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(MOD_INET6, 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(MOD_INET6, 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(MOD_INET6, 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(MOD_INET6, 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(MOD_INET6, 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         struct sctp_stream_out *stre, *strn;
5606
5607         if (holds_lock == 0) {
5608                 SCTP_TCB_SEND_LOCK(stcb);
5609         }
5610         if ((strq->next_spoke.tqe_next) ||
5611             (strq->next_spoke.tqe_prev)) {
5612                 /* already on wheel */
5613                 goto outof_here;
5614         }
5615         stre = TAILQ_FIRST(&asoc->out_wheel);
5616         if (stre == NULL) {
5617                 /* only one on wheel */
5618                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5619                 goto outof_here;
5620         }
5621         for (; stre; stre = strn) {
5622                 strn = TAILQ_NEXT(stre, next_spoke);
5623                 if (stre->stream_no > strq->stream_no) {
5624                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5625                         goto outof_here;
5626                 } else if (stre->stream_no == strq->stream_no) {
5627                         /* huh, should not happen */
5628                         goto outof_here;
5629                 } else if (strn == NULL) {
5630                         /* next one is null */
5631                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5632                             next_spoke);
5633                 }
5634         }
5635 outof_here:
5636         if (holds_lock == 0) {
5637                 SCTP_TCB_SEND_UNLOCK(stcb);
5638         }
5639 }
5640
5641 void
5642 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5643     struct sctp_association *asoc,
5644     struct sctp_stream_out *strq,
5645     int holds_lock)
5646 {
5647         /* take off and then setup so we know it is not on the wheel */
5648         if (holds_lock == 0)
5649                 SCTP_TCB_SEND_LOCK(stcb);
5650         if (TAILQ_FIRST(&strq->outqueue)) {
5651                 /* more was added */
5652                 if (holds_lock == 0)
5653                         SCTP_TCB_SEND_UNLOCK(stcb);
5654                 return;
5655         }
5656         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5657         strq->next_spoke.tqe_next = NULL;
5658         strq->next_spoke.tqe_prev = NULL;
5659         if (holds_lock == 0)
5660                 SCTP_TCB_SEND_UNLOCK(stcb);
5661 }
5662
5663 static void
5664 sctp_prune_prsctp(struct sctp_tcb *stcb,
5665     struct sctp_association *asoc,
5666     struct sctp_sndrcvinfo *srcv,
5667     int dataout)
5668 {
5669         int freed_spc = 0;
5670         struct sctp_tmit_chunk *chk, *nchk;
5671
5672         SCTP_TCB_LOCK_ASSERT(stcb);
5673         if ((asoc->peer_supports_prsctp) &&
5674             (asoc->sent_queue_cnt_removeable > 0)) {
5675                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5676                         /*
5677                          * Look for chunks marked with the PR_SCTP flag AND
5678                          * the buffer space flag. If the one being sent is
5679                          * equal or greater priority then purge the old one
5680                          * and free some space.
5681                          */
5682                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5683                                 /*
5684                                  * This one is PR-SCTP AND buffer space
5685                                  * limited type
5686                                  */
5687                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5688                                         /*
5689                                          * Lower numbers equates to higher
5690                                          * priority so if the one we are
5691                                          * looking at has a larger or equal
5692                                          * priority we want to drop the data
5693                                          * and NOT retransmit it.
5694                                          */
5695                                         if (chk->data) {
5696                                                 /*
5697                                                  * We release the book_size
5698                                                  * if the mbuf is here
5699                                                  */
5700                                                 int ret_spc;
5701                                                 int cause;
5702
5703                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5704                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5705                                                 else
5706                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5707                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5708                                                     cause,
5709                                                     SCTP_SO_LOCKED);
5710                                                 freed_spc += ret_spc;
5711                                                 if (freed_spc >= dataout) {
5712                                                         return;
5713                                                 }
5714                                         }       /* if chunk was present */
5715                                 }       /* if of sufficent priority */
5716                         }       /* if chunk has enabled */
5717                 }               /* tailqforeach */
5718
5719                 chk = TAILQ_FIRST(&asoc->send_queue);
5720                 while (chk) {
5721                         nchk = TAILQ_NEXT(chk, sctp_next);
5722                         /* Here we must move to the sent queue and mark */
5723                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5724                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5725                                         if (chk->data) {
5726                                                 /*
5727                                                  * We release the book_size
5728                                                  * if the mbuf is here
5729                                                  */
5730                                                 int ret_spc;
5731
5732                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5733                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5734                                                     SCTP_SO_LOCKED);
5735
5736                                                 freed_spc += ret_spc;
5737                                                 if (freed_spc >= dataout) {
5738                                                         return;
5739                                                 }
5740                                         }       /* end if chk->data */
5741                                 }       /* end if right class */
5742                         }       /* end if chk pr-sctp */
5743                         chk = nchk;
5744                 }               /* end while (chk) */
5745         }                       /* if enabled in asoc */
5746 }
5747
5748 int
5749 sctp_get_frag_point(struct sctp_tcb *stcb,
5750     struct sctp_association *asoc)
5751 {
5752         int siz, ovh;
5753
5754         /*
5755          * For endpoints that have both v6 and v4 addresses we must reserve
5756          * room for the ipv6 header, for those that are only dealing with V4
5757          * we use a larger frag point.
5758          */
5759         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5760                 ovh = SCTP_MED_OVERHEAD;
5761         } else {
5762                 ovh = SCTP_MED_V4_OVERHEAD;
5763         }
5764
5765         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5766                 siz = asoc->smallest_mtu - ovh;
5767         else
5768                 siz = (stcb->asoc.sctp_frag_point - ovh);
5769         /*
5770          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5771          */
5772         /* A data chunk MUST fit in a cluster */
5773         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5774         /* } */
5775
5776         /* adjust for an AUTH chunk if DATA requires auth */
5777         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5778                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5779
5780         if (siz % 4) {
5781                 /* make it an even word boundary please */
5782                 siz -= (siz % 4);
5783         }
5784         return (siz);
5785 }
5786
5787 static void
5788 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5789 {
5790         sp->pr_sctp_on = 0;
5791         /*
5792          * We assume that the user wants PR_SCTP_TTL if the user provides a
5793          * positive lifetime but does not specify any PR_SCTP policy. This
5794          * is a BAD assumption and causes problems at least with the
5795          * U-Vancovers MPI folks. I will change this to be no policy means
5796          * NO PR-SCTP.
5797          */
5798         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5799                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5800                 sp->pr_sctp_on = 1;
5801         } else {
5802                 return;
5803         }
5804         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5805         case CHUNK_FLAGS_PR_SCTP_BUF:
5806                 /*
5807                  * Time to live is a priority stored in tv_sec when doing
5808                  * the buffer drop thing.
5809                  */
5810                 sp->ts.tv_sec = sp->timetolive;
5811                 sp->ts.tv_usec = 0;
5812                 break;
5813         case CHUNK_FLAGS_PR_SCTP_TTL:
5814                 {
5815                         struct timeval tv;
5816
5817                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5818                         tv.tv_sec = sp->timetolive / 1000;
5819                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5820                         /*
5821                          * TODO sctp_constants.h needs alternative time
5822                          * macros when _KERNEL is undefined.
5823                          */
5824                         timevaladd(&sp->ts, &tv);
5825                 }
5826                 break;
5827         case CHUNK_FLAGS_PR_SCTP_RTX:
5828                 /*
5829                  * Time to live is a the number or retransmissions stored in
5830                  * tv_sec.
5831                  */
5832                 sp->ts.tv_sec = sp->timetolive;
5833                 sp->ts.tv_usec = 0;
5834                 break;
5835         default:
5836                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5837                     "Unknown PR_SCTP policy %u.\n",
5838                     PR_SCTP_POLICY(sp->sinfo_flags));
5839                 break;
5840         }
5841 }
5842
5843 static int
5844 sctp_msg_append(struct sctp_tcb *stcb,
5845     struct sctp_nets *net,
5846     struct mbuf *m,
5847     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5848 {
5849         int error = 0, holds_lock;
5850         struct mbuf *at;
5851         struct sctp_stream_queue_pending *sp = NULL;
5852         struct sctp_stream_out *strm;
5853
5854         /*
5855          * Given an mbuf chain, put it into the association send queue and
5856          * place it on the wheel
5857          */
5858         holds_lock = hold_stcb_lock;
5859         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5860                 /* Invalid stream number */
5861                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5862                 error = EINVAL;
5863                 goto out_now;
5864         }
5865         if ((stcb->asoc.stream_locked) &&
5866             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5867                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5868                 error = EINVAL;
5869                 goto out_now;
5870         }
5871         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5872         /* Now can we send this? */
5873         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5874             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5875             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5876             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5877                 /* got data while shutting down */
5878                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5879                 error = ECONNRESET;
5880                 goto out_now;
5881         }
5882         sctp_alloc_a_strmoq(stcb, sp);
5883         if (sp == NULL) {
5884                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5885                 error = ENOMEM;
5886                 goto out_now;
5887         }
5888         sp->sinfo_flags = srcv->sinfo_flags;
5889         sp->timetolive = srcv->sinfo_timetolive;
5890         sp->ppid = srcv->sinfo_ppid;
5891         sp->context = srcv->sinfo_context;
5892         sp->strseq = 0;
5893         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5894                 sp->net = net;
5895                 sp->addr_over = 1;
5896         } else {
5897                 sp->net = stcb->asoc.primary_destination;
5898                 sp->addr_over = 0;
5899         }
5900         atomic_add_int(&sp->net->ref_count, 1);
5901         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5902         sp->stream = srcv->sinfo_stream;
5903         sp->msg_is_complete = 1;
5904         sp->sender_all_done = 1;
5905         sp->some_taken = 0;
5906         sp->data = m;
5907         sp->tail_mbuf = NULL;
5908         sp->length = 0;
5909         at = m;
5910         sctp_set_prsctp_policy(sp);
5911         /*
5912          * We could in theory (for sendall) sifa the length in, but we would
5913          * still have to hunt through the chain since we need to setup the
5914          * tail_mbuf
5915          */
5916         while (at) {
5917                 if (SCTP_BUF_NEXT(at) == NULL)
5918                         sp->tail_mbuf = at;
5919                 sp->length += SCTP_BUF_LEN(at);
5920                 at = SCTP_BUF_NEXT(at);
5921         }
5922         SCTP_TCB_SEND_LOCK(stcb);
5923         sctp_snd_sb_alloc(stcb, sp->length);
5924         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5925         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5926         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5927                 sp->strseq = strm->next_sequence_sent;
5928                 strm->next_sequence_sent++;
5929         }
5930         if ((strm->next_spoke.tqe_next == NULL) &&
5931             (strm->next_spoke.tqe_prev == NULL)) {
5932                 /* Not on wheel, insert */
5933                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5934         }
5935         m = NULL;
5936         SCTP_TCB_SEND_UNLOCK(stcb);
5937 out_now:
5938         if (m) {
5939                 sctp_m_freem(m);
5940         }
5941         return (error);
5942 }
5943
5944
5945 static struct mbuf *
5946 sctp_copy_mbufchain(struct mbuf *clonechain,
5947     struct mbuf *outchain,
5948     struct mbuf **endofchain,
5949     int can_take_mbuf,
5950     int sizeofcpy,
5951     uint8_t copy_by_ref)
5952 {
5953         struct mbuf *m;
5954         struct mbuf *appendchain;
5955         caddr_t cp;
5956         int len;
5957
5958         if (endofchain == NULL) {
5959                 /* error */
5960 error_out:
5961                 if (outchain)
5962                         sctp_m_freem(outchain);
5963                 return (NULL);
5964         }
5965         if (can_take_mbuf) {
5966                 appendchain = clonechain;
5967         } else {
5968                 if (!copy_by_ref &&
5969                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5970                     ) {
5971                         /* Its not in a cluster */
5972                         if (*endofchain == NULL) {
5973                                 /* lets get a mbuf cluster */
5974                                 if (outchain == NULL) {
5975                                         /* This is the general case */
5976                         new_mbuf:
5977                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5978                                         if (outchain == NULL) {
5979                                                 goto error_out;
5980                                         }
5981                                         SCTP_BUF_LEN(outchain) = 0;
5982                                         *endofchain = outchain;
5983                                         /* get the prepend space */
5984                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5985                                 } else {
5986                                         /*
5987                                          * We really should not get a NULL
5988                                          * in endofchain
5989                                          */
5990                                         /* find end */
5991                                         m = outchain;
5992                                         while (m) {
5993                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5994                                                         *endofchain = m;
5995                                                         break;
5996                                                 }
5997                                                 m = SCTP_BUF_NEXT(m);
5998                                         }
5999                                         /* sanity */
6000                                         if (*endofchain == NULL) {
6001                                                 /*
6002                                                  * huh, TSNH XXX maybe we
6003                                                  * should panic
6004                                                  */
6005                                                 sctp_m_freem(outchain);
6006                                                 goto new_mbuf;
6007                                         }
6008                                 }
6009                                 /* get the new end of length */
6010                                 len = M_TRAILINGSPACE(*endofchain);
6011                         } else {
6012                                 /* how much is left at the end? */
6013                                 len = M_TRAILINGSPACE(*endofchain);
6014                         }
6015                         /* Find the end of the data, for appending */
6016                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6017
6018                         /* Now lets copy it out */
6019                         if (len >= sizeofcpy) {
6020                                 /* It all fits, copy it in */
6021                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6022                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6023                         } else {
6024                                 /* fill up the end of the chain */
6025                                 if (len > 0) {
6026                                         m_copydata(clonechain, 0, len, cp);
6027                                         SCTP_BUF_LEN((*endofchain)) += len;
6028                                         /* now we need another one */
6029                                         sizeofcpy -= len;
6030                                 }
6031                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6032                                 if (m == NULL) {
6033                                         /* We failed */
6034                                         goto error_out;
6035                                 }
6036                                 SCTP_BUF_NEXT((*endofchain)) = m;
6037                                 *endofchain = m;
6038                                 cp = mtod((*endofchain), caddr_t);
6039                                 m_copydata(clonechain, len, sizeofcpy, cp);
6040                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6041                         }
6042                         return (outchain);
6043                 } else {
6044                         /* copy the old fashion way */
6045                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6046 #ifdef SCTP_MBUF_LOGGING
6047                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6048                                 struct mbuf *mat;
6049
6050                                 mat = appendchain;
6051                                 while (mat) {
6052                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6053                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6054                                         }
6055                                         mat = SCTP_BUF_NEXT(mat);
6056                                 }
6057                         }
6058 #endif
6059                 }
6060         }
6061         if (appendchain == NULL) {
6062                 /* error */
6063                 if (outchain)
6064                         sctp_m_freem(outchain);
6065                 return (NULL);
6066         }
6067         if (outchain) {
6068                 /* tack on to the end */
6069                 if (*endofchain != NULL) {
6070                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6071                 } else {
6072                         m = outchain;
6073                         while (m) {
6074                                 if (SCTP_BUF_NEXT(m) == NULL) {
6075                                         SCTP_BUF_NEXT(m) = appendchain;
6076                                         break;
6077                                 }
6078                                 m = SCTP_BUF_NEXT(m);
6079                         }
6080                 }
6081                 /*
6082                  * save off the end and update the end-chain postion
6083                  */
6084                 m = appendchain;
6085                 while (m) {
6086                         if (SCTP_BUF_NEXT(m) == NULL) {
6087                                 *endofchain = m;
6088                                 break;
6089                         }
6090                         m = SCTP_BUF_NEXT(m);
6091                 }
6092                 return (outchain);
6093         } else {
6094                 /* save off the end and update the end-chain postion */
6095                 m = appendchain;
6096                 while (m) {
6097                         if (SCTP_BUF_NEXT(m) == NULL) {
6098                                 *endofchain = m;
6099                                 break;
6100                         }
6101                         m = SCTP_BUF_NEXT(m);
6102                 }
6103                 return (appendchain);
6104         }
6105 }
6106
6107 int
6108 sctp_med_chunk_output(struct sctp_inpcb *inp,
6109     struct sctp_tcb *stcb,
6110     struct sctp_association *asoc,
6111     int *num_out,
6112     int *reason_code,
6113     int control_only, int from_where,
6114     struct timeval *now, int *now_filled, int frag_point, int so_locked
6115 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6116     SCTP_UNUSED
6117 #endif
6118 );
6119
6120 static void
6121 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6122     uint32_t val)
6123 {
6124         struct sctp_copy_all *ca;
6125         struct mbuf *m;
6126         int ret = 0;
6127         int added_control = 0;
6128         int un_sent, do_chunk_output = 1;
6129         struct sctp_association *asoc;
6130
6131         ca = (struct sctp_copy_all *)ptr;
6132         if (ca->m == NULL) {
6133                 return;
6134         }
6135         if (ca->inp != inp) {
6136                 /* TSNH */
6137                 return;
6138         }
6139         if ((ca->m) && ca->sndlen) {
6140                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6141                 if (m == NULL) {
6142                         /* can't copy so we are done */
6143                         ca->cnt_failed++;
6144                         return;
6145                 }
6146 #ifdef SCTP_MBUF_LOGGING
6147                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6148                         struct mbuf *mat;
6149
6150                         mat = m;
6151                         while (mat) {
6152                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6153                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6154                                 }
6155                                 mat = SCTP_BUF_NEXT(mat);
6156                         }
6157                 }
6158 #endif
6159         } else {
6160                 m = NULL;
6161         }
6162         SCTP_TCB_LOCK_ASSERT(stcb);
6163         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6164                 /* Abort this assoc with m as the user defined reason */
6165                 if (m) {
6166                         struct sctp_paramhdr *ph;
6167
6168                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6169                         if (m) {
6170                                 ph = mtod(m, struct sctp_paramhdr *);
6171                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6172                                 ph->param_length = htons(ca->sndlen);
6173                         }
6174                         /*
6175                          * We add one here to keep the assoc from
6176                          * dis-appearing on us.
6177                          */
6178                         atomic_add_int(&stcb->asoc.refcnt, 1);
6179                         sctp_abort_an_association(inp, stcb,
6180                             SCTP_RESPONSE_TO_USER_REQ,
6181                             m, SCTP_SO_NOT_LOCKED);
6182                         /*
6183                          * sctp_abort_an_association calls sctp_free_asoc()
6184                          * free association will NOT free it since we
6185                          * incremented the refcnt .. we do this to prevent
6186                          * it being freed and things getting tricky since we
6187                          * could end up (from free_asoc) calling inpcb_free
6188                          * which would get a recursive lock call to the
6189                          * iterator lock.. But as a consequence of that the
6190                          * stcb will return to us un-locked.. since
6191                          * free_asoc returns with either no TCB or the TCB
6192                          * unlocked, we must relock.. to unlock in the
6193                          * iterator timer :-0
6194                          */
6195                         SCTP_TCB_LOCK(stcb);
6196                         atomic_add_int(&stcb->asoc.refcnt, -1);
6197                         goto no_chunk_output;
6198                 }
6199         } else {
6200                 if (m) {
6201                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6202                             &ca->sndrcv, 1);
6203                 }
6204                 asoc = &stcb->asoc;
6205                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6206                         /* shutdown this assoc */
6207                         int cnt;
6208
6209                         cnt = sctp_is_there_unsent_data(stcb);
6210
6211                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6212                             TAILQ_EMPTY(&asoc->sent_queue) &&
6213                             (cnt == 0)) {
6214                                 if (asoc->locked_on_sending) {
6215                                         goto abort_anyway;
6216                                 }
6217                                 /*
6218                                  * there is nothing queued to send, so I'm
6219                                  * done...
6220                                  */
6221                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6222                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6223                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6224                                         /*
6225                                          * only send SHUTDOWN the first time
6226                                          * through
6227                                          */
6228                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6229                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6230                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6231                                         }
6232                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6233                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6234                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6235                                             asoc->primary_destination);
6236                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6237                                             asoc->primary_destination);
6238                                         added_control = 1;
6239                                         do_chunk_output = 0;
6240                                 }
6241                         } else {
6242                                 /*
6243                                  * we still got (or just got) data to send,
6244                                  * so set SHUTDOWN_PENDING
6245                                  */
6246                                 /*
6247                                  * XXX sockets draft says that SCTP_EOF
6248                                  * should be sent with no data.  currently,
6249                                  * we will allow user data to be sent first
6250                                  * and move to SHUTDOWN-PENDING
6251                                  */
6252                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6253                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6254                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6255                                         if (asoc->locked_on_sending) {
6256                                                 /*
6257                                                  * Locked to send out the
6258                                                  * data
6259                                                  */
6260                                                 struct sctp_stream_queue_pending *sp;
6261
6262                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6263                                                 if (sp) {
6264                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6265                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6266                                                 }
6267                                         }
6268                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6269                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6270                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6271                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6272                                 abort_anyway:
6273                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6274                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6275                                                     SCTP_RESPONSE_TO_USER_REQ,
6276                                                     NULL, SCTP_SO_NOT_LOCKED);
6277                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6278                                                 goto no_chunk_output;
6279                                         }
6280                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6281                                             asoc->primary_destination);
6282                                 }
6283                         }
6284
6285                 }
6286         }
6287         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6288             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6289
6290         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6291             (stcb->asoc.total_flight > 0) &&
6292             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6293             ) {
6294                 do_chunk_output = 0;
6295         }
6296         if (do_chunk_output)
6297                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6298         else if (added_control) {
6299                 int num_out = 0, reason = 0, now_filled = 0;
6300                 struct timeval now;
6301                 int frag_point;
6302
6303                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6304                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6305                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6306         }
6307 no_chunk_output:
6308         if (ret) {
6309                 ca->cnt_failed++;
6310         } else {
6311                 ca->cnt_sent++;
6312         }
6313 }
6314
6315 static void
6316 sctp_sendall_completes(void *ptr, uint32_t val)
6317 {
6318         struct sctp_copy_all *ca;
6319
6320         ca = (struct sctp_copy_all *)ptr;
6321         /*
6322          * Do a notify here? Kacheong suggests that the notify be done at
6323          * the send time.. so you would push up a notification if any send
6324          * failed. Don't know if this is feasable since the only failures we
6325          * have is "memory" related and if you cannot get an mbuf to send
6326          * the data you surely can't get an mbuf to send up to notify the
6327          * user you can't send the data :->
6328          */
6329
6330         /* now free everything */
6331         sctp_m_freem(ca->m);
6332         SCTP_FREE(ca, SCTP_M_COPYAL);
6333 }
6334
6335
6336 #define MC_ALIGN(m, len) do {                                           \
6337         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6338 } while (0)
6339
6340
6341
6342 static struct mbuf *
6343 sctp_copy_out_all(struct uio *uio, int len)
6344 {
6345         struct mbuf *ret, *at;
6346         int left, willcpy, cancpy, error;
6347
6348         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6349         if (ret == NULL) {
6350                 /* TSNH */
6351                 return (NULL);
6352         }
6353         left = len;
6354         SCTP_BUF_LEN(ret) = 0;
6355         /* save space for the data chunk header */
6356         cancpy = M_TRAILINGSPACE(ret);
6357         willcpy = min(cancpy, left);
6358         at = ret;
6359         while (left > 0) {
6360                 /* Align data to the end */
6361                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6362                 if (error) {
6363         err_out_now:
6364                         sctp_m_freem(at);
6365                         return (NULL);
6366                 }
6367                 SCTP_BUF_LEN(at) = willcpy;
6368                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6369                 left -= willcpy;
6370                 if (left > 0) {
6371                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6372                         if (SCTP_BUF_NEXT(at) == NULL) {
6373                                 goto err_out_now;
6374                         }
6375                         at = SCTP_BUF_NEXT(at);
6376                         SCTP_BUF_LEN(at) = 0;
6377                         cancpy = M_TRAILINGSPACE(at);
6378                         willcpy = min(cancpy, left);
6379                 }
6380         }
6381         return (ret);
6382 }
6383
6384 static int
6385 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6386     struct sctp_sndrcvinfo *srcv)
6387 {
6388         int ret;
6389         struct sctp_copy_all *ca;
6390
6391         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6392             SCTP_M_COPYAL);
6393         if (ca == NULL) {
6394                 sctp_m_freem(m);
6395                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6396                 return (ENOMEM);
6397         }
6398         memset(ca, 0, sizeof(struct sctp_copy_all));
6399
6400         ca->inp = inp;
6401         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6402         /*
6403          * take off the sendall flag, it would be bad if we failed to do
6404          * this :-0
6405          */
6406         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6407         /* get length and mbuf chain */
6408         if (uio) {
6409                 ca->sndlen = uio->uio_resid;
6410                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6411                 if (ca->m == NULL) {
6412                         SCTP_FREE(ca, SCTP_M_COPYAL);
6413                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6414                         return (ENOMEM);
6415                 }
6416         } else {
6417                 /* Gather the length of the send */
6418                 struct mbuf *mat;
6419
6420                 mat = m;
6421                 ca->sndlen = 0;
6422                 while (m) {
6423                         ca->sndlen += SCTP_BUF_LEN(m);
6424                         m = SCTP_BUF_NEXT(m);
6425                 }
6426                 ca->m = mat;
6427         }
6428         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6429             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6430             SCTP_ASOC_ANY_STATE,
6431             (void *)ca, 0,
6432             sctp_sendall_completes, inp, 1);
6433         if (ret) {
6434                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6435                 SCTP_FREE(ca, SCTP_M_COPYAL);
6436                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6437                 return (EFAULT);
6438         }
6439         return (0);
6440 }
6441
6442
6443 void
6444 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6445 {
6446         struct sctp_tmit_chunk *chk, *nchk;
6447
6448         chk = TAILQ_FIRST(&asoc->control_send_queue);
6449         while (chk) {
6450                 nchk = TAILQ_NEXT(chk, sctp_next);
6451                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6452                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6453                         if (chk->data) {
6454                                 sctp_m_freem(chk->data);
6455                                 chk->data = NULL;
6456                         }
6457                         asoc->ctrl_queue_cnt--;
6458                         sctp_free_a_chunk(stcb, chk);
6459                 }
6460                 chk = nchk;
6461         }
6462 }
6463
6464 void
6465 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6466 {
6467         struct sctp_association *asoc;
6468         struct sctp_tmit_chunk *chk, *chk_tmp;
6469         struct sctp_asconf_chunk *acp;
6470
6471         asoc = &stcb->asoc;
6472         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6473             chk = chk_tmp) {
6474                 /* get next chk */
6475                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6476                 /* find SCTP_ASCONF chunk in queue */
6477                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6478                         if (chk->data) {
6479                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6480                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6481                                         /* Not Acked yet */
6482                                         break;
6483                                 }
6484                         }
6485                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6486                         if (chk->data) {
6487                                 sctp_m_freem(chk->data);
6488                                 chk->data = NULL;
6489                         }
6490                         asoc->ctrl_queue_cnt--;
6491                         sctp_free_a_chunk(stcb, chk);
6492                 }
6493         }
6494 }
6495
6496
6497 static void
6498 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6499
6500     struct sctp_association *asoc,
6501     struct sctp_tmit_chunk **data_list,
6502     int bundle_at,
6503     struct sctp_nets *net)
6504 {
6505         int i;
6506         struct sctp_tmit_chunk *tp1;
6507
6508         for (i = 0; i < bundle_at; i++) {
6509                 /* off of the send queue */
6510                 if (i) {
6511                         /*
6512                          * Any chunk NOT 0 you zap the time chunk 0 gets
6513                          * zapped or set based on if a RTO measurment is
6514                          * needed.
6515                          */
6516                         data_list[i]->do_rtt = 0;
6517                 }
6518                 /* record time */
6519                 data_list[i]->sent_rcv_time = net->last_sent_time;
6520                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6521                 TAILQ_REMOVE(&asoc->send_queue,
6522                     data_list[i],
6523                     sctp_next);
6524                 /* on to the sent queue */
6525                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6526                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6527                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6528                         struct sctp_tmit_chunk *tpp;
6529
6530                         /* need to move back */
6531         back_up_more:
6532                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6533                         if (tpp == NULL) {
6534                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6535                                 goto all_done;
6536                         }
6537                         tp1 = tpp;
6538                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6539                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6540                                 goto back_up_more;
6541                         }
6542                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6543                 } else {
6544                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6545                             data_list[i],
6546                             sctp_next);
6547                 }
6548 all_done:
6549                 /* This does not lower until the cum-ack passes it */
6550                 asoc->sent_queue_cnt++;
6551                 asoc->send_queue_cnt--;
6552                 if ((asoc->peers_rwnd <= 0) &&
6553                     (asoc->total_flight == 0) &&
6554                     (bundle_at == 1)) {
6555                         /* Mark the chunk as being a window probe */
6556                         SCTP_STAT_INCR(sctps_windowprobed);
6557                 }
6558 #ifdef SCTP_AUDITING_ENABLED
6559                 sctp_audit_log(0xC2, 3);
6560 #endif
6561                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6562                 data_list[i]->snd_count = 1;
6563                 data_list[i]->rec.data.chunk_was_revoked = 0;
6564                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6565                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6566                             data_list[i]->whoTo->flight_size,
6567                             data_list[i]->book_size,
6568                             (uintptr_t) data_list[i]->whoTo,
6569                             data_list[i]->rec.data.TSN_seq);
6570                 }
6571                 sctp_flight_size_increase(data_list[i]);
6572                 sctp_total_flight_increase(stcb, data_list[i]);
6573                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6574                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6575                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6576                 }
6577                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6578                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6579                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6580                         /* SWS sender side engages */
6581                         asoc->peers_rwnd = 0;
6582                 }
6583         }
6584 }
6585
6586 static void
6587 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6588 {
6589         struct sctp_tmit_chunk *chk, *nchk;
6590
6591         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6592             chk; chk = nchk) {
6593                 nchk = TAILQ_NEXT(chk, sctp_next);
6594                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6595                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6596                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6597                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6598                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6599                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6600                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6601                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6602                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6603                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6604                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6605                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6606                         /* Stray chunks must be cleaned up */
6607         clean_up_anyway:
6608                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6609                         if (chk->data) {
6610                                 sctp_m_freem(chk->data);
6611                                 chk->data = NULL;
6612                         }
6613                         asoc->ctrl_queue_cnt--;
6614                         sctp_free_a_chunk(stcb, chk);
6615                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6616                         /* special handling, we must look into the param */
6617                         if (chk != asoc->str_reset) {
6618                                 goto clean_up_anyway;
6619                         }
6620                 }
6621         }
6622 }
6623
6624
6625 static int
6626 sctp_can_we_split_this(struct sctp_tcb *stcb,
6627     uint32_t length,
6628     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6629 {
6630         /*
6631          * Make a decision on if I should split a msg into multiple parts.
6632          * This is only asked of incomplete messages.
6633          */
6634         if (eeor_on) {
6635                 /*
6636                  * If we are doing EEOR we need to always send it if its the
6637                  * entire thing, since it might be all the guy is putting in
6638                  * the hopper.
6639                  */
6640                 if (goal_mtu >= length) {
6641                         /*-
6642                          * If we have data outstanding,
6643                          * we get another chance when the sack
6644                          * arrives to transmit - wait for more data
6645                          */
6646                         if (stcb->asoc.total_flight == 0) {
6647                                 /*
6648                                  * If nothing is in flight, we zero the
6649                                  * packet counter.
6650                                  */
6651                                 return (length);
6652                         }
6653                         return (0);
6654
6655                 } else {
6656                         /* You can fill the rest */
6657                         return (goal_mtu);
6658                 }
6659         }
6660         /*-
6661          * For those strange folk that make the send buffer
6662          * smaller than our fragmentation point, we can't
6663          * get a full msg in so we have to allow splitting.
6664          */
6665         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6666                 return (length);
6667         }
6668         if ((length <= goal_mtu) ||
6669             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6670                 /* Sub-optimial residual don't split in non-eeor mode. */
6671                 return (0);
6672         }
6673         /*
6674          * If we reach here length is larger than the goal_mtu. Do we wish
6675          * to split it for the sake of packet putting together?
6676          */
6677         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6678                 /* Its ok to split it */
6679                 return (min(goal_mtu, frag_point));
6680         }
6681         /* Nope, can't split */
6682         return (0);
6683
6684 }
6685
6686 static uint32_t
6687 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6688     struct sctp_stream_out *strq,
6689     uint32_t goal_mtu,
6690     uint32_t frag_point,
6691     int *locked,
6692     int *giveup,
6693     int eeor_mode,
6694     int *bail)
6695 {
6696         /* Move from the stream to the send_queue keeping track of the total */
6697         struct sctp_association *asoc;
6698         struct sctp_stream_queue_pending *sp;
6699         struct sctp_tmit_chunk *chk;
6700         struct sctp_data_chunk *dchkh;
6701         uint32_t to_move, length;
6702         uint8_t rcv_flags = 0;
6703         uint8_t some_taken;
6704         uint8_t send_lock_up = 0;
6705
6706         SCTP_TCB_LOCK_ASSERT(stcb);
6707         asoc = &stcb->asoc;
6708 one_more_time:
6709         /* sa_ignore FREED_MEMORY */
6710         sp = TAILQ_FIRST(&strq->outqueue);
6711         if (sp == NULL) {
6712                 *locked = 0;
6713                 if (send_lock_up == 0) {
6714                         SCTP_TCB_SEND_LOCK(stcb);
6715                         send_lock_up = 1;
6716                 }
6717                 sp = TAILQ_FIRST(&strq->outqueue);
6718                 if (sp) {
6719                         goto one_more_time;
6720                 }
6721                 if (strq->last_msg_incomplete) {
6722                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6723                             strq->stream_no,
6724                             strq->last_msg_incomplete);
6725                         strq->last_msg_incomplete = 0;
6726                 }
6727                 to_move = 0;
6728                 if (send_lock_up) {
6729                         SCTP_TCB_SEND_UNLOCK(stcb);
6730                         send_lock_up = 0;
6731                 }
6732                 goto out_of;
6733         }
6734         if ((sp->msg_is_complete) && (sp->length == 0)) {
6735                 if (sp->sender_all_done) {
6736                         /*
6737                          * We are doing differed cleanup. Last time through
6738                          * when we took all the data the sender_all_done was
6739                          * not set.
6740                          */
6741                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6742                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6743                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6744                                     sp->sender_all_done,
6745                                     sp->length,
6746                                     sp->msg_is_complete,
6747                                     sp->put_last_out,
6748                                     send_lock_up);
6749                         }
6750                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6751                                 SCTP_TCB_SEND_LOCK(stcb);
6752                                 send_lock_up = 1;
6753                         }
6754                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6755                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6756                         sctp_free_remote_addr(sp->net);
6757                         if (sp->data) {
6758                                 sctp_m_freem(sp->data);
6759                                 sp->data = NULL;
6760                         }
6761                         sctp_free_a_strmoq(stcb, sp);
6762                         /* we can't be locked to it */
6763                         *locked = 0;
6764                         stcb->asoc.locked_on_sending = NULL;
6765                         if (send_lock_up) {
6766                                 SCTP_TCB_SEND_UNLOCK(stcb);
6767                                 send_lock_up = 0;
6768                         }
6769                         /* back to get the next msg */
6770                         goto one_more_time;
6771                 } else {
6772                         /*
6773                          * sender just finished this but still holds a
6774                          * reference
6775                          */
6776                         *locked = 1;
6777                         *giveup = 1;
6778                         to_move = 0;
6779                         goto out_of;
6780                 }
6781         } else {
6782                 /* is there some to get */
6783                 if (sp->length == 0) {
6784                         /* no */
6785                         *locked = 1;
6786                         *giveup = 1;
6787                         to_move = 0;
6788                         goto out_of;
6789                 } else if (sp->discard_rest) {
6790                         if (send_lock_up == 0) {
6791                                 SCTP_TCB_SEND_LOCK(stcb);
6792                                 send_lock_up = 1;
6793                         }
6794                         /* Whack down the size */
6795                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6796                         if ((stcb->sctp_socket != NULL) && \
6797                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6798                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6799                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6800                         }
6801                         if (sp->data) {
6802                                 sctp_m_freem(sp->data);
6803                                 sp->data = NULL;
6804                                 sp->tail_mbuf = NULL;
6805                         }
6806                         sp->length = 0;
6807                         sp->some_taken = 1;
6808                         *locked = 1;
6809                         *giveup = 1;
6810                         to_move = 0;
6811                         goto out_of;
6812                 }
6813         }
6814         some_taken = sp->some_taken;
6815         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6816                 sp->msg_is_complete = 1;
6817         }
6818 re_look:
6819         length = sp->length;
6820         if (sp->msg_is_complete) {
6821                 /* The message is complete */
6822                 to_move = min(length, frag_point);
6823                 if (to_move == length) {
6824                         /* All of it fits in the MTU */
6825                         if (sp->some_taken) {
6826                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6827                                 sp->put_last_out = 1;
6828                         } else {
6829                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6830                                 sp->put_last_out = 1;
6831                         }
6832                 } else {
6833                         /* Not all of it fits, we fragment */
6834                         if (sp->some_taken == 0) {
6835                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6836                         }
6837                         sp->some_taken = 1;
6838                 }
6839         } else {
6840                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6841                 if (to_move) {
6842                         /*-
6843                          * We use a snapshot of length in case it
6844                          * is expanding during the compare.
6845                          */
6846                         uint32_t llen;
6847
6848                         llen = length;
6849                         if (to_move >= llen) {
6850                                 to_move = llen;
6851                                 if (send_lock_up == 0) {
6852                                         /*-
6853                                          * We are taking all of an incomplete msg
6854                                          * thus we need a send lock.
6855                                          */
6856                                         SCTP_TCB_SEND_LOCK(stcb);
6857                                         send_lock_up = 1;
6858                                         if (sp->msg_is_complete) {
6859                                                 /*
6860                                                  * the sender finished the
6861                                                  * msg
6862                                                  */
6863                                                 goto re_look;
6864                                         }
6865                                 }
6866                         }
6867                         if (sp->some_taken == 0) {
6868                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6869                                 sp->some_taken = 1;
6870                         }
6871                 } else {
6872                         /* Nothing to take. */
6873                         if (sp->some_taken) {
6874                                 *locked = 1;
6875                         }
6876                         *giveup = 1;
6877                         to_move = 0;
6878                         goto out_of;
6879                 }
6880         }
6881
6882         /* If we reach here, we can copy out a chunk */
6883         sctp_alloc_a_chunk(stcb, chk);
6884         if (chk == NULL) {
6885                 /* No chunk memory */
6886                 *giveup = 1;
6887                 to_move = 0;
6888                 goto out_of;
6889         }
6890         /*
6891          * Setup for unordered if needed by looking at the user sent info
6892          * flags.
6893          */
6894         if (sp->sinfo_flags & SCTP_UNORDERED) {
6895                 rcv_flags |= SCTP_DATA_UNORDERED;
6896         }
6897         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6898             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6899                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6900         }
6901         /* clear out the chunk before setting up */
6902         memset(chk, 0, sizeof(*chk));
6903         chk->rec.data.rcv_flags = rcv_flags;
6904
6905         if (to_move >= length) {
6906                 /* we think we can steal the whole thing */
6907                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6908                         SCTP_TCB_SEND_LOCK(stcb);
6909                         send_lock_up = 1;
6910                 }
6911                 if (to_move < sp->length) {
6912                         /* bail, it changed */
6913                         goto dont_do_it;
6914                 }
6915                 chk->data = sp->data;
6916                 chk->last_mbuf = sp->tail_mbuf;
6917                 /* register the stealing */
6918                 sp->data = sp->tail_mbuf = NULL;
6919         } else {
6920                 struct mbuf *m;
6921
6922 dont_do_it:
6923                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6924                 chk->last_mbuf = NULL;
6925                 if (chk->data == NULL) {
6926                         sp->some_taken = some_taken;
6927                         sctp_free_a_chunk(stcb, chk);
6928                         *bail = 1;
6929                         to_move = 0;
6930                         goto out_of;
6931                 }
6932 #ifdef SCTP_MBUF_LOGGING
6933                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6934                         struct mbuf *mat;
6935
6936                         mat = chk->data;
6937                         while (mat) {
6938                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6939                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6940                                 }
6941                                 mat = SCTP_BUF_NEXT(mat);
6942                         }
6943                 }
6944 #endif
6945                 /* Pull off the data */
6946                 m_adj(sp->data, to_move);
6947                 /* Now lets work our way down and compact it */
6948                 m = sp->data;
6949                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6950                         sp->data = SCTP_BUF_NEXT(m);
6951                         SCTP_BUF_NEXT(m) = NULL;
6952                         if (sp->tail_mbuf == m) {
6953                                 /*-
6954                                  * Freeing tail? TSNH since
6955                                  * we supposedly were taking less
6956                                  * than the sp->length.
6957                                  */
6958 #ifdef INVARIANTS
6959                                 panic("Huh, freing tail? - TSNH");
6960 #else
6961                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6962                                 sp->tail_mbuf = sp->data = NULL;
6963                                 sp->length = 0;
6964 #endif
6965
6966                         }
6967                         sctp_m_free(m);
6968                         m = sp->data;
6969                 }
6970         }
6971         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6972                 chk->copy_by_ref = 1;
6973         } else {
6974                 chk->copy_by_ref = 0;
6975         }
6976         /*
6977          * get last_mbuf and counts of mb useage This is ugly but hopefully
6978          * its only one mbuf.
6979          */
6980         if (chk->last_mbuf == NULL) {
6981                 chk->last_mbuf = chk->data;
6982                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6983                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6984                 }
6985         }
6986         if (to_move > length) {
6987                 /*- This should not happen either
6988                  * since we always lower to_move to the size
6989                  * of sp->length if its larger.
6990                  */
6991 #ifdef INVARIANTS
6992                 panic("Huh, how can to_move be larger?");
6993 #else
6994                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6995                 sp->length = 0;
6996 #endif
6997         } else {
6998                 atomic_subtract_int(&sp->length, to_move);
6999         }
7000         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7001                 /* Not enough room for a chunk header, get some */
7002                 struct mbuf *m;
7003
7004                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7005                 if (m == NULL) {
7006                         /*
7007                          * we're in trouble here. _PREPEND below will free
7008                          * all the data if there is no leading space, so we
7009                          * must put the data back and restore.
7010                          */
7011                         if (send_lock_up == 0) {
7012                                 SCTP_TCB_SEND_LOCK(stcb);
7013                                 send_lock_up = 1;
7014                         }
7015                         if (chk->data == NULL) {
7016                                 /* unsteal the data */
7017                                 sp->data = chk->data;
7018                                 sp->tail_mbuf = chk->last_mbuf;
7019                         } else {
7020                                 struct mbuf *m_tmp;
7021
7022                                 /* reassemble the data */
7023                                 m_tmp = sp->data;
7024                                 sp->data = chk->data;
7025                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7026                         }
7027                         sp->some_taken = some_taken;
7028                         atomic_add_int(&sp->length, to_move);
7029                         chk->data = NULL;
7030                         *bail = 1;
7031                         sctp_free_a_chunk(stcb, chk);
7032                         to_move = 0;
7033                         goto out_of;
7034                 } else {
7035                         SCTP_BUF_LEN(m) = 0;
7036                         SCTP_BUF_NEXT(m) = chk->data;
7037                         chk->data = m;
7038                         M_ALIGN(chk->data, 4);
7039                 }
7040         }
7041         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7042         if (chk->data == NULL) {
7043                 /* HELP, TSNH since we assured it would not above? */
7044 #ifdef INVARIANTS
7045                 panic("prepend failes HELP?");
7046 #else
7047                 SCTP_PRINTF("prepend fails HELP?\n");
7048                 sctp_free_a_chunk(stcb, chk);
7049 #endif
7050                 *bail = 1;
7051                 to_move = 0;
7052                 goto out_of;
7053         }
7054         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7055         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7056         chk->book_size_scale = 0;
7057         chk->sent = SCTP_DATAGRAM_UNSENT;
7058
7059         chk->flags = 0;
7060         chk->asoc = &stcb->asoc;
7061         chk->pad_inplace = 0;
7062         chk->no_fr_allowed = 0;
7063         chk->rec.data.stream_seq = sp->strseq;
7064         chk->rec.data.stream_number = sp->stream;
7065         chk->rec.data.payloadtype = sp->ppid;
7066         chk->rec.data.context = sp->context;
7067         chk->rec.data.doing_fast_retransmit = 0;
7068         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7069
7070         chk->rec.data.timetodrop = sp->ts;
7071         chk->flags = sp->act_flags;
7072         chk->addr_over = sp->addr_over;
7073
7074         chk->whoTo = net;
7075         atomic_add_int(&chk->whoTo->ref_count, 1);
7076
7077         if (sp->holds_key_ref) {
7078                 chk->auth_keyid = sp->auth_keyid;
7079                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7080                 chk->holds_key_ref = 1;
7081         }
7082         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7083         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7084                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7085                     (uintptr_t) stcb, sp->length,
7086                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7087                     chk->rec.data.TSN_seq);
7088         }
7089         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7090         /*
7091          * Put the rest of the things in place now. Size was done earlier in
7092          * previous loop prior to padding.
7093          */
7094
7095 #ifdef SCTP_ASOCLOG_OF_TSNS
7096         SCTP_TCB_LOCK_ASSERT(stcb);
7097         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7098                 asoc->tsn_out_at = 0;
7099                 asoc->tsn_out_wrapped = 1;
7100         }
7101         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7102         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7103         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7104         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7105         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7106         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7107         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7108         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7109         asoc->tsn_out_at++;
7110 #endif
7111
7112         dchkh->ch.chunk_type = SCTP_DATA;
7113         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7114         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7115         dchkh->dp.stream_id = htons(strq->stream_no);
7116         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7117         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7118         dchkh->ch.chunk_length = htons(chk->send_size);
7119         /* Now advance the chk->send_size by the actual pad needed. */
7120         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7121                 /* need a pad */
7122                 struct mbuf *lm;
7123                 int pads;
7124
7125                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7126                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7127                         chk->pad_inplace = 1;
7128                 }
7129                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7130                         /* pad added an mbuf */
7131                         chk->last_mbuf = lm;
7132                 }
7133                 chk->send_size += pads;
7134         }
7135         /* We only re-set the policy if it is on */
7136         if (sp->pr_sctp_on) {
7137                 sctp_set_prsctp_policy(sp);
7138                 asoc->pr_sctp_cnt++;
7139                 chk->pr_sctp_on = 1;
7140         } else {
7141                 chk->pr_sctp_on = 0;
7142         }
7143         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7144                 /* All done pull and kill the message */
7145                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7146                 if (sp->put_last_out == 0) {
7147                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7148                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7149                             sp->sender_all_done,
7150                             sp->length,
7151                             sp->msg_is_complete,
7152                             sp->put_last_out,
7153                             send_lock_up);
7154                 }
7155                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7156                         SCTP_TCB_SEND_LOCK(stcb);
7157                         send_lock_up = 1;
7158                 }
7159                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7160                 sctp_free_remote_addr(sp->net);
7161                 if (sp->data) {
7162                         sctp_m_freem(sp->data);
7163                         sp->data = NULL;
7164                 }
7165                 sctp_free_a_strmoq(stcb, sp);
7166
7167                 /* we can't be locked to it */
7168                 *locked = 0;
7169                 stcb->asoc.locked_on_sending = NULL;
7170         } else {
7171                 /* more to go, we are locked */
7172                 *locked = 1;
7173         }
7174         asoc->chunks_on_out_queue++;
7175         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7176         asoc->send_queue_cnt++;
7177 out_of:
7178         if (send_lock_up) {
7179                 SCTP_TCB_SEND_UNLOCK(stcb);
7180                 send_lock_up = 0;
7181         }
7182         return (to_move);
7183 }
7184
7185
7186 static struct sctp_stream_out *
7187 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7188 {
7189         struct sctp_stream_out *strq;
7190
7191         /* Find the next stream to use */
7192         if (asoc->last_out_stream == NULL) {
7193                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7194                 if (asoc->last_out_stream == NULL) {
7195                         /* huh nothing on the wheel, TSNH */
7196                         return (NULL);
7197                 }
7198                 goto done_it;
7199         }
7200         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7201 done_it:
7202         if (strq == NULL) {
7203                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7204         }
7205         /* Save off the last stream */
7206         asoc->last_out_stream = strq;
7207         return (strq);
7208
7209 }
7210
7211
7212 static void
7213 sctp_fill_outqueue(struct sctp_tcb *stcb,
7214     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7215 {
7216         struct sctp_association *asoc;
7217         struct sctp_stream_out *strq, *strqn, *strqt;
7218         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7219         int locked, giveup;
7220         struct sctp_stream_queue_pending *sp;
7221
7222         SCTP_TCB_LOCK_ASSERT(stcb);
7223         asoc = &stcb->asoc;
7224 #ifdef INET6
7225         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7226                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7227         } else {
7228                 /* ?? not sure what else to do */
7229                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7230         }
7231 #else
7232         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7233 #endif
7234         /* Need an allowance for the data chunk header too */
7235         goal_mtu -= sizeof(struct sctp_data_chunk);
7236
7237         /* must make even word boundary */
7238         goal_mtu &= 0xfffffffc;
7239         if (asoc->locked_on_sending) {
7240                 /* We are stuck on one stream until the message completes. */
7241                 strqn = strq = asoc->locked_on_sending;
7242                 locked = 1;
7243         } else {
7244                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7245                 locked = 0;
7246         }
7247
7248         while ((goal_mtu > 0) && strq) {
7249                 sp = TAILQ_FIRST(&strq->outqueue);
7250                 /*
7251                  * If CMT is off, we must validate that the stream in
7252                  * question has the first item pointed towards are network
7253                  * destionation requested by the caller. Note that if we
7254                  * turn out to be locked to a stream (assigning TSN's then
7255                  * we must stop, since we cannot look for another stream
7256                  * with data to send to that destination). In CMT's case, by
7257                  * skipping this check, we will send one data packet towards
7258                  * the requested net.
7259                  */
7260                 if (sp == NULL) {
7261                         break;
7262                 }
7263                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7264                         /* none for this network */
7265                         if (locked) {
7266                                 break;
7267                         } else {
7268                                 strq = sctp_select_a_stream(stcb, asoc);
7269                                 if (strq == NULL)
7270                                         /* none left */
7271                                         break;
7272                                 if (strqn == strq) {
7273                                         /* I have circled */
7274                                         break;
7275                                 }
7276                                 continue;
7277                         }
7278                 }
7279                 giveup = 0;
7280                 bail = 0;
7281                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7282                     &giveup, eeor_mode, &bail);
7283                 asoc->last_out_stream = strq;
7284                 if (locked) {
7285                         asoc->locked_on_sending = strq;
7286                         if ((moved_how_much == 0) || (giveup) || bail)
7287                                 /* no more to move for now */
7288                                 break;
7289                 } else {
7290                         asoc->locked_on_sending = NULL;
7291                         strqt = sctp_select_a_stream(stcb, asoc);
7292                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7293                                 if (strq == strqn) {
7294                                         /* Must move start to next one */
7295                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7296                                         if (strqn == NULL) {
7297                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7298                                                 if (strqn == NULL) {
7299                                                         break;
7300                                                 }
7301                                         }
7302                                 }
7303                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7304                         }
7305                         if ((giveup) || bail) {
7306                                 break;
7307                         }
7308                         strq = strqt;
7309                         if (strq == NULL) {
7310                                 break;
7311                         }
7312                 }
7313                 total_moved += moved_how_much;
7314                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7315                 goal_mtu &= 0xfffffffc;
7316         }
7317         if (bail)
7318                 *quit_now = 1;
7319
7320         if (total_moved == 0) {
7321                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7322                     (net == stcb->asoc.primary_destination)) {
7323                         /* ran dry for primary network net */
7324                         SCTP_STAT_INCR(sctps_primary_randry);
7325                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7326                         /* ran dry with CMT on */
7327                         SCTP_STAT_INCR(sctps_cmt_randry);
7328                 }
7329         }
7330 }
7331
7332 void
7333 sctp_fix_ecn_echo(struct sctp_association *asoc)
7334 {
7335         struct sctp_tmit_chunk *chk;
7336
7337         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7338                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7339                         chk->sent = SCTP_DATAGRAM_UNSENT;
7340                 }
7341         }
7342 }
7343
7344 static void
7345 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7346     struct sctp_association *asoc,
7347     struct sctp_nets *net)
7348 {
7349         struct sctp_tmit_chunk *chk;
7350         struct sctp_nets *a_net;
7351
7352         SCTP_TCB_LOCK_ASSERT(stcb);
7353         /*
7354          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7355          * destination using the PF algorithm for finding alternate
7356          * destinations.
7357          */
7358         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7359                 a_net = sctp_find_alternate_net(stcb, net, 2);
7360         } else {
7361                 a_net = sctp_find_alternate_net(stcb, net, 0);
7362         }
7363         if ((a_net != net) &&
7364             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7365                 /*
7366                  * We only proceed if a valid alternate is found that is not
7367                  * this one and is reachable. Here we must move all chunks
7368                  * queued in the send queue off of the destination address
7369                  * to our alternate.
7370                  */
7371                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7372                         if (chk->whoTo == net) {
7373                                 /* Move the chunk to our alternate */
7374                                 sctp_free_remote_addr(chk->whoTo);
7375                                 chk->whoTo = a_net;
7376                                 atomic_add_int(&a_net->ref_count, 1);
7377                         }
7378                 }
7379         }
7380 }
7381
7382 int
7383 sctp_med_chunk_output(struct sctp_inpcb *inp,
7384     struct sctp_tcb *stcb,
7385     struct sctp_association *asoc,
7386     int *num_out,
7387     int *reason_code,
7388     int control_only, int from_where,
7389     struct timeval *now, int *now_filled, int frag_point, int so_locked
7390 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7391     SCTP_UNUSED
7392 #endif
7393 )
7394 {
7395         /*
7396          * Ok this is the generic chunk service queue. we must do the
7397          * following: - Service the stream queue that is next, moving any
7398          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7399          * LAST to the out queue in one pass) and assigning TSN's - Check to
7400          * see if the cwnd/rwnd allows any output, if so we go ahead and
7401          * fomulate and send the low level chunks. Making sure to combine
7402          * any control in the control chunk queue also.
7403          */
7404         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7405         struct mbuf *outchain, *endoutchain;
7406         struct sctp_tmit_chunk *chk, *nchk;
7407
7408         /* temp arrays for unlinking */
7409         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7410         int no_fragmentflg, error;
7411         unsigned int max_rwnd_per_dest;
7412         int one_chunk, hbflag, skip_data_for_this_net;
7413         int asconf, cookie, no_out_cnt;
7414         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7415         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7416         int tsns_sent = 0;
7417         uint32_t auth_offset = 0;
7418         struct sctp_auth_chunk *auth = NULL;
7419         uint16_t auth_keyid;
7420         int override_ok = 1;
7421         int data_auth_reqd = 0;
7422
7423         /*
7424          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7425          * destination.
7426          */
7427         int pf_hbflag = 0;
7428         int quit_now = 0;
7429
7430         *num_out = 0;
7431         auth_keyid = stcb->asoc.authinfo.active_keyid;
7432
7433         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7434             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7435             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7436                 eeor_mode = 1;
7437         } else {
7438                 eeor_mode = 0;
7439         }
7440         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7441         /*
7442          * First lets prime the pump. For each destination, if there is room
7443          * in the flight size, attempt to pull an MTU's worth out of the
7444          * stream queues into the general send_queue
7445          */
7446 #ifdef SCTP_AUDITING_ENABLED
7447         sctp_audit_log(0xC2, 2);
7448 #endif
7449         SCTP_TCB_LOCK_ASSERT(stcb);
7450         hbflag = 0;
7451         if ((control_only) || (asoc->stream_reset_outstanding))
7452                 no_data_chunks = 1;
7453         else
7454                 no_data_chunks = 0;
7455
7456         /* Nothing to possible to send? */
7457         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7458             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7459             TAILQ_EMPTY(&asoc->send_queue) &&
7460             TAILQ_EMPTY(&asoc->out_wheel)) {
7461                 *reason_code = 9;
7462                 return (0);
7463         }
7464         if (asoc->peers_rwnd == 0) {
7465                 /* No room in peers rwnd */
7466                 *reason_code = 1;
7467                 if (asoc->total_flight > 0) {
7468                         /* we are allowed one chunk in flight */
7469                         no_data_chunks = 1;
7470                 }
7471         }
7472         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7473         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7474                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7475                         /*
7476                          * This for loop we are in takes in each net, if
7477                          * its's got space in cwnd and has data sent to it
7478                          * (when CMT is off) then it calls
7479                          * sctp_fill_outqueue for the net. This gets data on
7480                          * the send queue for that network.
7481                          *
7482                          * In sctp_fill_outqueue TSN's are assigned and data is
7483                          * copied out of the stream buffers. Note mostly
7484                          * copy by reference (we hope).
7485                          */
7486                         net->window_probe = 0;
7487                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7488                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7489                                         sctp_log_cwnd(stcb, net, 1,
7490                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7491                                 }
7492                                 continue;
7493                         }
7494                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7495                                 /* nothing can be in queue for this guy */
7496                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7497                                         sctp_log_cwnd(stcb, net, 2,
7498                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7499                                 }
7500                                 continue;
7501                         }
7502                         if (net->flight_size >= net->cwnd) {
7503                                 /* skip this network, no room - can't fill */
7504                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7505                                         sctp_log_cwnd(stcb, net, 3,
7506                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7507                                 }
7508                                 continue;
7509                         }
7510                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7511                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7512                         }
7513                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7514                         if (quit_now) {
7515                                 /* memory alloc failure */
7516                                 no_data_chunks = 1;
7517                                 break;
7518                         }
7519                 }
7520         }
7521         /* now service each destination and send out what we can for it */
7522         /* Nothing to send? */
7523         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7524             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7525             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7526                 *reason_code = 8;
7527                 return (0);
7528         }
7529         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7530                 /* get the last start point */
7531                 start_at = asoc->last_net_cmt_send_started;
7532                 if (start_at == NULL) {
7533                         /* null so to beginning */
7534                         start_at = TAILQ_FIRST(&asoc->nets);
7535                 } else {
7536                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7537                         if (start_at == NULL) {
7538                                 start_at = TAILQ_FIRST(&asoc->nets);
7539                         }
7540                 }
7541                 asoc->last_net_cmt_send_started = start_at;
7542         } else {
7543                 start_at = TAILQ_FIRST(&asoc->nets);
7544         }
7545         old_start_at = NULL;
7546 again_one_more_time:
7547         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7548                 /* how much can we send? */
7549                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7550                 if (old_start_at && (old_start_at == net)) {
7551                         /* through list ocmpletely. */
7552                         break;
7553                 }
7554                 tsns_sent = 0xa;
7555                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7556                         /*
7557                          * Ref-count of 1 so we cannot have data or control
7558                          * queued to this address. Skip it (non-CMT).
7559                          */
7560                         continue;
7561                 }
7562                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7563                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7564                     (net->flight_size >= net->cwnd)) {
7565                         /*
7566                          * Nothing on control or asconf and flight is full,
7567                          * we can skip even in the CMT case.
7568                          */
7569                         continue;
7570                 }
7571                 ctl_cnt = bundle_at = 0;
7572                 endoutchain = outchain = NULL;
7573                 no_fragmentflg = 1;
7574                 one_chunk = 0;
7575                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7576                         skip_data_for_this_net = 1;
7577                 } else {
7578                         skip_data_for_this_net = 0;
7579                 }
7580                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7581                         /*
7582                          * if we have a route and an ifp check to see if we
7583                          * have room to send to this guy
7584                          */
7585                         struct ifnet *ifp;
7586
7587                         ifp = net->ro.ro_rt->rt_ifp;
7588                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7589                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7590                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7591                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7592                                 }
7593                                 continue;
7594                         }
7595                 }
7596                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7597                 case AF_INET:
7598                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7599                         break;
7600 #ifdef INET6
7601                 case AF_INET6:
7602                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7603                         break;
7604 #endif
7605                 default:
7606                         /* TSNH */
7607                         mtu = net->mtu;
7608                         break;
7609                 }
7610                 mx_mtu = mtu;
7611                 to_out = 0;
7612                 if (mtu > asoc->peers_rwnd) {
7613                         if (asoc->total_flight > 0) {
7614                                 /* We have a packet in flight somewhere */
7615                                 r_mtu = asoc->peers_rwnd;
7616                         } else {
7617                                 /* We are always allowed to send one MTU out */
7618                                 one_chunk = 1;
7619                                 r_mtu = mtu;
7620                         }
7621                 } else {
7622                         r_mtu = mtu;
7623                 }
7624                 /************************/
7625                 /* ASCONF transmission */
7626                 /************************/
7627                 /* Now first lets go through the asconf queue */
7628                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7629                     chk; chk = nchk) {
7630                         nchk = TAILQ_NEXT(chk, sctp_next);
7631                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7632                                 continue;
7633                         }
7634                         if (chk->whoTo != net) {
7635                                 /*
7636                                  * No, not sent to the network we are
7637                                  * looking at
7638                                  */
7639                                 break;
7640                         }
7641                         if (chk->data == NULL) {
7642                                 break;
7643                         }
7644                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7645                             chk->sent != SCTP_DATAGRAM_RESEND) {
7646                                 break;
7647                         }
7648                         /*
7649                          * if no AUTH is yet included and this chunk
7650                          * requires it, make sure to account for it.  We
7651                          * don't apply the size until the AUTH chunk is
7652                          * actually added below in case there is no room for
7653                          * this chunk. NOTE: we overload the use of "omtu"
7654                          * here
7655                          */
7656                         if ((auth == NULL) &&
7657                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7658                             stcb->asoc.peer_auth_chunks)) {
7659                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7660                         } else
7661                                 omtu = 0;
7662                         /* Here we do NOT factor the r_mtu */
7663                         if ((chk->send_size < (int)(mtu - omtu)) ||
7664                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7665                                 /*
7666                                  * We probably should glom the mbuf chain
7667                                  * from the chk->data for control but the
7668                                  * problem is it becomes yet one more level
7669                                  * of tracking to do if for some reason
7670                                  * output fails. Then I have got to
7671                                  * reconstruct the merged control chain.. el
7672                                  * yucko.. for now we take the easy way and
7673                                  * do the copy
7674                                  */
7675                                 /*
7676                                  * Add an AUTH chunk, if chunk requires it
7677                                  * save the offset into the chain for AUTH
7678                                  */
7679                                 if ((auth == NULL) &&
7680                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7681                                     stcb->asoc.peer_auth_chunks))) {
7682                                         outchain = sctp_add_auth_chunk(outchain,
7683                                             &endoutchain,
7684                                             &auth,
7685                                             &auth_offset,
7686                                             stcb,
7687                                             chk->rec.chunk_id.id);
7688                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7689                                 }
7690                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7691                                     (int)chk->rec.chunk_id.can_take_data,
7692                                     chk->send_size, chk->copy_by_ref);
7693                                 if (outchain == NULL) {
7694                                         *reason_code = 8;
7695                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7696                                         return (ENOMEM);
7697                                 }
7698                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7699                                 /* update our MTU size */
7700                                 if (mtu > (chk->send_size + omtu))
7701                                         mtu -= (chk->send_size + omtu);
7702                                 else
7703                                         mtu = 0;
7704                                 to_out += (chk->send_size + omtu);
7705                                 /* Do clear IP_DF ? */
7706                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7707                                         no_fragmentflg = 0;
7708                                 }
7709                                 if (chk->rec.chunk_id.can_take_data)
7710                                         chk->data = NULL;
7711                                 /*
7712                                  * set hb flag since we can use these for
7713                                  * RTO
7714                                  */
7715                                 hbflag = 1;
7716                                 asconf = 1;
7717                                 /*
7718                                  * should sysctl this: don't bundle data
7719                                  * with ASCONF since it requires AUTH
7720                                  */
7721                                 no_data_chunks = 1;
7722                                 chk->sent = SCTP_DATAGRAM_SENT;
7723                                 chk->snd_count++;
7724                                 if (mtu == 0) {
7725                                         /*
7726                                          * Ok we are out of room but we can
7727                                          * output without effecting the
7728                                          * flight size since this little guy
7729                                          * is a control only packet.
7730                                          */
7731                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7732                                         /*
7733                                          * do NOT clear the asconf flag as
7734                                          * it is used to do appropriate
7735                                          * source address selection.
7736                                          */
7737                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7738                                             (struct sockaddr *)&net->ro._l_addr,
7739                                             outchain, auth_offset, auth,
7740                                             stcb->asoc.authinfo.active_keyid,
7741                                             no_fragmentflg, 0, NULL, asconf,
7742                                             inp->sctp_lport, stcb->rport,
7743                                             htonl(stcb->asoc.peer_vtag),
7744                                             net->port, so_locked, NULL))) {
7745                                                 if (error == ENOBUFS) {
7746                                                         asoc->ifp_had_enobuf = 1;
7747                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7748                                                 }
7749                                                 if (from_where == 0) {
7750                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7751                                                 }
7752                                                 if (*now_filled == 0) {
7753                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7754                                                         *now_filled = 1;
7755                                                         *now = net->last_sent_time;
7756                                                 } else {
7757                                                         net->last_sent_time = *now;
7758                                                 }
7759                                                 hbflag = 0;
7760                                                 /* error, could not output */
7761                                                 if (error == EHOSTUNREACH) {
7762                                                         /*
7763                                                          * Destination went
7764                                                          * unreachable
7765                                                          * during this send
7766                                                          */
7767                                                         sctp_move_to_an_alt(stcb, asoc, net);
7768                                                 }
7769                                                 *reason_code = 7;
7770                                                 continue;
7771                                         } else
7772                                                 asoc->ifp_had_enobuf = 0;
7773                                         if (*now_filled == 0) {
7774                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7775                                                 *now_filled = 1;
7776                                                 *now = net->last_sent_time;
7777                                         } else {
7778                                                 net->last_sent_time = *now;
7779                                         }
7780                                         hbflag = 0;
7781                                         /*
7782                                          * increase the number we sent, if a
7783                                          * cookie is sent we don't tell them
7784                                          * any was sent out.
7785                                          */
7786                                         outchain = endoutchain = NULL;
7787                                         auth = NULL;
7788                                         auth_offset = 0;
7789                                         if (!no_out_cnt)
7790                                                 *num_out += ctl_cnt;
7791                                         /* recalc a clean slate and setup */
7792                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7793                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7794                                         } else {
7795                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7796                                         }
7797                                         to_out = 0;
7798                                         no_fragmentflg = 1;
7799                                 }
7800                         }
7801                 }
7802                 /************************/
7803                 /* Control transmission */
7804                 /************************/
7805                 /* Now first lets go through the control queue */
7806                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7807                     chk; chk = nchk) {
7808                         nchk = TAILQ_NEXT(chk, sctp_next);
7809                         if (chk->whoTo != net) {
7810                                 /*
7811                                  * No, not sent to the network we are
7812                                  * looking at
7813                                  */
7814                                 continue;
7815                         }
7816                         if (chk->data == NULL) {
7817                                 continue;
7818                         }
7819                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7820                                 /*
7821                                  * It must be unsent. Cookies and ASCONF's
7822                                  * hang around but there timers will force
7823                                  * when marked for resend.
7824                                  */
7825                                 continue;
7826                         }
7827                         /*
7828                          * if no AUTH is yet included and this chunk
7829                          * requires it, make sure to account for it.  We
7830                          * don't apply the size until the AUTH chunk is
7831                          * actually added below in case there is no room for
7832                          * this chunk. NOTE: we overload the use of "omtu"
7833                          * here
7834                          */
7835                         if ((auth == NULL) &&
7836                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7837                             stcb->asoc.peer_auth_chunks)) {
7838                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7839                         } else
7840                                 omtu = 0;
7841                         /* Here we do NOT factor the r_mtu */
7842                         if ((chk->send_size < (int)(mtu - omtu)) ||
7843                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7844                                 /*
7845                                  * We probably should glom the mbuf chain
7846                                  * from the chk->data for control but the
7847                                  * problem is it becomes yet one more level
7848                                  * of tracking to do if for some reason
7849                                  * output fails. Then I have got to
7850                                  * reconstruct the merged control chain.. el
7851                                  * yucko.. for now we take the easy way and
7852                                  * do the copy
7853                                  */
7854                                 /*
7855                                  * Add an AUTH chunk, if chunk requires it
7856                                  * save the offset into the chain for AUTH
7857                                  */
7858                                 if ((auth == NULL) &&
7859                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7860                                     stcb->asoc.peer_auth_chunks))) {
7861                                         outchain = sctp_add_auth_chunk(outchain,
7862                                             &endoutchain,
7863                                             &auth,
7864                                             &auth_offset,
7865                                             stcb,
7866                                             chk->rec.chunk_id.id);
7867                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7868                                 }
7869                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7870                                     (int)chk->rec.chunk_id.can_take_data,
7871                                     chk->send_size, chk->copy_by_ref);
7872                                 if (outchain == NULL) {
7873                                         *reason_code = 8;
7874                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7875                                         return (ENOMEM);
7876                                 }
7877                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7878                                 /* update our MTU size */
7879                                 if (mtu > (chk->send_size + omtu))
7880                                         mtu -= (chk->send_size + omtu);
7881                                 else
7882                                         mtu = 0;
7883                                 to_out += (chk->send_size + omtu);
7884                                 /* Do clear IP_DF ? */
7885                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7886                                         no_fragmentflg = 0;
7887                                 }
7888                                 if (chk->rec.chunk_id.can_take_data)
7889                                         chk->data = NULL;
7890                                 /* Mark things to be removed, if needed */
7891                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7892                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7893                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7894                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7895                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7896                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7897                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7898                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7899                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7900                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7901                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7902
7903                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7904                                                 hbflag = 1;
7905                                                 /*
7906                                                  * JRS 5/14/07 - Set the
7907                                                  * flag to say a heartbeat
7908                                                  * is being sent.
7909                                                  */
7910                                                 pf_hbflag = 1;
7911                                         }
7912                                         /* remove these chunks at the end */
7913                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7914                                                 /* turn off the timer */
7915                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7916                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7917                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7918                                                 }
7919                                         }
7920                                         /*
7921                                          * EY -Nr-sack version of the above
7922                                          * if statement
7923                                          */
7924                                         if ((SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) &&
7925                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {  /* EY !?! */
7926                                                 /* turn off the timer */
7927                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7928                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7929                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7930                                                 }
7931                                         }
7932                                         ctl_cnt++;
7933                                 } else {
7934                                         /*
7935                                          * Other chunks, since they have
7936                                          * timers running (i.e. COOKIE) we
7937                                          * just "trust" that it gets sent or
7938                                          * retransmitted.
7939                                          */
7940                                         ctl_cnt++;
7941                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7942                                                 cookie = 1;
7943                                                 no_out_cnt = 1;
7944                                         }
7945                                         chk->sent = SCTP_DATAGRAM_SENT;
7946                                         chk->snd_count++;
7947                                 }
7948                                 if (mtu == 0) {
7949                                         /*
7950                                          * Ok we are out of room but we can
7951                                          * output without effecting the
7952                                          * flight size since this little guy
7953                                          * is a control only packet.
7954                                          */
7955                                         if (asconf) {
7956                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7957                                                 /*
7958                                                  * do NOT clear the asconf
7959                                                  * flag as it is used to do
7960                                                  * appropriate source
7961                                                  * address selection.
7962                                                  */
7963                                         }
7964                                         if (cookie) {
7965                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7966                                                 cookie = 0;
7967                                         }
7968                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7969                                             (struct sockaddr *)&net->ro._l_addr,
7970                                             outchain,
7971                                             auth_offset, auth,
7972                                             stcb->asoc.authinfo.active_keyid,
7973                                             no_fragmentflg, 0, NULL, asconf,
7974                                             inp->sctp_lport, stcb->rport,
7975                                             htonl(stcb->asoc.peer_vtag),
7976                                             net->port, so_locked, NULL))) {
7977                                                 if (error == ENOBUFS) {
7978                                                         asoc->ifp_had_enobuf = 1;
7979                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7980                                                 }
7981                                                 if (from_where == 0) {
7982                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7983                                                 }
7984                                                 /* error, could not output */
7985                                                 if (hbflag) {
7986                                                         if (*now_filled == 0) {
7987                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7988                                                                 *now_filled = 1;
7989                                                                 *now = net->last_sent_time;
7990                                                         } else {
7991                                                                 net->last_sent_time = *now;
7992                                                         }
7993                                                         hbflag = 0;
7994                                                 }
7995                                                 if (error == EHOSTUNREACH) {
7996                                                         /*
7997                                                          * Destination went
7998                                                          * unreachable
7999                                                          * during this send
8000                                                          */
8001                                                         sctp_move_to_an_alt(stcb, asoc, net);
8002                                                 }
8003                                                 *reason_code = 7;
8004                                                 continue;
8005                                         } else
8006                                                 asoc->ifp_had_enobuf = 0;
8007                                         /* Only HB or ASCONF advances time */
8008                                         if (hbflag) {
8009                                                 if (*now_filled == 0) {
8010                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8011                                                         *now_filled = 1;
8012                                                         *now = net->last_sent_time;
8013                                                 } else {
8014                                                         net->last_sent_time = *now;
8015                                                 }
8016                                                 hbflag = 0;
8017                                         }
8018                                         /*
8019                                          * increase the number we sent, if a
8020                                          * cookie is sent we don't tell them
8021                                          * any was sent out.
8022                                          */
8023                                         outchain = endoutchain = NULL;
8024                                         auth = NULL;
8025                                         auth_offset = 0;
8026                                         if (!no_out_cnt)
8027                                                 *num_out += ctl_cnt;
8028                                         /* recalc a clean slate and setup */
8029                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8030                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8031                                         } else {
8032                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8033                                         }
8034                                         to_out = 0;
8035                                         no_fragmentflg = 1;
8036                                 }
8037                         }
8038                 }
8039                 /* JRI: if dest is in PF state, do not send data to it */
8040                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8041                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8042                     (net->dest_state & SCTP_ADDR_PF)) {
8043                         goto no_data_fill;
8044                 }
8045                 if (net->flight_size >= net->cwnd) {
8046                         goto no_data_fill;
8047                 }
8048                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) &&
8049                     (net->flight_size > max_rwnd_per_dest)) {
8050                         goto no_data_fill;
8051                 }
8052                 /*********************/
8053                 /* Data transmission */
8054                 /*********************/
8055                 /*
8056                  * if AUTH for DATA is required and no AUTH has been added
8057                  * yet, account for this in the mtu now... if no data can be
8058                  * bundled, this adjustment won't matter anyways since the
8059                  * packet will be going out...
8060                  */
8061                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8062                     stcb->asoc.peer_auth_chunks);
8063                 if (data_auth_reqd && (auth == NULL)) {
8064                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8065                 }
8066                 /* now lets add any data within the MTU constraints */
8067                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8068                 case AF_INET:
8069                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8070                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8071                         else
8072                                 omtu = 0;
8073                         break;
8074 #ifdef INET6
8075                 case AF_INET6:
8076                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8077                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8078                         else
8079                                 omtu = 0;
8080                         break;
8081 #endif
8082                 default:
8083                         /* TSNH */
8084                         omtu = 0;
8085                         break;
8086                 }
8087                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8088                     (skip_data_for_this_net == 0)) ||
8089                     (cookie)) {
8090                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8091                                 if (no_data_chunks) {
8092                                         /* let only control go out */
8093                                         *reason_code = 1;
8094                                         break;
8095                                 }
8096                                 if (net->flight_size >= net->cwnd) {
8097                                         /* skip this net, no room for data */
8098                                         *reason_code = 2;
8099                                         break;
8100                                 }
8101                                 nchk = TAILQ_NEXT(chk, sctp_next);
8102                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
8103                                         if (chk->whoTo != net) {
8104                                                 /*
8105                                                  * For CMT, steal the data
8106                                                  * to this network if its
8107                                                  * not set here.
8108                                                  */
8109                                                 sctp_free_remote_addr(chk->whoTo);
8110                                                 chk->whoTo = net;
8111                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8112                                         }
8113                                 } else if (chk->whoTo != net) {
8114                                         /* No, not sent to this net */
8115                                         continue;
8116                                 }
8117                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8118                                         /*-
8119                                          * strange, we have a chunk that is
8120                                          * to big for its destination and
8121                                          * yet no fragment ok flag.
8122                                          * Something went wrong when the
8123                                          * PMTU changed...we did not mark
8124                                          * this chunk for some reason?? I
8125                                          * will fix it here by letting IP
8126                                          * fragment it for now and printing
8127                                          * a warning. This really should not
8128                                          * happen ...
8129                                          */
8130                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8131                                             chk->send_size, mtu);
8132                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8133                                 }
8134                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8135                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8136                                         struct sctp_data_chunk *dchkh;
8137
8138                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8139                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8140                                 }
8141                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8142                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8143                                         /* ok we will add this one */
8144
8145                                         /*
8146                                          * Add an AUTH chunk, if chunk
8147                                          * requires it, save the offset into
8148                                          * the chain for AUTH
8149                                          */
8150                                         if (data_auth_reqd) {
8151                                                 if (auth == NULL) {
8152                                                         outchain = sctp_add_auth_chunk(outchain,
8153                                                             &endoutchain,
8154                                                             &auth,
8155                                                             &auth_offset,
8156                                                             stcb,
8157                                                             SCTP_DATA);
8158                                                         auth_keyid = chk->auth_keyid;
8159                                                         override_ok = 0;
8160                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8161                                                 } else if (override_ok) {
8162                                                         /*
8163                                                          * use this data's
8164                                                          * keyid
8165                                                          */
8166                                                         auth_keyid = chk->auth_keyid;
8167                                                         override_ok = 0;
8168                                                 } else if (auth_keyid != chk->auth_keyid) {
8169                                                         /*
8170                                                          * different keyid,
8171                                                          * so done bundling
8172                                                          */
8173                                                         break;
8174                                                 }
8175                                         }
8176                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8177                                             chk->send_size, chk->copy_by_ref);
8178                                         if (outchain == NULL) {
8179                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8180                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8181                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8182                                                 }
8183                                                 *reason_code = 3;
8184                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8185                                                 return (ENOMEM);
8186                                         }
8187                                         /* upate our MTU size */
8188                                         /* Do clear IP_DF ? */
8189                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8190                                                 no_fragmentflg = 0;
8191                                         }
8192                                         /* unsigned subtraction of mtu */
8193                                         if (mtu > chk->send_size)
8194                                                 mtu -= chk->send_size;
8195                                         else
8196                                                 mtu = 0;
8197                                         /* unsigned subtraction of r_mtu */
8198                                         if (r_mtu > chk->send_size)
8199                                                 r_mtu -= chk->send_size;
8200                                         else
8201                                                 r_mtu = 0;
8202
8203                                         to_out += chk->send_size;
8204                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8205 #ifdef INVARIANTS
8206                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8207 #else
8208                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8209                                                     mx_mtu, to_out);
8210 #endif
8211                                         }
8212                                         chk->window_probe = 0;
8213                                         data_list[bundle_at++] = chk;
8214                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8215                                                 mtu = 0;
8216                                                 break;
8217                                         }
8218                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8219                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8220                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8221                                                 } else {
8222                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8223                                                 }
8224                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8225                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8226                                                         /*
8227                                                          * Count number of
8228                                                          * user msg's that
8229                                                          * were fragmented
8230                                                          * we do this by
8231                                                          * counting when we
8232                                                          * see a LAST
8233                                                          * fragment only.
8234                                                          */
8235                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8236                                         }
8237                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8238                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8239                                                         data_list[0]->window_probe = 1;
8240                                                         net->window_probe = 1;
8241                                                 }
8242                                                 break;
8243                                         }
8244                                 } else {
8245                                         /*
8246                                          * Must be sent in order of the
8247                                          * TSN's (on a network)
8248                                          */
8249                                         break;
8250                                 }
8251                         }       /* for (chunk gather loop for this net) */
8252                 }               /* if asoc.state OPEN */
8253 no_data_fill:
8254                 /* Is there something to send for this destination? */
8255                 if (outchain) {
8256                         /* We may need to start a control timer or two */
8257                         if (asconf) {
8258                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8259                                     stcb, net);
8260                                 /*
8261                                  * do NOT clear the asconf flag as it is
8262                                  * used to do appropriate source address
8263                                  * selection.
8264                                  */
8265                         }
8266                         if (cookie) {
8267                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8268                                 cookie = 0;
8269                         }
8270                         /* must start a send timer if data is being sent */
8271                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8272                                 /*
8273                                  * no timer running on this destination
8274                                  * restart it.
8275                                  */
8276                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8277                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8278                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8279                                     pf_hbflag &&
8280                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8281                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8282                                 /*
8283                                  * JRS 5/14/07 - If a HB has been sent to a
8284                                  * PF destination and no T3 timer is
8285                                  * currently running, start the T3 timer to
8286                                  * track the HBs that were sent.
8287                                  */
8288                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8289                         }
8290                         /* Now send it, if there is anything to send :> */
8291                         if ((error = sctp_lowlevel_chunk_output(inp,
8292                             stcb,
8293                             net,
8294                             (struct sockaddr *)&net->ro._l_addr,
8295                             outchain,
8296                             auth_offset,
8297                             auth,
8298                             auth_keyid,
8299                             no_fragmentflg,
8300                             bundle_at,
8301                             data_list[0],
8302                             asconf,
8303                             inp->sctp_lport, stcb->rport,
8304                             htonl(stcb->asoc.peer_vtag),
8305                             net->port, so_locked, NULL))) {
8306                                 /* error, we could not output */
8307                                 if (error == ENOBUFS) {
8308                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8309                                         asoc->ifp_had_enobuf = 1;
8310                                 }
8311                                 if (from_where == 0) {
8312                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8313                                 }
8314                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8315                                 if (hbflag) {
8316                                         if (*now_filled == 0) {
8317                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8318                                                 *now_filled = 1;
8319                                                 *now = net->last_sent_time;
8320                                         } else {
8321                                                 net->last_sent_time = *now;
8322                                         }
8323                                         hbflag = 0;
8324                                 }
8325                                 if (error == EHOSTUNREACH) {
8326                                         /*
8327                                          * Destination went unreachable
8328                                          * during this send
8329                                          */
8330                                         sctp_move_to_an_alt(stcb, asoc, net);
8331                                 }
8332                                 *reason_code = 6;
8333                                 /*-
8334                                  * I add this line to be paranoid. As far as
8335                                  * I can tell the continue, takes us back to
8336                                  * the top of the for, but just to make sure
8337                                  * I will reset these again here.
8338                                  */
8339                                 ctl_cnt = bundle_at = 0;
8340                                 continue;       /* This takes us back to the
8341                                                  * for() for the nets. */
8342                         } else {
8343                                 asoc->ifp_had_enobuf = 0;
8344                         }
8345                         outchain = endoutchain = NULL;
8346                         auth = NULL;
8347                         auth_offset = 0;
8348                         if (bundle_at || hbflag) {
8349                                 /* For data/asconf and hb set time */
8350                                 if (*now_filled == 0) {
8351                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8352                                         *now_filled = 1;
8353                                         *now = net->last_sent_time;
8354                                 } else {
8355                                         net->last_sent_time = *now;
8356                                 }
8357                         }
8358                         if (!no_out_cnt) {
8359                                 *num_out += (ctl_cnt + bundle_at);
8360                         }
8361                         if (bundle_at) {
8362                                 /* setup for a RTO measurement */
8363                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8364                                 /* fill time if not already filled */
8365                                 if (*now_filled == 0) {
8366                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8367                                         *now_filled = 1;
8368                                         *now = asoc->time_last_sent;
8369                                 } else {
8370                                         asoc->time_last_sent = *now;
8371                                 }
8372                                 data_list[0]->do_rtt = 1;
8373                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8374                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8375                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8376                                         if (net->flight_size < net->cwnd) {
8377                                                 /* start or restart it */
8378                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8379                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8380                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8381                                                 }
8382                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8383                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8384                                         } else {
8385                                                 /* stop it if its running */
8386                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8387                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8388                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8389                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8390                                                 }
8391                                         }
8392                                 }
8393                         }
8394                         if (one_chunk) {
8395                                 break;
8396                         }
8397                 }
8398                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8399                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8400                 }
8401         }
8402         if (old_start_at == NULL) {
8403                 old_start_at = start_at;
8404                 start_at = TAILQ_FIRST(&asoc->nets);
8405                 if (old_start_at)
8406                         goto again_one_more_time;
8407         }
8408         /*
8409          * At the end there should be no NON timed chunks hanging on this
8410          * queue.
8411          */
8412         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8413                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8414         }
8415         if ((*num_out == 0) && (*reason_code == 0)) {
8416                 *reason_code = 4;
8417         } else {
8418                 *reason_code = 5;
8419         }
8420         sctp_clean_up_ctl(stcb, asoc);
8421         return (0);
8422 }
8423
8424 void
8425 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8426 {
8427         /*-
8428          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8429          * the control chunk queue.
8430          */
8431         struct sctp_chunkhdr *hdr;
8432         struct sctp_tmit_chunk *chk;
8433         struct mbuf *mat;
8434
8435         SCTP_TCB_LOCK_ASSERT(stcb);
8436         sctp_alloc_a_chunk(stcb, chk);
8437         if (chk == NULL) {
8438                 /* no memory */
8439                 sctp_m_freem(op_err);
8440                 return;
8441         }
8442         chk->copy_by_ref = 0;
8443         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8444         if (op_err == NULL) {
8445                 sctp_free_a_chunk(stcb, chk);
8446                 return;
8447         }
8448         chk->send_size = 0;
8449         mat = op_err;
8450         while (mat != NULL) {
8451                 chk->send_size += SCTP_BUF_LEN(mat);
8452                 mat = SCTP_BUF_NEXT(mat);
8453         }
8454         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8455         chk->rec.chunk_id.can_take_data = 1;
8456         chk->sent = SCTP_DATAGRAM_UNSENT;
8457         chk->snd_count = 0;
8458         chk->flags = 0;
8459         chk->asoc = &stcb->asoc;
8460         chk->data = op_err;
8461         chk->whoTo = chk->asoc->primary_destination;
8462         atomic_add_int(&chk->whoTo->ref_count, 1);
8463         hdr = mtod(op_err, struct sctp_chunkhdr *);
8464         hdr->chunk_type = SCTP_OPERATION_ERROR;
8465         hdr->chunk_flags = 0;
8466         hdr->chunk_length = htons(chk->send_size);
8467         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8468             chk,
8469             sctp_next);
8470         chk->asoc->ctrl_queue_cnt++;
8471 }
8472
8473 int
8474 sctp_send_cookie_echo(struct mbuf *m,
8475     int offset,
8476     struct sctp_tcb *stcb,
8477     struct sctp_nets *net)
8478 {
8479         /*-
8480          * pull out the cookie and put it at the front of the control chunk
8481          * queue.
8482          */
8483         int at;
8484         struct mbuf *cookie;
8485         struct sctp_paramhdr parm, *phdr;
8486         struct sctp_chunkhdr *hdr;
8487         struct sctp_tmit_chunk *chk;
8488         uint16_t ptype, plen;
8489
8490         /* First find the cookie in the param area */
8491         cookie = NULL;
8492         at = offset + sizeof(struct sctp_init_chunk);
8493
8494         SCTP_TCB_LOCK_ASSERT(stcb);
8495         do {
8496                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8497                 if (phdr == NULL) {
8498                         return (-3);
8499                 }
8500                 ptype = ntohs(phdr->param_type);
8501                 plen = ntohs(phdr->param_length);
8502                 if (ptype == SCTP_STATE_COOKIE) {
8503                         int pad;
8504
8505                         /* found the cookie */
8506                         if ((pad = (plen % 4))) {
8507                                 plen += 4 - pad;
8508                         }
8509                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8510                         if (cookie == NULL) {
8511                                 /* No memory */
8512                                 return (-2);
8513                         }
8514 #ifdef SCTP_MBUF_LOGGING
8515                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8516                                 struct mbuf *mat;
8517
8518                                 mat = cookie;
8519                                 while (mat) {
8520                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8521                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8522                                         }
8523                                         mat = SCTP_BUF_NEXT(mat);
8524                                 }
8525                         }
8526 #endif
8527                         break;
8528                 }
8529                 at += SCTP_SIZE32(plen);
8530         } while (phdr);
8531         if (cookie == NULL) {
8532                 /* Did not find the cookie */
8533                 return (-3);
8534         }
8535         /* ok, we got the cookie lets change it into a cookie echo chunk */
8536
8537         /* first the change from param to cookie */
8538         hdr = mtod(cookie, struct sctp_chunkhdr *);
8539         hdr->chunk_type = SCTP_COOKIE_ECHO;
8540         hdr->chunk_flags = 0;
8541         /* get the chunk stuff now and place it in the FRONT of the queue */
8542         sctp_alloc_a_chunk(stcb, chk);
8543         if (chk == NULL) {
8544                 /* no memory */
8545                 sctp_m_freem(cookie);
8546                 return (-5);
8547         }
8548         chk->copy_by_ref = 0;
8549         chk->send_size = plen;
8550         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8551         chk->rec.chunk_id.can_take_data = 0;
8552         chk->sent = SCTP_DATAGRAM_UNSENT;
8553         chk->snd_count = 0;
8554         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8555         chk->asoc = &stcb->asoc;
8556         chk->data = cookie;
8557         chk->whoTo = chk->asoc->primary_destination;
8558         atomic_add_int(&chk->whoTo->ref_count, 1);
8559         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8560         chk->asoc->ctrl_queue_cnt++;
8561         return (0);
8562 }
8563
8564 void
8565 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8566     struct mbuf *m,
8567     int offset,
8568     int chk_length,
8569     struct sctp_nets *net)
8570 {
8571         /*
8572          * take a HB request and make it into a HB ack and send it.
8573          */
8574         struct mbuf *outchain;
8575         struct sctp_chunkhdr *chdr;
8576         struct sctp_tmit_chunk *chk;
8577
8578
8579         if (net == NULL)
8580                 /* must have a net pointer */
8581                 return;
8582
8583         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8584         if (outchain == NULL) {
8585                 /* gak out of memory */
8586                 return;
8587         }
8588 #ifdef SCTP_MBUF_LOGGING
8589         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8590                 struct mbuf *mat;
8591
8592                 mat = outchain;
8593                 while (mat) {
8594                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8595                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8596                         }
8597                         mat = SCTP_BUF_NEXT(mat);
8598                 }
8599         }
8600 #endif
8601         chdr = mtod(outchain, struct sctp_chunkhdr *);
8602         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8603         chdr->chunk_flags = 0;
8604         if (chk_length % 4) {
8605                 /* need pad */
8606                 uint32_t cpthis = 0;
8607                 int padlen;
8608
8609                 padlen = 4 - (chk_length % 4);
8610                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8611         }
8612         sctp_alloc_a_chunk(stcb, chk);
8613         if (chk == NULL) {
8614                 /* no memory */
8615                 sctp_m_freem(outchain);
8616                 return;
8617         }
8618         chk->copy_by_ref = 0;
8619         chk->send_size = chk_length;
8620         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8621         chk->rec.chunk_id.can_take_data = 1;
8622         chk->sent = SCTP_DATAGRAM_UNSENT;
8623         chk->snd_count = 0;
8624         chk->flags = 0;
8625         chk->asoc = &stcb->asoc;
8626         chk->data = outchain;
8627         chk->whoTo = net;
8628         atomic_add_int(&chk->whoTo->ref_count, 1);
8629         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8630         chk->asoc->ctrl_queue_cnt++;
8631 }
8632
8633 void
8634 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8635 {
8636         /* formulate and queue a cookie-ack back to sender */
8637         struct mbuf *cookie_ack;
8638         struct sctp_chunkhdr *hdr;
8639         struct sctp_tmit_chunk *chk;
8640
8641         cookie_ack = NULL;
8642         SCTP_TCB_LOCK_ASSERT(stcb);
8643
8644         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8645         if (cookie_ack == NULL) {
8646                 /* no mbuf's */
8647                 return;
8648         }
8649         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8650         sctp_alloc_a_chunk(stcb, chk);
8651         if (chk == NULL) {
8652                 /* no memory */
8653                 sctp_m_freem(cookie_ack);
8654                 return;
8655         }
8656         chk->copy_by_ref = 0;
8657         chk->send_size = sizeof(struct sctp_chunkhdr);
8658         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8659         chk->rec.chunk_id.can_take_data = 1;
8660         chk->sent = SCTP_DATAGRAM_UNSENT;
8661         chk->snd_count = 0;
8662         chk->flags = 0;
8663         chk->asoc = &stcb->asoc;
8664         chk->data = cookie_ack;
8665         if (chk->asoc->last_control_chunk_from != NULL) {
8666                 chk->whoTo = chk->asoc->last_control_chunk_from;
8667         } else {
8668                 chk->whoTo = chk->asoc->primary_destination;
8669         }
8670         atomic_add_int(&chk->whoTo->ref_count, 1);
8671         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8672         hdr->chunk_type = SCTP_COOKIE_ACK;
8673         hdr->chunk_flags = 0;
8674         hdr->chunk_length = htons(chk->send_size);
8675         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8676         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8677         chk->asoc->ctrl_queue_cnt++;
8678         return;
8679 }
8680
8681
8682 void
8683 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8684 {
8685         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8686         struct mbuf *m_shutdown_ack;
8687         struct sctp_shutdown_ack_chunk *ack_cp;
8688         struct sctp_tmit_chunk *chk;
8689
8690         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8691         if (m_shutdown_ack == NULL) {
8692                 /* no mbuf's */
8693                 return;
8694         }
8695         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8696         sctp_alloc_a_chunk(stcb, chk);
8697         if (chk == NULL) {
8698                 /* no memory */
8699                 sctp_m_freem(m_shutdown_ack);
8700                 return;
8701         }
8702         chk->copy_by_ref = 0;
8703         chk->send_size = sizeof(struct sctp_chunkhdr);
8704         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8705         chk->rec.chunk_id.can_take_data = 1;
8706         chk->sent = SCTP_DATAGRAM_UNSENT;
8707         chk->snd_count = 0;
8708         chk->flags = 0;
8709         chk->asoc = &stcb->asoc;
8710         chk->data = m_shutdown_ack;
8711         chk->whoTo = net;
8712         atomic_add_int(&net->ref_count, 1);
8713
8714         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8715         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8716         ack_cp->ch.chunk_flags = 0;
8717         ack_cp->ch.chunk_length = htons(chk->send_size);
8718         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8719         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8720         chk->asoc->ctrl_queue_cnt++;
8721         return;
8722 }
8723
8724 void
8725 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8726 {
8727         /* formulate and queue a SHUTDOWN to the sender */
8728         struct mbuf *m_shutdown;
8729         struct sctp_shutdown_chunk *shutdown_cp;
8730         struct sctp_tmit_chunk *chk;
8731
8732         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8733         if (m_shutdown == NULL) {
8734                 /* no mbuf's */
8735                 return;
8736         }
8737         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8738         sctp_alloc_a_chunk(stcb, chk);
8739         if (chk == NULL) {
8740                 /* no memory */
8741                 sctp_m_freem(m_shutdown);
8742                 return;
8743         }
8744         chk->copy_by_ref = 0;
8745         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8746         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8747         chk->rec.chunk_id.can_take_data = 1;
8748         chk->sent = SCTP_DATAGRAM_UNSENT;
8749         chk->snd_count = 0;
8750         chk->flags = 0;
8751         chk->asoc = &stcb->asoc;
8752         chk->data = m_shutdown;
8753         chk->whoTo = net;
8754         atomic_add_int(&net->ref_count, 1);
8755
8756         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8757         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8758         shutdown_cp->ch.chunk_flags = 0;
8759         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8760         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8761         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8762         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8763         chk->asoc->ctrl_queue_cnt++;
8764         return;
8765 }
8766
8767 void
8768 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8769 {
8770         /*
8771          * formulate and queue an ASCONF to the peer. ASCONF parameters
8772          * should be queued on the assoc queue.
8773          */
8774         struct sctp_tmit_chunk *chk;
8775         struct mbuf *m_asconf;
8776         int len;
8777
8778         SCTP_TCB_LOCK_ASSERT(stcb);
8779
8780         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8781             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8782                 /* can't send a new one if there is one in flight already */
8783                 return;
8784         }
8785         /* compose an ASCONF chunk, maximum length is PMTU */
8786         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8787         if (m_asconf == NULL) {
8788                 return;
8789         }
8790         sctp_alloc_a_chunk(stcb, chk);
8791         if (chk == NULL) {
8792                 /* no memory */
8793                 sctp_m_freem(m_asconf);
8794                 return;
8795         }
8796         chk->copy_by_ref = 0;
8797         chk->data = m_asconf;
8798         chk->send_size = len;
8799         chk->rec.chunk_id.id = SCTP_ASCONF;
8800         chk->rec.chunk_id.can_take_data = 0;
8801         chk->sent = SCTP_DATAGRAM_UNSENT;
8802         chk->snd_count = 0;
8803         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8804         chk->asoc = &stcb->asoc;
8805         chk->whoTo = net;
8806         atomic_add_int(&chk->whoTo->ref_count, 1);
8807         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8808         chk->asoc->ctrl_queue_cnt++;
8809         return;
8810 }
8811
8812 void
8813 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8814 {
8815         /*
8816          * formulate and queue a asconf-ack back to sender. the asconf-ack
8817          * must be stored in the tcb.
8818          */
8819         struct sctp_tmit_chunk *chk;
8820         struct sctp_asconf_ack *ack, *latest_ack;
8821         struct mbuf *m_ack, *m;
8822         struct sctp_nets *net = NULL;
8823
8824         SCTP_TCB_LOCK_ASSERT(stcb);
8825         /* Get the latest ASCONF-ACK */
8826         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8827         if (latest_ack == NULL) {
8828                 return;
8829         }
8830         if (latest_ack->last_sent_to != NULL &&
8831             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8832                 /* we're doing a retransmission */
8833                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8834                 if (net == NULL) {
8835                         /* no alternate */
8836                         if (stcb->asoc.last_control_chunk_from == NULL)
8837                                 net = stcb->asoc.primary_destination;
8838                         else
8839                                 net = stcb->asoc.last_control_chunk_from;
8840                 }
8841         } else {
8842                 /* normal case */
8843                 if (stcb->asoc.last_control_chunk_from == NULL)
8844                         net = stcb->asoc.primary_destination;
8845                 else
8846                         net = stcb->asoc.last_control_chunk_from;
8847         }
8848         latest_ack->last_sent_to = net;
8849
8850         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8851                 if (ack->data == NULL) {
8852                         continue;
8853                 }
8854                 /* copy the asconf_ack */
8855                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8856                 if (m_ack == NULL) {
8857                         /* couldn't copy it */
8858                         return;
8859                 }
8860 #ifdef SCTP_MBUF_LOGGING
8861                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8862                         struct mbuf *mat;
8863
8864                         mat = m_ack;
8865                         while (mat) {
8866                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8867                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8868                                 }
8869                                 mat = SCTP_BUF_NEXT(mat);
8870                         }
8871                 }
8872 #endif
8873
8874                 sctp_alloc_a_chunk(stcb, chk);
8875                 if (chk == NULL) {
8876                         /* no memory */
8877                         if (m_ack)
8878                                 sctp_m_freem(m_ack);
8879                         return;
8880                 }
8881                 chk->copy_by_ref = 0;
8882
8883                 chk->whoTo = net;
8884                 chk->data = m_ack;
8885                 chk->send_size = 0;
8886                 /* Get size */
8887                 m = m_ack;
8888                 chk->send_size = ack->len;
8889                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8890                 chk->rec.chunk_id.can_take_data = 1;
8891                 chk->sent = SCTP_DATAGRAM_UNSENT;
8892                 chk->snd_count = 0;
8893                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8894                 chk->asoc = &stcb->asoc;
8895                 atomic_add_int(&chk->whoTo->ref_count, 1);
8896
8897                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8898                 chk->asoc->ctrl_queue_cnt++;
8899         }
8900         return;
8901 }
8902
8903
8904 static int
8905 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8906     struct sctp_tcb *stcb,
8907     struct sctp_association *asoc,
8908     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8909 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8910     SCTP_UNUSED
8911 #endif
8912 )
8913 {
8914         /*-
8915          * send out one MTU of retransmission. If fast_retransmit is
8916          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8917          * rwnd. For a Cookie or Asconf in the control chunk queue we
8918          * retransmit them by themselves.
8919          *
8920          * For data chunks we will pick out the lowest TSN's in the sent_queue
8921          * marked for resend and bundle them all together (up to a MTU of
8922          * destination). The address to send to should have been
8923          * selected/changed where the retransmission was marked (i.e. in FR
8924          * or t3-timeout routines).
8925          */
8926         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8927         struct sctp_tmit_chunk *chk, *fwd;
8928         struct mbuf *m, *endofchain;
8929         struct sctp_nets *net = NULL;
8930         uint32_t tsns_sent = 0;
8931         int no_fragmentflg, bundle_at, cnt_thru;
8932         unsigned int mtu;
8933         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8934         struct sctp_auth_chunk *auth = NULL;
8935         uint32_t auth_offset = 0;
8936         uint16_t auth_keyid;
8937         int override_ok = 1;
8938         int data_auth_reqd = 0;
8939         uint32_t dmtu = 0;
8940
8941         SCTP_TCB_LOCK_ASSERT(stcb);
8942         tmr_started = ctl_cnt = bundle_at = error = 0;
8943         no_fragmentflg = 1;
8944         fwd_tsn = 0;
8945         *cnt_out = 0;
8946         fwd = NULL;
8947         endofchain = m = NULL;
8948         auth_keyid = stcb->asoc.authinfo.active_keyid;
8949 #ifdef SCTP_AUDITING_ENABLED
8950         sctp_audit_log(0xC3, 1);
8951 #endif
8952         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8953             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8954                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8955                     asoc->sent_queue_retran_cnt);
8956                 asoc->sent_queue_cnt = 0;
8957                 asoc->sent_queue_cnt_removeable = 0;
8958                 /* send back 0/0 so we enter normal transmission */
8959                 *cnt_out = 0;
8960                 return (0);
8961         }
8962         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8963                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8964                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8965                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8966                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8967                                 if (chk != asoc->str_reset) {
8968                                         /*
8969                                          * not eligible for retran if its
8970                                          * not ours
8971                                          */
8972                                         continue;
8973                                 }
8974                         }
8975                         ctl_cnt++;
8976                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8977                                 fwd_tsn = 1;
8978                                 fwd = chk;
8979                         }
8980                         /*
8981                          * Add an AUTH chunk, if chunk requires it save the
8982                          * offset into the chain for AUTH
8983                          */
8984                         if ((auth == NULL) &&
8985                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8986                             stcb->asoc.peer_auth_chunks))) {
8987                                 m = sctp_add_auth_chunk(m, &endofchain,
8988                                     &auth, &auth_offset,
8989                                     stcb,
8990                                     chk->rec.chunk_id.id);
8991                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8992                         }
8993                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8994                         break;
8995                 }
8996         }
8997         one_chunk = 0;
8998         cnt_thru = 0;
8999         /* do we have control chunks to retransmit? */
9000         if (m != NULL) {
9001                 /* Start a timer no matter if we suceed or fail */
9002                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9003                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9004                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9005                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9006                 chk->snd_count++;       /* update our count */
9007                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9008                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9009                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9010                     no_fragmentflg, 0, NULL, 0,
9011                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9012                     chk->whoTo->port, so_locked, NULL))) {
9013                         SCTP_STAT_INCR(sctps_lowlevelerr);
9014                         return (error);
9015                 }
9016                 m = endofchain = NULL;
9017                 auth = NULL;
9018                 auth_offset = 0;
9019                 /*
9020                  * We don't want to mark the net->sent time here since this
9021                  * we use this for HB and retrans cannot measure RTT
9022                  */
9023                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9024                 *cnt_out += 1;
9025                 chk->sent = SCTP_DATAGRAM_SENT;
9026                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9027                 if (fwd_tsn == 0) {
9028                         return (0);
9029                 } else {
9030                         /* Clean up the fwd-tsn list */
9031                         sctp_clean_up_ctl(stcb, asoc);
9032                         return (0);
9033                 }
9034         }
9035         /*
9036          * Ok, it is just data retransmission we need to do or that and a
9037          * fwd-tsn with it all.
9038          */
9039         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9040                 return (SCTP_RETRAN_DONE);
9041         }
9042         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9043             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9044                 /* not yet open, resend the cookie and that is it */
9045                 return (1);
9046         }
9047 #ifdef SCTP_AUDITING_ENABLED
9048         sctp_auditing(20, inp, stcb, NULL);
9049 #endif
9050         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9051         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9052                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9053                         /* No, not sent to this net or not ready for rtx */
9054                         continue;
9055                 }
9056                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9057                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9058                         /* Gak, we have exceeded max unlucky retran, abort! */
9059                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9060                             chk->snd_count,
9061                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9062                         atomic_add_int(&stcb->asoc.refcnt, 1);
9063                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9064                         SCTP_TCB_LOCK(stcb);
9065                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9066                         return (SCTP_RETRAN_EXIT);
9067                 }
9068                 /* pick up the net */
9069                 net = chk->whoTo;
9070                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9071                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9072                 } else {
9073                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9074                 }
9075
9076                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9077                         /* No room in peers rwnd */
9078                         uint32_t tsn;
9079
9080                         tsn = asoc->last_acked_seq + 1;
9081                         if (tsn == chk->rec.data.TSN_seq) {
9082                                 /*
9083                                  * we make a special exception for this
9084                                  * case. The peer has no rwnd but is missing
9085                                  * the lowest chunk.. which is probably what
9086                                  * is holding up the rwnd.
9087                                  */
9088                                 goto one_chunk_around;
9089                         }
9090                         return (1);
9091                 }
9092 one_chunk_around:
9093                 if (asoc->peers_rwnd < mtu) {
9094                         one_chunk = 1;
9095                         if ((asoc->peers_rwnd == 0) &&
9096                             (asoc->total_flight == 0)) {
9097                                 chk->window_probe = 1;
9098                                 chk->whoTo->window_probe = 1;
9099                         }
9100                 }
9101 #ifdef SCTP_AUDITING_ENABLED
9102                 sctp_audit_log(0xC3, 2);
9103 #endif
9104                 bundle_at = 0;
9105                 m = NULL;
9106                 net->fast_retran_ip = 0;
9107                 if (chk->rec.data.doing_fast_retransmit == 0) {
9108                         /*
9109                          * if no FR in progress skip destination that have
9110                          * flight_size > cwnd.
9111                          */
9112                         if (net->flight_size >= net->cwnd) {
9113                                 continue;
9114                         }
9115                 } else {
9116                         /*
9117                          * Mark the destination net to have FR recovery
9118                          * limits put on it.
9119                          */
9120                         *fr_done = 1;
9121                         net->fast_retran_ip = 1;
9122                 }
9123
9124                 /*
9125                  * if no AUTH is yet included and this chunk requires it,
9126                  * make sure to account for it.  We don't apply the size
9127                  * until the AUTH chunk is actually added below in case
9128                  * there is no room for this chunk.
9129                  */
9130                 if (data_auth_reqd && (auth == NULL)) {
9131                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9132                 } else
9133                         dmtu = 0;
9134
9135                 if ((chk->send_size <= (mtu - dmtu)) ||
9136                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9137                         /* ok we will add this one */
9138                         if (data_auth_reqd) {
9139                                 if (auth == NULL) {
9140                                         m = sctp_add_auth_chunk(m,
9141                                             &endofchain,
9142                                             &auth,
9143                                             &auth_offset,
9144                                             stcb,
9145                                             SCTP_DATA);
9146                                         auth_keyid = chk->auth_keyid;
9147                                         override_ok = 0;
9148                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9149                                 } else if (override_ok) {
9150                                         auth_keyid = chk->auth_keyid;
9151                                         override_ok = 0;
9152                                 } else if (chk->auth_keyid != auth_keyid) {
9153                                         /* different keyid, so done bundling */
9154                                         break;
9155                                 }
9156                         }
9157                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9158                         if (m == NULL) {
9159                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9160                                 return (ENOMEM);
9161                         }
9162                         /* Do clear IP_DF ? */
9163                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9164                                 no_fragmentflg = 0;
9165                         }
9166                         /* upate our MTU size */
9167                         if (mtu > (chk->send_size + dmtu))
9168                                 mtu -= (chk->send_size + dmtu);
9169                         else
9170                                 mtu = 0;
9171                         data_list[bundle_at++] = chk;
9172                         if (one_chunk && (asoc->total_flight <= 0)) {
9173                                 SCTP_STAT_INCR(sctps_windowprobed);
9174                         }
9175                 }
9176                 if (one_chunk == 0) {
9177                         /*
9178                          * now are there anymore forward from chk to pick
9179                          * up?
9180                          */
9181                         fwd = TAILQ_NEXT(chk, sctp_next);
9182                         while (fwd) {
9183                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9184                                         /* Nope, not for retran */
9185                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9186                                         continue;
9187                                 }
9188                                 if (fwd->whoTo != net) {
9189                                         /* Nope, not the net in question */
9190                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9191                                         continue;
9192                                 }
9193                                 if (data_auth_reqd && (auth == NULL)) {
9194                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9195                                 } else
9196                                         dmtu = 0;
9197                                 if (fwd->send_size <= (mtu - dmtu)) {
9198                                         if (data_auth_reqd) {
9199                                                 if (auth == NULL) {
9200                                                         m = sctp_add_auth_chunk(m,
9201                                                             &endofchain,
9202                                                             &auth,
9203                                                             &auth_offset,
9204                                                             stcb,
9205                                                             SCTP_DATA);
9206                                                         auth_keyid = fwd->auth_keyid;
9207                                                         override_ok = 0;
9208                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9209                                                 } else if (override_ok) {
9210                                                         auth_keyid = fwd->auth_keyid;
9211                                                         override_ok = 0;
9212                                                 } else if (fwd->auth_keyid != auth_keyid) {
9213                                                         /*
9214                                                          * different keyid,
9215                                                          * so done bundling
9216                                                          */
9217                                                         break;
9218                                                 }
9219                                         }
9220                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9221                                         if (m == NULL) {
9222                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9223                                                 return (ENOMEM);
9224                                         }
9225                                         /* Do clear IP_DF ? */
9226                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9227                                                 no_fragmentflg = 0;
9228                                         }
9229                                         /* upate our MTU size */
9230                                         if (mtu > (fwd->send_size + dmtu))
9231                                                 mtu -= (fwd->send_size + dmtu);
9232                                         else
9233                                                 mtu = 0;
9234                                         data_list[bundle_at++] = fwd;
9235                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9236                                                 break;
9237                                         }
9238                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9239                                 } else {
9240                                         /* can't fit so we are done */
9241                                         break;
9242                                 }
9243                         }
9244                 }
9245                 /* Is there something to send for this destination? */
9246                 if (m) {
9247                         /*
9248                          * No matter if we fail/or suceed we should start a
9249                          * timer. A failure is like a lost IP packet :-)
9250                          */
9251                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9252                                 /*
9253                                  * no timer running on this destination
9254                                  * restart it.
9255                                  */
9256                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9257                                 tmr_started = 1;
9258                         }
9259                         /* Now lets send it, if there is anything to send :> */
9260                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9261                             (struct sockaddr *)&net->ro._l_addr, m,
9262                             auth_offset, auth, auth_keyid,
9263                             no_fragmentflg, 0, NULL, 0,
9264                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9265                             net->port, so_locked, NULL))) {
9266                                 /* error, we could not output */
9267                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9268                                 return (error);
9269                         }
9270                         m = endofchain = NULL;
9271                         auth = NULL;
9272                         auth_offset = 0;
9273                         /* For HB's */
9274                         /*
9275                          * We don't want to mark the net->sent time here
9276                          * since this we use this for HB and retrans cannot
9277                          * measure RTT
9278                          */
9279                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9280
9281                         /* For auto-close */
9282                         cnt_thru++;
9283                         if (*now_filled == 0) {
9284                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9285                                 *now = asoc->time_last_sent;
9286                                 *now_filled = 1;
9287                         } else {
9288                                 asoc->time_last_sent = *now;
9289                         }
9290                         *cnt_out += bundle_at;
9291 #ifdef SCTP_AUDITING_ENABLED
9292                         sctp_audit_log(0xC4, bundle_at);
9293 #endif
9294                         if (bundle_at) {
9295                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9296                         }
9297                         for (i = 0; i < bundle_at; i++) {
9298                                 SCTP_STAT_INCR(sctps_sendretransdata);
9299                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9300                                 /*
9301                                  * When we have a revoked data, and we
9302                                  * retransmit it, then we clear the revoked
9303                                  * flag since this flag dictates if we
9304                                  * subtracted from the fs
9305                                  */
9306                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9307                                         /* Deflate the cwnd */
9308                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9309                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9310                                 }
9311                                 data_list[i]->snd_count++;
9312                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9313                                 /* record the time */
9314                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9315                                 if (data_list[i]->book_size_scale) {
9316                                         /*
9317                                          * need to double the book size on
9318                                          * this one
9319                                          */
9320                                         data_list[i]->book_size_scale = 0;
9321                                         /*
9322                                          * Since we double the booksize, we
9323                                          * must also double the output queue
9324                                          * size, since this get shrunk when
9325                                          * we free by this amount.
9326                                          */
9327                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9328                                         data_list[i]->book_size *= 2;
9329
9330
9331                                 } else {
9332                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9333                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9334                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9335                                         }
9336                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9337                                             (uint32_t) (data_list[i]->send_size +
9338                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9339                                 }
9340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9341                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9342                                             data_list[i]->whoTo->flight_size,
9343                                             data_list[i]->book_size,
9344                                             (uintptr_t) data_list[i]->whoTo,
9345                                             data_list[i]->rec.data.TSN_seq);
9346                                 }
9347                                 sctp_flight_size_increase(data_list[i]);
9348                                 sctp_total_flight_increase(stcb, data_list[i]);
9349                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9350                                         /* SWS sender side engages */
9351                                         asoc->peers_rwnd = 0;
9352                                 }
9353                                 if ((i == 0) &&
9354                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9355                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9356                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9357                                             (tmr_started == 0)) {
9358                                                 /*-
9359                                                  * ok we just fast-retrans'd
9360                                                  * the lowest TSN, i.e the
9361                                                  * first on the list. In
9362                                                  * this case we want to give
9363                                                  * some more time to get a
9364                                                  * SACK back without a
9365                                                  * t3-expiring.
9366                                                  */
9367                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9368                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9369                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9370                                         }
9371                                 }
9372                         }
9373                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9374                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9375                         }
9376 #ifdef SCTP_AUDITING_ENABLED
9377                         sctp_auditing(21, inp, stcb, NULL);
9378 #endif
9379                 } else {
9380                         /* None will fit */
9381                         return (1);
9382                 }
9383                 if (asoc->sent_queue_retran_cnt <= 0) {
9384                         /* all done we have no more to retran */
9385                         asoc->sent_queue_retran_cnt = 0;
9386                         break;
9387                 }
9388                 if (one_chunk) {
9389                         /* No more room in rwnd */
9390                         return (1);
9391                 }
9392                 /* stop the for loop here. we sent out a packet */
9393                 break;
9394         }
9395         return (0);
9396 }
9397
9398
9399 static int
9400 sctp_timer_validation(struct sctp_inpcb *inp,
9401     struct sctp_tcb *stcb,
9402     struct sctp_association *asoc,
9403     int ret)
9404 {
9405         struct sctp_nets *net;
9406
9407         /* Validate that a timer is running somewhere */
9408         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9409                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9410                         /* Here is a timer */
9411                         return (ret);
9412                 }
9413         }
9414         SCTP_TCB_LOCK_ASSERT(stcb);
9415         /* Gak, we did not have a timer somewhere */
9416         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9417         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9418         return (ret);
9419 }
9420
9421 void
9422 sctp_chunk_output(struct sctp_inpcb *inp,
9423     struct sctp_tcb *stcb,
9424     int from_where,
9425     int so_locked
9426 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9427     SCTP_UNUSED
9428 #endif
9429 )
9430 {
9431         /*-
9432          * Ok this is the generic chunk service queue. we must do the
9433          * following:
9434          * - See if there are retransmits pending, if so we must
9435          *   do these first.
9436          * - Service the stream queue that is next, moving any
9437          *   message (note I must get a complete message i.e.
9438          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9439          *   TSN's
9440          * - Check to see if the cwnd/rwnd allows any output, if so we
9441          *   go ahead and fomulate and send the low level chunks. Making sure
9442          *   to combine any control in the control chunk queue also.
9443          */
9444         struct sctp_association *asoc;
9445         struct sctp_nets *net;
9446         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9447             burst_cnt = 0, burst_limit = 0;
9448         struct timeval now;
9449         int now_filled = 0;
9450         int nagle_on = 0;
9451         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9452         int un_sent = 0;
9453         int fr_done, tot_frs = 0;
9454
9455         asoc = &stcb->asoc;
9456         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9457                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9458                         nagle_on = 0;
9459                 } else {
9460                         nagle_on = 1;
9461                 }
9462         }
9463         SCTP_TCB_LOCK_ASSERT(stcb);
9464
9465         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9466
9467         if ((un_sent <= 0) &&
9468             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9469             (asoc->sent_queue_retran_cnt == 0)) {
9470                 /* Nothing to do unless there is something to be sent left */
9471                 return;
9472         }
9473         /*
9474          * Do we have something to send, data or control AND a sack timer
9475          * running, if so piggy-back the sack.
9476          */
9477         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9478                 /*
9479                  * EY if nr_sacks used then send an nr-sack , a sack
9480                  * otherwise
9481                  */
9482                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack)
9483                         sctp_send_nr_sack(stcb);
9484                 else
9485                         sctp_send_sack(stcb);
9486                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9487         }
9488         while (asoc->sent_queue_retran_cnt) {
9489                 /*-
9490                  * Ok, it is retransmission time only, we send out only ONE
9491                  * packet with a single call off to the retran code.
9492                  */
9493                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9494                         /*-
9495                          * Special hook for handling cookiess discarded
9496                          * by peer that carried data. Send cookie-ack only
9497                          * and then the next call with get the retran's.
9498                          */
9499                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9500                             from_where,
9501                             &now, &now_filled, frag_point, so_locked);
9502                         return;
9503                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9504                         /* if its not from a HB then do it */
9505                         fr_done = 0;
9506                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9507                         if (fr_done) {
9508                                 tot_frs++;
9509                         }
9510                 } else {
9511                         /*
9512                          * its from any other place, we don't allow retran
9513                          * output (only control)
9514                          */
9515                         ret = 1;
9516                 }
9517                 if (ret > 0) {
9518                         /* Can't send anymore */
9519                         /*-
9520                          * now lets push out control by calling med-level
9521                          * output once. this assures that we WILL send HB's
9522                          * if queued too.
9523                          */
9524                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9525                             from_where,
9526                             &now, &now_filled, frag_point, so_locked);
9527 #ifdef SCTP_AUDITING_ENABLED
9528                         sctp_auditing(8, inp, stcb, NULL);
9529 #endif
9530                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9531                         return;
9532                 }
9533                 if (ret < 0) {
9534                         /*-
9535                          * The count was off.. retran is not happening so do
9536                          * the normal retransmission.
9537                          */
9538 #ifdef SCTP_AUDITING_ENABLED
9539                         sctp_auditing(9, inp, stcb, NULL);
9540 #endif
9541                         if (ret == SCTP_RETRAN_EXIT) {
9542                                 return;
9543                         }
9544                         break;
9545                 }
9546                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9547                         /* Only one transmission allowed out of a timeout */
9548 #ifdef SCTP_AUDITING_ENABLED
9549                         sctp_auditing(10, inp, stcb, NULL);
9550 #endif
9551                         /* Push out any control */
9552                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9553                             &now, &now_filled, frag_point, so_locked);
9554                         return;
9555                 }
9556                 if (tot_frs > asoc->max_burst) {
9557                         /* Hit FR burst limit */
9558                         return;
9559                 }
9560                 if ((num_out == 0) && (ret == 0)) {
9561
9562                         /* No more retrans to send */
9563                         break;
9564                 }
9565         }
9566 #ifdef SCTP_AUDITING_ENABLED
9567         sctp_auditing(12, inp, stcb, NULL);
9568 #endif
9569         /* Check for bad destinations, if they exist move chunks around. */
9570         burst_limit = asoc->max_burst;
9571         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9572                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9573                     SCTP_ADDR_NOT_REACHABLE) {
9574                         /*-
9575                          * if possible move things off of this address we
9576                          * still may send below due to the dormant state but
9577                          * we try to find an alternate address to send to
9578                          * and if we have one we move all queued data on the
9579                          * out wheel to this alternate address.
9580                          */
9581                         if (net->ref_count > 1)
9582                                 sctp_move_to_an_alt(stcb, asoc, net);
9583                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9584                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9585                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9586                         /*
9587                          * JRS 5/14/07 - If CMT PF is on and the current
9588                          * destination is in PF state, move all queued data
9589                          * to an alternate desination.
9590                          */
9591                         if (net->ref_count > 1)
9592                                 sctp_move_to_an_alt(stcb, asoc, net);
9593                 } else {
9594                         /*-
9595                          * if ((asoc->sat_network) || (net->addr_is_local))
9596                          * { burst_limit = asoc->max_burst *
9597                          * SCTP_SAT_NETWORK_BURST_INCR; }
9598                          */
9599                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9600                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9601                                         /*
9602                                          * JRS - Use the congestion control
9603                                          * given in the congestion control
9604                                          * module
9605                                          */
9606                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9607                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9608                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9609                                         }
9610                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9611                                 }
9612                                 net->fast_retran_ip = 0;
9613                         } else {
9614                                 if (net->flight_size == 0) {
9615                                         /* Should be decaying the cwnd here */
9616                                         ;
9617                                 }
9618                         }
9619                 }
9620
9621         }
9622         burst_cnt = 0;
9623         do {
9624                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9625                     &reason_code, 0, from_where,
9626                     &now, &now_filled, frag_point, so_locked);
9627                 if (error) {
9628                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9629                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9630                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9631                         }
9632                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9633                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9634                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9635                         }
9636                         break;
9637                 }
9638                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9639
9640                 tot_out += num_out;
9641                 burst_cnt++;
9642                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9643                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9644                         if (num_out == 0) {
9645                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9646                         }
9647                 }
9648                 if (nagle_on) {
9649                         /*-
9650                          * When nagle is on, we look at how much is un_sent, then
9651                          * if its smaller than an MTU and we have data in
9652                          * flight we stop.
9653                          */
9654                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9655                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9656                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9657                             (stcb->asoc.total_flight > 0)) {
9658                                 break;
9659                         }
9660                 }
9661                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9662                     TAILQ_EMPTY(&asoc->send_queue) &&
9663                     TAILQ_EMPTY(&asoc->out_wheel)) {
9664                         /* Nothing left to send */
9665                         break;
9666                 }
9667                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9668                         /* Nothing left to send */
9669                         break;
9670                 }
9671         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9672             (burst_cnt < burst_limit)));
9673
9674         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9675                 if (burst_cnt >= burst_limit) {
9676                         SCTP_STAT_INCR(sctps_maxburstqueued);
9677                         asoc->burst_limit_applied = 1;
9678                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9679                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9680                         }
9681                 } else {
9682                         asoc->burst_limit_applied = 0;
9683                 }
9684         }
9685         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9686                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9687         }
9688         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9689             tot_out);
9690
9691         /*-
9692          * Now we need to clean up the control chunk chain if a ECNE is on
9693          * it. It must be marked as UNSENT again so next call will continue
9694          * to send it until such time that we get a CWR, to remove it.
9695          */
9696         if (stcb->asoc.ecn_echo_cnt_onq)
9697                 sctp_fix_ecn_echo(asoc);
9698         return;
9699 }
9700
9701
9702 int
9703 sctp_output(inp, m, addr, control, p, flags)
9704         struct sctp_inpcb *inp;
9705         struct mbuf *m;
9706         struct sockaddr *addr;
9707         struct mbuf *control;
9708         struct thread *p;
9709         int flags;
9710 {
9711         if (inp == NULL) {
9712                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9713                 return (EINVAL);
9714         }
9715         if (inp->sctp_socket == NULL) {
9716                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9717                 return (EINVAL);
9718         }
9719         return (sctp_sosend(inp->sctp_socket,
9720             addr,
9721             (struct uio *)NULL,
9722             m,
9723             control,
9724             flags, p
9725             ));
9726 }
9727
9728 void
9729 send_forward_tsn(struct sctp_tcb *stcb,
9730     struct sctp_association *asoc)
9731 {
9732         struct sctp_tmit_chunk *chk;
9733         struct sctp_forward_tsn_chunk *fwdtsn;
9734         uint32_t advance_peer_ack_point;
9735
9736         SCTP_TCB_LOCK_ASSERT(stcb);
9737         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9738                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9739                         /* mark it to unsent */
9740                         chk->sent = SCTP_DATAGRAM_UNSENT;
9741                         chk->snd_count = 0;
9742                         /* Do we correct its output location? */
9743                         if (chk->whoTo != asoc->primary_destination) {
9744                                 sctp_free_remote_addr(chk->whoTo);
9745                                 chk->whoTo = asoc->primary_destination;
9746                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9747                         }
9748                         goto sctp_fill_in_rest;
9749                 }
9750         }
9751         /* Ok if we reach here we must build one */
9752         sctp_alloc_a_chunk(stcb, chk);
9753         if (chk == NULL) {
9754                 return;
9755         }
9756         chk->copy_by_ref = 0;
9757         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9758         chk->rec.chunk_id.can_take_data = 0;
9759         chk->asoc = asoc;
9760         chk->whoTo = NULL;
9761
9762         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9763         if (chk->data == NULL) {
9764                 sctp_free_a_chunk(stcb, chk);
9765                 return;
9766         }
9767         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9768         chk->sent = SCTP_DATAGRAM_UNSENT;
9769         chk->snd_count = 0;
9770         chk->whoTo = asoc->primary_destination;
9771         atomic_add_int(&chk->whoTo->ref_count, 1);
9772         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9773         asoc->ctrl_queue_cnt++;
9774 sctp_fill_in_rest:
9775         /*-
9776          * Here we go through and fill out the part that deals with
9777          * stream/seq of the ones we skip.
9778          */
9779         SCTP_BUF_LEN(chk->data) = 0;
9780         {
9781                 struct sctp_tmit_chunk *at, *tp1, *last;
9782                 struct sctp_strseq *strseq;
9783                 unsigned int cnt_of_space, i, ovh;
9784                 unsigned int space_needed;
9785                 unsigned int cnt_of_skipped = 0;
9786
9787                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9788                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9789                                 /* no more to look at */
9790                                 break;
9791                         }
9792                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9793                                 /* We don't report these */
9794                                 continue;
9795                         }
9796                         cnt_of_skipped++;
9797                 }
9798                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9799                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9800
9801                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9802
9803                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9804                         ovh = SCTP_MIN_OVERHEAD;
9805                 } else {
9806                         ovh = SCTP_MIN_V4_OVERHEAD;
9807                 }
9808                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9809                         /* trim to a mtu size */
9810                         cnt_of_space = asoc->smallest_mtu - ovh;
9811                 }
9812                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9813                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9814                             0xff, 0, cnt_of_skipped,
9815                             asoc->advanced_peer_ack_point);
9816
9817                 }
9818                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9819                 if (cnt_of_space < space_needed) {
9820                         /*-
9821                          * ok we must trim down the chunk by lowering the
9822                          * advance peer ack point.
9823                          */
9824                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9825                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9826                                     0xff, 0xff, cnt_of_space,
9827                                     space_needed);
9828                         }
9829                         cnt_of_skipped = (cnt_of_space -
9830                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9831                             sizeof(struct sctp_strseq)));
9832                         /*-
9833                          * Go through and find the TSN that will be the one
9834                          * we report.
9835                          */
9836                         at = TAILQ_FIRST(&asoc->sent_queue);
9837                         for (i = 0; i < cnt_of_skipped; i++) {
9838                                 tp1 = TAILQ_NEXT(at, sctp_next);
9839                                 at = tp1;
9840                         }
9841                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9842                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9843                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9844                                     asoc->advanced_peer_ack_point);
9845                         }
9846                         last = at;
9847                         /*-
9848                          * last now points to last one I can report, update
9849                          * peer ack point
9850                          */
9851                         advance_peer_ack_point = last->rec.data.TSN_seq;
9852                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9853                 }
9854                 chk->send_size = space_needed;
9855                 /* Setup the chunk */
9856                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9857                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9858                 fwdtsn->ch.chunk_flags = 0;
9859                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9860                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9861                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9862                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9863                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9864                 fwdtsn++;
9865                 /*-
9866                  * Move pointer to after the fwdtsn and transfer to the
9867                  * strseq pointer.
9868                  */
9869                 strseq = (struct sctp_strseq *)fwdtsn;
9870                 /*-
9871                  * Now populate the strseq list. This is done blindly
9872                  * without pulling out duplicate stream info. This is
9873                  * inefficent but won't harm the process since the peer will
9874                  * look at these in sequence and will thus release anything.
9875                  * It could mean we exceed the PMTU and chop off some that
9876                  * we could have included.. but this is unlikely (aka 1432/4
9877                  * would mean 300+ stream seq's would have to be reported in
9878                  * one FWD-TSN. With a bit of work we can later FIX this to
9879                  * optimize and pull out duplcates.. but it does add more
9880                  * overhead. So for now... not!
9881                  */
9882                 at = TAILQ_FIRST(&asoc->sent_queue);
9883                 for (i = 0; i < cnt_of_skipped; i++) {
9884                         tp1 = TAILQ_NEXT(at, sctp_next);
9885                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9886                                 /* We don't report these */
9887                                 i--;
9888                                 at = tp1;
9889                                 continue;
9890                         }
9891                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9892                                 at->rec.data.fwd_tsn_cnt = 0;
9893                         }
9894                         strseq->stream = ntohs(at->rec.data.stream_number);
9895                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9896                         strseq++;
9897                         at = tp1;
9898                 }
9899         }
9900         return;
9901
9902 }
9903
9904 void
9905 sctp_send_sack(struct sctp_tcb *stcb)
9906 {
9907         /*-
9908          * Queue up a SACK in the control queue. We must first check to see
9909          * if a SACK is somehow on the control queue. If so, we will take
9910          * and and remove the old one.
9911          */
9912         struct sctp_association *asoc;
9913         struct sctp_tmit_chunk *chk, *a_chk;
9914         struct sctp_sack_chunk *sack;
9915         struct sctp_gap_ack_block *gap_descriptor;
9916         struct sack_track *selector;
9917         int mergeable = 0;
9918         int offset;
9919         caddr_t limit;
9920         uint32_t *dup;
9921         int limit_reached = 0;
9922         unsigned int i, jstart, siz, j;
9923         unsigned int num_gap_blocks = 0, space;
9924         int num_dups = 0;
9925         int space_req;
9926
9927         a_chk = NULL;
9928         asoc = &stcb->asoc;
9929         SCTP_TCB_LOCK_ASSERT(stcb);
9930         if (asoc->last_data_chunk_from == NULL) {
9931                 /* Hmm we never received anything */
9932                 return;
9933         }
9934         sctp_set_rwnd(stcb, asoc);
9935         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9936                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9937                         /* Hmm, found a sack already on queue, remove it */
9938                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9939                         asoc->ctrl_queue_cnt++;
9940                         a_chk = chk;
9941                         if (a_chk->data) {
9942                                 sctp_m_freem(a_chk->data);
9943                                 a_chk->data = NULL;
9944                         }
9945                         sctp_free_remote_addr(a_chk->whoTo);
9946                         a_chk->whoTo = NULL;
9947                         break;
9948                 }
9949         }
9950         if (a_chk == NULL) {
9951                 sctp_alloc_a_chunk(stcb, a_chk);
9952                 if (a_chk == NULL) {
9953                         /* No memory so we drop the idea, and set a timer */
9954                         if (stcb->asoc.delayed_ack) {
9955                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9956                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9957                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9958                                     stcb->sctp_ep, stcb, NULL);
9959                         } else {
9960                                 stcb->asoc.send_sack = 1;
9961                         }
9962                         return;
9963                 }
9964                 a_chk->copy_by_ref = 0;
9965                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9966                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9967                 a_chk->rec.chunk_id.can_take_data = 1;
9968         }
9969         /* Clear our pkt counts */
9970         asoc->data_pkts_seen = 0;
9971
9972         a_chk->asoc = asoc;
9973         a_chk->snd_count = 0;
9974         a_chk->send_size = 0;   /* fill in later */
9975         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9976         a_chk->whoTo = NULL;
9977
9978         if ((asoc->numduptsns) ||
9979             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9980             ) {
9981                 /*-
9982                  * Ok, we have some duplicates or the destination for the
9983                  * sack is unreachable, lets see if we can select an
9984                  * alternate than asoc->last_data_chunk_from
9985                  */
9986                 if ((!(asoc->last_data_chunk_from->dest_state &
9987                     SCTP_ADDR_NOT_REACHABLE)) &&
9988                     (asoc->used_alt_onsack > asoc->numnets)) {
9989                         /* We used an alt last time, don't this time */
9990                         a_chk->whoTo = NULL;
9991                 } else {
9992                         asoc->used_alt_onsack++;
9993                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9994                 }
9995                 if (a_chk->whoTo == NULL) {
9996                         /* Nope, no alternate */
9997                         a_chk->whoTo = asoc->last_data_chunk_from;
9998                         asoc->used_alt_onsack = 0;
9999                 }
10000         } else {
10001                 /*
10002                  * No duplicates so we use the last place we received data
10003                  * from.
10004                  */
10005                 asoc->used_alt_onsack = 0;
10006                 a_chk->whoTo = asoc->last_data_chunk_from;
10007         }
10008         if (a_chk->whoTo) {
10009                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10010         }
10011         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10012                 /* no gaps */
10013                 space_req = sizeof(struct sctp_sack_chunk);
10014         } else {
10015                 /* gaps get a cluster */
10016                 space_req = MCLBYTES;
10017         }
10018         /* Ok now lets formulate a MBUF with our sack */
10019         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10020         if ((a_chk->data == NULL) ||
10021             (a_chk->whoTo == NULL)) {
10022                 /* rats, no mbuf memory */
10023                 if (a_chk->data) {
10024                         /* was a problem with the destination */
10025                         sctp_m_freem(a_chk->data);
10026                         a_chk->data = NULL;
10027                 }
10028                 sctp_free_a_chunk(stcb, a_chk);
10029                 /* sa_ignore NO_NULL_CHK */
10030                 if (stcb->asoc.delayed_ack) {
10031                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10032                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10033                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10034                             stcb->sctp_ep, stcb, NULL);
10035                 } else {
10036                         stcb->asoc.send_sack = 1;
10037                 }
10038                 return;
10039         }
10040         /* ok, lets go through and fill it in */
10041         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10042         space = M_TRAILINGSPACE(a_chk->data);
10043         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10044                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10045         }
10046         limit = mtod(a_chk->data, caddr_t);
10047         limit += space;
10048
10049         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10050         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
10051         /* 0x01 is used by nonce for ecn */
10052         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10053             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10054             (asoc->peer_supports_ecn_nonce))
10055                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10056         else
10057                 sack->ch.chunk_flags = 0;
10058
10059         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10060                 /*-
10061                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10062                  * received, then set high bit to 1, else 0. Reset
10063                  * pkts_rcvd.
10064                  */
10065                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10066                 asoc->cmt_dac_pkts_rcvd = 0;
10067         }
10068 #ifdef SCTP_ASOCLOG_OF_TSNS
10069         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10070         stcb->asoc.cumack_log_atsnt++;
10071         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10072                 stcb->asoc.cumack_log_atsnt = 0;
10073         }
10074 #endif
10075         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10076         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10077         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10078
10079         /* reset the readers interpretation */
10080         stcb->freed_by_sorcv_sincelast = 0;
10081
10082         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10083
10084         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10085                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10086         else
10087                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10088
10089         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10090                 offset = 1;
10091                 /*-
10092                  * cum-ack behind the mapping array, so we start and use all
10093                  * entries.
10094                  */
10095                 jstart = 0;
10096         } else {
10097                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10098                 /*-
10099                  * we skip the first one when the cum-ack is at or above the
10100                  * mapping array base. Note this only works if
10101                  */
10102                 jstart = 1;
10103         }
10104         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10105                 /* we have a gap .. maybe */
10106                 for (i = 0; i < siz; i++) {
10107                         selector = &sack_array[asoc->mapping_array[i]];
10108                         if (mergeable && selector->right_edge) {
10109                                 /*
10110                                  * Backup, left and right edges were ok to
10111                                  * merge.
10112                                  */
10113                                 num_gap_blocks--;
10114                                 gap_descriptor--;
10115                         }
10116                         if (selector->num_entries == 0)
10117                                 mergeable = 0;
10118                         else {
10119                                 for (j = jstart; j < selector->num_entries; j++) {
10120                                         if (mergeable && selector->right_edge) {
10121                                                 /*
10122                                                  * do a merge by NOT setting
10123                                                  * the left side
10124                                                  */
10125                                                 mergeable = 0;
10126                                         } else {
10127                                                 /*
10128                                                  * no merge, set the left
10129                                                  * side
10130                                                  */
10131                                                 mergeable = 0;
10132                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10133                                         }
10134                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10135                                         num_gap_blocks++;
10136                                         gap_descriptor++;
10137                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10138                                                 /* no more room */
10139                                                 limit_reached = 1;
10140                                                 break;
10141                                         }
10142                                 }
10143                                 if (selector->left_edge) {
10144                                         mergeable = 1;
10145                                 }
10146                         }
10147                         if (limit_reached) {
10148                                 /* Reached the limit stop */
10149                                 break;
10150                         }
10151                         jstart = 0;
10152                         offset += 8;
10153                 }
10154                 if (num_gap_blocks == 0) {
10155                         /*
10156                          * slide not yet happened, and somehow we got called
10157                          * to send a sack. Cumack needs to move up.
10158                          */
10159                         int abort_flag = 0;
10160
10161                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10162                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10163                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10164                 }
10165         }
10166         /* now we must add any dups we are going to report. */
10167         if ((limit_reached == 0) && (asoc->numduptsns)) {
10168                 dup = (uint32_t *) gap_descriptor;
10169                 for (i = 0; i < asoc->numduptsns; i++) {
10170                         *dup = htonl(asoc->dup_tsns[i]);
10171                         dup++;
10172                         num_dups++;
10173                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10174                                 /* no more room */
10175                                 break;
10176                         }
10177                 }
10178                 asoc->numduptsns = 0;
10179         }
10180         /*
10181          * now that the chunk is prepared queue it to the control chunk
10182          * queue.
10183          */
10184         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10185             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10186             (num_dups * sizeof(int32_t)));
10187         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10188         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10189         sack->sack.num_dup_tsns = htons(num_dups);
10190         sack->ch.chunk_length = htons(a_chk->send_size);
10191         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10192         asoc->ctrl_queue_cnt++;
10193         asoc->send_sack = 0;
10194         SCTP_STAT_INCR(sctps_sendsacks);
10195         return;
10196 }
10197
10198 /* EY - This method will replace sctp_send_sack method if nr_sacks negotiated*/
10199 void
10200 sctp_send_nr_sack(struct sctp_tcb *stcb)
10201 {
10202         /*-
10203          * Queue up an NR-SACK in the control queue. We must first check to see
10204          * if an NR-SACK is somehow on the control queue. If so, we will take
10205          * and and remove the old one.
10206          */
10207         struct sctp_association *asoc;
10208         struct sctp_tmit_chunk *chk, *a_chk;
10209
10210         struct sctp_nr_sack_chunk *nr_sack;
10211
10212         struct sctp_gap_ack_block *gap_descriptor;
10213         struct sctp_nr_gap_ack_block *nr_gap_descriptor;
10214
10215         struct sack_track *selector;
10216         struct sack_track *nr_selector;
10217
10218         /* EY do we need nr_mergeable, NO */
10219         int mergeable = 0;
10220         int offset;
10221         caddr_t limit;
10222         uint32_t *dup;
10223         int limit_reached = 0;
10224         unsigned int i, jstart, siz, j;
10225         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10226         int num_dups = 0;
10227         int space_req;
10228         unsigned int reserved = 0;
10229
10230         a_chk = NULL;
10231         asoc = &stcb->asoc;
10232         SCTP_TCB_LOCK_ASSERT(stcb);
10233         if (asoc->last_data_chunk_from == NULL) {
10234                 /* Hmm we never received anything */
10235                 return;
10236         }
10237         sctp_set_rwnd(stcb, asoc);
10238         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10239                 if (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) {
10240                         /* Hmm, found a sack already on queue, remove it */
10241                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10242                         asoc->ctrl_queue_cnt++;
10243                         a_chk = chk;
10244                         if (a_chk->data) {
10245                                 sctp_m_freem(a_chk->data);
10246                                 a_chk->data = NULL;
10247                         }
10248                         sctp_free_remote_addr(a_chk->whoTo);
10249                         a_chk->whoTo = NULL;
10250                         break;
10251                 }
10252         }
10253         if (a_chk == NULL) {
10254                 sctp_alloc_a_chunk(stcb, a_chk);
10255                 if (a_chk == NULL) {
10256                         /* No memory so we drop the idea, and set a timer */
10257                         if (stcb->asoc.delayed_ack) {
10258                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10259                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10260                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10261                                     stcb->sctp_ep, stcb, NULL);
10262                         } else {
10263                                 stcb->asoc.send_sack = 1;
10264                         }
10265                         return;
10266                 }
10267                 a_chk->copy_by_ref = 0;
10268                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
10269                 a_chk->rec.chunk_id.id = SCTP_NR_SELECTIVE_ACK;
10270                 a_chk->rec.chunk_id.can_take_data = 1;
10271         }
10272         /* Clear our pkt counts */
10273         asoc->data_pkts_seen = 0;
10274
10275         a_chk->asoc = asoc;
10276         a_chk->snd_count = 0;
10277         a_chk->send_size = 0;   /* fill in later */
10278         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10279         a_chk->whoTo = NULL;
10280
10281         if ((asoc->numduptsns) ||
10282             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
10283             ) {
10284                 /*-
10285                  * Ok, we have some duplicates or the destination for the
10286                  * sack is unreachable, lets see if we can select an
10287                  * alternate than asoc->last_data_chunk_from
10288                  */
10289                 if ((!(asoc->last_data_chunk_from->dest_state &
10290                     SCTP_ADDR_NOT_REACHABLE)) &&
10291                     (asoc->used_alt_onsack > asoc->numnets)) {
10292                         /* We used an alt last time, don't this time */
10293                         a_chk->whoTo = NULL;
10294                 } else {
10295                         asoc->used_alt_onsack++;
10296                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10297                 }
10298                 if (a_chk->whoTo == NULL) {
10299                         /* Nope, no alternate */
10300                         a_chk->whoTo = asoc->last_data_chunk_from;
10301                         asoc->used_alt_onsack = 0;
10302                 }
10303         } else {
10304                 /*
10305                  * No duplicates so we use the last place we received data
10306                  * from.
10307                  */
10308                 asoc->used_alt_onsack = 0;
10309                 a_chk->whoTo = asoc->last_data_chunk_from;
10310         }
10311         if (a_chk->whoTo) {
10312                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10313         }
10314         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10315                 /* no gaps */
10316                 space_req = sizeof(struct sctp_nr_sack_chunk);
10317         } else {
10318                 /* EY - what is this about? */
10319                 /* gaps get a cluster */
10320                 space_req = MCLBYTES;
10321         }
10322         /* Ok now lets formulate a MBUF with our sack */
10323         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10324         if ((a_chk->data == NULL) ||
10325             (a_chk->whoTo == NULL)) {
10326                 /* rats, no mbuf memory */
10327                 if (a_chk->data) {
10328                         /* was a problem with the destination */
10329                         sctp_m_freem(a_chk->data);
10330                         a_chk->data = NULL;
10331                 }
10332                 sctp_free_a_chunk(stcb, a_chk);
10333                 /* sa_ignore NO_NULL_CHK */
10334                 if (stcb->asoc.delayed_ack) {
10335                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10336                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10337                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10338                             stcb->sctp_ep, stcb, NULL);
10339                 } else {
10340                         stcb->asoc.send_sack = 1;
10341                 }
10342                 return;
10343         }
10344         /* ok, lets go through and fill it in */
10345         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10346         space = M_TRAILINGSPACE(a_chk->data);
10347         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10348                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10349         }
10350         limit = mtod(a_chk->data, caddr_t);
10351         limit += space;
10352
10353         nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10354         nr_sack->ch.chunk_type = SCTP_NR_SELECTIVE_ACK;
10355         /* EYJ */
10356         /* 0x01 is used by nonce for ecn */
10357         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10358             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10359             (asoc->peer_supports_ecn_nonce))
10360                 nr_sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10361         else
10362                 nr_sack->ch.chunk_flags = 0;
10363
10364         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10365                 /*-
10366                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10367                  * received, then set high bit to 1, else 0. Reset
10368                  * pkts_rcvd.
10369                  */
10370                 /* EY - TODO: which chunk flag is used in here? -The LSB */
10371                 nr_sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10372                 asoc->cmt_dac_pkts_rcvd = 0;
10373         }
10374 #ifdef SCTP_ASOCLOG_OF_TSNS
10375         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10376         stcb->asoc.cumack_log_atsnt++;
10377         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10378                 stcb->asoc.cumack_log_atsnt = 0;
10379         }
10380 #endif
10381         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10382         nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10383         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10384
10385         /* reset the readers interpretation */
10386         stcb->freed_by_sorcv_sincelast = 0;
10387
10388         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10389
10390         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10391                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10392         else
10393                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10394
10395         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10396                 offset = 1;
10397                 /*-
10398                  * cum-ack behind the mapping array, so we start and use all
10399                  * entries.
10400                  */
10401                 jstart = 0;
10402         } else {
10403                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10404                 /*-
10405                  * we skip the first one when the cum-ack is at or above the
10406                  * mapping array base. Note this only works if
10407                  */
10408                 jstart = 1;
10409         }
10410         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10411                 /* we have a gap .. maybe */
10412                 for (i = 0; i < siz; i++) {
10413                         selector = &sack_array[asoc->mapping_array[i]];
10414                         if (mergeable && selector->right_edge) {
10415                                 /*
10416                                  * Backup, left and right edges were ok to
10417                                  * merge.
10418                                  */
10419                                 num_gap_blocks--;
10420                                 gap_descriptor--;
10421                         }
10422                         if (selector->num_entries == 0)
10423                                 mergeable = 0;
10424                         else {
10425                                 for (j = jstart; j < selector->num_entries; j++) {
10426                                         if (mergeable && selector->right_edge) {
10427                                                 /*
10428                                                  * do a merge by NOT setting
10429                                                  * the left side
10430                                                  */
10431                                                 mergeable = 0;
10432                                         } else {
10433                                                 /*
10434                                                  * no merge, set the left
10435                                                  * side
10436                                                  */
10437                                                 mergeable = 0;
10438                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10439                                         }
10440                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10441                                         num_gap_blocks++;
10442                                         gap_descriptor++;
10443                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10444                                                 /* no more room */
10445                                                 limit_reached = 1;
10446                                                 break;
10447                                         }
10448                                 }
10449                                 if (selector->left_edge) {
10450                                         mergeable = 1;
10451                                 }
10452                         }
10453                         if (limit_reached) {
10454                                 /* Reached the limit stop */
10455                                 break;
10456                         }
10457                         jstart = 0;
10458                         offset += 8;
10459                 }
10460                 if (num_gap_blocks == 0) {
10461                         /*
10462                          * slide not yet happened, and somehow we got called
10463                          * to send a sack. Cumack needs to move up.
10464                          */
10465                         int abort_flag = 0;
10466
10467                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10468                         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10469                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10470                 }
10471         }
10472         /*---------------------------------------------------------filling the nr_gap_ack blocks----------------------------------------------------*/
10473
10474         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)gap_descriptor;
10475
10476         /* EY - there will be gaps + nr_gaps if draining is possible */
10477         if ((SCTP_BASE_SYSCTL(sctp_do_drain)) && (limit_reached == 0)) {
10478
10479                 mergeable = 0;
10480
10481                 if (asoc->highest_tsn_inside_nr_map > asoc->nr_mapping_array_base_tsn)
10482                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn) + 1) + 7) / 8;
10483                 else
10484                         siz = (((MAX_TSN - asoc->nr_mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10485
10486                 if (compare_with_wrap(asoc->nr_mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10487                         offset = 1;
10488                         /*-
10489                         * cum-ack behind the mapping array, so we start and use all
10490                         * entries.
10491                         */
10492                         jstart = 0;
10493                 } else {
10494                         offset = asoc->nr_mapping_array_base_tsn - asoc->cumulative_tsn;
10495                         /*-
10496                         * we skip the first one when the cum-ack is at or above the
10497                         * mapping array base. Note this only works if
10498                         */
10499                         jstart = 1;
10500                 }
10501                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10502                         /* we have a gap .. maybe */
10503                         for (i = 0; i < siz; i++) {
10504                                 nr_selector = &sack_array[asoc->nr_mapping_array[i]];
10505                                 if (mergeable && nr_selector->right_edge) {
10506                                         /*
10507                                          * Backup, left and right edges were
10508                                          * ok to merge.
10509                                          */
10510                                         num_nr_gap_blocks--;
10511                                         nr_gap_descriptor--;
10512                                 }
10513                                 if (nr_selector->num_entries == 0)
10514                                         mergeable = 0;
10515                                 else {
10516                                         for (j = jstart; j < nr_selector->num_entries; j++) {
10517                                                 if (mergeable && nr_selector->right_edge) {
10518                                                         /*
10519                                                          * do a merge by NOT
10520                                                          * setting the left
10521                                                          * side
10522                                                          */
10523                                                         mergeable = 0;
10524                                                 } else {
10525                                                         /*
10526                                                          * no merge, set the
10527                                                          * left side
10528                                                          */
10529                                                         mergeable = 0;
10530                                                         nr_gap_descriptor->start = htons((nr_selector->gaps[j].start + offset));
10531                                                 }
10532                                                 nr_gap_descriptor->end = htons((nr_selector->gaps[j].end + offset));
10533                                                 num_nr_gap_blocks++;
10534                                                 nr_gap_descriptor++;
10535                                                 if (((caddr_t)nr_gap_descriptor + sizeof(struct sctp_nr_gap_ack_block)) > limit) {
10536                                                         /* no more room */
10537                                                         limit_reached = 1;
10538                                                         break;
10539                                                 }
10540                                         }
10541                                         if (nr_selector->left_edge) {
10542                                                 mergeable = 1;
10543                                         }
10544                                 }
10545                                 if (limit_reached) {
10546                                         /* Reached the limit stop */
10547                                         break;
10548                                 }
10549                                 jstart = 0;
10550                                 offset += 8;
10551                         }
10552                 }
10553         }
10554         /*---------------------------------------------End of---filling the nr_gap_ack blocks----------------------------------------------------*/
10555
10556         /* now we must add any dups we are going to report. */
10557         if ((limit_reached == 0) && (asoc->numduptsns)) {
10558                 dup = (uint32_t *) nr_gap_descriptor;
10559                 for (i = 0; i < asoc->numduptsns; i++) {
10560                         *dup = htonl(asoc->dup_tsns[i]);
10561                         dup++;
10562                         num_dups++;
10563                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10564                                 /* no more room */
10565                                 break;
10566                         }
10567                 }
10568                 asoc->numduptsns = 0;
10569         }
10570         /*
10571          * now that the chunk is prepared queue it to the control chunk
10572          * queue.
10573          */
10574         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
10575                 num_nr_gap_blocks = num_gap_blocks;
10576                 num_gap_blocks = 0;
10577         }
10578         a_chk->send_size = (sizeof(struct sctp_nr_sack_chunk) +
10579             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10580             (num_nr_gap_blocks * sizeof(struct sctp_nr_gap_ack_block)) +
10581             (num_dups * sizeof(int32_t)));
10582
10583         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10584         nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10585         nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10586         nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10587         nr_sack->nr_sack.reserved = htons(reserved);
10588         nr_sack->ch.chunk_length = htons(a_chk->send_size);
10589         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10590         asoc->ctrl_queue_cnt++;
10591         asoc->send_sack = 0;
10592         SCTP_STAT_INCR(sctps_sendsacks);
10593         return;
10594 }
10595
10596 void
10597 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10598 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10599     SCTP_UNUSED
10600 #endif
10601 )
10602 {
10603         struct mbuf *m_abort;
10604         struct mbuf *m_out = NULL, *m_end = NULL;
10605         struct sctp_abort_chunk *abort = NULL;
10606         int sz;
10607         uint32_t auth_offset = 0;
10608         struct sctp_auth_chunk *auth = NULL;
10609
10610         /*-
10611          * Add an AUTH chunk, if chunk requires it and save the offset into
10612          * the chain for AUTH
10613          */
10614         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10615             stcb->asoc.peer_auth_chunks)) {
10616                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10617                     stcb, SCTP_ABORT_ASSOCIATION);
10618                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10619         }
10620         SCTP_TCB_LOCK_ASSERT(stcb);
10621         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10622         if (m_abort == NULL) {
10623                 /* no mbuf's */
10624                 if (m_out)
10625                         sctp_m_freem(m_out);
10626                 return;
10627         }
10628         /* link in any error */
10629         SCTP_BUF_NEXT(m_abort) = operr;
10630         sz = 0;
10631         if (operr) {
10632                 struct mbuf *n;
10633
10634                 n = operr;
10635                 while (n) {
10636                         sz += SCTP_BUF_LEN(n);
10637                         n = SCTP_BUF_NEXT(n);
10638                 }
10639         }
10640         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10641         if (m_out == NULL) {
10642                 /* NO Auth chunk prepended, so reserve space in front */
10643                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10644                 m_out = m_abort;
10645         } else {
10646                 /* Put AUTH chunk at the front of the chain */
10647                 SCTP_BUF_NEXT(m_end) = m_abort;
10648         }
10649
10650         /* fill in the ABORT chunk */
10651         abort = mtod(m_abort, struct sctp_abort_chunk *);
10652         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10653         abort->ch.chunk_flags = 0;
10654         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10655
10656         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10657             stcb->asoc.primary_destination,
10658             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10659             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10660             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10661             stcb->asoc.primary_destination->port, so_locked, NULL);
10662         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10663 }
10664
10665 void
10666 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10667     struct sctp_nets *net)
10668 {
10669         /* formulate and SEND a SHUTDOWN-COMPLETE */
10670         struct mbuf *m_shutdown_comp;
10671         struct sctp_shutdown_complete_chunk *shutdown_complete;
10672
10673         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10674         if (m_shutdown_comp == NULL) {
10675                 /* no mbuf's */
10676                 return;
10677         }
10678         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10679         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10680         shutdown_complete->ch.chunk_flags = 0;
10681         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10682         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10683         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10684             (struct sockaddr *)&net->ro._l_addr,
10685             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10686             stcb->sctp_ep->sctp_lport, stcb->rport,
10687             htonl(stcb->asoc.peer_vtag),
10688             net->port, SCTP_SO_NOT_LOCKED, NULL);
10689         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10690         return;
10691 }
10692
10693 void
10694 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10695     uint32_t vrf_id, uint16_t port)
10696 {
10697         /* formulate and SEND a SHUTDOWN-COMPLETE */
10698         struct mbuf *o_pak;
10699         struct mbuf *mout;
10700         struct ip *iph, *iph_out;
10701         struct udphdr *udp = NULL;
10702
10703 #ifdef INET6
10704         struct ip6_hdr *ip6, *ip6_out;
10705
10706 #endif
10707         int offset_out, len, mlen;
10708         struct sctp_shutdown_complete_msg *comp_cp;
10709
10710         iph = mtod(m, struct ip *);
10711         switch (iph->ip_v) {
10712         case IPVERSION:
10713                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10714                 break;
10715 #ifdef INET6
10716         case IPV6_VERSION >> 4:
10717                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10718                 break;
10719 #endif
10720         default:
10721                 return;
10722         }
10723         if (port) {
10724                 len += sizeof(struct udphdr);
10725         }
10726         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10727         if (mout == NULL) {
10728                 return;
10729         }
10730         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10731         SCTP_BUF_LEN(mout) = len;
10732         SCTP_BUF_NEXT(mout) = NULL;
10733         iph_out = NULL;
10734 #ifdef INET6
10735         ip6_out = NULL;
10736 #endif
10737         offset_out = 0;
10738
10739         switch (iph->ip_v) {
10740         case IPVERSION:
10741                 iph_out = mtod(mout, struct ip *);
10742
10743                 /* Fill in the IP header for the ABORT */
10744                 iph_out->ip_v = IPVERSION;
10745                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10746                 iph_out->ip_tos = (u_char)0;
10747                 iph_out->ip_id = 0;
10748                 iph_out->ip_off = 0;
10749                 iph_out->ip_ttl = MAXTTL;
10750                 if (port) {
10751                         iph_out->ip_p = IPPROTO_UDP;
10752                 } else {
10753                         iph_out->ip_p = IPPROTO_SCTP;
10754                 }
10755                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10756                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10757
10758                 /* let IP layer calculate this */
10759                 iph_out->ip_sum = 0;
10760                 offset_out += sizeof(*iph_out);
10761                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10762                     (caddr_t)iph_out + offset_out);
10763                 break;
10764 #ifdef INET6
10765         case IPV6_VERSION >> 4:
10766                 ip6 = (struct ip6_hdr *)iph;
10767                 ip6_out = mtod(mout, struct ip6_hdr *);
10768
10769                 /* Fill in the IPv6 header for the ABORT */
10770                 ip6_out->ip6_flow = ip6->ip6_flow;
10771                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
10772                 if (port) {
10773                         ip6_out->ip6_nxt = IPPROTO_UDP;
10774                 } else {
10775                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10776                 }
10777                 ip6_out->ip6_src = ip6->ip6_dst;
10778                 ip6_out->ip6_dst = ip6->ip6_src;
10779                 /*
10780                  * ?? The old code had both the iph len + payload, I think
10781                  * this is wrong and would never have worked
10782                  */
10783                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10784                 offset_out += sizeof(*ip6_out);
10785                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10786                     (caddr_t)ip6_out + offset_out);
10787                 break;
10788 #endif                          /* INET6 */
10789         default:
10790                 /* Currently not supported. */
10791                 sctp_m_freem(mout);
10792                 return;
10793         }
10794         if (port) {
10795                 udp = (struct udphdr *)comp_cp;
10796                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10797                 udp->uh_dport = port;
10798                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10799                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10800                 offset_out += sizeof(struct udphdr);
10801                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10802         }
10803         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10804                 /* no mbuf's */
10805                 sctp_m_freem(mout);
10806                 return;
10807         }
10808         /* Now copy in and fill in the ABORT tags etc. */
10809         comp_cp->sh.src_port = sh->dest_port;
10810         comp_cp->sh.dest_port = sh->src_port;
10811         comp_cp->sh.checksum = 0;
10812         comp_cp->sh.v_tag = sh->v_tag;
10813         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10814         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10815         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10816
10817         if (iph_out != NULL) {
10818                 sctp_route_t ro;
10819                 int ret;
10820                 struct sctp_tcb *stcb = NULL;
10821
10822                 mlen = SCTP_BUF_LEN(mout);
10823                 bzero(&ro, sizeof ro);
10824                 /* set IPv4 length */
10825                 iph_out->ip_len = mlen;
10826 #ifdef  SCTP_PACKET_LOGGING
10827                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10828                         sctp_packet_log(mout, mlen);
10829 #endif
10830                 if (port) {
10831                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10832                         SCTP_STAT_INCR(sctps_sendswcrc);
10833                         SCTP_ENABLE_UDP_CSUM(mout);
10834                 } else {
10835                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10836                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
10837                         SCTP_STAT_INCR(sctps_sendhwcrc);
10838                 }
10839                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10840                 /* out it goes */
10841                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10842
10843                 /* Free the route if we got one back */
10844                 if (ro.ro_rt)
10845                         RTFREE(ro.ro_rt);
10846         }
10847 #ifdef INET6
10848         if (ip6_out != NULL) {
10849                 struct route_in6 ro;
10850                 int ret;
10851                 struct sctp_tcb *stcb = NULL;
10852                 struct ifnet *ifp = NULL;
10853
10854                 bzero(&ro, sizeof(ro));
10855                 mlen = SCTP_BUF_LEN(mout);
10856 #ifdef  SCTP_PACKET_LOGGING
10857                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10858                         sctp_packet_log(mout, mlen);
10859 #endif
10860                 comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10861                 SCTP_STAT_INCR(sctps_sendswcrc);
10862                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10863                 if (port) {
10864                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10865                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10866                                 udp->uh_sum = 0xffff;
10867                         }
10868                 }
10869                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10870
10871                 /* Free the route if we got one back */
10872                 if (ro.ro_rt)
10873                         RTFREE(ro.ro_rt);
10874         }
10875 #endif
10876         SCTP_STAT_INCR(sctps_sendpackets);
10877         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10878         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10879         return;
10880
10881 }
10882
10883 static struct sctp_nets *
10884 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10885 {
10886         struct sctp_nets *net, *hnet;
10887         int ms_goneby, highest_ms, state_overide = 0;
10888
10889         (void)SCTP_GETTIME_TIMEVAL(now);
10890         highest_ms = 0;
10891         hnet = NULL;
10892         SCTP_TCB_LOCK_ASSERT(stcb);
10893         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10894                 if (
10895                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10896                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10897                     ) {
10898                         /*
10899                          * Skip this guy from consideration if HB is off AND
10900                          * its confirmed
10901                          */
10902                         continue;
10903                 }
10904                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10905                         /* skip this dest net from consideration */
10906                         continue;
10907                 }
10908                 if (net->last_sent_time.tv_sec) {
10909                         /* Sent to so we subtract */
10910                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10911                 } else
10912                         /* Never been sent to */
10913                         ms_goneby = 0x7fffffff;
10914                 /*-
10915                  * When the address state is unconfirmed but still
10916                  * considered reachable, we HB at a higher rate. Once it
10917                  * goes confirmed OR reaches the "unreachable" state, thenw
10918                  * we cut it back to HB at a more normal pace.
10919                  */
10920                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10921                         state_overide = 1;
10922                 } else {
10923                         state_overide = 0;
10924                 }
10925
10926                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10927                     (ms_goneby > highest_ms)) {
10928                         highest_ms = ms_goneby;
10929                         hnet = net;
10930                 }
10931         }
10932         if (hnet &&
10933             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10934                 state_overide = 1;
10935         } else {
10936                 state_overide = 0;
10937         }
10938
10939         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10940                 /*-
10941                  * Found the one with longest delay bounds OR it is
10942                  * unconfirmed and still not marked unreachable.
10943                  */
10944                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10945 #ifdef SCTP_DEBUG
10946                 if (hnet) {
10947                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10948                             (struct sockaddr *)&hnet->ro._l_addr);
10949                 } else {
10950                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10951                 }
10952 #endif
10953                 /* update the timer now */
10954                 hnet->last_sent_time = *now;
10955                 return (hnet);
10956         }
10957         /* Nothing to HB */
10958         return (NULL);
10959 }
10960
10961 int
10962 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10963 {
10964         struct sctp_tmit_chunk *chk;
10965         struct sctp_nets *net;
10966         struct sctp_heartbeat_chunk *hb;
10967         struct timeval now;
10968         struct sockaddr_in *sin;
10969         struct sockaddr_in6 *sin6;
10970
10971         SCTP_TCB_LOCK_ASSERT(stcb);
10972         if (user_req == 0) {
10973                 net = sctp_select_hb_destination(stcb, &now);
10974                 if (net == NULL) {
10975                         /*-
10976                          * All our busy none to send to, just start the
10977                          * timer again.
10978                          */
10979                         if (stcb->asoc.state == 0) {
10980                                 return (0);
10981                         }
10982                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10983                             stcb->sctp_ep,
10984                             stcb,
10985                             net);
10986                         return (0);
10987                 }
10988         } else {
10989                 net = u_net;
10990                 if (net == NULL) {
10991                         return (0);
10992                 }
10993                 (void)SCTP_GETTIME_TIMEVAL(&now);
10994         }
10995         sin = (struct sockaddr_in *)&net->ro._l_addr;
10996         if (sin->sin_family != AF_INET) {
10997                 if (sin->sin_family != AF_INET6) {
10998                         /* huh */
10999                         return (0);
11000                 }
11001         }
11002         sctp_alloc_a_chunk(stcb, chk);
11003         if (chk == NULL) {
11004                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11005                 return (0);
11006         }
11007         chk->copy_by_ref = 0;
11008         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11009         chk->rec.chunk_id.can_take_data = 1;
11010         chk->asoc = &stcb->asoc;
11011         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11012
11013         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11014         if (chk->data == NULL) {
11015                 sctp_free_a_chunk(stcb, chk);
11016                 return (0);
11017         }
11018         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11019         SCTP_BUF_LEN(chk->data) = chk->send_size;
11020         chk->sent = SCTP_DATAGRAM_UNSENT;
11021         chk->snd_count = 0;
11022         chk->whoTo = net;
11023         atomic_add_int(&chk->whoTo->ref_count, 1);
11024         /* Now we have a mbuf that we can fill in with the details */
11025         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11026         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11027         /* fill out chunk header */
11028         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11029         hb->ch.chunk_flags = 0;
11030         hb->ch.chunk_length = htons(chk->send_size);
11031         /* Fill out hb parameter */
11032         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11033         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11034         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11035         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11036         /* Did our user request this one, put it in */
11037         hb->heartbeat.hb_info.user_req = user_req;
11038         hb->heartbeat.hb_info.addr_family = sin->sin_family;
11039         hb->heartbeat.hb_info.addr_len = sin->sin_len;
11040         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11041                 /*
11042                  * we only take from the entropy pool if the address is not
11043                  * confirmed.
11044                  */
11045                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11046                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11047         } else {
11048                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11049                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11050         }
11051         if (sin->sin_family == AF_INET) {
11052                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
11053         } else if (sin->sin_family == AF_INET6) {
11054                 /* We leave the scope the way it is in our lookup table. */
11055                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
11056                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
11057         } else {
11058                 /* huh compiler bug */
11059                 return (0);
11060         }
11061
11062         /*
11063          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
11064          * PF-heartbeats.  Because of this, threshold management is done by
11065          * the t3 timer handler, and does not need to be done upon the send
11066          * of a PF-heartbeat. If CMT PF is on and the destination to which a
11067          * heartbeat is being sent is in PF state, do NOT do threshold
11068          * management.
11069          */
11070         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
11071                 /* ok we have a destination that needs a beat */
11072                 /* lets do the theshold management Qiaobing style */
11073                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
11074                     stcb->asoc.max_send_times)) {
11075                         /*-
11076                          * we have lost the association, in a way this is
11077                          * quite bad since we really are one less time since
11078                          * we really did not send yet. This is the down side
11079                          * to the Q's style as defined in the RFC and not my
11080                          * alternate style defined in the RFC.
11081                          */
11082                         if (chk->data != NULL) {
11083                                 sctp_m_freem(chk->data);
11084                                 chk->data = NULL;
11085                         }
11086                         /*
11087                          * Here we do NOT use the macro since the
11088                          * association is now gone.
11089                          */
11090                         if (chk->whoTo) {
11091                                 sctp_free_remote_addr(chk->whoTo);
11092                                 chk->whoTo = NULL;
11093                         }
11094                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
11095                         return (-1);
11096                 }
11097         }
11098         net->hb_responded = 0;
11099         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11100         stcb->asoc.ctrl_queue_cnt++;
11101         SCTP_STAT_INCR(sctps_sendheartbeat);
11102         /*-
11103          * Call directly med level routine to put out the chunk. It will
11104          * always tumble out control chunks aka HB but it may even tumble
11105          * out data too.
11106          */
11107         return (1);
11108 }
11109
11110 void
11111 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11112     uint32_t high_tsn)
11113 {
11114         struct sctp_association *asoc;
11115         struct sctp_ecne_chunk *ecne;
11116         struct sctp_tmit_chunk *chk;
11117
11118         asoc = &stcb->asoc;
11119         SCTP_TCB_LOCK_ASSERT(stcb);
11120         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11121                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
11122                         /* found a previous ECN_ECHO update it if needed */
11123                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11124                         ecne->tsn = htonl(high_tsn);
11125                         return;
11126                 }
11127         }
11128         /* nope could not find one to update so we must build one */
11129         sctp_alloc_a_chunk(stcb, chk);
11130         if (chk == NULL) {
11131                 return;
11132         }
11133         chk->copy_by_ref = 0;
11134         SCTP_STAT_INCR(sctps_sendecne);
11135         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11136         chk->rec.chunk_id.can_take_data = 0;
11137         chk->asoc = &stcb->asoc;
11138         chk->send_size = sizeof(struct sctp_ecne_chunk);
11139         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11140         if (chk->data == NULL) {
11141                 sctp_free_a_chunk(stcb, chk);
11142                 return;
11143         }
11144         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11145         SCTP_BUF_LEN(chk->data) = chk->send_size;
11146         chk->sent = SCTP_DATAGRAM_UNSENT;
11147         chk->snd_count = 0;
11148         chk->whoTo = net;
11149         atomic_add_int(&chk->whoTo->ref_count, 1);
11150         stcb->asoc.ecn_echo_cnt_onq++;
11151         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11152         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11153         ecne->ch.chunk_flags = 0;
11154         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11155         ecne->tsn = htonl(high_tsn);
11156         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11157         asoc->ctrl_queue_cnt++;
11158 }
11159
11160 void
11161 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11162     struct mbuf *m, int iphlen, int bad_crc)
11163 {
11164         struct sctp_association *asoc;
11165         struct sctp_pktdrop_chunk *drp;
11166         struct sctp_tmit_chunk *chk;
11167         uint8_t *datap;
11168         int len;
11169         int was_trunc = 0;
11170         struct ip *iph;
11171
11172 #ifdef INET6
11173         struct ip6_hdr *ip6h;
11174
11175 #endif
11176         int fullsz = 0, extra = 0;
11177         long spc;
11178         int offset;
11179         struct sctp_chunkhdr *ch, chunk_buf;
11180         unsigned int chk_length;
11181
11182         if (!stcb) {
11183                 return;
11184         }
11185         asoc = &stcb->asoc;
11186         SCTP_TCB_LOCK_ASSERT(stcb);
11187         if (asoc->peer_supports_pktdrop == 0) {
11188                 /*-
11189                  * peer must declare support before I send one.
11190                  */
11191                 return;
11192         }
11193         if (stcb->sctp_socket == NULL) {
11194                 return;
11195         }
11196         sctp_alloc_a_chunk(stcb, chk);
11197         if (chk == NULL) {
11198                 return;
11199         }
11200         chk->copy_by_ref = 0;
11201         iph = mtod(m, struct ip *);
11202         if (iph == NULL) {
11203                 sctp_free_a_chunk(stcb, chk);
11204                 return;
11205         }
11206         switch (iph->ip_v) {
11207         case IPVERSION:
11208                 /* IPv4 */
11209                 len = chk->send_size = iph->ip_len;
11210                 break;
11211 #ifdef INET6
11212         case IPV6_VERSION >> 4:
11213                 /* IPv6 */
11214                 ip6h = mtod(m, struct ip6_hdr *);
11215                 len = chk->send_size = htons(ip6h->ip6_plen);
11216                 break;
11217 #endif
11218         default:
11219                 return;
11220         }
11221         /* Validate that we do not have an ABORT in here. */
11222         offset = iphlen + sizeof(struct sctphdr);
11223         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11224             sizeof(*ch), (uint8_t *) & chunk_buf);
11225         while (ch != NULL) {
11226                 chk_length = ntohs(ch->chunk_length);
11227                 if (chk_length < sizeof(*ch)) {
11228                         /* break to abort land */
11229                         break;
11230                 }
11231                 switch (ch->chunk_type) {
11232                 case SCTP_PACKET_DROPPED:
11233                 case SCTP_ABORT_ASSOCIATION:
11234                         /*-
11235                          * we don't respond with an PKT-DROP to an ABORT
11236                          * or PKT-DROP
11237                          */
11238                         sctp_free_a_chunk(stcb, chk);
11239                         return;
11240                 default:
11241                         break;
11242                 }
11243                 offset += SCTP_SIZE32(chk_length);
11244                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11245                     sizeof(*ch), (uint8_t *) & chunk_buf);
11246         }
11247
11248         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11249             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11250                 /*
11251                  * only send 1 mtu worth, trim off the excess on the end.
11252                  */
11253                 fullsz = len - extra;
11254                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11255                 was_trunc = 1;
11256         }
11257         chk->asoc = &stcb->asoc;
11258         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11259         if (chk->data == NULL) {
11260 jump_out:
11261                 sctp_free_a_chunk(stcb, chk);
11262                 return;
11263         }
11264         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11265         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11266         if (drp == NULL) {
11267                 sctp_m_freem(chk->data);
11268                 chk->data = NULL;
11269                 goto jump_out;
11270         }
11271         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11272             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11273         chk->book_size_scale = 0;
11274         if (was_trunc) {
11275                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11276                 drp->trunc_len = htons(fullsz);
11277                 /*
11278                  * Len is already adjusted to size minus overhead above take
11279                  * out the pkt_drop chunk itself from it.
11280                  */
11281                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11282                 len = chk->send_size;
11283         } else {
11284                 /* no truncation needed */
11285                 drp->ch.chunk_flags = 0;
11286                 drp->trunc_len = htons(0);
11287         }
11288         if (bad_crc) {
11289                 drp->ch.chunk_flags |= SCTP_BADCRC;
11290         }
11291         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11292         SCTP_BUF_LEN(chk->data) = chk->send_size;
11293         chk->sent = SCTP_DATAGRAM_UNSENT;
11294         chk->snd_count = 0;
11295         if (net) {
11296                 /* we should hit here */
11297                 chk->whoTo = net;
11298         } else {
11299                 chk->whoTo = asoc->primary_destination;
11300         }
11301         atomic_add_int(&chk->whoTo->ref_count, 1);
11302         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11303         chk->rec.chunk_id.can_take_data = 1;
11304         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11305         drp->ch.chunk_length = htons(chk->send_size);
11306         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11307         if (spc < 0) {
11308                 spc = 0;
11309         }
11310         drp->bottle_bw = htonl(spc);
11311         if (asoc->my_rwnd) {
11312                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11313                     asoc->size_on_all_streams +
11314                     asoc->my_rwnd_control_len +
11315                     stcb->sctp_socket->so_rcv.sb_cc);
11316         } else {
11317                 /*-
11318                  * If my rwnd is 0, possibly from mbuf depletion as well as
11319                  * space used, tell the peer there is NO space aka onq == bw
11320                  */
11321                 drp->current_onq = htonl(spc);
11322         }
11323         drp->reserved = 0;
11324         datap = drp->data;
11325         m_copydata(m, iphlen, len, (caddr_t)datap);
11326         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11327         asoc->ctrl_queue_cnt++;
11328 }
11329
11330 void
11331 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11332 {
11333         struct sctp_association *asoc;
11334         struct sctp_cwr_chunk *cwr;
11335         struct sctp_tmit_chunk *chk;
11336
11337         asoc = &stcb->asoc;
11338         SCTP_TCB_LOCK_ASSERT(stcb);
11339         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11340                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11341                         /* found a previous ECN_CWR update it if needed */
11342                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11343                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11344                             MAX_TSN)) {
11345                                 cwr->tsn = htonl(high_tsn);
11346                         }
11347                         return;
11348                 }
11349         }
11350         /* nope could not find one to update so we must build one */
11351         sctp_alloc_a_chunk(stcb, chk);
11352         if (chk == NULL) {
11353                 return;
11354         }
11355         chk->copy_by_ref = 0;
11356         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11357         chk->rec.chunk_id.can_take_data = 1;
11358         chk->asoc = &stcb->asoc;
11359         chk->send_size = sizeof(struct sctp_cwr_chunk);
11360         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11361         if (chk->data == NULL) {
11362                 sctp_free_a_chunk(stcb, chk);
11363                 return;
11364         }
11365         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11366         SCTP_BUF_LEN(chk->data) = chk->send_size;
11367         chk->sent = SCTP_DATAGRAM_UNSENT;
11368         chk->snd_count = 0;
11369         chk->whoTo = net;
11370         atomic_add_int(&chk->whoTo->ref_count, 1);
11371         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11372         cwr->ch.chunk_type = SCTP_ECN_CWR;
11373         cwr->ch.chunk_flags = 0;
11374         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11375         cwr->tsn = htonl(high_tsn);
11376         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11377         asoc->ctrl_queue_cnt++;
11378 }
11379
11380 void
11381 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11382     int number_entries, uint16_t * list,
11383     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11384 {
11385         int len, old_len, i;
11386         struct sctp_stream_reset_out_request *req_out;
11387         struct sctp_chunkhdr *ch;
11388
11389         ch = mtod(chk->data, struct sctp_chunkhdr *);
11390
11391
11392         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11393
11394         /* get to new offset for the param. */
11395         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11396         /* now how long will this param be? */
11397         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11398         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11399         req_out->ph.param_length = htons(len);
11400         req_out->request_seq = htonl(seq);
11401         req_out->response_seq = htonl(resp_seq);
11402         req_out->send_reset_at_tsn = htonl(last_sent);
11403         if (number_entries) {
11404                 for (i = 0; i < number_entries; i++) {
11405                         req_out->list_of_streams[i] = htons(list[i]);
11406                 }
11407         }
11408         if (SCTP_SIZE32(len) > len) {
11409                 /*-
11410                  * Need to worry about the pad we may end up adding to the
11411                  * end. This is easy since the struct is either aligned to 4
11412                  * bytes or 2 bytes off.
11413                  */
11414                 req_out->list_of_streams[number_entries] = 0;
11415         }
11416         /* now fix the chunk length */
11417         ch->chunk_length = htons(len + old_len);
11418         chk->book_size = len + old_len;
11419         chk->book_size_scale = 0;
11420         chk->send_size = SCTP_SIZE32(chk->book_size);
11421         SCTP_BUF_LEN(chk->data) = chk->send_size;
11422         return;
11423 }
11424
11425
11426 void
11427 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11428     int number_entries, uint16_t * list,
11429     uint32_t seq)
11430 {
11431         int len, old_len, i;
11432         struct sctp_stream_reset_in_request *req_in;
11433         struct sctp_chunkhdr *ch;
11434
11435         ch = mtod(chk->data, struct sctp_chunkhdr *);
11436
11437
11438         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11439
11440         /* get to new offset for the param. */
11441         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11442         /* now how long will this param be? */
11443         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11444         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11445         req_in->ph.param_length = htons(len);
11446         req_in->request_seq = htonl(seq);
11447         if (number_entries) {
11448                 for (i = 0; i < number_entries; i++) {
11449                         req_in->list_of_streams[i] = htons(list[i]);
11450                 }
11451         }
11452         if (SCTP_SIZE32(len) > len) {
11453                 /*-
11454                  * Need to worry about the pad we may end up adding to the
11455                  * end. This is easy since the struct is either aligned to 4
11456                  * bytes or 2 bytes off.
11457                  */
11458                 req_in->list_of_streams[number_entries] = 0;
11459         }
11460         /* now fix the chunk length */
11461         ch->chunk_length = htons(len + old_len);
11462         chk->book_size = len + old_len;
11463         chk->book_size_scale = 0;
11464         chk->send_size = SCTP_SIZE32(chk->book_size);
11465         SCTP_BUF_LEN(chk->data) = chk->send_size;
11466         return;
11467 }
11468
11469
11470 void
11471 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11472     uint32_t seq)
11473 {
11474         int len, old_len;
11475         struct sctp_stream_reset_tsn_request *req_tsn;
11476         struct sctp_chunkhdr *ch;
11477
11478         ch = mtod(chk->data, struct sctp_chunkhdr *);
11479
11480
11481         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11482
11483         /* get to new offset for the param. */
11484         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11485         /* now how long will this param be? */
11486         len = sizeof(struct sctp_stream_reset_tsn_request);
11487         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11488         req_tsn->ph.param_length = htons(len);
11489         req_tsn->request_seq = htonl(seq);
11490
11491         /* now fix the chunk length */
11492         ch->chunk_length = htons(len + old_len);
11493         chk->send_size = len + old_len;
11494         chk->book_size = SCTP_SIZE32(chk->send_size);
11495         chk->book_size_scale = 0;
11496         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11497         return;
11498 }
11499
11500 void
11501 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11502     uint32_t resp_seq, uint32_t result)
11503 {
11504         int len, old_len;
11505         struct sctp_stream_reset_response *resp;
11506         struct sctp_chunkhdr *ch;
11507
11508         ch = mtod(chk->data, struct sctp_chunkhdr *);
11509
11510
11511         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11512
11513         /* get to new offset for the param. */
11514         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11515         /* now how long will this param be? */
11516         len = sizeof(struct sctp_stream_reset_response);
11517         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11518         resp->ph.param_length = htons(len);
11519         resp->response_seq = htonl(resp_seq);
11520         resp->result = ntohl(result);
11521
11522         /* now fix the chunk length */
11523         ch->chunk_length = htons(len + old_len);
11524         chk->book_size = len + old_len;
11525         chk->book_size_scale = 0;
11526         chk->send_size = SCTP_SIZE32(chk->book_size);
11527         SCTP_BUF_LEN(chk->data) = chk->send_size;
11528         return;
11529
11530 }
11531
11532
11533 void
11534 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11535     uint32_t resp_seq, uint32_t result,
11536     uint32_t send_una, uint32_t recv_next)
11537 {
11538         int len, old_len;
11539         struct sctp_stream_reset_response_tsn *resp;
11540         struct sctp_chunkhdr *ch;
11541
11542         ch = mtod(chk->data, struct sctp_chunkhdr *);
11543
11544
11545         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11546
11547         /* get to new offset for the param. */
11548         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11549         /* now how long will this param be? */
11550         len = sizeof(struct sctp_stream_reset_response_tsn);
11551         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11552         resp->ph.param_length = htons(len);
11553         resp->response_seq = htonl(resp_seq);
11554         resp->result = htonl(result);
11555         resp->senders_next_tsn = htonl(send_una);
11556         resp->receivers_next_tsn = htonl(recv_next);
11557
11558         /* now fix the chunk length */
11559         ch->chunk_length = htons(len + old_len);
11560         chk->book_size = len + old_len;
11561         chk->send_size = SCTP_SIZE32(chk->book_size);
11562         chk->book_size_scale = 0;
11563         SCTP_BUF_LEN(chk->data) = chk->send_size;
11564         return;
11565 }
11566
11567 static void
11568 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11569     uint32_t seq,
11570     uint16_t adding)
11571 {
11572         int len, old_len;
11573         struct sctp_chunkhdr *ch;
11574         struct sctp_stream_reset_add_strm *addstr;
11575
11576         ch = mtod(chk->data, struct sctp_chunkhdr *);
11577         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11578
11579         /* get to new offset for the param. */
11580         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11581         /* now how long will this param be? */
11582         len = sizeof(struct sctp_stream_reset_add_strm);
11583
11584         /* Fill it out. */
11585         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11586         addstr->ph.param_length = htons(len);
11587         addstr->request_seq = htonl(seq);
11588         addstr->number_of_streams = htons(adding);
11589         addstr->reserved = 0;
11590
11591         /* now fix the chunk length */
11592         ch->chunk_length = htons(len + old_len);
11593         chk->send_size = len + old_len;
11594         chk->book_size = SCTP_SIZE32(chk->send_size);
11595         chk->book_size_scale = 0;
11596         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11597         return;
11598 }
11599
11600 int
11601 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11602     int number_entries, uint16_t * list,
11603     uint8_t send_out_req,
11604     uint32_t resp_seq,
11605     uint8_t send_in_req,
11606     uint8_t send_tsn_req,
11607     uint8_t add_stream,
11608     uint16_t adding
11609 )
11610 {
11611
11612         struct sctp_association *asoc;
11613         struct sctp_tmit_chunk *chk;
11614         struct sctp_chunkhdr *ch;
11615         uint32_t seq;
11616
11617         asoc = &stcb->asoc;
11618         if (asoc->stream_reset_outstanding) {
11619                 /*-
11620                  * Already one pending, must get ACK back to clear the flag.
11621                  */
11622                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11623                 return (EBUSY);
11624         }
11625         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11626             (add_stream == 0)) {
11627                 /* nothing to do */
11628                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11629                 return (EINVAL);
11630         }
11631         if (send_tsn_req && (send_out_req || send_in_req)) {
11632                 /* error, can't do that */
11633                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11634                 return (EINVAL);
11635         }
11636         sctp_alloc_a_chunk(stcb, chk);
11637         if (chk == NULL) {
11638                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11639                 return (ENOMEM);
11640         }
11641         chk->copy_by_ref = 0;
11642         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11643         chk->rec.chunk_id.can_take_data = 0;
11644         chk->asoc = &stcb->asoc;
11645         chk->book_size = sizeof(struct sctp_chunkhdr);
11646         chk->send_size = SCTP_SIZE32(chk->book_size);
11647         chk->book_size_scale = 0;
11648
11649         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11650         if (chk->data == NULL) {
11651                 sctp_free_a_chunk(stcb, chk);
11652                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11653                 return (ENOMEM);
11654         }
11655         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11656
11657         /* setup chunk parameters */
11658         chk->sent = SCTP_DATAGRAM_UNSENT;
11659         chk->snd_count = 0;
11660         chk->whoTo = asoc->primary_destination;
11661         atomic_add_int(&chk->whoTo->ref_count, 1);
11662
11663         ch = mtod(chk->data, struct sctp_chunkhdr *);
11664         ch->chunk_type = SCTP_STREAM_RESET;
11665         ch->chunk_flags = 0;
11666         ch->chunk_length = htons(chk->book_size);
11667         SCTP_BUF_LEN(chk->data) = chk->send_size;
11668
11669         seq = stcb->asoc.str_reset_seq_out;
11670         if (send_out_req) {
11671                 sctp_add_stream_reset_out(chk, number_entries, list,
11672                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11673                 asoc->stream_reset_out_is_outstanding = 1;
11674                 seq++;
11675                 asoc->stream_reset_outstanding++;
11676         }
11677         if (add_stream) {
11678                 sctp_add_a_stream(chk, seq, adding);
11679                 seq++;
11680                 asoc->stream_reset_outstanding++;
11681         }
11682         if (send_in_req) {
11683                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11684                 asoc->stream_reset_outstanding++;
11685         }
11686         if (send_tsn_req) {
11687                 sctp_add_stream_reset_tsn(chk, seq);
11688                 asoc->stream_reset_outstanding++;
11689         }
11690         asoc->str_reset = chk;
11691
11692         /* insert the chunk for sending */
11693         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11694             chk,
11695             sctp_next);
11696         asoc->ctrl_queue_cnt++;
11697         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11698         return (0);
11699 }
11700
11701 void
11702 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11703     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11704 {
11705         /*-
11706          * Formulate the abort message, and send it back down.
11707          */
11708         struct mbuf *o_pak;
11709         struct mbuf *mout;
11710         struct sctp_abort_msg *abm;
11711         struct ip *iph, *iph_out;
11712         struct udphdr *udp;
11713
11714 #ifdef INET6
11715         struct ip6_hdr *ip6, *ip6_out;
11716
11717 #endif
11718         int iphlen_out, len;
11719
11720         /* don't respond to ABORT with ABORT */
11721         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11722                 if (err_cause)
11723                         sctp_m_freem(err_cause);
11724                 return;
11725         }
11726         iph = mtod(m, struct ip *);
11727         switch (iph->ip_v) {
11728         case IPVERSION:
11729                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11730                 break;
11731 #ifdef INET6
11732         case IPV6_VERSION >> 4:
11733                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11734                 break;
11735 #endif
11736         default:
11737                 if (err_cause) {
11738                         sctp_m_freem(err_cause);
11739                 }
11740                 return;
11741         }
11742         if (port) {
11743                 len += sizeof(struct udphdr);
11744         }
11745         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11746         if (mout == NULL) {
11747                 if (err_cause) {
11748                         sctp_m_freem(err_cause);
11749                 }
11750                 return;
11751         }
11752         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11753         SCTP_BUF_LEN(mout) = len;
11754         SCTP_BUF_NEXT(mout) = err_cause;
11755         iph_out = NULL;
11756 #ifdef INET6
11757         ip6_out = NULL;
11758 #endif
11759         switch (iph->ip_v) {
11760         case IPVERSION:
11761                 iph_out = mtod(mout, struct ip *);
11762
11763                 /* Fill in the IP header for the ABORT */
11764                 iph_out->ip_v = IPVERSION;
11765                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11766                 iph_out->ip_tos = (u_char)0;
11767                 iph_out->ip_id = 0;
11768                 iph_out->ip_off = 0;
11769                 iph_out->ip_ttl = MAXTTL;
11770                 if (port) {
11771                         iph_out->ip_p = IPPROTO_UDP;
11772                 } else {
11773                         iph_out->ip_p = IPPROTO_SCTP;
11774                 }
11775                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11776                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11777                 /* let IP layer calculate this */
11778                 iph_out->ip_sum = 0;
11779
11780                 iphlen_out = sizeof(*iph_out);
11781                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11782                 break;
11783 #ifdef INET6
11784         case IPV6_VERSION >> 4:
11785                 ip6 = (struct ip6_hdr *)iph;
11786                 ip6_out = mtod(mout, struct ip6_hdr *);
11787
11788                 /* Fill in the IP6 header for the ABORT */
11789                 ip6_out->ip6_flow = ip6->ip6_flow;
11790                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11791                 if (port) {
11792                         ip6_out->ip6_nxt = IPPROTO_UDP;
11793                 } else {
11794                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11795                 }
11796                 ip6_out->ip6_src = ip6->ip6_dst;
11797                 ip6_out->ip6_dst = ip6->ip6_src;
11798
11799                 iphlen_out = sizeof(*ip6_out);
11800                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11801                 break;
11802 #endif                          /* INET6 */
11803         default:
11804                 /* Currently not supported */
11805                 sctp_m_freem(mout);
11806                 return;
11807         }
11808
11809         udp = (struct udphdr *)abm;
11810         if (port) {
11811                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11812                 udp->uh_dport = port;
11813                 /* set udp->uh_ulen later */
11814                 udp->uh_sum = 0;
11815                 iphlen_out += sizeof(struct udphdr);
11816                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11817         }
11818         abm->sh.src_port = sh->dest_port;
11819         abm->sh.dest_port = sh->src_port;
11820         abm->sh.checksum = 0;
11821         if (vtag == 0) {
11822                 abm->sh.v_tag = sh->v_tag;
11823                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11824         } else {
11825                 abm->sh.v_tag = htonl(vtag);
11826                 abm->msg.ch.chunk_flags = 0;
11827         }
11828         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11829
11830         if (err_cause) {
11831                 struct mbuf *m_tmp = err_cause;
11832                 int err_len = 0;
11833
11834                 /* get length of the err_cause chain */
11835                 while (m_tmp != NULL) {
11836                         err_len += SCTP_BUF_LEN(m_tmp);
11837                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11838                 }
11839                 len = SCTP_BUF_LEN(mout) + err_len;
11840                 if (err_len % 4) {
11841                         /* need pad at end of chunk */
11842                         uint32_t cpthis = 0;
11843                         int padlen;
11844
11845                         padlen = 4 - (len % 4);
11846                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11847                         len += padlen;
11848                 }
11849                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11850         } else {
11851                 len = SCTP_BUF_LEN(mout);
11852                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11853         }
11854
11855         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11856                 /* no mbuf's */
11857                 sctp_m_freem(mout);
11858                 return;
11859         }
11860         if (iph_out != NULL) {
11861                 sctp_route_t ro;
11862                 struct sctp_tcb *stcb = NULL;
11863                 int ret;
11864
11865                 /* zap the stack pointer to the route */
11866                 bzero(&ro, sizeof ro);
11867                 if (port) {
11868                         udp->uh_ulen = htons(len - sizeof(struct ip));
11869                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11870                 }
11871                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11872                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11873                 /* set IPv4 length */
11874                 iph_out->ip_len = len;
11875                 /* out it goes */
11876 #ifdef  SCTP_PACKET_LOGGING
11877                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11878                         sctp_packet_log(mout, len);
11879 #endif
11880                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11881                 if (port) {
11882                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11883                         SCTP_STAT_INCR(sctps_sendswcrc);
11884                         SCTP_ENABLE_UDP_CSUM(o_pak);
11885                 } else {
11886                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11887                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
11888                         SCTP_STAT_INCR(sctps_sendhwcrc);
11889                 }
11890                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11891
11892                 /* Free the route if we got one back */
11893                 if (ro.ro_rt)
11894                         RTFREE(ro.ro_rt);
11895         }
11896 #ifdef INET6
11897         if (ip6_out != NULL) {
11898                 struct route_in6 ro;
11899                 int ret;
11900                 struct sctp_tcb *stcb = NULL;
11901                 struct ifnet *ifp = NULL;
11902
11903                 /* zap the stack pointer to the route */
11904                 bzero(&ro, sizeof(ro));
11905                 if (port) {
11906                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11907                 }
11908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11909                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11910                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11911 #ifdef  SCTP_PACKET_LOGGING
11912                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11913                         sctp_packet_log(mout, len);
11914 #endif
11915                 abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11916                 SCTP_STAT_INCR(sctps_sendswcrc);
11917                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11918                 if (port) {
11919                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11920                                 udp->uh_sum = 0xffff;
11921                         }
11922                 }
11923                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11924
11925                 /* Free the route if we got one back */
11926                 if (ro.ro_rt)
11927                         RTFREE(ro.ro_rt);
11928         }
11929 #endif
11930         SCTP_STAT_INCR(sctps_sendpackets);
11931         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11932         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11933 }
11934
11935 void
11936 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11937     uint32_t vrf_id, uint16_t port)
11938 {
11939         struct mbuf *o_pak;
11940         struct sctphdr *sh, *sh_out;
11941         struct sctp_chunkhdr *ch;
11942         struct ip *iph, *iph_out;
11943         struct udphdr *udp = NULL;
11944         struct mbuf *mout;
11945
11946 #ifdef INET6
11947         struct ip6_hdr *ip6, *ip6_out;
11948
11949 #endif
11950         int iphlen_out, len;
11951
11952         iph = mtod(m, struct ip *);
11953         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11954         switch (iph->ip_v) {
11955         case IPVERSION:
11956                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11957                 break;
11958 #ifdef INET6
11959         case IPV6_VERSION >> 4:
11960                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11961                 break;
11962 #endif
11963         default:
11964                 if (scm) {
11965                         sctp_m_freem(scm);
11966                 }
11967                 return;
11968         }
11969         if (port) {
11970                 len += sizeof(struct udphdr);
11971         }
11972         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11973         if (mout == NULL) {
11974                 if (scm) {
11975                         sctp_m_freem(scm);
11976                 }
11977                 return;
11978         }
11979         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11980         SCTP_BUF_LEN(mout) = len;
11981         SCTP_BUF_NEXT(mout) = scm;
11982         iph_out = NULL;
11983 #ifdef INET6
11984         ip6_out = NULL;
11985 #endif
11986         switch (iph->ip_v) {
11987         case IPVERSION:
11988                 iph_out = mtod(mout, struct ip *);
11989
11990                 /* Fill in the IP header for the ABORT */
11991                 iph_out->ip_v = IPVERSION;
11992                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11993                 iph_out->ip_tos = (u_char)0;
11994                 iph_out->ip_id = 0;
11995                 iph_out->ip_off = 0;
11996                 iph_out->ip_ttl = MAXTTL;
11997                 if (port) {
11998                         iph_out->ip_p = IPPROTO_UDP;
11999                 } else {
12000                         iph_out->ip_p = IPPROTO_SCTP;
12001                 }
12002                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12003                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12004                 /* let IP layer calculate this */
12005                 iph_out->ip_sum = 0;
12006
12007                 iphlen_out = sizeof(struct ip);
12008                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12009                 break;
12010 #ifdef INET6
12011         case IPV6_VERSION >> 4:
12012                 ip6 = (struct ip6_hdr *)iph;
12013                 ip6_out = mtod(mout, struct ip6_hdr *);
12014
12015                 /* Fill in the IP6 header for the ABORT */
12016                 ip6_out->ip6_flow = ip6->ip6_flow;
12017                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
12018                 if (port) {
12019                         ip6_out->ip6_nxt = IPPROTO_UDP;
12020                 } else {
12021                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12022                 }
12023                 ip6_out->ip6_src = ip6->ip6_dst;
12024                 ip6_out->ip6_dst = ip6->ip6_src;
12025
12026                 iphlen_out = sizeof(struct ip6_hdr);
12027                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12028                 break;
12029 #endif                          /* INET6 */
12030         default:
12031                 /* Currently not supported */
12032                 sctp_m_freem(mout);
12033                 return;
12034         }
12035
12036         udp = (struct udphdr *)sh_out;
12037         if (port) {
12038                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12039                 udp->uh_dport = port;
12040                 /* set udp->uh_ulen later */
12041                 udp->uh_sum = 0;
12042                 iphlen_out += sizeof(struct udphdr);
12043                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12044         }
12045         sh_out->src_port = sh->dest_port;
12046         sh_out->dest_port = sh->src_port;
12047         sh_out->v_tag = vtag;
12048         sh_out->checksum = 0;
12049
12050         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12051         ch->chunk_type = SCTP_OPERATION_ERROR;
12052         ch->chunk_flags = 0;
12053
12054         if (scm) {
12055                 struct mbuf *m_tmp = scm;
12056                 int cause_len = 0;
12057
12058                 /* get length of the err_cause chain */
12059                 while (m_tmp != NULL) {
12060                         cause_len += SCTP_BUF_LEN(m_tmp);
12061                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12062                 }
12063                 len = SCTP_BUF_LEN(mout) + cause_len;
12064                 if (cause_len % 4) {
12065                         /* need pad at end of chunk */
12066                         uint32_t cpthis = 0;
12067                         int padlen;
12068
12069                         padlen = 4 - (len % 4);
12070                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12071                         len += padlen;
12072                 }
12073                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12074         } else {
12075                 len = SCTP_BUF_LEN(mout);
12076                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12077         }
12078
12079         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12080                 /* no mbuf's */
12081                 sctp_m_freem(mout);
12082                 return;
12083         }
12084         if (iph_out != NULL) {
12085                 sctp_route_t ro;
12086                 struct sctp_tcb *stcb = NULL;
12087                 int ret;
12088
12089                 /* zap the stack pointer to the route */
12090                 bzero(&ro, sizeof ro);
12091                 if (port) {
12092                         udp->uh_ulen = htons(len - sizeof(struct ip));
12093                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12094                 }
12095                 /* set IPv4 length */
12096                 iph_out->ip_len = len;
12097                 /* out it goes */
12098 #ifdef  SCTP_PACKET_LOGGING
12099                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12100                         sctp_packet_log(mout, len);
12101 #endif
12102                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12103                 if (port) {
12104                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12105                         SCTP_STAT_INCR(sctps_sendswcrc);
12106                         SCTP_ENABLE_UDP_CSUM(o_pak);
12107                 } else {
12108                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12109                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
12110                         SCTP_STAT_INCR(sctps_sendhwcrc);
12111                 }
12112                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
12113
12114                 /* Free the route if we got one back */
12115                 if (ro.ro_rt)
12116                         RTFREE(ro.ro_rt);
12117         }
12118 #ifdef INET6
12119         if (ip6_out != NULL) {
12120                 struct route_in6 ro;
12121                 int ret;
12122                 struct sctp_tcb *stcb = NULL;
12123                 struct ifnet *ifp = NULL;
12124
12125                 /* zap the stack pointer to the route */
12126                 bzero(&ro, sizeof(ro));
12127                 if (port) {
12128                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12129                 }
12130                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12131 #ifdef  SCTP_PACKET_LOGGING
12132                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12133                         sctp_packet_log(mout, len);
12134 #endif
12135                 sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12136                 SCTP_STAT_INCR(sctps_sendswcrc);
12137                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12138                 if (port) {
12139                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12140                                 udp->uh_sum = 0xffff;
12141                         }
12142                 }
12143                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
12144
12145                 /* Free the route if we got one back */
12146                 if (ro.ro_rt)
12147                         RTFREE(ro.ro_rt);
12148         }
12149 #endif
12150         SCTP_STAT_INCR(sctps_sendpackets);
12151         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12152         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12153 }
12154
12155 static struct mbuf *
12156 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12157     struct uio *uio,
12158     struct sctp_sndrcvinfo *srcv,
12159     int max_send_len,
12160     int user_marks_eor,
12161     int *error,
12162     uint32_t * sndout,
12163     struct mbuf **new_tail)
12164 {
12165         struct mbuf *m;
12166
12167         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12168             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12169         if (m == NULL) {
12170                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12171                 *error = ENOMEM;
12172         } else {
12173                 *sndout = m_length(m, NULL);
12174                 *new_tail = m_last(m);
12175         }
12176         return (m);
12177 }
12178
12179 static int
12180 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12181     struct uio *uio,
12182     int resv_upfront)
12183 {
12184         int left;
12185
12186         left = sp->length;
12187         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12188             resv_upfront, 0);
12189         if (sp->data == NULL) {
12190                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12191                 return (ENOMEM);
12192         }
12193         sp->tail_mbuf = m_last(sp->data);
12194         return (0);
12195 }
12196
12197
12198
12199 static struct sctp_stream_queue_pending *
12200 sctp_copy_it_in(struct sctp_tcb *stcb,
12201     struct sctp_association *asoc,
12202     struct sctp_sndrcvinfo *srcv,
12203     struct uio *uio,
12204     struct sctp_nets *net,
12205     int max_send_len,
12206     int user_marks_eor,
12207     int *error,
12208     int non_blocking)
12209 {
12210         /*-
12211          * This routine must be very careful in its work. Protocol
12212          * processing is up and running so care must be taken to spl...()
12213          * when you need to do something that may effect the stcb/asoc. The
12214          * sb is locked however. When data is copied the protocol processing
12215          * should be enabled since this is a slower operation...
12216          */
12217         struct sctp_stream_queue_pending *sp = NULL;
12218         int resv_in_first;
12219
12220         *error = 0;
12221         /* Now can we send this? */
12222         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12223             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12224             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12225             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12226                 /* got data while shutting down */
12227                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12228                 *error = ECONNRESET;
12229                 goto out_now;
12230         }
12231         sctp_alloc_a_strmoq(stcb, sp);
12232         if (sp == NULL) {
12233                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12234                 *error = ENOMEM;
12235                 goto out_now;
12236         }
12237         sp->act_flags = 0;
12238         sp->sender_all_done = 0;
12239         sp->sinfo_flags = srcv->sinfo_flags;
12240         sp->timetolive = srcv->sinfo_timetolive;
12241         sp->ppid = srcv->sinfo_ppid;
12242         sp->context = srcv->sinfo_context;
12243         sp->strseq = 0;
12244         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12245
12246         sp->stream = srcv->sinfo_stream;
12247         sp->length = min(uio->uio_resid, max_send_len);
12248         if ((sp->length == (uint32_t) uio->uio_resid) &&
12249             ((user_marks_eor == 0) ||
12250             (srcv->sinfo_flags & SCTP_EOF) ||
12251             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12252                 sp->msg_is_complete = 1;
12253         } else {
12254                 sp->msg_is_complete = 0;
12255         }
12256         sp->sender_all_done = 0;
12257         sp->some_taken = 0;
12258         sp->put_last_out = 0;
12259         resv_in_first = sizeof(struct sctp_data_chunk);
12260         sp->data = sp->tail_mbuf = NULL;
12261         if (sp->length == 0) {
12262                 *error = 0;
12263                 goto skip_copy;
12264         }
12265         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12266         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12267                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12268                 sp->holds_key_ref = 1;
12269         }
12270         *error = sctp_copy_one(sp, uio, resv_in_first);
12271 skip_copy:
12272         if (*error) {
12273                 sctp_free_a_strmoq(stcb, sp);
12274                 sp = NULL;
12275         } else {
12276                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12277                         sp->net = net;
12278                         sp->addr_over = 1;
12279                 } else {
12280                         sp->net = asoc->primary_destination;
12281                         sp->addr_over = 0;
12282                 }
12283                 atomic_add_int(&sp->net->ref_count, 1);
12284                 sctp_set_prsctp_policy(sp);
12285         }
12286 out_now:
12287         return (sp);
12288 }
12289
12290
12291 int
12292 sctp_sosend(struct socket *so,
12293     struct sockaddr *addr,
12294     struct uio *uio,
12295     struct mbuf *top,
12296     struct mbuf *control,
12297     int flags,
12298     struct thread *p
12299 )
12300 {
12301         struct sctp_inpcb *inp;
12302         int error, use_rcvinfo = 0;
12303         struct sctp_sndrcvinfo srcv;
12304         struct sockaddr *addr_to_use;
12305
12306 #ifdef INET6
12307         struct sockaddr_in sin;
12308
12309 #endif
12310
12311         inp = (struct sctp_inpcb *)so->so_pcb;
12312         if (control) {
12313                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12314                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12315                     sizeof(srcv))) {
12316                         /* got one */
12317                         use_rcvinfo = 1;
12318                 }
12319         }
12320         addr_to_use = addr;
12321 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
12322         if ((addr) && (addr->sa_family == AF_INET6)) {
12323                 struct sockaddr_in6 *sin6;
12324
12325                 sin6 = (struct sockaddr_in6 *)addr;
12326                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12327                         in6_sin6_2_sin(&sin, sin6);
12328                         addr_to_use = (struct sockaddr *)&sin;
12329                 }
12330         }
12331 #endif
12332         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12333             control,
12334             flags,
12335             use_rcvinfo, &srcv
12336             ,p
12337             );
12338         return (error);
12339 }
12340
12341
12342 int
12343 sctp_lower_sosend(struct socket *so,
12344     struct sockaddr *addr,
12345     struct uio *uio,
12346     struct mbuf *i_pak,
12347     struct mbuf *control,
12348     int flags,
12349     int use_rcvinfo,
12350     struct sctp_sndrcvinfo *srcv
12351     ,
12352     struct thread *p
12353 )
12354 {
12355         unsigned int sndlen = 0, max_len;
12356         int error, len;
12357         struct mbuf *top = NULL;
12358         int queue_only = 0, queue_only_for_init = 0;
12359         int free_cnt_applied = 0;
12360         int un_sent = 0;
12361         int now_filled = 0;
12362         unsigned int inqueue_bytes = 0;
12363         struct sctp_block_entry be;
12364         struct sctp_inpcb *inp;
12365         struct sctp_tcb *stcb = NULL;
12366         struct timeval now;
12367         struct sctp_nets *net;
12368         struct sctp_association *asoc;
12369         struct sctp_inpcb *t_inp;
12370         int user_marks_eor;
12371         int create_lock_applied = 0;
12372         int nagle_applies = 0;
12373         int some_on_control = 0;
12374         int got_all_of_the_send = 0;
12375         int hold_tcblock = 0;
12376         int non_blocking = 0;
12377         int temp_flags = 0;
12378         uint32_t local_add_more, local_soresv = 0;
12379
12380         error = 0;
12381         net = NULL;
12382         stcb = NULL;
12383         asoc = NULL;
12384
12385         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12386         if (inp == NULL) {
12387                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12388                 error = EINVAL;
12389                 if (i_pak) {
12390                         SCTP_RELEASE_PKT(i_pak);
12391                 }
12392                 return (error);
12393         }
12394         if ((uio == NULL) && (i_pak == NULL)) {
12395                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12396                 return (EINVAL);
12397         }
12398         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12399         atomic_add_int(&inp->total_sends, 1);
12400         if (uio) {
12401                 if (uio->uio_resid < 0) {
12402                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12403                         return (EINVAL);
12404                 }
12405                 sndlen = uio->uio_resid;
12406         } else {
12407                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12408                 sndlen = SCTP_HEADER_LEN(i_pak);
12409         }
12410         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12411             addr,
12412             sndlen);
12413         /*-
12414          * Pre-screen address, if one is given the sin-len
12415          * must be set correctly!
12416          */
12417         if (addr) {
12418                 if ((addr->sa_family == AF_INET) &&
12419                     (addr->sa_len != sizeof(struct sockaddr_in))) {
12420                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12421                         error = EINVAL;
12422                         goto out_unlocked;
12423                 } else if ((addr->sa_family == AF_INET6) &&
12424                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
12425                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12426                         error = EINVAL;
12427                         goto out_unlocked;
12428                 }
12429         }
12430         hold_tcblock = 0;
12431
12432         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12433             (inp->sctp_socket->so_qlimit)) {
12434                 /* The listener can NOT send */
12435                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12436                 error = ENOTCONN;
12437                 goto out_unlocked;
12438         }
12439         if ((use_rcvinfo) && srcv) {
12440                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
12441                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
12442                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12443                         error = EINVAL;
12444                         goto out_unlocked;
12445                 }
12446                 if (srcv->sinfo_flags)
12447                         SCTP_STAT_INCR(sctps_sends_with_flags);
12448
12449                 if (srcv->sinfo_flags & SCTP_SENDALL) {
12450                         /* its a sendall */
12451                         error = sctp_sendall(inp, uio, top, srcv);
12452                         top = NULL;
12453                         goto out_unlocked;
12454                 }
12455         }
12456         /* now we must find the assoc */
12457         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12458             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12459                 SCTP_INP_RLOCK(inp);
12460                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12461                 if (stcb == NULL) {
12462                         SCTP_INP_RUNLOCK(inp);
12463                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12464                         error = ENOTCONN;
12465                         goto out_unlocked;
12466                 }
12467                 SCTP_TCB_LOCK(stcb);
12468                 hold_tcblock = 1;
12469                 SCTP_INP_RUNLOCK(inp);
12470                 if (addr) {
12471                         /* Must locate the net structure if addr given */
12472                         net = sctp_findnet(stcb, addr);
12473                         if (net) {
12474                                 /* validate port was 0 or correct */
12475                                 struct sockaddr_in *sin;
12476
12477                                 sin = (struct sockaddr_in *)addr;
12478                                 if ((sin->sin_port != 0) &&
12479                                     (sin->sin_port != stcb->rport)) {
12480                                         net = NULL;
12481                                 }
12482                         }
12483                         temp_flags |= SCTP_ADDR_OVER;
12484                 } else
12485                         net = stcb->asoc.primary_destination;
12486                 if (addr && (net == NULL)) {
12487                         /* Could not find address, was it legal */
12488                         if (addr->sa_family == AF_INET) {
12489                                 struct sockaddr_in *sin;
12490
12491                                 sin = (struct sockaddr_in *)addr;
12492                                 if (sin->sin_addr.s_addr == 0) {
12493                                         if ((sin->sin_port == 0) ||
12494                                             (sin->sin_port == stcb->rport)) {
12495                                                 net = stcb->asoc.primary_destination;
12496                                         }
12497                                 }
12498                         } else {
12499                                 struct sockaddr_in6 *sin6;
12500
12501                                 sin6 = (struct sockaddr_in6 *)addr;
12502                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
12503                                         if ((sin6->sin6_port == 0) ||
12504                                             (sin6->sin6_port == stcb->rport)) {
12505                                                 net = stcb->asoc.primary_destination;
12506                                         }
12507                                 }
12508                         }
12509                 }
12510                 if (net == NULL) {
12511                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12512                         error = EINVAL;
12513                         goto out_unlocked;
12514                 }
12515         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
12516                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
12517                 if (stcb) {
12518                         if (addr)
12519                                 /*
12520                                  * Must locate the net structure if addr
12521                                  * given
12522                                  */
12523                                 net = sctp_findnet(stcb, addr);
12524                         else
12525                                 net = stcb->asoc.primary_destination;
12526                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
12527                             ((net == NULL) || (addr == NULL))) {
12528                                 struct sockaddr_in *sin;
12529
12530                                 if (addr == NULL) {
12531                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12532                                         error = EINVAL;
12533                                         goto out_unlocked;
12534                                 }
12535                                 sin = (struct sockaddr_in *)addr;
12536                                 /* Validate port is 0 or correct */
12537                                 if ((sin->sin_port != 0) &&
12538                                     (sin->sin_port != stcb->rport)) {
12539                                         net = NULL;
12540                                 }
12541                         }
12542                 }
12543                 hold_tcblock = 0;
12544         } else if (addr) {
12545                 /*-
12546                  * Since we did not use findep we must
12547                  * increment it, and if we don't find a tcb
12548                  * decrement it.
12549                  */
12550                 SCTP_INP_WLOCK(inp);
12551                 SCTP_INP_INCR_REF(inp);
12552                 SCTP_INP_WUNLOCK(inp);
12553                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12554                 if (stcb == NULL) {
12555                         SCTP_INP_WLOCK(inp);
12556                         SCTP_INP_DECR_REF(inp);
12557                         SCTP_INP_WUNLOCK(inp);
12558                 } else {
12559                         hold_tcblock = 1;
12560                 }
12561         }
12562         if ((stcb == NULL) && (addr)) {
12563                 /* Possible implicit send? */
12564                 SCTP_ASOC_CREATE_LOCK(inp);
12565                 create_lock_applied = 1;
12566                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12567                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12568                         /* Should I really unlock ? */
12569                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12570                         error = EINVAL;
12571                         goto out_unlocked;
12572
12573                 }
12574                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12575                     (addr->sa_family == AF_INET6)) {
12576                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12577                         error = EINVAL;
12578                         goto out_unlocked;
12579                 }
12580                 SCTP_INP_WLOCK(inp);
12581                 SCTP_INP_INCR_REF(inp);
12582                 SCTP_INP_WUNLOCK(inp);
12583                 /* With the lock applied look again */
12584                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12585                 if (stcb == NULL) {
12586                         SCTP_INP_WLOCK(inp);
12587                         SCTP_INP_DECR_REF(inp);
12588                         SCTP_INP_WUNLOCK(inp);
12589                 } else {
12590                         hold_tcblock = 1;
12591                 }
12592                 if (t_inp != inp) {
12593                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12594                         error = ENOTCONN;
12595                         goto out_unlocked;
12596                 }
12597         }
12598         if (stcb == NULL) {
12599                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12600                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12601                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12602                         error = ENOTCONN;
12603                         goto out_unlocked;
12604                 }
12605                 if (addr == NULL) {
12606                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12607                         error = ENOENT;
12608                         goto out_unlocked;
12609                 } else {
12610                         /*
12611                          * UDP style, we must go ahead and start the INIT
12612                          * process
12613                          */
12614                         uint32_t vrf_id;
12615
12616                         if ((use_rcvinfo) && (srcv) &&
12617                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12618                             ((srcv->sinfo_flags & SCTP_EOF) &&
12619                             (sndlen == 0)))) {
12620                                 /*-
12621                                  * User asks to abort a non-existant assoc,
12622                                  * or EOF a non-existant assoc with no data
12623                                  */
12624                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12625                                 error = ENOENT;
12626                                 goto out_unlocked;
12627                         }
12628                         /* get an asoc/stcb struct */
12629                         vrf_id = inp->def_vrf_id;
12630 #ifdef INVARIANTS
12631                         if (create_lock_applied == 0) {
12632                                 panic("Error, should hold create lock and I don't?");
12633                         }
12634 #endif
12635                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12636                             p
12637                             );
12638                         if (stcb == NULL) {
12639                                 /* Error is setup for us in the call */
12640                                 goto out_unlocked;
12641                         }
12642                         if (create_lock_applied) {
12643                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12644                                 create_lock_applied = 0;
12645                         } else {
12646                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12647                         }
12648                         /*
12649                          * Turn on queue only flag to prevent data from
12650                          * being sent
12651                          */
12652                         queue_only = 1;
12653                         asoc = &stcb->asoc;
12654                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12655                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12656
12657                         /* initialize authentication params for the assoc */
12658                         sctp_initialize_auth_params(inp, stcb);
12659
12660                         if (control) {
12661                                 /*
12662                                  * see if a init structure exists in cmsg
12663                                  * headers
12664                                  */
12665                                 struct sctp_initmsg initm;
12666                                 int i;
12667
12668                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12669                                     sizeof(initm))) {
12670                                         /*
12671                                          * we have an INIT override of the
12672                                          * default
12673                                          */
12674                                         if (initm.sinit_max_attempts)
12675                                                 asoc->max_init_times = initm.sinit_max_attempts;
12676                                         if (initm.sinit_num_ostreams)
12677                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12678                                         if (initm.sinit_max_instreams)
12679                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12680                                         if (initm.sinit_max_init_timeo)
12681                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12682                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12683                                                 struct sctp_stream_out *tmp_str;
12684                                                 int had_lock = 0;
12685
12686                                                 /* Default is NOT correct */
12687                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12688                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12689                                                 /*
12690                                                  * What happens if this
12691                                                  * fails? we panic ...
12692                                                  */
12693
12694                                                 if (hold_tcblock) {
12695                                                         had_lock = 1;
12696                                                         SCTP_TCB_UNLOCK(stcb);
12697                                                 }
12698                                                 SCTP_MALLOC(tmp_str,
12699                                                     struct sctp_stream_out *,
12700                                                     (asoc->pre_open_streams *
12701                                                     sizeof(struct sctp_stream_out)),
12702                                                     SCTP_M_STRMO);
12703                                                 if (had_lock) {
12704                                                         SCTP_TCB_LOCK(stcb);
12705                                                 }
12706                                                 if (tmp_str != NULL) {
12707                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12708                                                         asoc->strmout = tmp_str;
12709                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12710                                                 } else {
12711                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12712                                                 }
12713                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12714                                                         /*-
12715                                                          * inbound side must be set
12716                                                          * to 0xffff, also NOTE when
12717                                                          * we get the INIT-ACK back
12718                                                          * (for INIT sender) we MUST
12719                                                          * reduce the count
12720                                                          * (streamoutcnt) but first
12721                                                          * check if we sent to any
12722                                                          * of the upper streams that
12723                                                          * were dropped (if some
12724                                                          * were). Those that were
12725                                                          * dropped must be notified
12726                                                          * to the upper layer as
12727                                                          * failed to send.
12728                                                          */
12729                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12730                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12731                                                         asoc->strmout[i].stream_no = i;
12732                                                         asoc->strmout[i].last_msg_incomplete = 0;
12733                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12734                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12735                                                 }
12736                                         }
12737                                 }
12738                         }
12739                         hold_tcblock = 1;
12740                         /* out with the INIT */
12741                         queue_only_for_init = 1;
12742                         /*-
12743                          * we may want to dig in after this call and adjust the MTU
12744                          * value. It defaulted to 1500 (constant) but the ro
12745                          * structure may now have an update and thus we may need to
12746                          * change it BEFORE we append the message.
12747                          */
12748                         net = stcb->asoc.primary_destination;
12749                         asoc = &stcb->asoc;
12750                 }
12751         }
12752         if ((SCTP_SO_IS_NBIO(so)
12753             || (flags & MSG_NBIO)
12754             )) {
12755                 non_blocking = 1;
12756         }
12757         asoc = &stcb->asoc;
12758         atomic_add_int(&stcb->total_sends, 1);
12759
12760         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12761                 if (sndlen > asoc->smallest_mtu) {
12762                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12763                         error = EMSGSIZE;
12764                         goto out_unlocked;
12765                 }
12766         }
12767         /* would we block? */
12768         if (non_blocking) {
12769                 if (hold_tcblock == 0) {
12770                         SCTP_TCB_LOCK(stcb);
12771                         hold_tcblock = 1;
12772                 }
12773                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12774                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12775                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12776                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12777                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12778                                 error = EMSGSIZE;
12779                         else
12780                                 error = EWOULDBLOCK;
12781                         goto out_unlocked;
12782                 }
12783                 stcb->asoc.sb_send_resv += sndlen;
12784                 SCTP_TCB_UNLOCK(stcb);
12785                 hold_tcblock = 0;
12786         } else {
12787                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12788         }
12789         local_soresv = sndlen;
12790         /* Keep the stcb from being freed under our feet */
12791         if (free_cnt_applied) {
12792 #ifdef INVARIANTS
12793                 panic("refcnt already incremented");
12794 #else
12795                 printf("refcnt:1 already incremented?\n");
12796 #endif
12797         } else {
12798                 atomic_add_int(&stcb->asoc.refcnt, 1);
12799                 free_cnt_applied = 1;
12800         }
12801         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12802                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12803                 error = ECONNRESET;
12804                 goto out_unlocked;
12805         }
12806         if (create_lock_applied) {
12807                 SCTP_ASOC_CREATE_UNLOCK(inp);
12808                 create_lock_applied = 0;
12809         }
12810         if (asoc->stream_reset_outstanding) {
12811                 /*
12812                  * Can't queue any data while stream reset is underway.
12813                  */
12814                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12815                 error = EAGAIN;
12816                 goto out_unlocked;
12817         }
12818         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12819             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12820                 queue_only = 1;
12821         }
12822         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12823                 /* Grab the default stuff from the asoc */
12824                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12825         }
12826         /* we are now done with all control */
12827         if (control) {
12828                 sctp_m_freem(control);
12829                 control = NULL;
12830         }
12831         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12832             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12833             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12834             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12835                 if ((use_rcvinfo) &&
12836                     (srcv->sinfo_flags & SCTP_ABORT)) {
12837                         ;
12838                 } else {
12839                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12840                         error = ECONNRESET;
12841                         goto out_unlocked;
12842                 }
12843         }
12844         /* Ok, we will attempt a msgsnd :> */
12845         if (p) {
12846                 p->td_ru.ru_msgsnd++;
12847         }
12848         if (stcb) {
12849                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12850                         net = stcb->asoc.primary_destination;
12851                 }
12852         }
12853         if (net == NULL) {
12854                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12855                 error = EINVAL;
12856                 goto out_unlocked;
12857         }
12858         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12859                 /*-
12860                  * CMT: Added check for CMT above. net above is the primary
12861                  * dest. If CMT is ON, sender should always attempt to send
12862                  * with the output routine sctp_fill_outqueue() that loops
12863                  * through all destination addresses. Therefore, if CMT is
12864                  * ON, queue_only is NOT set to 1 here, so that
12865                  * sctp_chunk_output() can be called below.
12866                  */
12867                 queue_only = 1;
12868         } else if (asoc->ifp_had_enobuf) {
12869                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12870                 if (net->flight_size > (net->mtu * 2))
12871                         queue_only = 1;
12872                 asoc->ifp_had_enobuf = 0;
12873         } else {
12874                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12875                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12876         }
12877         /* Are we aborting? */
12878         if (srcv->sinfo_flags & SCTP_ABORT) {
12879                 struct mbuf *mm;
12880                 int tot_demand, tot_out = 0, max_out;
12881
12882                 SCTP_STAT_INCR(sctps_sends_with_abort);
12883                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12884                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12885                         /* It has to be up before we abort */
12886                         /* how big is the user initiated abort? */
12887                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12888                         error = EINVAL;
12889                         goto out;
12890                 }
12891                 if (hold_tcblock) {
12892                         SCTP_TCB_UNLOCK(stcb);
12893                         hold_tcblock = 0;
12894                 }
12895                 if (top) {
12896                         struct mbuf *cntm = NULL;
12897
12898                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12899                         if (sndlen != 0) {
12900                                 cntm = top;
12901                                 while (cntm) {
12902                                         tot_out += SCTP_BUF_LEN(cntm);
12903                                         cntm = SCTP_BUF_NEXT(cntm);
12904                                 }
12905                         }
12906                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12907                 } else {
12908                         /* Must fit in a MTU */
12909                         tot_out = sndlen;
12910                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12911                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12912                                 /* To big */
12913                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12914                                 error = EMSGSIZE;
12915                                 goto out;
12916                         }
12917                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12918                 }
12919                 if (mm == NULL) {
12920                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12921                         error = ENOMEM;
12922                         goto out;
12923                 }
12924                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12925                 max_out -= sizeof(struct sctp_abort_msg);
12926                 if (tot_out > max_out) {
12927                         tot_out = max_out;
12928                 }
12929                 if (mm) {
12930                         struct sctp_paramhdr *ph;
12931
12932                         /* now move forward the data pointer */
12933                         ph = mtod(mm, struct sctp_paramhdr *);
12934                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12935                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12936                         ph++;
12937                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12938                         if (top == NULL) {
12939                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12940                                 if (error) {
12941                                         /*-
12942                                          * Here if we can't get his data we
12943                                          * still abort we just don't get to
12944                                          * send the users note :-0
12945                                          */
12946                                         sctp_m_freem(mm);
12947                                         mm = NULL;
12948                                 }
12949                         } else {
12950                                 if (sndlen != 0) {
12951                                         SCTP_BUF_NEXT(mm) = top;
12952                                 }
12953                         }
12954                 }
12955                 if (hold_tcblock == 0) {
12956                         SCTP_TCB_LOCK(stcb);
12957                         hold_tcblock = 1;
12958                 }
12959                 atomic_add_int(&stcb->asoc.refcnt, -1);
12960                 free_cnt_applied = 0;
12961                 /* release this lock, otherwise we hang on ourselves */
12962                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12963                     SCTP_RESPONSE_TO_USER_REQ,
12964                     mm, SCTP_SO_LOCKED);
12965                 /* now relock the stcb so everything is sane */
12966                 hold_tcblock = 0;
12967                 stcb = NULL;
12968                 /*
12969                  * In this case top is already chained to mm avoid double
12970                  * free, since we free it below if top != NULL and driver
12971                  * would free it after sending the packet out
12972                  */
12973                 if (sndlen != 0) {
12974                         top = NULL;
12975                 }
12976                 goto out_unlocked;
12977         }
12978         /* Calculate the maximum we can send */
12979         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12980         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12981                 if (non_blocking) {
12982                         /* we already checked for non-blocking above. */
12983                         max_len = sndlen;
12984                 } else {
12985                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12986                 }
12987         } else {
12988                 max_len = 0;
12989         }
12990         if (hold_tcblock) {
12991                 SCTP_TCB_UNLOCK(stcb);
12992                 hold_tcblock = 0;
12993         }
12994         /* Is the stream no. valid? */
12995         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12996                 /* Invalid stream number */
12997                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12998                 error = EINVAL;
12999                 goto out_unlocked;
13000         }
13001         if (asoc->strmout == NULL) {
13002                 /* huh? software error */
13003                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13004                 error = EFAULT;
13005                 goto out_unlocked;
13006         }
13007         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13008         if ((user_marks_eor == 0) &&
13009             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13010                 /* It will NEVER fit */
13011                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13012                 error = EMSGSIZE;
13013                 goto out_unlocked;
13014         }
13015         if ((uio == NULL) && user_marks_eor) {
13016                 /*-
13017                  * We do not support eeor mode for
13018                  * sending with mbuf chains (like sendfile).
13019                  */
13020                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13021                 error = EINVAL;
13022                 goto out_unlocked;
13023         }
13024         if (user_marks_eor) {
13025                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13026         } else {
13027                 /*-
13028                  * For non-eeor the whole message must fit in
13029                  * the socket send buffer.
13030                  */
13031                 local_add_more = sndlen;
13032         }
13033         len = 0;
13034         if (non_blocking) {
13035                 goto skip_preblock;
13036         }
13037         if (((max_len <= local_add_more) &&
13038             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13039             (max_len == 0) ||
13040             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13041                 /* No room right now ! */
13042                 SOCKBUF_LOCK(&so->so_snd);
13043                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13044                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13045                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13046                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13047                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13048                             inqueue_bytes,
13049                             local_add_more,
13050                             stcb->asoc.stream_queue_cnt,
13051                             stcb->asoc.chunks_on_out_queue,
13052                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13053                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13054                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13055                         }
13056                         be.error = 0;
13057                         stcb->block_entry = &be;
13058                         error = sbwait(&so->so_snd);
13059                         stcb->block_entry = NULL;
13060                         if (error || so->so_error || be.error) {
13061                                 if (error == 0) {
13062                                         if (so->so_error)
13063                                                 error = so->so_error;
13064                                         if (be.error) {
13065                                                 error = be.error;
13066                                         }
13067                                 }
13068                                 SOCKBUF_UNLOCK(&so->so_snd);
13069                                 goto out_unlocked;
13070                         }
13071                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13072                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13073                                     so, asoc, stcb->asoc.total_output_queue_size);
13074                         }
13075                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13076                                 goto out_unlocked;
13077                         }
13078                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13079                 }
13080                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13081                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13082                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13083                 } else {
13084                         max_len = 0;
13085                 }
13086                 SOCKBUF_UNLOCK(&so->so_snd);
13087         }
13088 skip_preblock:
13089         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13090                 goto out_unlocked;
13091         }
13092         /*
13093          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13094          * case NOTE: uio will be null when top/mbuf is passed
13095          */
13096         if (sndlen == 0) {
13097                 if (srcv->sinfo_flags & SCTP_EOF) {
13098                         got_all_of_the_send = 1;
13099                         goto dataless_eof;
13100                 } else {
13101                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13102                         error = EINVAL;
13103                         goto out;
13104                 }
13105         }
13106         if (top == NULL) {
13107                 struct sctp_stream_queue_pending *sp;
13108                 struct sctp_stream_out *strm;
13109                 uint32_t sndout, initial_out;
13110
13111                 initial_out = uio->uio_resid;
13112
13113                 SCTP_TCB_SEND_LOCK(stcb);
13114                 if ((asoc->stream_locked) &&
13115                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13116                         SCTP_TCB_SEND_UNLOCK(stcb);
13117                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13118                         error = EINVAL;
13119                         goto out;
13120                 }
13121                 SCTP_TCB_SEND_UNLOCK(stcb);
13122
13123                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13124                 if (strm->last_msg_incomplete == 0) {
13125         do_a_copy_in:
13126                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13127                         if ((sp == NULL) || (error)) {
13128                                 goto out;
13129                         }
13130                         SCTP_TCB_SEND_LOCK(stcb);
13131                         if (sp->msg_is_complete) {
13132                                 strm->last_msg_incomplete = 0;
13133                                 asoc->stream_locked = 0;
13134                         } else {
13135                                 /*
13136                                  * Just got locked to this guy in case of an
13137                                  * interrupt.
13138                                  */
13139                                 strm->last_msg_incomplete = 1;
13140                                 asoc->stream_locked = 1;
13141                                 asoc->stream_locked_on = srcv->sinfo_stream;
13142                                 sp->sender_all_done = 0;
13143                         }
13144                         sctp_snd_sb_alloc(stcb, sp->length);
13145                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13146                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13147                                 sp->strseq = strm->next_sequence_sent;
13148                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13149                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13150                                             (uintptr_t) stcb, sp->length,
13151                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13152                                 }
13153                                 strm->next_sequence_sent++;
13154                         } else {
13155                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13156                         }
13157                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13158                         if ((strm->next_spoke.tqe_next == NULL) &&
13159                             (strm->next_spoke.tqe_prev == NULL)) {
13160                                 /* Not on wheel, insert */
13161                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
13162                         }
13163                         SCTP_TCB_SEND_UNLOCK(stcb);
13164                 } else {
13165                         SCTP_TCB_SEND_LOCK(stcb);
13166                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13167                         SCTP_TCB_SEND_UNLOCK(stcb);
13168                         if (sp == NULL) {
13169                                 /* ???? Huh ??? last msg is gone */
13170 #ifdef INVARIANTS
13171                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13172 #else
13173                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13174                                 strm->last_msg_incomplete = 0;
13175 #endif
13176                                 goto do_a_copy_in;
13177
13178                         }
13179                 }
13180                 while (uio->uio_resid > 0) {
13181                         /* How much room do we have? */
13182                         struct mbuf *new_tail, *mm;
13183
13184                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13185                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13186                         else
13187                                 max_len = 0;
13188
13189                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13190                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13191                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13192                                 sndout = 0;
13193                                 new_tail = NULL;
13194                                 if (hold_tcblock) {
13195                                         SCTP_TCB_UNLOCK(stcb);
13196                                         hold_tcblock = 0;
13197                                 }
13198                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13199                                 if ((mm == NULL) || error) {
13200                                         if (mm) {
13201                                                 sctp_m_freem(mm);
13202                                         }
13203                                         goto out;
13204                                 }
13205                                 /* Update the mbuf and count */
13206                                 SCTP_TCB_SEND_LOCK(stcb);
13207                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13208                                         /*
13209                                          * we need to get out. Peer probably
13210                                          * aborted.
13211                                          */
13212                                         sctp_m_freem(mm);
13213                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13214                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13215                                                 error = ECONNRESET;
13216                                         }
13217                                         SCTP_TCB_SEND_UNLOCK(stcb);
13218                                         goto out;
13219                                 }
13220                                 if (sp->tail_mbuf) {
13221                                         /* tack it to the end */
13222                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13223                                         sp->tail_mbuf = new_tail;
13224                                 } else {
13225                                         /* A stolen mbuf */
13226                                         sp->data = mm;
13227                                         sp->tail_mbuf = new_tail;
13228                                 }
13229                                 sctp_snd_sb_alloc(stcb, sndout);
13230                                 atomic_add_int(&sp->length, sndout);
13231                                 len += sndout;
13232
13233                                 /* Did we reach EOR? */
13234                                 if ((uio->uio_resid == 0) &&
13235                                     ((user_marks_eor == 0) ||
13236                                     (srcv->sinfo_flags & SCTP_EOF) ||
13237                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13238                                         sp->msg_is_complete = 1;
13239                                 } else {
13240                                         sp->msg_is_complete = 0;
13241                                 }
13242                                 SCTP_TCB_SEND_UNLOCK(stcb);
13243                         }
13244                         if (uio->uio_resid == 0) {
13245                                 /* got it all? */
13246                                 continue;
13247                         }
13248                         /* PR-SCTP? */
13249                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13250                                 /*
13251                                  * This is ugly but we must assure locking
13252                                  * order
13253                                  */
13254                                 if (hold_tcblock == 0) {
13255                                         SCTP_TCB_LOCK(stcb);
13256                                         hold_tcblock = 1;
13257                                 }
13258                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13259                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13260                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13261                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13262                                 else
13263                                         max_len = 0;
13264                                 if (max_len > 0) {
13265                                         continue;
13266                                 }
13267                                 SCTP_TCB_UNLOCK(stcb);
13268                                 hold_tcblock = 0;
13269                         }
13270                         /* wait for space now */
13271                         if (non_blocking) {
13272                                 /* Non-blocking io in place out */
13273                                 goto skip_out_eof;
13274                         }
13275                         if ((net->flight_size > net->cwnd) &&
13276                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13277                                 queue_only = 1;
13278                         } else if (asoc->ifp_had_enobuf) {
13279                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13280                                 if (net->flight_size > (net->mtu * 2)) {
13281                                         queue_only = 1;
13282                                 } else {
13283                                         queue_only = 0;
13284                                 }
13285                                 asoc->ifp_had_enobuf = 0;
13286                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13287                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13288                         } else {
13289                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13290                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13291                                 if (net->flight_size > net->cwnd) {
13292                                         queue_only = 1;
13293                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13294                                 } else {
13295                                         queue_only = 0;
13296                                 }
13297                         }
13298                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13299                             (stcb->asoc.total_flight > 0) &&
13300                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13301                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13302
13303                                 /*-
13304                                  * Ok, Nagle is set on and we have data outstanding.
13305                                  * Don't send anything and let SACKs drive out the
13306                                  * data unless wen have a "full" segment to send.
13307                                  */
13308                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13309                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13310                                 }
13311                                 SCTP_STAT_INCR(sctps_naglequeued);
13312                                 nagle_applies = 1;
13313                         } else {
13314                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13315                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13316                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13317                                 }
13318                                 SCTP_STAT_INCR(sctps_naglesent);
13319                                 nagle_applies = 0;
13320                         }
13321                         /* What about the INIT, send it maybe */
13322                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13323
13324                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13325                                     nagle_applies, un_sent);
13326                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13327                                     stcb->asoc.total_flight,
13328                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13329                         }
13330                         if (queue_only_for_init) {
13331                                 if (hold_tcblock == 0) {
13332                                         SCTP_TCB_LOCK(stcb);
13333                                         hold_tcblock = 1;
13334                                 }
13335                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13336                                         /* a collision took us forward? */
13337                                         queue_only_for_init = 0;
13338                                         queue_only = 0;
13339                                 } else {
13340                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13341                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13342                                         queue_only_for_init = 0;
13343                                         queue_only = 1;
13344                                 }
13345                         }
13346                         if ((queue_only == 0) && (nagle_applies == 0)) {
13347                                 /*-
13348                                  * need to start chunk output
13349                                  * before blocking.. note that if
13350                                  * a lock is already applied, then
13351                                  * the input via the net is happening
13352                                  * and I don't need to start output :-D
13353                                  */
13354                                 if (hold_tcblock == 0) {
13355                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13356                                                 hold_tcblock = 1;
13357                                                 sctp_chunk_output(inp,
13358                                                     stcb,
13359                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13360                                         }
13361                                 } else {
13362                                         sctp_chunk_output(inp,
13363                                             stcb,
13364                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13365                                 }
13366                                 if (hold_tcblock == 1) {
13367                                         SCTP_TCB_UNLOCK(stcb);
13368                                         hold_tcblock = 0;
13369                                 }
13370                         }
13371                         SOCKBUF_LOCK(&so->so_snd);
13372                         /*-
13373                          * This is a bit strange, but I think it will
13374                          * work. The total_output_queue_size is locked and
13375                          * protected by the TCB_LOCK, which we just released.
13376                          * There is a race that can occur between releasing it
13377                          * above, and me getting the socket lock, where sacks
13378                          * come in but we have not put the SB_WAIT on the
13379                          * so_snd buffer to get the wakeup. After the LOCK
13380                          * is applied the sack_processing will also need to
13381                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13382                          * once we have the socket buffer lock if we recheck the
13383                          * size we KNOW we will get to sleep safely with the
13384                          * wakeup flag in place.
13385                          */
13386                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13387                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13388                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13389                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13390                                             so, asoc, uio->uio_resid);
13391                                 }
13392                                 be.error = 0;
13393                                 stcb->block_entry = &be;
13394                                 error = sbwait(&so->so_snd);
13395                                 stcb->block_entry = NULL;
13396
13397                                 if (error || so->so_error || be.error) {
13398                                         if (error == 0) {
13399                                                 if (so->so_error)
13400                                                         error = so->so_error;
13401                                                 if (be.error) {
13402                                                         error = be.error;
13403                                                 }
13404                                         }
13405                                         SOCKBUF_UNLOCK(&so->so_snd);
13406                                         goto out_unlocked;
13407                                 }
13408                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13409                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13410                                             so, asoc, stcb->asoc.total_output_queue_size);
13411                                 }
13412                         }
13413                         SOCKBUF_UNLOCK(&so->so_snd);
13414                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13415                                 goto out_unlocked;
13416                         }
13417                 }
13418                 SCTP_TCB_SEND_LOCK(stcb);
13419                 if (sp) {
13420                         if (sp->msg_is_complete == 0) {
13421                                 strm->last_msg_incomplete = 1;
13422                                 asoc->stream_locked = 1;
13423                                 asoc->stream_locked_on = srcv->sinfo_stream;
13424                         } else {
13425                                 sp->sender_all_done = 1;
13426                                 strm->last_msg_incomplete = 0;
13427                                 asoc->stream_locked = 0;
13428                         }
13429                 } else {
13430                         SCTP_PRINTF("Huh no sp TSNH?\n");
13431                         strm->last_msg_incomplete = 0;
13432                         asoc->stream_locked = 0;
13433                 }
13434                 SCTP_TCB_SEND_UNLOCK(stcb);
13435                 if (uio->uio_resid == 0) {
13436                         got_all_of_the_send = 1;
13437                 }
13438         } else if (top) {
13439                 /* We send in a 0, since we do NOT have any locks */
13440                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13441                 top = NULL;
13442                 if (srcv->sinfo_flags & SCTP_EOF) {
13443                         /*
13444                          * This should only happen for Panda for the mbuf
13445                          * send case, which does NOT yet support EEOR mode.
13446                          * Thus, we can just set this flag to do the proper
13447                          * EOF handling.
13448                          */
13449                         got_all_of_the_send = 1;
13450                 }
13451         }
13452         if (error) {
13453                 goto out;
13454         }
13455 dataless_eof:
13456         /* EOF thing ? */
13457         if ((srcv->sinfo_flags & SCTP_EOF) &&
13458             (got_all_of_the_send == 1) &&
13459             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13460                 int cnt;
13461
13462                 SCTP_STAT_INCR(sctps_sends_with_eof);
13463                 error = 0;
13464                 if (hold_tcblock == 0) {
13465                         SCTP_TCB_LOCK(stcb);
13466                         hold_tcblock = 1;
13467                 }
13468                 cnt = sctp_is_there_unsent_data(stcb);
13469                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13470                     TAILQ_EMPTY(&asoc->sent_queue) &&
13471                     (cnt == 0)) {
13472                         if (asoc->locked_on_sending) {
13473                                 goto abort_anyway;
13474                         }
13475                         /* there is nothing queued to send, so I'm done... */
13476                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13477                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13478                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13479                                 /* only send SHUTDOWN the first time through */
13480                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13481                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13482                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13483                                 }
13484                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13485                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13486                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13487                                     asoc->primary_destination);
13488                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13489                                     asoc->primary_destination);
13490                         }
13491                 } else {
13492                         /*-
13493                          * we still got (or just got) data to send, so set
13494                          * SHUTDOWN_PENDING
13495                          */
13496                         /*-
13497                          * XXX sockets draft says that SCTP_EOF should be
13498                          * sent with no data.  currently, we will allow user
13499                          * data to be sent first and move to
13500                          * SHUTDOWN-PENDING
13501                          */
13502                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13503                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13504                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13505                                 if (hold_tcblock == 0) {
13506                                         SCTP_TCB_LOCK(stcb);
13507                                         hold_tcblock = 1;
13508                                 }
13509                                 if (asoc->locked_on_sending) {
13510                                         /* Locked to send out the data */
13511                                         struct sctp_stream_queue_pending *sp;
13512
13513                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13514                                         if (sp) {
13515                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13516                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13517                                         }
13518                                 }
13519                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13520                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13521                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13522                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13523                         abort_anyway:
13524                                         if (free_cnt_applied) {
13525                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13526                                                 free_cnt_applied = 0;
13527                                         }
13528                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13529                                             SCTP_RESPONSE_TO_USER_REQ,
13530                                             NULL, SCTP_SO_LOCKED);
13531                                         /*
13532                                          * now relock the stcb so everything
13533                                          * is sane
13534                                          */
13535                                         hold_tcblock = 0;
13536                                         stcb = NULL;
13537                                         goto out;
13538                                 }
13539                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13540                                     asoc->primary_destination);
13541                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13542                         }
13543                 }
13544         }
13545 skip_out_eof:
13546         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13547                 some_on_control = 1;
13548         }
13549         if ((net->flight_size > net->cwnd) &&
13550             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13551                 queue_only = 1;
13552         } else if (asoc->ifp_had_enobuf) {
13553                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13554                 if (net->flight_size > (net->mtu * 2)) {
13555                         queue_only = 1;
13556                 } else {
13557                         queue_only = 0;
13558                 }
13559                 asoc->ifp_had_enobuf = 0;
13560                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13561                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13562         } else {
13563                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13564                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13565                 if (net->flight_size > net->cwnd) {
13566                         queue_only = 1;
13567                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13568                 } else {
13569                         queue_only = 0;
13570                 }
13571         }
13572         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13573             (stcb->asoc.total_flight > 0) &&
13574             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13575             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13576                 /*-
13577                  * Ok, Nagle is set on and we have data outstanding.
13578                  * Don't send anything and let SACKs drive out the
13579                  * data unless wen have a "full" segment to send.
13580                  */
13581                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13582                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13583                 }
13584                 SCTP_STAT_INCR(sctps_naglequeued);
13585                 nagle_applies = 1;
13586         } else {
13587                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13588                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13589                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13590                 }
13591                 SCTP_STAT_INCR(sctps_naglesent);
13592                 nagle_applies = 0;
13593         }
13594         if (queue_only_for_init) {
13595                 if (hold_tcblock == 0) {
13596                         SCTP_TCB_LOCK(stcb);
13597                         hold_tcblock = 1;
13598                 }
13599                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13600                         /* a collision took us forward? */
13601                         queue_only_for_init = 0;
13602                         queue_only = 0;
13603                 } else {
13604                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13605                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13606                         queue_only_for_init = 0;
13607                         queue_only = 1;
13608                 }
13609         }
13610         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13611                 /* we can attempt to send too. */
13612                 if (hold_tcblock == 0) {
13613                         /*
13614                          * If there is activity recv'ing sacks no need to
13615                          * send
13616                          */
13617                         if (SCTP_TCB_TRYLOCK(stcb)) {
13618                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13619                                 hold_tcblock = 1;
13620                         }
13621                 } else {
13622                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13623                 }
13624         } else if ((queue_only == 0) &&
13625                     (stcb->asoc.peers_rwnd == 0) &&
13626             (stcb->asoc.total_flight == 0)) {
13627                 /* We get to have a probe outstanding */
13628                 if (hold_tcblock == 0) {
13629                         hold_tcblock = 1;
13630                         SCTP_TCB_LOCK(stcb);
13631                 }
13632                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13633         } else if (some_on_control) {
13634                 int num_out, reason, frag_point;
13635
13636                 /* Here we do control only */
13637                 if (hold_tcblock == 0) {
13638                         hold_tcblock = 1;
13639                         SCTP_TCB_LOCK(stcb);
13640                 }
13641                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13642                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13643                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13644         }
13645         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13646             queue_only, stcb->asoc.peers_rwnd, un_sent,
13647             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13648             stcb->asoc.total_output_queue_size, error);
13649
13650 out:
13651 out_unlocked:
13652
13653         if (local_soresv && stcb) {
13654                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13655                 local_soresv = 0;
13656         }
13657         if (create_lock_applied) {
13658                 SCTP_ASOC_CREATE_UNLOCK(inp);
13659                 create_lock_applied = 0;
13660         }
13661         if ((stcb) && hold_tcblock) {
13662                 SCTP_TCB_UNLOCK(stcb);
13663         }
13664         if (stcb && free_cnt_applied) {
13665                 atomic_add_int(&stcb->asoc.refcnt, -1);
13666         }
13667 #ifdef INVARIANTS
13668         if (stcb) {
13669                 if (mtx_owned(&stcb->tcb_mtx)) {
13670                         panic("Leaving with tcb mtx owned?");
13671                 }
13672                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13673                         panic("Leaving with tcb send mtx owned?");
13674                 }
13675         }
13676 #endif
13677         if (top) {
13678                 sctp_m_freem(top);
13679         }
13680         if (control) {
13681                 sctp_m_freem(control);
13682         }
13683         return (error);
13684 }
13685
13686
13687 /*
13688  * generate an AUTHentication chunk, if required
13689  */
13690 struct mbuf *
13691 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13692     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13693     struct sctp_tcb *stcb, uint8_t chunk)
13694 {
13695         struct mbuf *m_auth;
13696         struct sctp_auth_chunk *auth;
13697         int chunk_len;
13698
13699         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13700             (stcb == NULL))
13701                 return (m);
13702
13703         /* sysctl disabled auth? */
13704         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13705                 return (m);
13706
13707         /* peer doesn't do auth... */
13708         if (!stcb->asoc.peer_supports_auth) {
13709                 return (m);
13710         }
13711         /* does the requested chunk require auth? */
13712         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13713                 return (m);
13714         }
13715         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13716         if (m_auth == NULL) {
13717                 /* no mbuf's */
13718                 return (m);
13719         }
13720         /* reserve some space if this will be the first mbuf */
13721         if (m == NULL)
13722                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13723         /* fill in the AUTH chunk details */
13724         auth = mtod(m_auth, struct sctp_auth_chunk *);
13725         bzero(auth, sizeof(*auth));
13726         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13727         auth->ch.chunk_flags = 0;
13728         chunk_len = sizeof(*auth) +
13729             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13730         auth->ch.chunk_length = htons(chunk_len);
13731         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13732         /* key id and hmac digest will be computed and filled in upon send */
13733
13734         /* save the offset where the auth was inserted into the chain */
13735         if (m != NULL) {
13736                 struct mbuf *cn;
13737
13738                 *offset = 0;
13739                 cn = m;
13740                 while (cn) {
13741                         *offset += SCTP_BUF_LEN(cn);
13742                         cn = SCTP_BUF_NEXT(cn);
13743                 }
13744         } else
13745                 *offset = 0;
13746
13747         /* update length and return pointer to the auth chunk */
13748         SCTP_BUF_LEN(m_auth) = chunk_len;
13749         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13750         if (auth_ret != NULL)
13751                 *auth_ret = auth;
13752
13753         return (m);
13754 }
13755
13756 #ifdef INET6
13757 int
13758 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13759 {
13760         struct nd_prefix *pfx = NULL;
13761         struct nd_pfxrouter *pfxrtr = NULL;
13762         struct sockaddr_in6 gw6;
13763
13764         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13765                 return (0);
13766
13767         /* get prefix entry of address */
13768         LIST_FOREACH(pfx, &MODULE_GLOBAL(MOD_INET6, nd_prefix), ndpr_entry) {
13769                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13770                         continue;
13771                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13772                     &src6->sin6_addr, &pfx->ndpr_mask))
13773                         break;
13774         }
13775         /* no prefix entry in the prefix list */
13776         if (pfx == NULL) {
13777                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13778                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13779                 return (0);
13780         }
13781         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13782         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13783
13784         /* search installed gateway from prefix entry */
13785         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13786             pfxrtr->pfr_next) {
13787                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13788                 gw6.sin6_family = AF_INET6;
13789                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13790                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13791                     sizeof(struct in6_addr));
13792                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13793                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13794                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13795                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13796                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13797                     ro->ro_rt->rt_gateway)) {
13798                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13799                         return (1);
13800                 }
13801         }
13802         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13803         return (0);
13804 }
13805
13806 #endif
13807
13808 int
13809 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13810 {
13811         struct sockaddr_in *sin, *mask;
13812         struct ifaddr *ifa;
13813         struct in_addr srcnetaddr, gwnetaddr;
13814
13815         if (ro == NULL || ro->ro_rt == NULL ||
13816             sifa->address.sa.sa_family != AF_INET) {
13817                 return (0);
13818         }
13819         ifa = (struct ifaddr *)sifa->ifa;
13820         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13821         sin = (struct sockaddr_in *)&sifa->address.sin;
13822         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13823         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13824         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13825         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13826
13827         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13828         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13829         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13830         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13831         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13832         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13833                 return (1);
13834         }
13835         return (0);
13836 }