nr_sack_chunk *nr_sack;
10184
10185         struct sctp_gap_ack_block *gap_descriptor;
10186         struct sctp_nr_gap_ack_block *nr_gap_descriptor;
10187
10188         struct sack_track *selector;
10189         struct sack_track *nr_selector;
10190
10191         /* EY do we need nr_mergeable, NO */
10192         int mergeable = 0;
10193         int offset;
10194         caddr_t limit;
10195         uint32_t *dup;
10196         int limit_reached = 0;
10197         unsigned int i, jstart, siz, j;
10198         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10199         int num_dups = 0;
10200         int space_req;
10201         unsigned int reserved = 0;
10202
10203         a_chk = NULL;
10204         asoc = &stcb->asoc;
10205         SCTP_TCB_LOCK_ASSERT(stcb);
10206         if (asoc->last_data_chunk_from == NULL) {
10207                 /* Hmm we never received anything */
10208                 return;
10209         }
10210         sctp_set_rwnd(stcb, asoc);
10211         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10212                 if (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) {
10213                         /* Hmm, found a sack already on queue, remove it */
10214                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10215                         asoc->ctrl_queue_cnt++;
10216                         a_chk = chk;
10217                         if (a_chk->data) {
10218                                 sctp_m_freem(a_chk->data);
10219                                 a_chk->data = NULL;
10220                         }
10221                         sctp_free_remote_addr(a_chk->whoTo);
10222                         a_chk->whoTo = NULL;
10223                         break;
10224                 }
10225         }
10226         if (a_chk == NULL) {
10227                 sctp_alloc_a_chunk(stcb, a_chk);
10228                 if (a_chk == NULL) {
10229                         /* No memory so we drop the idea, and set a timer */
10230                         if (stcb->asoc.delayed_ack) {
10231                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10232                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10233                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10234                                     stcb->sctp_ep, stcb, NULL);
10235                         } else {
10236                                 stcb->asoc.send_sack = 1;
10237                         }
10238                         return;
10239                 }
10240                 a_chk->copy_by_ref = 0;
10241                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
10242                 a_chk->rec.chunk_id.id = SCTP_NR_SELECTIVE_ACK;
10243                 a_chk->rec.chunk_id.can_take_data = 1;
10244         }
10245         /* Clear our pkt counts */
10246         asoc->data_pkts_seen = 0;
10247
10248         a_chk->asoc = asoc;
10249         a_chk->snd_count = 0;
10250         a_chk->send_size = 0;   /* fill in later */
10251         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10252         a_chk->whoTo = NULL;
10253
10254         if ((asoc->numduptsns) ||
10255             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
10256             ) {
10257                 /*-
10258                  * Ok, we have some duplicates or the destination for the
10259                  * sack is unreachable, lets see if we can select an
10260                  * alternate than asoc->last_data_chunk_from
10261                  */
10262                 if ((!(asoc->last_data_chunk_from->dest_state &
10263                     SCTP_ADDR_NOT_REACHABLE)) &&
10264                     (asoc->used_alt_onsack > asoc->numnets)) {
10265                         /* We used an alt last time, don't this time */
10266                         a_chk->whoTo = NULL;
10267                 } else {
10268                         asoc->used_alt_onsack++;
10269                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10270                 }
10271                 if (a_chk->whoTo == NULL) {
10272                         /* Nope, no alternate */
10273                         a_chk->whoTo = asoc->last_data_chunk_from;
10274                         asoc->used_alt_onsack = 0;
10275                 }
10276         } else {
10277                 /*
10278                  * No duplicates so we use the last place we received data
10279                  * from.
10280                  */
10281                 asoc->used_alt_onsack = 0;
10282                 a_chk->whoTo = asoc->last_data_chunk_from;
10283         }
10284         if (a_chk->whoTo) {
10285                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10286         }
10287         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10288                 /* no gaps */
10289                 space_req = sizeof(struct sctp_nr_sack_chunk);
10290         } else {
10291                 /* EY - what is this about? */
10292                 /* gaps get a cluster */
10293                 space_req = MCLBYTES;
10294         }
10295         /* Ok now lets formulate a MBUF with our sack */
10296         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10297         if ((a_chk->data == NULL) ||
10298             (a_chk->whoTo == NULL)) {
10299                 /* rats, no mbuf memory */
10300                 if (a_chk->data) {
10301                         /* was a problem with the destination */
10302                         sctp_m_freem(a_chk->data);
10303                         a_chk->data = NULL;
10304                 }
10305                 sctp_free_a_chunk(stcb, a_chk);
10306                 /* sa_ignore NO_NULL_CHK */
10307                 if (stcb->asoc.delayed_ack) {
10308                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10309                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10310                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10311                             stcb->sctp_ep, stcb, NULL);
10312                 } else {
10313                         stcb->asoc.send_sack = 1;
10314                 }
10315                 return;
10316         }
10317         /* ok, lets go through and fill it in */
10318         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10319         space = M_TRAILINGSPACE(a_chk->data);
10320         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10321                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10322         }
10323         limit = mtod(a_chk->data, caddr_t);
10324         limit += space;
10325
10326         nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10327         nr_sack->ch.chunk_type = SCTP_NR_SELECTIVE_ACK;
10328         /* EYJ */
10329         /* 0x01 is used by nonce for ecn */
10330         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10331             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10332             (asoc->peer_supports_ecn_nonce))
10333                 nr_sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10334         else
10335                 nr_sack->ch.chunk_flags = 0;
10336
10337         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10338                 /*-
10339                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10340                  * received, then set high bit to 1, else 0. Reset
10341                  * pkts_rcvd.
10342                  */
10343                 /* EY - TODO: which chunk flag is used in here? -The LSB */
10344                 nr_sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10345                 asoc->cmt_dac_pkts_rcvd = 0;
10346         }
10347 #ifdef SCTP_ASOCLOG_OF_TSNS
10348         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10349         stcb->asoc.cumack_log_atsnt++;
10350         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10351                 stcb->asoc.cumack_log_atsnt = 0;
10352         }
10353 #endif
10354         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10355         nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10356         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10357
10358         /* reset the readers interpretation */
10359         stcb->freed_by_sorcv_sincelast = 0;
10360
10361         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10362
10363         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10364                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10365         else
10366                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10367
10368         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10369                 offset = 1;
10370                 /*-
10371                  * cum-ack behind the mapping array, so we start and use all
10372                  * entries.
10373                  */
10374                 jstart = 0;
10375         } else {
10376                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10377                 /*-
10378                  * we skip the first one when the cum-ack is at or above the
10379                  * mapping array base. Note this only works if
10380                  */
10381                 jstart = 1;
10382         }
10383         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10384                 /* we have a gap .. maybe */
10385                 for (i = 0; i < siz; i++) {
10386                         selector = &sack_array[asoc->mapping_array[i]];
10387                         if (mergeable && selector->right_edge) {
10388                                 /*
10389                                  * Backup, left and right edges were ok to
10390                                  * merge.
10391                                  */
10392                                 num_gap_blocks--;
10393                                 gap_descriptor--;
10394                         }
10395                         if (selector->num_entries == 0)
10396                                 mergeable = 0;
10397                         else {
10398                                 for (j = jstart; j < selector->num_entries; j++) {
10399                                         if (mergeable && selector->right_edge) {
10400                                                 /*
10401                                                  * do a merge by NOT setting
10402                                                  * the left side
10403                                                  */
10404                                                 mergeable = 0;
10405                                         } else {
10406                                                 /*
10407                                                  * no merge, set the left
10408                                                  * side
10409                                                  */
10410                                                 mergeable = 0;
10411                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10412                                         }
10413                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10414                                         num_gap_blocks++;
10415                                         gap_descriptor++;
10416                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10417                                                 /* no more room */
10418                                                 limit_reached = 1;
10419                                                 break;
10420                                         }
10421                                 }
10422                                 if (selector->left_edge) {
10423                                         mergeable = 1;
10424                                 }
10425                         }
10426                         if (limit_reached) {
10427                                 /* Reached the limit stop */
10428                                 break;
10429                         }
10430                         jstart = 0;
10431                         offset += 8;
10432                 }
10433                 if (num_gap_blocks == 0) {
10434                         /*
10435                          * slide not yet happened, and somehow we got called
10436                          * to send a sack. Cumack needs to move up.
10437                          */
10438                         int abort_flag = 0;
10439
10440                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10441                         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10442                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10443                 }
10444         }
10445         /*---------------------------------------------------------filling the nr_gap_ack blocks----------------------------------------------------*/
10446
10447         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)gap_descriptor;
10448
10449         /* EY - there will be gaps + nr_gaps if draining is possible */
10450         if ((SCTP_BASE_SYSCTL(sctp_do_drain)) && (limit_reached == 0)) {
10451
10452                 mergeable = 0;
10453
10454                 if (asoc->highest_tsn_inside_nr_map > asoc->nr_mapping_array_base_tsn)
10455                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn) + 1) + 7) / 8;
10456                 else
10457                         siz = (((MAX_TSN - asoc->nr_mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10458
10459                 if (compare_with_wrap(asoc->nr_mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10460                         offset = 1;
10461                         /*-
10462                         * cum-ack behind the mapping array, so we start and use all
10463                         * entries.
10464                         */
10465                         jstart = 0;
10466                 } else {
10467                         offset = asoc->nr_mapping_array_base_tsn - asoc->cumulative_tsn;
10468                         /*-
10469                         * we skip the first one when the cum-ack is at or above the
10470                         * mapping array base. Note this only works if
10471                         */
10472                         jstart = 1;
10473                 }
10474                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10475                         /* we have a gap .. maybe */
10476                         for (i = 0; i < siz; i++) {
10477                                 nr_selector = &sack_array[asoc->nr_mapping_array[i]];
10478                                 if (mergeable && nr_selector->right_edge) {
10479                                         /*
10480                                          * Backup, left and right edges were
10481                                          * ok to merge.
10482                                          */
10483                                         num_nr_gap_blocks--;
10484                                         nr_gap_descriptor--;
10485                                 }
10486                                 if (nr_selector->num_entries == 0)
10487                                         mergeable = 0;
10488                                 else {
10489                                         for (j = jstart; j < nr_selector->num_entries; j++) {
10490                                                 if (mergeable && nr_selector->right_edge) {
10491                                                         /*
10492                                                          * do a merge by NOT
10493                                                          * setting the left
10494                                                          * side
10495                                                          */
10496                                                         mergeable = 0;
10497                                                 } else {
10498                                                         /*
10499                                                          * no merge, set the
10500                                                          * left side
10501                                                          */
10502                                                         mergeable = 0;
10503                                                         nr_gap_descriptor->start = htons((nr_selector->gaps[j].start + offset));
10504                                                 }
10505                                                 nr_gap_descriptor->end = htons((nr_selector->gaps[j].end + offset));
10506                                                 num_nr_gap_blocks++;
10507                                                 nr_gap_descriptor++;
10508                                                 if (((caddr_t)nr_gap_descriptor + sizeof(struct sctp_nr_gap_ack_block)) > limit) {
10509                                                         /* no more room */
10510                                                         limit_reached = 1;
10511                                                         break;
10512                                                 }
10513                                         }
10514                                         if (nr_selector->left_edge) {
10515                                                 mergeable = 1;
10516                                         }
10517                                 }
10518                                 if (limit_reached) {
10519                                         /* Reached the limit stop */
10520                                         break;
10521                                 }
10522                                 jstart = 0;
10523                                 offset += 8;
10524                         }
10525                 }
10526         }
10527         /*---------------------------------------------End of---filling the nr_gap_ack blocks----------------------------------------------------*/
10528
10529         /* now we must add any dups we are going to report. */
10530         if ((limit_reached == 0) && (asoc->numduptsns)) {
10531                 dup = (uint32_t *) nr_gap_descriptor;
10532                 for (i = 0; i < asoc->numduptsns; i++) {
10533                         *dup = htonl(asoc->dup_tsns[i]);
10534                         dup++;
10535                         num_dups++;
10536                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10537                                 /* no more room */
10538                                 break;
10539                         }
10540                 }
10541                 asoc->numduptsns = 0;
10542         }
10543         /*
10544          * now that the chunk is prepared queue it to the control chunk
10545          * queue.
10546          */
10547         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
10548                 num_nr_gap_blocks = num_gap_blocks;
10549                 num_gap_blocks = 0;
10550         }
10551         a_chk->send_size = (sizeof(struct sctp_nr_sack_chunk) +
10552             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10553             (num_nr_gap_blocks * sizeof(struct sctp_nr_gap_ack_block)) +
10554             (num_dups * sizeof(int32_t)));
10555
10556         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10557         nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10558         nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10559         nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10560         nr_sack->nr_sack.reserved = htons(reserved);
10561         nr_sack->ch.chunk_length = htons(a_chk->send_size);
10562         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10563         asoc->ctrl_queue_cnt++;
10564         asoc->send_sack = 0;
10565         SCTP_STAT_INCR(sctps_sendsacks);
10566         return;
10567 }
10568
10569 void
10570 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10571 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10572     SCTP_UNUSED
10573 #endif
10574 )
10575 {
10576         struct mbuf *m_abort;
10577         struct mbuf *m_out = NULL, *m_end = NULL;
10578         struct sctp_abort_chunk *abort = NULL;
10579         int sz;
10580         uint32_t auth_offset = 0;
10581         struct sctp_auth_chunk *auth = NULL;
10582
10583         /*-
10584          * Add an AUTH chunk, if chunk requires it and save the offset into
10585          * the chain for AUTH
10586          */
10587         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10588             stcb->asoc.peer_auth_chunks)) {
10589                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10590                     stcb, SCTP_ABORT_ASSOCIATION);
10591                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10592         }
10593         SCTP_TCB_LOCK_ASSERT(stcb);
10594         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10595         if (m_abort == NULL) {
10596                 /* no mbuf's */
10597                 if (m_out)
10598                         sctp_m_freem(m_out);
10599                 return;
10600         }
10601         /* link in any error */
10602         SCTP_BUF_NEXT(m_abort) = operr;
10603         sz = 0;
10604         if (operr) {
10605                 struct mbuf *n;
10606
10607                 n = operr;
10608                 while (n) {
10609                         sz += SCTP_BUF_LEN(n);
10610                         n = SCTP_BUF_NEXT(n);
10611                 }
10612         }
10613         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10614         if (m_out == NULL) {
10615                 /* NO Auth chunk prepended, so reserve space in front */
10616                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10617                 m_out = m_abort;
10618         } else {
10619                 /* Put AUTH chunk at the front of the chain */
10620                 SCTP_BUF_NEXT(m_end) = m_abort;
10621         }
10622
10623         /* fill in the ABORT chunk */
10624         abort = mtod(m_abort, struct sctp_abort_chunk *);
10625         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10626         abort->ch.chunk_flags = 0;
10627         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10628
10629         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10630             stcb->asoc.primary_destination,
10631             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10632             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10633             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10634             stcb->asoc.primary_destination->port, so_locked, NULL);
10635         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10636 }
10637
10638 void
10639 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10640     struct sctp_nets *net)
10641 {
10642         /* formulate and SEND a SHUTDOWN-COMPLETE */
10643         struct mbuf *m_shutdown_comp;
10644         struct sctp_shutdown_complete_chunk *shutdown_complete;
10645
10646         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10647         if (m_shutdown_comp == NULL) {
10648                 /* no mbuf's */
10649                 return;
10650         }
10651         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10652         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10653         shutdown_complete->ch.chunk_flags = 0;
10654         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10655         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10656         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10657             (struct sockaddr *)&net->ro._l_addr,
10658             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10659             stcb->sctp_ep->sctp_lport, stcb->rport,
10660             htonl(stcb->asoc.peer_vtag),
10661             net->port, SCTP_SO_NOT_LOCKED, NULL);
10662         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10663         return;
10664 }
10665
10666 void
10667 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10668     uint32_t vrf_id, uint16_t port)
10669 {
10670         /* formulate and SEND a SHUTDOWN-COMPLETE */
10671         struct mbuf *o_pak;
10672         struct mbuf *mout;
10673         struct ip *iph, *iph_out;
10674         struct udphdr *udp = NULL;
10675
10676 #ifdef INET6
10677         struct ip6_hdr *ip6, *ip6_out;
10678
10679 #endif
10680         int offset_out, len, mlen;
10681         struct sctp_shutdown_complete_msg *comp_cp;
10682
10683         iph = mtod(m, struct ip *);
10684         switch (iph->ip_v) {
10685         case IPVERSION:
10686                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10687                 break;
10688 #ifdef INET6
10689         case IPV6_VERSION >> 4:
10690                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10691                 break;
10692 #endif
10693         default:
10694                 return;
10695         }
10696         if (port) {
10697                 len += sizeof(struct udphdr);
10698         }
10699         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10700         if (mout == NULL) {
10701                 return;
10702         }
10703         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10704         SCTP_BUF_LEN(mout) = len;
10705         SCTP_BUF_NEXT(mout) = NULL;
10706         iph_out = NULL;
10707 #ifdef INET6
10708         ip6_out = NULL;
10709 #endif
10710         offset_out = 0;
10711
10712         switch (iph->ip_v) {
10713         case IPVERSION:
10714                 iph_out = mtod(mout, struct ip *);
10715
10716                 /* Fill in the IP header for the ABORT */
10717                 iph_out->ip_v = IPVERSION;
10718                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10719                 iph_out->ip_tos = (u_char)0;
10720                 iph_out->ip_id = 0;
10721                 iph_out->ip_off = 0;
10722                 iph_out->ip_ttl = MAXTTL;
10723                 if (port) {
10724                         iph_out->ip_p = IPPROTO_UDP;
10725                 } else {
10726                         iph_out->ip_p = IPPROTO_SCTP;
10727                 }
10728                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10729                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10730
10731                 /* let IP layer calculate this */
10732                 iph_out->ip_sum = 0;
10733                 offset_out += sizeof(*iph_out);
10734                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10735                     (caddr_t)iph_out + offset_out);
10736                 break;
10737 #ifdef INET6
10738         case IPV6_VERSION >> 4:
10739                 ip6 = (struct ip6_hdr *)iph;
10740                 ip6_out = mtod(mout, struct ip6_hdr *);
10741
10742                 /* Fill in the IPv6 header for the ABORT */
10743                 ip6_out->ip6_flow = ip6->ip6_flow;
10744                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10745                 if (port) {
10746                         ip6_out->ip6_nxt = IPPROTO_UDP;
10747                 } else {
10748                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10749                 }
10750                 ip6_out->ip6_src = ip6->ip6_dst;
10751                 ip6_out->ip6_dst = ip6->ip6_src;
10752                 /*
10753                  * ?? The old code had both the iph len + payload, I think
10754                  * this is wrong and would never have worked
10755                  */
10756                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10757                 offset_out += sizeof(*ip6_out);
10758                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10759                     (caddr_t)ip6_out + offset_out);
10760                 break;
10761 #endif                          /* INET6 */
10762         default:
10763                 /* Currently not supported. */
10764                 sctp_m_freem(mout);
10765                 return;
10766         }
10767         if (port) {
10768                 udp = (struct udphdr *)comp_cp;
10769                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10770                 udp->uh_dport = port;
10771                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10772                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10773                 offset_out += sizeof(struct udphdr);
10774                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10775         }
10776         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10777                 /* no mbuf's */
10778                 sctp_m_freem(mout);
10779                 return;
10780         }
10781         /* Now copy in and fill in the ABORT tags etc. */
10782         comp_cp->sh.src_port = sh->dest_port;
10783         comp_cp->sh.dest_port = sh->src_port;
10784         comp_cp->sh.checksum = 0;
10785         comp_cp->sh.v_tag = sh->v_tag;
10786         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10787         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10788         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10789
10790         if (iph_out != NULL) {
10791                 sctp_route_t ro;
10792                 int ret;
10793                 struct sctp_tcb *stcb = NULL;
10794
10795                 mlen = SCTP_BUF_LEN(mout);
10796                 bzero(&ro, sizeof ro);
10797                 /* set IPv4 length */
10798                 iph_out->ip_len = mlen;
10799 #ifdef  SCTP_PACKET_LOGGING
10800                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10801                         sctp_packet_log(mout, mlen);
10802 #endif
10803                 if (port) {
10804                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10805                         SCTP_STAT_INCR(sctps_sendswcrc);
10806                         SCTP_ENABLE_UDP_CSUM(mout);
10807                 } else {
10808                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10809                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
10810                         SCTP_STAT_INCR(sctps_sendhwcrc);
10811                 }
10812                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10813                 /* out it goes */
10814                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10815
10816                 /* Free the route if we got one back */
10817                 if (ro.ro_rt)
10818                         RTFREE(ro.ro_rt);
10819         }
10820 #ifdef INET6
10821         if (ip6_out != NULL) {
10822                 struct route_in6 ro;
10823                 int ret;
10824                 struct sctp_tcb *stcb = NULL;
10825                 struct ifnet *ifp = NULL;
10826
10827                 bzero(&ro, sizeof(ro));
10828                 mlen = SCTP_BUF_LEN(mout);
10829 #ifdef  SCTP_PACKET_LOGGING
10830                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10831                         sctp_packet_log(mout, mlen);
10832 #endif
10833                 comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10834                 SCTP_STAT_INCR(sctps_sendswcrc);
10835                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10836                 if (port) {
10837                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10838                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10839                                 udp->uh_sum = 0xffff;
10840                         }
10841                 }
10842                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10843
10844                 /* Free the route if we got one back */
10845                 if (ro.ro_rt)
10846                         RTFREE(ro.ro_rt);
10847         }
10848 #endif
10849         SCTP_STAT_INCR(sctps_sendpackets);
10850         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10851         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10852         return;
10853
10854 }
10855
10856 static struct sctp_nets *
10857 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10858 {
10859         struct sctp_nets *net, *hnet;
10860         int ms_goneby, highest_ms, state_overide = 0;
10861
10862         (void)SCTP_GETTIME_TIMEVAL(now);
10863         highest_ms = 0;
10864         hnet = NULL;
10865         SCTP_TCB_LOCK_ASSERT(stcb);
10866         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10867                 if (
10868                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10869                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10870                     ) {
10871                         /*
10872                          * Skip this guy from consideration if HB is off AND
10873                          * its confirmed
10874                          */
10875                         continue;
10876                 }
10877                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10878                         /* skip this dest net from consideration */
10879                         continue;
10880                 }
10881                 if (net->last_sent_time.tv_sec) {
10882                         /* Sent to so we subtract */
10883                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10884                 } else
10885                         /* Never been sent to */
10886                         ms_goneby = 0x7fffffff;
10887                 /*-
10888                  * When the address state is unconfirmed but still
10889                  * considered reachable, we HB at a higher rate. Once it
10890                  * goes confirmed OR reaches the "unreachable" state, thenw
10891                  * we cut it back to HB at a more normal pace.
10892                  */
10893                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10894                         state_overide = 1;
10895                 } else {
10896                         state_overide = 0;
10897                 }
10898
10899                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10900                     (ms_goneby > highest_ms)) {
10901                         highest_ms = ms_goneby;
10902                         hnet = net;
10903                 }
10904         }
10905         if (hnet &&
10906             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10907                 state_overide = 1;
10908         } else {
10909                 state_overide = 0;
10910         }
10911
10912         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10913                 /*-
10914                  * Found the one with longest delay bounds OR it is
10915                  * unconfirmed and still not marked unreachable.
10916                  */
10917                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10918 #ifdef SCTP_DEBUG
10919                 if (hnet) {
10920                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10921                             (struct sockaddr *)&hnet->ro._l_addr);
10922                 } else {
10923                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10924                 }
10925 #endif
10926                 /* update the timer now */
10927                 hnet->last_sent_time = *now;
10928                 return (hnet);
10929         }
10930         /* Nothing to HB */
10931         return (NULL);
10932 }
10933
10934 int
10935 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10936 {
10937         struct sctp_tmit_chunk *chk;
10938         struct sctp_nets *net;
10939         struct sctp_heartbeat_chunk *hb;
10940         struct timeval now;
10941         struct sockaddr_in *sin;
10942         struct sockaddr_in6 *sin6;
10943
10944         SCTP_TCB_LOCK_ASSERT(stcb);
10945         if (user_req == 0) {
10946                 net = sctp_select_hb_destination(stcb, &now);
10947                 if (net == NULL) {
10948                         /*-
10949                          * All our busy none to send to, just start the
10950                          * timer again.
10951                          */
10952                         if (stcb->asoc.state == 0) {
10953                                 return (0);
10954                         }
10955                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10956                             stcb->sctp_ep,
10957                             stcb,
10958                             net);
10959                         return (0);
10960                 }
10961         } else {
10962                 net = u_net;
10963                 if (net == NULL) {
10964                         return (0);
10965                 }
10966                 (void)SCTP_GETTIME_TIMEVAL(&now);
10967         }
10968         sin = (struct sockaddr_in *)&net->ro._l_addr;
10969         if (sin->sin_family != AF_INET) {
10970                 if (sin->sin_family != AF_INET6) {
10971                         /* huh */
10972                         return (0);
10973                 }
10974         }
10975         sctp_alloc_a_chunk(stcb, chk);
10976         if (chk == NULL) {
10977                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10978                 return (0);
10979         }
10980         chk->copy_by_ref = 0;
10981         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10982         chk->rec.chunk_id.can_take_data = 1;
10983         chk->asoc = &stcb->asoc;
10984         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10985
10986         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10987         if (chk->data == NULL) {
10988                 sctp_free_a_chunk(stcb, chk);
10989                 return (0);
10990         }
10991         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10992         SCTP_BUF_LEN(chk->data) = chk->send_size;
10993         chk->sent = SCTP_DATAGRAM_UNSENT;
10994         chk->snd_count = 0;
10995         chk->whoTo = net;
10996         atomic_add_int(&chk->whoTo->ref_count, 1);
10997         /* Now we have a mbuf that we can fill in with the details */
10998         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10999         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11000         /* fill out chunk header */
11001         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11002         hb->ch.chunk_flags = 0;
11003         hb->ch.chunk_length = htons(chk->send_size);
11004         /* Fill out hb parameter */
11005         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11006         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11007         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11008         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11009         /* Did our user request this one, put it in */
11010         hb->heartbeat.hb_info.user_req = user_req;
11011         hb->heartbeat.hb_info.addr_family = sin->sin_family;
11012         hb->heartbeat.hb_info.addr_len = sin->sin_len;
11013         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11014                 /*
11015                  * we only take from the entropy pool if the address is not
11016                  * confirmed.
11017                  */
11018                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11019                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11020         } else {
11021                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11022                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11023         }
11024         if (sin->sin_family == AF_INET) {
11025                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
11026         } else if (sin->sin_family == AF_INET6) {
11027                 /* We leave the scope the way it is in our lookup table. */
11028                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
11029                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
11030         } else {
11031                 /* huh compiler bug */
11032                 return (0);
11033         }
11034
11035         /*
11036          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
11037          * PF-heartbeats.  Because of this, threshold management is done by
11038          * the t3 timer handler, and does not need to be done upon the send
11039          * of a PF-heartbeat. If CMT PF is on and the destination to which a
11040          * heartbeat is being sent is in PF state, do NOT do threshold
11041          * management.
11042          */
11043         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
11044                 /* ok we have a destination that needs a beat */
11045                 /* lets do the theshold management Qiaobing style */
11046                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
11047                     stcb->asoc.max_send_times)) {
11048                         /*-
11049                          * we have lost the association, in a way this is
11050                          * quite bad since we really are one less time since
11051                          * we really did not send yet. This is the down side
11052                          * to the Q's style as defined in the RFC and not my
11053                          * alternate style defined in the RFC.
11054                          */
11055                         if (chk->data != NULL) {
11056                                 sctp_m_freem(chk->data);
11057                                 chk->data = NULL;
11058                         }
11059                         /*
11060                          * Here we do NOT use the macro since the
11061                          * association is now gone.
11062                          */
11063                         if (chk->whoTo) {
11064                                 sctp_free_remote_addr(chk->whoTo);
11065                                 chk->whoTo = NULL;
11066                         }
11067                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
11068                         return (-1);
11069                 }
11070         }
11071         net->hb_responded = 0;
11072         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11073         stcb->asoc.ctrl_queue_cnt++;
11074         SCTP_STAT_INCR(sctps_sendheartbeat);
11075         /*-
11076          * Call directly med level routine to put out the chunk. It will
11077          * always tumble out control chunks aka HB but it may even tumble
11078          * out data too.
11079          */
11080         return (1);
11081 }
11082
11083 void
11084 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11085     uint32_t high_tsn)
11086 {
11087         struct sctp_association *asoc;
11088         struct sctp_ecne_chunk *ecne;
11089         struct sctp_tmit_chunk *chk;
11090
11091         asoc = &stcb->asoc;
11092         SCTP_TCB_LOCK_ASSERT(stcb);
11093         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11094                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
11095                         /* found a previous ECN_ECHO update it if needed */
11096                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11097                         ecne->tsn = htonl(high_tsn);
11098                         return;
11099                 }
11100         }
11101         /* nope could not find one to update so we must build one */
11102         sctp_alloc_a_chunk(stcb, chk);
11103         if (chk == NULL) {
11104                 return;
11105         }
11106         chk->copy_by_ref = 0;
11107         SCTP_STAT_INCR(sctps_sendecne);
11108         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11109         chk->rec.chunk_id.can_take_data = 0;
11110         chk->asoc = &stcb->asoc;
11111         chk->send_size = sizeof(struct sctp_ecne_chunk);
11112         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11113         if (chk->data == NULL) {
11114                 sctp_free_a_chunk(stcb, chk);
11115                 return;
11116         }
11117         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11118         SCTP_BUF_LEN(chk->data) = chk->send_size;
11119         chk->sent = SCTP_DATAGRAM_UNSENT;
11120         chk->snd_count = 0;
11121         chk->whoTo = net;
11122         atomic_add_int(&chk->whoTo->ref_count, 1);
11123         stcb->asoc.ecn_echo_cnt_onq++;
11124         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11125         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11126         ecne->ch.chunk_flags = 0;
11127         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11128         ecne->tsn = htonl(high_tsn);
11129         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11130         asoc->ctrl_queue_cnt++;
11131 }
11132
11133 void
11134 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11135     struct mbuf *m, int iphlen, int bad_crc)
11136 {
11137         struct sctp_association *asoc;
11138         struct sctp_pktdrop_chunk *drp;
11139         struct sctp_tmit_chunk *chk;
11140         uint8_t *datap;
11141         int len;
11142         int was_trunc = 0;
11143         struct ip *iph;
11144
11145 #ifdef INET6
11146         struct ip6_hdr *ip6h;
11147
11148 #endif
11149         int fullsz = 0, extra = 0;
11150         long spc;
11151         int offset;
11152         struct sctp_chunkhdr *ch, chunk_buf;
11153         unsigned int chk_length;
11154
11155         if (!stcb) {
11156                 return;
11157         }
11158         asoc = &stcb->asoc;
11159         SCTP_TCB_LOCK_ASSERT(stcb);
11160         if (asoc->peer_supports_pktdrop == 0) {
11161                 /*-
11162                  * peer must declare support before I send one.
11163                  */
11164                 return;
11165         }
11166         if (stcb->sctp_socket == NULL) {
11167                 return;
11168         }
11169         sctp_alloc_a_chunk(stcb, chk);
11170         if (chk == NULL) {
11171                 return;
11172         }
11173         chk->copy_by_ref = 0;
11174         iph = mtod(m, struct ip *);
11175         if (iph == NULL) {
11176                 sctp_free_a_chunk(stcb, chk);
11177                 return;
11178         }
11179         switch (iph->ip_v) {
11180         case IPVERSION:
11181                 /* IPv4 */
11182                 len = chk->send_size = iph->ip_len;
11183                 break;
11184 #ifdef INET6
11185         case IPV6_VERSION >> 4:
11186                 /* IPv6 */
11187                 ip6h = mtod(m, struct ip6_hdr *);
11188                 len = chk->send_size = htons(ip6h->ip6_plen);
11189                 break;
11190 #endif
11191         default:
11192                 return;
11193         }
11194         /* Validate that we do not have an ABORT in here. */
11195         offset = iphlen + sizeof(struct sctphdr);
11196         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11197             sizeof(*ch), (uint8_t *) & chunk_buf);
11198         while (ch != NULL) {
11199                 chk_length = ntohs(ch->chunk_length);
11200                 if (chk_length < sizeof(*ch)) {
11201                         /* break to abort land */
11202                         break;
11203                 }
11204                 switch (ch->chunk_type) {
11205                 case SCTP_PACKET_DROPPED:
11206                 case SCTP_ABORT_ASSOCIATION:
11207                         /*-
11208                          * we don't respond with an PKT-DROP to an ABORT
11209                          * or PKT-DROP
11210                          */
11211                         sctp_free_a_chunk(stcb, chk);
11212                         return;
11213                 default:
11214                         break;
11215                 }
11216                 offset += SCTP_SIZE32(chk_length);
11217                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11218                     sizeof(*ch), (uint8_t *) & chunk_buf);
11219         }
11220
11221         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11222             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11223                 /*
11224                  * only send 1 mtu worth, trim off the excess on the end.
11225                  */
11226                 fullsz = len - extra;
11227                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11228                 was_trunc = 1;
11229         }
11230         chk->asoc = &stcb->asoc;
11231         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11232         if (chk->data == NULL) {
11233 jump_out:
11234                 sctp_free_a_chunk(stcb, chk);
11235                 return;
11236         }
11237         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11238         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11239         if (drp == NULL) {
11240                 sctp_m_freem(chk->data);
11241                 chk->data = NULL;
11242                 goto jump_out;
11243         }
11244         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11245             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11246         chk->book_size_scale = 0;
11247         if (was_trunc) {
11248                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11249                 drp->trunc_len = htons(fullsz);
11250                 /*
11251                  * Len is already adjusted to size minus overhead above take
11252                  * out the pkt_drop chunk itself from it.
11253                  */
11254                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11255                 len = chk->send_size;
11256         } else {
11257                 /* no truncation needed */
11258                 drp->ch.chunk_flags = 0;
11259                 drp->trunc_len = htons(0);
11260         }
11261         if (bad_crc) {
11262                 drp->ch.chunk_flags |= SCTP_BADCRC;
11263         }
11264         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11265         SCTP_BUF_LEN(chk->data) = chk->send_size;
11266         chk->sent = SCTP_DATAGRAM_UNSENT;
11267         chk->snd_count = 0;
11268         if (net) {
11269                 /* we should hit here */
11270                 chk->whoTo = net;
11271         } else {
11272                 chk->whoTo = asoc->primary_destination;
11273         }
11274         atomic_add_int(&chk->whoTo->ref_count, 1);
11275         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11276         chk->rec.chunk_id.can_take_data = 1;
11277         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11278         drp->ch.chunk_length = htons(chk->send_size);
11279         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11280         if (spc < 0) {
11281                 spc = 0;
11282         }
11283         drp->bottle_bw = htonl(spc);
11284         if (asoc->my_rwnd) {
11285                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11286                     asoc->size_on_all_streams +
11287                     asoc->my_rwnd_control_len +
11288                     stcb->sctp_socket->so_rcv.sb_cc);
11289         } else {
11290                 /*-
11291                  * If my rwnd is 0, possibly from mbuf depletion as well as
11292                  * space used, tell the peer there is NO space aka onq == bw
11293                  */
11294                 drp->current_onq = htonl(spc);
11295         }
11296         drp->reserved = 0;
11297         datap = drp->data;
11298         m_copydata(m, iphlen, len, (caddr_t)datap);
11299         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11300         asoc->ctrl_queue_cnt++;
11301 }
11302
11303 void
11304 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11305 {
11306         struct sctp_association *asoc;
11307         struct sctp_cwr_chunk *cwr;
11308         struct sctp_tmit_chunk *chk;
11309
11310         asoc = &stcb->asoc;
11311         SCTP_TCB_LOCK_ASSERT(stcb);
11312         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11313                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11314                         /* found a previous ECN_CWR update it if needed */
11315                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11316                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11317                             MAX_TSN)) {
11318                                 cwr->tsn = htonl(high_tsn);
11319                         }
11320                         return;
11321                 }
11322         }
11323         /* nope could not find one to update so we must build one */
11324         sctp_alloc_a_chunk(stcb, chk);
11325         if (chk == NULL) {
11326                 return;
11327         }
11328         chk->copy_by_ref = 0;
11329         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11330         chk->rec.chunk_id.can_take_data = 1;
11331         chk->asoc = &stcb->asoc;
11332         chk->send_size = sizeof(struct sctp_cwr_chunk);
11333         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11334         if (chk->data == NULL) {
11335                 sctp_free_a_chunk(stcb, chk);
11336                 return;
11337         }
11338         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11339         SCTP_BUF_LEN(chk->data) = chk->send_size;
11340         chk->sent = SCTP_DATAGRAM_UNSENT;
11341         chk->snd_count = 0;
11342         chk->whoTo = net;
11343         atomic_add_int(&chk->whoTo->ref_count, 1);
11344         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11345         cwr->ch.chunk_type = SCTP_ECN_CWR;
11346         cwr->ch.chunk_flags = 0;
11347         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11348         cwr->tsn = htonl(high_tsn);
11349         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11350         asoc->ctrl_queue_cnt++;
11351 }
11352
11353 void
11354 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11355     int number_entries, uint16_t * list,
11356     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11357 {
11358         int len, old_len, i;
11359         struct sctp_stream_reset_out_request *req_out;
11360         struct sctp_chunkhdr *ch;
11361
11362         ch = mtod(chk->data, struct sctp_chunkhdr *);
11363
11364
11365         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11366
11367         /* get to new offset for the param. */
11368         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11369         /* now how long will this param be? */
11370         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11371         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11372         req_out->ph.param_length = htons(len);
11373         req_out->request_seq = htonl(seq);
11374         req_out->response_seq = htonl(resp_seq);
11375         req_out->send_reset_at_tsn = htonl(last_sent);
11376         if (number_entries) {
11377                 for (i = 0; i < number_entries; i++) {
11378                         req_out->list_of_streams[i] = htons(list[i]);
11379                 }
11380         }
11381         if (SCTP_SIZE32(len) > len) {
11382                 /*-
11383                  * Need to worry about the pad we may end up adding to the
11384                  * end. This is easy since the struct is either aligned to 4
11385                  * bytes or 2 bytes off.
11386                  */
11387                 req_out->list_of_streams[number_entries] = 0;
11388         }
11389         /* now fix the chunk length */
11390         ch->chunk_length = htons(len + old_len);
11391         chk->book_size = len + old_len;
11392         chk->book_size_scale = 0;
11393         chk->send_size = SCTP_SIZE32(chk->book_size);
11394         SCTP_BUF_LEN(chk->data) = chk->send_size;
11395         return;
11396 }
11397
11398
11399 void
11400 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11401     int number_entries, uint16_t * list,
11402     uint32_t seq)
11403 {
11404         int len, old_len, i;
11405         struct sctp_stream_reset_in_request *req_in;
11406         struct sctp_chunkhdr *ch;
11407
11408         ch = mtod(chk->data, struct sctp_chunkhdr *);
11409
11410
11411         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11412
11413         /* get to new offset for the param. */
11414         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11415         /* now how long will this param be? */
11416         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11417         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11418         req_in->ph.param_length = htons(len);
11419         req_in->request_seq = htonl(seq);
11420         if (number_entries) {
11421                 for (i = 0; i < number_entries; i++) {
11422                         req_in->list_of_streams[i] = htons(list[i]);
11423                 }
11424         }
11425         if (SCTP_SIZE32(len) > len) {
11426                 /*-
11427                  * Need to worry about the pad we may end up adding to the
11428                  * end. This is easy since the struct is either aligned to 4
11429                  * bytes or 2 bytes off.
11430                  */
11431                 req_in->list_of_streams[number_entries] = 0;
11432         }
11433         /* now fix the chunk length */
11434         ch->chunk_length = htons(len + old_len);
11435         chk->book_size = len + old_len;
11436         chk->book_size_scale = 0;
11437         chk->send_size = SCTP_SIZE32(chk->book_size);
11438         SCTP_BUF_LEN(chk->data) = chk->send_size;
11439         return;
11440 }
11441
11442
11443 void
11444 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11445     uint32_t seq)
11446 {
11447         int len, old_len;
11448         struct sctp_stream_reset_tsn_request *req_tsn;
11449         struct sctp_chunkhdr *ch;
11450
11451         ch = mtod(chk->data, struct sctp_chunkhdr *);
11452
11453
11454         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11455
11456         /* get to new offset for the param. */
11457         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11458         /* now how long will this param be? */
11459         len = sizeof(struct sctp_stream_reset_tsn_request);
11460         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11461         req_tsn->ph.param_length = htons(len);
11462         req_tsn->request_seq = htonl(seq);
11463
11464         /* now fix the chunk length */
11465         ch->chunk_length = htons(len + old_len);
11466         chk->send_size = len + old_len;
11467         chk->book_size = SCTP_SIZE32(chk->send_size);
11468         chk->book_size_scale = 0;
11469         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11470         return;
11471 }
11472
11473 void
11474 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11475     uint32_t resp_seq, uint32_t result)
11476 {
11477         int len, old_len;
11478         struct sctp_stream_reset_response *resp;
11479         struct sctp_chunkhdr *ch;
11480
11481         ch = mtod(chk->data, struct sctp_chunkhdr *);
11482
11483
11484         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11485
11486         /* get to new offset for the param. */
11487         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11488         /* now how long will this param be? */
11489         len = sizeof(struct sctp_stream_reset_response);
11490         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11491         resp->ph.param_length = htons(len);
11492         resp->response_seq = htonl(resp_seq);
11493         resp->result = ntohl(result);
11494
11495         /* now fix the chunk length */
11496         ch->chunk_length = htons(len + old_len);
11497         chk->book_size = len + old_len;
11498         chk->book_size_scale = 0;
11499         chk->send_size = SCTP_SIZE32(chk->book_size);
11500         SCTP_BUF_LEN(chk->data) = chk->send_size;
11501         return;
11502
11503 }
11504
11505
11506 void
11507 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11508     uint32_t resp_seq, uint32_t result,
11509     uint32_t send_una, uint32_t recv_next)
11510 {
11511         int len, old_len;
11512         struct sctp_stream_reset_response_tsn *resp;
11513         struct sctp_chunkhdr *ch;
11514
11515         ch = mtod(chk->data, struct sctp_chunkhdr *);
11516
11517
11518         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11519
11520         /* get to new offset for the param. */
11521         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11522         /* now how long will this param be? */
11523         len = sizeof(struct sctp_stream_reset_response_tsn);
11524         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11525         resp->ph.param_length = htons(len);
11526         resp->response_seq = htonl(resp_seq);
11527         resp->result = htonl(result);
11528         resp->senders_next_tsn = htonl(send_una);
11529         resp->receivers_next_tsn = htonl(recv_next);
11530
11531         /* now fix the chunk length */
11532         ch->chunk_length = htons(len + old_len);
11533         chk->book_size = len + old_len;
11534         chk->send_size = SCTP_SIZE32(chk->book_size);
11535         chk->book_size_scale = 0;
11536         SCTP_BUF_LEN(chk->data) = chk->send_size;
11537         return;
11538 }
11539
11540 static void
11541 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11542     uint32_t seq,
11543     uint16_t adding)
11544 {
11545         int len, old_len;
11546         struct sctp_chunkhdr *ch;
11547         struct sctp_stream_reset_add_strm *addstr;
11548
11549         ch = mtod(chk->data, struct sctp_chunkhdr *);
11550         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11551
11552         /* get to new offset for the param. */
11553         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11554         /* now how long will this param be? */
11555         len = sizeof(struct sctp_stream_reset_add_strm);
11556
11557         /* Fill it out. */
11558         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11559         addstr->ph.param_length = htons(len);
11560         addstr->request_seq = htonl(seq);
11561         addstr->number_of_streams = htons(adding);
11562         addstr->reserved = 0;
11563
11564         /* now fix the chunk length */
11565         ch->chunk_length = htons(len + old_len);
11566         chk->send_size = len + old_len;
11567         chk->book_size = SCTP_SIZE32(chk->send_size);
11568         chk->book_size_scale = 0;
11569         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11570         return;
11571 }
11572
11573 int
11574 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11575     int number_entries, uint16_t * list,
11576     uint8_t send_out_req,
11577     uint32_t resp_seq,
11578     uint8_t send_in_req,
11579     uint8_t send_tsn_req,
11580     uint8_t add_stream,
11581     uint16_t adding
11582 )
11583 {
11584
11585         struct sctp_association *asoc;
11586         struct sctp_tmit_chunk *chk;
11587         struct sctp_chunkhdr *ch;
11588         uint32_t seq;
11589
11590         asoc = &stcb->asoc;
11591         if (asoc->stream_reset_outstanding) {
11592                 /*-
11593                  * Already one pending, must get ACK back to clear the flag.
11594                  */
11595                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11596                 return (EBUSY);
11597         }
11598         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11599             (add_stream == 0)) {
11600                 /* nothing to do */
11601                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11602                 return (EINVAL);
11603         }
11604         if (send_tsn_req && (send_out_req || send_in_req)) {
11605                 /* error, can't do that */
11606                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11607                 return (EINVAL);
11608         }
11609         sctp_alloc_a_chunk(stcb, chk);
11610         if (chk == NULL) {
11611                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11612                 return (ENOMEM);
11613         }
11614         chk->copy_by_ref = 0;
11615         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11616         chk->rec.chunk_id.can_take_data = 0;
11617         chk->asoc = &stcb->asoc;
11618         chk->book_size = sizeof(struct sctp_chunkhdr);
11619         chk->send_size = SCTP_SIZE32(chk->book_size);
11620         chk->book_size_scale = 0;
11621
11622         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11623         if (chk->data == NULL) {
11624                 sctp_free_a_chunk(stcb, chk);
11625                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11626                 return (ENOMEM);
11627         }
11628         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11629
11630         /* setup chunk parameters */
11631         chk->sent = SCTP_DATAGRAM_UNSENT;
11632         chk->snd_count = 0;
11633         chk->whoTo = asoc->primary_destination;
11634         atomic_add_int(&chk->whoTo->ref_count, 1);
11635
11636         ch = mtod(chk->data, struct sctp_chunkhdr *);
11637         ch->chunk_type = SCTP_STREAM_RESET;
11638         ch->chunk_flags = 0;
11639         ch->chunk_length = htons(chk->book_size);
11640         SCTP_BUF_LEN(chk->data) = chk->send_size;
11641
11642         seq = stcb->asoc.str_reset_seq_out;
11643         if (send_out_req) {
11644                 sctp_add_stream_reset_out(chk, number_entries, list,
11645                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11646                 asoc->stream_reset_out_is_outstanding = 1;
11647                 seq++;
11648                 asoc->stream_reset_outstanding++;
11649         }
11650         if (add_stream) {
11651                 sctp_add_a_stream(chk, seq, adding);
11652                 seq++;
11653                 asoc->stream_reset_outstanding++;
11654         }
11655         if (send_in_req) {
11656                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11657                 asoc->stream_reset_outstanding++;
11658         }
11659         if (send_tsn_req) {
11660                 sctp_add_stream_reset_tsn(chk, seq);
11661                 asoc->stream_reset_outstanding++;
11662         }
11663         asoc->str_reset = chk;
11664
11665         /* insert the chunk for sending */
11666         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11667             chk,
11668             sctp_next);
11669         asoc->ctrl_queue_cnt++;
11670         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11671         return (0);
11672 }
11673
11674 void
11675 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11676     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11677 {
11678         /*-
11679          * Formulate the abort message, and send it back down.
11680          */
11681         struct mbuf *o_pak;
11682         struct mbuf *mout;
11683         struct sctp_abort_msg *abm;
11684         struct ip *iph, *iph_out;
11685         struct udphdr *udp;
11686
11687 #ifdef INET6
11688         struct ip6_hdr *ip6, *ip6_out;
11689
11690 #endif
11691         int iphlen_out, len;
11692
11693         /* don't respond to ABORT with ABORT */
11694         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11695                 if (err_cause)
11696                         sctp_m_freem(err_cause);
11697                 return;
11698         }
11699         iph = mtod(m, struct ip *);
11700         switch (iph->ip_v) {
11701         case IPVERSION:
11702                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11703                 break;
11704 #ifdef INET6
11705         case IPV6_VERSION >> 4:
11706                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11707                 break;
11708 #endif
11709         default:
11710                 if (err_cause) {
11711                         sctp_m_freem(err_cause);
11712                 }
11713                 return;
11714         }
11715         if (port) {
11716                 len += sizeof(struct udphdr);
11717         }
11718         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11719         if (mout == NULL) {
11720                 if (err_cause) {
11721                         sctp_m_freem(err_cause);
11722                 }
11723                 return;
11724         }
11725         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11726         SCTP_BUF_LEN(mout) = len;
11727         SCTP_BUF_NEXT(mout) = err_cause;
11728         iph_out = NULL;
11729 #ifdef INET6
11730         ip6_out = NULL;
11731 #endif
11732         switch (iph->ip_v) {
11733         case IPVERSION:
11734                 iph_out = mtod(mout, struct ip *);
11735
11736                 /* Fill in the IP header for the ABORT */
11737                 iph_out->ip_v = IPVERSION;
11738                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11739                 iph_out->ip_tos = (u_char)0;
11740                 iph_out->ip_id = 0;
11741                 iph_out->ip_off = 0;
11742                 iph_out->ip_ttl = MAXTTL;
11743                 if (port) {
11744                         iph_out->ip_p = IPPROTO_UDP;
11745                 } else {
11746                         iph_out->ip_p = IPPROTO_SCTP;
11747                 }
11748                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11749                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11750                 /* let IP layer calculate this */
11751                 iph_out->ip_sum = 0;
11752
11753                 iphlen_out = sizeof(*iph_out);
11754                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11755                 break;
11756 #ifdef INET6
11757         case IPV6_VERSION >> 4:
11758                 ip6 = (struct ip6_hdr *)iph;
11759                 ip6_out = mtod(mout, struct ip6_hdr *);
11760
11761                 /* Fill in the IP6 header for the ABORT */
11762                 ip6_out->ip6_flow = ip6->ip6_flow;
11763                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11764                 if (port) {
11765                         ip6_out->ip6_nxt = IPPROTO_UDP;
11766                 } else {
11767                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11768                 }
11769                 ip6_out->ip6_src = ip6->ip6_dst;
11770                 ip6_out->ip6_dst = ip6->ip6_src;
11771
11772                 iphlen_out = sizeof(*ip6_out);
11773                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11774                 break;
11775 #endif                          /* INET6 */
11776         default:
11777                 /* Currently not supported */
11778                 sctp_m_freem(mout);
11779                 return;
11780         }
11781
11782         udp = (struct udphdr *)abm;
11783         if (port) {
11784                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11785                 udp->uh_dport = port;
11786                 /* set udp->uh_ulen later */
11787                 udp->uh_sum = 0;
11788                 iphlen_out += sizeof(struct udphdr);
11789                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11790         }
11791         abm->sh.src_port = sh->dest_port;
11792         abm->sh.dest_port = sh->src_port;
11793         abm->sh.checksum = 0;
11794         if (vtag == 0) {
11795                 abm->sh.v_tag = sh->v_tag;
11796                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11797         } else {
11798                 abm->sh.v_tag = htonl(vtag);
11799                 abm->msg.ch.chunk_flags = 0;
11800         }
11801         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11802
11803         if (err_cause) {
11804                 struct mbuf *m_tmp = err_cause;
11805                 int err_len = 0;
11806
11807                 /* get length of the err_cause chain */
11808                 while (m_tmp != NULL) {
11809                         err_len += SCTP_BUF_LEN(m_tmp);
11810                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11811                 }
11812                 len = SCTP_BUF_LEN(mout) + err_len;
11813                 if (err_len % 4) {
11814                         /* need pad at end of chunk */
11815                         uint32_t cpthis = 0;
11816                         int padlen;
11817
11818                         padlen = 4 - (len % 4);
11819                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11820                         len += padlen;
11821                 }
11822                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11823         } else {
11824                 len = SCTP_BUF_LEN(mout);
11825                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11826         }
11827
11828         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11829                 /* no mbuf's */
11830                 sctp_m_freem(mout);
11831                 return;
11832         }
11833         if (iph_out != NULL) {
11834                 sctp_route_t ro;
11835                 struct sctp_tcb *stcb = NULL;
11836                 int ret;
11837
11838                 /* zap the stack pointer to the route */
11839                 bzero(&ro, sizeof ro);
11840                 if (port) {
11841                         udp->uh_ulen = htons(len - sizeof(struct ip));
11842                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11843                 }
11844                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11845                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11846                 /* set IPv4 length */
11847                 iph_out->ip_len = len;
11848                 /* out it goes */
11849 #ifdef  SCTP_PACKET_LOGGING
11850                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11851                         sctp_packet_log(mout, len);
11852 #endif
11853                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11854                 if (port) {
11855                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11856                         SCTP_STAT_INCR(sctps_sendswcrc);
11857                         SCTP_ENABLE_UDP_CSUM(o_pak);
11858                 } else {
11859                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11860                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
11861                         SCTP_STAT_INCR(sctps_sendhwcrc);
11862                 }
11863                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11864
11865                 /* Free the route if we got one back */
11866                 if (ro.ro_rt)
11867                         RTFREE(ro.ro_rt);
11868         }
11869 #ifdef INET6
11870         if (ip6_out != NULL) {
11871                 struct route_in6 ro;
11872                 int ret;
11873                 struct sctp_tcb *stcb = NULL;
11874                 struct ifnet *ifp = NULL;
11875
11876                 /* zap the stack pointer to the route */
11877                 bzero(&ro, sizeof(ro));
11878                 if (port) {
11879                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11880                 }
11881                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11882                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11883                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11884 #ifdef  SCTP_PACKET_LOGGING
11885                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11886                         sctp_packet_log(mout, len);
11887 #endif
11888                 abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11889                 SCTP_STAT_INCR(sctps_sendswcrc);
11890                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11891                 if (port) {
11892                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11893                                 udp->uh_sum = 0xffff;
11894                         }
11895                 }
11896                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11897
11898                 /* Free the route if we got one back */
11899                 if (ro.ro_rt)
11900                         RTFREE(ro.ro_rt);
11901         }
11902 #endif
11903         SCTP_STAT_INCR(sctps_sendpackets);
11904         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11905         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11906 }
11907
11908 void
11909 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11910     uint32_t vrf_id, uint16_t port)
11911 {
11912         struct mbuf *o_pak;
11913         struct sctphdr *sh, *sh_out;
11914         struct sctp_chunkhdr *ch;
11915         struct ip *iph, *iph_out;
11916         struct udphdr *udp = NULL;
11917         struct mbuf *mout;
11918
11919 #ifdef INET6
11920         struct ip6_hdr *ip6, *ip6_out;
11921
11922 #endif
11923         int iphlen_out, len;
11924
11925         iph = mtod(m, struct ip *);
11926         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11927         switch (iph->ip_v) {
11928         case IPVERSION:
11929                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11930                 break;
11931 #ifdef INET6
11932         case IPV6_VERSION >> 4:
11933                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11934                 break;
11935 #endif
11936         default:
11937                 if (scm) {
11938                         sctp_m_freem(scm);
11939                 }
11940                 return;
11941         }
11942         if (port) {
11943                 len += sizeof(struct udphdr);
11944         }
11945         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11946         if (mout == NULL) {
11947                 if (scm) {
11948                         sctp_m_freem(scm);
11949                 }
11950                 return;
11951         }
11952         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11953         SCTP_BUF_LEN(mout) = len;
11954         SCTP_BUF_NEXT(mout) = scm;
11955         iph_out = NULL;
11956 #ifdef INET6
11957         ip6_out = NULL;
11958 #endif
11959         switch (iph->ip_v) {
11960         case IPVERSION:
11961                 iph_out = mtod(mout, struct ip *);
11962
11963                 /* Fill in the IP header for the ABORT */
11964                 iph_out->ip_v = IPVERSION;
11965                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11966                 iph_out->ip_tos = (u_char)0;
11967                 iph_out->ip_id = 0;
11968                 iph_out->ip_off = 0;
11969                 iph_out->ip_ttl = MAXTTL;
11970                 if (port) {
11971                         iph_out->ip_p = IPPROTO_UDP;
11972                 } else {
11973                         iph_out->ip_p = IPPROTO_SCTP;
11974                 }
11975                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11976                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11977                 /* let IP layer calculate this */
11978                 iph_out->ip_sum = 0;
11979
11980                 iphlen_out = sizeof(struct ip);
11981                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11982                 break;
11983 #ifdef INET6
11984         case IPV6_VERSION >> 4:
11985                 ip6 = (struct ip6_hdr *)iph;
11986                 ip6_out = mtod(mout, struct ip6_hdr *);
11987
11988                 /* Fill in the IP6 header for the ABORT */
11989                 ip6_out->ip6_flow = ip6->ip6_flow;
11990                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11991                 if (port) {
11992                         ip6_out->ip6_nxt = IPPROTO_UDP;
11993                 } else {
11994                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11995                 }
11996                 ip6_out->ip6_src = ip6->ip6_dst;
11997                 ip6_out->ip6_dst = ip6->ip6_src;
11998
11999                 iphlen_out = sizeof(struct ip6_hdr);
12000                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12001                 break;
12002 #endif                          /* INET6 */
12003         default:
12004                 /* Currently not supported */
12005                 sctp_m_freem(mout);
12006                 return;
12007         }
12008
12009         udp = (struct udphdr *)sh_out;
12010         if (port) {
12011                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12012                 udp->uh_dport = port;
12013                 /* set udp->uh_ulen later */
12014                 udp->uh_sum = 0;
12015                 iphlen_out += sizeof(struct udphdr);
12016                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12017         }
12018         sh_out->src_port = sh->dest_port;
12019         sh_out->dest_port = sh->src_port;
12020         sh_out->v_tag = vtag;
12021         sh_out->checksum = 0;
12022
12023         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12024         ch->chunk_type = SCTP_OPERATION_ERROR;
12025         ch->chunk_flags = 0;
12026
12027         if (scm) {
12028                 struct mbuf *m_tmp = scm;
12029                 int cause_len = 0;
12030
12031                 /* get length of the err_cause chain */
12032                 while (m_tmp != NULL) {
12033                         cause_len += SCTP_BUF_LEN(m_tmp);
12034                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12035                 }
12036                 len = SCTP_BUF_LEN(mout) + cause_len;
12037                 if (cause_len % 4) {
12038                         /* need pad at end of chunk */
12039                         uint32_t cpthis = 0;
12040                         int padlen;
12041
12042                         padlen = 4 - (len % 4);
12043                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12044                         len += padlen;
12045                 }
12046                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12047         } else {
12048                 len = SCTP_BUF_LEN(mout);
12049                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12050         }
12051
12052         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12053                 /* no mbuf's */
12054                 sctp_m_freem(mout);
12055                 return;
12056         }
12057         if (iph_out != NULL) {
12058                 sctp_route_t ro;
12059                 struct sctp_tcb *stcb = NULL;
12060                 int ret;
12061
12062                 /* zap the stack pointer to the route */
12063                 bzero(&ro, sizeof ro);
12064                 if (port) {
12065                         udp->uh_ulen = htons(len - sizeof(struct ip));
12066                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12067                 }
12068                 /* set IPv4 length */
12069                 iph_out->ip_len = len;
12070                 /* out it goes */
12071 #ifdef  SCTP_PACKET_LOGGING
12072                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12073                         sctp_packet_log(mout, len);
12074 #endif
12075                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12076                 if (port) {
12077                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12078                         SCTP_STAT_INCR(sctps_sendswcrc);
12079                         SCTP_ENABLE_UDP_CSUM(o_pak);
12080                 } else {
12081                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12082                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
12083                         SCTP_STAT_INCR(sctps_sendhwcrc);
12084                 }
12085                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
12086
12087                 /* Free the route if we got one back */
12088                 if (ro.ro_rt)
12089                         RTFREE(ro.ro_rt);
12090         }
12091 #ifdef INET6
12092         if (ip6_out != NULL) {
12093                 struct route_in6 ro;
12094                 int ret;
12095                 struct sctp_tcb *stcb = NULL;
12096                 struct ifnet *ifp = NULL;
12097
12098                 /* zap the stack pointer to the route */
12099                 bzero(&ro, sizeof(ro));
12100                 if (port) {
12101                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12102                 }
12103                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12104 #ifdef  SCTP_PACKET_LOGGING
12105                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12106                         sctp_packet_log(mout, len);
12107 #endif
12108                 sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12109                 SCTP_STAT_INCR(sctps_sendswcrc);
12110                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12111                 if (port) {
12112                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12113                                 udp->uh_sum = 0xffff;
12114                         }
12115                 }
12116                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
12117
12118                 /* Free the route if we got one back */
12119                 if (ro.ro_rt)
12120                         RTFREE(ro.ro_rt);
12121         }
12122 #endif
12123         SCTP_STAT_INCR(sctps_sendpackets);
12124         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12125         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12126 }
12127
12128 static struct mbuf *
12129 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12130     struct uio *uio,
12131     struct sctp_sndrcvinfo *srcv,
12132     int max_send_len,
12133     int user_marks_eor,
12134     int *error,
12135     uint32_t * sndout,
12136     struct mbuf **new_tail)
12137 {
12138         struct mbuf *m;
12139
12140         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12141             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12142         if (m == NULL) {
12143                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12144                 *error = ENOMEM;
12145         } else {
12146                 *sndout = m_length(m, NULL);
12147                 *new_tail = m_last(m);
12148         }
12149         return (m);
12150 }
12151
12152 static int
12153 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12154     struct uio *uio,
12155     int resv_upfront)
12156 {
12157         int left;
12158
12159         left = sp->length;
12160         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12161             resv_upfront, 0);
12162         if (sp->data == NULL) {
12163                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12164                 return (ENOMEM);
12165         }
12166         sp->tail_mbuf = m_last(sp->data);
12167         return (0);
12168 }
12169
12170
12171
12172 static struct sctp_stream_queue_pending *
12173 sctp_copy_it_in(struct sctp_tcb *stcb,
12174     struct sctp_association *asoc,
12175     struct sctp_sndrcvinfo *srcv,
12176     struct uio *uio,
12177     struct sctp_nets *net,
12178     int max_send_len,
12179     int user_marks_eor,
12180     int *error,
12181     int non_blocking)
12182 {
12183         /*-
12184          * This routine must be very careful in its work. Protocol
12185          * processing is up and running so care must be taken to spl...()
12186          * when you need to do something that may effect the stcb/asoc. The
12187          * sb is locked however. When data is copied the protocol processing
12188          * should be enabled since this is a slower operation...
12189          */
12190         struct sctp_stream_queue_pending *sp = NULL;
12191         int resv_in_first;
12192
12193         *error = 0;
12194         /* Now can we send this? */
12195         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12196             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12197             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12198             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12199                 /* got data while shutting down */
12200                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12201                 *error = ECONNRESET;
12202                 goto out_now;
12203         }
12204         sctp_alloc_a_strmoq(stcb, sp);
12205         if (sp == NULL) {
12206                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12207                 *error = ENOMEM;
12208                 goto out_now;
12209         }
12210         sp->act_flags = 0;
12211         sp->sender_all_done = 0;
12212         sp->sinfo_flags = srcv->sinfo_flags;
12213         sp->timetolive = srcv->sinfo_timetolive;
12214         sp->ppid = srcv->sinfo_ppid;
12215         sp->context = srcv->sinfo_context;
12216         sp->strseq = 0;
12217         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12218
12219         sp->stream = srcv->sinfo_stream;
12220         sp->length = min(uio->uio_resid, max_send_len);
12221         if ((sp->length == (uint32_t) uio->uio_resid) &&
12222             ((user_marks_eor == 0) ||
12223             (srcv->sinfo_flags & SCTP_EOF) ||
12224             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12225                 sp->msg_is_complete = 1;
12226         } else {
12227                 sp->msg_is_complete = 0;
12228         }
12229         sp->sender_all_done = 0;
12230         sp->some_taken = 0;
12231         sp->put_last_out = 0;
12232         resv_in_first = sizeof(struct sctp_data_chunk);
12233         sp->data = sp->tail_mbuf = NULL;
12234         if (sp->length == 0) {
12235                 *error = 0;
12236                 goto skip_copy;
12237         }
12238         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12239         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12240                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12241                 sp->holds_key_ref = 1;
12242         }
12243         *error = sctp_copy_one(sp, uio, resv_in_first);
12244 skip_copy:
12245         if (*error) {
12246                 sctp_free_a_strmoq(stcb, sp);
12247                 sp = NULL;
12248         } else {
12249                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12250                         sp->net = net;
12251                         sp->addr_over = 1;
12252                 } else {
12253                         sp->net = asoc->primary_destination;
12254                         sp->addr_over = 0;
12255                 }
12256                 atomic_add_int(&sp->net->ref_count, 1);
12257                 sctp_set_prsctp_policy(sp);
12258         }
12259 out_now:
12260         return (sp);
12261 }
12262
12263
12264 int
12265 sctp_sosend(struct socket *so,
12266     struct sockaddr *addr,
12267     struct uio *uio,
12268     struct mbuf *top,
12269     struct mbuf *control,
12270     int flags,
12271     struct thread *p
12272 )
12273 {
12274         struct sctp_inpcb *inp;
12275         int error, use_rcvinfo = 0;
12276         struct sctp_sndrcvinfo srcv;
12277         struct sockaddr *addr_to_use;
12278
12279 #ifdef INET6
12280         struct sockaddr_in sin;
12281
12282 #endif
12283
12284         inp = (struct sctp_inpcb *)so->so_pcb;
12285         if (control) {
12286                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12287                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12288                     sizeof(srcv))) {
12289                         /* got one */
12290                         use_rcvinfo = 1;
12291                 }
12292         }
12293         addr_to_use = addr;
12294 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
12295         if ((addr) && (addr->sa_family == AF_INET6)) {
12296                 struct sockaddr_in6 *sin6;
12297
12298                 sin6 = (struct sockaddr_in6 *)addr;
12299                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12300                         in6_sin6_2_sin(&sin, sin6);
12301                         addr_to_use = (struct sockaddr *)&sin;
12302                 }
12303         }
12304 #endif
12305         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12306             control,
12307             flags,
12308             use_rcvinfo, &srcv
12309             ,p
12310             );
12311         return (error);
12312 }
12313
12314
12315 int
12316 sctp_lower_sosend(struct socket *so,
12317     struct sockaddr *addr,
12318     struct uio *uio,
12319     struct mbuf *i_pak,
12320     struct mbuf *control,
12321     int flags,
12322     int use_rcvinfo,
12323     struct sctp_sndrcvinfo *srcv
12324     ,
12325     struct thread *p
12326 )
12327 {
12328         unsigned int sndlen = 0, max_len;
12329         int error, len;
12330         struct mbuf *top = NULL;
12331         int queue_only = 0, queue_only_for_init = 0;
12332         int free_cnt_applied = 0;
12333         int un_sent = 0;
12334         int now_filled = 0;
12335         unsigned int inqueue_bytes = 0;
12336         struct sctp_block_entry be;
12337         struct sctp_inpcb *inp;
12338         struct sctp_tcb *stcb = NULL;
12339         struct timeval now;
12340         struct sctp_nets *net;
12341         struct sctp_association *asoc;
12342         struct sctp_inpcb *t_inp;
12343         int user_marks_eor;
12344         int create_lock_applied = 0;
12345         int nagle_applies = 0;
12346         int some_on_control = 0;
12347         int got_all_of_the_send = 0;
12348         int hold_tcblock = 0;
12349         int non_blocking = 0;
12350         int temp_flags = 0;
12351         uint32_t local_add_more, local_soresv = 0;
12352
12353         error = 0;
12354         net = NULL;
12355         stcb = NULL;
12356         asoc = NULL;
12357
12358         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12359         if (inp == NULL) {
12360                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12361                 error = EINVAL;
12362                 if (i_pak) {
12363                         SCTP_RELEASE_PKT(i_pak);
12364                 }
12365                 return (error);
12366         }
12367         if ((uio == NULL) && (i_pak == NULL)) {
12368                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12369                 return (EINVAL);
12370         }
12371         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12372         atomic_add_int(&inp->total_sends, 1);
12373         if (uio) {
12374                 if (uio->uio_resid < 0) {
12375                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12376                         return (EINVAL);
12377                 }
12378                 sndlen = uio->uio_resid;
12379         } else {
12380                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12381                 sndlen = SCTP_HEADER_LEN(i_pak);
12382         }
12383         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12384             addr,
12385             sndlen);
12386         /*-
12387          * Pre-screen address, if one is given the sin-len
12388          * must be set correctly!
12389          */
12390         if (addr) {
12391                 if ((addr->sa_family == AF_INET) &&
12392                     (addr->sa_len != sizeof(struct sockaddr_in))) {
12393                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12394                         error = EINVAL;
12395                         goto out_unlocked;
12396                 } else if ((addr->sa_family == AF_INET6) &&
12397                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
12398                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12399                         error = EINVAL;
12400                         goto out_unlocked;
12401                 }
12402         }
12403         hold_tcblock = 0;
12404
12405         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12406             (inp->sctp_socket->so_qlimit)) {
12407                 /* The listener can NOT send */
12408                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12409                 error = ENOTCONN;
12410                 goto out_unlocked;
12411         }
12412         if ((use_rcvinfo) && srcv) {
12413                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
12414                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
12415                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12416                         error = EINVAL;
12417                         goto out_unlocked;
12418                 }
12419                 if (srcv->sinfo_flags)
12420                         SCTP_STAT_INCR(sctps_sends_with_flags);
12421
12422                 if (srcv->sinfo_flags & SCTP_SENDALL) {
12423                         /* its a sendall */
12424                         error = sctp_sendall(inp, uio, top, srcv);
12425                         top = NULL;
12426                         goto out_unlocked;
12427                 }
12428         }
12429         /* now we must find the assoc */
12430         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12431             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12432                 SCTP_INP_RLOCK(inp);
12433                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12434                 if (stcb == NULL) {
12435                         SCTP_INP_RUNLOCK(inp);
12436                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12437                         error = ENOTCONN;
12438                         goto out_unlocked;
12439                 }
12440                 SCTP_TCB_LOCK(stcb);
12441                 hold_tcblock = 1;
12442                 SCTP_INP_RUNLOCK(inp);
12443                 if (addr) {
12444                         /* Must locate the net structure if addr given */
12445                         net = sctp_findnet(stcb, addr);
12446                         if (net) {
12447                                 /* validate port was 0 or correct */
12448                                 struct sockaddr_in *sin;
12449
12450                                 sin = (struct sockaddr_in *)addr;
12451                                 if ((sin->sin_port != 0) &&
12452                                     (sin->sin_port != stcb->rport)) {
12453                                         net = NULL;
12454                                 }
12455                         }
12456                         temp_flags |= SCTP_ADDR_OVER;
12457                 } else
12458                         net = stcb->asoc.primary_destination;
12459                 if (addr && (net == NULL)) {
12460                         /* Could not find address, was it legal */
12461                         if (addr->sa_family == AF_INET) {
12462                                 struct sockaddr_in *sin;
12463
12464                                 sin = (struct sockaddr_in *)addr;
12465                                 if (sin->sin_addr.s_addr == 0) {
12466                                         if ((sin->sin_port == 0) ||
12467                                             (sin->sin_port == stcb->rport)) {
12468                                                 net = stcb->asoc.primary_destination;
12469                                         }
12470                                 }
12471                         } else {
12472                                 struct sockaddr_in6 *sin6;
12473
12474                                 sin6 = (struct sockaddr_in6 *)addr;
12475                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
12476                                         if ((sin6->sin6_port == 0) ||
12477                                             (sin6->sin6_port == stcb->rport)) {
12478                                                 net = stcb->asoc.primary_destination;
12479                                         }
12480                                 }
12481                         }
12482                 }
12483                 if (net == NULL) {
12484                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12485                         error = EINVAL;
12486                         goto out_unlocked;
12487                 }
12488         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
12489                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
12490                 if (stcb) {
12491                         if (addr)
12492                                 /*
12493                                  * Must locate the net structure if addr
12494                                  * given
12495                                  */
12496                                 net = sctp_findnet(stcb, addr);
12497                         else
12498                                 net = stcb->asoc.primary_destination;
12499                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
12500                             ((net == NULL) || (addr == NULL))) {
12501                                 struct sockaddr_in *sin;
12502
12503                                 if (addr == NULL) {
12504                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12505                                         error = EINVAL;
12506                                         goto out_unlocked;
12507                                 }
12508                                 sin = (struct sockaddr_in *)addr;
12509                                 /* Validate port is 0 or correct */
12510                                 if ((sin->sin_port != 0) &&
12511                                     (sin->sin_port != stcb->rport)) {
12512                                         net = NULL;
12513                                 }
12514                         }
12515                 }
12516                 hold_tcblock = 0;
12517         } else if (addr) {
12518                 /*-
12519                  * Since we did not use findep we must
12520                  * increment it, and if we don't find a tcb
12521                  * decrement it.
12522                  */
12523                 SCTP_INP_WLOCK(inp);
12524                 SCTP_INP_INCR_REF(inp);
12525                 SCTP_INP_WUNLOCK(inp);
12526                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12527                 if (stcb == NULL) {
12528                         SCTP_INP_WLOCK(inp);
12529                         SCTP_INP_DECR_REF(inp);
12530                         SCTP_INP_WUNLOCK(inp);
12531                 } else {
12532                         hold_tcblock = 1;
12533                 }
12534         }
12535         if ((stcb == NULL) && (addr)) {
12536                 /* Possible implicit send? */
12537                 SCTP_ASOC_CREATE_LOCK(inp);
12538                 create_lock_applied = 1;
12539                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12540                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12541                         /* Should I really unlock ? */
12542                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12543                         error = EINVAL;
12544                         goto out_unlocked;
12545
12546                 }
12547                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12548                     (addr->sa_family == AF_INET6)) {
12549                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12550                         error = EINVAL;
12551                         goto out_unlocked;
12552                 }
12553                 SCTP_INP_WLOCK(inp);
12554                 SCTP_INP_INCR_REF(inp);
12555                 SCTP_INP_WUNLOCK(inp);
12556                 /* With the lock applied look again */
12557                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12558                 if (stcb == NULL) {
12559                         SCTP_INP_WLOCK(inp);
12560                         SCTP_INP_DECR_REF(inp);
12561                         SCTP_INP_WUNLOCK(inp);
12562                 } else {
12563                         hold_tcblock = 1;
12564                 }
12565                 if (t_inp != inp) {
12566                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12567                         error = ENOTCONN;
12568                         goto out_unlocked;
12569                 }
12570         }
12571         if (stcb == NULL) {
12572                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12573                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12574                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12575                         error = ENOTCONN;
12576                         goto out_unlocked;
12577                 }
12578                 if (addr == NULL) {
12579                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12580                         error = ENOENT;
12581                         goto out_unlocked;
12582                 } else {
12583                         /*
12584                          * UDP style, we must go ahead and start the INIT
12585                          * process
12586                          */
12587                         uint32_t vrf_id;
12588
12589                         if ((use_rcvinfo) && (srcv) &&
12590                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12591                             ((srcv->sinfo_flags & SCTP_EOF) &&
12592                             (sndlen == 0)))) {
12593                                 /*-
12594                                  * User asks to abort a non-existant assoc,
12595                                  * or EOF a non-existant assoc with no data
12596                                  */
12597                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12598                                 error = ENOENT;
12599                                 goto out_unlocked;
12600                         }
12601                         /* get an asoc/stcb struct */
12602                         vrf_id = inp->def_vrf_id;
12603 #ifdef INVARIANTS
12604                         if (create_lock_applied == 0) {
12605                                 panic("Error, should hold create lock and I don't?");
12606                         }
12607 #endif
12608                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12609                             p
12610                             );
12611                         if (stcb == NULL) {
12612                                 /* Error is setup for us in the call */
12613                                 goto out_unlocked;
12614                         }
12615                         if (create_lock_applied) {
12616                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12617                                 create_lock_applied = 0;
12618                         } else {
12619                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12620                         }
12621                         /*
12622                          * Turn on queue only flag to prevent data from
12623                          * being sent
12624                          */
12625                         queue_only = 1;
12626                         asoc = &stcb->asoc;
12627                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12628                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12629
12630                         /* initialize authentication params for the assoc */
12631                         sctp_initialize_auth_params(inp, stcb);
12632
12633                         if (control) {
12634                                 /*
12635                                  * see if a init structure exists in cmsg
12636                                  * headers
12637                                  */
12638                                 struct sctp_initmsg initm;
12639                                 int i;
12640
12641                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12642                                     sizeof(initm))) {
12643                                         /*
12644                                          * we have an INIT override of the
12645                                          * default
12646                                          */
12647                                         if (initm.sinit_max_attempts)
12648                                                 asoc->max_init_times = initm.sinit_max_attempts;
12649                                         if (initm.sinit_num_ostreams)
12650                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12651                                         if (initm.sinit_max_instreams)
12652                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12653                                         if (initm.sinit_max_init_timeo)
12654                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12655                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12656                                                 struct sctp_stream_out *tmp_str;
12657                                                 int had_lock = 0;
12658
12659                                                 /* Default is NOT correct */
12660                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12661                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12662                                                 /*
12663                                                  * What happens if this
12664                                                  * fails? we panic ...
12665                                                  */
12666
12667                                                 if (hold_tcblock) {
12668                                                         had_lock = 1;
12669                                                         SCTP_TCB_UNLOCK(stcb);
12670                                                 }
12671                                                 SCTP_MALLOC(tmp_str,
12672                                                     struct sctp_stream_out *,
12673                                                     (asoc->pre_open_streams *
12674                                                     sizeof(struct sctp_stream_out)),
12675                                                     SCTP_M_STRMO);
12676                                                 if (had_lock) {
12677                                                         SCTP_TCB_LOCK(stcb);
12678                                                 }
12679                                                 if (tmp_str != NULL) {
12680                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12681                                                         asoc->strmout = tmp_str;
12682                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12683                                                 } else {
12684                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12685                                                 }
12686                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12687                                                         /*-
12688                                                          * inbound side must be set
12689                                                          * to 0xffff, also NOTE when
12690                                                          * we get the INIT-ACK back
12691                                                          * (for INIT sender) we MUST
12692                                                          * reduce the count
12693                                                          * (streamoutcnt) but first
12694                                                          * check if we sent to any
12695                                                          * of the upper streams that
12696                                                          * were dropped (if some
12697                                                          * were). Those that were
12698                                                          * dropped must be notified
12699                                                          * to the upper layer as
12700                                                          * failed to send.
12701                                                          */
12702                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12703                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12704                                                         asoc->strmout[i].stream_no = i;
12705                                                         asoc->strmout[i].last_msg_incomplete = 0;
12706                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12707                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12708                                                 }
12709                                         }
12710                                 }
12711                         }
12712                         hold_tcblock = 1;
12713                         /* out with the INIT */
12714                         queue_only_for_init = 1;
12715                         /*-
12716                          * we may want to dig in after this call and adjust the MTU
12717                          * value. It defaulted to 1500 (constant) but the ro
12718                          * structure may now have an update and thus we may need to
12719                          * change it BEFORE we append the message.
12720                          */
12721                         net = stcb->asoc.primary_destination;
12722                         asoc = &stcb->asoc;
12723                 }
12724         }
12725         if ((SCTP_SO_IS_NBIO(so)
12726             || (flags & MSG_NBIO)
12727             )) {
12728                 non_blocking = 1;
12729         }
12730         asoc = &stcb->asoc;
12731         atomic_add_int(&stcb->total_sends, 1);
12732
12733         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12734                 if (sndlen > asoc->smallest_mtu) {
12735                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12736                         error = EMSGSIZE;
12737                         goto out_unlocked;
12738                 }
12739         }
12740         /* would we block? */
12741         if (non_blocking) {
12742                 if (hold_tcblock == 0) {
12743                         SCTP_TCB_LOCK(stcb);
12744                         hold_tcblock = 1;
12745                 }
12746                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12747                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12748                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12749                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12750                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12751                                 error = EMSGSIZE;
12752                         else
12753                                 error = EWOULDBLOCK;
12754                         goto out_unlocked;
12755                 }
12756                 stcb->asoc.sb_send_resv += sndlen;
12757                 SCTP_TCB_UNLOCK(stcb);
12758                 hold_tcblock = 0;
12759         } else {
12760                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12761         }
12762         local_soresv = sndlen;
12763         /* Keep the stcb from being freed under our feet */
12764         if (free_cnt_applied) {
12765 #ifdef INVARIANTS
12766                 panic("refcnt already incremented");
12767 #else
12768                 printf("refcnt:1 already incremented?\n");
12769 #endif
12770         } else {
12771                 atomic_add_int(&stcb->asoc.refcnt, 1);
12772                 free_cnt_applied = 1;
12773         }
12774         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12775                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12776                 error = ECONNRESET;
12777                 goto out_unlocked;
12778         }
12779         if (create_lock_applied) {
12780                 SCTP_ASOC_CREATE_UNLOCK(inp);
12781                 create_lock_applied = 0;
12782         }
12783         if (asoc->stream_reset_outstanding) {
12784                 /*
12785                  * Can't queue any data while stream reset is underway.
12786                  */
12787                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12788                 error = EAGAIN;
12789                 goto out_unlocked;
12790         }
12791         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12792             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12793                 queue_only = 1;
12794         }
12795         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12796                 /* Grab the default stuff from the asoc */
12797                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12798         }
12799         /* we are now done with all control */
12800         if (control) {
12801                 sctp_m_freem(control);
12802                 control = NULL;
12803         }
12804         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12805             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12806             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12807             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12808                 if ((use_rcvinfo) &&
12809                     (srcv->sinfo_flags & SCTP_ABORT)) {
12810                         ;
12811                 } else {
12812                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12813                         error = ECONNRESET;
12814                         goto out_unlocked;
12815                 }
12816         }
12817         /* Ok, we will attempt a msgsnd :> */
12818         if (p) {
12819                 p->td_ru.ru_msgsnd++;
12820         }
12821         if (stcb) {
12822                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12823                         net = stcb->asoc.primary_destination;
12824                 }
12825         }
12826         if (net == NULL) {
12827                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12828                 error = EINVAL;
12829                 goto out_unlocked;
12830         }
12831         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12832                 /*-
12833                  * CMT: Added check for CMT above. net above is the primary
12834                  * dest. If CMT is ON, sender should always attempt to send
12835                  * with the output routine sctp_fill_outqueue() that loops
12836                  * through all destination addresses. Therefore, if CMT is
12837                  * ON, queue_only is NOT set to 1 here, so that
12838                  * sctp_chunk_output() can be called below.
12839                  */
12840                 queue_only = 1;
12841         } else if (asoc->ifp_had_enobuf) {
12842                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12843                 if (net->flight_size > (net->mtu * 2))
12844                         queue_only = 1;
12845                 asoc->ifp_had_enobuf = 0;
12846         } else {
12847                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12848                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12849         }
12850         /* Are we aborting? */
12851         if (srcv->sinfo_flags & SCTP_ABORT) {
12852                 struct mbuf *mm;
12853                 int tot_demand, tot_out = 0, max_out;
12854
12855                 SCTP_STAT_INCR(sctps_sends_with_abort);
12856                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12857                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12858                         /* It has to be up before we abort */
12859                         /* how big is the user initiated abort? */
12860                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12861                         error = EINVAL;
12862                         goto out;
12863                 }
12864                 if (hold_tcblock) {
12865                         SCTP_TCB_UNLOCK(stcb);
12866                         hold_tcblock = 0;
12867                 }
12868                 if (top) {
12869                         struct mbuf *cntm = NULL;
12870
12871                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12872                         if (sndlen != 0) {
12873                                 cntm = top;
12874                                 while (cntm) {
12875                                         tot_out += SCTP_BUF_LEN(cntm);
12876                                         cntm = SCTP_BUF_NEXT(cntm);
12877                                 }
12878                         }
12879                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12880                 } else {
12881                         /* Must fit in a MTU */
12882                         tot_out = sndlen;
12883                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12884                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12885                                 /* To big */
12886                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12887                                 error = EMSGSIZE;
12888                                 goto out;
12889                         }
12890                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12891                 }
12892                 if (mm == NULL) {
12893                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12894                         error = ENOMEM;
12895                         goto out;
12896                 }
12897                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12898                 max_out -= sizeof(struct sctp_abort_msg);
12899                 if (tot_out > max_out) {
12900                         tot_out = max_out;
12901                 }
12902                 if (mm) {
12903                         struct sctp_paramhdr *ph;
12904
12905                         /* now move forward the data pointer */
12906                         ph = mtod(mm, struct sctp_paramhdr *);
12907                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12908                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12909                         ph++;
12910                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12911                         if (top == NULL) {
12912                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12913                                 if (error) {
12914                                         /*-
12915                                          * Here if we can't get his data we
12916                                          * still abort we just don't get to
12917                                          * send the users note :-0
12918                                          */
12919                                         sctp_m_freem(mm);
12920                                         mm = NULL;
12921                                 }
12922                         } else {
12923                                 if (sndlen != 0) {
12924                                         SCTP_BUF_NEXT(mm) = top;
12925                                 }
12926                         }
12927                 }
12928                 if (hold_tcblock == 0) {
12929                         SCTP_TCB_LOCK(stcb);
12930                         hold_tcblock = 1;
12931                 }
12932                 atomic_add_int(&stcb->asoc.refcnt, -1);
12933                 free_cnt_applied = 0;
12934                 /* release this lock, otherwise we hang on ourselves */
12935                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12936                     SCTP_RESPONSE_TO_USER_REQ,
12937                     mm, SCTP_SO_LOCKED);
12938                 /* now relock the stcb so everything is sane */
12939                 hold_tcblock = 0;
12940                 stcb = NULL;
12941                 /*
12942                  * In this case top is already chained to mm avoid double
12943                  * free, since we free it below if top != NULL and driver
12944                  * would free it after sending the packet out
12945                  */
12946                 if (sndlen != 0) {
12947                         top = NULL;
12948                 }
12949                 goto out_unlocked;
12950         }
12951         /* Calculate the maximum we can send */
12952         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12953         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12954                 if (non_blocking) {
12955                         /* we already checked for non-blocking above. */
12956                         max_len = sndlen;
12957                 } else {
12958                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12959                 }
12960         } else {
12961                 max_len = 0;
12962         }
12963         if (hold_tcblock) {
12964                 SCTP_TCB_UNLOCK(stcb);
12965                 hold_tcblock = 0;
12966         }
12967         /* Is the stream no. valid? */
12968         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12969                 /* Invalid stream number */
12970                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12971                 error = EINVAL;
12972                 goto out_unlocked;
12973         }
12974         if (asoc->strmout == NULL) {
12975                 /* huh? software error */
12976                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12977                 error = EFAULT;
12978                 goto out_unlocked;
12979         }
12980         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12981         if ((user_marks_eor == 0) &&
12982             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12983                 /* It will NEVER fit */
12984                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12985                 error = EMSGSIZE;
12986                 goto out_unlocked;
12987         }
12988         if ((uio == NULL) && user_marks_eor) {
12989                 /*-
12990                  * We do not support eeor mode for
12991                  * sending with mbuf chains (like sendfile).
12992                  */
12993                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12994                 error = EINVAL;
12995                 goto out_unlocked;
12996         }
12997         if (user_marks_eor) {
12998                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12999         } else {
13000                 /*-
13001                  * For non-eeor the whole message must fit in
13002                  * the socket send buffer.
13003                  */
13004                 local_add_more = sndlen;
13005         }
13006         len = 0;
13007         if (non_blocking) {
13008                 goto skip_preblock;
13009         }
13010         if (((max_len <= local_add_more) &&
13011             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13012             (max_len == 0) ||
13013             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13014                 /* No room right now ! */
13015                 SOCKBUF_LOCK(&so->so_snd);
13016                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13017                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13018                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13019                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13020                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13021                             inqueue_bytes,
13022                             local_add_more,
13023                             stcb->asoc.stream_queue_cnt,
13024                             stcb->asoc.chunks_on_out_queue,
13025                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13026                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13027                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13028                         }
13029                         be.error = 0;
13030                         stcb->block_entry = &be;
13031                         error = sbwait(&so->so_snd);
13032                         stcb->block_entry = NULL;
13033                         if (error || so->so_error || be.error) {
13034                                 if (error == 0) {
13035                                         if (so->so_error)
13036                                                 error = so->so_error;
13037                                         if (be.error) {
13038                                                 error = be.error;
13039                                         }
13040                                 }
13041                                 SOCKBUF_UNLOCK(&so->so_snd);
13042                                 goto out_unlocked;
13043                         }
13044                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13045                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13046                                     so, asoc, stcb->asoc.total_output_queue_size);
13047                         }
13048                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13049                                 goto out_unlocked;
13050                         }
13051                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13052                 }
13053                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13054                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13055                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13056                 } else {
13057                         max_len = 0;
13058                 }
13059                 SOCKBUF_UNLOCK(&so->so_snd);
13060         }
13061 skip_preblock:
13062         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13063                 goto out_unlocked;
13064         }
13065         /*
13066          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13067          * case NOTE: uio will be null when top/mbuf is passed
13068          */
13069         if (sndlen == 0) {
13070                 if (srcv->sinfo_flags & SCTP_EOF) {
13071                         got_all_of_the_send = 1;
13072                         goto dataless_eof;
13073                 } else {
13074                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13075                         error = EINVAL;
13076                         goto out;
13077                 }
13078         }
13079         if (top == NULL) {
13080                 struct sctp_stream_queue_pending *sp;
13081                 struct sctp_stream_out *strm;
13082                 uint32_t sndout, initial_out;
13083
13084                 initial_out = uio->uio_resid;
13085
13086                 SCTP_TCB_SEND_LOCK(stcb);
13087                 if ((asoc->stream_locked) &&
13088                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13089                         SCTP_TCB_SEND_UNLOCK(stcb);
13090                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13091                         error = EINVAL;
13092                         goto out;
13093                 }
13094                 SCTP_TCB_SEND_UNLOCK(stcb);
13095
13096                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13097                 if (strm->last_msg_incomplete == 0) {
13098         do_a_copy_in:
13099                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13100                         if ((sp == NULL) || (error)) {
13101                                 goto out;
13102                         }
13103                         SCTP_TCB_SEND_LOCK(stcb);
13104                         if (sp->msg_is_complete) {
13105                                 strm->last_msg_incomplete = 0;
13106                                 asoc->stream_locked = 0;
13107                         } else {
13108                                 /*
13109                                  * Just got locked to this guy in case of an
13110                                  * interrupt.
13111                                  */
13112                                 strm->last_msg_incomplete = 1;
13113                                 asoc->stream_locked = 1;
13114                                 asoc->stream_locked_on = srcv->sinfo_stream;
13115                                 sp->sender_all_done = 0;
13116                         }
13117                         sctp_snd_sb_alloc(stcb, sp->length);
13118                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13119                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13120                                 sp->strseq = strm->next_sequence_sent;
13121                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13122                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13123                                             (uintptr_t) stcb, sp->length,
13124                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13125                                 }
13126                                 strm->next_sequence_sent++;
13127                         } else {
13128                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13129                         }
13130                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13131                         if ((strm->next_spoke.tqe_next == NULL) &&
13132                             (strm->next_spoke.tqe_prev == NULL)) {
13133                                 /* Not on wheel, insert */
13134                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
13135                         }
13136                         SCTP_TCB_SEND_UNLOCK(stcb);
13137                 } else {
13138                         SCTP_TCB_SEND_LOCK(stcb);
13139                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13140                         SCTP_TCB_SEND_UNLOCK(stcb);
13141                         if (sp == NULL) {
13142                                 /* ???? Huh ??? last msg is gone */
13143 #ifdef INVARIANTS
13144                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13145 #else
13146                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13147                                 strm->last_msg_incomplete = 0;
13148 #endif
13149                                 goto do_a_copy_in;
13150
13151                         }
13152                 }
13153                 while (uio->uio_resid > 0) {
13154                         /* How much room do we have? */
13155                         struct mbuf *new_tail, *mm;
13156
13157                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13158                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13159                         else
13160                                 max_len = 0;
13161
13162                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13163                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13164                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13165                                 sndout = 0;
13166                                 new_tail = NULL;
13167                                 if (hold_tcblock) {
13168                                         SCTP_TCB_UNLOCK(stcb);
13169                                         hold_tcblock = 0;
13170                                 }
13171                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13172                                 if ((mm == NULL) || error) {
13173                                         if (mm) {
13174                                                 sctp_m_freem(mm);
13175                                         }
13176                                         goto out;
13177                                 }
13178                                 /* Update the mbuf and count */
13179                                 SCTP_TCB_SEND_LOCK(stcb);
13180                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13181                                         /*
13182                                          * we need to get out. Peer probably
13183                                          * aborted.
13184                                          */
13185                                         sctp_m_freem(mm);
13186                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13187                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13188                                                 error = ECONNRESET;
13189                                         }
13190                                         SCTP_TCB_SEND_UNLOCK(stcb);
13191                                         goto out;
13192                                 }
13193                                 if (sp->tail_mbuf) {
13194                                         /* tack it to the end */
13195                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13196                                         sp->tail_mbuf = new_tail;
13197                                 } else {
13198                                         /* A stolen mbuf */
13199                                         sp->data = mm;
13200                                         sp->tail_mbuf = new_tail;
13201                                 }
13202                                 sctp_snd_sb_alloc(stcb, sndout);
13203                                 atomic_add_int(&sp->length, sndout);
13204                                 len += sndout;
13205
13206                                 /* Did we reach EOR? */
13207                                 if ((uio->uio_resid == 0) &&
13208                                     ((user_marks_eor == 0) ||
13209                                     (srcv->sinfo_flags & SCTP_EOF) ||
13210                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13211                                         sp->msg_is_complete = 1;
13212                                 } else {
13213                                         sp->msg_is_complete = 0;
13214                                 }
13215                                 SCTP_TCB_SEND_UNLOCK(stcb);
13216                         }
13217                         if (uio->uio_resid == 0) {
13218                                 /* got it all? */
13219                                 continue;
13220                         }
13221                         /* PR-SCTP? */
13222                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13223                                 /*
13224                                  * This is ugly but we must assure locking
13225                                  * order
13226                                  */
13227                                 if (hold_tcblock == 0) {
13228                                         SCTP_TCB_LOCK(stcb);
13229                                         hold_tcblock = 1;
13230                                 }
13231                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13232                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13233                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13234                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13235                                 else
13236                                         max_len = 0;
13237                                 if (max_len > 0) {
13238                                         continue;
13239                                 }
13240                                 SCTP_TCB_UNLOCK(stcb);
13241                                 hold_tcblock = 0;
13242                         }
13243                         /* wait for space now */
13244                         if (non_blocking) {
13245                                 /* Non-blocking io in place out */
13246                                 goto skip_out_eof;
13247                         }
13248                         if ((net->flight_size > net->cwnd) &&
13249                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13250                                 queue_only = 1;
13251                         } else if (asoc->ifp_had_enobuf) {
13252                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13253                                 if (net->flight_size > (net->mtu * 2)) {
13254                                         queue_only = 1;
13255                                 } else {
13256                                         queue_only = 0;
13257                                 }
13258                                 asoc->ifp_had_enobuf = 0;
13259                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13260                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13261                         } else {
13262                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13263                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13264                                 if (net->flight_size > net->cwnd) {
13265                                         queue_only = 1;
13266                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13267                                 } else {
13268                                         queue_only = 0;
13269                                 }
13270                         }
13271                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13272                             (stcb->asoc.total_flight > 0) &&
13273                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13274                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13275
13276                                 /*-
13277                                  * Ok, Nagle is set on and we have data outstanding.
13278                                  * Don't send anything and let SACKs drive out the
13279                                  * data unless wen have a "full" segment to send.
13280                                  */
13281                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13282                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13283                                 }
13284                                 SCTP_STAT_INCR(sctps_naglequeued);
13285                                 nagle_applies = 1;
13286                         } else {
13287                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13288                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13289                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13290                                 }
13291                                 SCTP_STAT_INCR(sctps_naglesent);
13292                                 nagle_applies = 0;
13293                         }
13294                         /* What about the INIT, send it maybe */
13295                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13296
13297                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13298                                     nagle_applies, un_sent);
13299                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13300                                     stcb->asoc.total_flight,
13301                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13302                         }
13303                         if (queue_only_for_init) {
13304                                 if (hold_tcblock == 0) {
13305                                         SCTP_TCB_LOCK(stcb);
13306                                         hold_tcblock = 1;
13307                                 }
13308                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13309                                         /* a collision took us forward? */
13310                                         queue_only_for_init = 0;
13311                                         queue_only = 0;
13312                                 } else {
13313                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13314                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13315                                         queue_only_for_init = 0;
13316                                         queue_only = 1;
13317                                 }
13318                         }
13319                         if ((queue_only == 0) && (nagle_applies == 0)) {
13320                                 /*-
13321                                  * need to start chunk output
13322                                  * before blocking.. note that if
13323                                  * a lock is already applied, then
13324                                  * the input via the net is happening
13325                                  * and I don't need to start output :-D
13326                                  */
13327                                 if (hold_tcblock == 0) {
13328                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13329                                                 hold_tcblock = 1;
13330                                                 sctp_chunk_output(inp,
13331                                                     stcb,
13332                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13333                                         }
13334                                 } else {
13335                                         sctp_chunk_output(inp,
13336                                             stcb,
13337                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13338                                 }
13339                                 if (hold_tcblock == 1) {
13340                                         SCTP_TCB_UNLOCK(stcb);
13341                                         hold_tcblock = 0;
13342                                 }
13343                         }
13344                         SOCKBUF_LOCK(&so->so_snd);
13345                         /*-
13346                          * This is a bit strange, but I think it will
13347                          * work. The total_output_queue_size is locked and
13348                          * protected by the TCB_LOCK, which we just released.
13349                          * There is a race that can occur between releasing it
13350                          * above, and me getting the socket lock, where sacks
13351                          * come in but we have not put the SB_WAIT on the
13352                          * so_snd buffer to get the wakeup. After the LOCK
13353                          * is applied the sack_processing will also need to
13354                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13355                          * once we have the socket buffer lock if we recheck the
13356                          * size we KNOW we will get to sleep safely with the
13357                          * wakeup flag in place.
13358                          */
13359                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13360                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13361                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13362                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13363                                             so, asoc, uio->uio_resid);
13364                                 }
13365                                 be.error = 0;
13366                                 stcb->block_entry = &be;
13367                                 error = sbwait(&so->so_snd);
13368                                 stcb->block_entry = NULL;
13369
13370                                 if (error || so->so_error || be.error) {
13371                                         if (error == 0) {
13372                                                 if (so->so_error)
13373                                                         error = so->so_error;
13374                                                 if (be.error) {
13375                                                         error = be.error;
13376                                                 }
13377                                         }
13378                                         SOCKBUF_UNLOCK(&so->so_snd);
13379                                         goto out_unlocked;
13380                                 }
13381                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13382                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13383                                             so, asoc, stcb->asoc.total_output_queue_size);
13384                                 }
13385                         }
13386                         SOCKBUF_UNLOCK(&so->so_snd);
13387                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13388                                 goto out_unlocked;
13389                         }
13390                 }
13391                 SCTP_TCB_SEND_LOCK(stcb);
13392                 if (sp) {
13393                         if (sp->msg_is_complete == 0) {
13394                                 strm->last_msg_incomplete = 1;
13395                                 asoc->stream_locked = 1;
13396                                 asoc->stream_locked_on = srcv->sinfo_stream;
13397                         } else {
13398                                 sp->sender_all_done = 1;
13399                                 strm->last_msg_incomplete = 0;
13400                                 asoc->stream_locked = 0;
13401                         }
13402                 } else {
13403                         SCTP_PRINTF("Huh no sp TSNH?\n");
13404                         strm->last_msg_incomplete = 0;
13405                         asoc->stream_locked = 0;
13406                 }
13407                 SCTP_TCB_SEND_UNLOCK(stcb);
13408                 if (uio->uio_resid == 0) {
13409                         got_all_of_the_send = 1;
13410                 }
13411         } else if (top) {
13412                 /* We send in a 0, since we do NOT have any locks */
13413                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13414                 top = NULL;
13415                 if (srcv->sinfo_flags & SCTP_EOF) {
13416                         /*
13417                          * This should only happen for Panda for the mbuf
13418                          * send case, which does NOT yet support EEOR mode.
13419                          * Thus, we can just set this flag to do the proper
13420                          * EOF handling.
13421                          */
13422                         got_all_of_the_send = 1;
13423                 }
13424         }
13425         if (error) {
13426                 goto out;
13427         }
13428 dataless_eof:
13429         /* EOF thing ? */
13430         if ((srcv->sinfo_flags & SCTP_EOF) &&
13431             (got_all_of_the_send == 1) &&
13432             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13433                 int cnt;
13434
13435                 SCTP_STAT_INCR(sctps_sends_with_eof);
13436                 error = 0;
13437                 if (hold_tcblock == 0) {
13438                         SCTP_TCB_LOCK(stcb);
13439                         hold_tcblock = 1;
13440                 }
13441                 cnt = sctp_is_there_unsent_data(stcb);
13442                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13443                     TAILQ_EMPTY(&asoc->sent_queue) &&
13444                     (cnt == 0)) {
13445                         if (asoc->locked_on_sending) {
13446                                 goto abort_anyway;
13447                         }
13448                         /* there is nothing queued to send, so I'm done... */
13449                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13450                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13451                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13452                                 /* only send SHUTDOWN the first time through */
13453                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13454                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13455                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13456                                 }
13457                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13458                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13459                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13460                                     asoc->primary_destination);
13461                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13462                                     asoc->primary_destination);
13463                         }
13464                 } else {
13465                         /*-
13466                          * we still got (or just got) data to send, so set
13467                          * SHUTDOWN_PENDING
13468                          */
13469                         /*-
13470                          * XXX sockets draft says that SCTP_EOF should be
13471                          * sent with no data.  currently, we will allow user
13472                          * data to be sent first and move to
13473                          * SHUTDOWN-PENDING
13474                          */
13475                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13476                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13477                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13478                                 if (hold_tcblock == 0) {
13479                                         SCTP_TCB_LOCK(stcb);
13480                                         hold_tcblock = 1;
13481                                 }
13482                                 if (asoc->locked_on_sending) {
13483                                         /* Locked to send out the data */
13484                                         struct sctp_stream_queue_pending *sp;
13485
13486                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13487                                         if (sp) {
13488                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13489                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13490                                         }
13491                                 }
13492                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13493                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13494                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13495                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13496                         abort_anyway:
13497                                         if (free_cnt_applied) {
13498                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13499                                                 free_cnt_applied = 0;
13500                                         }
13501                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13502                                             SCTP_RESPONSE_TO_USER_REQ,
13503                                             NULL, SCTP_SO_LOCKED);
13504                                         /*
13505                                          * now relock the stcb so everything
13506                                          * is sane
13507                                          */
13508                                         hold_tcblock = 0;
13509                                         stcb = NULL;
13510                                         goto out;
13511                                 }
13512                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13513                                     asoc->primary_destination);
13514                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13515                         }
13516                 }
13517         }
13518 skip_out_eof:
13519         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13520                 some_on_control = 1;
13521         }
13522         if ((net->flight_size > net->cwnd) &&
13523             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13524                 queue_only = 1;
13525         } else if (asoc->ifp_had_enobuf) {
13526                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13527                 if (net->flight_size > (net->mtu * 2)) {
13528                         queue_only = 1;
13529                 } else {
13530                         queue_only = 0;
13531                 }
13532                 asoc->ifp_had_enobuf = 0;
13533                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13534                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13535         } else {
13536                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13537                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13538                 if (net->flight_size > net->cwnd) {
13539                         queue_only = 1;
13540                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13541                 } else {
13542                         queue_only = 0;
13543                 }
13544         }
13545         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13546             (stcb->asoc.total_flight > 0) &&
13547             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13548             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13549                 /*-
13550                  * Ok, Nagle is set on and we have data outstanding.
13551                  * Don't send anything and let SACKs drive out the
13552                  * data unless wen have a "full" segment to send.
13553                  */
13554                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13555                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13556                 }
13557                 SCTP_STAT_INCR(sctps_naglequeued);
13558                 nagle_applies = 1;
13559         } else {
13560                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13561                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13562                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13563                 }
13564                 SCTP_STAT_INCR(sctps_naglesent);
13565                 nagle_applies = 0;
13566         }
13567         if (queue_only_for_init) {
13568                 if (hold_tcblock == 0) {
13569                         SCTP_TCB_LOCK(stcb);
13570                         hold_tcblock = 1;
13571                 }
13572                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13573                         /* a collision took us forward? */
13574                         queue_only_for_init = 0;
13575                         queue_only = 0;
13576                 } else {
13577                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13578                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13579                         queue_only_for_init = 0;
13580                         queue_only = 1;
13581                 }
13582         }
13583         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13584                 /* we can attempt to send too. */
13585                 if (hold_tcblock == 0) {
13586                         /*
13587                          * If there is activity recv'ing sacks no need to
13588                          * send
13589                          */
13590                         if (SCTP_TCB_TRYLOCK(stcb)) {
13591                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13592                                 hold_tcblock = 1;
13593                         }
13594                 } else {
13595                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13596                 }
13597         } else if ((queue_only == 0) &&
13598                     (stcb->asoc.peers_rwnd == 0) &&
13599             (stcb->asoc.total_flight == 0)) {
13600                 /* We get to have a probe outstanding */
13601                 if (hold_tcblock == 0) {
13602                         hold_tcblock = 1;
13603                         SCTP_TCB_LOCK(stcb);
13604                 }
13605                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13606         } else if (some_on_control) {
13607                 int num_out, reason, frag_point;
13608
13609                 /* Here we do control only */
13610                 if (hold_tcblock == 0) {
13611                         hold_tcblock = 1;
13612                         SCTP_TCB_LOCK(stcb);
13613                 }
13614                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13615                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13616                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13617         }
13618         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13619             queue_only, stcb->asoc.peers_rwnd, un_sent,
13620             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13621             stcb->asoc.total_output_queue_size, error);
13622
13623 out:
13624 out_unlocked:
13625
13626         if (local_soresv && stcb) {
13627                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13628                 local_soresv = 0;
13629         }
13630         if (create_lock_applied) {
13631                 SCTP_ASOC_CREATE_UNLOCK(inp);
13632                 create_lock_applied = 0;
13633         }
13634         if ((stcb) && hold_tcblock) {
13635                 SCTP_TCB_UNLOCK(stcb);
13636         }
13637         if (stcb && free_cnt_applied) {
13638                 atomic_add_int(&stcb->asoc.refcnt, -1);
13639         }
13640 #ifdef INVARIANTS
13641         if (stcb) {
13642                 if (mtx_owned(&stcb->tcb_mtx)) {
13643                         panic("Leaving with tcb mtx owned?");
13644                 }
13645                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13646                         panic("Leaving with tcb send mtx owned?");
13647                 }
13648         }
13649 #endif
13650         if (top) {
13651                 sctp_m_freem(top);
13652         }
13653         if (control) {
13654                 sctp_m_freem(control);
13655         }
13656         return (error);
13657 }
13658
13659
13660 /*
13661  * generate an AUTHentication chunk, if required
13662  */
13663 struct mbuf *
13664 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13665     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13666     struct sctp_tcb *stcb, uint8_t chunk)
13667 {
13668         struct mbuf *m_auth;
13669         struct sctp_auth_chunk *auth;
13670         int chunk_len;
13671
13672         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13673             (stcb == NULL))
13674                 return (m);
13675
13676         /* sysctl disabled auth? */
13677         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13678                 return (m);
13679
13680         /* peer doesn't do auth... */
13681         if (!stcb->asoc.peer_supports_auth) {
13682                 return (m);
13683         }
13684         /* does the requested chunk require auth? */
13685         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13686                 return (m);
13687         }
13688         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13689         if (m_auth == NULL) {
13690                 /* no mbuf's */
13691                 return (m);
13692         }
13693         /* reserve some space if this will be the first mbuf */
13694         if (m == NULL)
13695                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13696         /* fill in the AUTH chunk details */
13697         auth = mtod(m_auth, struct sctp_auth_chunk *);
13698         bzero(auth, sizeof(*auth));
13699         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13700         auth->ch.chunk_flags = 0;
13701         chunk_len = sizeof(*auth) +
13702             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13703         auth->ch.chunk_length = htons(chunk_len);
13704         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13705         /* key id and hmac digest will be computed and filled in upon send */
13706
13707         /* save the offset where the auth was inserted into the chain */
13708         if (m != NULL) {
13709                 struct mbuf *cn;
13710
13711                 *offset = 0;
13712                 cn = m;
13713                 while (cn) {
13714                         *offset += SCTP_BUF_LEN(cn);
13715                         cn = SCTP_BUF_NEXT(cn);
13716                 }
13717         } else
13718                 *offset = 0;
13719
13720         /* update length and return pointer to the auth chunk */
13721         SCTP_BUF_LEN(m_auth) = chunk_len;
13722         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13723         if (auth_ret != NULL)
13724                 *auth_ret = auth;
13725
13726         return (m);
13727 }
13728
13729 #ifdef INET6
13730 int
13731 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13732 {
13733         struct nd_prefix *pfx = NULL;
13734         struct nd_pfxrouter *pfxrtr = NULL;
13735         struct sockaddr_in6 gw6;
13736
13737         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13738                 return (0);
13739
13740         /* get prefix entry of address */
13741         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13742                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13743                         continue;
13744                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13745                     &src6->sin6_addr, &pfx->ndpr_mask))
13746                         break;
13747         }
13748         /* no prefix entry in the prefix list */
13749         if (pfx == NULL) {
13750                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13751                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13752                 return (0);
13753         }
13754         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13755         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13756
13757         /* search installed gateway from prefix entry */
13758         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13759             pfxrtr->pfr_next) {
13760                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13761                 gw6.sin6_family = AF_INET6;
13762                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13763                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13764                     sizeof(struct in6_addr));
13765                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13766                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13767                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13768                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13769                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13770                     ro->ro_rt->rt_gateway)) {
13771                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13772                         return (1);
13773                 }
13774         }
13775         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13776         return (0);
13777 }
13778
13779 #endif
13780
13781 int
13782 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13783 {
13784         struct sockaddr_in *sin, *mask;
13785         struct ifaddr *ifa;
13786         struct in_addr srcnetaddr, gwnetaddr;
13787
13788         if (ro == NULL || ro->ro_rt == NULL ||
13789             sifa->address.sa.sa_family != AF_INET) {
13790                 return (0);
13791         }
13792         ifa = (struct ifaddr *)sifa->ifa;
13793         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13794         sin = (struct sockaddr_in *)&sifa->address.sin;
13795         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13796         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13797         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13798         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13799
13800         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13801         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13802         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13803         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13804         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13805         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13806                 return (1);
13807         }
13808         return (0);
13809 }