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->ro_rt), 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->ro_rt), 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(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
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         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4415         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4416 }
4417
4418 struct mbuf *
4419 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4420     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4421 {
4422         /*
4423          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4424          * being equal to the beginning of the params i.e. (iphlen +
4425          * sizeof(struct sctp_init_msg) parse through the parameters to the
4426          * end of the mbuf verifying that all parameters are known.
4427          *
4428          * For unknown parameters build and return a mbuf with
4429          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4430          * processing this chunk stop, and set *abort_processing to 1.
4431          *
4432          * By having param_offset be pre-set to where parameters begin it is
4433          * hoped that this routine may be reused in the future by new
4434          * features.
4435          */
4436         struct sctp_paramhdr *phdr, params;
4437
4438         struct mbuf *mat, *op_err;
4439         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4440         int at, limit, pad_needed;
4441         uint16_t ptype, plen, padded_size;
4442         int err_at;
4443
4444         *abort_processing = 0;
4445         mat = in_initpkt;
4446         err_at = 0;
4447         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4448         at = param_offset;
4449         op_err = NULL;
4450         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4451         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4452         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4453                 ptype = ntohs(phdr->param_type);
4454                 plen = ntohs(phdr->param_length);
4455                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4456                         /* wacked parameter */
4457                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4458                         goto invalid_size;
4459                 }
4460                 limit -= SCTP_SIZE32(plen);
4461                 /*-
4462                  * All parameters for all chunks that we know/understand are
4463                  * listed here. We process them other places and make
4464                  * appropriate stop actions per the upper bits. However this
4465                  * is the generic routine processor's can call to get back
4466                  * an operr.. to either incorporate (init-ack) or send.
4467                  */
4468                 padded_size = SCTP_SIZE32(plen);
4469                 switch (ptype) {
4470                         /* Param's with variable size */
4471                 case SCTP_HEARTBEAT_INFO:
4472                 case SCTP_STATE_COOKIE:
4473                 case SCTP_UNRECOG_PARAM:
4474                 case SCTP_ERROR_CAUSE_IND:
4475                         /* ok skip fwd */
4476                         at += padded_size;
4477                         break;
4478                         /* Param's with variable size within a range */
4479                 case SCTP_CHUNK_LIST:
4480                 case SCTP_SUPPORTED_CHUNK_EXT:
4481                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4482                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4483                                 goto invalid_size;
4484                         }
4485                         at += padded_size;
4486                         break;
4487                 case SCTP_SUPPORTED_ADDRTYPE:
4488                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4489                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4490                                 goto invalid_size;
4491                         }
4492                         at += padded_size;
4493                         break;
4494                 case SCTP_RANDOM:
4495                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4496                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4497                                 goto invalid_size;
4498                         }
4499                         at += padded_size;
4500                         break;
4501                 case SCTP_SET_PRIM_ADDR:
4502                 case SCTP_DEL_IP_ADDRESS:
4503                 case SCTP_ADD_IP_ADDRESS:
4504                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4505                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4506                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4507                                 goto invalid_size;
4508                         }
4509                         at += padded_size;
4510                         break;
4511                         /* Param's with a fixed size */
4512                 case SCTP_IPV4_ADDRESS:
4513                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4514                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4515                                 goto invalid_size;
4516                         }
4517                         at += padded_size;
4518                         break;
4519                 case SCTP_IPV6_ADDRESS:
4520                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4521                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4522                                 goto invalid_size;
4523                         }
4524                         at += padded_size;
4525                         break;
4526                 case SCTP_COOKIE_PRESERVE:
4527                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4528                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4529                                 goto invalid_size;
4530                         }
4531                         at += padded_size;
4532                         break;
4533                 case SCTP_HAS_NAT_SUPPORT:
4534                         *nat_friendly = 1;
4535                         /* fall through */
4536                 case SCTP_ECN_NONCE_SUPPORTED:
4537                 case SCTP_PRSCTP_SUPPORTED:
4538
4539                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4540                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4541                                 goto invalid_size;
4542                         }
4543                         at += padded_size;
4544                         break;
4545                 case SCTP_ECN_CAPABLE:
4546                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4547                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4548                                 goto invalid_size;
4549                         }
4550                         at += padded_size;
4551                         break;
4552                 case SCTP_ULP_ADAPTATION:
4553                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4554                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4555                                 goto invalid_size;
4556                         }
4557                         at += padded_size;
4558                         break;
4559                 case SCTP_SUCCESS_REPORT:
4560                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4561                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4562                                 goto invalid_size;
4563                         }
4564                         at += padded_size;
4565                         break;
4566                 case SCTP_HOSTNAME_ADDRESS:
4567                         {
4568                                 /* We can NOT handle HOST NAME addresses!! */
4569                                 int l_len;
4570
4571                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4572                                 *abort_processing = 1;
4573                                 if (op_err == NULL) {
4574                                         /* Ok need to try to get a mbuf */
4575 #ifdef INET6
4576                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4577 #else
4578                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4579 #endif
4580                                         l_len += plen;
4581                                         l_len += sizeof(struct sctp_paramhdr);
4582                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4583                                         if (op_err) {
4584                                                 SCTP_BUF_LEN(op_err) = 0;
4585                                                 /*
4586                                                  * pre-reserve space for ip
4587                                                  * and sctp header  and
4588                                                  * chunk hdr
4589                                                  */
4590 #ifdef INET6
4591                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4592 #else
4593                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4594 #endif
4595                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4596                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4597                                         }
4598                                 }
4599                                 if (op_err) {
4600                                         /* If we have space */
4601                                         struct sctp_paramhdr s;
4602
4603                                         if (err_at % 4) {
4604                                                 uint32_t cpthis = 0;
4605
4606                                                 pad_needed = 4 - (err_at % 4);
4607                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4608                                                 err_at += pad_needed;
4609                                         }
4610                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4611                                         s.param_length = htons(sizeof(s) + plen);
4612                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4613                                         err_at += sizeof(s);
4614                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4615                                         if (phdr == NULL) {
4616                                                 sctp_m_freem(op_err);
4617                                                 /*
4618                                                  * we are out of memory but
4619                                                  * we still need to have a
4620                                                  * look at what to do (the
4621                                                  * system is in trouble
4622                                                  * though).
4623                                                  */
4624                                                 return (NULL);
4625                                         }
4626                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4627                                         err_at += plen;
4628                                 }
4629                                 return (op_err);
4630                                 break;
4631                         }
4632                 default:
4633                         /*
4634                          * we do not recognize the parameter figure out what
4635                          * we do.
4636                          */
4637                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4638                         if ((ptype & 0x4000) == 0x4000) {
4639                                 /* Report bit is set?? */
4640                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4641                                 if (op_err == NULL) {
4642                                         int l_len;
4643
4644                                         /* Ok need to try to get an mbuf */
4645 #ifdef INET6
4646                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4647 #else
4648                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4649 #endif
4650                                         l_len += plen;
4651                                         l_len += sizeof(struct sctp_paramhdr);
4652                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4653                                         if (op_err) {
4654                                                 SCTP_BUF_LEN(op_err) = 0;
4655 #ifdef INET6
4656                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4657 #else
4658                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4659 #endif
4660                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4661                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4662                                         }
4663                                 }
4664                                 if (op_err) {
4665                                         /* If we have space */
4666                                         struct sctp_paramhdr s;
4667
4668                                         if (err_at % 4) {
4669                                                 uint32_t cpthis = 0;
4670
4671                                                 pad_needed = 4 - (err_at % 4);
4672                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4673                                                 err_at += pad_needed;
4674                                         }
4675                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4676                                         s.param_length = htons(sizeof(s) + plen);
4677                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4678                                         err_at += sizeof(s);
4679                                         if (plen > sizeof(tempbuf)) {
4680                                                 plen = sizeof(tempbuf);
4681                                         }
4682                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4683                                         if (phdr == NULL) {
4684                                                 sctp_m_freem(op_err);
4685                                                 /*
4686                                                  * we are out of memory but
4687                                                  * we still need to have a
4688                                                  * look at what to do (the
4689                                                  * system is in trouble
4690                                                  * though).
4691                                                  */
4692                                                 op_err = NULL;
4693                                                 goto more_processing;
4694                                         }
4695                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4696                                         err_at += plen;
4697                                 }
4698                         }
4699         more_processing:
4700                         if ((ptype & 0x8000) == 0x0000) {
4701                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4702                                 return (op_err);
4703                         } else {
4704                                 /* skip this chunk and continue processing */
4705                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4706                                 at += SCTP_SIZE32(plen);
4707                         }
4708                         break;
4709
4710                 }
4711                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4712         }
4713         return (op_err);
4714 invalid_size:
4715         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4716         *abort_processing = 1;
4717         if ((op_err == NULL) && phdr) {
4718                 int l_len;
4719
4720 #ifdef INET6
4721                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4722 #else
4723                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4724 #endif
4725                 l_len += (2 * sizeof(struct sctp_paramhdr));
4726                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4727                 if (op_err) {
4728                         SCTP_BUF_LEN(op_err) = 0;
4729 #ifdef INET6
4730                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4731 #else
4732                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4733 #endif
4734                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4735                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4736                 }
4737         }
4738         if ((op_err) && phdr) {
4739                 struct sctp_paramhdr s;
4740
4741                 if (err_at % 4) {
4742                         uint32_t cpthis = 0;
4743
4744                         pad_needed = 4 - (err_at % 4);
4745                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4746                         err_at += pad_needed;
4747                 }
4748                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4749                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4750                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4751                 err_at += sizeof(s);
4752                 /* Only copy back the p-hdr that caused the issue */
4753                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4754         }
4755         return (op_err);
4756 }
4757
4758 static int
4759 sctp_are_there_new_addresses(struct sctp_association *asoc,
4760     struct mbuf *in_initpkt, int iphlen, int offset)
4761 {
4762         /*
4763          * Given a INIT packet, look through the packet to verify that there
4764          * are NO new addresses. As we go through the parameters add reports
4765          * of any un-understood parameters that require an error.  Also we
4766          * must return (1) to drop the packet if we see a un-understood
4767          * parameter that tells us to drop the chunk.
4768          */
4769         struct sockaddr_in sin4, *sa4;
4770
4771 #ifdef INET6
4772         struct sockaddr_in6 sin6, *sa6;
4773
4774 #endif
4775         struct sockaddr *sa_touse;
4776         struct sockaddr *sa;
4777         struct sctp_paramhdr *phdr, params;
4778         struct ip *iph;
4779
4780 #ifdef INET6
4781         struct ip6_hdr *ip6h;
4782
4783 #endif
4784         struct mbuf *mat;
4785         uint16_t ptype, plen;
4786         int err_at;
4787         uint8_t fnd;
4788         struct sctp_nets *net;
4789
4790         memset(&sin4, 0, sizeof(sin4));
4791 #ifdef INET6
4792         memset(&sin6, 0, sizeof(sin6));
4793 #endif
4794         sin4.sin_family = AF_INET;
4795         sin4.sin_len = sizeof(sin4);
4796 #ifdef INET6
4797         sin6.sin6_family = AF_INET6;
4798         sin6.sin6_len = sizeof(sin6);
4799 #endif
4800         sa_touse = NULL;
4801         /* First what about the src address of the pkt ? */
4802         iph = mtod(in_initpkt, struct ip *);
4803         switch (iph->ip_v) {
4804         case IPVERSION:
4805                 /* source addr is IPv4 */
4806                 sin4.sin_addr = iph->ip_src;
4807                 sa_touse = (struct sockaddr *)&sin4;
4808                 break;
4809 #ifdef INET6
4810         case IPV6_VERSION >> 4:
4811                 /* source addr is IPv6 */
4812                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4813                 sin6.sin6_addr = ip6h->ip6_src;
4814                 sa_touse = (struct sockaddr *)&sin6;
4815                 break;
4816 #endif
4817         default:
4818                 return (1);
4819         }
4820
4821         fnd = 0;
4822         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4823                 sa = (struct sockaddr *)&net->ro._l_addr;
4824                 if (sa->sa_family == sa_touse->sa_family) {
4825                         if (sa->sa_family == AF_INET) {
4826                                 sa4 = (struct sockaddr_in *)sa;
4827                                 if (sa4->sin_addr.s_addr ==
4828                                     sin4.sin_addr.s_addr) {
4829                                         fnd = 1;
4830                                         break;
4831                                 }
4832                         }
4833 #ifdef INET6
4834                         if (sa->sa_family == AF_INET6) {
4835                                 sa6 = (struct sockaddr_in6 *)sa;
4836                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4837                                     &sin6)) {
4838                                         fnd = 1;
4839                                         break;
4840                                 }
4841                         }
4842 #endif
4843                 }
4844         }
4845         if (fnd == 0) {
4846                 /* New address added! no need to look futher. */
4847                 return (1);
4848         }
4849         /* Ok so far lets munge through the rest of the packet */
4850         mat = in_initpkt;
4851         err_at = 0;
4852         sa_touse = NULL;
4853         offset += sizeof(struct sctp_init_chunk);
4854         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4855         while (phdr) {
4856                 ptype = ntohs(phdr->param_type);
4857                 plen = ntohs(phdr->param_length);
4858                 if (ptype == SCTP_IPV4_ADDRESS) {
4859                         struct sctp_ipv4addr_param *p4, p4_buf;
4860
4861                         phdr = sctp_get_next_param(mat, offset,
4862                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4863                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4864                             phdr == NULL) {
4865                                 return (1);
4866                         }
4867                         p4 = (struct sctp_ipv4addr_param *)phdr;
4868                         sin4.sin_addr.s_addr = p4->addr;
4869                         sa_touse = (struct sockaddr *)&sin4;
4870                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4871                         struct sctp_ipv6addr_param *p6, p6_buf;
4872
4873                         phdr = sctp_get_next_param(mat, offset,
4874                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4875                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4876                             phdr == NULL) {
4877                                 return (1);
4878                         }
4879                         p6 = (struct sctp_ipv6addr_param *)phdr;
4880 #ifdef INET6
4881                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4882                             sizeof(p6->addr));
4883 #endif
4884                         sa_touse = (struct sockaddr *)&sin4;
4885                 }
4886                 if (sa_touse) {
4887                         /* ok, sa_touse points to one to check */
4888                         fnd = 0;
4889                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4890                                 sa = (struct sockaddr *)&net->ro._l_addr;
4891                                 if (sa->sa_family != sa_touse->sa_family) {
4892                                         continue;
4893                                 }
4894                                 if (sa->sa_family == AF_INET) {
4895                                         sa4 = (struct sockaddr_in *)sa;
4896                                         if (sa4->sin_addr.s_addr ==
4897                                             sin4.sin_addr.s_addr) {
4898                                                 fnd = 1;
4899                                                 break;
4900                                         }
4901                                 }
4902 #ifdef INET6
4903                                 if (sa->sa_family == AF_INET6) {
4904                                         sa6 = (struct sockaddr_in6 *)sa;
4905                                         if (SCTP6_ARE_ADDR_EQUAL(
4906                                             sa6, &sin6)) {
4907                                                 fnd = 1;
4908                                                 break;
4909                                         }
4910                                 }
4911 #endif
4912                         }
4913                         if (!fnd) {
4914                                 /* New addr added! no need to look further */
4915                                 return (1);
4916                         }
4917                 }
4918                 offset += SCTP_SIZE32(plen);
4919                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4920         }
4921         return (0);
4922 }
4923
4924 /*
4925  * Given a MBUF chain that was sent into us containing an INIT. Build a
4926  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4927  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4928  * message (i.e. the struct sctp_init_msg).
4929  */
4930 void
4931 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4932     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4933     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4934 {
4935         struct sctp_association *asoc;
4936         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4937         struct sctp_init_ack_chunk *initack;
4938         struct sctp_adaptation_layer_indication *ali;
4939         struct sctp_ecn_supported_param *ecn;
4940         struct sctp_prsctp_supported_param *prsctp;
4941         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4942         struct sctp_supported_chunk_types_param *pr_supported;
4943         union sctp_sockstore store, store1, *over_addr;
4944         struct sockaddr_in *sin, *to_sin;
4945
4946 #ifdef INET6
4947         struct sockaddr_in6 *sin6, *to_sin6;
4948
4949 #endif
4950         struct ip *iph;
4951
4952 #ifdef INET6
4953         struct ip6_hdr *ip6;
4954
4955 #endif
4956         struct sockaddr *to;
4957         struct sctp_state_cookie stc;
4958         struct sctp_nets *net = NULL;
4959         uint8_t *signature = NULL;
4960         int cnt_inits_to = 0;
4961         uint16_t his_limit, i_want;
4962         int abort_flag, padval;
4963         int num_ext;
4964         int p_len;
4965         int nat_friendly = 0;
4966         struct socket *so;
4967
4968         if (stcb)
4969                 asoc = &stcb->asoc;
4970         else
4971                 asoc = NULL;
4972         mp_last = NULL;
4973         if ((asoc != NULL) &&
4974             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4975             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4976                 /* new addresses, out of here in non-cookie-wait states */
4977                 /*
4978                  * Send a ABORT, we don't add the new address error clause
4979                  * though we even set the T bit and copy in the 0 tag.. this
4980                  * looks no different than if no listener was present.
4981                  */
4982                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4983                 return;
4984         }
4985         abort_flag = 0;
4986         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4987             (offset + sizeof(struct sctp_init_chunk)),
4988             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4989         if (abort_flag) {
4990 do_a_abort:
4991                 sctp_send_abort(init_pkt, iphlen, sh,
4992                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4993                 return;
4994         }
4995         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4996         if (m == NULL) {
4997                 /* No memory, INIT timer will re-attempt. */
4998                 if (op_err)
4999                         sctp_m_freem(op_err);
5000                 return;
5001         }
5002         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5003
5004         /* the time I built cookie */
5005         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5006
5007         /* populate any tie tags */
5008         if (asoc != NULL) {
5009                 /* unlock before tag selections */
5010                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5011                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5012                 stc.cookie_life = asoc->cookie_life;
5013                 net = asoc->primary_destination;
5014         } else {
5015                 stc.tie_tag_my_vtag = 0;
5016                 stc.tie_tag_peer_vtag = 0;
5017                 /* life I will award this cookie */
5018                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5019         }
5020
5021         /* copy in the ports for later check */
5022         stc.myport = sh->dest_port;
5023         stc.peerport = sh->src_port;
5024
5025         /*
5026          * If we wanted to honor cookie life extentions, we would add to
5027          * stc.cookie_life. For now we should NOT honor any extension
5028          */
5029         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5030         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5031                 struct inpcb *in_inp;
5032
5033                 /* Its a V6 socket */
5034                 in_inp = (struct inpcb *)inp;
5035                 stc.ipv6_addr_legal = 1;
5036                 /* Now look at the binding flag to see if V4 will be legal */
5037                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5038                         stc.ipv4_addr_legal = 1;
5039                 } else {
5040                         /* V4 addresses are NOT legal on the association */
5041                         stc.ipv4_addr_legal = 0;
5042                 }
5043         } else {
5044                 /* Its a V4 socket, no - V6 */
5045                 stc.ipv4_addr_legal = 1;
5046                 stc.ipv6_addr_legal = 0;
5047         }
5048
5049 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5050         stc.ipv4_scope = 1;
5051 #else
5052         stc.ipv4_scope = 0;
5053 #endif
5054         /* now for scope setup */
5055         memset((caddr_t)&store, 0, sizeof(store));
5056         memset((caddr_t)&store1, 0, sizeof(store1));
5057         sin = &store.sin;
5058         to_sin = &store1.sin;
5059 #ifdef INET6
5060         sin6 = &store.sin6;
5061         to_sin6 = &store1.sin6;
5062 #endif
5063         iph = mtod(init_pkt, struct ip *);
5064         /* establish the to_addr's */
5065         switch (iph->ip_v) {
5066         case IPVERSION:
5067                 to_sin->sin_port = sh->dest_port;
5068                 to_sin->sin_family = AF_INET;
5069                 to_sin->sin_len = sizeof(struct sockaddr_in);
5070                 to_sin->sin_addr = iph->ip_dst;
5071                 break;
5072 #ifdef INET6
5073         case IPV6_VERSION >> 4:
5074                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5075                 to_sin6->sin6_addr = ip6->ip6_dst;
5076                 to_sin6->sin6_scope_id = 0;
5077                 to_sin6->sin6_port = sh->dest_port;
5078                 to_sin6->sin6_family = AF_INET6;
5079                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5080                 break;
5081 #endif
5082         default:
5083                 goto do_a_abort;
5084                 break;
5085         };
5086
5087         if (net == NULL) {
5088                 to = (struct sockaddr *)&store;
5089                 switch (iph->ip_v) {
5090                 case IPVERSION:
5091                         {
5092                                 sin->sin_family = AF_INET;
5093                                 sin->sin_len = sizeof(struct sockaddr_in);
5094                                 sin->sin_port = sh->src_port;
5095                                 sin->sin_addr = iph->ip_src;
5096                                 /* lookup address */
5097                                 stc.address[0] = sin->sin_addr.s_addr;
5098                                 stc.address[1] = 0;
5099                                 stc.address[2] = 0;
5100                                 stc.address[3] = 0;
5101                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5102                                 /* local from address */
5103                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5104                                 stc.laddress[1] = 0;
5105                                 stc.laddress[2] = 0;
5106                                 stc.laddress[3] = 0;
5107                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5108                                 /* scope_id is only for v6 */
5109                                 stc.scope_id = 0;
5110 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5111                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5112                                         stc.ipv4_scope = 1;
5113                                 }
5114 #else
5115                                 stc.ipv4_scope = 1;
5116 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5117                                 /* Must use the address in this case */
5118                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5119                                         stc.loopback_scope = 1;
5120                                         stc.ipv4_scope = 1;
5121                                         stc.site_scope = 1;
5122                                         stc.local_scope = 0;
5123                                 }
5124                                 break;
5125                         }
5126 #ifdef INET6
5127                 case IPV6_VERSION >> 4:
5128                         {
5129                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5130                                 sin6->sin6_family = AF_INET6;
5131                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5132                                 sin6->sin6_port = sh->src_port;
5133                                 sin6->sin6_addr = ip6->ip6_src;
5134                                 /* lookup address */
5135                                 memcpy(&stc.address, &sin6->sin6_addr,
5136                                     sizeof(struct in6_addr));
5137                                 sin6->sin6_scope_id = 0;
5138                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5139                                 stc.scope_id = 0;
5140                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5141                                         /*
5142                                          * FIX ME: does this have scope from
5143                                          * rcvif?
5144                                          */
5145                                         (void)sa6_recoverscope(sin6);
5146                                         stc.scope_id = sin6->sin6_scope_id;
5147                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5148                                         stc.loopback_scope = 1;
5149                                         stc.local_scope = 0;
5150                                         stc.site_scope = 1;
5151                                         stc.ipv4_scope = 1;
5152                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5153                                         /*
5154                                          * If the new destination is a
5155                                          * LINK_LOCAL we must have common
5156                                          * both site and local scope. Don't
5157                                          * set local scope though since we
5158                                          * must depend on the source to be
5159                                          * added implicitly. We cannot
5160                                          * assure just because we share one
5161                                          * link that all links are common.
5162                                          */
5163                                         stc.local_scope = 0;
5164                                         stc.site_scope = 1;
5165                                         stc.ipv4_scope = 1;
5166                                         /*
5167                                          * we start counting for the private
5168                                          * address stuff at 1. since the
5169                                          * link local we source from won't
5170                                          * show up in our scoped count.
5171                                          */
5172                                         cnt_inits_to = 1;
5173                                         /*
5174                                          * pull out the scope_id from
5175                                          * incoming pkt
5176                                          */
5177                                         /*
5178                                          * FIX ME: does this have scope from
5179                                          * rcvif?
5180                                          */
5181                                         (void)sa6_recoverscope(sin6);
5182                                         stc.scope_id = sin6->sin6_scope_id;
5183                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5184                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5185                                         /*
5186                                          * If the new destination is
5187                                          * SITE_LOCAL then we must have site
5188                                          * scope in common.
5189                                          */
5190                                         stc.site_scope = 1;
5191                                 }
5192                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5193                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5194                                 break;
5195                         }
5196 #endif
5197                 default:
5198                         /* TSNH */
5199                         goto do_a_abort;
5200                         break;
5201                 }
5202         } else {
5203                 /* set the scope per the existing tcb */
5204
5205 #ifdef INET6
5206                 struct sctp_nets *lnet;
5207
5208 #endif
5209
5210                 stc.loopback_scope = asoc->loopback_scope;
5211                 stc.ipv4_scope = asoc->ipv4_local_scope;
5212                 stc.site_scope = asoc->site_scope;
5213                 stc.local_scope = asoc->local_scope;
5214 #ifdef INET6
5215                 /* Why do we not consider IPv4 LL addresses? */
5216                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5217                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5218                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5219                                         /*
5220                                          * if we have a LL address, start
5221                                          * counting at 1.
5222                                          */
5223                                         cnt_inits_to = 1;
5224                                 }
5225                         }
5226                 }
5227 #endif
5228                 /* use the net pointer */
5229                 to = (struct sockaddr *)&net->ro._l_addr;
5230                 switch (to->sa_family) {
5231                 case AF_INET:
5232                         sin = (struct sockaddr_in *)to;
5233                         stc.address[0] = sin->sin_addr.s_addr;
5234                         stc.address[1] = 0;
5235                         stc.address[2] = 0;
5236                         stc.address[3] = 0;
5237                         stc.addr_type = SCTP_IPV4_ADDRESS;
5238                         if (net->src_addr_selected == 0) {
5239                                 /*
5240                                  * strange case here, the INIT should have
5241                                  * did the selection.
5242                                  */
5243                                 net->ro._s_addr = sctp_source_address_selection(inp,
5244                                     stcb, (sctp_route_t *) & net->ro,
5245                                     net, 0, vrf_id);
5246                                 if (net->ro._s_addr == NULL)
5247                                         return;
5248
5249                                 net->src_addr_selected = 1;
5250
5251                         }
5252                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5253                         stc.laddress[1] = 0;
5254                         stc.laddress[2] = 0;
5255                         stc.laddress[3] = 0;
5256                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5257                         break;
5258 #ifdef INET6
5259                 case AF_INET6:
5260                         sin6 = (struct sockaddr_in6 *)to;
5261                         memcpy(&stc.address, &sin6->sin6_addr,
5262                             sizeof(struct in6_addr));
5263                         stc.addr_type = SCTP_IPV6_ADDRESS;
5264                         if (net->src_addr_selected == 0) {
5265                                 /*
5266                                  * strange case here, the INIT should have
5267                                  * did the selection.
5268                                  */
5269                                 net->ro._s_addr = sctp_source_address_selection(inp,
5270                                     stcb, (sctp_route_t *) & net->ro,
5271                                     net, 0, vrf_id);
5272                                 if (net->ro._s_addr == NULL)
5273                                         return;
5274
5275                                 net->src_addr_selected = 1;
5276                         }
5277                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5278                             sizeof(struct in6_addr));
5279                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5280                         break;
5281 #endif
5282                 }
5283         }
5284         /* Now lets put the SCTP header in place */
5285         initack = mtod(m, struct sctp_init_ack_chunk *);
5286         /* Save it off for quick ref */
5287         stc.peers_vtag = init_chk->init.initiate_tag;
5288         /* who are we */
5289         memcpy(stc.identification, SCTP_VERSION_STRING,
5290             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5291         /* now the chunk header */
5292         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5293         initack->ch.chunk_flags = 0;
5294         /* fill in later from mbuf we build */
5295         initack->ch.chunk_length = 0;
5296         /* place in my tag */
5297         if ((asoc != NULL) &&
5298             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5299             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5300             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5301                 /* re-use the v-tags and init-seq here */
5302                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5303                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5304         } else {
5305                 uint32_t vtag, itsn;
5306
5307                 if (hold_inp_lock) {
5308                         SCTP_INP_INCR_REF(inp);
5309                         SCTP_INP_RUNLOCK(inp);
5310                 }
5311                 if (asoc) {
5312                         atomic_add_int(&asoc->refcnt, 1);
5313                         SCTP_TCB_UNLOCK(stcb);
5314         new_tag:
5315                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5316                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5317                                 /*
5318                                  * Got a duplicate vtag on some guy behind a
5319                                  * nat make sure we don't use it.
5320                                  */
5321                                 goto new_tag;
5322                         }
5323                         initack->init.initiate_tag = htonl(vtag);
5324                         /* get a TSN to use too */
5325                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5326                         initack->init.initial_tsn = htonl(itsn);
5327                         SCTP_TCB_LOCK(stcb);
5328                         atomic_add_int(&asoc->refcnt, -1);
5329                 } else {
5330                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5331                         initack->init.initiate_tag = htonl(vtag);
5332                         /* get a TSN to use too */
5333                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5334                 }
5335                 if (hold_inp_lock) {
5336                         SCTP_INP_RLOCK(inp);
5337                         SCTP_INP_DECR_REF(inp);
5338                 }
5339         }
5340         /* save away my tag to */
5341         stc.my_vtag = initack->init.initiate_tag;
5342
5343         /* set up some of the credits. */
5344         so = inp->sctp_socket;
5345         if (so == NULL) {
5346                 /* memory problem */
5347                 sctp_m_freem(m);
5348                 return;
5349         } else {
5350                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5351         }
5352         /* set what I want */
5353         his_limit = ntohs(init_chk->init.num_inbound_streams);
5354         /* choose what I want */
5355         if (asoc != NULL) {
5356                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5357                         i_want = asoc->streamoutcnt;
5358                 } else {
5359                         i_want = inp->sctp_ep.pre_open_stream_count;
5360                 }
5361         } else {
5362                 i_want = inp->sctp_ep.pre_open_stream_count;
5363         }
5364         if (his_limit < i_want) {
5365                 /* I Want more :< */
5366                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5367         } else {
5368                 /* I can have what I want :> */
5369                 initack->init.num_outbound_streams = htons(i_want);
5370         }
5371         /* tell him his limt. */
5372         initack->init.num_inbound_streams =
5373             htons(inp->sctp_ep.max_open_streams_intome);
5374
5375         /* adaptation layer indication parameter */
5376         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5377         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5378         ali->ph.param_length = htons(sizeof(*ali));
5379         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5380         SCTP_BUF_LEN(m) += sizeof(*ali);
5381         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5382
5383         /* ECN parameter */
5384         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5385                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5386                 ecn->ph.param_length = htons(sizeof(*ecn));
5387                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5388
5389                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5390                     sizeof(*ecn));
5391         } else {
5392                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5393         }
5394         /* And now tell the peer we do  pr-sctp */
5395         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5396         prsctp->ph.param_length = htons(sizeof(*prsctp));
5397         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5398         if (nat_friendly) {
5399                 /* Add NAT friendly parameter */
5400                 struct sctp_paramhdr *ph;
5401
5402                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5403                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5404                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5405                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5406         }
5407         /* And now tell the peer we do all the extensions */
5408         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5409         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5410         num_ext = 0;
5411         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5412         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5413         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5414         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5415         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5416         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5417                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5418         /*
5419          * EY  if the sysctl variable is set, tell the assoc. initiator that
5420          * we do nr_sack
5421          */
5422         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5423                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5424         p_len = sizeof(*pr_supported) + num_ext;
5425         pr_supported->ph.param_length = htons(p_len);
5426         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5427         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5428
5429         /* ECN nonce: And now tell the peer we support ECN nonce */
5430         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5431                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5432                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5433                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5434                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5435                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5436         }
5437         /* add authentication parameters */
5438         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5439                 struct sctp_auth_random *randp;
5440                 struct sctp_auth_hmac_algo *hmacs;
5441                 struct sctp_auth_chunk_list *chunks;
5442                 uint16_t random_len;
5443
5444                 /* generate and add RANDOM parameter */
5445                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5446                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5447                 randp->ph.param_type = htons(SCTP_RANDOM);
5448                 p_len = sizeof(*randp) + random_len;
5449                 randp->ph.param_length = htons(p_len);
5450                 SCTP_READ_RANDOM(randp->random_data, random_len);
5451                 /* zero out any padding required */
5452                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5453                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5454
5455                 /* add HMAC_ALGO parameter */
5456                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5457                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5458                     (uint8_t *) hmacs->hmac_ids);
5459                 if (p_len > 0) {
5460                         p_len += sizeof(*hmacs);
5461                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5462                         hmacs->ph.param_length = htons(p_len);
5463                         /* zero out any padding required */
5464                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5465                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5466                 }
5467                 /* add CHUNKS parameter */
5468                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5469                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5470                     chunks->chunk_types);
5471                 if (p_len > 0) {
5472                         p_len += sizeof(*chunks);
5473                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5474                         chunks->ph.param_length = htons(p_len);
5475                         /* zero out any padding required */
5476                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5477                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5478                 }
5479         }
5480         m_at = m;
5481         /* now the addresses */
5482         {
5483                 struct sctp_scoping scp;
5484
5485                 /*
5486                  * To optimize this we could put the scoping stuff into a
5487                  * structure and remove the individual uint8's from the stc
5488                  * structure. Then we could just sifa in the address within
5489                  * the stc.. but for now this is a quick hack to get the
5490                  * address stuff teased apart.
5491                  */
5492                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5493                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5494                 scp.loopback_scope = stc.loopback_scope;
5495                 scp.ipv4_local_scope = stc.ipv4_scope;
5496                 scp.local_scope = stc.local_scope;
5497                 scp.site_scope = stc.site_scope;
5498                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5499         }
5500
5501         /* tack on the operational error if present */
5502         if (op_err) {
5503                 struct mbuf *ol;
5504                 int llen;
5505
5506                 llen = 0;
5507                 ol = op_err;
5508                 while (ol) {
5509                         llen += SCTP_BUF_LEN(ol);
5510                         ol = SCTP_BUF_NEXT(ol);
5511                 }
5512                 if (llen % 4) {
5513                         /* must add a pad to the param */
5514                         uint32_t cpthis = 0;
5515                         int padlen;
5516
5517                         padlen = 4 - (llen % 4);
5518                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5519                 }
5520                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5521                         m_at = SCTP_BUF_NEXT(m_at);
5522                 }
5523                 SCTP_BUF_NEXT(m_at) = op_err;
5524                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5525                         m_at = SCTP_BUF_NEXT(m_at);
5526                 }
5527         }
5528         /* pre-calulate the size and update pkt header and chunk header */
5529         p_len = 0;
5530         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5531                 p_len += SCTP_BUF_LEN(m_tmp);
5532                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5533                         /* m_tmp should now point to last one */
5534                         break;
5535                 }
5536         }
5537
5538         /* Now we must build a cookie */
5539         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5540         if (m_cookie == NULL) {
5541                 /* memory problem */
5542                 sctp_m_freem(m);
5543                 return;
5544         }
5545         /* Now append the cookie to the end and update the space/size */
5546         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5547
5548         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5549                 p_len += SCTP_BUF_LEN(m_tmp);
5550                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5551                         /* m_tmp should now point to last one */
5552                         mp_last = m_tmp;
5553                         break;
5554                 }
5555         }
5556         /*
5557          * Place in the size, but we don't include the last pad (if any) in
5558          * the INIT-ACK.
5559          */
5560         initack->ch.chunk_length = htons(p_len);
5561
5562         /*
5563          * Time to sign the cookie, we don't sign over the cookie signature
5564          * though thus we set trailer.
5565          */
5566         (void)sctp_hmac_m(SCTP_HMAC,
5567             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5568             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5569             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5570         /*
5571          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5572          * here since the timer will drive a retranmission.
5573          */
5574         padval = p_len % 4;
5575         if ((padval) && (mp_last)) {
5576                 /* see my previous comments on mp_last */
5577                 int ret;
5578
5579                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5580                 if (ret) {
5581                         /* Houston we have a problem, no space */
5582                         sctp_m_freem(m);
5583                         return;
5584                 }
5585                 p_len += padval;
5586         }
5587         if (stc.loopback_scope) {
5588                 over_addr = &store1;
5589         } else {
5590                 over_addr = NULL;
5591         }
5592
5593         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5594             0, NULL, 0,
5595             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5596             port, SCTP_SO_NOT_LOCKED, over_addr);
5597         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5598 }
5599
5600
5601 void
5602 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5603     struct sctp_association *asoc,
5604     struct sctp_stream_out *strq, int holds_lock)
5605 {
5606         struct sctp_stream_out *stre, *strn;
5607
5608         if (holds_lock == 0) {
5609                 SCTP_TCB_SEND_LOCK(stcb);
5610         }
5611         if ((strq->next_spoke.tqe_next) ||
5612             (strq->next_spoke.tqe_prev)) {
5613                 /* already on wheel */
5614                 goto outof_here;
5615         }
5616         stre = TAILQ_FIRST(&asoc->out_wheel);
5617         if (stre == NULL) {
5618                 /* only one on wheel */
5619                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5620                 goto outof_here;
5621         }
5622         for (; stre; stre = strn) {
5623                 strn = TAILQ_NEXT(stre, next_spoke);
5624                 if (stre->stream_no > strq->stream_no) {
5625                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5626                         goto outof_here;
5627                 } else if (stre->stream_no == strq->stream_no) {
5628                         /* huh, should not happen */
5629                         goto outof_here;
5630                 } else if (strn == NULL) {
5631                         /* next one is null */
5632                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5633                             next_spoke);
5634                 }
5635         }
5636 outof_here:
5637         if (holds_lock == 0) {
5638                 SCTP_TCB_SEND_UNLOCK(stcb);
5639         }
5640 }
5641
5642 void
5643 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5644     struct sctp_association *asoc,
5645     struct sctp_stream_out *strq,
5646     int holds_lock)
5647 {
5648         /* take off and then setup so we know it is not on the wheel */
5649         if (holds_lock == 0)
5650                 SCTP_TCB_SEND_LOCK(stcb);
5651         if (TAILQ_FIRST(&strq->outqueue)) {
5652                 /* more was added */
5653                 if (holds_lock == 0)
5654                         SCTP_TCB_SEND_UNLOCK(stcb);
5655                 return;
5656         }
5657         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5658         strq->next_spoke.tqe_next = NULL;
5659         strq->next_spoke.tqe_prev = NULL;
5660         if (holds_lock == 0)
5661                 SCTP_TCB_SEND_UNLOCK(stcb);
5662 }
5663
5664 static void
5665 sctp_prune_prsctp(struct sctp_tcb *stcb,
5666     struct sctp_association *asoc,
5667     struct sctp_sndrcvinfo *srcv,
5668     int dataout)
5669 {
5670         int freed_spc = 0;
5671         struct sctp_tmit_chunk *chk, *nchk;
5672
5673         SCTP_TCB_LOCK_ASSERT(stcb);
5674         if ((asoc->peer_supports_prsctp) &&
5675             (asoc->sent_queue_cnt_removeable > 0)) {
5676                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5677                         /*
5678                          * Look for chunks marked with the PR_SCTP flag AND
5679                          * the buffer space flag. If the one being sent is
5680                          * equal or greater priority then purge the old one
5681                          * and free some space.
5682                          */
5683                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5684                                 /*
5685                                  * This one is PR-SCTP AND buffer space
5686                                  * limited type
5687                                  */
5688                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5689                                         /*
5690                                          * Lower numbers equates to higher
5691                                          * priority so if the one we are
5692                                          * looking at has a larger or equal
5693                                          * priority we want to drop the data
5694                                          * and NOT retransmit it.
5695                                          */
5696                                         if (chk->data) {
5697                                                 /*
5698                                                  * We release the book_size
5699                                                  * if the mbuf is here
5700                                                  */
5701                                                 int ret_spc;
5702                                                 int cause;
5703
5704                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5705                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5706                                                 else
5707                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5708                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5709                                                     cause,
5710                                                     SCTP_SO_LOCKED);
5711                                                 freed_spc += ret_spc;
5712                                                 if (freed_spc >= dataout) {
5713                                                         return;
5714                                                 }
5715                                         }       /* if chunk was present */
5716                                 }       /* if of sufficent priority */
5717                         }       /* if chunk has enabled */
5718                 }               /* tailqforeach */
5719
5720                 chk = TAILQ_FIRST(&asoc->send_queue);
5721                 while (chk) {
5722                         nchk = TAILQ_NEXT(chk, sctp_next);
5723                         /* Here we must move to the sent queue and mark */
5724                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5725                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5726                                         if (chk->data) {
5727                                                 /*
5728                                                  * We release the book_size
5729                                                  * if the mbuf is here
5730                                                  */
5731                                                 int ret_spc;
5732
5733                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5734                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5735                                                     SCTP_SO_LOCKED);
5736
5737                                                 freed_spc += ret_spc;
5738                                                 if (freed_spc >= dataout) {
5739                                                         return;
5740                                                 }
5741                                         }       /* end if chk->data */
5742                                 }       /* end if right class */
5743                         }       /* end if chk pr-sctp */
5744                         chk = nchk;
5745                 }               /* end while (chk) */
5746         }                       /* if enabled in asoc */
5747 }
5748
5749 int
5750 sctp_get_frag_point(struct sctp_tcb *stcb,
5751     struct sctp_association *asoc)
5752 {
5753         int siz, ovh;
5754
5755         /*
5756          * For endpoints that have both v6 and v4 addresses we must reserve
5757          * room for the ipv6 header, for those that are only dealing with V4
5758          * we use a larger frag point.
5759          */
5760         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5761                 ovh = SCTP_MED_OVERHEAD;
5762         } else {
5763                 ovh = SCTP_MED_V4_OVERHEAD;
5764         }
5765
5766         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5767                 siz = asoc->smallest_mtu - ovh;
5768         else
5769                 siz = (stcb->asoc.sctp_frag_point - ovh);
5770         /*
5771          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5772          */
5773         /* A data chunk MUST fit in a cluster */
5774         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5775         /* } */
5776
5777         /* adjust for an AUTH chunk if DATA requires auth */
5778         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5779                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5780
5781         if (siz % 4) {
5782                 /* make it an even word boundary please */
5783                 siz -= (siz % 4);
5784         }
5785         return (siz);
5786 }
5787
5788 static void
5789 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
5790     struct sctp_stream_queue_pending *sp)
5791 {
5792         sp->pr_sctp_on = 0;
5793         if (stcb->asoc.peer_supports_prsctp) {
5794                 /*
5795                  * We assume that the user wants PR_SCTP_TTL if the user
5796                  * provides a positive lifetime but does not specify any
5797                  * PR_SCTP policy. This is a BAD assumption and causes
5798                  * problems at least with the U-Vancovers MPI folks. I will
5799                  * change this to be no policy means NO PR-SCTP.
5800                  */
5801                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5802                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5803                         sp->pr_sctp_on = 1;
5804                 } else {
5805                         return;
5806                 }
5807                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5808                 case CHUNK_FLAGS_PR_SCTP_BUF:
5809                         /*
5810                          * Time to live is a priority stored in tv_sec when
5811                          * doing the buffer drop thing.
5812                          */
5813                         sp->ts.tv_sec = sp->timetolive;
5814                         sp->ts.tv_usec = 0;
5815                         break;
5816                 case CHUNK_FLAGS_PR_SCTP_TTL:
5817                         {
5818                                 struct timeval tv;
5819
5820                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5821                                 tv.tv_sec = sp->timetolive / 1000;
5822                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5823                                 /*
5824                                  * TODO sctp_constants.h needs alternative
5825                                  * time macros when _KERNEL is undefined.
5826                                  */
5827                                 timevaladd(&sp->ts, &tv);
5828                         }
5829                         break;
5830                 case CHUNK_FLAGS_PR_SCTP_RTX:
5831                         /*
5832                          * Time to live is a the number or retransmissions
5833                          * stored in tv_sec.
5834                          */
5835                         sp->ts.tv_sec = sp->timetolive;
5836                         sp->ts.tv_usec = 0;
5837                         break;
5838                 default:
5839                         SCTPDBG(SCTP_DEBUG_USRREQ1,
5840                             "Unknown PR_SCTP policy %u.\n",
5841                             PR_SCTP_POLICY(sp->sinfo_flags));
5842                         break;
5843                 }
5844         }
5845 }
5846
5847 static int
5848 sctp_msg_append(struct sctp_tcb *stcb,
5849     struct sctp_nets *net,
5850     struct mbuf *m,
5851     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5852 {
5853         int error = 0, holds_lock;
5854         struct mbuf *at;
5855         struct sctp_stream_queue_pending *sp = NULL;
5856         struct sctp_stream_out *strm;
5857
5858         /*
5859          * Given an mbuf chain, put it into the association send queue and
5860          * place it on the wheel
5861          */
5862         holds_lock = hold_stcb_lock;
5863         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5864                 /* Invalid stream number */
5865                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5866                 error = EINVAL;
5867                 goto out_now;
5868         }
5869         if ((stcb->asoc.stream_locked) &&
5870             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5871                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5872                 error = EINVAL;
5873                 goto out_now;
5874         }
5875         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5876         /* Now can we send this? */
5877         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5878             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5879             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5880             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5881                 /* got data while shutting down */
5882                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5883                 error = ECONNRESET;
5884                 goto out_now;
5885         }
5886         sctp_alloc_a_strmoq(stcb, sp);
5887         if (sp == NULL) {
5888                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5889                 error = ENOMEM;
5890                 goto out_now;
5891         }
5892         sp->sinfo_flags = srcv->sinfo_flags;
5893         sp->timetolive = srcv->sinfo_timetolive;
5894         sp->ppid = srcv->sinfo_ppid;
5895         sp->context = srcv->sinfo_context;
5896         sp->strseq = 0;
5897         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5898                 sp->net = net;
5899                 sp->addr_over = 1;
5900         } else {
5901                 sp->net = stcb->asoc.primary_destination;
5902                 sp->addr_over = 0;
5903         }
5904         atomic_add_int(&sp->net->ref_count, 1);
5905         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5906         sp->stream = srcv->sinfo_stream;
5907         sp->msg_is_complete = 1;
5908         sp->sender_all_done = 1;
5909         sp->some_taken = 0;
5910         sp->data = m;
5911         sp->tail_mbuf = NULL;
5912         sp->length = 0;
5913         at = m;
5914         sctp_set_prsctp_policy(stcb, sp);
5915         /*
5916          * We could in theory (for sendall) sifa the length in, but we would
5917          * still have to hunt through the chain since we need to setup the
5918          * tail_mbuf
5919          */
5920         while (at) {
5921                 if (SCTP_BUF_NEXT(at) == NULL)
5922                         sp->tail_mbuf = at;
5923                 sp->length += SCTP_BUF_LEN(at);
5924                 at = SCTP_BUF_NEXT(at);
5925         }
5926         SCTP_TCB_SEND_LOCK(stcb);
5927         sctp_snd_sb_alloc(stcb, sp->length);
5928         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5929         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5930         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5931                 sp->strseq = strm->next_sequence_sent;
5932                 strm->next_sequence_sent++;
5933         }
5934         if ((strm->next_spoke.tqe_next == NULL) &&
5935             (strm->next_spoke.tqe_prev == NULL)) {
5936                 /* Not on wheel, insert */
5937                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5938         }
5939         m = NULL;
5940         SCTP_TCB_SEND_UNLOCK(stcb);
5941 out_now:
5942         if (m) {
5943                 sctp_m_freem(m);
5944         }
5945         return (error);
5946 }
5947
5948
5949 static struct mbuf *
5950 sctp_copy_mbufchain(struct mbuf *clonechain,
5951     struct mbuf *outchain,
5952     struct mbuf **endofchain,
5953     int can_take_mbuf,
5954     int sizeofcpy,
5955     uint8_t copy_by_ref)
5956 {
5957         struct mbuf *m;
5958         struct mbuf *appendchain;
5959         caddr_t cp;
5960         int len;
5961
5962         if (endofchain == NULL) {
5963                 /* error */
5964 error_out:
5965                 if (outchain)
5966                         sctp_m_freem(outchain);
5967                 return (NULL);
5968         }
5969         if (can_take_mbuf) {
5970                 appendchain = clonechain;
5971         } else {
5972                 if (!copy_by_ref &&
5973                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5974                     ) {
5975                         /* Its not in a cluster */
5976                         if (*endofchain == NULL) {
5977                                 /* lets get a mbuf cluster */
5978                                 if (outchain == NULL) {
5979                                         /* This is the general case */
5980                         new_mbuf:
5981                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5982                                         if (outchain == NULL) {
5983                                                 goto error_out;
5984                                         }
5985                                         SCTP_BUF_LEN(outchain) = 0;
5986                                         *endofchain = outchain;
5987                                         /* get the prepend space */
5988                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5989                                 } else {
5990                                         /*
5991                                          * We really should not get a NULL
5992                                          * in endofchain
5993                                          */
5994                                         /* find end */
5995                                         m = outchain;
5996                                         while (m) {
5997                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5998                                                         *endofchain = m;
5999                                                         break;
6000                                                 }
6001                                                 m = SCTP_BUF_NEXT(m);
6002                                         }
6003                                         /* sanity */
6004                                         if (*endofchain == NULL) {
6005                                                 /*
6006                                                  * huh, TSNH XXX maybe we
6007                                                  * should panic
6008                                                  */
6009                                                 sctp_m_freem(outchain);
6010                                                 goto new_mbuf;
6011                                         }
6012                                 }
6013                                 /* get the new end of length */
6014                                 len = M_TRAILINGSPACE(*endofchain);
6015                         } else {
6016                                 /* how much is left at the end? */
6017                                 len = M_TRAILINGSPACE(*endofchain);
6018                         }
6019                         /* Find the end of the data, for appending */
6020                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6021
6022                         /* Now lets copy it out */
6023                         if (len >= sizeofcpy) {
6024                                 /* It all fits, copy it in */
6025                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6026                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6027                         } else {
6028                                 /* fill up the end of the chain */
6029                                 if (len > 0) {
6030                                         m_copydata(clonechain, 0, len, cp);
6031                                         SCTP_BUF_LEN((*endofchain)) += len;
6032                                         /* now we need another one */
6033                                         sizeofcpy -= len;
6034                                 }
6035                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6036                                 if (m == NULL) {
6037                                         /* We failed */
6038                                         goto error_out;
6039                                 }
6040                                 SCTP_BUF_NEXT((*endofchain)) = m;
6041                                 *endofchain = m;
6042                                 cp = mtod((*endofchain), caddr_t);
6043                                 m_copydata(clonechain, len, sizeofcpy, cp);
6044                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6045                         }
6046                         return (outchain);
6047                 } else {
6048                         /* copy the old fashion way */
6049                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6050 #ifdef SCTP_MBUF_LOGGING
6051                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6052                                 struct mbuf *mat;
6053
6054                                 mat = appendchain;
6055                                 while (mat) {
6056                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6057                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6058                                         }
6059                                         mat = SCTP_BUF_NEXT(mat);
6060                                 }
6061                         }
6062 #endif
6063                 }
6064         }
6065         if (appendchain == NULL) {
6066                 /* error */
6067                 if (outchain)
6068                         sctp_m_freem(outchain);
6069                 return (NULL);
6070         }
6071         if (outchain) {
6072                 /* tack on to the end */
6073                 if (*endofchain != NULL) {
6074                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6075                 } else {
6076                         m = outchain;
6077                         while (m) {
6078                                 if (SCTP_BUF_NEXT(m) == NULL) {
6079                                         SCTP_BUF_NEXT(m) = appendchain;
6080                                         break;
6081                                 }
6082                                 m = SCTP_BUF_NEXT(m);
6083                         }
6084                 }
6085                 /*
6086                  * save off the end and update the end-chain postion
6087                  */
6088                 m = appendchain;
6089                 while (m) {
6090                         if (SCTP_BUF_NEXT(m) == NULL) {
6091                                 *endofchain = m;
6092                                 break;
6093                         }
6094                         m = SCTP_BUF_NEXT(m);
6095                 }
6096                 return (outchain);
6097         } else {
6098                 /* save off the end and update the end-chain postion */
6099                 m = appendchain;
6100                 while (m) {
6101                         if (SCTP_BUF_NEXT(m) == NULL) {
6102                                 *endofchain = m;
6103                                 break;
6104                         }
6105                         m = SCTP_BUF_NEXT(m);
6106                 }
6107                 return (appendchain);
6108         }
6109 }
6110
6111 int
6112 sctp_med_chunk_output(struct sctp_inpcb *inp,
6113     struct sctp_tcb *stcb,
6114     struct sctp_association *asoc,
6115     int *num_out,
6116     int *reason_code,
6117     int control_only, int from_where,
6118     struct timeval *now, int *now_filled, int frag_point, int so_locked
6119 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6120     SCTP_UNUSED
6121 #endif
6122 );
6123
6124 static void
6125 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6126     uint32_t val)
6127 {
6128         struct sctp_copy_all *ca;
6129         struct mbuf *m;
6130         int ret = 0;
6131         int added_control = 0;
6132         int un_sent, do_chunk_output = 1;
6133         struct sctp_association *asoc;
6134
6135         ca = (struct sctp_copy_all *)ptr;
6136         if (ca->m == NULL) {
6137                 return;
6138         }
6139         if (ca->inp != inp) {
6140                 /* TSNH */
6141                 return;
6142         }
6143         if ((ca->m) && ca->sndlen) {
6144                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6145                 if (m == NULL) {
6146                         /* can't copy so we are done */
6147                         ca->cnt_failed++;
6148                         return;
6149                 }
6150 #ifdef SCTP_MBUF_LOGGING
6151                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6152                         struct mbuf *mat;
6153
6154                         mat = m;
6155                         while (mat) {
6156                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6157                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6158                                 }
6159                                 mat = SCTP_BUF_NEXT(mat);
6160                         }
6161                 }
6162 #endif
6163         } else {
6164                 m = NULL;
6165         }
6166         SCTP_TCB_LOCK_ASSERT(stcb);
6167         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6168                 /* Abort this assoc with m as the user defined reason */
6169                 if (m) {
6170                         struct sctp_paramhdr *ph;
6171
6172                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6173                         if (m) {
6174                                 ph = mtod(m, struct sctp_paramhdr *);
6175                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6176                                 ph->param_length = htons(ca->sndlen);
6177                         }
6178                         /*
6179                          * We add one here to keep the assoc from
6180                          * dis-appearing on us.
6181                          */
6182                         atomic_add_int(&stcb->asoc.refcnt, 1);
6183                         sctp_abort_an_association(inp, stcb,
6184                             SCTP_RESPONSE_TO_USER_REQ,
6185                             m, SCTP_SO_NOT_LOCKED);
6186                         /*
6187                          * sctp_abort_an_association calls sctp_free_asoc()
6188                          * free association will NOT free it since we
6189                          * incremented the refcnt .. we do this to prevent
6190                          * it being freed and things getting tricky since we
6191                          * could end up (from free_asoc) calling inpcb_free
6192                          * which would get a recursive lock call to the
6193                          * iterator lock.. But as a consequence of that the
6194                          * stcb will return to us un-locked.. since
6195                          * free_asoc returns with either no TCB or the TCB
6196                          * unlocked, we must relock.. to unlock in the
6197                          * iterator timer :-0
6198                          */
6199                         SCTP_TCB_LOCK(stcb);
6200                         atomic_add_int(&stcb->asoc.refcnt, -1);
6201                         goto no_chunk_output;
6202                 }
6203         } else {
6204                 if (m) {
6205                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6206                             &ca->sndrcv, 1);
6207                 }
6208                 asoc = &stcb->asoc;
6209                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6210                         /* shutdown this assoc */
6211                         int cnt;
6212
6213                         cnt = sctp_is_there_unsent_data(stcb);
6214
6215                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6216                             TAILQ_EMPTY(&asoc->sent_queue) &&
6217                             (cnt == 0)) {
6218                                 if (asoc->locked_on_sending) {
6219                                         goto abort_anyway;
6220                                 }
6221                                 /*
6222                                  * there is nothing queued to send, so I'm
6223                                  * done...
6224                                  */
6225                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6226                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6227                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6228                                         /*
6229                                          * only send SHUTDOWN the first time
6230                                          * through
6231                                          */
6232                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6233                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6234                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6235                                         }
6236                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6237                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6238                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6239                                             asoc->primary_destination);
6240                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6241                                             asoc->primary_destination);
6242                                         added_control = 1;
6243                                         do_chunk_output = 0;
6244                                 }
6245                         } else {
6246                                 /*
6247                                  * we still got (or just got) data to send,
6248                                  * so set SHUTDOWN_PENDING
6249                                  */
6250                                 /*
6251                                  * XXX sockets draft says that SCTP_EOF
6252                                  * should be sent with no data.  currently,
6253                                  * we will allow user data to be sent first
6254                                  * and move to SHUTDOWN-PENDING
6255                                  */
6256                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6257                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6258                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6259                                         if (asoc->locked_on_sending) {
6260                                                 /*
6261                                                  * Locked to send out the
6262                                                  * data
6263                                                  */
6264                                                 struct sctp_stream_queue_pending *sp;
6265
6266                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6267                                                 if (sp) {
6268                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6269                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6270                                                 }
6271                                         }
6272                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6273                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6274                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6275                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6276                                 abort_anyway:
6277                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6278                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6279                                                     SCTP_RESPONSE_TO_USER_REQ,
6280                                                     NULL, SCTP_SO_NOT_LOCKED);
6281                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6282                                                 goto no_chunk_output;
6283                                         }
6284                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6285                                             asoc->primary_destination);
6286                                 }
6287                         }
6288
6289                 }
6290         }
6291         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6292             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6293
6294         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6295             (stcb->asoc.total_flight > 0) &&
6296             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6297             ) {
6298                 do_chunk_output = 0;
6299         }
6300         if (do_chunk_output)
6301                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6302         else if (added_control) {
6303                 int num_out = 0, reason = 0, now_filled = 0;
6304                 struct timeval now;
6305                 int frag_point;
6306
6307                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6308                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6309                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6310         }
6311 no_chunk_output:
6312         if (ret) {
6313                 ca->cnt_failed++;
6314         } else {
6315                 ca->cnt_sent++;
6316         }
6317 }
6318
6319 static void
6320 sctp_sendall_completes(void *ptr, uint32_t val)
6321 {
6322         struct sctp_copy_all *ca;
6323
6324         ca = (struct sctp_copy_all *)ptr;
6325         /*
6326          * Do a notify here? Kacheong suggests that the notify be done at
6327          * the send time.. so you would push up a notification if any send
6328          * failed. Don't know if this is feasable since the only failures we
6329          * have is "memory" related and if you cannot get an mbuf to send
6330          * the data you surely can't get an mbuf to send up to notify the
6331          * user you can't send the data :->
6332          */
6333
6334         /* now free everything */
6335         sctp_m_freem(ca->m);
6336         SCTP_FREE(ca, SCTP_M_COPYAL);
6337 }
6338
6339
6340 #define MC_ALIGN(m, len) do {                                           \
6341         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6342 } while (0)
6343
6344
6345
6346 static struct mbuf *
6347 sctp_copy_out_all(struct uio *uio, int len)
6348 {
6349         struct mbuf *ret, *at;
6350         int left, willcpy, cancpy, error;
6351
6352         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6353         if (ret == NULL) {
6354                 /* TSNH */
6355                 return (NULL);
6356         }
6357         left = len;
6358         SCTP_BUF_LEN(ret) = 0;
6359         /* save space for the data chunk header */
6360         cancpy = M_TRAILINGSPACE(ret);
6361         willcpy = min(cancpy, left);
6362         at = ret;
6363         while (left > 0) {
6364                 /* Align data to the end */
6365                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6366                 if (error) {
6367         err_out_now:
6368                         sctp_m_freem(at);
6369                         return (NULL);
6370                 }
6371                 SCTP_BUF_LEN(at) = willcpy;
6372                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6373                 left -= willcpy;
6374                 if (left > 0) {
6375                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6376                         if (SCTP_BUF_NEXT(at) == NULL) {
6377                                 goto err_out_now;
6378                         }
6379                         at = SCTP_BUF_NEXT(at);
6380                         SCTP_BUF_LEN(at) = 0;
6381                         cancpy = M_TRAILINGSPACE(at);
6382                         willcpy = min(cancpy, left);
6383                 }
6384         }
6385         return (ret);
6386 }
6387
6388 static int
6389 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6390     struct sctp_sndrcvinfo *srcv)
6391 {
6392         int ret;
6393         struct sctp_copy_all *ca;
6394
6395         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6396             SCTP_M_COPYAL);
6397         if (ca == NULL) {
6398                 sctp_m_freem(m);
6399                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6400                 return (ENOMEM);
6401         }
6402         memset(ca, 0, sizeof(struct sctp_copy_all));
6403
6404         ca->inp = inp;
6405         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6406         /*
6407          * take off the sendall flag, it would be bad if we failed to do
6408          * this :-0
6409          */
6410         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6411         /* get length and mbuf chain */
6412         if (uio) {
6413                 ca->sndlen = uio->uio_resid;
6414                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6415                 if (ca->m == NULL) {
6416                         SCTP_FREE(ca, SCTP_M_COPYAL);
6417                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6418                         return (ENOMEM);
6419                 }
6420         } else {
6421                 /* Gather the length of the send */
6422                 struct mbuf *mat;
6423
6424                 mat = m;
6425                 ca->sndlen = 0;
6426                 while (m) {
6427                         ca->sndlen += SCTP_BUF_LEN(m);
6428                         m = SCTP_BUF_NEXT(m);
6429                 }
6430                 ca->m = mat;
6431         }
6432         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6433             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6434             SCTP_ASOC_ANY_STATE,
6435             (void *)ca, 0,
6436             sctp_sendall_completes, inp, 1);
6437         if (ret) {
6438                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6439                 SCTP_FREE(ca, SCTP_M_COPYAL);
6440                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6441                 return (EFAULT);
6442         }
6443         return (0);
6444 }
6445
6446
6447 void
6448 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6449 {
6450         struct sctp_tmit_chunk *chk, *nchk;
6451
6452         chk = TAILQ_FIRST(&asoc->control_send_queue);
6453         while (chk) {
6454                 nchk = TAILQ_NEXT(chk, sctp_next);
6455                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6456                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6457                         if (chk->data) {
6458                                 sctp_m_freem(chk->data);
6459                                 chk->data = NULL;
6460                         }
6461                         asoc->ctrl_queue_cnt--;
6462                         sctp_free_a_chunk(stcb, chk);
6463                 }
6464                 chk = nchk;
6465         }
6466 }
6467
6468 void
6469 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6470 {
6471         struct sctp_association *asoc;
6472         struct sctp_tmit_chunk *chk, *chk_tmp;
6473         struct sctp_asconf_chunk *acp;
6474
6475         asoc = &stcb->asoc;
6476         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6477             chk = chk_tmp) {
6478                 /* get next chk */
6479                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6480                 /* find SCTP_ASCONF chunk in queue */
6481                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6482                         if (chk->data) {
6483                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6484                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6485                                         /* Not Acked yet */
6486                                         break;
6487                                 }
6488                         }
6489                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6490                         if (chk->data) {
6491                                 sctp_m_freem(chk->data);
6492                                 chk->data = NULL;
6493                         }
6494                         asoc->ctrl_queue_cnt--;
6495                         sctp_free_a_chunk(stcb, chk);
6496                 }
6497         }
6498 }
6499
6500
6501 static void
6502 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6503
6504     struct sctp_association *asoc,
6505     struct sctp_tmit_chunk **data_list,
6506     int bundle_at,
6507     struct sctp_nets *net)
6508 {
6509         int i;
6510         struct sctp_tmit_chunk *tp1;
6511
6512         for (i = 0; i < bundle_at; i++) {
6513                 /* off of the send queue */
6514                 if (i) {
6515                         /*
6516                          * Any chunk NOT 0 you zap the time chunk 0 gets
6517                          * zapped or set based on if a RTO measurment is
6518                          * needed.
6519                          */
6520                         data_list[i]->do_rtt = 0;
6521                 }
6522                 /* record time */
6523                 data_list[i]->sent_rcv_time = net->last_sent_time;
6524                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6525                 TAILQ_REMOVE(&asoc->send_queue,
6526                     data_list[i],
6527                     sctp_next);
6528                 /* on to the sent queue */
6529                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6530                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6531                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6532                         struct sctp_tmit_chunk *tpp;
6533
6534                         /* need to move back */
6535         back_up_more:
6536                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6537                         if (tpp == NULL) {
6538                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6539                                 goto all_done;
6540                         }
6541                         tp1 = tpp;
6542                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6543                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6544                                 goto back_up_more;
6545                         }
6546                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6547                 } else {
6548                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6549                             data_list[i],
6550                             sctp_next);
6551                 }
6552 all_done:
6553                 /* This does not lower until the cum-ack passes it */
6554                 asoc->sent_queue_cnt++;
6555                 asoc->send_queue_cnt--;
6556                 if ((asoc->peers_rwnd <= 0) &&
6557                     (asoc->total_flight == 0) &&
6558                     (bundle_at == 1)) {
6559                         /* Mark the chunk as being a window probe */
6560                         SCTP_STAT_INCR(sctps_windowprobed);
6561                 }
6562 #ifdef SCTP_AUDITING_ENABLED
6563                 sctp_audit_log(0xC2, 3);
6564 #endif
6565                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6566                 data_list[i]->snd_count = 1;
6567                 data_list[i]->rec.data.chunk_was_revoked = 0;
6568                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6569                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6570                             data_list[i]->whoTo->flight_size,
6571                             data_list[i]->book_size,
6572                             (uintptr_t) data_list[i]->whoTo,
6573                             data_list[i]->rec.data.TSN_seq);
6574                 }
6575                 sctp_flight_size_increase(data_list[i]);
6576                 sctp_total_flight_increase(stcb, data_list[i]);
6577                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6578                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6579                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6580                 }
6581                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6582                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6583                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6584                         /* SWS sender side engages */
6585                         asoc->peers_rwnd = 0;
6586                 }
6587         }
6588 }
6589
6590 static void
6591 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6592 {
6593         struct sctp_tmit_chunk *chk, *nchk;
6594
6595         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6596             chk; chk = nchk) {
6597                 nchk = TAILQ_NEXT(chk, sctp_next);
6598                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6599                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6600                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6601                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6602                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6603                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6604                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6605                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6606                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6607                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6608                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6609                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6610                         /* Stray chunks must be cleaned up */
6611         clean_up_anyway:
6612                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6613                         if (chk->data) {
6614                                 sctp_m_freem(chk->data);
6615                                 chk->data = NULL;
6616                         }
6617                         asoc->ctrl_queue_cnt--;
6618                         sctp_free_a_chunk(stcb, chk);
6619                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6620                         /* special handling, we must look into the param */
6621                         if (chk != asoc->str_reset) {
6622                                 goto clean_up_anyway;
6623                         }
6624                 }
6625         }
6626 }
6627
6628
6629 static int
6630 sctp_can_we_split_this(struct sctp_tcb *stcb,
6631     uint32_t length,
6632     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6633 {
6634         /*
6635          * Make a decision on if I should split a msg into multiple parts.
6636          * This is only asked of incomplete messages.
6637          */
6638         if (eeor_on) {
6639                 /*
6640                  * If we are doing EEOR we need to always send it if its the
6641                  * entire thing, since it might be all the guy is putting in
6642                  * the hopper.
6643                  */
6644                 if (goal_mtu >= length) {
6645                         /*-
6646                          * If we have data outstanding,
6647                          * we get another chance when the sack
6648                          * arrives to transmit - wait for more data
6649                          */
6650                         if (stcb->asoc.total_flight == 0) {
6651                                 /*
6652                                  * If nothing is in flight, we zero the
6653                                  * packet counter.
6654                                  */
6655                                 return (length);
6656                         }
6657                         return (0);
6658
6659                 } else {
6660                         /* You can fill the rest */
6661                         return (goal_mtu);
6662                 }
6663         }
6664         /*-
6665          * For those strange folk that make the send buffer
6666          * smaller than our fragmentation point, we can't
6667          * get a full msg in so we have to allow splitting.
6668          */
6669         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6670                 return (length);
6671         }
6672         if ((length <= goal_mtu) ||
6673             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6674                 /* Sub-optimial residual don't split in non-eeor mode. */
6675                 return (0);
6676         }
6677         /*
6678          * If we reach here length is larger than the goal_mtu. Do we wish
6679          * to split it for the sake of packet putting together?
6680          */
6681         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6682                 /* Its ok to split it */
6683                 return (min(goal_mtu, frag_point));
6684         }
6685         /* Nope, can't split */
6686         return (0);
6687
6688 }
6689
6690 static uint32_t
6691 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6692     struct sctp_stream_out *strq,
6693     uint32_t goal_mtu,
6694     uint32_t frag_point,
6695     int *locked,
6696     int *giveup,
6697     int eeor_mode,
6698     int *bail)
6699 {
6700         /* Move from the stream to the send_queue keeping track of the total */
6701         struct sctp_association *asoc;
6702         struct sctp_stream_queue_pending *sp;
6703         struct sctp_tmit_chunk *chk;
6704         struct sctp_data_chunk *dchkh;
6705         uint32_t to_move, length;
6706         uint8_t rcv_flags = 0;
6707         uint8_t some_taken;
6708         uint8_t send_lock_up = 0;
6709
6710         SCTP_TCB_LOCK_ASSERT(stcb);
6711         asoc = &stcb->asoc;
6712 one_more_time:
6713         /* sa_ignore FREED_MEMORY */
6714         sp = TAILQ_FIRST(&strq->outqueue);
6715         if (sp == NULL) {
6716                 *locked = 0;
6717                 if (send_lock_up == 0) {
6718                         SCTP_TCB_SEND_LOCK(stcb);
6719                         send_lock_up = 1;
6720                 }
6721                 sp = TAILQ_FIRST(&strq->outqueue);
6722                 if (sp) {
6723                         goto one_more_time;
6724                 }
6725                 if (strq->last_msg_incomplete) {
6726                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6727                             strq->stream_no,
6728                             strq->last_msg_incomplete);
6729                         strq->last_msg_incomplete = 0;
6730                 }
6731                 to_move = 0;
6732                 if (send_lock_up) {
6733                         SCTP_TCB_SEND_UNLOCK(stcb);
6734                         send_lock_up = 0;
6735                 }
6736                 goto out_of;
6737         }
6738         if ((sp->msg_is_complete) && (sp->length == 0)) {
6739                 if (sp->sender_all_done) {
6740                         /*
6741                          * We are doing differed cleanup. Last time through
6742                          * when we took all the data the sender_all_done was
6743                          * not set.
6744                          */
6745                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6746                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6747                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6748                                     sp->sender_all_done,
6749                                     sp->length,
6750                                     sp->msg_is_complete,
6751                                     sp->put_last_out,
6752                                     send_lock_up);
6753                         }
6754                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6755                                 SCTP_TCB_SEND_LOCK(stcb);
6756                                 send_lock_up = 1;
6757                         }
6758                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6759                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6760                         sctp_free_remote_addr(sp->net);
6761                         if (sp->data) {
6762                                 sctp_m_freem(sp->data);
6763                                 sp->data = NULL;
6764                         }
6765                         sctp_free_a_strmoq(stcb, sp);
6766                         /* we can't be locked to it */
6767                         *locked = 0;
6768                         stcb->asoc.locked_on_sending = NULL;
6769                         if (send_lock_up) {
6770                                 SCTP_TCB_SEND_UNLOCK(stcb);
6771                                 send_lock_up = 0;
6772                         }
6773                         /* back to get the next msg */
6774                         goto one_more_time;
6775                 } else {
6776                         /*
6777                          * sender just finished this but still holds a
6778                          * reference
6779                          */
6780                         *locked = 1;
6781                         *giveup = 1;
6782                         to_move = 0;
6783                         goto out_of;
6784                 }
6785         } else {
6786                 /* is there some to get */
6787                 if (sp->length == 0) {
6788                         /* no */
6789                         *locked = 1;
6790                         *giveup = 1;
6791                         to_move = 0;
6792                         goto out_of;
6793                 } else if (sp->discard_rest) {
6794                         if (send_lock_up == 0) {
6795                                 SCTP_TCB_SEND_LOCK(stcb);
6796                                 send_lock_up = 1;
6797                         }
6798                         /* Whack down the size */
6799                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6800                         if ((stcb->sctp_socket != NULL) && \
6801                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6802                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6803                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6804                         }
6805                         if (sp->data) {
6806                                 sctp_m_freem(sp->data);
6807                                 sp->data = NULL;
6808                                 sp->tail_mbuf = NULL;
6809                         }
6810                         sp->length = 0;
6811                         sp->some_taken = 1;
6812                         *locked = 1;
6813                         *giveup = 1;
6814                         to_move = 0;
6815                         goto out_of;
6816                 }
6817         }
6818         some_taken = sp->some_taken;
6819         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6820                 sp->msg_is_complete = 1;
6821         }
6822 re_look:
6823         length = sp->length;
6824         if (sp->msg_is_complete) {
6825                 /* The message is complete */
6826                 to_move = min(length, frag_point);
6827                 if (to_move == length) {
6828                         /* All of it fits in the MTU */
6829                         if (sp->some_taken) {
6830                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6831                                 sp->put_last_out = 1;
6832                         } else {
6833                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6834                                 sp->put_last_out = 1;
6835                         }
6836                 } else {
6837                         /* Not all of it fits, we fragment */
6838                         if (sp->some_taken == 0) {
6839                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6840                         }
6841                         sp->some_taken = 1;
6842                 }
6843         } else {
6844                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6845                 if (to_move) {
6846                         /*-
6847                          * We use a snapshot of length in case it
6848                          * is expanding during the compare.
6849                          */
6850                         uint32_t llen;
6851
6852                         llen = length;
6853                         if (to_move >= llen) {
6854                                 to_move = llen;
6855                                 if (send_lock_up == 0) {
6856                                         /*-
6857                                          * We are taking all of an incomplete msg
6858                                          * thus we need a send lock.
6859                                          */
6860                                         SCTP_TCB_SEND_LOCK(stcb);
6861                                         send_lock_up = 1;
6862                                         if (sp->msg_is_complete) {
6863                                                 /*
6864                                                  * the sender finished the
6865                                                  * msg
6866                                                  */
6867                                                 goto re_look;
6868                                         }
6869                                 }
6870                         }
6871                         if (sp->some_taken == 0) {
6872                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6873                                 sp->some_taken = 1;
6874                         }
6875                 } else {
6876                         /* Nothing to take. */
6877                         if (sp->some_taken) {
6878                                 *locked = 1;
6879                         }
6880                         *giveup = 1;
6881                         to_move = 0;
6882                         goto out_of;
6883                 }
6884         }
6885
6886         /* If we reach here, we can copy out a chunk */
6887         sctp_alloc_a_chunk(stcb, chk);
6888         if (chk == NULL) {
6889                 /* No chunk memory */
6890                 *giveup = 1;
6891                 to_move = 0;
6892                 goto out_of;
6893         }
6894         /*
6895          * Setup for unordered if needed by looking at the user sent info
6896          * flags.
6897          */
6898         if (sp->sinfo_flags & SCTP_UNORDERED) {
6899                 rcv_flags |= SCTP_DATA_UNORDERED;
6900         }
6901         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6902             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6903                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6904         }
6905         /* clear out the chunk before setting up */
6906         memset(chk, 0, sizeof(*chk));
6907         chk->rec.data.rcv_flags = rcv_flags;
6908
6909         if (to_move >= length) {
6910                 /* we think we can steal the whole thing */
6911                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6912                         SCTP_TCB_SEND_LOCK(stcb);
6913                         send_lock_up = 1;
6914                 }
6915                 if (to_move < sp->length) {
6916                         /* bail, it changed */
6917                         goto dont_do_it;
6918                 }
6919                 chk->data = sp->data;
6920                 chk->last_mbuf = sp->tail_mbuf;
6921                 /* register the stealing */
6922                 sp->data = sp->tail_mbuf = NULL;
6923         } else {
6924                 struct mbuf *m;
6925
6926 dont_do_it:
6927                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6928                 chk->last_mbuf = NULL;
6929                 if (chk->data == NULL) {
6930                         sp->some_taken = some_taken;
6931                         sctp_free_a_chunk(stcb, chk);
6932                         *bail = 1;
6933                         to_move = 0;
6934                         goto out_of;
6935                 }
6936 #ifdef SCTP_MBUF_LOGGING
6937                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6938                         struct mbuf *mat;
6939
6940                         mat = chk->data;
6941                         while (mat) {
6942                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6943                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6944                                 }
6945                                 mat = SCTP_BUF_NEXT(mat);
6946                         }
6947                 }
6948 #endif
6949                 /* Pull off the data */
6950                 m_adj(sp->data, to_move);
6951                 /* Now lets work our way down and compact it */
6952                 m = sp->data;
6953                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6954                         sp->data = SCTP_BUF_NEXT(m);
6955                         SCTP_BUF_NEXT(m) = NULL;
6956                         if (sp->tail_mbuf == m) {
6957                                 /*-
6958                                  * Freeing tail? TSNH since
6959                                  * we supposedly were taking less
6960                                  * than the sp->length.
6961                                  */
6962 #ifdef INVARIANTS
6963                                 panic("Huh, freing tail? - TSNH");
6964 #else
6965                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6966                                 sp->tail_mbuf = sp->data = NULL;
6967                                 sp->length = 0;
6968 #endif
6969
6970                         }
6971                         sctp_m_free(m);
6972                         m = sp->data;
6973                 }
6974         }
6975         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6976                 chk->copy_by_ref = 1;
6977         } else {
6978                 chk->copy_by_ref = 0;
6979         }
6980         /*
6981          * get last_mbuf and counts of mb useage This is ugly but hopefully
6982          * its only one mbuf.
6983          */
6984         if (chk->last_mbuf == NULL) {
6985                 chk->last_mbuf = chk->data;
6986                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6987                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6988                 }
6989         }
6990         if (to_move > length) {
6991                 /*- This should not happen either
6992                  * since we always lower to_move to the size
6993                  * of sp->length if its larger.
6994                  */
6995 #ifdef INVARIANTS
6996                 panic("Huh, how can to_move be larger?");
6997 #else
6998                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6999                 sp->length = 0;
7000 #endif
7001         } else {
7002                 atomic_subtract_int(&sp->length, to_move);
7003         }
7004         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7005                 /* Not enough room for a chunk header, get some */
7006                 struct mbuf *m;
7007
7008                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7009                 if (m == NULL) {
7010                         /*
7011                          * we're in trouble here. _PREPEND below will free
7012                          * all the data if there is no leading space, so we
7013                          * must put the data back and restore.
7014                          */
7015                         if (send_lock_up == 0) {
7016                                 SCTP_TCB_SEND_LOCK(stcb);
7017                                 send_lock_up = 1;
7018                         }
7019                         if (chk->data == NULL) {
7020                                 /* unsteal the data */
7021                                 sp->data = chk->data;
7022                                 sp->tail_mbuf = chk->last_mbuf;
7023                         } else {
7024                                 struct mbuf *m_tmp;
7025
7026                                 /* reassemble the data */
7027                                 m_tmp = sp->data;
7028                                 sp->data = chk->data;
7029                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7030                         }
7031                         sp->some_taken = some_taken;
7032                         atomic_add_int(&sp->length, to_move);
7033                         chk->data = NULL;
7034                         *bail = 1;
7035                         sctp_free_a_chunk(stcb, chk);
7036                         to_move = 0;
7037                         goto out_of;
7038                 } else {
7039                         SCTP_BUF_LEN(m) = 0;
7040                         SCTP_BUF_NEXT(m) = chk->data;
7041                         chk->data = m;
7042                         M_ALIGN(chk->data, 4);
7043                 }
7044         }
7045         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7046         if (chk->data == NULL) {
7047                 /* HELP, TSNH since we assured it would not above? */
7048 #ifdef INVARIANTS
7049                 panic("prepend failes HELP?");
7050 #else
7051                 SCTP_PRINTF("prepend fails HELP?\n");
7052                 sctp_free_a_chunk(stcb, chk);
7053 #endif
7054                 *bail = 1;
7055                 to_move = 0;
7056                 goto out_of;
7057         }
7058         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7059         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7060         chk->book_size_scale = 0;
7061         chk->sent = SCTP_DATAGRAM_UNSENT;
7062
7063         chk->flags = 0;
7064         chk->asoc = &stcb->asoc;
7065         chk->pad_inplace = 0;
7066         chk->no_fr_allowed = 0;
7067         chk->rec.data.stream_seq = sp->strseq;
7068         chk->rec.data.stream_number = sp->stream;
7069         chk->rec.data.payloadtype = sp->ppid;
7070         chk->rec.data.context = sp->context;
7071         chk->rec.data.doing_fast_retransmit = 0;
7072         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7073
7074         chk->rec.data.timetodrop = sp->ts;
7075         chk->flags = sp->act_flags;
7076         chk->addr_over = sp->addr_over;
7077
7078         chk->whoTo = net;
7079         atomic_add_int(&chk->whoTo->ref_count, 1);
7080
7081         if (sp->holds_key_ref) {
7082                 chk->auth_keyid = sp->auth_keyid;
7083                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7084                 chk->holds_key_ref = 1;
7085         }
7086         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7087         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7088                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7089                     (uintptr_t) stcb, sp->length,
7090                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7091                     chk->rec.data.TSN_seq);
7092         }
7093         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7094         /*
7095          * Put the rest of the things in place now. Size was done earlier in
7096          * previous loop prior to padding.
7097          */
7098
7099 #ifdef SCTP_ASOCLOG_OF_TSNS
7100         SCTP_TCB_LOCK_ASSERT(stcb);
7101         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7102                 asoc->tsn_out_at = 0;
7103                 asoc->tsn_out_wrapped = 1;
7104         }
7105         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7106         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7107         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7108         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7109         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7110         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7111         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7112         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7113         asoc->tsn_out_at++;
7114 #endif
7115
7116         dchkh->ch.chunk_type = SCTP_DATA;
7117         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7118         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7119         dchkh->dp.stream_id = htons(strq->stream_no);
7120         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7121         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7122         dchkh->ch.chunk_length = htons(chk->send_size);
7123         /* Now advance the chk->send_size by the actual pad needed. */
7124         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7125                 /* need a pad */
7126                 struct mbuf *lm;
7127                 int pads;
7128
7129                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7130                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7131                         chk->pad_inplace = 1;
7132                 }
7133                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7134                         /* pad added an mbuf */
7135                         chk->last_mbuf = lm;
7136                 }
7137                 chk->send_size += pads;
7138         }
7139         /* We only re-set the policy if it is on */
7140         if (sp->pr_sctp_on) {
7141                 sctp_set_prsctp_policy(stcb, sp);
7142                 asoc->pr_sctp_cnt++;
7143                 chk->pr_sctp_on = 1;
7144         } else {
7145                 chk->pr_sctp_on = 0;
7146         }
7147         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7148                 /* All done pull and kill the message */
7149                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7150                 if (sp->put_last_out == 0) {
7151                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7152                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7153                             sp->sender_all_done,
7154                             sp->length,
7155                             sp->msg_is_complete,
7156                             sp->put_last_out,
7157                             send_lock_up);
7158                 }
7159                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7160                         SCTP_TCB_SEND_LOCK(stcb);
7161                         send_lock_up = 1;
7162                 }
7163                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7164                 sctp_free_remote_addr(sp->net);
7165                 if (sp->data) {
7166                         sctp_m_freem(sp->data);
7167                         sp->data = NULL;
7168                 }
7169                 sctp_free_a_strmoq(stcb, sp);
7170
7171                 /* we can't be locked to it */
7172                 *locked = 0;
7173                 stcb->asoc.locked_on_sending = NULL;
7174         } else {
7175                 /* more to go, we are locked */
7176                 *locked = 1;
7177         }
7178         asoc->chunks_on_out_queue++;
7179         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7180         asoc->send_queue_cnt++;
7181 out_of:
7182         if (send_lock_up) {
7183                 SCTP_TCB_SEND_UNLOCK(stcb);
7184                 send_lock_up = 0;
7185         }
7186         return (to_move);
7187 }
7188
7189
7190 static struct sctp_stream_out *
7191 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7192 {
7193         struct sctp_stream_out *strq;
7194
7195         /* Find the next stream to use */
7196         if (asoc->last_out_stream == NULL) {
7197                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7198                 if (asoc->last_out_stream == NULL) {
7199                         /* huh nothing on the wheel, TSNH */
7200                         return (NULL);
7201                 }
7202                 goto done_it;
7203         }
7204         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7205 done_it:
7206         if (strq == NULL) {
7207                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7208         }
7209         /* Save off the last stream */
7210         asoc->last_out_stream = strq;
7211         return (strq);
7212
7213 }
7214
7215
7216 static void
7217 sctp_fill_outqueue(struct sctp_tcb *stcb,
7218     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7219 {
7220         struct sctp_association *asoc;
7221         struct sctp_stream_out *strq, *strqn, *strqt;
7222         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7223         int locked, giveup;
7224         struct sctp_stream_queue_pending *sp;
7225
7226         SCTP_TCB_LOCK_ASSERT(stcb);
7227         asoc = &stcb->asoc;
7228 #ifdef INET6
7229         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7230                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7231         } else {
7232                 /* ?? not sure what else to do */
7233                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7234         }
7235 #else
7236         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7237 #endif
7238         /* Need an allowance for the data chunk header too */
7239         goal_mtu -= sizeof(struct sctp_data_chunk);
7240
7241         /* must make even word boundary */
7242         goal_mtu &= 0xfffffffc;
7243         if (asoc->locked_on_sending) {
7244                 /* We are stuck on one stream until the message completes. */
7245                 strqn = strq = asoc->locked_on_sending;
7246                 locked = 1;
7247         } else {
7248                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7249                 locked = 0;
7250         }
7251
7252         while ((goal_mtu > 0) && strq) {
7253                 sp = TAILQ_FIRST(&strq->outqueue);
7254                 /*
7255                  * If CMT is off, we must validate that the stream in
7256                  * question has the first item pointed towards are network
7257                  * destionation requested by the caller. Note that if we
7258                  * turn out to be locked to a stream (assigning TSN's then
7259                  * we must stop, since we cannot look for another stream
7260                  * with data to send to that destination). In CMT's case, by
7261                  * skipping this check, we will send one data packet towards
7262                  * the requested net.
7263                  */
7264                 if (sp == NULL) {
7265                         break;
7266                 }
7267                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7268                         /* none for this network */
7269                         if (locked) {
7270                                 break;
7271                         } else {
7272                                 strq = sctp_select_a_stream(stcb, asoc);
7273                                 if (strq == NULL)
7274                                         /* none left */
7275                                         break;
7276                                 if (strqn == strq) {
7277                                         /* I have circled */
7278                                         break;
7279                                 }
7280                                 continue;
7281                         }
7282                 }
7283                 giveup = 0;
7284                 bail = 0;
7285                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7286                     &giveup, eeor_mode, &bail);
7287                 asoc->last_out_stream = strq;
7288                 if (locked) {
7289                         asoc->locked_on_sending = strq;
7290                         if ((moved_how_much == 0) || (giveup) || bail)
7291                                 /* no more to move for now */
7292                                 break;
7293                 } else {
7294                         asoc->locked_on_sending = NULL;
7295                         strqt = sctp_select_a_stream(stcb, asoc);
7296                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7297                                 if (strq == strqn) {
7298                                         /* Must move start to next one */
7299                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7300                                         if (strqn == NULL) {
7301                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7302                                                 if (strqn == NULL) {
7303                                                         break;
7304                                                 }
7305                                         }
7306                                 }
7307                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7308                         }
7309                         if ((giveup) || bail) {
7310                                 break;
7311                         }
7312                         strq = strqt;
7313                         if (strq == NULL) {
7314                                 break;
7315                         }
7316                 }
7317                 total_moved += moved_how_much;
7318                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7319                 goal_mtu &= 0xfffffffc;
7320         }
7321         if (bail)
7322                 *quit_now = 1;
7323
7324         if (total_moved == 0) {
7325                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7326                     (net == stcb->asoc.primary_destination)) {
7327                         /* ran dry for primary network net */
7328                         SCTP_STAT_INCR(sctps_primary_randry);
7329                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7330                         /* ran dry with CMT on */
7331                         SCTP_STAT_INCR(sctps_cmt_randry);
7332                 }
7333         }
7334 }
7335
7336 void
7337 sctp_fix_ecn_echo(struct sctp_association *asoc)
7338 {
7339         struct sctp_tmit_chunk *chk;
7340
7341         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7342                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7343                         chk->sent = SCTP_DATAGRAM_UNSENT;
7344                 }
7345         }
7346 }
7347
7348 static void
7349 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7350     struct sctp_association *asoc,
7351     struct sctp_nets *net)
7352 {
7353         struct sctp_tmit_chunk *chk;
7354         struct sctp_nets *a_net;
7355
7356         SCTP_TCB_LOCK_ASSERT(stcb);
7357         /*
7358          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7359          * destination using the PF algorithm for finding alternate
7360          * destinations.
7361          */
7362         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7363                 a_net = sctp_find_alternate_net(stcb, net, 2);
7364         } else {
7365                 a_net = sctp_find_alternate_net(stcb, net, 0);
7366         }
7367         if ((a_net != net) &&
7368             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7369                 /*
7370                  * We only proceed if a valid alternate is found that is not
7371                  * this one and is reachable. Here we must move all chunks
7372                  * queued in the send queue off of the destination address
7373                  * to our alternate.
7374                  */
7375                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7376                         if (chk->whoTo == net) {
7377                                 /* Move the chunk to our alternate */
7378                                 sctp_free_remote_addr(chk->whoTo);
7379                                 chk->whoTo = a_net;
7380                                 atomic_add_int(&a_net->ref_count, 1);
7381                         }
7382                 }
7383         }
7384 }
7385
7386 int
7387 sctp_med_chunk_output(struct sctp_inpcb *inp,
7388     struct sctp_tcb *stcb,
7389     struct sctp_association *asoc,
7390     int *num_out,
7391     int *reason_code,
7392     int control_only, int from_where,
7393     struct timeval *now, int *now_filled, int frag_point, int so_locked
7394 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7395     SCTP_UNUSED
7396 #endif
7397 )
7398 {
7399         /*
7400          * Ok this is the generic chunk service queue. we must do the
7401          * following: - Service the stream queue that is next, moving any
7402          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7403          * LAST to the out queue in one pass) and assigning TSN's - Check to
7404          * see if the cwnd/rwnd allows any output, if so we go ahead and
7405          * fomulate and send the low level chunks. Making sure to combine
7406          * any control in the control chunk queue also.
7407          */
7408         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7409         struct mbuf *outchain, *endoutchain;
7410         struct sctp_tmit_chunk *chk, *nchk;
7411
7412         /* temp arrays for unlinking */
7413         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7414         int no_fragmentflg, error;
7415         unsigned int max_rwnd_per_dest;
7416         int one_chunk, hbflag, skip_data_for_this_net;
7417         int asconf, cookie, no_out_cnt;
7418         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7419         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7420         int tsns_sent = 0;
7421         uint32_t auth_offset = 0;
7422         struct sctp_auth_chunk *auth = NULL;
7423         uint16_t auth_keyid;
7424         int override_ok = 1;
7425         int data_auth_reqd = 0;
7426
7427         /*
7428          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7429          * destination.
7430          */
7431         int pf_hbflag = 0;
7432         int quit_now = 0;
7433
7434         *num_out = 0;
7435         auth_keyid = stcb->asoc.authinfo.active_keyid;
7436
7437         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7438             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7439             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7440                 eeor_mode = 1;
7441         } else {
7442                 eeor_mode = 0;
7443         }
7444         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7445         /*
7446          * First lets prime the pump. For each destination, if there is room
7447          * in the flight size, attempt to pull an MTU's worth out of the
7448          * stream queues into the general send_queue
7449          */
7450 #ifdef SCTP_AUDITING_ENABLED
7451         sctp_audit_log(0xC2, 2);
7452 #endif
7453         SCTP_TCB_LOCK_ASSERT(stcb);
7454         hbflag = 0;
7455         if ((control_only) || (asoc->stream_reset_outstanding))
7456                 no_data_chunks = 1;
7457         else
7458                 no_data_chunks = 0;
7459
7460         /* Nothing to possible to send? */
7461         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7462             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7463             TAILQ_EMPTY(&asoc->send_queue) &&
7464             TAILQ_EMPTY(&asoc->out_wheel)) {
7465                 *reason_code = 9;
7466                 return (0);
7467         }
7468         if (asoc->peers_rwnd == 0) {
7469                 /* No room in peers rwnd */
7470                 *reason_code = 1;
7471                 if (asoc->total_flight > 0) {
7472                         /* we are allowed one chunk in flight */
7473                         no_data_chunks = 1;
7474                 }
7475         }
7476         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7477         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7478                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7479                         /*
7480                          * This for loop we are in takes in each net, if
7481                          * its's got space in cwnd and has data sent to it
7482                          * (when CMT is off) then it calls
7483                          * sctp_fill_outqueue for the net. This gets data on
7484                          * the send queue for that network.
7485                          *
7486                          * In sctp_fill_outqueue TSN's are assigned and data is
7487                          * copied out of the stream buffers. Note mostly
7488                          * copy by reference (we hope).
7489                          */
7490                         net->window_probe = 0;
7491                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7492                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7493                                         sctp_log_cwnd(stcb, net, 1,
7494                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7495                                 }
7496                                 continue;
7497                         }
7498                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7499                                 /* nothing can be in queue for this guy */
7500                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7501                                         sctp_log_cwnd(stcb, net, 2,
7502                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7503                                 }
7504                                 continue;
7505                         }
7506                         if (net->flight_size >= net->cwnd) {
7507                                 /* skip this network, no room - can't fill */
7508                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7509                                         sctp_log_cwnd(stcb, net, 3,
7510                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7511                                 }
7512                                 continue;
7513                         }
7514                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7515                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7516                         }
7517                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7518                         if (quit_now) {
7519                                 /* memory alloc failure */
7520                                 no_data_chunks = 1;
7521                                 break;
7522                         }
7523                 }
7524         }
7525         /* now service each destination and send out what we can for it */
7526         /* Nothing to send? */
7527         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7528             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7529             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7530                 *reason_code = 8;
7531                 return (0);
7532         }
7533         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7534                 /* get the last start point */
7535                 start_at = asoc->last_net_cmt_send_started;
7536                 if (start_at == NULL) {
7537                         /* null so to beginning */
7538                         start_at = TAILQ_FIRST(&asoc->nets);
7539                 } else {
7540                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7541                         if (start_at == NULL) {
7542                                 start_at = TAILQ_FIRST(&asoc->nets);
7543                         }
7544                 }
7545                 asoc->last_net_cmt_send_started = start_at;
7546         } else {
7547                 start_at = TAILQ_FIRST(&asoc->nets);
7548         }
7549         old_start_at = NULL;
7550 again_one_more_time:
7551         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7552                 /* how much can we send? */
7553                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7554                 if (old_start_at && (old_start_at == net)) {
7555                         /* through list ocmpletely. */
7556                         break;
7557                 }
7558                 tsns_sent = 0xa;
7559                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7560                         /*
7561                          * Ref-count of 1 so we cannot have data or control
7562                          * queued to this address. Skip it (non-CMT).
7563                          */
7564                         continue;
7565                 }
7566                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7567                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7568                     (net->flight_size >= net->cwnd)) {
7569                         /*
7570                          * Nothing on control or asconf and flight is full,
7571                          * we can skip even in the CMT case.
7572                          */
7573                         continue;
7574                 }
7575                 ctl_cnt = bundle_at = 0;
7576                 endoutchain = outchain = NULL;
7577                 no_fragmentflg = 1;
7578                 one_chunk = 0;
7579                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7580                         skip_data_for_this_net = 1;
7581                 } else {
7582                         skip_data_for_this_net = 0;
7583                 }
7584                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7585                         /*
7586                          * if we have a route and an ifp check to see if we
7587                          * have room to send to this guy
7588                          */
7589                         struct ifnet *ifp;
7590
7591                         ifp = net->ro.ro_rt->rt_ifp;
7592                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7593                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7594                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7595                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7596                                 }
7597                                 continue;
7598                         }
7599                 }
7600                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7601                 case AF_INET:
7602                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7603                         break;
7604 #ifdef INET6
7605                 case AF_INET6:
7606                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7607                         break;
7608 #endif
7609                 default:
7610                         /* TSNH */
7611                         mtu = net->mtu;
7612                         break;
7613                 }
7614                 mx_mtu = mtu;
7615                 to_out = 0;
7616                 if (mtu > asoc->peers_rwnd) {
7617                         if (asoc->total_flight > 0) {
7618                                 /* We have a packet in flight somewhere */
7619                                 r_mtu = asoc->peers_rwnd;
7620                         } else {
7621                                 /* We are always allowed to send one MTU out */
7622                                 one_chunk = 1;
7623                                 r_mtu = mtu;
7624                         }
7625                 } else {
7626                         r_mtu = mtu;
7627                 }
7628                 /************************/
7629                 /* ASCONF transmission */
7630                 /************************/
7631                 /* Now first lets go through the asconf queue */
7632                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7633                     chk; chk = nchk) {
7634                         nchk = TAILQ_NEXT(chk, sctp_next);
7635                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7636                                 continue;
7637                         }
7638                         if (chk->whoTo != net) {
7639                                 /*
7640                                  * No, not sent to the network we are
7641                                  * looking at
7642                                  */
7643                                 break;
7644                         }
7645                         if (chk->data == NULL) {
7646                                 break;
7647                         }
7648                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7649                             chk->sent != SCTP_DATAGRAM_RESEND) {
7650                                 break;
7651                         }
7652                         /*
7653                          * if no AUTH is yet included and this chunk
7654                          * requires it, make sure to account for it.  We
7655                          * don't apply the size until the AUTH chunk is
7656                          * actually added below in case there is no room for
7657                          * this chunk. NOTE: we overload the use of "omtu"
7658                          * here
7659                          */
7660                         if ((auth == NULL) &&
7661                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7662                             stcb->asoc.peer_auth_chunks)) {
7663                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7664                         } else
7665                                 omtu = 0;
7666                         /* Here we do NOT factor the r_mtu */
7667                         if ((chk->send_size < (int)(mtu - omtu)) ||
7668                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7669                                 /*
7670                                  * We probably should glom the mbuf chain
7671                                  * from the chk->data for control but the
7672                                  * problem is it becomes yet one more level
7673                                  * of tracking to do if for some reason
7674                                  * output fails. Then I have got to
7675                                  * reconstruct the merged control chain.. el
7676                                  * yucko.. for now we take the easy way and
7677                                  * do the copy
7678                                  */
7679                                 /*
7680                                  * Add an AUTH chunk, if chunk requires it
7681                                  * save the offset into the chain for AUTH
7682                                  */
7683                                 if ((auth == NULL) &&
7684                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7685                                     stcb->asoc.peer_auth_chunks))) {
7686                                         outchain = sctp_add_auth_chunk(outchain,
7687                                             &endoutchain,
7688                                             &auth,
7689                                             &auth_offset,
7690                                             stcb,
7691                                             chk->rec.chunk_id.id);
7692                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7693                                 }
7694                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7695                                     (int)chk->rec.chunk_id.can_take_data,
7696                                     chk->send_size, chk->copy_by_ref);
7697                                 if (outchain == NULL) {
7698                                         *reason_code = 8;
7699                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7700                                         return (ENOMEM);
7701                                 }
7702                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7703                                 /* update our MTU size */
7704                                 if (mtu > (chk->send_size + omtu))
7705                                         mtu -= (chk->send_size + omtu);
7706                                 else
7707                                         mtu = 0;
7708                                 to_out += (chk->send_size + omtu);
7709                                 /* Do clear IP_DF ? */
7710                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7711                                         no_fragmentflg = 0;
7712                                 }
7713                                 if (chk->rec.chunk_id.can_take_data)
7714                                         chk->data = NULL;
7715                                 /*
7716                                  * set hb flag since we can use these for
7717                                  * RTO
7718                                  */
7719                                 hbflag = 1;
7720                                 asconf = 1;
7721                                 /*
7722                                  * should sysctl this: don't bundle data
7723                                  * with ASCONF since it requires AUTH
7724                                  */
7725                                 no_data_chunks = 1;
7726                                 chk->sent = SCTP_DATAGRAM_SENT;
7727                                 chk->snd_count++;
7728                                 if (mtu == 0) {
7729                                         /*
7730                                          * Ok we are out of room but we can
7731                                          * output without effecting the
7732                                          * flight size since this little guy
7733                                          * is a control only packet.
7734                                          */
7735                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7736                                         /*
7737                                          * do NOT clear the asconf flag as
7738                                          * it is used to do appropriate
7739                                          * source address selection.
7740                                          */
7741                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7742                                             (struct sockaddr *)&net->ro._l_addr,
7743                                             outchain, auth_offset, auth,
7744                                             stcb->asoc.authinfo.active_keyid,
7745                                             no_fragmentflg, 0, NULL, asconf,
7746                                             inp->sctp_lport, stcb->rport,
7747                                             htonl(stcb->asoc.peer_vtag),
7748                                             net->port, so_locked, NULL))) {
7749                                                 if (error == ENOBUFS) {
7750                                                         asoc->ifp_had_enobuf = 1;
7751                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7752                                                 }
7753                                                 if (from_where == 0) {
7754                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7755                                                 }
7756                                                 if (*now_filled == 0) {
7757                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7758                                                         *now_filled = 1;
7759                                                         *now = net->last_sent_time;
7760                                                 } else {
7761                                                         net->last_sent_time = *now;
7762                                                 }
7763                                                 hbflag = 0;
7764                                                 /* error, could not output */
7765                                                 if (error == EHOSTUNREACH) {
7766                                                         /*
7767                                                          * Destination went
7768                                                          * unreachable
7769                                                          * during this send
7770                                                          */
7771                                                         sctp_move_to_an_alt(stcb, asoc, net);
7772                                                 }
7773                                                 *reason_code = 7;
7774                                                 continue;
7775                                         } else
7776                                                 asoc->ifp_had_enobuf = 0;
7777                                         if (*now_filled == 0) {
7778                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7779                                                 *now_filled = 1;
7780                                                 *now = net->last_sent_time;
7781                                         } else {
7782                                                 net->last_sent_time = *now;
7783                                         }
7784                                         hbflag = 0;
7785                                         /*
7786                                          * increase the number we sent, if a
7787                                          * cookie is sent we don't tell them
7788                                          * any was sent out.
7789                                          */
7790                                         outchain = endoutchain = NULL;
7791                                         auth = NULL;
7792                                         auth_offset = 0;
7793                                         if (!no_out_cnt)
7794                                                 *num_out += ctl_cnt;
7795                                         /* recalc a clean slate and setup */
7796                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7797                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7798                                         } else {
7799                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7800                                         }
7801                                         to_out = 0;
7802                                         no_fragmentflg = 1;
7803                                 }
7804                         }
7805                 }
7806                 /************************/
7807                 /* Control transmission */
7808                 /************************/
7809                 /* Now first lets go through the control queue */
7810                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7811                     chk; chk = nchk) {
7812                         nchk = TAILQ_NEXT(chk, sctp_next);
7813                         if (chk->whoTo != net) {
7814                                 /*
7815                                  * No, not sent to the network we are
7816                                  * looking at
7817                                  */
7818                                 continue;
7819                         }
7820                         if (chk->data == NULL) {
7821                                 continue;
7822                         }
7823                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7824                                 /*
7825                                  * It must be unsent. Cookies and ASCONF's
7826                                  * hang around but there timers will force
7827                                  * when marked for resend.
7828                                  */
7829                                 continue;
7830                         }
7831                         /*
7832                          * if no AUTH is yet included and this chunk
7833                          * requires it, make sure to account for it.  We
7834                          * don't apply the size until the AUTH chunk is
7835                          * actually added below in case there is no room for
7836                          * this chunk. NOTE: we overload the use of "omtu"
7837                          * here
7838                          */
7839                         if ((auth == NULL) &&
7840                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7841                             stcb->asoc.peer_auth_chunks)) {
7842                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7843                         } else
7844                                 omtu = 0;
7845                         /* Here we do NOT factor the r_mtu */
7846                         if ((chk->send_size < (int)(mtu - omtu)) ||
7847                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7848                                 /*
7849                                  * We probably should glom the mbuf chain
7850                                  * from the chk->data for control but the
7851                                  * problem is it becomes yet one more level
7852                                  * of tracking to do if for some reason
7853                                  * output fails. Then I have got to
7854                                  * reconstruct the merged control chain.. el
7855                                  * yucko.. for now we take the easy way and
7856                                  * do the copy
7857                                  */
7858                                 /*
7859                                  * Add an AUTH chunk, if chunk requires it
7860                                  * save the offset into the chain for AUTH
7861                                  */
7862                                 if ((auth == NULL) &&
7863                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7864                                     stcb->asoc.peer_auth_chunks))) {
7865                                         outchain = sctp_add_auth_chunk(outchain,
7866                                             &endoutchain,
7867                                             &auth,
7868                                             &auth_offset,
7869                                             stcb,
7870                                             chk->rec.chunk_id.id);
7871                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7872                                 }
7873                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7874                                     (int)chk->rec.chunk_id.can_take_data,
7875                                     chk->send_size, chk->copy_by_ref);
7876                                 if (outchain == NULL) {
7877                                         *reason_code = 8;
7878                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7879                                         return (ENOMEM);
7880                                 }
7881                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7882                                 /* update our MTU size */
7883                                 if (mtu > (chk->send_size + omtu))
7884                                         mtu -= (chk->send_size + omtu);
7885                                 else
7886                                         mtu = 0;
7887                                 to_out += (chk->send_size + omtu);
7888                                 /* Do clear IP_DF ? */
7889                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7890                                         no_fragmentflg = 0;
7891                                 }
7892                                 if (chk->rec.chunk_id.can_take_data)
7893                                         chk->data = NULL;
7894                                 /* Mark things to be removed, if needed */
7895                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7896                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7897                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7898                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7899                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7900                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7901                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7902                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7903                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7904                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7905                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7906
7907                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7908                                                 hbflag = 1;
7909                                                 /*
7910                                                  * JRS 5/14/07 - Set the
7911                                                  * flag to say a heartbeat
7912                                                  * is being sent.
7913                                                  */
7914                                                 pf_hbflag = 1;
7915                                         }
7916                                         /* remove these chunks at the end */
7917                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7918                                                 /* turn off the timer */
7919                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7920                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7921                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7922                                                 }
7923                                         }
7924                                         /*
7925                                          * EY -Nr-sack version of the above
7926                                          * if statement
7927                                          */
7928                                         if ((SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) &&
7929                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {  /* EY !?! */
7930                                                 /* turn off the timer */
7931                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7932                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7933                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7934                                                 }
7935                                         }
7936                                         ctl_cnt++;
7937                                 } else {
7938                                         /*
7939                                          * Other chunks, since they have
7940                                          * timers running (i.e. COOKIE) we
7941                                          * just "trust" that it gets sent or
7942                                          * retransmitted.
7943                                          */
7944                                         ctl_cnt++;
7945                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7946                                                 cookie = 1;
7947                                                 no_out_cnt = 1;
7948                                         }
7949                                         chk->sent = SCTP_DATAGRAM_SENT;
7950                                         chk->snd_count++;
7951                                 }
7952                                 if (mtu == 0) {
7953                                         /*
7954                                          * Ok we are out of room but we can
7955                                          * output without effecting the
7956                                          * flight size since this little guy
7957                                          * is a control only packet.
7958                                          */
7959                                         if (asconf) {
7960                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7961                                                 /*
7962                                                  * do NOT clear the asconf
7963                                                  * flag as it is used to do
7964                                                  * appropriate source
7965                                                  * address selection.
7966                                                  */
7967                                         }
7968                                         if (cookie) {
7969                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7970                                                 cookie = 0;
7971                                         }
7972                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7973                                             (struct sockaddr *)&net->ro._l_addr,
7974                                             outchain,
7975                                             auth_offset, auth,
7976                                             stcb->asoc.authinfo.active_keyid,
7977                                             no_fragmentflg, 0, NULL, asconf,
7978                                             inp->sctp_lport, stcb->rport,
7979                                             htonl(stcb->asoc.peer_vtag),
7980                                             net->port, so_locked, NULL))) {
7981                                                 if (error == ENOBUFS) {
7982                                                         asoc->ifp_had_enobuf = 1;
7983                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7984                                                 }
7985                                                 if (from_where == 0) {
7986                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7987                                                 }
7988                                                 /* error, could not output */
7989                                                 if (hbflag) {
7990                                                         if (*now_filled == 0) {
7991                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7992                                                                 *now_filled = 1;
7993                                                                 *now = net->last_sent_time;
7994                                                         } else {
7995                                                                 net->last_sent_time = *now;
7996                                                         }
7997                                                         hbflag = 0;
7998                                                 }
7999                                                 if (error == EHOSTUNREACH) {
8000                                                         /*
8001                                                          * Destination went
8002                                                          * unreachable
8003                                                          * during this send
8004                                                          */
8005                                                         sctp_move_to_an_alt(stcb, asoc, net);
8006                                                 }
8007                                                 *reason_code = 7;
8008                                                 continue;
8009                                         } else
8010                                                 asoc->ifp_had_enobuf = 0;
8011                                         /* Only HB or ASCONF advances time */
8012                                         if (hbflag) {
8013                                                 if (*now_filled == 0) {
8014                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8015                                                         *now_filled = 1;
8016                                                         *now = net->last_sent_time;
8017                                                 } else {
8018                                                         net->last_sent_time = *now;
8019                                                 }
8020                                                 hbflag = 0;
8021                                         }
8022                                         /*
8023                                          * increase the number we sent, if a
8024                                          * cookie is sent we don't tell them
8025                                          * any was sent out.
8026                                          */
8027                                         outchain = endoutchain = NULL;
8028                                         auth = NULL;
8029                                         auth_offset = 0;
8030                                         if (!no_out_cnt)
8031                                                 *num_out += ctl_cnt;
8032                                         /* recalc a clean slate and setup */
8033                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8034                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8035                                         } else {
8036                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8037                                         }
8038                                         to_out = 0;
8039                                         no_fragmentflg = 1;
8040                                 }
8041                         }
8042                 }
8043                 /* JRI: if dest is in PF state, do not send data to it */
8044                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8045                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8046                     (net->dest_state & SCTP_ADDR_PF)) {
8047                         goto no_data_fill;
8048                 }
8049                 if (net->flight_size >= net->cwnd) {
8050                         goto no_data_fill;
8051                 }
8052                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) &&
8053                     (net->flight_size > max_rwnd_per_dest)) {
8054                         goto no_data_fill;
8055                 }
8056                 /*********************/
8057                 /* Data transmission */
8058                 /*********************/
8059                 /*
8060                  * if AUTH for DATA is required and no AUTH has been added
8061                  * yet, account for this in the mtu now... if no data can be
8062                  * bundled, this adjustment won't matter anyways since the
8063                  * packet will be going out...
8064                  */
8065                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8066                     stcb->asoc.peer_auth_chunks);
8067                 if (data_auth_reqd && (auth == NULL)) {
8068                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8069                 }
8070                 /* now lets add any data within the MTU constraints */
8071                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8072                 case AF_INET:
8073                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8074                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8075                         else
8076                                 omtu = 0;
8077                         break;
8078 #ifdef INET6
8079                 case AF_INET6:
8080                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8081                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8082                         else
8083                                 omtu = 0;
8084                         break;
8085 #endif
8086                 default:
8087                         /* TSNH */
8088                         omtu = 0;
8089                         break;
8090                 }
8091                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8092                     (skip_data_for_this_net == 0)) ||
8093                     (cookie)) {
8094                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8095                                 if (no_data_chunks) {
8096                                         /* let only control go out */
8097                                         *reason_code = 1;
8098                                         break;
8099                                 }
8100                                 if (net->flight_size >= net->cwnd) {
8101                                         /* skip this net, no room for data */
8102                                         *reason_code = 2;
8103                                         break;
8104                                 }
8105                                 nchk = TAILQ_NEXT(chk, sctp_next);
8106                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
8107                                         if (chk->whoTo != net) {
8108                                                 /*
8109                                                  * For CMT, steal the data
8110                                                  * to this network if its
8111                                                  * not set here.
8112                                                  */
8113                                                 sctp_free_remote_addr(chk->whoTo);
8114                                                 chk->whoTo = net;
8115                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8116                                         }
8117                                 } else if (chk->whoTo != net) {
8118                                         /* No, not sent to this net */
8119                                         continue;
8120                                 }
8121                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8122                                         /*-
8123                                          * strange, we have a chunk that is
8124                                          * to big for its destination and
8125                                          * yet no fragment ok flag.
8126                                          * Something went wrong when the
8127                                          * PMTU changed...we did not mark
8128                                          * this chunk for some reason?? I
8129                                          * will fix it here by letting IP
8130                                          * fragment it for now and printing
8131                                          * a warning. This really should not
8132                                          * happen ...
8133                                          */
8134                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8135                                             chk->send_size, mtu);
8136                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8137                                 }
8138                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8139                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8140                                         struct sctp_data_chunk *dchkh;
8141
8142                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8143                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8144                                 }
8145                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8146                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8147                                         /* ok we will add this one */
8148
8149                                         /*
8150                                          * Add an AUTH chunk, if chunk
8151                                          * requires it, save the offset into
8152                                          * the chain for AUTH
8153                                          */
8154                                         if (data_auth_reqd) {
8155                                                 if (auth == NULL) {
8156                                                         outchain = sctp_add_auth_chunk(outchain,
8157                                                             &endoutchain,
8158                                                             &auth,
8159                                                             &auth_offset,
8160                                                             stcb,
8161                                                             SCTP_DATA);
8162                                                         auth_keyid = chk->auth_keyid;
8163                                                         override_ok = 0;
8164                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8165                                                 } else if (override_ok) {
8166                                                         /*
8167                                                          * use this data's
8168                                                          * keyid
8169                                                          */
8170                                                         auth_keyid = chk->auth_keyid;
8171                                                         override_ok = 0;
8172                                                 } else if (auth_keyid != chk->auth_keyid) {
8173                                                         /*
8174                                                          * different keyid,
8175                                                          * so done bundling
8176                                                          */
8177                                                         break;
8178                                                 }
8179                                         }
8180                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8181                                             chk->send_size, chk->copy_by_ref);
8182                                         if (outchain == NULL) {
8183                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8184                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8185                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8186                                                 }
8187                                                 *reason_code = 3;
8188                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8189                                                 return (ENOMEM);
8190                                         }
8191                                         /* upate our MTU size */
8192                                         /* Do clear IP_DF ? */
8193                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8194                                                 no_fragmentflg = 0;
8195                                         }
8196                                         /* unsigned subtraction of mtu */
8197                                         if (mtu > chk->send_size)
8198                                                 mtu -= chk->send_size;
8199                                         else
8200                                                 mtu = 0;
8201                                         /* unsigned subtraction of r_mtu */
8202                                         if (r_mtu > chk->send_size)
8203                                                 r_mtu -= chk->send_size;
8204                                         else
8205                                                 r_mtu = 0;
8206
8207                                         to_out += chk->send_size;
8208                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8209 #ifdef INVARIANTS
8210                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8211 #else
8212                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8213                                                     mx_mtu, to_out);
8214 #endif
8215                                         }
8216                                         chk->window_probe = 0;
8217                                         data_list[bundle_at++] = chk;
8218                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8219                                                 mtu = 0;
8220                                                 break;
8221                                         }
8222                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8223                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8224                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8225                                                 } else {
8226                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8227                                                 }
8228                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8229                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8230                                                         /*
8231                                                          * Count number of
8232                                                          * user msg's that
8233                                                          * were fragmented
8234                                                          * we do this by
8235                                                          * counting when we
8236                                                          * see a LAST
8237                                                          * fragment only.
8238                                                          */
8239                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8240                                         }
8241                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8242                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8243                                                         data_list[0]->window_probe = 1;
8244                                                         net->window_probe = 1;
8245                                                 }
8246                                                 break;
8247                                         }
8248                                 } else {
8249                                         /*
8250                                          * Must be sent in order of the
8251                                          * TSN's (on a network)
8252                                          */
8253                                         break;
8254                                 }
8255                         }       /* for (chunk gather loop for this net) */
8256                 }               /* if asoc.state OPEN */
8257 no_data_fill:
8258                 /* Is there something to send for this destination? */
8259                 if (outchain) {
8260                         /* We may need to start a control timer or two */
8261                         if (asconf) {
8262                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8263                                     stcb, net);
8264                                 /*
8265                                  * do NOT clear the asconf flag as it is
8266                                  * used to do appropriate source address
8267                                  * selection.
8268                                  */
8269                         }
8270                         if (cookie) {
8271                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8272                                 cookie = 0;
8273                         }
8274                         /* must start a send timer if data is being sent */
8275                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8276                                 /*
8277                                  * no timer running on this destination
8278                                  * restart it.
8279                                  */
8280                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8281                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8282                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8283                                     pf_hbflag &&
8284                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8285                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8286                                 /*
8287                                  * JRS 5/14/07 - If a HB has been sent to a
8288                                  * PF destination and no T3 timer is
8289                                  * currently running, start the T3 timer to
8290                                  * track the HBs that were sent.
8291                                  */
8292                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8293                         }
8294                         /* Now send it, if there is anything to send :> */
8295                         if ((error = sctp_lowlevel_chunk_output(inp,
8296                             stcb,
8297                             net,
8298                             (struct sockaddr *)&net->ro._l_addr,
8299                             outchain,
8300                             auth_offset,
8301                             auth,
8302                             auth_keyid,
8303                             no_fragmentflg,
8304                             bundle_at,
8305                             data_list[0],
8306                             asconf,
8307                             inp->sctp_lport, stcb->rport,
8308                             htonl(stcb->asoc.peer_vtag),
8309                             net->port, so_locked, NULL))) {
8310                                 /* error, we could not output */
8311                                 if (error == ENOBUFS) {
8312                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8313                                         asoc->ifp_had_enobuf = 1;
8314                                 }
8315                                 if (from_where == 0) {
8316                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8317                                 }
8318                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8319                                 if (hbflag) {
8320                                         if (*now_filled == 0) {
8321                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8322                                                 *now_filled = 1;
8323                                                 *now = net->last_sent_time;
8324                                         } else {
8325                                                 net->last_sent_time = *now;
8326                                         }
8327                                         hbflag = 0;
8328                                 }
8329                                 if (error == EHOSTUNREACH) {
8330                                         /*
8331                                          * Destination went unreachable
8332                                          * during this send
8333                                          */
8334                                         sctp_move_to_an_alt(stcb, asoc, net);
8335                                 }
8336                                 *reason_code = 6;
8337                                 /*-
8338                                  * I add this line to be paranoid. As far as
8339                                  * I can tell the continue, takes us back to
8340                                  * the top of the for, but just to make sure
8341                                  * I will reset these again here.
8342                                  */
8343                                 ctl_cnt = bundle_at = 0;
8344                                 continue;       /* This takes us back to the
8345                                                  * for() for the nets. */
8346                         } else {
8347                                 asoc->ifp_had_enobuf = 0;
8348                         }
8349                         outchain = endoutchain = NULL;
8350                         auth = NULL;
8351                         auth_offset = 0;
8352                         if (bundle_at || hbflag) {
8353                                 /* For data/asconf and hb set time */
8354                                 if (*now_filled == 0) {
8355                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8356                                         *now_filled = 1;
8357                                         *now = net->last_sent_time;
8358                                 } else {
8359                                         net->last_sent_time = *now;
8360                                 }
8361                         }
8362                         if (!no_out_cnt) {
8363                                 *num_out += (ctl_cnt + bundle_at);
8364                         }
8365                         if (bundle_at) {
8366                                 /* setup for a RTO measurement */
8367                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8368                                 /* fill time if not already filled */
8369                                 if (*now_filled == 0) {
8370                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8371                                         *now_filled = 1;
8372                                         *now = asoc->time_last_sent;
8373                                 } else {
8374                                         asoc->time_last_sent = *now;
8375                                 }
8376                                 data_list[0]->do_rtt = 1;
8377                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8378                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8379                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8380                                         if (net->flight_size < net->cwnd) {
8381                                                 /* start or restart it */
8382                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8383                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8384                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8385                                                 }
8386                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8387                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8388                                         } else {
8389                                                 /* stop it if its running */
8390                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8391                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8392                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8393                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8394                                                 }
8395                                         }
8396                                 }
8397                         }
8398                         if (one_chunk) {
8399                                 break;
8400                         }
8401                 }
8402                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8403                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8404                 }
8405         }
8406         if (old_start_at == NULL) {
8407                 old_start_at = start_at;
8408                 start_at = TAILQ_FIRST(&asoc->nets);
8409                 if (old_start_at)
8410                         goto again_one_more_time;
8411         }
8412         /*
8413          * At the end there should be no NON timed chunks hanging on this
8414          * queue.
8415          */
8416         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8417                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8418         }
8419         if ((*num_out == 0) && (*reason_code == 0)) {
8420                 *reason_code = 4;
8421         } else {
8422                 *reason_code = 5;
8423         }
8424         sctp_clean_up_ctl(stcb, asoc);
8425         return (0);
8426 }
8427
8428 void
8429 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8430 {
8431         /*-
8432          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8433          * the control chunk queue.
8434          */
8435         struct sctp_chunkhdr *hdr;
8436         struct sctp_tmit_chunk *chk;
8437         struct mbuf *mat;
8438
8439         SCTP_TCB_LOCK_ASSERT(stcb);
8440         sctp_alloc_a_chunk(stcb, chk);
8441         if (chk == NULL) {
8442                 /* no memory */
8443                 sctp_m_freem(op_err);
8444                 return;
8445         }
8446         chk->copy_by_ref = 0;
8447         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8448         if (op_err == NULL) {
8449                 sctp_free_a_chunk(stcb, chk);
8450                 return;
8451         }
8452         chk->send_size = 0;
8453         mat = op_err;
8454         while (mat != NULL) {
8455                 chk->send_size += SCTP_BUF_LEN(mat);
8456                 mat = SCTP_BUF_NEXT(mat);
8457         }
8458         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8459         chk->rec.chunk_id.can_take_data = 1;
8460         chk->sent = SCTP_DATAGRAM_UNSENT;
8461         chk->snd_count = 0;
8462         chk->flags = 0;
8463         chk->asoc = &stcb->asoc;
8464         chk->data = op_err;
8465         chk->whoTo = chk->asoc->primary_destination;
8466         atomic_add_int(&chk->whoTo->ref_count, 1);
8467         hdr = mtod(op_err, struct sctp_chunkhdr *);
8468         hdr->chunk_type = SCTP_OPERATION_ERROR;
8469         hdr->chunk_flags = 0;
8470         hdr->chunk_length = htons(chk->send_size);
8471         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8472             chk,
8473             sctp_next);
8474         chk->asoc->ctrl_queue_cnt++;
8475 }
8476
8477 int
8478 sctp_send_cookie_echo(struct mbuf *m,
8479     int offset,
8480     struct sctp_tcb *stcb,
8481     struct sctp_nets *net)
8482 {
8483         /*-
8484          * pull out the cookie and put it at the front of the control chunk
8485          * queue.
8486          */
8487         int at;
8488         struct mbuf *cookie;
8489         struct sctp_paramhdr parm, *phdr;
8490         struct sctp_chunkhdr *hdr;
8491         struct sctp_tmit_chunk *chk;
8492         uint16_t ptype, plen;
8493
8494         /* First find the cookie in the param area */
8495         cookie = NULL;
8496         at = offset + sizeof(struct sctp_init_chunk);
8497
8498         SCTP_TCB_LOCK_ASSERT(stcb);
8499         do {
8500                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8501                 if (phdr == NULL) {
8502                         return (-3);
8503                 }
8504                 ptype = ntohs(phdr->param_type);
8505                 plen = ntohs(phdr->param_length);
8506                 if (ptype == SCTP_STATE_COOKIE) {
8507                         int pad;
8508
8509                         /* found the cookie */
8510                         if ((pad = (plen % 4))) {
8511                                 plen += 4 - pad;
8512                         }
8513                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8514                         if (cookie == NULL) {
8515                                 /* No memory */
8516                                 return (-2);
8517                         }
8518 #ifdef SCTP_MBUF_LOGGING
8519                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8520                                 struct mbuf *mat;
8521
8522                                 mat = cookie;
8523                                 while (mat) {
8524                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8525                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8526                                         }
8527                                         mat = SCTP_BUF_NEXT(mat);
8528                                 }
8529                         }
8530 #endif
8531                         break;
8532                 }
8533                 at += SCTP_SIZE32(plen);
8534         } while (phdr);
8535         if (cookie == NULL) {
8536                 /* Did not find the cookie */
8537                 return (-3);
8538         }
8539         /* ok, we got the cookie lets change it into a cookie echo chunk */
8540
8541         /* first the change from param to cookie */
8542         hdr = mtod(cookie, struct sctp_chunkhdr *);
8543         hdr->chunk_type = SCTP_COOKIE_ECHO;
8544         hdr->chunk_flags = 0;
8545         /* get the chunk stuff now and place it in the FRONT of the queue */
8546         sctp_alloc_a_chunk(stcb, chk);
8547         if (chk == NULL) {
8548                 /* no memory */
8549                 sctp_m_freem(cookie);
8550                 return (-5);
8551         }
8552         chk->copy_by_ref = 0;
8553         chk->send_size = plen;
8554         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8555         chk->rec.chunk_id.can_take_data = 0;
8556         chk->sent = SCTP_DATAGRAM_UNSENT;
8557         chk->snd_count = 0;
8558         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8559         chk->asoc = &stcb->asoc;
8560         chk->data = cookie;
8561         chk->whoTo = chk->asoc->primary_destination;
8562         atomic_add_int(&chk->whoTo->ref_count, 1);
8563         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8564         chk->asoc->ctrl_queue_cnt++;
8565         return (0);
8566 }
8567
8568 void
8569 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8570     struct mbuf *m,
8571     int offset,
8572     int chk_length,
8573     struct sctp_nets *net)
8574 {
8575         /*
8576          * take a HB request and make it into a HB ack and send it.
8577          */
8578         struct mbuf *outchain;
8579         struct sctp_chunkhdr *chdr;
8580         struct sctp_tmit_chunk *chk;
8581
8582
8583         if (net == NULL)
8584                 /* must have a net pointer */
8585                 return;
8586
8587         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8588         if (outchain == NULL) {
8589                 /* gak out of memory */
8590                 return;
8591         }
8592 #ifdef SCTP_MBUF_LOGGING
8593         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8594                 struct mbuf *mat;
8595
8596                 mat = outchain;
8597                 while (mat) {
8598                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8599                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8600                         }
8601                         mat = SCTP_BUF_NEXT(mat);
8602                 }
8603         }
8604 #endif
8605         chdr = mtod(outchain, struct sctp_chunkhdr *);
8606         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8607         chdr->chunk_flags = 0;
8608         if (chk_length % 4) {
8609                 /* need pad */
8610                 uint32_t cpthis = 0;
8611                 int padlen;
8612
8613                 padlen = 4 - (chk_length % 4);
8614                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8615         }
8616         sctp_alloc_a_chunk(stcb, chk);
8617         if (chk == NULL) {
8618                 /* no memory */
8619                 sctp_m_freem(outchain);
8620                 return;
8621         }
8622         chk->copy_by_ref = 0;
8623         chk->send_size = chk_length;
8624         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8625         chk->rec.chunk_id.can_take_data = 1;
8626         chk->sent = SCTP_DATAGRAM_UNSENT;
8627         chk->snd_count = 0;
8628         chk->flags = 0;
8629         chk->asoc = &stcb->asoc;
8630         chk->data = outchain;
8631         chk->whoTo = net;
8632         atomic_add_int(&chk->whoTo->ref_count, 1);
8633         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8634         chk->asoc->ctrl_queue_cnt++;
8635 }
8636
8637 void
8638 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8639 {
8640         /* formulate and queue a cookie-ack back to sender */
8641         struct mbuf *cookie_ack;
8642         struct sctp_chunkhdr *hdr;
8643         struct sctp_tmit_chunk *chk;
8644
8645         cookie_ack = NULL;
8646         SCTP_TCB_LOCK_ASSERT(stcb);
8647
8648         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8649         if (cookie_ack == NULL) {
8650                 /* no mbuf's */
8651                 return;
8652         }
8653         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8654         sctp_alloc_a_chunk(stcb, chk);
8655         if (chk == NULL) {
8656                 /* no memory */
8657                 sctp_m_freem(cookie_ack);
8658                 return;
8659         }
8660         chk->copy_by_ref = 0;
8661         chk->send_size = sizeof(struct sctp_chunkhdr);
8662         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8663         chk->rec.chunk_id.can_take_data = 1;
8664         chk->sent = SCTP_DATAGRAM_UNSENT;
8665         chk->snd_count = 0;
8666         chk->flags = 0;
8667         chk->asoc = &stcb->asoc;
8668         chk->data = cookie_ack;
8669         if (chk->asoc->last_control_chunk_from != NULL) {
8670                 chk->whoTo = chk->asoc->last_control_chunk_from;
8671         } else {
8672                 chk->whoTo = chk->asoc->primary_destination;
8673         }
8674         atomic_add_int(&chk->whoTo->ref_count, 1);
8675         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8676         hdr->chunk_type = SCTP_COOKIE_ACK;
8677         hdr->chunk_flags = 0;
8678         hdr->chunk_length = htons(chk->send_size);
8679         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8680         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8681         chk->asoc->ctrl_queue_cnt++;
8682         return;
8683 }
8684
8685
8686 void
8687 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8688 {
8689         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8690         struct mbuf *m_shutdown_ack;
8691         struct sctp_shutdown_ack_chunk *ack_cp;
8692         struct sctp_tmit_chunk *chk;
8693
8694         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8695         if (m_shutdown_ack == NULL) {
8696                 /* no mbuf's */
8697                 return;
8698         }
8699         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8700         sctp_alloc_a_chunk(stcb, chk);
8701         if (chk == NULL) {
8702                 /* no memory */
8703                 sctp_m_freem(m_shutdown_ack);
8704                 return;
8705         }
8706         chk->copy_by_ref = 0;
8707         chk->send_size = sizeof(struct sctp_chunkhdr);
8708         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8709         chk->rec.chunk_id.can_take_data = 1;
8710         chk->sent = SCTP_DATAGRAM_UNSENT;
8711         chk->snd_count = 0;
8712         chk->flags = 0;
8713         chk->asoc = &stcb->asoc;
8714         chk->data = m_shutdown_ack;
8715         chk->whoTo = net;
8716         atomic_add_int(&net->ref_count, 1);
8717
8718         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8719         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8720         ack_cp->ch.chunk_flags = 0;
8721         ack_cp->ch.chunk_length = htons(chk->send_size);
8722         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8723         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8724         chk->asoc->ctrl_queue_cnt++;
8725         return;
8726 }
8727
8728 void
8729 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8730 {
8731         /* formulate and queue a SHUTDOWN to the sender */
8732         struct mbuf *m_shutdown;
8733         struct sctp_shutdown_chunk *shutdown_cp;
8734         struct sctp_tmit_chunk *chk;
8735
8736         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8737         if (m_shutdown == NULL) {
8738                 /* no mbuf's */
8739                 return;
8740         }
8741         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8742         sctp_alloc_a_chunk(stcb, chk);
8743         if (chk == NULL) {
8744                 /* no memory */
8745                 sctp_m_freem(m_shutdown);
8746                 return;
8747         }
8748         chk->copy_by_ref = 0;
8749         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8750         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8751         chk->rec.chunk_id.can_take_data = 1;
8752         chk->sent = SCTP_DATAGRAM_UNSENT;
8753         chk->snd_count = 0;
8754         chk->flags = 0;
8755         chk->asoc = &stcb->asoc;
8756         chk->data = m_shutdown;
8757         chk->whoTo = net;
8758         atomic_add_int(&net->ref_count, 1);
8759
8760         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8761         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8762         shutdown_cp->ch.chunk_flags = 0;
8763         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8764         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8765         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8766         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8767         chk->asoc->ctrl_queue_cnt++;
8768         return;
8769 }
8770
8771 void
8772 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8773 {
8774         /*
8775          * formulate and queue an ASCONF to the peer. ASCONF parameters
8776          * should be queued on the assoc queue.
8777          */
8778         struct sctp_tmit_chunk *chk;
8779         struct mbuf *m_asconf;
8780         int len;
8781
8782         SCTP_TCB_LOCK_ASSERT(stcb);
8783
8784         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8785             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8786                 /* can't send a new one if there is one in flight already */
8787                 return;
8788         }
8789         /* compose an ASCONF chunk, maximum length is PMTU */
8790         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8791         if (m_asconf == NULL) {
8792                 return;
8793         }
8794         sctp_alloc_a_chunk(stcb, chk);
8795         if (chk == NULL) {
8796                 /* no memory */
8797                 sctp_m_freem(m_asconf);
8798                 return;
8799         }
8800         chk->copy_by_ref = 0;
8801         chk->data = m_asconf;
8802         chk->send_size = len;
8803         chk->rec.chunk_id.id = SCTP_ASCONF;
8804         chk->rec.chunk_id.can_take_data = 0;
8805         chk->sent = SCTP_DATAGRAM_UNSENT;
8806         chk->snd_count = 0;
8807         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8808         chk->asoc = &stcb->asoc;
8809         chk->whoTo = net;
8810         atomic_add_int(&chk->whoTo->ref_count, 1);
8811         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8812         chk->asoc->ctrl_queue_cnt++;
8813         return;
8814 }
8815
8816 void
8817 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8818 {
8819         /*
8820          * formulate and queue a asconf-ack back to sender. the asconf-ack
8821          * must be stored in the tcb.
8822          */
8823         struct sctp_tmit_chunk *chk;
8824         struct sctp_asconf_ack *ack, *latest_ack;
8825         struct mbuf *m_ack, *m;
8826         struct sctp_nets *net = NULL;
8827
8828         SCTP_TCB_LOCK_ASSERT(stcb);
8829         /* Get the latest ASCONF-ACK */
8830         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8831         if (latest_ack == NULL) {
8832                 return;
8833         }
8834         if (latest_ack->last_sent_to != NULL &&
8835             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8836                 /* we're doing a retransmission */
8837                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8838                 if (net == NULL) {
8839                         /* no alternate */
8840                         if (stcb->asoc.last_control_chunk_from == NULL)
8841                                 net = stcb->asoc.primary_destination;
8842                         else
8843                                 net = stcb->asoc.last_control_chunk_from;
8844                 }
8845         } else {
8846                 /* normal case */
8847                 if (stcb->asoc.last_control_chunk_from == NULL)
8848                         net = stcb->asoc.primary_destination;
8849                 else
8850                         net = stcb->asoc.last_control_chunk_from;
8851         }
8852         latest_ack->last_sent_to = net;
8853
8854         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8855                 if (ack->data == NULL) {
8856                         continue;
8857                 }
8858                 /* copy the asconf_ack */
8859                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8860                 if (m_ack == NULL) {
8861                         /* couldn't copy it */
8862                         return;
8863                 }
8864 #ifdef SCTP_MBUF_LOGGING
8865                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8866                         struct mbuf *mat;
8867
8868                         mat = m_ack;
8869                         while (mat) {
8870                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8871                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8872                                 }
8873                                 mat = SCTP_BUF_NEXT(mat);
8874                         }
8875                 }
8876 #endif
8877
8878                 sctp_alloc_a_chunk(stcb, chk);
8879                 if (chk == NULL) {
8880                         /* no memory */
8881                         if (m_ack)
8882                                 sctp_m_freem(m_ack);
8883                         return;
8884                 }
8885                 chk->copy_by_ref = 0;
8886
8887                 chk->whoTo = net;
8888                 chk->data = m_ack;
8889                 chk->send_size = 0;
8890                 /* Get size */
8891                 m = m_ack;
8892                 chk->send_size = ack->len;
8893                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8894                 chk->rec.chunk_id.can_take_data = 1;
8895                 chk->sent = SCTP_DATAGRAM_UNSENT;
8896                 chk->snd_count = 0;
8897                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8898                 chk->asoc = &stcb->asoc;
8899                 atomic_add_int(&chk->whoTo->ref_count, 1);
8900
8901                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8902                 chk->asoc->ctrl_queue_cnt++;
8903         }
8904         return;
8905 }
8906
8907
8908 static int
8909 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8910     struct sctp_tcb *stcb,
8911     struct sctp_association *asoc,
8912     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8913 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8914     SCTP_UNUSED
8915 #endif
8916 )
8917 {
8918         /*-
8919          * send out one MTU of retransmission. If fast_retransmit is
8920          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8921          * rwnd. For a Cookie or Asconf in the control chunk queue we
8922          * retransmit them by themselves.
8923          *
8924          * For data chunks we will pick out the lowest TSN's in the sent_queue
8925          * marked for resend and bundle them all together (up to a MTU of
8926          * destination). The address to send to should have been
8927          * selected/changed where the retransmission was marked (i.e. in FR
8928          * or t3-timeout routines).
8929          */
8930         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8931         struct sctp_tmit_chunk *chk, *fwd;
8932         struct mbuf *m, *endofchain;
8933         struct sctp_nets *net = NULL;
8934         uint32_t tsns_sent = 0;
8935         int no_fragmentflg, bundle_at, cnt_thru;
8936         unsigned int mtu;
8937         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8938         struct sctp_auth_chunk *auth = NULL;
8939         uint32_t auth_offset = 0;
8940         uint16_t auth_keyid;
8941         int override_ok = 1;
8942         int data_auth_reqd = 0;
8943         uint32_t dmtu = 0;
8944
8945         SCTP_TCB_LOCK_ASSERT(stcb);
8946         tmr_started = ctl_cnt = bundle_at = error = 0;
8947         no_fragmentflg = 1;
8948         fwd_tsn = 0;
8949         *cnt_out = 0;
8950         fwd = NULL;
8951         endofchain = m = NULL;
8952         auth_keyid = stcb->asoc.authinfo.active_keyid;
8953 #ifdef SCTP_AUDITING_ENABLED
8954         sctp_audit_log(0xC3, 1);
8955 #endif
8956         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8957             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8958                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8959                     asoc->sent_queue_retran_cnt);
8960                 asoc->sent_queue_cnt = 0;
8961                 asoc->sent_queue_cnt_removeable = 0;
8962                 /* send back 0/0 so we enter normal transmission */
8963                 *cnt_out = 0;
8964                 return (0);
8965         }
8966         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8967                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8968                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8969                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8970                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8971                                 if (chk != asoc->str_reset) {
8972                                         /*
8973                                          * not eligible for retran if its
8974                                          * not ours
8975                                          */
8976                                         continue;
8977                                 }
8978                         }
8979                         ctl_cnt++;
8980                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8981                                 fwd_tsn = 1;
8982                                 fwd = chk;
8983                         }
8984                         /*
8985                          * Add an AUTH chunk, if chunk requires it save the
8986                          * offset into the chain for AUTH
8987                          */
8988                         if ((auth == NULL) &&
8989                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8990                             stcb->asoc.peer_auth_chunks))) {
8991                                 m = sctp_add_auth_chunk(m, &endofchain,
8992                                     &auth, &auth_offset,
8993                                     stcb,
8994                                     chk->rec.chunk_id.id);
8995                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8996                         }
8997                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8998                         break;
8999                 }
9000         }
9001         one_chunk = 0;
9002         cnt_thru = 0;
9003         /* do we have control chunks to retransmit? */
9004         if (m != NULL) {
9005                 /* Start a timer no matter if we suceed or fail */
9006                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9007                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9008                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9009                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9010                 chk->snd_count++;       /* update our count */
9011                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9012                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9013                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9014                     no_fragmentflg, 0, NULL, 0,
9015                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9016                     chk->whoTo->port, so_locked, NULL))) {
9017                         SCTP_STAT_INCR(sctps_lowlevelerr);
9018                         return (error);
9019                 }
9020                 m = endofchain = NULL;
9021                 auth = NULL;
9022                 auth_offset = 0;
9023                 /*
9024                  * We don't want to mark the net->sent time here since this
9025                  * we use this for HB and retrans cannot measure RTT
9026                  */
9027                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9028                 *cnt_out += 1;
9029                 chk->sent = SCTP_DATAGRAM_SENT;
9030                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9031                 if (fwd_tsn == 0) {
9032                         return (0);
9033                 } else {
9034                         /* Clean up the fwd-tsn list */
9035                         sctp_clean_up_ctl(stcb, asoc);
9036                         return (0);
9037                 }
9038         }
9039         /*
9040          * Ok, it is just data retransmission we need to do or that and a
9041          * fwd-tsn with it all.
9042          */
9043         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9044                 return (SCTP_RETRAN_DONE);
9045         }
9046         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9047             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9048                 /* not yet open, resend the cookie and that is it */
9049                 return (1);
9050         }
9051 #ifdef SCTP_AUDITING_ENABLED
9052         sctp_auditing(20, inp, stcb, NULL);
9053 #endif
9054         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9055         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9056                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9057                         /* No, not sent to this net or not ready for rtx */
9058                         continue;
9059                 }
9060                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9061                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9062                         /* Gak, we have exceeded max unlucky retran, abort! */
9063                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9064                             chk->snd_count,
9065                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9066                         atomic_add_int(&stcb->asoc.refcnt, 1);
9067                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9068                         SCTP_TCB_LOCK(stcb);
9069                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9070                         return (SCTP_RETRAN_EXIT);
9071                 }
9072                 /* pick up the net */
9073                 net = chk->whoTo;
9074                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9075                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9076                 } else {
9077                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9078                 }
9079
9080                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9081                         /* No room in peers rwnd */
9082                         uint32_t tsn;
9083
9084                         tsn = asoc->last_acked_seq + 1;
9085                         if (tsn == chk->rec.data.TSN_seq) {
9086                                 /*
9087                                  * we make a special exception for this
9088                                  * case. The peer has no rwnd but is missing
9089                                  * the lowest chunk.. which is probably what
9090                                  * is holding up the rwnd.
9091                                  */
9092                                 goto one_chunk_around;
9093                         }
9094                         return (1);
9095                 }
9096 one_chunk_around:
9097                 if (asoc->peers_rwnd < mtu) {
9098                         one_chunk = 1;
9099                         if ((asoc->peers_rwnd == 0) &&
9100                             (asoc->total_flight == 0)) {
9101                                 chk->window_probe = 1;
9102                                 chk->whoTo->window_probe = 1;
9103                         }
9104                 }
9105 #ifdef SCTP_AUDITING_ENABLED
9106                 sctp_audit_log(0xC3, 2);
9107 #endif
9108                 bundle_at = 0;
9109                 m = NULL;
9110                 net->fast_retran_ip = 0;
9111                 if (chk->rec.data.doing_fast_retransmit == 0) {
9112                         /*
9113                          * if no FR in progress skip destination that have
9114                          * flight_size > cwnd.
9115                          */
9116                         if (net->flight_size >= net->cwnd) {
9117                                 continue;
9118                         }
9119                 } else {
9120                         /*
9121                          * Mark the destination net to have FR recovery
9122                          * limits put on it.
9123                          */
9124                         *fr_done = 1;
9125                         net->fast_retran_ip = 1;
9126                 }
9127
9128                 /*
9129                  * if no AUTH is yet included and this chunk requires it,
9130                  * make sure to account for it.  We don't apply the size
9131                  * until the AUTH chunk is actually added below in case
9132                  * there is no room for this chunk.
9133                  */
9134                 if (data_auth_reqd && (auth == NULL)) {
9135                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9136                 } else
9137                         dmtu = 0;
9138
9139                 if ((chk->send_size <= (mtu - dmtu)) ||
9140                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9141                         /* ok we will add this one */
9142                         if (data_auth_reqd) {
9143                                 if (auth == NULL) {
9144                                         m = sctp_add_auth_chunk(m,
9145                                             &endofchain,
9146                                             &auth,
9147                                             &auth_offset,
9148                                             stcb,
9149                                             SCTP_DATA);
9150                                         auth_keyid = chk->auth_keyid;
9151                                         override_ok = 0;
9152                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9153                                 } else if (override_ok) {
9154                                         auth_keyid = chk->auth_keyid;
9155                                         override_ok = 0;
9156                                 } else if (chk->auth_keyid != auth_keyid) {
9157                                         /* different keyid, so done bundling */
9158                                         break;
9159                                 }
9160                         }
9161                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9162                         if (m == NULL) {
9163                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9164                                 return (ENOMEM);
9165                         }
9166                         /* Do clear IP_DF ? */
9167                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9168                                 no_fragmentflg = 0;
9169                         }
9170                         /* upate our MTU size */
9171                         if (mtu > (chk->send_size + dmtu))
9172                                 mtu -= (chk->send_size + dmtu);
9173                         else
9174                                 mtu = 0;
9175                         data_list[bundle_at++] = chk;
9176                         if (one_chunk && (asoc->total_flight <= 0)) {
9177                                 SCTP_STAT_INCR(sctps_windowprobed);
9178                         }
9179                 }
9180                 if (one_chunk == 0) {
9181                         /*
9182                          * now are there anymore forward from chk to pick
9183                          * up?
9184                          */
9185                         fwd = TAILQ_NEXT(chk, sctp_next);
9186                         while (fwd) {
9187                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9188                                         /* Nope, not for retran */
9189                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9190                                         continue;
9191                                 }
9192                                 if (fwd->whoTo != net) {
9193                                         /* Nope, not the net in question */
9194                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9195                                         continue;
9196                                 }
9197                                 if (data_auth_reqd && (auth == NULL)) {
9198                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9199                                 } else
9200                                         dmtu = 0;
9201                                 if (fwd->send_size <= (mtu - dmtu)) {
9202                                         if (data_auth_reqd) {
9203                                                 if (auth == NULL) {
9204                                                         m = sctp_add_auth_chunk(m,
9205                                                             &endofchain,
9206                                                             &auth,
9207                                                             &auth_offset,
9208                                                             stcb,
9209                                                             SCTP_DATA);
9210                                                         auth_keyid = fwd->auth_keyid;
9211                                                         override_ok = 0;
9212                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9213                                                 } else if (override_ok) {
9214                                                         auth_keyid = fwd->auth_keyid;
9215                                                         override_ok = 0;
9216                                                 } else if (fwd->auth_keyid != auth_keyid) {
9217                                                         /*
9218                                                          * different keyid,
9219                                                          * so done bundling
9220                                                          */
9221                                                         break;
9222                                                 }
9223                                         }
9224                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9225                                         if (m == NULL) {
9226                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9227                                                 return (ENOMEM);
9228                                         }
9229                                         /* Do clear IP_DF ? */
9230                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9231                                                 no_fragmentflg = 0;
9232                                         }
9233                                         /* upate our MTU size */
9234                                         if (mtu > (fwd->send_size + dmtu))
9235                                                 mtu -= (fwd->send_size + dmtu);
9236                                         else
9237                                                 mtu = 0;
9238                                         data_list[bundle_at++] = fwd;
9239                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9240                                                 break;
9241                                         }
9242                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9243                                 } else {
9244                                         /* can't fit so we are done */
9245                                         break;
9246                                 }
9247                         }
9248                 }
9249                 /* Is there something to send for this destination? */
9250                 if (m) {
9251                         /*
9252                          * No matter if we fail/or suceed we should start a
9253                          * timer. A failure is like a lost IP packet :-)
9254                          */
9255                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9256                                 /*
9257                                  * no timer running on this destination
9258                                  * restart it.
9259                                  */
9260                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9261                                 tmr_started = 1;
9262                         }
9263                         /* Now lets send it, if there is anything to send :> */
9264                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9265                             (struct sockaddr *)&net->ro._l_addr, m,
9266                             auth_offset, auth, auth_keyid,
9267                             no_fragmentflg, 0, NULL, 0,
9268                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9269                             net->port, so_locked, NULL))) {
9270                                 /* error, we could not output */
9271                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9272                                 return (error);
9273                         }
9274                         m = endofchain = NULL;
9275                         auth = NULL;
9276                         auth_offset = 0;
9277                         /* For HB's */
9278                         /*
9279                          * We don't want to mark the net->sent time here
9280                          * since this we use this for HB and retrans cannot
9281                          * measure RTT
9282                          */
9283                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9284
9285                         /* For auto-close */
9286                         cnt_thru++;
9287                         if (*now_filled == 0) {
9288                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9289                                 *now = asoc->time_last_sent;
9290                                 *now_filled = 1;
9291                         } else {
9292                                 asoc->time_last_sent = *now;
9293                         }
9294                         *cnt_out += bundle_at;
9295 #ifdef SCTP_AUDITING_ENABLED
9296                         sctp_audit_log(0xC4, bundle_at);
9297 #endif
9298                         if (bundle_at) {
9299                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9300                         }
9301                         for (i = 0; i < bundle_at; i++) {
9302                                 SCTP_STAT_INCR(sctps_sendretransdata);
9303                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9304                                 /*
9305                                  * When we have a revoked data, and we
9306                                  * retransmit it, then we clear the revoked
9307                                  * flag since this flag dictates if we
9308                                  * subtracted from the fs
9309                                  */
9310                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9311                                         /* Deflate the cwnd */
9312                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9313                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9314                                 }
9315                                 data_list[i]->snd_count++;
9316                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9317                                 /* record the time */
9318                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9319                                 if (data_list[i]->book_size_scale) {
9320                                         /*
9321                                          * need to double the book size on
9322                                          * this one
9323                                          */
9324                                         data_list[i]->book_size_scale = 0;
9325                                         /*
9326                                          * Since we double the booksize, we
9327                                          * must also double the output queue
9328                                          * size, since this get shrunk when
9329                                          * we free by this amount.
9330                                          */
9331                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9332                                         data_list[i]->book_size *= 2;
9333
9334
9335                                 } else {
9336                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9337                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9338                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9339                                         }
9340                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9341                                             (uint32_t) (data_list[i]->send_size +
9342                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9343                                 }
9344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9345                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9346                                             data_list[i]->whoTo->flight_size,
9347                                             data_list[i]->book_size,
9348                                             (uintptr_t) data_list[i]->whoTo,
9349                                             data_list[i]->rec.data.TSN_seq);
9350                                 }
9351                                 sctp_flight_size_increase(data_list[i]);
9352                                 sctp_total_flight_increase(stcb, data_list[i]);
9353                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9354                                         /* SWS sender side engages */
9355                                         asoc->peers_rwnd = 0;
9356                                 }
9357                                 if ((i == 0) &&
9358                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9359                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9360                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9361                                             (tmr_started == 0)) {
9362                                                 /*-
9363                                                  * ok we just fast-retrans'd
9364                                                  * the lowest TSN, i.e the
9365                                                  * first on the list. In
9366                                                  * this case we want to give
9367                                                  * some more time to get a
9368                                                  * SACK back without a
9369                                                  * t3-expiring.
9370                                                  */
9371                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9372                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9373                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9374                                         }
9375                                 }
9376                         }
9377                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9378                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9379                         }
9380 #ifdef SCTP_AUDITING_ENABLED
9381                         sctp_auditing(21, inp, stcb, NULL);
9382 #endif
9383                 } else {
9384                         /* None will fit */
9385                         return (1);
9386                 }
9387                 if (asoc->sent_queue_retran_cnt <= 0) {
9388                         /* all done we have no more to retran */
9389                         asoc->sent_queue_retran_cnt = 0;
9390                         break;
9391                 }
9392                 if (one_chunk) {
9393                         /* No more room in rwnd */
9394                         return (1);
9395                 }
9396                 /* stop the for loop here. we sent out a packet */
9397                 break;
9398         }
9399         return (0);
9400 }
9401
9402
9403 static int
9404 sctp_timer_validation(struct sctp_inpcb *inp,
9405     struct sctp_tcb *stcb,
9406     struct sctp_association *asoc,
9407     int ret)
9408 {
9409         struct sctp_nets *net;
9410
9411         /* Validate that a timer is running somewhere */
9412         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9413                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9414                         /* Here is a timer */
9415                         return (ret);
9416                 }
9417         }
9418         SCTP_TCB_LOCK_ASSERT(stcb);
9419         /* Gak, we did not have a timer somewhere */
9420         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9421         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9422         return (ret);
9423 }
9424
9425 void
9426 sctp_chunk_output(struct sctp_inpcb *inp,
9427     struct sctp_tcb *stcb,
9428     int from_where,
9429     int so_locked
9430 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9431     SCTP_UNUSED
9432 #endif
9433 )
9434 {
9435         /*-
9436          * Ok this is the generic chunk service queue. we must do the
9437          * following:
9438          * - See if there are retransmits pending, if so we must
9439          *   do these first.
9440          * - Service the stream queue that is next, moving any
9441          *   message (note I must get a complete message i.e.
9442          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9443          *   TSN's
9444          * - Check to see if the cwnd/rwnd allows any output, if so we
9445          *   go ahead and fomulate and send the low level chunks. Making sure
9446          *   to combine any control in the control chunk queue also.
9447          */
9448         struct sctp_association *asoc;
9449         struct sctp_nets *net;
9450         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9451             burst_cnt = 0, burst_limit = 0;
9452         struct timeval now;
9453         int now_filled = 0;
9454         int nagle_on = 0;
9455         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9456         int un_sent = 0;
9457         int fr_done, tot_frs = 0;
9458
9459         asoc = &stcb->asoc;
9460         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9461                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9462                         nagle_on = 0;
9463                 } else {
9464                         nagle_on = 1;
9465                 }
9466         }
9467         SCTP_TCB_LOCK_ASSERT(stcb);
9468
9469         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9470
9471         if ((un_sent <= 0) &&
9472             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9473             (asoc->sent_queue_retran_cnt == 0)) {
9474                 /* Nothing to do unless there is something to be sent left */
9475                 return;
9476         }
9477         /*
9478          * Do we have something to send, data or control AND a sack timer
9479          * running, if so piggy-back the sack.
9480          */
9481         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9482                 /*
9483                  * EY if nr_sacks used then send an nr-sack , a sack
9484                  * otherwise
9485                  */
9486                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack)
9487                         sctp_send_nr_sack(stcb);
9488                 else
9489                         sctp_send_sack(stcb);
9490                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9491         }
9492         while (asoc->sent_queue_retran_cnt) {
9493                 /*-
9494                  * Ok, it is retransmission time only, we send out only ONE
9495                  * packet with a single call off to the retran code.
9496                  */
9497                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9498                         /*-
9499                          * Special hook for handling cookiess discarded
9500                          * by peer that carried data. Send cookie-ack only
9501                          * and then the next call with get the retran's.
9502                          */
9503                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9504                             from_where,
9505                             &now, &now_filled, frag_point, so_locked);
9506                         return;
9507                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9508                         /* if its not from a HB then do it */
9509                         fr_done = 0;
9510                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9511                         if (fr_done) {
9512                                 tot_frs++;
9513                         }
9514                 } else {
9515                         /*
9516                          * its from any other place, we don't allow retran
9517                          * output (only control)
9518                          */
9519                         ret = 1;
9520                 }
9521                 if (ret > 0) {
9522                         /* Can't send anymore */
9523                         /*-
9524                          * now lets push out control by calling med-level
9525                          * output once. this assures that we WILL send HB's
9526                          * if queued too.
9527                          */
9528                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9529                             from_where,
9530                             &now, &now_filled, frag_point, so_locked);
9531 #ifdef SCTP_AUDITING_ENABLED
9532                         sctp_auditing(8, inp, stcb, NULL);
9533 #endif
9534                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9535                         return;
9536                 }
9537                 if (ret < 0) {
9538                         /*-
9539                          * The count was off.. retran is not happening so do
9540                          * the normal retransmission.
9541                          */
9542 #ifdef SCTP_AUDITING_ENABLED
9543                         sctp_auditing(9, inp, stcb, NULL);
9544 #endif
9545                         if (ret == SCTP_RETRAN_EXIT) {
9546                                 return;
9547                         }
9548                         break;
9549                 }
9550                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9551                         /* Only one transmission allowed out of a timeout */
9552 #ifdef SCTP_AUDITING_ENABLED
9553                         sctp_auditing(10, inp, stcb, NULL);
9554 #endif
9555                         /* Push out any control */
9556                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9557                             &now, &now_filled, frag_point, so_locked);
9558                         return;
9559                 }
9560                 if (tot_frs > asoc->max_burst) {
9561                         /* Hit FR burst limit */
9562                         return;
9563                 }
9564                 if ((num_out == 0) && (ret == 0)) {
9565
9566                         /* No more retrans to send */
9567                         break;
9568                 }
9569         }
9570 #ifdef SCTP_AUDITING_ENABLED
9571         sctp_auditing(12, inp, stcb, NULL);
9572 #endif
9573         /* Check for bad destinations, if they exist move chunks around. */
9574         burst_limit = asoc->max_burst;
9575         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9576                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9577                     SCTP_ADDR_NOT_REACHABLE) {
9578                         /*-
9579                          * if possible move things off of this address we
9580                          * still may send below due to the dormant state but
9581                          * we try to find an alternate address to send to
9582                          * and if we have one we move all queued data on the
9583                          * out wheel to this alternate address.
9584                          */
9585                         if (net->ref_count > 1)
9586                                 sctp_move_to_an_alt(stcb, asoc, net);
9587                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9588                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9589                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9590                         /*
9591                          * JRS 5/14/07 - If CMT PF is on and the current
9592                          * destination is in PF state, move all queued data
9593                          * to an alternate desination.
9594                          */
9595                         if (net->ref_count > 1)
9596                                 sctp_move_to_an_alt(stcb, asoc, net);
9597                 } else {
9598                         /*-
9599                          * if ((asoc->sat_network) || (net->addr_is_local))
9600                          * { burst_limit = asoc->max_burst *
9601                          * SCTP_SAT_NETWORK_BURST_INCR; }
9602                          */
9603                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9604                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9605                                         /*
9606                                          * JRS - Use the congestion control
9607                                          * given in the congestion control
9608                                          * module
9609                                          */
9610                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9611                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9612                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9613                                         }
9614                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9615                                 }
9616                                 net->fast_retran_ip = 0;
9617                         } else {
9618                                 if (net->flight_size == 0) {
9619                                         /* Should be decaying the cwnd here */
9620                                         ;
9621                                 }
9622                         }
9623                 }
9624
9625         }
9626         burst_cnt = 0;
9627         do {
9628                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9629                     &reason_code, 0, from_where,
9630                     &now, &now_filled, frag_point, so_locked);
9631                 if (error) {
9632                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9633                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9634                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9635                         }
9636                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9637                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9638                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9639                         }
9640                         break;
9641                 }
9642                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9643
9644                 tot_out += num_out;
9645                 burst_cnt++;
9646                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9647                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9648                         if (num_out == 0) {
9649                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9650                         }
9651                 }
9652                 if (nagle_on) {
9653                         /*-
9654                          * When nagle is on, we look at how much is un_sent, then
9655                          * if its smaller than an MTU and we have data in
9656                          * flight we stop.
9657                          */
9658                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9659                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9660                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9661                             (stcb->asoc.total_flight > 0)) {
9662                                 break;
9663                         }
9664                 }
9665                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9666                     TAILQ_EMPTY(&asoc->send_queue) &&
9667                     TAILQ_EMPTY(&asoc->out_wheel)) {
9668                         /* Nothing left to send */
9669                         break;
9670                 }
9671                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9672                         /* Nothing left to send */
9673                         break;
9674                 }
9675         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9676             (burst_cnt < burst_limit)));
9677
9678         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9679                 if (burst_cnt >= burst_limit) {
9680                         SCTP_STAT_INCR(sctps_maxburstqueued);
9681                         asoc->burst_limit_applied = 1;
9682                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9683                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9684                         }
9685                 } else {
9686                         asoc->burst_limit_applied = 0;
9687                 }
9688         }
9689         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9690                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9691         }
9692         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9693             tot_out);
9694
9695         /*-
9696          * Now we need to clean up the control chunk chain if a ECNE is on
9697          * it. It must be marked as UNSENT again so next call will continue
9698          * to send it until such time that we get a CWR, to remove it.
9699          */
9700         if (stcb->asoc.ecn_echo_cnt_onq)
9701                 sctp_fix_ecn_echo(asoc);
9702         return;
9703 }
9704
9705
9706 int
9707 sctp_output(inp, m, addr, control, p, flags)
9708         struct sctp_inpcb *inp;
9709         struct mbuf *m;
9710         struct sockaddr *addr;
9711         struct mbuf *control;
9712         struct thread *p;
9713         int flags;
9714 {
9715         if (inp == NULL) {
9716                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9717                 return (EINVAL);
9718         }
9719         if (inp->sctp_socket == NULL) {
9720                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9721                 return (EINVAL);
9722         }
9723         return (sctp_sosend(inp->sctp_socket,
9724             addr,
9725             (struct uio *)NULL,
9726             m,
9727             control,
9728             flags, p
9729             ));
9730 }
9731
9732 void
9733 send_forward_tsn(struct sctp_tcb *stcb,
9734     struct sctp_association *asoc)
9735 {
9736         struct sctp_tmit_chunk *chk;
9737         struct sctp_forward_tsn_chunk *fwdtsn;
9738         uint32_t advance_peer_ack_point;
9739
9740         SCTP_TCB_LOCK_ASSERT(stcb);
9741         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9742                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9743                         /* mark it to unsent */
9744                         chk->sent = SCTP_DATAGRAM_UNSENT;
9745                         chk->snd_count = 0;
9746                         /* Do we correct its output location? */
9747                         if (chk->whoTo != asoc->primary_destination) {
9748                                 sctp_free_remote_addr(chk->whoTo);
9749                                 chk->whoTo = asoc->primary_destination;
9750                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9751                         }
9752                         goto sctp_fill_in_rest;
9753                 }
9754         }
9755         /* Ok if we reach here we must build one */
9756         sctp_alloc_a_chunk(stcb, chk);
9757         if (chk == NULL) {
9758                 return;
9759         }
9760         chk->copy_by_ref = 0;
9761         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9762         chk->rec.chunk_id.can_take_data = 0;
9763         chk->asoc = asoc;
9764         chk->whoTo = NULL;
9765
9766         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9767         if (chk->data == NULL) {
9768                 sctp_free_a_chunk(stcb, chk);
9769                 return;
9770         }
9771         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9772         chk->sent = SCTP_DATAGRAM_UNSENT;
9773         chk->snd_count = 0;
9774         chk->whoTo = asoc->primary_destination;
9775         atomic_add_int(&chk->whoTo->ref_count, 1);
9776         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9777         asoc->ctrl_queue_cnt++;
9778 sctp_fill_in_rest:
9779         /*-
9780          * Here we go through and fill out the part that deals with
9781          * stream/seq of the ones we skip.
9782          */
9783         SCTP_BUF_LEN(chk->data) = 0;
9784         {
9785                 struct sctp_tmit_chunk *at, *tp1, *last;
9786                 struct sctp_strseq *strseq;
9787                 unsigned int cnt_of_space, i, ovh;
9788                 unsigned int space_needed;
9789                 unsigned int cnt_of_skipped = 0;
9790
9791                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9792                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9793                                 /* no more to look at */
9794                                 break;
9795                         }
9796                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9797                                 /* We don't report these */
9798                                 continue;
9799                         }
9800                         cnt_of_skipped++;
9801                 }
9802                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9803                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9804
9805                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9806
9807                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9808                         ovh = SCTP_MIN_OVERHEAD;
9809                 } else {
9810                         ovh = SCTP_MIN_V4_OVERHEAD;
9811                 }
9812                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9813                         /* trim to a mtu size */
9814                         cnt_of_space = asoc->smallest_mtu - ovh;
9815                 }
9816                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9817                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9818                             0xff, 0, cnt_of_skipped,
9819                             asoc->advanced_peer_ack_point);
9820
9821                 }
9822                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9823                 if (cnt_of_space < space_needed) {
9824                         /*-
9825                          * ok we must trim down the chunk by lowering the
9826                          * advance peer ack point.
9827                          */
9828                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9829                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9830                                     0xff, 0xff, cnt_of_space,
9831                                     space_needed);
9832                         }
9833                         cnt_of_skipped = (cnt_of_space -
9834                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9835                             sizeof(struct sctp_strseq)));
9836                         /*-
9837                          * Go through and find the TSN that will be the one
9838                          * we report.
9839                          */
9840                         at = TAILQ_FIRST(&asoc->sent_queue);
9841                         for (i = 0; i < cnt_of_skipped; i++) {
9842                                 tp1 = TAILQ_NEXT(at, sctp_next);
9843                                 at = tp1;
9844                         }
9845                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9846                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9847                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9848                                     asoc->advanced_peer_ack_point);
9849                         }
9850                         last = at;
9851                         /*-
9852                          * last now points to last one I can report, update
9853                          * peer ack point
9854                          */
9855                         advance_peer_ack_point = last->rec.data.TSN_seq;
9856                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9857                 }
9858                 chk->send_size = space_needed;
9859                 /* Setup the chunk */
9860                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9861                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9862                 fwdtsn->ch.chunk_flags = 0;
9863                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9864                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9865                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9866                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9867                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9868                 fwdtsn++;
9869                 /*-
9870                  * Move pointer to after the fwdtsn and transfer to the
9871                  * strseq pointer.
9872                  */
9873                 strseq = (struct sctp_strseq *)fwdtsn;
9874                 /*-
9875                  * Now populate the strseq list. This is done blindly
9876                  * without pulling out duplicate stream info. This is
9877                  * inefficent but won't harm the process since the peer will
9878                  * look at these in sequence and will thus release anything.
9879                  * It could mean we exceed the PMTU and chop off some that
9880                  * we could have included.. but this is unlikely (aka 1432/4
9881                  * would mean 300+ stream seq's would have to be reported in
9882                  * one FWD-TSN. With a bit of work we can later FIX this to
9883                  * optimize and pull out duplcates.. but it does add more
9884                  * overhead. So for now... not!
9885                  */
9886                 at = TAILQ_FIRST(&asoc->sent_queue);
9887                 for (i = 0; i < cnt_of_skipped; i++) {
9888                         tp1 = TAILQ_NEXT(at, sctp_next);
9889                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9890                                 /* We don't report these */
9891                                 i--;
9892                                 at = tp1;
9893                                 continue;
9894                         }
9895                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9896                                 at->rec.data.fwd_tsn_cnt = 0;
9897                         }
9898                         strseq->stream = ntohs(at->rec.data.stream_number);
9899                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9900                         strseq++;
9901                         at = tp1;
9902                 }
9903         }
9904         return;
9905
9906 }
9907
9908 void
9909 sctp_send_sack(struct sctp_tcb *stcb)
9910 {
9911         /*-
9912          * Queue up a SACK in the control queue. We must first check to see
9913          * if a SACK is somehow on the control queue. If so, we will take
9914          * and and remove the old one.
9915          */
9916         struct sctp_association *asoc;
9917         struct sctp_tmit_chunk *chk, *a_chk;
9918         struct sctp_sack_chunk *sack;
9919         struct sctp_gap_ack_block *gap_descriptor;
9920         struct sack_track *selector;
9921         int mergeable = 0;
9922         int offset;
9923         caddr_t limit;
9924         uint32_t *dup;
9925         int limit_reached = 0;
9926         unsigned int i, jstart, siz, j;
9927         unsigned int num_gap_blocks = 0, space;
9928         int num_dups = 0;
9929         int space_req;
9930
9931         a_chk = NULL;
9932         asoc = &stcb->asoc;
9933         SCTP_TCB_LOCK_ASSERT(stcb);
9934         if (asoc->last_data_chunk_from == NULL) {
9935                 /* Hmm we never received anything */
9936                 return;
9937         }
9938         sctp_set_rwnd(stcb, asoc);
9939         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9940                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9941                         /* Hmm, found a sack already on queue, remove it */
9942                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9943                         asoc->ctrl_queue_cnt++;
9944                         a_chk = chk;
9945                         if (a_chk->data) {
9946                                 sctp_m_freem(a_chk->data);
9947                                 a_chk->data = NULL;
9948                         }
9949                         sctp_free_remote_addr(a_chk->whoTo);
9950                         a_chk->whoTo = NULL;
9951                         break;
9952                 }
9953         }
9954         if (a_chk == NULL) {
9955                 sctp_alloc_a_chunk(stcb, a_chk);
9956                 if (a_chk == NULL) {
9957                         /* No memory so we drop the idea, and set a timer */
9958                         if (stcb->asoc.delayed_ack) {
9959                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9960                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9961                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9962                                     stcb->sctp_ep, stcb, NULL);
9963                         } else {
9964                                 stcb->asoc.send_sack = 1;
9965                         }
9966                         return;
9967                 }
9968                 a_chk->copy_by_ref = 0;
9969                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9970                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9971                 a_chk->rec.chunk_id.can_take_data = 1;
9972         }
9973         /* Clear our pkt counts */
9974         asoc->data_pkts_seen = 0;
9975
9976         a_chk->asoc = asoc;
9977         a_chk->snd_count = 0;
9978         a_chk->send_size = 0;   /* fill in later */
9979         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9980         a_chk->whoTo = NULL;
9981
9982         if ((asoc->numduptsns) ||
9983             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9984             ) {
9985                 /*-
9986                  * Ok, we have some duplicates or the destination for the
9987                  * sack is unreachable, lets see if we can select an
9988                  * alternate than asoc->last_data_chunk_from
9989                  */
9990                 if ((!(asoc->last_data_chunk_from->dest_state &
9991                     SCTP_ADDR_NOT_REACHABLE)) &&
9992                     (asoc->used_alt_onsack > asoc->numnets)) {
9993                         /* We used an alt last time, don't this time */
9994                         a_chk->whoTo = NULL;
9995                 } else {
9996                         asoc->used_alt_onsack++;
9997                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9998                 }
9999                 if (a_chk->whoTo == NULL) {
10000                         /* Nope, no alternate */
10001                         a_chk->whoTo = asoc->last_data_chunk_from;
10002                         asoc->used_alt_onsack = 0;
10003                 }
10004         } else {
10005                 /*
10006                  * No duplicates so we use the last place we received data
10007                  * from.
10008                  */
10009                 asoc->used_alt_onsack = 0;
10010                 a_chk->whoTo = asoc->last_data_chunk_from;
10011         }
10012         if (a_chk->whoTo) {
10013                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10014         }
10015         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10016                 /* no gaps */
10017                 space_req = sizeof(struct sctp_sack_chunk);
10018         } else {
10019                 /* gaps get a cluster */
10020                 space_req = MCLBYTES;
10021         }
10022         /* Ok now lets formulate a MBUF with our sack */
10023         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10024         if ((a_chk->data == NULL) ||
10025             (a_chk->whoTo == NULL)) {
10026                 /* rats, no mbuf memory */
10027                 if (a_chk->data) {
10028                         /* was a problem with the destination */
10029                         sctp_m_freem(a_chk->data);
10030                         a_chk->data = NULL;
10031                 }
10032                 sctp_free_a_chunk(stcb, a_chk);
10033                 /* sa_ignore NO_NULL_CHK */
10034                 if (stcb->asoc.delayed_ack) {
10035                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10036                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10037                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10038                             stcb->sctp_ep, stcb, NULL);
10039                 } else {
10040                         stcb->asoc.send_sack = 1;
10041                 }
10042                 return;
10043         }
10044         /* ok, lets go through and fill it in */
10045         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10046         space = M_TRAILINGSPACE(a_chk->data);
10047         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10048                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10049         }
10050         limit = mtod(a_chk->data, caddr_t);
10051         limit += space;
10052
10053         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10054         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
10055         /* 0x01 is used by nonce for ecn */
10056         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10057             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10058             (asoc->peer_supports_ecn_nonce))
10059                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10060         else
10061                 sack->ch.chunk_flags = 0;
10062
10063         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10064                 /*-
10065                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10066                  * received, then set high bit to 1, else 0. Reset
10067                  * pkts_rcvd.
10068                  */
10069                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10070                 asoc->cmt_dac_pkts_rcvd = 0;
10071         }
10072 #ifdef SCTP_ASOCLOG_OF_TSNS
10073         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10074         stcb->asoc.cumack_log_atsnt++;
10075         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10076                 stcb->asoc.cumack_log_atsnt = 0;
10077         }
10078 #endif
10079         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10080         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10081         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10082
10083         /* reset the readers interpretation */
10084         stcb->freed_by_sorcv_sincelast = 0;
10085
10086         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10087
10088         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10089                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10090         else
10091                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10092
10093         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10094                 offset = 1;
10095                 /*-
10096                  * cum-ack behind the mapping array, so we start and use all
10097                  * entries.
10098                  */
10099                 jstart = 0;
10100         } else {
10101                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10102                 /*-
10103                  * we skip the first one when the cum-ack is at or above the
10104                  * mapping array base. Note this only works if
10105                  */
10106                 jstart = 1;
10107         }
10108         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10109                 /* we have a gap .. maybe */
10110                 for (i = 0; i < siz; i++) {
10111                         selector = &sack_array[asoc->mapping_array[i]];
10112                         if (mergeable && selector->right_edge) {
10113                                 /*
10114                                  * Backup, left and right edges were ok to
10115                                  * merge.
10116                                  */
10117                                 num_gap_blocks--;
10118                                 gap_descriptor--;
10119                         }
10120                         if (selector->num_entries == 0)
10121                                 mergeable = 0;
10122                         else {
10123                                 for (j = jstart; j < selector->num_entries; j++) {
10124                                         if (mergeable && selector->right_edge) {
10125                                                 /*
10126                                                  * do a merge by NOT setting
10127                                                  * the left side
10128                                                  */
10129                                                 mergeable = 0;
10130                                         } else {
10131                                                 /*
10132                                                  * no merge, set the left
10133                                                  * side
10134                                                  */
10135                                                 mergeable = 0;
10136                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10137                                         }
10138                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10139                                         num_gap_blocks++;
10140                                         gap_descriptor++;
10141                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10142                                                 /* no more room */
10143                                                 limit_reached = 1;
10144                                                 break;
10145                                         }
10146                                 }
10147                                 if (selector->left_edge) {
10148                                         mergeable = 1;
10149                                 }
10150                         }
10151                         if (limit_reached) {
10152                                 /* Reached the limit stop */
10153                                 break;
10154                         }
10155                         jstart = 0;
10156                         offset += 8;
10157                 }
10158                 if (num_gap_blocks == 0) {
10159                         /*
10160                          * slide not yet happened, and somehow we got called
10161                          * to send a sack. Cumack needs to move up.
10162                          */
10163                         int abort_flag = 0;
10164
10165                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10166                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10167                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10168                 }
10169         }
10170         /* now we must add any dups we are going to report. */
10171         if ((limit_reached == 0) && (asoc->numduptsns)) {
10172                 dup = (uint32_t *) gap_descriptor;
10173                 for (i = 0; i < asoc->numduptsns; i++) {
10174                         *dup = htonl(asoc->dup_tsns[i]);
10175                         dup++;
10176                         num_dups++;
10177                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10178                                 /* no more room */
10179                                 break;
10180                         }
10181                 }
10182                 asoc->numduptsns = 0;
10183         }
10184         /*
10185          * now that the chunk is prepared queue it to the control chunk
10186          * queue.
10187          */
10188         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10189             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10190             (num_dups * sizeof(int32_t)));
10191         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10192         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10193         sack->sack.num_dup_tsns = htons(num_dups);
10194         sack->ch.chunk_length = htons(a_chk->send_size);
10195         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10196         asoc->ctrl_queue_cnt++;
10197         asoc->send_sack = 0;
10198         SCTP_STAT_INCR(sctps_sendsacks);
10199         return;
10200 }
10201
10202 /* EY - This method will replace sctp_send_sack method if nr_sacks negotiated*/
10203 void
10204 sctp_send_nr_sack(struct sctp_tcb *stcb)
10205 {
10206         /*-
10207          * Queue up an NR-SACK in the control queue. We must first check to see
10208          * if an NR-SACK is somehow on the control queue. If so, we will take
10209          * and and remove the old one.
10210          */
10211         struct sctp_association *asoc;
10212         struct sctp_tmit_chunk *chk, *a_chk;
10213
10214         struct sctp_nr_sack_chunk *nr_sack;
10215
10216         struct sctp_gap_ack_block *gap_descriptor;
10217         struct sctp_nr_gap_ack_block *nr_gap_descriptor;
10218
10219         struct sack_track *selector;
10220         struct sack_track *nr_selector;
10221
10222         /* EY do we need nr_mergeable, NO */
10223         int mergeable = 0;
10224         int offset;
10225         caddr_t limit;
10226         uint32_t *dup;
10227         int limit_reached = 0;
10228         unsigned int i, jstart, siz, j;
10229         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10230         int num_dups = 0;
10231         int space_req;
10232         unsigned int reserved = 0;
10233
10234         a_chk = NULL;
10235         asoc = &stcb->asoc;
10236         SCTP_TCB_LOCK_ASSERT(stcb);
10237         if (asoc->last_data_chunk_from == NULL) {
10238                 /* Hmm we never received anything */
10239                 return;
10240         }
10241         sctp_set_rwnd(stcb, asoc);
10242         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10243                 if (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) {
10244                         /* Hmm, found a sack already on queue, remove it */
10245                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10246                         asoc->ctrl_queue_cnt++;
10247                         a_chk = chk;
10248                         if (a_chk->data) {
10249                                 sctp_m_freem(a_chk->data);
10250                                 a_chk->data = NULL;
10251                         }
10252                         sctp_free_remote_addr(a_chk->whoTo);
10253                         a_chk->whoTo = NULL;
10254                         break;
10255                 }
10256         }
10257         if (a_chk == NULL) {
10258                 sctp_alloc_a_chunk(stcb, a_chk);
10259                 if (a_chk == NULL) {
10260                         /* No memory so we drop the idea, and set a timer */
10261                         if (stcb->asoc.delayed_ack) {
10262                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10263                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10264                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10265                                     stcb->sctp_ep, stcb, NULL);
10266                         } else {
10267                                 stcb->asoc.send_sack = 1;
10268                         }
10269                         return;
10270                 }
10271                 a_chk->copy_by_ref = 0;
10272                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
10273                 a_chk->rec.chunk_id.id = SCTP_NR_SELECTIVE_ACK;
10274                 a_chk->rec.chunk_id.can_take_data = 1;
10275         }
10276         /* Clear our pkt counts */
10277         asoc->data_pkts_seen = 0;
10278
10279         a_chk->asoc = asoc;
10280         a_chk->snd_count = 0;
10281         a_chk->send_size = 0;   /* fill in later */
10282         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10283         a_chk->whoTo = NULL;
10284
10285         if ((asoc->numduptsns) ||
10286             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
10287             ) {
10288                 /*-
10289                  * Ok, we have some duplicates or the destination for the
10290                  * sack is unreachable, lets see if we can select an
10291                  * alternate than asoc->last_data_chunk_from
10292                  */
10293                 if ((!(asoc->last_data_chunk_from->dest_state &
10294                     SCTP_ADDR_NOT_REACHABLE)) &&
10295                     (asoc->used_alt_onsack > asoc->numnets)) {
10296                         /* We used an alt last time, don't this time */
10297                         a_chk->whoTo = NULL;
10298                 } else {
10299                         asoc->used_alt_onsack++;
10300                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10301                 }
10302                 if (a_chk->whoTo == NULL) {
10303                         /* Nope, no alternate */
10304                         a_chk->whoTo = asoc->last_data_chunk_from;
10305                         asoc->used_alt_onsack = 0;
10306                 }
10307         } else {
10308                 /*
10309                  * No duplicates so we use the last place we received data
10310                  * from.
10311                  */
10312                 asoc->used_alt_onsack = 0;
10313                 a_chk->whoTo = asoc->last_data_chunk_from;
10314         }
10315         if (a_chk->whoTo) {
10316                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10317         }
10318         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10319                 /* no gaps */
10320                 space_req = sizeof(struct sctp_nr_sack_chunk);
10321         } else {
10322                 /* EY - what is this about? */
10323                 /* gaps get a cluster */
10324                 space_req = MCLBYTES;
10325         }
10326         /* Ok now lets formulate a MBUF with our sack */
10327         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10328         if ((a_chk->data == NULL) ||
10329             (a_chk->whoTo == NULL)) {
10330                 /* rats, no mbuf memory */
10331                 if (a_chk->data) {
10332                         /* was a problem with the destination */
10333                         sctp_m_freem(a_chk->data);
10334                         a_chk->data = NULL;
10335                 }
10336                 sctp_free_a_chunk(stcb, a_chk);
10337                 /* sa_ignore NO_NULL_CHK */
10338                 if (stcb->asoc.delayed_ack) {
10339                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10340                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10341                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10342                             stcb->sctp_ep, stcb, NULL);
10343                 } else {
10344                         stcb->asoc.send_sack = 1;
10345                 }
10346                 return;
10347         }
10348         /* ok, lets go through and fill it in */
10349         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10350         space = M_TRAILINGSPACE(a_chk->data);
10351         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10352                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10353         }
10354         limit = mtod(a_chk->data, caddr_t);
10355         limit += space;
10356
10357         nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10358         nr_sack->ch.chunk_type = SCTP_NR_SELECTIVE_ACK;
10359         /* EYJ */
10360         /* 0x01 is used by nonce for ecn */
10361         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10362             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10363             (asoc->peer_supports_ecn_nonce))
10364                 nr_sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10365         else
10366                 nr_sack->ch.chunk_flags = 0;
10367
10368         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10369                 /*-
10370                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10371                  * received, then set high bit to 1, else 0. Reset
10372                  * pkts_rcvd.
10373                  */
10374                 /* EY - TODO: which chunk flag is used in here? -The LSB */
10375                 nr_sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10376                 asoc->cmt_dac_pkts_rcvd = 0;
10377         }
10378 #ifdef SCTP_ASOCLOG_OF_TSNS
10379         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10380         stcb->asoc.cumack_log_atsnt++;
10381         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10382                 stcb->asoc.cumack_log_atsnt = 0;
10383         }
10384 #endif
10385         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10386         nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10387         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10388
10389         /* reset the readers interpretation */
10390         stcb->freed_by_sorcv_sincelast = 0;
10391
10392         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10393
10394         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10395                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10396         else
10397                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10398
10399         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10400                 offset = 1;
10401                 /*-
10402                  * cum-ack behind the mapping array, so we start and use all
10403                  * entries.
10404                  */
10405                 jstart = 0;
10406         } else {
10407                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10408                 /*-
10409                  * we skip the first one when the cum-ack is at or above the
10410                  * mapping array base. Note this only works if
10411                  */
10412                 jstart = 1;
10413         }
10414         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10415                 /* we have a gap .. maybe */
10416                 for (i = 0; i < siz; i++) {
10417                         selector = &sack_array[asoc->mapping_array[i]];
10418                         if (mergeable && selector->right_edge) {
10419                                 /*
10420                                  * Backup, left and right edges were ok to
10421                                  * merge.
10422                                  */
10423                                 num_gap_blocks--;
10424                                 gap_descriptor--;
10425                         }
10426                         if (selector->num_entries == 0)
10427                                 mergeable = 0;
10428                         else {
10429                                 for (j = jstart; j < selector->num_entries; j++) {
10430                                         if (mergeable && selector->right_edge) {
10431                                                 /*
10432                                                  * do a merge by NOT setting
10433                                                  * the left side
10434                                                  */
10435                                                 mergeable = 0;
10436                                         } else {
10437                                                 /*
10438                                                  * no merge, set the left
10439                                                  * side
10440                                                  */
10441                                                 mergeable = 0;
10442                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10443                                         }
10444                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10445                                         num_gap_blocks++;
10446                                         gap_descriptor++;
10447                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10448                                                 /* no more room */
10449                                                 limit_reached = 1;
10450                                                 break;
10451                                         }
10452                                 }
10453                                 if (selector->left_edge) {
10454                                         mergeable = 1;
10455                                 }
10456                         }
10457                         if (limit_reached) {
10458                                 /* Reached the limit stop */
10459                                 break;
10460                         }
10461                         jstart = 0;
10462                         offset += 8;
10463                 }
10464                 if (num_gap_blocks == 0) {
10465                         /*
10466                          * slide not yet happened, and somehow we got called
10467                          * to send a sack. Cumack needs to move up.
10468                          */
10469                         int abort_flag = 0;
10470
10471                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10472                         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10473                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10474                 }
10475         }
10476         /*---------------------------------------------------------filling the nr_gap_ack blocks----------------------------------------------------*/
10477
10478         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)gap_descriptor;
10479
10480         /* EY - there will be gaps + nr_gaps if draining is possible */
10481         if ((SCTP_BASE_SYSCTL(sctp_do_drain)) && (limit_reached == 0)) {
10482
10483                 mergeable = 0;
10484
10485                 if (asoc->highest_tsn_inside_nr_map > asoc->nr_mapping_array_base_tsn)
10486                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn) + 1) + 7) / 8;
10487                 else
10488                         siz = (((MAX_TSN - asoc->nr_mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10489
10490                 if (compare_with_wrap(asoc->nr_mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10491                         offset = 1;
10492                         /*-
10493                         * cum-ack behind the mapping array, so we start and use all
10494                         * entries.
10495                         */
10496                         jstart = 0;
10497                 } else {
10498                         offset = asoc->nr_mapping_array_base_tsn - asoc->cumulative_tsn;
10499                         /*-
10500                         * we skip the first one when the cum-ack is at or above the
10501                         * mapping array base. Note this only works if
10502                         */
10503                         jstart = 1;
10504                 }
10505                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10506                         /* we have a gap .. maybe */
10507                         for (i = 0; i < siz; i++) {
10508                                 nr_selector = &sack_array[asoc->nr_mapping_array[i]];
10509                                 if (mergeable && nr_selector->right_edge) {
10510                                         /*
10511                                          * Backup, left and right edges were
10512                                          * ok to merge.
10513                                          */
10514                                         num_nr_gap_blocks--;
10515                                         nr_gap_descriptor--;
10516                                 }
10517                                 if (nr_selector->num_entries == 0)
10518                                         mergeable = 0;
10519                                 else {
10520                                         for (j = jstart; j < nr_selector->num_entries; j++) {
10521                                                 if (mergeable && nr_selector->right_edge) {
10522                                                         /*
10523                                                          * do a merge by NOT
10524                                                          * setting the left
10525                                                          * side
10526                                                          */
10527                                                         mergeable = 0;
10528                                                 } else {
10529                                                         /*
10530                                                          * no merge, set the
10531                                                          * left side
10532                                                          */
10533                                                         mergeable = 0;
10534                                                         nr_gap_descriptor->start = htons((nr_selector->gaps[j].start + offset));
10535                                                 }
10536                                                 nr_gap_descriptor->end = htons((nr_selector->gaps[j].end + offset));
10537                                                 num_nr_gap_blocks++;
10538                                                 nr_gap_descriptor++;
10539                                                 if (((caddr_t)nr_gap_descriptor + sizeof(struct sctp_nr_gap_ack_block)) > limit) {
10540                                                         /* no more room */
10541                                                         limit_reached = 1;
10542                                                         break;
10543                                                 }
10544                                         }
10545                                         if (nr_selector->left_edge) {
10546                                                 mergeable = 1;
10547                                         }
10548                                 }
10549                                 if (limit_reached) {
10550                                         /* Reached the limit stop */
10551                                         break;
10552                                 }
10553                                 jstart = 0;
10554                                 offset += 8;
10555                         }
10556                 }
10557         }
10558         /*---------------------------------------------End of---filling the nr_gap_ack blocks----------------------------------------------------*/
10559
10560         /* now we must add any dups we are going to report. */
10561         if ((limit_reached == 0) && (asoc->numduptsns)) {
10562                 dup = (uint32_t *) nr_gap_descriptor;
10563                 for (i = 0; i < asoc->numduptsns; i++) {
10564                         *dup = htonl(asoc->dup_tsns[i]);
10565                         dup++;
10566                         num_dups++;
10567                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10568                                 /* no more room */
10569                                 break;
10570                         }
10571                 }
10572                 asoc->numduptsns = 0;
10573         }
10574         /*
10575          * now that the chunk is prepared queue it to the control chunk
10576          * queue.
10577          */
10578         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
10579                 num_nr_gap_blocks = num_gap_blocks;
10580                 num_gap_blocks = 0;
10581         }
10582         a_chk->send_size = (sizeof(struct sctp_nr_sack_chunk) +
10583             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10584             (num_nr_gap_blocks * sizeof(struct sctp_nr_gap_ack_block)) +
10585             (num_dups * sizeof(int32_t)));
10586
10587         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10588         nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10589         nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10590         nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10591         nr_sack->nr_sack.reserved = htons(reserved);
10592         nr_sack->ch.chunk_length = htons(a_chk->send_size);
10593         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10594         asoc->ctrl_queue_cnt++;
10595         asoc->send_sack = 0;
10596         SCTP_STAT_INCR(sctps_sendsacks);
10597         return;
10598 }
10599
10600 void
10601 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10602 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10603     SCTP_UNUSED
10604 #endif
10605 )
10606 {
10607         struct mbuf *m_abort;
10608         struct mbuf *m_out = NULL, *m_end = NULL;
10609         struct sctp_abort_chunk *abort = NULL;
10610         int sz;
10611         uint32_t auth_offset = 0;
10612         struct sctp_auth_chunk *auth = NULL;
10613
10614         /*-
10615          * Add an AUTH chunk, if chunk requires it and save the offset into
10616          * the chain for AUTH
10617          */
10618         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10619             stcb->asoc.peer_auth_chunks)) {
10620                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10621                     stcb, SCTP_ABORT_ASSOCIATION);
10622                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10623         }
10624         SCTP_TCB_LOCK_ASSERT(stcb);
10625         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10626         if (m_abort == NULL) {
10627                 /* no mbuf's */
10628                 if (m_out)
10629                         sctp_m_freem(m_out);
10630                 return;
10631         }
10632         /* link in any error */
10633         SCTP_BUF_NEXT(m_abort) = operr;
10634         sz = 0;
10635         if (operr) {
10636                 struct mbuf *n;
10637
10638                 n = operr;
10639                 while (n) {
10640                         sz += SCTP_BUF_LEN(n);
10641                         n = SCTP_BUF_NEXT(n);
10642                 }
10643         }
10644         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10645         if (m_out == NULL) {
10646                 /* NO Auth chunk prepended, so reserve space in front */
10647                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10648                 m_out = m_abort;
10649         } else {
10650                 /* Put AUTH chunk at the front of the chain */
10651                 SCTP_BUF_NEXT(m_end) = m_abort;
10652         }
10653
10654         /* fill in the ABORT chunk */
10655         abort = mtod(m_abort, struct sctp_abort_chunk *);
10656         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10657         abort->ch.chunk_flags = 0;
10658         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10659
10660         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10661             stcb->asoc.primary_destination,
10662             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10663             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10664             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10665             stcb->asoc.primary_destination->port, so_locked, NULL);
10666         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10667 }
10668
10669 void
10670 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10671     struct sctp_nets *net)
10672 {
10673         /* formulate and SEND a SHUTDOWN-COMPLETE */
10674         struct mbuf *m_shutdown_comp;
10675         struct sctp_shutdown_complete_chunk *shutdown_complete;
10676
10677         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10678         if (m_shutdown_comp == NULL) {
10679                 /* no mbuf's */
10680                 return;
10681         }
10682         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10683         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10684         shutdown_complete->ch.chunk_flags = 0;
10685         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10686         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10687         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10688             (struct sockaddr *)&net->ro._l_addr,
10689             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10690             stcb->sctp_ep->sctp_lport, stcb->rport,
10691             htonl(stcb->asoc.peer_vtag),
10692             net->port, SCTP_SO_NOT_LOCKED, NULL);
10693         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10694         return;
10695 }
10696
10697 void
10698 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10699     uint32_t vrf_id, uint16_t port)
10700 {
10701         /* formulate and SEND a SHUTDOWN-COMPLETE */
10702         struct mbuf *o_pak;
10703         struct mbuf *mout;
10704         struct ip *iph, *iph_out;
10705         struct udphdr *udp = NULL;
10706
10707 #ifdef INET6
10708         struct ip6_hdr *ip6, *ip6_out;
10709
10710 #endif
10711         int offset_out, len, mlen;
10712         struct sctp_shutdown_complete_msg *comp_cp;
10713
10714         iph = mtod(m, struct ip *);
10715         switch (iph->ip_v) {
10716         case IPVERSION:
10717                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10718                 break;
10719 #ifdef INET6
10720         case IPV6_VERSION >> 4:
10721                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10722                 break;
10723 #endif
10724         default:
10725                 return;
10726         }
10727         if (port) {
10728                 len += sizeof(struct udphdr);
10729         }
10730         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10731         if (mout == NULL) {
10732                 return;
10733         }
10734         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10735         SCTP_BUF_LEN(mout) = len;
10736         SCTP_BUF_NEXT(mout) = NULL;
10737         iph_out = NULL;
10738 #ifdef INET6
10739         ip6_out = NULL;
10740 #endif
10741         offset_out = 0;
10742
10743         switch (iph->ip_v) {
10744         case IPVERSION:
10745                 iph_out = mtod(mout, struct ip *);
10746
10747                 /* Fill in the IP header for the ABORT */
10748                 iph_out->ip_v = IPVERSION;
10749                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10750                 iph_out->ip_tos = (u_char)0;
10751                 iph_out->ip_id = 0;
10752                 iph_out->ip_off = 0;
10753                 iph_out->ip_ttl = MAXTTL;
10754                 if (port) {
10755                         iph_out->ip_p = IPPROTO_UDP;
10756                 } else {
10757                         iph_out->ip_p = IPPROTO_SCTP;
10758                 }
10759                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10760                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10761
10762                 /* let IP layer calculate this */
10763                 iph_out->ip_sum = 0;
10764                 offset_out += sizeof(*iph_out);
10765                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10766                     (caddr_t)iph_out + offset_out);
10767                 break;
10768 #ifdef INET6
10769         case IPV6_VERSION >> 4:
10770                 ip6 = (struct ip6_hdr *)iph;
10771                 ip6_out = mtod(mout, struct ip6_hdr *);
10772
10773                 /* Fill in the IPv6 header for the ABORT */
10774                 ip6_out->ip6_flow = ip6->ip6_flow;
10775                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
10776                 if (port) {
10777                         ip6_out->ip6_nxt = IPPROTO_UDP;
10778                 } else {
10779                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10780                 }
10781                 ip6_out->ip6_src = ip6->ip6_dst;
10782                 ip6_out->ip6_dst = ip6->ip6_src;
10783                 /*
10784                  * ?? The old code had both the iph len + payload, I think
10785                  * this is wrong and would never have worked
10786                  */
10787                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10788                 offset_out += sizeof(*ip6_out);
10789                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10790                     (caddr_t)ip6_out + offset_out);
10791                 break;
10792 #endif                          /* INET6 */
10793         default:
10794                 /* Currently not supported. */
10795                 sctp_m_freem(mout);
10796                 return;
10797         }
10798         if (port) {
10799                 udp = (struct udphdr *)comp_cp;
10800                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10801                 udp->uh_dport = port;
10802                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10803                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10804                 offset_out += sizeof(struct udphdr);
10805                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10806         }
10807         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10808                 /* no mbuf's */
10809                 sctp_m_freem(mout);
10810                 return;
10811         }
10812         /* Now copy in and fill in the ABORT tags etc. */
10813         comp_cp->sh.src_port = sh->dest_port;
10814         comp_cp->sh.dest_port = sh->src_port;
10815         comp_cp->sh.checksum = 0;
10816         comp_cp->sh.v_tag = sh->v_tag;
10817         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10818         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10819         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10820
10821         if (iph_out != NULL) {
10822                 sctp_route_t ro;
10823                 int ret;
10824                 struct sctp_tcb *stcb = NULL;
10825
10826                 mlen = SCTP_BUF_LEN(mout);
10827                 bzero(&ro, sizeof ro);
10828                 /* set IPv4 length */
10829                 iph_out->ip_len = mlen;
10830 #ifdef  SCTP_PACKET_LOGGING
10831                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10832                         sctp_packet_log(mout, mlen);
10833 #endif
10834                 if (port) {
10835                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10836                         SCTP_STAT_INCR(sctps_sendswcrc);
10837                         SCTP_ENABLE_UDP_CSUM(mout);
10838                 } else {
10839                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10840                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
10841                         SCTP_STAT_INCR(sctps_sendhwcrc);
10842                 }
10843                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10844                 /* out it goes */
10845                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10846
10847                 /* Free the route if we got one back */
10848                 if (ro.ro_rt)
10849                         RTFREE(ro.ro_rt);
10850         }
10851 #ifdef INET6
10852         if (ip6_out != NULL) {
10853                 struct route_in6 ro;
10854                 int ret;
10855                 struct sctp_tcb *stcb = NULL;
10856                 struct ifnet *ifp = NULL;
10857
10858                 bzero(&ro, sizeof(ro));
10859                 mlen = SCTP_BUF_LEN(mout);
10860 #ifdef  SCTP_PACKET_LOGGING
10861                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10862                         sctp_packet_log(mout, mlen);
10863 #endif
10864                 comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10865                 SCTP_STAT_INCR(sctps_sendswcrc);
10866                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10867                 if (port) {
10868                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10869                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10870                                 udp->uh_sum = 0xffff;
10871                         }
10872                 }
10873                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10874
10875                 /* Free the route if we got one back */
10876                 if (ro.ro_rt)
10877                         RTFREE(ro.ro_rt);
10878         }
10879 #endif
10880         SCTP_STAT_INCR(sctps_sendpackets);
10881         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10882         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10883         return;
10884
10885 }
10886
10887 static struct sctp_nets *
10888 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10889 {
10890         struct sctp_nets *net, *hnet;
10891         int ms_goneby, highest_ms, state_overide = 0;
10892
10893         (void)SCTP_GETTIME_TIMEVAL(now);
10894         highest_ms = 0;
10895         hnet = NULL;
10896         SCTP_TCB_LOCK_ASSERT(stcb);
10897         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10898                 if (
10899                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10900                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10901                     ) {
10902                         /*
10903                          * Skip this guy from consideration if HB is off AND
10904                          * its confirmed
10905                          */
10906                         continue;
10907                 }
10908                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10909                         /* skip this dest net from consideration */
10910                         continue;
10911                 }
10912                 if (net->last_sent_time.tv_sec) {
10913                         /* Sent to so we subtract */
10914                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10915                 } else
10916                         /* Never been sent to */
10917                         ms_goneby = 0x7fffffff;
10918                 /*-
10919                  * When the address state is unconfirmed but still
10920                  * considered reachable, we HB at a higher rate. Once it
10921                  * goes confirmed OR reaches the "unreachable" state, thenw
10922                  * we cut it back to HB at a more normal pace.
10923                  */
10924                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10925                         state_overide = 1;
10926                 } else {
10927                         state_overide = 0;
10928                 }
10929
10930                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10931                     (ms_goneby > highest_ms)) {
10932                         highest_ms = ms_goneby;
10933                         hnet = net;
10934                 }
10935         }
10936         if (hnet &&
10937             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10938                 state_overide = 1;
10939         } else {
10940                 state_overide = 0;
10941         }
10942
10943         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10944                 /*-
10945                  * Found the one with longest delay bounds OR it is
10946                  * unconfirmed and still not marked unreachable.
10947                  */
10948                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10949 #ifdef SCTP_DEBUG
10950                 if (hnet) {
10951                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10952                             (struct sockaddr *)&hnet->ro._l_addr);
10953                 } else {
10954                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10955                 }
10956 #endif
10957                 /* update the timer now */
10958                 hnet->last_sent_time = *now;
10959                 return (hnet);
10960         }
10961         /* Nothing to HB */
10962         return (NULL);
10963 }
10964
10965 int
10966 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10967 {
10968         struct sctp_tmit_chunk *chk;
10969         struct sctp_nets *net;
10970         struct sctp_heartbeat_chunk *hb;
10971         struct timeval now;
10972         struct sockaddr_in *sin;
10973         struct sockaddr_in6 *sin6;
10974
10975         SCTP_TCB_LOCK_ASSERT(stcb);
10976         if (user_req == 0) {
10977                 net = sctp_select_hb_destination(stcb, &now);
10978                 if (net == NULL) {
10979                         /*-
10980                          * All our busy none to send to, just start the
10981                          * timer again.
10982                          */
10983                         if (stcb->asoc.state == 0) {
10984                                 return (0);
10985                         }
10986                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10987                             stcb->sctp_ep,
10988                             stcb,
10989                             net);
10990                         return (0);
10991                 }
10992         } else {
10993                 net = u_net;
10994                 if (net == NULL) {
10995                         return (0);
10996                 }
10997                 (void)SCTP_GETTIME_TIMEVAL(&now);
10998         }
10999         sin = (struct sockaddr_in *)&net->ro._l_addr;
11000         if (sin->sin_family != AF_INET) {
11001                 if (sin->sin_family != AF_INET6) {
11002                         /* huh */
11003                         return (0);
11004                 }
11005         }
11006         sctp_alloc_a_chunk(stcb, chk);
11007         if (chk == NULL) {
11008                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11009                 return (0);
11010         }
11011         chk->copy_by_ref = 0;
11012         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11013         chk->rec.chunk_id.can_take_data = 1;
11014         chk->asoc = &stcb->asoc;
11015         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11016
11017         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11018         if (chk->data == NULL) {
11019                 sctp_free_a_chunk(stcb, chk);
11020                 return (0);
11021         }
11022         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11023         SCTP_BUF_LEN(chk->data) = chk->send_size;
11024         chk->sent = SCTP_DATAGRAM_UNSENT;
11025         chk->snd_count = 0;
11026         chk->whoTo = net;
11027         atomic_add_int(&chk->whoTo->ref_count, 1);
11028         /* Now we have a mbuf that we can fill in with the details */
11029         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11030         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11031         /* fill out chunk header */
11032         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11033         hb->ch.chunk_flags = 0;
11034         hb->ch.chunk_length = htons(chk->send_size);
11035         /* Fill out hb parameter */
11036         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11037         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11038         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11039         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11040         /* Did our user request this one, put it in */
11041         hb->heartbeat.hb_info.user_req = user_req;
11042         hb->heartbeat.hb_info.addr_family = sin->sin_family;
11043         hb->heartbeat.hb_info.addr_len = sin->sin_len;
11044         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11045                 /*
11046                  * we only take from the entropy pool if the address is not
11047                  * confirmed.
11048                  */
11049                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11050                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11051         } else {
11052                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11053                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11054         }
11055         if (sin->sin_family == AF_INET) {
11056                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
11057         } else if (sin->sin_family == AF_INET6) {
11058                 /* We leave the scope the way it is in our lookup table. */
11059                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
11060                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
11061         } else {
11062                 /* huh compiler bug */
11063                 return (0);
11064         }
11065
11066         /*
11067          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
11068          * PF-heartbeats.  Because of this, threshold management is done by
11069          * the t3 timer handler, and does not need to be done upon the send
11070          * of a PF-heartbeat. If CMT PF is on and the destination to which a
11071          * heartbeat is being sent is in PF state, do NOT do threshold
11072          * management.
11073          */
11074         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
11075                 /* ok we have a destination that needs a beat */
11076                 /* lets do the theshold management Qiaobing style */
11077                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
11078                     stcb->asoc.max_send_times)) {
11079                         /*-
11080                          * we have lost the association, in a way this is
11081                          * quite bad since we really are one less time since
11082                          * we really did not send yet. This is the down side
11083                          * to the Q's style as defined in the RFC and not my
11084                          * alternate style defined in the RFC.
11085                          */
11086                         if (chk->data != NULL) {
11087                                 sctp_m_freem(chk->data);
11088                                 chk->data = NULL;
11089                         }
11090                         /*
11091                          * Here we do NOT use the macro since the
11092                          * association is now gone.
11093                          */
11094                         if (chk->whoTo) {
11095                                 sctp_free_remote_addr(chk->whoTo);
11096                                 chk->whoTo = NULL;
11097                         }
11098                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
11099                         return (-1);
11100                 }
11101         }
11102         net->hb_responded = 0;
11103         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11104         stcb->asoc.ctrl_queue_cnt++;
11105         SCTP_STAT_INCR(sctps_sendheartbeat);
11106         /*-
11107          * Call directly med level routine to put out the chunk. It will
11108          * always tumble out control chunks aka HB but it may even tumble
11109          * out data too.
11110          */
11111         return (1);
11112 }
11113
11114 void
11115 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11116     uint32_t high_tsn)
11117 {
11118         struct sctp_association *asoc;
11119         struct sctp_ecne_chunk *ecne;
11120         struct sctp_tmit_chunk *chk;
11121
11122         asoc = &stcb->asoc;
11123         SCTP_TCB_LOCK_ASSERT(stcb);
11124         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11125                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
11126                         /* found a previous ECN_ECHO update it if needed */
11127                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11128                         ecne->tsn = htonl(high_tsn);
11129                         return;
11130                 }
11131         }
11132         /* nope could not find one to update so we must build one */
11133         sctp_alloc_a_chunk(stcb, chk);
11134         if (chk == NULL) {
11135                 return;
11136         }
11137         chk->copy_by_ref = 0;
11138         SCTP_STAT_INCR(sctps_sendecne);
11139         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11140         chk->rec.chunk_id.can_take_data = 0;
11141         chk->asoc = &stcb->asoc;
11142         chk->send_size = sizeof(struct sctp_ecne_chunk);
11143         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11144         if (chk->data == NULL) {
11145                 sctp_free_a_chunk(stcb, chk);
11146                 return;
11147         }
11148         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11149         SCTP_BUF_LEN(chk->data) = chk->send_size;
11150         chk->sent = SCTP_DATAGRAM_UNSENT;
11151         chk->snd_count = 0;
11152         chk->whoTo = net;
11153         atomic_add_int(&chk->whoTo->ref_count, 1);
11154         stcb->asoc.ecn_echo_cnt_onq++;
11155         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11156         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11157         ecne->ch.chunk_flags = 0;
11158         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11159         ecne->tsn = htonl(high_tsn);
11160         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11161         asoc->ctrl_queue_cnt++;
11162 }
11163
11164 void
11165 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11166     struct mbuf *m, int iphlen, int bad_crc)
11167 {
11168         struct sctp_association *asoc;
11169         struct sctp_pktdrop_chunk *drp;
11170         struct sctp_tmit_chunk *chk;
11171         uint8_t *datap;
11172         int len;
11173         int was_trunc = 0;
11174         struct ip *iph;
11175
11176 #ifdef INET6
11177         struct ip6_hdr *ip6h;
11178
11179 #endif
11180         int fullsz = 0, extra = 0;
11181         long spc;
11182         int offset;
11183         struct sctp_chunkhdr *ch, chunk_buf;
11184         unsigned int chk_length;
11185
11186         if (!stcb) {
11187                 return;
11188         }
11189         asoc = &stcb->asoc;
11190         SCTP_TCB_LOCK_ASSERT(stcb);
11191         if (asoc->peer_supports_pktdrop == 0) {
11192                 /*-
11193                  * peer must declare support before I send one.
11194                  */
11195                 return;
11196         }
11197         if (stcb->sctp_socket == NULL) {
11198                 return;
11199         }
11200         sctp_alloc_a_chunk(stcb, chk);
11201         if (chk == NULL) {
11202                 return;
11203         }
11204         chk->copy_by_ref = 0;
11205         iph = mtod(m, struct ip *);
11206         if (iph == NULL) {
11207                 sctp_free_a_chunk(stcb, chk);
11208                 return;
11209         }
11210         switch (iph->ip_v) {
11211         case IPVERSION:
11212                 /* IPv4 */
11213                 len = chk->send_size = iph->ip_len;
11214                 break;
11215 #ifdef INET6
11216         case IPV6_VERSION >> 4:
11217                 /* IPv6 */
11218                 ip6h = mtod(m, struct ip6_hdr *);
11219                 len = chk->send_size = htons(ip6h->ip6_plen);
11220                 break;
11221 #endif
11222         default:
11223                 return;
11224         }
11225         /* Validate that we do not have an ABORT in here. */
11226         offset = iphlen + sizeof(struct sctphdr);
11227         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11228             sizeof(*ch), (uint8_t *) & chunk_buf);
11229         while (ch != NULL) {
11230                 chk_length = ntohs(ch->chunk_length);
11231                 if (chk_length < sizeof(*ch)) {
11232                         /* break to abort land */
11233                         break;
11234                 }
11235                 switch (ch->chunk_type) {
11236                 case SCTP_PACKET_DROPPED:
11237                 case SCTP_ABORT_ASSOCIATION:
11238                         /*-
11239                          * we don't respond with an PKT-DROP to an ABORT
11240                          * or PKT-DROP
11241                          */
11242                         sctp_free_a_chunk(stcb, chk);
11243                         return;
11244                 default:
11245                         break;
11246                 }
11247                 offset += SCTP_SIZE32(chk_length);
11248                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11249                     sizeof(*ch), (uint8_t *) & chunk_buf);
11250         }
11251
11252         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11253             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11254                 /*
11255                  * only send 1 mtu worth, trim off the excess on the end.
11256                  */
11257                 fullsz = len - extra;
11258                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11259                 was_trunc = 1;
11260         }
11261         chk->asoc = &stcb->asoc;
11262         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11263         if (chk->data == NULL) {
11264 jump_out:
11265                 sctp_free_a_chunk(stcb, chk);
11266                 return;
11267         }
11268         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11269         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11270         if (drp == NULL) {
11271                 sctp_m_freem(chk->data);
11272                 chk->data = NULL;
11273                 goto jump_out;
11274         }
11275         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11276             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11277         chk->book_size_scale = 0;
11278         if (was_trunc) {
11279                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11280                 drp->trunc_len = htons(fullsz);
11281                 /*
11282                  * Len is already adjusted to size minus overhead above take
11283                  * out the pkt_drop chunk itself from it.
11284                  */
11285                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11286                 len = chk->send_size;
11287         } else {
11288                 /* no truncation needed */
11289                 drp->ch.chunk_flags = 0;
11290                 drp->trunc_len = htons(0);
11291         }
11292         if (bad_crc) {
11293                 drp->ch.chunk_flags |= SCTP_BADCRC;
11294         }
11295         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11296         SCTP_BUF_LEN(chk->data) = chk->send_size;
11297         chk->sent = SCTP_DATAGRAM_UNSENT;
11298         chk->snd_count = 0;
11299         if (net) {
11300                 /* we should hit here */
11301                 chk->whoTo = net;
11302         } else {
11303                 chk->whoTo = asoc->primary_destination;
11304         }
11305         atomic_add_int(&chk->whoTo->ref_count, 1);
11306         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11307         chk->rec.chunk_id.can_take_data = 1;
11308         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11309         drp->ch.chunk_length = htons(chk->send_size);
11310         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11311         if (spc < 0) {
11312                 spc = 0;
11313         }
11314         drp->bottle_bw = htonl(spc);
11315         if (asoc->my_rwnd) {
11316                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11317                     asoc->size_on_all_streams +
11318                     asoc->my_rwnd_control_len +
11319                     stcb->sctp_socket->so_rcv.sb_cc);
11320         } else {
11321                 /*-
11322                  * If my rwnd is 0, possibly from mbuf depletion as well as
11323                  * space used, tell the peer there is NO space aka onq == bw
11324                  */
11325                 drp->current_onq = htonl(spc);
11326         }
11327         drp->reserved = 0;
11328         datap = drp->data;
11329         m_copydata(m, iphlen, len, (caddr_t)datap);
11330         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11331         asoc->ctrl_queue_cnt++;
11332 }
11333
11334 void
11335 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11336 {
11337         struct sctp_association *asoc;
11338         struct sctp_cwr_chunk *cwr;
11339         struct sctp_tmit_chunk *chk;
11340
11341         asoc = &stcb->asoc;
11342         SCTP_TCB_LOCK_ASSERT(stcb);
11343         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11344                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11345                         /* found a previous ECN_CWR update it if needed */
11346                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11347                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11348                             MAX_TSN)) {
11349                                 cwr->tsn = htonl(high_tsn);
11350                         }
11351                         return;
11352                 }
11353         }
11354         /* nope could not find one to update so we must build one */
11355         sctp_alloc_a_chunk(stcb, chk);
11356         if (chk == NULL) {
11357                 return;
11358         }
11359         chk->copy_by_ref = 0;
11360         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11361         chk->rec.chunk_id.can_take_data = 1;
11362         chk->asoc = &stcb->asoc;
11363         chk->send_size = sizeof(struct sctp_cwr_chunk);
11364         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11365         if (chk->data == NULL) {
11366                 sctp_free_a_chunk(stcb, chk);
11367                 return;
11368         }
11369         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11370         SCTP_BUF_LEN(chk->data) = chk->send_size;
11371         chk->sent = SCTP_DATAGRAM_UNSENT;
11372         chk->snd_count = 0;
11373         chk->whoTo = net;
11374         atomic_add_int(&chk->whoTo->ref_count, 1);
11375         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11376         cwr->ch.chunk_type = SCTP_ECN_CWR;
11377         cwr->ch.chunk_flags = 0;
11378         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11379         cwr->tsn = htonl(high_tsn);
11380         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11381         asoc->ctrl_queue_cnt++;
11382 }
11383
11384 void
11385 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11386     int number_entries, uint16_t * list,
11387     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11388 {
11389         int len, old_len, i;
11390         struct sctp_stream_reset_out_request *req_out;
11391         struct sctp_chunkhdr *ch;
11392
11393         ch = mtod(chk->data, struct sctp_chunkhdr *);
11394
11395
11396         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11397
11398         /* get to new offset for the param. */
11399         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11400         /* now how long will this param be? */
11401         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11402         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11403         req_out->ph.param_length = htons(len);
11404         req_out->request_seq = htonl(seq);
11405         req_out->response_seq = htonl(resp_seq);
11406         req_out->send_reset_at_tsn = htonl(last_sent);
11407         if (number_entries) {
11408                 for (i = 0; i < number_entries; i++) {
11409                         req_out->list_of_streams[i] = htons(list[i]);
11410                 }
11411         }
11412         if (SCTP_SIZE32(len) > len) {
11413                 /*-
11414                  * Need to worry about the pad we may end up adding to the
11415                  * end. This is easy since the struct is either aligned to 4
11416                  * bytes or 2 bytes off.
11417                  */
11418                 req_out->list_of_streams[number_entries] = 0;
11419         }
11420         /* now fix the chunk length */
11421         ch->chunk_length = htons(len + old_len);
11422         chk->book_size = len + old_len;
11423         chk->book_size_scale = 0;
11424         chk->send_size = SCTP_SIZE32(chk->book_size);
11425         SCTP_BUF_LEN(chk->data) = chk->send_size;
11426         return;
11427 }
11428
11429
11430 void
11431 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11432     int number_entries, uint16_t * list,
11433     uint32_t seq)
11434 {
11435         int len, old_len, i;
11436         struct sctp_stream_reset_in_request *req_in;
11437         struct sctp_chunkhdr *ch;
11438
11439         ch = mtod(chk->data, struct sctp_chunkhdr *);
11440
11441
11442         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11443
11444         /* get to new offset for the param. */
11445         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11446         /* now how long will this param be? */
11447         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11448         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11449         req_in->ph.param_length = htons(len);
11450         req_in->request_seq = htonl(seq);
11451         if (number_entries) {
11452                 for (i = 0; i < number_entries; i++) {
11453                         req_in->list_of_streams[i] = htons(list[i]);
11454                 }
11455         }
11456         if (SCTP_SIZE32(len) > len) {
11457                 /*-
11458                  * Need to worry about the pad we may end up adding to the
11459                  * end. This is easy since the struct is either aligned to 4
11460                  * bytes or 2 bytes off.
11461                  */
11462                 req_in->list_of_streams[number_entries] = 0;
11463         }
11464         /* now fix the chunk length */
11465         ch->chunk_length = htons(len + old_len);
11466         chk->book_size = len + old_len;
11467         chk->book_size_scale = 0;
11468         chk->send_size = SCTP_SIZE32(chk->book_size);
11469         SCTP_BUF_LEN(chk->data) = chk->send_size;
11470         return;
11471 }
11472
11473
11474 void
11475 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11476     uint32_t seq)
11477 {
11478         int len, old_len;
11479         struct sctp_stream_reset_tsn_request *req_tsn;
11480         struct sctp_chunkhdr *ch;
11481
11482         ch = mtod(chk->data, struct sctp_chunkhdr *);
11483
11484
11485         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11486
11487         /* get to new offset for the param. */
11488         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11489         /* now how long will this param be? */
11490         len = sizeof(struct sctp_stream_reset_tsn_request);
11491         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11492         req_tsn->ph.param_length = htons(len);
11493         req_tsn->request_seq = htonl(seq);
11494
11495         /* now fix the chunk length */
11496         ch->chunk_length = htons(len + old_len);
11497         chk->send_size = len + old_len;
11498         chk->book_size = SCTP_SIZE32(chk->send_size);
11499         chk->book_size_scale = 0;
11500         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11501         return;
11502 }
11503
11504 void
11505 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11506     uint32_t resp_seq, uint32_t result)
11507 {
11508         int len, old_len;
11509         struct sctp_stream_reset_response *resp;
11510         struct sctp_chunkhdr *ch;
11511
11512         ch = mtod(chk->data, struct sctp_chunkhdr *);
11513
11514
11515         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11516
11517         /* get to new offset for the param. */
11518         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11519         /* now how long will this param be? */
11520         len = sizeof(struct sctp_stream_reset_response);
11521         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11522         resp->ph.param_length = htons(len);
11523         resp->response_seq = htonl(resp_seq);
11524         resp->result = ntohl(result);
11525
11526         /* now fix the chunk length */
11527         ch->chunk_length = htons(len + old_len);
11528         chk->book_size = len + old_len;
11529         chk->book_size_scale = 0;
11530         chk->send_size = SCTP_SIZE32(chk->book_size);
11531         SCTP_BUF_LEN(chk->data) = chk->send_size;
11532         return;
11533
11534 }
11535
11536
11537 void
11538 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11539     uint32_t resp_seq, uint32_t result,
11540     uint32_t send_una, uint32_t recv_next)
11541 {
11542         int len, old_len;
11543         struct sctp_stream_reset_response_tsn *resp;
11544         struct sctp_chunkhdr *ch;
11545
11546         ch = mtod(chk->data, struct sctp_chunkhdr *);
11547
11548
11549         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11550
11551         /* get to new offset for the param. */
11552         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11553         /* now how long will this param be? */
11554         len = sizeof(struct sctp_stream_reset_response_tsn);
11555         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11556         resp->ph.param_length = htons(len);
11557         resp->response_seq = htonl(resp_seq);
11558         resp->result = htonl(result);
11559         resp->senders_next_tsn = htonl(send_una);
11560         resp->receivers_next_tsn = htonl(recv_next);
11561
11562         /* now fix the chunk length */
11563         ch->chunk_length = htons(len + old_len);
11564         chk->book_size = len + old_len;
11565         chk->send_size = SCTP_SIZE32(chk->book_size);
11566         chk->book_size_scale = 0;
11567         SCTP_BUF_LEN(chk->data) = chk->send_size;
11568         return;
11569 }
11570
11571 static void
11572 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11573     uint32_t seq,
11574     uint16_t adding)
11575 {
11576         int len, old_len;
11577         struct sctp_chunkhdr *ch;
11578         struct sctp_stream_reset_add_strm *addstr;
11579
11580         ch = mtod(chk->data, struct sctp_chunkhdr *);
11581         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11582
11583         /* get to new offset for the param. */
11584         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11585         /* now how long will this param be? */
11586         len = sizeof(struct sctp_stream_reset_add_strm);
11587
11588         /* Fill it out. */
11589         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11590         addstr->ph.param_length = htons(len);
11591         addstr->request_seq = htonl(seq);
11592         addstr->number_of_streams = htons(adding);
11593         addstr->reserved = 0;
11594
11595         /* now fix the chunk length */
11596         ch->chunk_length = htons(len + old_len);
11597         chk->send_size = len + old_len;
11598         chk->book_size = SCTP_SIZE32(chk->send_size);
11599         chk->book_size_scale = 0;
11600         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11601         return;
11602 }
11603
11604 int
11605 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11606     int number_entries, uint16_t * list,
11607     uint8_t send_out_req,
11608     uint32_t resp_seq,
11609     uint8_t send_in_req,
11610     uint8_t send_tsn_req,
11611     uint8_t add_stream,
11612     uint16_t adding
11613 )
11614 {
11615
11616         struct sctp_association *asoc;
11617         struct sctp_tmit_chunk *chk;
11618         struct sctp_chunkhdr *ch;
11619         uint32_t seq;
11620
11621         asoc = &stcb->asoc;
11622         if (asoc->stream_reset_outstanding) {
11623                 /*-
11624                  * Already one pending, must get ACK back to clear the flag.
11625                  */
11626                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11627                 return (EBUSY);
11628         }
11629         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11630             (add_stream == 0)) {
11631                 /* nothing to do */
11632                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11633                 return (EINVAL);
11634         }
11635         if (send_tsn_req && (send_out_req || send_in_req)) {
11636                 /* error, can't do that */
11637                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11638                 return (EINVAL);
11639         }
11640         sctp_alloc_a_chunk(stcb, chk);
11641         if (chk == NULL) {
11642                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11643                 return (ENOMEM);
11644         }
11645         chk->copy_by_ref = 0;
11646         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11647         chk->rec.chunk_id.can_take_data = 0;
11648         chk->asoc = &stcb->asoc;
11649         chk->book_size = sizeof(struct sctp_chunkhdr);
11650         chk->send_size = SCTP_SIZE32(chk->book_size);
11651         chk->book_size_scale = 0;
11652
11653         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11654         if (chk->data == NULL) {
11655                 sctp_free_a_chunk(stcb, chk);
11656                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11657                 return (ENOMEM);
11658         }
11659         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11660
11661         /* setup chunk parameters */
11662         chk->sent = SCTP_DATAGRAM_UNSENT;
11663         chk->snd_count = 0;
11664         chk->whoTo = asoc->primary_destination;
11665         atomic_add_int(&chk->whoTo->ref_count, 1);
11666
11667         ch = mtod(chk->data, struct sctp_chunkhdr *);
11668         ch->chunk_type = SCTP_STREAM_RESET;
11669         ch->chunk_flags = 0;
11670         ch->chunk_length = htons(chk->book_size);
11671         SCTP_BUF_LEN(chk->data) = chk->send_size;
11672
11673         seq = stcb->asoc.str_reset_seq_out;
11674         if (send_out_req) {
11675                 sctp_add_stream_reset_out(chk, number_entries, list,
11676                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11677                 asoc->stream_reset_out_is_outstanding = 1;
11678                 seq++;
11679                 asoc->stream_reset_outstanding++;
11680         }
11681         if (add_stream) {
11682                 sctp_add_a_stream(chk, seq, adding);
11683                 seq++;
11684                 asoc->stream_reset_outstanding++;
11685         }
11686         if (send_in_req) {
11687                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11688                 asoc->stream_reset_outstanding++;
11689         }
11690         if (send_tsn_req) {
11691                 sctp_add_stream_reset_tsn(chk, seq);
11692                 asoc->stream_reset_outstanding++;
11693         }
11694         asoc->str_reset = chk;
11695
11696         /* insert the chunk for sending */
11697         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11698             chk,
11699             sctp_next);
11700         asoc->ctrl_queue_cnt++;
11701         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11702         return (0);
11703 }
11704
11705 void
11706 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11707     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11708 {
11709         /*-
11710          * Formulate the abort message, and send it back down.
11711          */
11712         struct mbuf *o_pak;
11713         struct mbuf *mout;
11714         struct sctp_abort_msg *abm;
11715         struct ip *iph, *iph_out;
11716         struct udphdr *udp;
11717
11718 #ifdef INET6
11719         struct ip6_hdr *ip6, *ip6_out;
11720
11721 #endif
11722         int iphlen_out, len;
11723
11724         /* don't respond to ABORT with ABORT */
11725         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11726                 if (err_cause)
11727                         sctp_m_freem(err_cause);
11728                 return;
11729         }
11730         iph = mtod(m, struct ip *);
11731         switch (iph->ip_v) {
11732         case IPVERSION:
11733                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11734                 break;
11735 #ifdef INET6
11736         case IPV6_VERSION >> 4:
11737                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11738                 break;
11739 #endif
11740         default:
11741                 if (err_cause) {
11742                         sctp_m_freem(err_cause);
11743                 }
11744                 return;
11745         }
11746         if (port) {
11747                 len += sizeof(struct udphdr);
11748         }
11749         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11750         if (mout == NULL) {
11751                 if (err_cause) {
11752                         sctp_m_freem(err_cause);
11753                 }
11754                 return;
11755         }
11756         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11757         SCTP_BUF_LEN(mout) = len;
11758         SCTP_BUF_NEXT(mout) = err_cause;
11759         iph_out = NULL;
11760 #ifdef INET6
11761         ip6_out = NULL;
11762 #endif
11763         switch (iph->ip_v) {
11764         case IPVERSION:
11765                 iph_out = mtod(mout, struct ip *);
11766
11767                 /* Fill in the IP header for the ABORT */
11768                 iph_out->ip_v = IPVERSION;
11769                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11770                 iph_out->ip_tos = (u_char)0;
11771                 iph_out->ip_id = 0;
11772                 iph_out->ip_off = 0;
11773                 iph_out->ip_ttl = MAXTTL;
11774                 if (port) {
11775                         iph_out->ip_p = IPPROTO_UDP;
11776                 } else {
11777                         iph_out->ip_p = IPPROTO_SCTP;
11778                 }
11779                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11780                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11781                 /* let IP layer calculate this */
11782                 iph_out->ip_sum = 0;
11783
11784                 iphlen_out = sizeof(*iph_out);
11785                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11786                 break;
11787 #ifdef INET6
11788         case IPV6_VERSION >> 4:
11789                 ip6 = (struct ip6_hdr *)iph;
11790                 ip6_out = mtod(mout, struct ip6_hdr *);
11791
11792                 /* Fill in the IP6 header for the ABORT */
11793                 ip6_out->ip6_flow = ip6->ip6_flow;
11794                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11795                 if (port) {
11796                         ip6_out->ip6_nxt = IPPROTO_UDP;
11797                 } else {
11798                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11799                 }
11800                 ip6_out->ip6_src = ip6->ip6_dst;
11801                 ip6_out->ip6_dst = ip6->ip6_src;
11802
11803                 iphlen_out = sizeof(*ip6_out);
11804                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11805                 break;
11806 #endif                          /* INET6 */
11807         default:
11808                 /* Currently not supported */
11809                 sctp_m_freem(mout);
11810                 return;
11811         }
11812
11813         udp = (struct udphdr *)abm;
11814         if (port) {
11815                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11816                 udp->uh_dport = port;
11817                 /* set udp->uh_ulen later */
11818                 udp->uh_sum = 0;
11819                 iphlen_out += sizeof(struct udphdr);
11820                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11821         }
11822         abm->sh.src_port = sh->dest_port;
11823         abm->sh.dest_port = sh->src_port;
11824         abm->sh.checksum = 0;
11825         if (vtag == 0) {
11826                 abm->sh.v_tag = sh->v_tag;
11827                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11828         } else {
11829                 abm->sh.v_tag = htonl(vtag);
11830                 abm->msg.ch.chunk_flags = 0;
11831         }
11832         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11833
11834         if (err_cause) {
11835                 struct mbuf *m_tmp = err_cause;
11836                 int err_len = 0;
11837
11838                 /* get length of the err_cause chain */
11839                 while (m_tmp != NULL) {
11840                         err_len += SCTP_BUF_LEN(m_tmp);
11841                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11842                 }
11843                 len = SCTP_BUF_LEN(mout) + err_len;
11844                 if (err_len % 4) {
11845                         /* need pad at end of chunk */
11846                         uint32_t cpthis = 0;
11847                         int padlen;
11848
11849                         padlen = 4 - (len % 4);
11850                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11851                         len += padlen;
11852                 }
11853                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11854         } else {
11855                 len = SCTP_BUF_LEN(mout);
11856                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11857         }
11858
11859         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11860                 /* no mbuf's */
11861                 sctp_m_freem(mout);
11862                 return;
11863         }
11864         if (iph_out != NULL) {
11865                 sctp_route_t ro;
11866                 struct sctp_tcb *stcb = NULL;
11867                 int ret;
11868
11869                 /* zap the stack pointer to the route */
11870                 bzero(&ro, sizeof ro);
11871                 if (port) {
11872                         udp->uh_ulen = htons(len - sizeof(struct ip));
11873                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11874                 }
11875                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11876                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11877                 /* set IPv4 length */
11878                 iph_out->ip_len = len;
11879                 /* out it goes */
11880 #ifdef  SCTP_PACKET_LOGGING
11881                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11882                         sctp_packet_log(mout, len);
11883 #endif
11884                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11885                 if (port) {
11886                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11887                         SCTP_STAT_INCR(sctps_sendswcrc);
11888                         SCTP_ENABLE_UDP_CSUM(o_pak);
11889                 } else {
11890                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11891                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
11892                         SCTP_STAT_INCR(sctps_sendhwcrc);
11893                 }
11894                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11895
11896                 /* Free the route if we got one back */
11897                 if (ro.ro_rt)
11898                         RTFREE(ro.ro_rt);
11899         }
11900 #ifdef INET6
11901         if (ip6_out != NULL) {
11902                 struct route_in6 ro;
11903                 int ret;
11904                 struct sctp_tcb *stcb = NULL;
11905                 struct ifnet *ifp = NULL;
11906
11907                 /* zap the stack pointer to the route */
11908                 bzero(&ro, sizeof(ro));
11909                 if (port) {
11910                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11911                 }
11912                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11913                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11914                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11915 #ifdef  SCTP_PACKET_LOGGING
11916                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11917                         sctp_packet_log(mout, len);
11918 #endif
11919                 abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11920                 SCTP_STAT_INCR(sctps_sendswcrc);
11921                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11922                 if (port) {
11923                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11924                                 udp->uh_sum = 0xffff;
11925                         }
11926                 }
11927                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11928
11929                 /* Free the route if we got one back */
11930                 if (ro.ro_rt)
11931                         RTFREE(ro.ro_rt);
11932         }
11933 #endif
11934         SCTP_STAT_INCR(sctps_sendpackets);
11935         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11936         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11937 }
11938
11939 void
11940 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11941     uint32_t vrf_id, uint16_t port)
11942 {
11943         struct mbuf *o_pak;
11944         struct sctphdr *sh, *sh_out;
11945         struct sctp_chunkhdr *ch;
11946         struct ip *iph, *iph_out;
11947         struct udphdr *udp = NULL;
11948         struct mbuf *mout;
11949
11950 #ifdef INET6
11951         struct ip6_hdr *ip6, *ip6_out;
11952
11953 #endif
11954         int iphlen_out, len;
11955
11956         iph = mtod(m, struct ip *);
11957         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11958         switch (iph->ip_v) {
11959         case IPVERSION:
11960                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11961                 break;
11962 #ifdef INET6
11963         case IPV6_VERSION >> 4:
11964                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11965                 break;
11966 #endif
11967         default:
11968                 if (scm) {
11969                         sctp_m_freem(scm);
11970                 }
11971                 return;
11972         }
11973         if (port) {
11974                 len += sizeof(struct udphdr);
11975         }
11976         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11977         if (mout == NULL) {
11978                 if (scm) {
11979                         sctp_m_freem(scm);
11980                 }
11981                 return;
11982         }
11983         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11984         SCTP_BUF_LEN(mout) = len;
11985         SCTP_BUF_NEXT(mout) = scm;
11986         iph_out = NULL;
11987 #ifdef INET6
11988         ip6_out = NULL;
11989 #endif
11990         switch (iph->ip_v) {
11991         case IPVERSION:
11992                 iph_out = mtod(mout, struct ip *);
11993
11994                 /* Fill in the IP header for the ABORT */
11995                 iph_out->ip_v = IPVERSION;
11996                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11997                 iph_out->ip_tos = (u_char)0;
11998                 iph_out->ip_id = 0;
11999                 iph_out->ip_off = 0;
12000                 iph_out->ip_ttl = MAXTTL;
12001                 if (port) {
12002                         iph_out->ip_p = IPPROTO_UDP;
12003                 } else {
12004                         iph_out->ip_p = IPPROTO_SCTP;
12005                 }
12006                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12007                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12008                 /* let IP layer calculate this */
12009                 iph_out->ip_sum = 0;
12010
12011                 iphlen_out = sizeof(struct ip);
12012                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12013                 break;
12014 #ifdef INET6
12015         case IPV6_VERSION >> 4:
12016                 ip6 = (struct ip6_hdr *)iph;
12017                 ip6_out = mtod(mout, struct ip6_hdr *);
12018
12019                 /* Fill in the IP6 header for the ABORT */
12020                 ip6_out->ip6_flow = ip6->ip6_flow;
12021                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
12022                 if (port) {
12023                         ip6_out->ip6_nxt = IPPROTO_UDP;
12024                 } else {
12025                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12026                 }
12027                 ip6_out->ip6_src = ip6->ip6_dst;
12028                 ip6_out->ip6_dst = ip6->ip6_src;
12029
12030                 iphlen_out = sizeof(struct ip6_hdr);
12031                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12032                 break;
12033 #endif                          /* INET6 */
12034         default:
12035                 /* Currently not supported */
12036                 sctp_m_freem(mout);
12037                 return;
12038         }
12039
12040         udp = (struct udphdr *)sh_out;
12041         if (port) {
12042                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12043                 udp->uh_dport = port;
12044                 /* set udp->uh_ulen later */
12045                 udp->uh_sum = 0;
12046                 iphlen_out += sizeof(struct udphdr);
12047                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12048         }
12049         sh_out->src_port = sh->dest_port;
12050         sh_out->dest_port = sh->src_port;
12051         sh_out->v_tag = vtag;
12052         sh_out->checksum = 0;
12053
12054         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12055         ch->chunk_type = SCTP_OPERATION_ERROR;
12056         ch->chunk_flags = 0;
12057
12058         if (scm) {
12059                 struct mbuf *m_tmp = scm;
12060                 int cause_len = 0;
12061
12062                 /* get length of the err_cause chain */
12063                 while (m_tmp != NULL) {
12064                         cause_len += SCTP_BUF_LEN(m_tmp);
12065                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12066                 }
12067                 len = SCTP_BUF_LEN(mout) + cause_len;
12068                 if (cause_len % 4) {
12069                         /* need pad at end of chunk */
12070                         uint32_t cpthis = 0;
12071                         int padlen;
12072
12073                         padlen = 4 - (len % 4);
12074                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12075                         len += padlen;
12076                 }
12077                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12078         } else {
12079                 len = SCTP_BUF_LEN(mout);
12080                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12081         }
12082
12083         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12084                 /* no mbuf's */
12085                 sctp_m_freem(mout);
12086                 return;
12087         }
12088         if (iph_out != NULL) {
12089                 sctp_route_t ro;
12090                 struct sctp_tcb *stcb = NULL;
12091                 int ret;
12092
12093                 /* zap the stack pointer to the route */
12094                 bzero(&ro, sizeof ro);
12095                 if (port) {
12096                         udp->uh_ulen = htons(len - sizeof(struct ip));
12097                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12098                 }
12099                 /* set IPv4 length */
12100                 iph_out->ip_len = len;
12101                 /* out it goes */
12102 #ifdef  SCTP_PACKET_LOGGING
12103                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12104                         sctp_packet_log(mout, len);
12105 #endif
12106                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12107                 if (port) {
12108                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12109                         SCTP_STAT_INCR(sctps_sendswcrc);
12110                         SCTP_ENABLE_UDP_CSUM(o_pak);
12111                 } else {
12112                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12113                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
12114                         SCTP_STAT_INCR(sctps_sendhwcrc);
12115                 }
12116                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
12117
12118                 /* Free the route if we got one back */
12119                 if (ro.ro_rt)
12120                         RTFREE(ro.ro_rt);
12121         }
12122 #ifdef INET6
12123         if (ip6_out != NULL) {
12124                 struct route_in6 ro;
12125                 int ret;
12126                 struct sctp_tcb *stcb = NULL;
12127                 struct ifnet *ifp = NULL;
12128
12129                 /* zap the stack pointer to the route */
12130                 bzero(&ro, sizeof(ro));
12131                 if (port) {
12132                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12133                 }
12134                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12135 #ifdef  SCTP_PACKET_LOGGING
12136                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12137                         sctp_packet_log(mout, len);
12138 #endif
12139                 sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12140                 SCTP_STAT_INCR(sctps_sendswcrc);
12141                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12142                 if (port) {
12143                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12144                                 udp->uh_sum = 0xffff;
12145                         }
12146                 }
12147                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
12148
12149                 /* Free the route if we got one back */
12150                 if (ro.ro_rt)
12151                         RTFREE(ro.ro_rt);
12152         }
12153 #endif
12154         SCTP_STAT_INCR(sctps_sendpackets);
12155         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12156         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12157 }
12158
12159 static struct mbuf *
12160 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12161     struct uio *uio,
12162     struct sctp_sndrcvinfo *srcv,
12163     int max_send_len,
12164     int user_marks_eor,
12165     int *error,
12166     uint32_t * sndout,
12167     struct mbuf **new_tail)
12168 {
12169         struct mbuf *m;
12170
12171         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12172             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12173         if (m == NULL) {
12174                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12175                 *error = ENOMEM;
12176         } else {
12177                 *sndout = m_length(m, NULL);
12178                 *new_tail = m_last(m);
12179         }
12180         return (m);
12181 }
12182
12183 static int
12184 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12185     struct uio *uio,
12186     int resv_upfront)
12187 {
12188         int left;
12189
12190         left = sp->length;
12191         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12192             resv_upfront, 0);
12193         if (sp->data == NULL) {
12194                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12195                 return (ENOMEM);
12196         }
12197         sp->tail_mbuf = m_last(sp->data);
12198         return (0);
12199 }
12200
12201
12202
12203 static struct sctp_stream_queue_pending *
12204 sctp_copy_it_in(struct sctp_tcb *stcb,
12205     struct sctp_association *asoc,
12206     struct sctp_sndrcvinfo *srcv,
12207     struct uio *uio,
12208     struct sctp_nets *net,
12209     int max_send_len,
12210     int user_marks_eor,
12211     int *error,
12212     int non_blocking)
12213 {
12214         /*-
12215          * This routine must be very careful in its work. Protocol
12216          * processing is up and running so care must be taken to spl...()
12217          * when you need to do something that may effect the stcb/asoc. The
12218          * sb is locked however. When data is copied the protocol processing
12219          * should be enabled since this is a slower operation...
12220          */
12221         struct sctp_stream_queue_pending *sp = NULL;
12222         int resv_in_first;
12223
12224         *error = 0;
12225         /* Now can we send this? */
12226         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12227             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12228             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12229             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12230                 /* got data while shutting down */
12231                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12232                 *error = ECONNRESET;
12233                 goto out_now;
12234         }
12235         sctp_alloc_a_strmoq(stcb, sp);
12236         if (sp == NULL) {
12237                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12238                 *error = ENOMEM;
12239                 goto out_now;
12240         }
12241         sp->act_flags = 0;
12242         sp->sender_all_done = 0;
12243         sp->sinfo_flags = srcv->sinfo_flags;
12244         sp->timetolive = srcv->sinfo_timetolive;
12245         sp->ppid = srcv->sinfo_ppid;
12246         sp->context = srcv->sinfo_context;
12247         sp->strseq = 0;
12248         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12249
12250         sp->stream = srcv->sinfo_stream;
12251         sp->length = min(uio->uio_resid, max_send_len);
12252         if ((sp->length == (uint32_t) uio->uio_resid) &&
12253             ((user_marks_eor == 0) ||
12254             (srcv->sinfo_flags & SCTP_EOF) ||
12255             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12256                 sp->msg_is_complete = 1;
12257         } else {
12258                 sp->msg_is_complete = 0;
12259         }
12260         sp->sender_all_done = 0;
12261         sp->some_taken = 0;
12262         sp->put_last_out = 0;
12263         resv_in_first = sizeof(struct sctp_data_chunk);
12264         sp->data = sp->tail_mbuf = NULL;
12265         if (sp->length == 0) {
12266                 *error = 0;
12267                 goto skip_copy;
12268         }
12269         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12270         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12271                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12272                 sp->holds_key_ref = 1;
12273         }
12274         *error = sctp_copy_one(sp, uio, resv_in_first);
12275 skip_copy:
12276         if (*error) {
12277                 sctp_free_a_strmoq(stcb, sp);
12278                 sp = NULL;
12279         } else {
12280                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12281                         sp->net = net;
12282                         sp->addr_over = 1;
12283                 } else {
12284                         sp->net = asoc->primary_destination;
12285                         sp->addr_over = 0;
12286                 }
12287                 atomic_add_int(&sp->net->ref_count, 1);
12288                 sctp_set_prsctp_policy(stcb, sp);
12289         }
12290 out_now:
12291         return (sp);
12292 }
12293
12294
12295 int
12296 sctp_sosend(struct socket *so,
12297     struct sockaddr *addr,
12298     struct uio *uio,
12299     struct mbuf *top,
12300     struct mbuf *control,
12301     int flags,
12302     struct thread *p
12303 )
12304 {
12305         struct sctp_inpcb *inp;
12306         int error, use_rcvinfo = 0;
12307         struct sctp_sndrcvinfo srcv;
12308         struct sockaddr *addr_to_use;
12309
12310 #ifdef INET6
12311         struct sockaddr_in sin;
12312
12313 #endif
12314
12315         inp = (struct sctp_inpcb *)so->so_pcb;
12316         if (control) {
12317                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12318                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12319                     sizeof(srcv))) {
12320                         /* got one */
12321                         use_rcvinfo = 1;
12322                 }
12323         }
12324         addr_to_use = addr;
12325 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
12326         if ((addr) && (addr->sa_family == AF_INET6)) {
12327                 struct sockaddr_in6 *sin6;
12328
12329                 sin6 = (struct sockaddr_in6 *)addr;
12330                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12331                         in6_sin6_2_sin(&sin, sin6);
12332                         addr_to_use = (struct sockaddr *)&sin;
12333                 }
12334         }
12335 #endif
12336         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12337             control,
12338             flags,
12339             use_rcvinfo, &srcv
12340             ,p
12341             );
12342         return (error);
12343 }
12344
12345
12346 int
12347 sctp_lower_sosend(struct socket *so,
12348     struct sockaddr *addr,
12349     struct uio *uio,
12350     struct mbuf *i_pak,
12351     struct mbuf *control,
12352     int flags,
12353     int use_rcvinfo,
12354     struct sctp_sndrcvinfo *srcv
12355     ,
12356     struct thread *p
12357 )
12358 {
12359         unsigned int sndlen = 0, max_len;
12360         int error, len;
12361         struct mbuf *top = NULL;
12362         int queue_only = 0, queue_only_for_init = 0;
12363         int free_cnt_applied = 0;
12364         int un_sent = 0;
12365         int now_filled = 0;
12366         unsigned int inqueue_bytes = 0;
12367         struct sctp_block_entry be;
12368         struct sctp_inpcb *inp;
12369         struct sctp_tcb *stcb = NULL;
12370         struct timeval now;
12371         struct sctp_nets *net;
12372         struct sctp_association *asoc;
12373         struct sctp_inpcb *t_inp;
12374         int user_marks_eor;
12375         int create_lock_applied = 0;
12376         int nagle_applies = 0;
12377         int some_on_control = 0;
12378         int got_all_of_the_send = 0;
12379         int hold_tcblock = 0;
12380         int non_blocking = 0;
12381         int temp_flags = 0;
12382         uint32_t local_add_more, local_soresv = 0;
12383
12384         error = 0;
12385         net = NULL;
12386         stcb = NULL;
12387         asoc = NULL;
12388
12389         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12390         if (inp == NULL) {
12391                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12392                 error = EFAULT;
12393                 if (i_pak) {
12394                         SCTP_RELEASE_PKT(i_pak);
12395                 }
12396                 return (error);
12397         }
12398         if ((uio == NULL) && (i_pak == NULL)) {
12399                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12400                 return (EINVAL);
12401         }
12402         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12403         atomic_add_int(&inp->total_sends, 1);
12404         if (uio) {
12405                 if (uio->uio_resid < 0) {
12406                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12407                         return (EINVAL);
12408                 }
12409                 sndlen = uio->uio_resid;
12410         } else {
12411                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12412                 sndlen = SCTP_HEADER_LEN(i_pak);
12413         }
12414         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12415             addr,
12416             sndlen);
12417         /*-
12418          * Pre-screen address, if one is given the sin-len
12419          * must be set correctly!
12420          */
12421         if (addr) {
12422                 if ((addr->sa_family == AF_INET) &&
12423                     (addr->sa_len != sizeof(struct sockaddr_in))) {
12424                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12425                         error = EINVAL;
12426                         goto out_unlocked;
12427                 } else if ((addr->sa_family == AF_INET6) &&
12428                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
12429                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12430                         error = EINVAL;
12431                         goto out_unlocked;
12432                 }
12433         }
12434         hold_tcblock = 0;
12435
12436         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12437             (inp->sctp_socket->so_qlimit)) {
12438                 /* The listener can NOT send */
12439                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12440                 error = EFAULT;
12441                 goto out_unlocked;
12442         }
12443         if ((use_rcvinfo) && srcv) {
12444                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
12445                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
12446                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12447                         error = EINVAL;
12448                         goto out_unlocked;
12449                 }
12450                 if (srcv->sinfo_flags)
12451                         SCTP_STAT_INCR(sctps_sends_with_flags);
12452
12453                 if (srcv->sinfo_flags & SCTP_SENDALL) {
12454                         /* its a sendall */
12455                         error = sctp_sendall(inp, uio, top, srcv);
12456                         top = NULL;
12457                         goto out_unlocked;
12458                 }
12459         }
12460         /* now we must find the assoc */
12461         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12462             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12463                 SCTP_INP_RLOCK(inp);
12464                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12465                 if (stcb == NULL) {
12466                         SCTP_INP_RUNLOCK(inp);
12467                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12468                         error = ENOTCONN;
12469                         goto out_unlocked;
12470                 }
12471                 hold_tcblock = 0;
12472                 SCTP_INP_RUNLOCK(inp);
12473                 if (addr) {
12474                         /* Must locate the net structure if addr given */
12475                         net = sctp_findnet(stcb, addr);
12476                         if (net) {
12477                                 /* validate port was 0 or correct */
12478                                 struct sockaddr_in *sin;
12479
12480                                 sin = (struct sockaddr_in *)addr;
12481                                 if ((sin->sin_port != 0) &&
12482                                     (sin->sin_port != stcb->rport)) {
12483                                         net = NULL;
12484                                 }
12485                         }
12486                         temp_flags |= SCTP_ADDR_OVER;
12487                 } else
12488                         net = stcb->asoc.primary_destination;
12489                 if (addr && (net == NULL)) {
12490                         /* Could not find address, was it legal */
12491                         if (addr->sa_family == AF_INET) {
12492                                 struct sockaddr_in *sin;
12493
12494                                 sin = (struct sockaddr_in *)addr;
12495                                 if (sin->sin_addr.s_addr == 0) {
12496                                         if ((sin->sin_port == 0) ||
12497                                             (sin->sin_port == stcb->rport)) {
12498                                                 net = stcb->asoc.primary_destination;
12499                                         }
12500                                 }
12501                         } else {
12502                                 struct sockaddr_in6 *sin6;
12503
12504                                 sin6 = (struct sockaddr_in6 *)addr;
12505                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
12506                                         if ((sin6->sin6_port == 0) ||
12507                                             (sin6->sin6_port == stcb->rport)) {
12508                                                 net = stcb->asoc.primary_destination;
12509                                         }
12510                                 }
12511                         }
12512                 }
12513                 if (net == NULL) {
12514                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12515                         error = EINVAL;
12516                         goto out_unlocked;
12517                 }
12518         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
12519                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
12520                 if (stcb) {
12521                         if (addr)
12522                                 /*
12523                                  * Must locate the net structure if addr
12524                                  * given
12525                                  */
12526                                 net = sctp_findnet(stcb, addr);
12527                         else
12528                                 net = stcb->asoc.primary_destination;
12529                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
12530                             ((net == NULL) || (addr == NULL))) {
12531                                 struct sockaddr_in *sin;
12532
12533                                 if (addr == NULL) {
12534                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12535                                         error = EINVAL;
12536                                         goto out_unlocked;
12537                                 }
12538                                 sin = (struct sockaddr_in *)addr;
12539                                 /* Validate port is 0 or correct */
12540                                 if ((sin->sin_port != 0) &&
12541                                     (sin->sin_port != stcb->rport)) {
12542                                         net = NULL;
12543                                 }
12544                         }
12545                 }
12546                 hold_tcblock = 0;
12547         } else if (addr) {
12548                 /*-
12549                  * Since we did not use findep we must
12550                  * increment it, and if we don't find a tcb
12551                  * decrement it.
12552                  */
12553                 SCTP_INP_WLOCK(inp);
12554                 SCTP_INP_INCR_REF(inp);
12555                 SCTP_INP_WUNLOCK(inp);
12556                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12557                 if (stcb == NULL) {
12558                         SCTP_INP_WLOCK(inp);
12559                         SCTP_INP_DECR_REF(inp);
12560                         SCTP_INP_WUNLOCK(inp);
12561                 } else {
12562                         hold_tcblock = 1;
12563                 }
12564         }
12565         if ((stcb == NULL) && (addr)) {
12566                 /* Possible implicit send? */
12567                 SCTP_ASOC_CREATE_LOCK(inp);
12568                 create_lock_applied = 1;
12569                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12570                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12571                         /* Should I really unlock ? */
12572                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12573                         error = EFAULT;
12574                         goto out_unlocked;
12575
12576                 }
12577                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12578                     (addr->sa_family == AF_INET6)) {
12579                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12580                         error = EINVAL;
12581                         goto out_unlocked;
12582                 }
12583                 SCTP_INP_WLOCK(inp);
12584                 SCTP_INP_INCR_REF(inp);
12585                 SCTP_INP_WUNLOCK(inp);
12586                 /* With the lock applied look again */
12587                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12588                 if (stcb == NULL) {
12589                         SCTP_INP_WLOCK(inp);
12590                         SCTP_INP_DECR_REF(inp);
12591                         SCTP_INP_WUNLOCK(inp);
12592                 } else {
12593                         hold_tcblock = 1;
12594                 }
12595                 if (t_inp != inp) {
12596                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12597                         error = ENOTCONN;
12598                         goto out_unlocked;
12599                 }
12600         }
12601         if (stcb == NULL) {
12602                 if (addr == NULL) {
12603                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12604                         error = ENOENT;
12605                         goto out_unlocked;
12606                 } else {
12607                         /*
12608                          * UDP style, we must go ahead and start the INIT
12609                          * process
12610                          */
12611                         uint32_t vrf_id;
12612
12613                         if ((use_rcvinfo) && (srcv) &&
12614                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12615                             ((srcv->sinfo_flags & SCTP_EOF) &&
12616                             (sndlen == 0)))) {
12617                                 /*-
12618                                  * User asks to abort a non-existant assoc,
12619                                  * or EOF a non-existant assoc with no data
12620                                  */
12621                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12622                                 error = ENOENT;
12623                                 goto out_unlocked;
12624                         }
12625                         /* get an asoc/stcb struct */
12626                         vrf_id = inp->def_vrf_id;
12627 #ifdef INVARIANTS
12628                         if (create_lock_applied == 0) {
12629                                 panic("Error, should hold create lock and I don't?");
12630                         }
12631 #endif
12632                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12633                             p
12634                             );
12635                         if (stcb == NULL) {
12636                                 /* Error is setup for us in the call */
12637                                 goto out_unlocked;
12638                         }
12639                         if (create_lock_applied) {
12640                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12641                                 create_lock_applied = 0;
12642                         } else {
12643                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12644                         }
12645                         /*
12646                          * Turn on queue only flag to prevent data from
12647                          * being sent
12648                          */
12649                         queue_only = 1;
12650                         asoc = &stcb->asoc;
12651                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12652                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12653
12654                         /* initialize authentication params for the assoc */
12655                         sctp_initialize_auth_params(inp, stcb);
12656
12657                         if (control) {
12658                                 /*
12659                                  * see if a init structure exists in cmsg
12660                                  * headers
12661                                  */
12662                                 struct sctp_initmsg initm;
12663                                 int i;
12664
12665                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12666                                     sizeof(initm))) {
12667                                         /*
12668                                          * we have an INIT override of the
12669                                          * default
12670                                          */
12671                                         if (initm.sinit_max_attempts)
12672                                                 asoc->max_init_times = initm.sinit_max_attempts;
12673                                         if (initm.sinit_num_ostreams)
12674                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12675                                         if (initm.sinit_max_instreams)
12676                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12677                                         if (initm.sinit_max_init_timeo)
12678                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12679                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12680                                                 struct sctp_stream_out *tmp_str;
12681                                                 int had_lock = 0;
12682
12683                                                 /* Default is NOT correct */
12684                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12685                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12686                                                 /*
12687                                                  * What happens if this
12688                                                  * fails? we panic ...
12689                                                  */
12690
12691                                                 if (hold_tcblock) {
12692                                                         had_lock = 1;
12693                                                         SCTP_TCB_UNLOCK(stcb);
12694                                                 }
12695                                                 SCTP_MALLOC(tmp_str,
12696                                                     struct sctp_stream_out *,
12697                                                     (asoc->pre_open_streams *
12698                                                     sizeof(struct sctp_stream_out)),
12699                                                     SCTP_M_STRMO);
12700                                                 if (had_lock) {
12701                                                         SCTP_TCB_LOCK(stcb);
12702                                                 }
12703                                                 if (tmp_str != NULL) {
12704                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12705                                                         asoc->strmout = tmp_str;
12706                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12707                                                 } else {
12708                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12709                                                 }
12710                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12711                                                         /*-
12712                                                          * inbound side must be set
12713                                                          * to 0xffff, also NOTE when
12714                                                          * we get the INIT-ACK back
12715                                                          * (for INIT sender) we MUST
12716                                                          * reduce the count
12717                                                          * (streamoutcnt) but first
12718                                                          * check if we sent to any
12719                                                          * of the upper streams that
12720                                                          * were dropped (if some
12721                                                          * were). Those that were
12722                                                          * dropped must be notified
12723                                                          * to the upper layer as
12724                                                          * failed to send.
12725                                                          */
12726                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12727                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12728                                                         asoc->strmout[i].stream_no = i;
12729                                                         asoc->strmout[i].last_msg_incomplete = 0;
12730                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12731                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12732                                                 }
12733                                         }
12734                                 }
12735                         }
12736                         hold_tcblock = 1;
12737                         /* out with the INIT */
12738                         queue_only_for_init = 1;
12739                         /*-
12740                          * we may want to dig in after this call and adjust the MTU
12741                          * value. It defaulted to 1500 (constant) but the ro
12742                          * structure may now have an update and thus we may need to
12743                          * change it BEFORE we append the message.
12744                          */
12745                         net = stcb->asoc.primary_destination;
12746                         asoc = &stcb->asoc;
12747                 }
12748         }
12749         if ((SCTP_SO_IS_NBIO(so)
12750             || (flags & MSG_NBIO)
12751             )) {
12752                 non_blocking = 1;
12753         }
12754         asoc = &stcb->asoc;
12755         atomic_add_int(&stcb->total_sends, 1);
12756
12757         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12758                 if (sndlen > asoc->smallest_mtu) {
12759                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12760                         error = EMSGSIZE;
12761                         goto out_unlocked;
12762                 }
12763         }
12764         /* would we block? */
12765         if (non_blocking) {
12766                 if (hold_tcblock == 0) {
12767                         SCTP_TCB_LOCK(stcb);
12768                         hold_tcblock = 1;
12769                 }
12770                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12771                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12772                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12773                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12774                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12775                                 error = EMSGSIZE;
12776                         else
12777                                 error = EWOULDBLOCK;
12778                         goto out_unlocked;
12779                 }
12780                 stcb->asoc.sb_send_resv += sndlen;
12781                 SCTP_TCB_UNLOCK(stcb);
12782                 hold_tcblock = 0;
12783         } else {
12784                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12785         }
12786         local_soresv = sndlen;
12787         /* Keep the stcb from being freed under our feet */
12788         if (free_cnt_applied) {
12789 #ifdef INVARIANTS
12790                 panic("refcnt already incremented");
12791 #else
12792                 printf("refcnt:1 already incremented?\n");
12793 #endif
12794         } else {
12795                 atomic_add_int(&stcb->asoc.refcnt, 1);
12796                 free_cnt_applied = 1;
12797         }
12798         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12799                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12800                 error = ECONNRESET;
12801                 goto out_unlocked;
12802         }
12803         if (create_lock_applied) {
12804                 SCTP_ASOC_CREATE_UNLOCK(inp);
12805                 create_lock_applied = 0;
12806         }
12807         if (asoc->stream_reset_outstanding) {
12808                 /*
12809                  * Can't queue any data while stream reset is underway.
12810                  */
12811                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12812                 error = EAGAIN;
12813                 goto out_unlocked;
12814         }
12815         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12816             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12817                 queue_only = 1;
12818         }
12819         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12820                 /* Grab the default stuff from the asoc */
12821                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12822         }
12823         /* we are now done with all control */
12824         if (control) {
12825                 sctp_m_freem(control);
12826                 control = NULL;
12827         }
12828         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12829             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12830             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12831             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12832                 if ((use_rcvinfo) &&
12833                     (srcv->sinfo_flags & SCTP_ABORT)) {
12834                         ;
12835                 } else {
12836                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12837                         error = ECONNRESET;
12838                         goto out_unlocked;
12839                 }
12840         }
12841         /* Ok, we will attempt a msgsnd :> */
12842         if (p) {
12843                 p->td_ru.ru_msgsnd++;
12844         }
12845         if (stcb) {
12846                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12847                         net = stcb->asoc.primary_destination;
12848                 }
12849         }
12850         if (net == NULL) {
12851                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12852                 error = EINVAL;
12853                 goto out_unlocked;
12854         }
12855         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12856                 /*-
12857                  * CMT: Added check for CMT above. net above is the primary
12858                  * dest. If CMT is ON, sender should always attempt to send
12859                  * with the output routine sctp_fill_outqueue() that loops
12860                  * through all destination addresses. Therefore, if CMT is
12861                  * ON, queue_only is NOT set to 1 here, so that
12862                  * sctp_chunk_output() can be called below.
12863                  */
12864                 queue_only = 1;
12865         } else if (asoc->ifp_had_enobuf) {
12866                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12867                 if (net->flight_size > (net->mtu * 2))
12868                         queue_only = 1;
12869                 asoc->ifp_had_enobuf = 0;
12870         } else {
12871                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12872                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12873         }
12874         /* Are we aborting? */
12875         if (srcv->sinfo_flags & SCTP_ABORT) {
12876                 struct mbuf *mm;
12877                 int tot_demand, tot_out = 0, max_out;
12878
12879                 SCTP_STAT_INCR(sctps_sends_with_abort);
12880                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12881                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12882                         /* It has to be up before we abort */
12883                         /* how big is the user initiated abort? */
12884                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12885                         error = EINVAL;
12886                         goto out;
12887                 }
12888                 if (hold_tcblock) {
12889                         SCTP_TCB_UNLOCK(stcb);
12890                         hold_tcblock = 0;
12891                 }
12892                 if (top) {
12893                         struct mbuf *cntm = NULL;
12894
12895                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12896                         if (sndlen != 0) {
12897                                 cntm = top;
12898                                 while (cntm) {
12899                                         tot_out += SCTP_BUF_LEN(cntm);
12900                                         cntm = SCTP_BUF_NEXT(cntm);
12901                                 }
12902                         }
12903                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12904                 } else {
12905                         /* Must fit in a MTU */
12906                         tot_out = sndlen;
12907                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12908                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12909                                 /* To big */
12910                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12911                                 error = EMSGSIZE;
12912                                 goto out;
12913                         }
12914                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12915                 }
12916                 if (mm == NULL) {
12917                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12918                         error = ENOMEM;
12919                         goto out;
12920                 }
12921                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12922                 max_out -= sizeof(struct sctp_abort_msg);
12923                 if (tot_out > max_out) {
12924                         tot_out = max_out;
12925                 }
12926                 if (mm) {
12927                         struct sctp_paramhdr *ph;
12928
12929                         /* now move forward the data pointer */
12930                         ph = mtod(mm, struct sctp_paramhdr *);
12931                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12932                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12933                         ph++;
12934                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12935                         if (top == NULL) {
12936                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12937                                 if (error) {
12938                                         /*-
12939                                          * Here if we can't get his data we
12940                                          * still abort we just don't get to
12941                                          * send the users note :-0
12942                                          */
12943                                         sctp_m_freem(mm);
12944                                         mm = NULL;
12945                                 }
12946                         } else {
12947                                 if (sndlen != 0) {
12948                                         SCTP_BUF_NEXT(mm) = top;
12949                                 }
12950                         }
12951                 }
12952                 if (hold_tcblock == 0) {
12953                         SCTP_TCB_LOCK(stcb);
12954                         hold_tcblock = 1;
12955                 }
12956                 atomic_add_int(&stcb->asoc.refcnt, -1);
12957                 free_cnt_applied = 0;
12958                 /* release this lock, otherwise we hang on ourselves */
12959                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12960                     SCTP_RESPONSE_TO_USER_REQ,
12961                     mm, SCTP_SO_LOCKED);
12962                 /* now relock the stcb so everything is sane */
12963                 hold_tcblock = 0;
12964                 stcb = NULL;
12965                 /*
12966                  * In this case top is already chained to mm avoid double
12967                  * free, since we free it below if top != NULL and driver
12968                  * would free it after sending the packet out
12969                  */
12970                 if (sndlen != 0) {
12971                         top = NULL;
12972                 }
12973                 goto out_unlocked;
12974         }
12975         /* Calculate the maximum we can send */
12976         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12977         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12978                 if (non_blocking) {
12979                         /* we already checked for non-blocking above. */
12980                         max_len = sndlen;
12981                 } else {
12982                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12983                 }
12984         } else {
12985                 max_len = 0;
12986         }
12987         if (hold_tcblock) {
12988                 SCTP_TCB_UNLOCK(stcb);
12989                 hold_tcblock = 0;
12990         }
12991         /* Is the stream no. valid? */
12992         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12993                 /* Invalid stream number */
12994                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12995                 error = EINVAL;
12996                 goto out_unlocked;
12997         }
12998         if (asoc->strmout == NULL) {
12999                 /* huh? software error */
13000                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13001                 error = EFAULT;
13002                 goto out_unlocked;
13003         }
13004         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13005         if ((user_marks_eor == 0) &&
13006             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13007                 /* It will NEVER fit */
13008                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13009                 error = EMSGSIZE;
13010                 goto out_unlocked;
13011         }
13012         if ((uio == NULL) && user_marks_eor) {
13013                 /*-
13014                  * We do not support eeor mode for
13015                  * sending with mbuf chains (like sendfile).
13016                  */
13017                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13018                 error = EINVAL;
13019                 goto out_unlocked;
13020         }
13021         if (user_marks_eor) {
13022                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13023         } else {
13024                 /*-
13025                  * For non-eeor the whole message must fit in
13026                  * the socket send buffer.
13027                  */
13028                 local_add_more = sndlen;
13029         }
13030         len = 0;
13031         if (non_blocking) {
13032                 goto skip_preblock;
13033         }
13034         if (((max_len <= local_add_more) &&
13035             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13036             (max_len == 0) ||
13037             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13038                 /* No room right now ! */
13039                 SOCKBUF_LOCK(&so->so_snd);
13040                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13041                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13042                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13043                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13044                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13045                             inqueue_bytes,
13046                             local_add_more,
13047                             stcb->asoc.stream_queue_cnt,
13048                             stcb->asoc.chunks_on_out_queue,
13049                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13050                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13051                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13052                         }
13053                         be.error = 0;
13054                         stcb->block_entry = &be;
13055                         error = sbwait(&so->so_snd);
13056                         stcb->block_entry = NULL;
13057                         if (error || so->so_error || be.error) {
13058                                 if (error == 0) {
13059                                         if (so->so_error)
13060                                                 error = so->so_error;
13061                                         if (be.error) {
13062                                                 error = be.error;
13063                                         }
13064                                 }
13065                                 SOCKBUF_UNLOCK(&so->so_snd);
13066                                 goto out_unlocked;
13067                         }
13068                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13069                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13070                                     so, asoc, stcb->asoc.total_output_queue_size);
13071                         }
13072                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13073                                 goto out_unlocked;
13074                         }
13075                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13076                 }
13077                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13078                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13079                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13080                 } else {
13081                         max_len = 0;
13082                 }
13083                 SOCKBUF_UNLOCK(&so->so_snd);
13084         }
13085 skip_preblock:
13086         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13087                 goto out_unlocked;
13088         }
13089         /*
13090          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13091          * case NOTE: uio will be null when top/mbuf is passed
13092          */
13093         if (sndlen == 0) {
13094                 if (srcv->sinfo_flags & SCTP_EOF) {
13095                         got_all_of_the_send = 1;
13096                         goto dataless_eof;
13097                 } else {
13098                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13099                         error = EINVAL;
13100                         goto out;
13101                 }
13102         }
13103         if (top == NULL) {
13104                 struct sctp_stream_queue_pending *sp;
13105                 struct sctp_stream_out *strm;
13106                 uint32_t sndout, initial_out;
13107
13108                 initial_out = uio->uio_resid;
13109
13110                 SCTP_TCB_SEND_LOCK(stcb);
13111                 if ((asoc->stream_locked) &&
13112                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13113                         SCTP_TCB_SEND_UNLOCK(stcb);
13114                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13115                         error = EINVAL;
13116                         goto out;
13117                 }
13118                 SCTP_TCB_SEND_UNLOCK(stcb);
13119
13120                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13121                 if (strm->last_msg_incomplete == 0) {
13122         do_a_copy_in:
13123                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13124                         if ((sp == NULL) || (error)) {
13125                                 goto out;
13126                         }
13127                         SCTP_TCB_SEND_LOCK(stcb);
13128                         if (sp->msg_is_complete) {
13129                                 strm->last_msg_incomplete = 0;
13130                                 asoc->stream_locked = 0;
13131                         } else {
13132                                 /*
13133                                  * Just got locked to this guy in case of an
13134                                  * interrupt.
13135                                  */
13136                                 strm->last_msg_incomplete = 1;
13137                                 asoc->stream_locked = 1;
13138                                 asoc->stream_locked_on = srcv->sinfo_stream;
13139                                 sp->sender_all_done = 0;
13140                         }
13141                         sctp_snd_sb_alloc(stcb, sp->length);
13142                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13143                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13144                                 sp->strseq = strm->next_sequence_sent;
13145                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13146                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13147                                             (uintptr_t) stcb, sp->length,
13148                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13149                                 }
13150                                 strm->next_sequence_sent++;
13151                         } else {
13152                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13153                         }
13154                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13155                         if ((strm->next_spoke.tqe_next == NULL) &&
13156                             (strm->next_spoke.tqe_prev == NULL)) {
13157                                 /* Not on wheel, insert */
13158                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
13159                         }
13160                         SCTP_TCB_SEND_UNLOCK(stcb);
13161                 } else {
13162                         SCTP_TCB_SEND_LOCK(stcb);
13163                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13164                         SCTP_TCB_SEND_UNLOCK(stcb);
13165                         if (sp == NULL) {
13166                                 /* ???? Huh ??? last msg is gone */
13167 #ifdef INVARIANTS
13168                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13169 #else
13170                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13171                                 strm->last_msg_incomplete = 0;
13172 #endif
13173                                 goto do_a_copy_in;
13174
13175                         }
13176                 }
13177                 while (uio->uio_resid > 0) {
13178                         /* How much room do we have? */
13179                         struct mbuf *new_tail, *mm;
13180
13181                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13182                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13183                         else
13184                                 max_len = 0;
13185
13186                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13187                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13188                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13189                                 sndout = 0;
13190                                 new_tail = NULL;
13191                                 if (hold_tcblock) {
13192                                         SCTP_TCB_UNLOCK(stcb);
13193                                         hold_tcblock = 0;
13194                                 }
13195                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13196                                 if ((mm == NULL) || error) {
13197                                         if (mm) {
13198                                                 sctp_m_freem(mm);
13199                                         }
13200                                         goto out;
13201                                 }
13202                                 /* Update the mbuf and count */
13203                                 SCTP_TCB_SEND_LOCK(stcb);
13204                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13205                                         /*
13206                                          * we need to get out. Peer probably
13207                                          * aborted.
13208                                          */
13209                                         sctp_m_freem(mm);
13210                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13211                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13212                                                 error = ECONNRESET;
13213                                         }
13214                                         SCTP_TCB_SEND_UNLOCK(stcb);
13215                                         goto out;
13216                                 }
13217                                 if (sp->tail_mbuf) {
13218                                         /* tack it to the end */
13219                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13220                                         sp->tail_mbuf = new_tail;
13221                                 } else {
13222                                         /* A stolen mbuf */
13223                                         sp->data = mm;
13224                                         sp->tail_mbuf = new_tail;
13225                                 }
13226                                 sctp_snd_sb_alloc(stcb, sndout);
13227                                 atomic_add_int(&sp->length, sndout);
13228                                 len += sndout;
13229
13230                                 /* Did we reach EOR? */
13231                                 if ((uio->uio_resid == 0) &&
13232                                     ((user_marks_eor == 0) ||
13233                                     (srcv->sinfo_flags & SCTP_EOF) ||
13234                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13235                                         sp->msg_is_complete = 1;
13236                                 } else {
13237                                         sp->msg_is_complete = 0;
13238                                 }
13239                                 SCTP_TCB_SEND_UNLOCK(stcb);
13240                         }
13241                         if (uio->uio_resid == 0) {
13242                                 /* got it all? */
13243                                 continue;
13244                         }
13245                         /* PR-SCTP? */
13246                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13247                                 /*
13248                                  * This is ugly but we must assure locking
13249                                  * order
13250                                  */
13251                                 if (hold_tcblock == 0) {
13252                                         SCTP_TCB_LOCK(stcb);
13253                                         hold_tcblock = 1;
13254                                 }
13255                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13256                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13257                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13258                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13259                                 else
13260                                         max_len = 0;
13261                                 if (max_len > 0) {
13262                                         continue;
13263                                 }
13264                                 SCTP_TCB_UNLOCK(stcb);
13265                                 hold_tcblock = 0;
13266                         }
13267                         /* wait for space now */
13268                         if (non_blocking) {
13269                                 /* Non-blocking io in place out */
13270                                 goto skip_out_eof;
13271                         }
13272                         if ((net->flight_size > net->cwnd) &&
13273                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13274                                 queue_only = 1;
13275                         } else if (asoc->ifp_had_enobuf) {
13276                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13277                                 if (net->flight_size > (net->mtu * 2)) {
13278                                         queue_only = 1;
13279                                 } else {
13280                                         queue_only = 0;
13281                                 }
13282                                 asoc->ifp_had_enobuf = 0;
13283                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13284                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13285                         } else {
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                                 if (net->flight_size > net->cwnd) {
13289                                         queue_only = 1;
13290                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13291                                 } else {
13292                                         queue_only = 0;
13293                                 }
13294                         }
13295                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13296                             (stcb->asoc.total_flight > 0) &&
13297                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13298                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13299
13300                                 /*-
13301                                  * Ok, Nagle is set on and we have data outstanding.
13302                                  * Don't send anything and let SACKs drive out the
13303                                  * data unless wen have a "full" segment to send.
13304                                  */
13305                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13306                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13307                                 }
13308                                 SCTP_STAT_INCR(sctps_naglequeued);
13309                                 nagle_applies = 1;
13310                         } else {
13311                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13312                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13313                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13314                                 }
13315                                 SCTP_STAT_INCR(sctps_naglesent);
13316                                 nagle_applies = 0;
13317                         }
13318                         /* What about the INIT, send it maybe */
13319                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13320
13321                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13322                                     nagle_applies, un_sent);
13323                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13324                                     stcb->asoc.total_flight,
13325                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13326                         }
13327                         if (queue_only_for_init) {
13328                                 if (hold_tcblock == 0) {
13329                                         SCTP_TCB_LOCK(stcb);
13330                                         hold_tcblock = 1;
13331                                 }
13332                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13333                                         /* a collision took us forward? */
13334                                         queue_only_for_init = 0;
13335                                         queue_only = 0;
13336                                 } else {
13337                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13338                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13339                                         queue_only_for_init = 0;
13340                                         queue_only = 1;
13341                                 }
13342                         }
13343                         if ((queue_only == 0) && (nagle_applies == 0)) {
13344                                 /*-
13345                                  * need to start chunk output
13346                                  * before blocking.. note that if
13347                                  * a lock is already applied, then
13348                                  * the input via the net is happening
13349                                  * and I don't need to start output :-D
13350                                  */
13351                                 if (hold_tcblock == 0) {
13352                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13353                                                 hold_tcblock = 1;
13354                                                 sctp_chunk_output(inp,
13355                                                     stcb,
13356                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13357                                         }
13358                                 } else {
13359                                         sctp_chunk_output(inp,
13360                                             stcb,
13361                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13362                                 }
13363                                 if (hold_tcblock == 1) {
13364                                         SCTP_TCB_UNLOCK(stcb);
13365                                         hold_tcblock = 0;
13366                                 }
13367                         }
13368                         SOCKBUF_LOCK(&so->so_snd);
13369                         /*-
13370                          * This is a bit strange, but I think it will
13371                          * work. The total_output_queue_size is locked and
13372                          * protected by the TCB_LOCK, which we just released.
13373                          * There is a race that can occur between releasing it
13374                          * above, and me getting the socket lock, where sacks
13375                          * come in but we have not put the SB_WAIT on the
13376                          * so_snd buffer to get the wakeup. After the LOCK
13377                          * is applied the sack_processing will also need to
13378                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13379                          * once we have the socket buffer lock if we recheck the
13380                          * size we KNOW we will get to sleep safely with the
13381                          * wakeup flag in place.
13382                          */
13383                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13384                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13385                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13386                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13387                                             so, asoc, uio->uio_resid);
13388                                 }
13389                                 be.error = 0;
13390                                 stcb->block_entry = &be;
13391                                 error = sbwait(&so->so_snd);
13392                                 stcb->block_entry = NULL;
13393
13394                                 if (error || so->so_error || be.error) {
13395                                         if (error == 0) {
13396                                                 if (so->so_error)
13397                                                         error = so->so_error;
13398                                                 if (be.error) {
13399                                                         error = be.error;
13400                                                 }
13401                                         }
13402                                         SOCKBUF_UNLOCK(&so->so_snd);
13403                                         goto out_unlocked;
13404                                 }
13405                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13406                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13407                                             so, asoc, stcb->asoc.total_output_queue_size);
13408                                 }
13409                         }
13410                         SOCKBUF_UNLOCK(&so->so_snd);
13411                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13412                                 goto out_unlocked;
13413                         }
13414                 }
13415                 SCTP_TCB_SEND_LOCK(stcb);
13416                 if (sp) {
13417                         if (sp->msg_is_complete == 0) {
13418                                 strm->last_msg_incomplete = 1;
13419                                 asoc->stream_locked = 1;
13420                                 asoc->stream_locked_on = srcv->sinfo_stream;
13421                         } else {
13422                                 sp->sender_all_done = 1;
13423                                 strm->last_msg_incomplete = 0;
13424                                 asoc->stream_locked = 0;
13425                         }
13426                 } else {
13427                         SCTP_PRINTF("Huh no sp TSNH?\n");
13428                         strm->last_msg_incomplete = 0;
13429                         asoc->stream_locked = 0;
13430                 }
13431                 SCTP_TCB_SEND_UNLOCK(stcb);
13432                 if (uio->uio_resid == 0) {
13433                         got_all_of_the_send = 1;
13434                 }
13435         } else if (top) {
13436                 /* We send in a 0, since we do NOT have any locks */
13437                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13438                 top = NULL;
13439                 if (srcv->sinfo_flags & SCTP_EOF) {
13440                         /*
13441                          * This should only happen for Panda for the mbuf
13442                          * send case, which does NOT yet support EEOR mode.
13443                          * Thus, we can just set this flag to do the proper
13444                          * EOF handling.
13445                          */
13446                         got_all_of_the_send = 1;
13447                 }
13448         }
13449         if (error) {
13450                 goto out;
13451         }
13452 dataless_eof:
13453         /* EOF thing ? */
13454         if ((srcv->sinfo_flags & SCTP_EOF) &&
13455             (got_all_of_the_send == 1) &&
13456             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13457                 int cnt;
13458
13459                 SCTP_STAT_INCR(sctps_sends_with_eof);
13460                 error = 0;
13461                 if (hold_tcblock == 0) {
13462                         SCTP_TCB_LOCK(stcb);
13463                         hold_tcblock = 1;
13464                 }
13465                 cnt = sctp_is_there_unsent_data(stcb);
13466                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13467                     TAILQ_EMPTY(&asoc->sent_queue) &&
13468                     (cnt == 0)) {
13469                         if (asoc->locked_on_sending) {
13470                                 goto abort_anyway;
13471                         }
13472                         /* there is nothing queued to send, so I'm done... */
13473                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13474                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13475                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13476                                 /* only send SHUTDOWN the first time through */
13477                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13478                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13479                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13480                                 }
13481                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13482                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13483                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13484                                     asoc->primary_destination);
13485                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13486                                     asoc->primary_destination);
13487                         }
13488                 } else {
13489                         /*-
13490                          * we still got (or just got) data to send, so set
13491                          * SHUTDOWN_PENDING
13492                          */
13493                         /*-
13494                          * XXX sockets draft says that SCTP_EOF should be
13495                          * sent with no data.  currently, we will allow user
13496                          * data to be sent first and move to
13497                          * SHUTDOWN-PENDING
13498                          */
13499                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13500                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13501                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13502                                 if (hold_tcblock == 0) {
13503                                         SCTP_TCB_LOCK(stcb);
13504                                         hold_tcblock = 1;
13505                                 }
13506                                 if (asoc->locked_on_sending) {
13507                                         /* Locked to send out the data */
13508                                         struct sctp_stream_queue_pending *sp;
13509
13510                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13511                                         if (sp) {
13512                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13513                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13514                                         }
13515                                 }
13516                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13517                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13518                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13519                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13520                         abort_anyway:
13521                                         if (free_cnt_applied) {
13522                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13523                                                 free_cnt_applied = 0;
13524                                         }
13525                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13526                                             SCTP_RESPONSE_TO_USER_REQ,
13527                                             NULL, SCTP_SO_LOCKED);
13528                                         /*
13529                                          * now relock the stcb so everything
13530                                          * is sane
13531                                          */
13532                                         hold_tcblock = 0;
13533                                         stcb = NULL;
13534                                         goto out;
13535                                 }
13536                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13537                                     asoc->primary_destination);
13538                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13539                         }
13540                 }
13541         }
13542 skip_out_eof:
13543         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13544                 some_on_control = 1;
13545         }
13546         if ((net->flight_size > net->cwnd) &&
13547             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13548                 queue_only = 1;
13549         } else if (asoc->ifp_had_enobuf) {
13550                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13551                 if (net->flight_size > (net->mtu * 2)) {
13552                         queue_only = 1;
13553                 } else {
13554                         queue_only = 0;
13555                 }
13556                 asoc->ifp_had_enobuf = 0;
13557                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13558                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13559         } else {
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                 if (net->flight_size > net->cwnd) {
13563                         queue_only = 1;
13564                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13565                 } else {
13566                         queue_only = 0;
13567                 }
13568         }
13569         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13570             (stcb->asoc.total_flight > 0) &&
13571             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13572             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13573                 /*-
13574                  * Ok, Nagle is set on and we have data outstanding.
13575                  * Don't send anything and let SACKs drive out the
13576                  * data unless wen have a "full" segment to send.
13577                  */
13578                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13579                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13580                 }
13581                 SCTP_STAT_INCR(sctps_naglequeued);
13582                 nagle_applies = 1;
13583         } else {
13584                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13585                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13586                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13587                 }
13588                 SCTP_STAT_INCR(sctps_naglesent);
13589                 nagle_applies = 0;
13590         }
13591         if (queue_only_for_init) {
13592                 if (hold_tcblock == 0) {
13593                         SCTP_TCB_LOCK(stcb);
13594                         hold_tcblock = 1;
13595                 }
13596                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13597                         /* a collision took us forward? */
13598                         queue_only_for_init = 0;
13599                         queue_only = 0;
13600                 } else {
13601                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13602                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13603                         queue_only_for_init = 0;
13604                         queue_only = 1;
13605                 }
13606         }
13607         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13608                 /* we can attempt to send too. */
13609                 if (hold_tcblock == 0) {
13610                         /*
13611                          * If there is activity recv'ing sacks no need to
13612                          * send
13613                          */
13614                         if (SCTP_TCB_TRYLOCK(stcb)) {
13615                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13616                                 hold_tcblock = 1;
13617                         }
13618                 } else {
13619                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13620                 }
13621         } else if ((queue_only == 0) &&
13622                     (stcb->asoc.peers_rwnd == 0) &&
13623             (stcb->asoc.total_flight == 0)) {
13624                 /* We get to have a probe outstanding */
13625                 if (hold_tcblock == 0) {
13626                         hold_tcblock = 1;
13627                         SCTP_TCB_LOCK(stcb);
13628                 }
13629                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13630         } else if (some_on_control) {
13631                 int num_out, reason, frag_point;
13632
13633                 /* Here we do control only */
13634                 if (hold_tcblock == 0) {
13635                         hold_tcblock = 1;
13636                         SCTP_TCB_LOCK(stcb);
13637                 }
13638                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13639                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13640                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13641         }
13642         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13643             queue_only, stcb->asoc.peers_rwnd, un_sent,
13644             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13645             stcb->asoc.total_output_queue_size, error);
13646
13647 out:
13648 out_unlocked:
13649
13650         if (local_soresv && stcb) {
13651                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13652                 local_soresv = 0;
13653         }
13654         if (create_lock_applied) {
13655                 SCTP_ASOC_CREATE_UNLOCK(inp);
13656                 create_lock_applied = 0;
13657         }
13658         if ((stcb) && hold_tcblock) {
13659                 SCTP_TCB_UNLOCK(stcb);
13660         }
13661         if (stcb && free_cnt_applied) {
13662                 atomic_add_int(&stcb->asoc.refcnt, -1);
13663         }
13664 #ifdef INVARIANTS
13665         if (stcb) {
13666                 if (mtx_owned(&stcb->tcb_mtx)) {
13667                         panic("Leaving with tcb mtx owned?");
13668                 }
13669                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13670                         panic("Leaving with tcb send mtx owned?");
13671                 }
13672         }
13673 #endif
13674         if (top) {
13675                 sctp_m_freem(top);
13676         }
13677         if (control) {
13678                 sctp_m_freem(control);
13679         }
13680         return (error);
13681 }
13682
13683
13684 /*
13685  * generate an AUTHentication chunk, if required
13686  */
13687 struct mbuf *
13688 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13689     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13690     struct sctp_tcb *stcb, uint8_t chunk)
13691 {
13692         struct mbuf *m_auth;
13693         struct sctp_auth_chunk *auth;
13694         int chunk_len;
13695
13696         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13697             (stcb == NULL))
13698                 return (m);
13699
13700         /* sysctl disabled auth? */
13701         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13702                 return (m);
13703
13704         /* peer doesn't do auth... */
13705         if (!stcb->asoc.peer_supports_auth) {
13706                 return (m);
13707         }
13708         /* does the requested chunk require auth? */
13709         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13710                 return (m);
13711         }
13712         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13713         if (m_auth == NULL) {
13714                 /* no mbuf's */
13715                 return (m);
13716         }
13717         /* reserve some space if this will be the first mbuf */
13718         if (m == NULL)
13719                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13720         /* fill in the AUTH chunk details */
13721         auth = mtod(m_auth, struct sctp_auth_chunk *);
13722         bzero(auth, sizeof(*auth));
13723         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13724         auth->ch.chunk_flags = 0;
13725         chunk_len = sizeof(*auth) +
13726             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13727         auth->ch.chunk_length = htons(chunk_len);
13728         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13729         /* key id and hmac digest will be computed and filled in upon send */
13730
13731         /* save the offset where the auth was inserted into the chain */
13732         if (m != NULL) {
13733                 struct mbuf *cn;
13734
13735                 *offset = 0;
13736                 cn = m;
13737                 while (cn) {
13738                         *offset += SCTP_BUF_LEN(cn);
13739                         cn = SCTP_BUF_NEXT(cn);
13740                 }
13741         } else
13742                 *offset = 0;
13743
13744         /* update length and return pointer to the auth chunk */
13745         SCTP_BUF_LEN(m_auth) = chunk_len;
13746         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13747         if (auth_ret != NULL)
13748                 *auth_ret = auth;
13749
13750         return (m);
13751 }
13752
13753 #ifdef INET6
13754 int
13755 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13756 {
13757         struct nd_prefix *pfx = NULL;
13758         struct nd_pfxrouter *pfxrtr = NULL;
13759         struct sockaddr_in6 gw6;
13760
13761         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13762                 return (0);
13763
13764         /* get prefix entry of address */
13765         LIST_FOREACH(pfx, &MODULE_GLOBAL(MOD_INET6, nd_prefix), ndpr_entry) {
13766                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13767                         continue;
13768                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13769                     &src6->sin6_addr, &pfx->ndpr_mask))
13770                         break;
13771         }
13772         /* no prefix entry in the prefix list */
13773         if (pfx == NULL) {
13774                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13775                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13776                 return (0);
13777         }
13778         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13779         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13780
13781         /* search installed gateway from prefix entry */
13782         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13783             pfxrtr->pfr_next) {
13784                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13785                 gw6.sin6_family = AF_INET6;
13786                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13787                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13788                     sizeof(struct in6_addr));
13789                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13790                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13791                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13792                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13793                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13794                     ro->ro_rt->rt_gateway)) {
13795                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13796                         return (1);
13797                 }
13798         }
13799         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13800         return (0);
13801 }
13802
13803 #endif
13804
13805 int
13806 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13807 {
13808         struct sockaddr_in *sin, *mask;
13809         struct ifaddr *ifa;
13810         struct in_addr srcnetaddr, gwnetaddr;
13811
13812         if (ro == NULL || ro->ro_rt == NULL ||
13813             sifa->address.sa.sa_family != AF_INET) {
13814                 return (0);
13815         }
13816         ifa = (struct ifaddr *)sifa->ifa;
13817         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13818         sin = (struct sockaddr_in *)&sifa->address.sin;
13819         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13820         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13821         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13822         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13823
13824         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13825         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13826         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13827         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13828         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13829         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13830                 return (1);
13831         }
13832         return (0);
13833 }