sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <machine/in_cksum.h>
  55
  56
  57
  58 #define SCTP_MAX_GAPS_INARRAY 4
  59 struct sack_track {
  60         uint8_t right_edge;     /* mergable on the right edge */
  61         uint8_t left_edge;      /* mergable on the left edge */
  62         uint8_t num_entries;
  63         uint8_t spare;
  64         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  65 };
  66
  67 struct sack_track sack_array[256] = {
  68         {0, 0, 0, 0,            /* 0x00 */
  69                 {{0, 0},
  70                 {0, 0},
  71                 {0, 0},
  72                 {0, 0}
  73                 }
  74         },
  75         {1, 0, 1, 0,            /* 0x01 */
  76                 {{0, 0},
  77                 {0, 0},
  78                 {0, 0},
  79                 {0, 0}
  80                 }
  81         },
  82         {0, 0, 1, 0,            /* 0x02 */
  83                 {{1, 1},
  84                 {0, 0},
  85                 {0, 0},
  86                 {0, 0}
  87                 }
  88         },
  89         {1, 0, 1, 0,            /* 0x03 */
  90                 {{0, 1},
  91                 {0, 0},
  92                 {0, 0},
  93                 {0, 0}
  94                 }
  95         },
  96         {0, 0, 1, 0,            /* 0x04 */
  97                 {{2, 2},
  98                 {0, 0},
  99                 {0, 0},
 100                 {0, 0}
 101                 }
 102         },
 103         {1, 0, 2, 0,            /* 0x05 */
 104                 {{0, 0},
 105                 {2, 2},
 106                 {0, 0},
 107                 {0, 0}
 108                 }
 109         },
 110         {0, 0, 1, 0,            /* 0x06 */
 111                 {{1, 2},
 112                 {0, 0},
 113                 {0, 0},
 114                 {0, 0}
 115                 }
 116         },
 117         {1, 0, 1, 0,            /* 0x07 */
 118                 {{0, 2},
 119                 {0, 0},
 120                 {0, 0},
 121                 {0, 0}
 122                 }
 123         },
 124         {0, 0, 1, 0,            /* 0x08 */
 125                 {{3, 3},
 126                 {0, 0},
 127                 {0, 0},
 128                 {0, 0}
 129                 }
 130         },
 131         {1, 0, 2, 0,            /* 0x09 */
 132                 {{0, 0},
 133                 {3, 3},
 134                 {0, 0},
 135                 {0, 0}
 136                 }
 137         },
 138         {0, 0, 2, 0,            /* 0x0a */
 139                 {{1, 1},
 140                 {3, 3},
 141                 {0, 0},
 142                 {0, 0}
 143                 }
 144         },
 145         {1, 0, 2, 0,            /* 0x0b */
 146                 {{0, 1},
 147                 {3, 3},
 148                 {0, 0},
 149                 {0, 0}
 150                 }
 151         },
 152         {0, 0, 1, 0,            /* 0x0c */
 153                 {{2, 3},
 154                 {0, 0},
 155                 {0, 0},
 156                 {0, 0}
 157                 }
 158         },
 159         {1, 0, 2, 0,            /* 0x0d */
 160                 {{0, 0},
 161                 {2, 3},
 162                 {0, 0},
 163                 {0, 0}
 164                 }
 165         },
 166         {0, 0, 1, 0,            /* 0x0e */
 167                 {{1, 3},
 168                 {0, 0},
 169                 {0, 0},
 170                 {0, 0}
 171                 }
 172         },
 173         {1, 0, 1, 0,            /* 0x0f */
 174                 {{0, 3},
 175                 {0, 0},
 176                 {0, 0},
 177                 {0, 0}
 178                 }
 179         },
 180         {0, 0, 1, 0,            /* 0x10 */
 181                 {{4, 4},
 182                 {0, 0},
 183                 {0, 0},
 184                 {0, 0}
 185                 }
 186         },
 187         {1, 0, 2, 0,            /* 0x11 */
 188                 {{0, 0},
 189                 {4, 4},
 190                 {0, 0},
 191                 {0, 0}
 192                 }
 193         },
 194         {0, 0, 2, 0,            /* 0x12 */
 195                 {{1, 1},
 196                 {4, 4},
 197                 {0, 0},
 198                 {0, 0}
 199                 }
 200         },
 201         {1, 0, 2, 0,            /* 0x13 */
 202                 {{0, 1},
 203                 {4, 4},
 204                 {0, 0},
 205                 {0, 0}
 206                 }
 207         },
 208         {0, 0, 2, 0,            /* 0x14 */
 209                 {{2, 2},
 210                 {4, 4},
 211                 {0, 0},
 212                 {0, 0}
 213                 }
 214         },
 215         {1, 0, 3, 0,            /* 0x15 */
 216                 {{0, 0},
 217                 {2, 2},
 218                 {4, 4},
 219                 {0, 0}
 220                 }
 221         },
 222         {0, 0, 2, 0,            /* 0x16 */
 223                 {{1, 2},
 224                 {4, 4},
 225                 {0, 0},
 226                 {0, 0}
 227                 }
 228         },
 229         {1, 0, 2, 0,            /* 0x17 */
 230                 {{0, 2},
 231                 {4, 4},
 232                 {0, 0},
 233                 {0, 0}
 234                 }
 235         },
 236         {0, 0, 1, 0,            /* 0x18 */
 237                 {{3, 4},
 238                 {0, 0},
 239                 {0, 0},
 240                 {0, 0}
 241                 }
 242         },
 243         {1, 0, 2, 0,            /* 0x19 */
 244                 {{0, 0},
 245                 {3, 4},
 246                 {0, 0},
 247                 {0, 0}
 248                 }
 249         },
 250         {0, 0, 2, 0,            /* 0x1a */
 251                 {{1, 1},
 252                 {3, 4},
 253                 {0, 0},
 254                 {0, 0}
 255                 }
 256         },
 257         {1, 0, 2, 0,            /* 0x1b */
 258                 {{0, 1},
 259                 {3, 4},
 260                 {0, 0},
 261                 {0, 0}
 262                 }
 263         },
 264         {0, 0, 1, 0,            /* 0x1c */
 265                 {{2, 4},
 266                 {0, 0},
 267                 {0, 0},
 268                 {0, 0}
 269                 }
 270         },
 271         {1, 0, 2, 0,            /* 0x1d */
 272                 {{0, 0},
 273                 {2, 4},
 274                 {0, 0},
 275                 {0, 0}
 276                 }
 277         },
 278         {0, 0, 1, 0,            /* 0x1e */
 279                 {{1, 4},
 280                 {0, 0},
 281                 {0, 0},
 282                 {0, 0}
 283                 }
 284         },
 285         {1, 0, 1, 0,            /* 0x1f */
 286                 {{0, 4},
 287                 {0, 0},
 288                 {0, 0},
 289                 {0, 0}
 290                 }
 291         },
 292         {0, 0, 1, 0,            /* 0x20 */
 293                 {{5, 5},
 294                 {0, 0},
 295                 {0, 0},
 296                 {0, 0}
 297                 }
 298         },
 299         {1, 0, 2, 0,            /* 0x21 */
 300                 {{0, 0},
 301                 {5, 5},
 302                 {0, 0},
 303                 {0, 0}
 304                 }
 305         },
 306         {0, 0, 2, 0,            /* 0x22 */
 307                 {{1, 1},
 308                 {5, 5},
 309                 {0, 0},
 310                 {0, 0}
 311                 }
 312         },
 313         {1, 0, 2, 0,            /* 0x23 */
 314                 {{0, 1},
 315                 {5, 5},
 316                 {0, 0},
 317                 {0, 0}
 318                 }
 319         },
 320         {0, 0, 2, 0,            /* 0x24 */
 321                 {{2, 2},
 322                 {5, 5},
 323                 {0, 0},
 324                 {0, 0}
 325                 }
 326         },
 327         {1, 0, 3, 0,            /* 0x25 */
 328                 {{0, 0},
 329                 {2, 2},
 330                 {5, 5},
 331                 {0, 0}
 332                 }
 333         },
 334         {0, 0, 2, 0,            /* 0x26 */
 335                 {{1, 2},
 336                 {5, 5},
 337                 {0, 0},
 338                 {0, 0}
 339                 }
 340         },
 341         {1, 0, 2, 0,            /* 0x27 */
 342                 {{0, 2},
 343                 {5, 5},
 344                 {0, 0},
 345                 {0, 0}
 346                 }
 347         },
 348         {0, 0, 2, 0,            /* 0x28 */
 349                 {{3, 3},
 350                 {5, 5},
 351                 {0, 0},
 352                 {0, 0}
 353                 }
 354         },
 355         {1, 0, 3, 0,            /* 0x29 */
 356                 {{0, 0},
 357                 {3, 3},
 358                 {5, 5},
 359                 {0, 0}
 360                 }
 361         },
 362         {0, 0, 3, 0,            /* 0x2a */
 363                 {{1, 1},
 364                 {3, 3},
 365                 {5, 5},
 366                 {0, 0}
 367                 }
 368         },
 369         {1, 0, 3, 0,            /* 0x2b */
 370                 {{0, 1},
 371                 {3, 3},
 372                 {5, 5},
 373                 {0, 0}
 374                 }
 375         },
 376         {0, 0, 2, 0,            /* 0x2c */
 377                 {{2, 3},
 378                 {5, 5},
 379                 {0, 0},
 380                 {0, 0}
 381                 }
 382         },
 383         {1, 0, 3, 0,            /* 0x2d */
 384                 {{0, 0},
 385                 {2, 3},
 386                 {5, 5},
 387                 {0, 0}
 388                 }
 389         },
 390         {0, 0, 2, 0,            /* 0x2e */
 391                 {{1, 3},
 392                 {5, 5},
 393                 {0, 0},
 394                 {0, 0}
 395                 }
 396         },
 397         {1, 0, 2, 0,            /* 0x2f */
 398                 {{0, 3},
 399                 {5, 5},
 400                 {0, 0},
 401                 {0, 0}
 402                 }
 403         },
 404         {0, 0, 1, 0,            /* 0x30 */
 405                 {{4, 5},
 406                 {0, 0},
 407                 {0, 0},
 408                 {0, 0}
 409                 }
 410         },
 411         {1, 0, 2, 0,            /* 0x31 */
 412                 {{0, 0},
 413                 {4, 5},
 414                 {0, 0},
 415                 {0, 0}
 416                 }
 417         },
 418         {0, 0, 2, 0,            /* 0x32 */
 419                 {{1, 1},
 420                 {4, 5},
 421                 {0, 0},
 422                 {0, 0}
 423                 }
 424         },
 425         {1, 0, 2, 0,            /* 0x33 */
 426                 {{0, 1},
 427                 {4, 5},
 428                 {0, 0},
 429                 {0, 0}
 430                 }
 431         },
 432         {0, 0, 2, 0,            /* 0x34 */
 433                 {{2, 2},
 434                 {4, 5},
 435                 {0, 0},
 436                 {0, 0}
 437                 }
 438         },
 439         {1, 0, 3, 0,            /* 0x35 */
 440                 {{0, 0},
 441                 {2, 2},
 442                 {4, 5},
 443                 {0, 0}
 444                 }
 445         },
 446         {0, 0, 2, 0,            /* 0x36 */
 447                 {{1, 2},
 448                 {4, 5},
 449                 {0, 0},
 450                 {0, 0}
 451                 }
 452         },
 453         {1, 0, 2, 0,            /* 0x37 */
 454                 {{0, 2},
 455                 {4, 5},
 456                 {0, 0},
 457                 {0, 0}
 458                 }
 459         },
 460         {0, 0, 1, 0,            /* 0x38 */
 461                 {{3, 5},
 462                 {0, 0},
 463                 {0, 0},
 464                 {0, 0}
 465                 }
 466         },
 467         {1, 0, 2, 0,            /* 0x39 */
 468                 {{0, 0},
 469                 {3, 5},
 470                 {0, 0},
 471                 {0, 0}
 472                 }
 473         },
 474         {0, 0, 2, 0,            /* 0x3a */
 475                 {{1, 1},
 476                 {3, 5},
 477                 {0, 0},
 478                 {0, 0}
 479                 }
 480         },
 481         {1, 0, 2, 0,            /* 0x3b */
 482                 {{0, 1},
 483                 {3, 5},
 484                 {0, 0},
 485                 {0, 0}
 486                 }
 487         },
 488         {0, 0, 1, 0,            /* 0x3c */
 489                 {{2, 5},
 490                 {0, 0},
 491                 {0, 0},
 492                 {0, 0}
 493                 }
 494         },
 495         {1, 0, 2, 0,            /* 0x3d */
 496                 {{0, 0},
 497                 {2, 5},
 498                 {0, 0},
 499                 {0, 0}
 500                 }
 501         },
 502         {0, 0, 1, 0,            /* 0x3e */
 503                 {{1, 5},
 504                 {0, 0},
 505                 {0, 0},
 506                 {0, 0}
 507                 }
 508         },
 509         {1, 0, 1, 0,            /* 0x3f */
 510                 {{0, 5},
 511                 {0, 0},
 512                 {0, 0},
 513                 {0, 0}
 514                 }
 515         },
 516         {0, 0, 1, 0,            /* 0x40 */
 517                 {{6, 6},
 518                 {0, 0},
 519                 {0, 0},
 520                 {0, 0}
 521                 }
 522         },
 523         {1, 0, 2, 0,            /* 0x41 */
 524                 {{0, 0},
 525                 {6, 6},
 526                 {0, 0},
 527                 {0, 0}
 528                 }
 529         },
 530         {0, 0, 2, 0,            /* 0x42 */
 531                 {{1, 1},
 532                 {6, 6},
 533                 {0, 0},
 534                 {0, 0}
 535                 }
 536         },
 537         {1, 0, 2, 0,            /* 0x43 */
 538                 {{0, 1},
 539                 {6, 6},
 540                 {0, 0},
 541                 {0, 0}
 542                 }
 543         },
 544         {0, 0, 2, 0,            /* 0x44 */
 545                 {{2, 2},
 546                 {6, 6},
 547                 {0, 0},
 548                 {0, 0}
 549                 }
 550         },
 551         {1, 0, 3, 0,            /* 0x45 */
 552                 {{0, 0},
 553                 {2, 2},
 554                 {6, 6},
 555                 {0, 0}
 556                 }
 557         },
 558         {0, 0, 2, 0,            /* 0x46 */
 559                 {{1, 2},
 560                 {6, 6},
 561                 {0, 0},
 562                 {0, 0}
 563                 }
 564         },
 565         {1, 0, 2, 0,            /* 0x47 */
 566                 {{0, 2},
 567                 {6, 6},
 568                 {0, 0},
 569                 {0, 0}
 570                 }
 571         },
 572         {0, 0, 2, 0,            /* 0x48 */
 573                 {{3, 3},
 574                 {6, 6},
 575                 {0, 0},
 576                 {0, 0}
 577                 }
 578         },
 579         {1, 0, 3, 0,            /* 0x49 */
 580                 {{0, 0},
 581                 {3, 3},
 582                 {6, 6},
 583                 {0, 0}
 584                 }
 585         },
 586         {0, 0, 3, 0,            /* 0x4a */
 587                 {{1, 1},
 588                 {3, 3},
 589                 {6, 6},
 590                 {0, 0}
 591                 }
 592         },
 593         {1, 0, 3, 0,            /* 0x4b */
 594                 {{0, 1},
 595                 {3, 3},
 596                 {6, 6},
 597                 {0, 0}
 598                 }
 599         },
 600         {0, 0, 2, 0,            /* 0x4c */
 601                 {{2, 3},
 602                 {6, 6},
 603                 {0, 0},
 604                 {0, 0}
 605                 }
 606         },
 607         {1, 0, 3, 0,            /* 0x4d */
 608                 {{0, 0},
 609                 {2, 3},
 610                 {6, 6},
 611                 {0, 0}
 612                 }
 613         },
 614         {0, 0, 2, 0,            /* 0x4e */
 615                 {{1, 3},
 616                 {6, 6},
 617                 {0, 0},
 618                 {0, 0}
 619                 }
 620         },
 621         {1, 0, 2, 0,            /* 0x4f */
 622                 {{0, 3},
 623                 {6, 6},
 624                 {0, 0},
 625                 {0, 0}
 626                 }
 627         },
 628         {0, 0, 2, 0,            /* 0x50 */
 629                 {{4, 4},
 630                 {6, 6},
 631                 {0, 0},
 632                 {0, 0}
 633                 }
 634         },
 635         {1, 0, 3, 0,            /* 0x51 */
 636                 {{0, 0},
 637                 {4, 4},
 638                 {6, 6},
 639                 {0, 0}
 640                 }
 641         },
 642         {0, 0, 3, 0,            /* 0x52 */
 643                 {{1, 1},
 644                 {4, 4},
 645                 {6, 6},
 646                 {0, 0}
 647                 }
 648         },
 649         {1, 0, 3, 0,            /* 0x53 */
 650                 {{0, 1},
 651                 {4, 4},
 652                 {6, 6},
 653                 {0, 0}
 654                 }
 655         },
 656         {0, 0, 3, 0,            /* 0x54 */
 657                 {{2, 2},
 658                 {4, 4},
 659                 {6, 6},
 660                 {0, 0}
 661                 }
 662         },
 663         {1, 0, 4, 0,            /* 0x55 */
 664                 {{0, 0},
 665                 {2, 2},
 666                 {4, 4},
 667                 {6, 6}
 668                 }
 669         },
 670         {0, 0, 3, 0,            /* 0x56 */
 671                 {{1, 2},
 672                 {4, 4},
 673                 {6, 6},
 674                 {0, 0}
 675                 }
 676         },
 677         {1, 0, 3, 0,            /* 0x57 */
 678                 {{0, 2},
 679                 {4, 4},
 680                 {6, 6},
 681                 {0, 0}
 682                 }
 683         },
 684         {0, 0, 2, 0,            /* 0x58 */
 685                 {{3, 4},
 686                 {6, 6},
 687                 {0, 0},
 688                 {0, 0}
 689                 }
 690         },
 691         {1, 0, 3, 0,            /* 0x59 */
 692                 {{0, 0},
 693                 {3, 4},
 694                 {6, 6},
 695                 {0, 0}
 696                 }
 697         },
 698         {0, 0, 3, 0,            /* 0x5a */
 699                 {{1, 1},
 700                 {3, 4},
 701                 {6, 6},
 702                 {0, 0}
 703                 }
 704         },
 705         {1, 0, 3, 0,            /* 0x5b */
 706                 {{0, 1},
 707                 {3, 4},
 708                 {6, 6},
 709                 {0, 0}
 710                 }
 711         },
 712         {0, 0, 2, 0,            /* 0x5c */
 713                 {{2, 4},
 714                 {6, 6},
 715                 {0, 0},
 716                 {0, 0}
 717                 }
 718         },
 719         {1, 0, 3, 0,            /* 0x5d */
 720                 {{0, 0},
 721                 {2, 4},
 722                 {6, 6},
 723                 {0, 0}
 724                 }
 725         },
 726         {0, 0, 2, 0,            /* 0x5e */
 727                 {{1, 4},
 728                 {6, 6},
 729                 {0, 0},
 730                 {0, 0}
 731                 }
 732         },
 733         {1, 0, 2, 0,            /* 0x5f */
 734                 {{0, 4},
 735                 {6, 6},
 736                 {0, 0},
 737                 {0, 0}
 738                 }
 739         },
 740         {0, 0, 1, 0,            /* 0x60 */
 741                 {{5, 6},
 742                 {0, 0},
 743                 {0, 0},
 744                 {0, 0}
 745                 }
 746         },
 747         {1, 0, 2, 0,            /* 0x61 */
 748                 {{0, 0},
 749                 {5, 6},
 750                 {0, 0},
 751                 {0, 0}
 752                 }
 753         },
 754         {0, 0, 2, 0,            /* 0x62 */
 755                 {{1, 1},
 756                 {5, 6},
 757                 {0, 0},
 758                 {0, 0}
 759                 }
 760         },
 761         {1, 0, 2, 0,            /* 0x63 */
 762                 {{0, 1},
 763                 {5, 6},
 764                 {0, 0},
 765                 {0, 0}
 766                 }
 767         },
 768         {0, 0, 2, 0,            /* 0x64 */
 769                 {{2, 2},
 770                 {5, 6},
 771                 {0, 0},
 772                 {0, 0}
 773                 }
 774         },
 775         {1, 0, 3, 0,            /* 0x65 */
 776                 {{0, 0},
 777                 {2, 2},
 778                 {5, 6},
 779                 {0, 0}
 780                 }
 781         },
 782         {0, 0, 2, 0,            /* 0x66 */
 783                 {{1, 2},
 784                 {5, 6},
 785                 {0, 0},
 786                 {0, 0}
 787                 }
 788         },
 789         {1, 0, 2, 0,            /* 0x67 */
 790                 {{0, 2},
 791                 {5, 6},
 792                 {0, 0},
 793                 {0, 0}
 794                 }
 795         },
 796         {0, 0, 2, 0,            /* 0x68 */
 797                 {{3, 3},
 798                 {5, 6},
 799                 {0, 0},
 800                 {0, 0}
 801                 }
 802         },
 803         {1, 0, 3, 0,            /* 0x69 */
 804                 {{0, 0},
 805                 {3, 3},
 806                 {5, 6},
 807                 {0, 0}
 808                 }
 809         },
 810         {0, 0, 3, 0,            /* 0x6a */
 811                 {{1, 1},
 812                 {3, 3},
 813                 {5, 6},
 814                 {0, 0}
 815                 }
 816         },
 817         {1, 0, 3, 0,            /* 0x6b */
 818                 {{0, 1},
 819                 {3, 3},
 820                 {5, 6},
 821                 {0, 0}
 822                 }
 823         },
 824         {0, 0, 2, 0,            /* 0x6c */
 825                 {{2, 3},
 826                 {5, 6},
 827                 {0, 0},
 828                 {0, 0}
 829                 }
 830         },
 831         {1, 0, 3, 0,            /* 0x6d */
 832                 {{0, 0},
 833                 {2, 3},
 834                 {5, 6},
 835                 {0, 0}
 836                 }
 837         },
 838         {0, 0, 2, 0,            /* 0x6e */
 839                 {{1, 3},
 840                 {5, 6},
 841                 {0, 0},
 842                 {0, 0}
 843                 }
 844         },
 845         {1, 0, 2, 0,            /* 0x6f */
 846                 {{0, 3},
 847                 {5, 6},
 848                 {0, 0},
 849                 {0, 0}
 850                 }
 851         },
 852         {0, 0, 1, 0,            /* 0x70 */
 853                 {{4, 6},
 854                 {0, 0},
 855                 {0, 0},
 856                 {0, 0}
 857                 }
 858         },
 859         {1, 0, 2, 0,            /* 0x71 */
 860                 {{0, 0},
 861                 {4, 6},
 862                 {0, 0},
 863                 {0, 0}
 864                 }
 865         },
 866         {0, 0, 2, 0,            /* 0x72 */
 867                 {{1, 1},
 868                 {4, 6},
 869                 {0, 0},
 870                 {0, 0}
 871                 }
 872         },
 873         {1, 0, 2, 0,            /* 0x73 */
 874                 {{0, 1},
 875                 {4, 6},
 876                 {0, 0},
 877                 {0, 0}
 878                 }
 879         },
 880         {0, 0, 2, 0,            /* 0x74 */
 881                 {{2, 2},
 882                 {4, 6},
 883                 {0, 0},
 884                 {0, 0}
 885                 }
 886         },
 887         {1, 0, 3, 0,            /* 0x75 */
 888                 {{0, 0},
 889                 {2, 2},
 890                 {4, 6},
 891                 {0, 0}
 892                 }
 893         },
 894         {0, 0, 2, 0,            /* 0x76 */
 895                 {{1, 2},
 896                 {4, 6},
 897                 {0, 0},
 898                 {0, 0}
 899                 }
 900         },
 901         {1, 0, 2, 0,            /* 0x77 */
 902                 {{0, 2},
 903                 {4, 6},
 904                 {0, 0},
 905                 {0, 0}
 906                 }
 907         },
 908         {0, 0, 1, 0,            /* 0x78 */
 909                 {{3, 6},
 910                 {0, 0},
 911                 {0, 0},
 912                 {0, 0}
 913                 }
 914         },
 915         {1, 0, 2, 0,            /* 0x79 */
 916                 {{0, 0},
 917                 {3, 6},
 918                 {0, 0},
 919                 {0, 0}
 920                 }
 921         },
 922         {0, 0, 2, 0,            /* 0x7a */
 923                 {{1, 1},
 924                 {3, 6},
 925                 {0, 0},
 926                 {0, 0}
 927                 }
 928         },
 929         {1, 0, 2, 0,            /* 0x7b */
 930                 {{0, 1},
 931                 {3, 6},
 932                 {0, 0},
 933                 {0, 0}
 934                 }
 935         },
 936         {0, 0, 1, 0,            /* 0x7c */
 937                 {{2, 6},
 938                 {0, 0},
 939                 {0, 0},
 940                 {0, 0}
 941                 }
 942         },
 943         {1, 0, 2, 0,            /* 0x7d */
 944                 {{0, 0},
 945                 {2, 6},
 946                 {0, 0},
 947                 {0, 0}
 948                 }
 949         },
 950         {0, 0, 1, 0,            /* 0x7e */
 951                 {{1, 6},
 952                 {0, 0},
 953                 {0, 0},
 954                 {0, 0}
 955                 }
 956         },
 957         {1, 0, 1, 0,            /* 0x7f */
 958                 {{0, 6},
 959                 {0, 0},
 960                 {0, 0},
 961                 {0, 0}
 962                 }
 963         },
 964         {0, 1, 1, 0,            /* 0x80 */
 965                 {{7, 7},
 966                 {0, 0},
 967                 {0, 0},
 968                 {0, 0}
 969                 }
 970         },
 971         {1, 1, 2, 0,            /* 0x81 */
 972                 {{0, 0},
 973                 {7, 7},
 974                 {0, 0},
 975                 {0, 0}
 976                 }
 977         },
 978         {0, 1, 2, 0,            /* 0x82 */
 979                 {{1, 1},
 980                 {7, 7},
 981                 {0, 0},
 982                 {0, 0}
 983                 }
 984         },
 985         {1, 1, 2, 0,            /* 0x83 */
 986                 {{0, 1},
 987                 {7, 7},
 988                 {0, 0},
 989                 {0, 0}
 990                 }
 991         },
 992         {0, 1, 2, 0,            /* 0x84 */
 993                 {{2, 2},
 994                 {7, 7},
 995                 {0, 0},
 996                 {0, 0}
 997                 }
 998         },
 999         {1, 1, 3, 0,            /* 0x85 */
1000                 {{0, 0},
1001                 {2, 2},
1002                 {7, 7},
1003                 {0, 0}
1004                 }
1005         },
1006         {0, 1, 2, 0,            /* 0x86 */
1007                 {{1, 2},
1008                 {7, 7},
1009                 {0, 0},
1010                 {0, 0}
1011                 }
1012         },
1013         {1, 1, 2, 0,            /* 0x87 */
1014                 {{0, 2},
1015                 {7, 7},
1016                 {0, 0},
1017                 {0, 0}
1018                 }
1019         },
1020         {0, 1, 2, 0,            /* 0x88 */
1021                 {{3, 3},
1022                 {7, 7},
1023                 {0, 0},
1024                 {0, 0}
1025                 }
1026         },
1027         {1, 1, 3, 0,            /* 0x89 */
1028                 {{0, 0},
1029                 {3, 3},
1030                 {7, 7},
1031                 {0, 0}
1032                 }
1033         },
1034         {0, 1, 3, 0,            /* 0x8a */
1035                 {{1, 1},
1036                 {3, 3},
1037                 {7, 7},
1038                 {0, 0}
1039                 }
1040         },
1041         {1, 1, 3, 0,            /* 0x8b */
1042                 {{0, 1},
1043                 {3, 3},
1044                 {7, 7},
1045                 {0, 0}
1046                 }
1047         },
1048         {0, 1, 2, 0,            /* 0x8c */
1049                 {{2, 3},
1050                 {7, 7},
1051                 {0, 0},
1052                 {0, 0}
1053                 }
1054         },
1055         {1, 1, 3, 0,            /* 0x8d */
1056                 {{0, 0},
1057                 {2, 3},
1058                 {7, 7},
1059                 {0, 0}
1060                 }
1061         },
1062         {0, 1, 2, 0,            /* 0x8e */
1063                 {{1, 3},
1064                 {7, 7},
1065                 {0, 0},
1066                 {0, 0}
1067                 }
1068         },
1069         {1, 1, 2, 0,            /* 0x8f */
1070                 {{0, 3},
1071                 {7, 7},
1072                 {0, 0},
1073                 {0, 0}
1074                 }
1075         },
1076         {0, 1, 2, 0,            /* 0x90 */
1077                 {{4, 4},
1078                 {7, 7},
1079                 {0, 0},
1080                 {0, 0}
1081                 }
1082         },
1083         {1, 1, 3, 0,            /* 0x91 */
1084                 {{0, 0},
1085                 {4, 4},
1086                 {7, 7},
1087                 {0, 0}
1088                 }
1089         },
1090         {0, 1, 3, 0,            /* 0x92 */
1091                 {{1, 1},
1092                 {4, 4},
1093                 {7, 7},
1094                 {0, 0}
1095                 }
1096         },
1097         {1, 1, 3, 0,            /* 0x93 */
1098                 {{0, 1},
1099                 {4, 4},
1100                 {7, 7},
1101                 {0, 0}
1102                 }
1103         },
1104         {0, 1, 3, 0,            /* 0x94 */
1105                 {{2, 2},
1106                 {4, 4},
1107                 {7, 7},
1108                 {0, 0}
1109                 }
1110         },
1111         {1, 1, 4, 0,            /* 0x95 */
1112                 {{0, 0},
1113                 {2, 2},
1114                 {4, 4},
1115                 {7, 7}
1116                 }
1117         },
1118         {0, 1, 3, 0,            /* 0x96 */
1119                 {{1, 2},
1120                 {4, 4},
1121                 {7, 7},
1122                 {0, 0}
1123                 }
1124         },
1125         {1, 1, 3, 0,            /* 0x97 */
1126                 {{0, 2},
1127                 {4, 4},
1128                 {7, 7},
1129                 {0, 0}
1130                 }
1131         },
1132         {0, 1, 2, 0,            /* 0x98 */
1133                 {{3, 4},
1134                 {7, 7},
1135                 {0, 0},
1136                 {0, 0}
1137                 }
1138         },
1139         {1, 1, 3, 0,            /* 0x99 */
1140                 {{0, 0},
1141                 {3, 4},
1142                 {7, 7},
1143                 {0, 0}
1144                 }
1145         },
1146         {0, 1, 3, 0,            /* 0x9a */
1147                 {{1, 1},
1148                 {3, 4},
1149                 {7, 7},
1150                 {0, 0}
1151                 }
1152         },
1153         {1, 1, 3, 0,            /* 0x9b */
1154                 {{0, 1},
1155                 {3, 4},
1156                 {7, 7},
1157                 {0, 0}
1158                 }
1159         },
1160         {0, 1, 2, 0,            /* 0x9c */
1161                 {{2, 4},
1162                 {7, 7},
1163                 {0, 0},
1164                 {0, 0}
1165                 }
1166         },
1167         {1, 1, 3, 0,            /* 0x9d */
1168                 {{0, 0},
1169                 {2, 4},
1170                 {7, 7},
1171                 {0, 0}
1172                 }
1173         },
1174         {0, 1, 2, 0,            /* 0x9e */
1175                 {{1, 4},
1176                 {7, 7},
1177                 {0, 0},
1178                 {0, 0}
1179                 }
1180         },
1181         {1, 1, 2, 0,            /* 0x9f */
1182                 {{0, 4},
1183                 {7, 7},
1184                 {0, 0},
1185                 {0, 0}
1186                 }
1187         },
1188         {0, 1, 2, 0,            /* 0xa0 */
1189                 {{5, 5},
1190                 {7, 7},
1191                 {0, 0},
1192                 {0, 0}
1193                 }
1194         },
1195         {1, 1, 3, 0,            /* 0xa1 */
1196                 {{0, 0},
1197                 {5, 5},
1198                 {7, 7},
1199                 {0, 0}
1200                 }
1201         },
1202         {0, 1, 3, 0,            /* 0xa2 */
1203                 {{1, 1},
1204                 {5, 5},
1205                 {7, 7},
1206                 {0, 0}
1207                 }
1208         },
1209         {1, 1, 3, 0,            /* 0xa3 */
1210                 {{0, 1},
1211                 {5, 5},
1212                 {7, 7},
1213                 {0, 0}
1214                 }
1215         },
1216         {0, 1, 3, 0,            /* 0xa4 */
1217                 {{2, 2},
1218                 {5, 5},
1219                 {7, 7},
1220                 {0, 0}
1221                 }
1222         },
1223         {1, 1, 4, 0,            /* 0xa5 */
1224                 {{0, 0},
1225                 {2, 2},
1226                 {5, 5},
1227                 {7, 7}
1228                 }
1229         },
1230         {0, 1, 3, 0,            /* 0xa6 */
1231                 {{1, 2},
1232                 {5, 5},
1233                 {7, 7},
1234                 {0, 0}
1235                 }
1236         },
1237         {1, 1, 3, 0,            /* 0xa7 */
1238                 {{0, 2},
1239                 {5, 5},
1240                 {7, 7},
1241                 {0, 0}
1242                 }
1243         },
1244         {0, 1, 3, 0,            /* 0xa8 */
1245                 {{3, 3},
1246                 {5, 5},
1247                 {7, 7},
1248                 {0, 0}
1249                 }
1250         },
1251         {1, 1, 4, 0,            /* 0xa9 */
1252                 {{0, 0},
1253                 {3, 3},
1254                 {5, 5},
1255                 {7, 7}
1256                 }
1257         },
1258         {0, 1, 4, 0,            /* 0xaa */
1259                 {{1, 1},
1260                 {3, 3},
1261                 {5, 5},
1262                 {7, 7}
1263                 }
1264         },
1265         {1, 1, 4, 0,            /* 0xab */
1266                 {{0, 1},
1267                 {3, 3},
1268                 {5, 5},
1269                 {7, 7}
1270                 }
1271         },
1272         {0, 1, 3, 0,            /* 0xac */
1273                 {{2, 3},
1274                 {5, 5},
1275                 {7, 7},
1276                 {0, 0}
1277                 }
1278         },
1279         {1, 1, 4, 0,            /* 0xad */
1280                 {{0, 0},
1281                 {2, 3},
1282                 {5, 5},
1283                 {7, 7}
1284                 }
1285         },
1286         {0, 1, 3, 0,            /* 0xae */
1287                 {{1, 3},
1288                 {5, 5},
1289                 {7, 7},
1290                 {0, 0}
1291                 }
1292         },
1293         {1, 1, 3, 0,            /* 0xaf */
1294                 {{0, 3},
1295                 {5, 5},
1296                 {7, 7},
1297                 {0, 0}
1298                 }
1299         },
1300         {0, 1, 2, 0,            /* 0xb0 */
1301                 {{4, 5},
1302                 {7, 7},
1303                 {0, 0},
1304                 {0, 0}
1305                 }
1306         },
1307         {1, 1, 3, 0,            /* 0xb1 */
1308                 {{0, 0},
1309                 {4, 5},
1310                 {7, 7},
1311                 {0, 0}
1312                 }
1313         },
1314         {0, 1, 3, 0,            /* 0xb2 */
1315                 {{1, 1},
1316                 {4, 5},
1317                 {7, 7},
1318                 {0, 0}
1319                 }
1320         },
1321         {1, 1, 3, 0,            /* 0xb3 */
1322                 {{0, 1},
1323                 {4, 5},
1324                 {7, 7},
1325                 {0, 0}
1326                 }
1327         },
1328         {0, 1, 3, 0,            /* 0xb4 */
1329                 {{2, 2},
1330                 {4, 5},
1331                 {7, 7},
1332                 {0, 0}
1333                 }
1334         },
1335         {1, 1, 4, 0,            /* 0xb5 */
1336                 {{0, 0},
1337                 {2, 2},
1338                 {4, 5},
1339                 {7, 7}
1340                 }
1341         },
1342         {0, 1, 3, 0,            /* 0xb6 */
1343                 {{1, 2},
1344                 {4, 5},
1345                 {7, 7},
1346                 {0, 0}
1347                 }
1348         },
1349         {1, 1, 3, 0,            /* 0xb7 */
1350                 {{0, 2},
1351                 {4, 5},
1352                 {7, 7},
1353                 {0, 0}
1354                 }
1355         },
1356         {0, 1, 2, 0,            /* 0xb8 */
1357                 {{3, 5},
1358                 {7, 7},
1359                 {0, 0},
1360                 {0, 0}
1361                 }
1362         },
1363         {1, 1, 3, 0,            /* 0xb9 */
1364                 {{0, 0},
1365                 {3, 5},
1366                 {7, 7},
1367                 {0, 0}
1368                 }
1369         },
1370         {0, 1, 3, 0,            /* 0xba */
1371                 {{1, 1},
1372                 {3, 5},
1373                 {7, 7},
1374                 {0, 0}
1375                 }
1376         },
1377         {1, 1, 3, 0,            /* 0xbb */
1378                 {{0, 1},
1379                 {3, 5},
1380                 {7, 7},
1381                 {0, 0}
1382                 }
1383         },
1384         {0, 1, 2, 0,            /* 0xbc */
1385                 {{2, 5},
1386                 {7, 7},
1387                 {0, 0},
1388                 {0, 0}
1389                 }
1390         },
1391         {1, 1, 3, 0,            /* 0xbd */
1392                 {{0, 0},
1393                 {2, 5},
1394                 {7, 7},
1395                 {0, 0}
1396                 }
1397         },
1398         {0, 1, 2, 0,            /* 0xbe */
1399                 {{1, 5},
1400                 {7, 7},
1401                 {0, 0},
1402                 {0, 0}
1403                 }
1404         },
1405         {1, 1, 2, 0,            /* 0xbf */
1406                 {{0, 5},
1407                 {7, 7},
1408                 {0, 0},
1409                 {0, 0}
1410                 }
1411         },
1412         {0, 1, 1, 0,            /* 0xc0 */
1413                 {{6, 7},
1414                 {0, 0},
1415                 {0, 0},
1416                 {0, 0}
1417                 }
1418         },
1419         {1, 1, 2, 0,            /* 0xc1 */
1420                 {{0, 0},
1421                 {6, 7},
1422                 {0, 0},
1423                 {0, 0}
1424                 }
1425         },
1426         {0, 1, 2, 0,            /* 0xc2 */
1427                 {{1, 1},
1428                 {6, 7},
1429                 {0, 0},
1430                 {0, 0}
1431                 }
1432         },
1433         {1, 1, 2, 0,            /* 0xc3 */
1434                 {{0, 1},
1435                 {6, 7},
1436                 {0, 0},
1437                 {0, 0}
1438                 }
1439         },
1440         {0, 1, 2, 0,            /* 0xc4 */
1441                 {{2, 2},
1442                 {6, 7},
1443                 {0, 0},
1444                 {0, 0}
1445                 }
1446         },
1447         {1, 1, 3, 0,            /* 0xc5 */
1448                 {{0, 0},
1449                 {2, 2},
1450                 {6, 7},
1451                 {0, 0}
1452                 }
1453         },
1454         {0, 1, 2, 0,            /* 0xc6 */
1455                 {{1, 2},
1456                 {6, 7},
1457                 {0, 0},
1458                 {0, 0}
1459                 }
1460         },
1461         {1, 1, 2, 0,            /* 0xc7 */
1462                 {{0, 2},
1463                 {6, 7},
1464                 {0, 0},
1465                 {0, 0}
1466                 }
1467         },
1468         {0, 1, 2, 0,            /* 0xc8 */
1469                 {{3, 3},
1470                 {6, 7},
1471                 {0, 0},
1472                 {0, 0}
1473                 }
1474         },
1475         {1, 1, 3, 0,            /* 0xc9 */
1476                 {{0, 0},
1477                 {3, 3},
1478                 {6, 7},
1479                 {0, 0}
1480                 }
1481         },
1482         {0, 1, 3, 0,            /* 0xca */
1483                 {{1, 1},
1484                 {3, 3},
1485                 {6, 7},
1486                 {0, 0}
1487                 }
1488         },
1489         {1, 1, 3, 0,            /* 0xcb */
1490                 {{0, 1},
1491                 {3, 3},
1492                 {6, 7},
1493                 {0, 0}
1494                 }
1495         },
1496         {0, 1, 2, 0,            /* 0xcc */
1497                 {{2, 3},
1498                 {6, 7},
1499                 {0, 0},
1500                 {0, 0}
1501                 }
1502         },
1503         {1, 1, 3, 0,            /* 0xcd */
1504                 {{0, 0},
1505                 {2, 3},
1506                 {6, 7},
1507                 {0, 0}
1508                 }
1509         },
1510         {0, 1, 2, 0,            /* 0xce */
1511                 {{1, 3},
1512                 {6, 7},
1513                 {0, 0},
1514                 {0, 0}
1515                 }
1516         },
1517         {1, 1, 2, 0,            /* 0xcf */
1518                 {{0, 3},
1519                 {6, 7},
1520                 {0, 0},
1521                 {0, 0}
1522                 }
1523         },
1524         {0, 1, 2, 0,            /* 0xd0 */
1525                 {{4, 4},
1526                 {6, 7},
1527                 {0, 0},
1528                 {0, 0}
1529                 }
1530         },
1531         {1, 1, 3, 0,            /* 0xd1 */
1532                 {{0, 0},
1533                 {4, 4},
1534                 {6, 7},
1535                 {0, 0}
1536                 }
1537         },
1538         {0, 1, 3, 0,            /* 0xd2 */
1539                 {{1, 1},
1540                 {4, 4},
1541                 {6, 7},
1542                 {0, 0}
1543                 }
1544         },
1545         {1, 1, 3, 0,            /* 0xd3 */
1546                 {{0, 1},
1547                 {4, 4},
1548                 {6, 7},
1549                 {0, 0}
1550                 }
1551         },
1552         {0, 1, 3, 0,            /* 0xd4 */
1553                 {{2, 2},
1554                 {4, 4},
1555                 {6, 7},
1556                 {0, 0}
1557                 }
1558         },
1559         {1, 1, 4, 0,            /* 0xd5 */
1560                 {{0, 0},
1561                 {2, 2},
1562                 {4, 4},
1563                 {6, 7}
1564                 }
1565         },
1566         {0, 1, 3, 0,            /* 0xd6 */
1567                 {{1, 2},
1568                 {4, 4},
1569                 {6, 7},
1570                 {0, 0}
1571                 }
1572         },
1573         {1, 1, 3, 0,            /* 0xd7 */
1574                 {{0, 2},
1575                 {4, 4},
1576                 {6, 7},
1577                 {0, 0}
1578                 }
1579         },
1580         {0, 1, 2, 0,            /* 0xd8 */
1581                 {{3, 4},
1582                 {6, 7},
1583                 {0, 0},
1584                 {0, 0}
1585                 }
1586         },
1587         {1, 1, 3, 0,            /* 0xd9 */
1588                 {{0, 0},
1589                 {3, 4},
1590                 {6, 7},
1591                 {0, 0}
1592                 }
1593         },
1594         {0, 1, 3, 0,            /* 0xda */
1595                 {{1, 1},
1596                 {3, 4},
1597                 {6, 7},
1598                 {0, 0}
1599                 }
1600         },
1601         {1, 1, 3, 0,            /* 0xdb */
1602                 {{0, 1},
1603                 {3, 4},
1604                 {6, 7},
1605                 {0, 0}
1606                 }
1607         },
1608         {0, 1, 2, 0,            /* 0xdc */
1609                 {{2, 4},
1610                 {6, 7},
1611                 {0, 0},
1612                 {0, 0}
1613                 }
1614         },
1615         {1, 1, 3, 0,            /* 0xdd */
1616                 {{0, 0},
1617                 {2, 4},
1618                 {6, 7},
1619                 {0, 0}
1620                 }
1621         },
1622         {0, 1, 2, 0,            /* 0xde */
1623                 {{1, 4},
1624                 {6, 7},
1625                 {0, 0},
1626                 {0, 0}
1627                 }
1628         },
1629         {1, 1, 2, 0,            /* 0xdf */
1630                 {{0, 4},
1631                 {6, 7},
1632                 {0, 0},
1633                 {0, 0}
1634                 }
1635         },
1636         {0, 1, 1, 0,            /* 0xe0 */
1637                 {{5, 7},
1638                 {0, 0},
1639                 {0, 0},
1640                 {0, 0}
1641                 }
1642         },
1643         {1, 1, 2, 0,            /* 0xe1 */
1644                 {{0, 0},
1645                 {5, 7},
1646                 {0, 0},
1647                 {0, 0}
1648                 }
1649         },
1650         {0, 1, 2, 0,            /* 0xe2 */
1651                 {{1, 1},
1652                 {5, 7},
1653                 {0, 0},
1654                 {0, 0}
1655                 }
1656         },
1657         {1, 1, 2, 0,            /* 0xe3 */
1658                 {{0, 1},
1659                 {5, 7},
1660                 {0, 0},
1661                 {0, 0}
1662                 }
1663         },
1664         {0, 1, 2, 0,            /* 0xe4 */
1665                 {{2, 2},
1666                 {5, 7},
1667                 {0, 0},
1668                 {0, 0}
1669                 }
1670         },
1671         {1, 1, 3, 0,            /* 0xe5 */
1672                 {{0, 0},
1673                 {2, 2},
1674                 {5, 7},
1675                 {0, 0}
1676                 }
1677         },
1678         {0, 1, 2, 0,            /* 0xe6 */
1679                 {{1, 2},
1680                 {5, 7},
1681                 {0, 0},
1682                 {0, 0}
1683                 }
1684         },
1685         {1, 1, 2, 0,            /* 0xe7 */
1686                 {{0, 2},
1687                 {5, 7},
1688                 {0, 0},
1689                 {0, 0}
1690                 }
1691         },
1692         {0, 1, 2, 0,            /* 0xe8 */
1693                 {{3, 3},
1694                 {5, 7},
1695                 {0, 0},
1696                 {0, 0}
1697                 }
1698         },
1699         {1, 1, 3, 0,            /* 0xe9 */
1700                 {{0, 0},
1701                 {3, 3},
1702                 {5, 7},
1703                 {0, 0}
1704                 }
1705         },
1706         {0, 1, 3, 0,            /* 0xea */
1707                 {{1, 1},
1708                 {3, 3},
1709                 {5, 7},
1710                 {0, 0}
1711                 }
1712         },
1713         {1, 1, 3, 0,            /* 0xeb */
1714                 {{0, 1},
1715                 {3, 3},
1716                 {5, 7},
1717                 {0, 0}
1718                 }
1719         },
1720         {0, 1, 2, 0,            /* 0xec */
1721                 {{2, 3},
1722                 {5, 7},
1723                 {0, 0},
1724                 {0, 0}
1725                 }
1726         },
1727         {1, 1, 3, 0,            /* 0xed */
1728                 {{0, 0},
1729                 {2, 3},
1730                 {5, 7},
1731                 {0, 0}
1732                 }
1733         },
1734         {0, 1, 2, 0,            /* 0xee */
1735                 {{1, 3},
1736                 {5, 7},
1737                 {0, 0},
1738                 {0, 0}
1739                 }
1740         },
1741         {1, 1, 2, 0,            /* 0xef */
1742                 {{0, 3},
1743                 {5, 7},
1744                 {0, 0},
1745                 {0, 0}
1746                 }
1747         },
1748         {0, 1, 1, 0,            /* 0xf0 */
1749                 {{4, 7},
1750                 {0, 0},
1751                 {0, 0},
1752                 {0, 0}
1753                 }
1754         },
1755         {1, 1, 2, 0,            /* 0xf1 */
1756                 {{0, 0},
1757                 {4, 7},
1758                 {0, 0},
1759                 {0, 0}
1760                 }
1761         },
1762         {0, 1, 2, 0,            /* 0xf2 */
1763                 {{1, 1},
1764                 {4, 7},
1765                 {0, 0},
1766                 {0, 0}
1767                 }
1768         },
1769         {1, 1, 2, 0,            /* 0xf3 */
1770                 {{0, 1},
1771                 {4, 7},
1772                 {0, 0},
1773                 {0, 0}
1774                 }
1775         },
1776         {0, 1, 2, 0,            /* 0xf4 */
1777                 {{2, 2},
1778                 {4, 7},
1779                 {0, 0},
1780                 {0, 0}
1781                 }
1782         },
1783         {1, 1, 3, 0,            /* 0xf5 */
1784                 {{0, 0},
1785                 {2, 2},
1786                 {4, 7},
1787                 {0, 0}
1788                 }
1789         },
1790         {0, 1, 2, 0,            /* 0xf6 */
1791                 {{1, 2},
1792                 {4, 7},
1793                 {0, 0},
1794                 {0, 0}
1795                 }
1796         },
1797         {1, 1, 2, 0,            /* 0xf7 */
1798                 {{0, 2},
1799                 {4, 7},
1800                 {0, 0},
1801                 {0, 0}
1802                 }
1803         },
1804         {0, 1, 1, 0,            /* 0xf8 */
1805                 {{3, 7},
1806                 {0, 0},
1807                 {0, 0},
1808                 {0, 0}
1809                 }
1810         },
1811         {1, 1, 2, 0,            /* 0xf9 */
1812                 {{0, 0},
1813                 {3, 7},
1814                 {0, 0},
1815                 {0, 0}
1816                 }
1817         },
1818         {0, 1, 2, 0,            /* 0xfa */
1819                 {{1, 1},
1820                 {3, 7},
1821                 {0, 0},
1822                 {0, 0}
1823                 }
1824         },
1825         {1, 1, 2, 0,            /* 0xfb */
1826                 {{0, 1},
1827                 {3, 7},
1828                 {0, 0},
1829                 {0, 0}
1830                 }
1831         },
1832         {0, 1, 1, 0,            /* 0xfc */
1833                 {{2, 7},
1834                 {0, 0},
1835                 {0, 0},
1836                 {0, 0}
1837                 }
1838         },
1839         {1, 1, 2, 0,            /* 0xfd */
1840                 {{0, 0},
1841                 {2, 7},
1842                 {0, 0},
1843                 {0, 0}
1844                 }
1845         },
1846         {0, 1, 1, 0,            /* 0xfe */
1847                 {{1, 7},
1848                 {0, 0},
1849                 {0, 0},
1850                 {0, 0}
1851                 }
1852         },
1853         {1, 1, 1, 0,            /* 0xff */
1854                 {{0, 7},
1855                 {0, 0},
1856                 {0, 0},
1857                 {0, 0}
1858                 }
1859         }
1860 };
1861
1862
1863 int
1864 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1865     int ipv4_addr_legal,
1866     int ipv6_addr_legal,
1867     int loopback_scope,
1868     int ipv4_local_scope,
1869     int local_scope,
1870     int site_scope,
1871     int do_update)
1872 {
1873         if ((loopback_scope == 0) &&
1874             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1875                 /*
1876                  * skip loopback if not in scope *
1877                  */
1878                 return (0);
1879         }
1880         switch (ifa->address.sa.sa_family) {
1881         case AF_INET:
1882                 if (ipv4_addr_legal) {
1883                         struct sockaddr_in *sin;
1884
1885                         sin = (struct sockaddr_in *)&ifa->address.sin;
1886                         if (sin->sin_addr.s_addr == 0) {
1887                                 /* not in scope , unspecified */
1888                                 return (0);
1889                         }
1890                         if ((ipv4_local_scope == 0) &&
1891                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1892                                 /* private address not in scope */
1893                                 return (0);
1894                         }
1895                 } else {
1896                         return (0);
1897                 }
1898                 break;
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1941 {
1942         struct sctp_paramhdr *parmh;
1943         struct mbuf *mret;
1944         int len;
1945
1946         if (ifa->address.sa.sa_family == AF_INET) {
1947                 len = sizeof(struct sctp_ipv4addr_param);
1948         } else if (ifa->address.sa.sa_family == AF_INET6) {
1949                 len = sizeof(struct sctp_ipv6addr_param);
1950         } else {
1951                 /* unknown type */
1952                 return (m);
1953         }
1954         if (M_TRAILINGSPACE(m) >= len) {
1955                 /* easy side we just drop it on the end */
1956                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1957                 mret = m;
1958         } else {
1959                 /* Need more space */
1960                 mret = m;
1961                 while (SCTP_BUF_NEXT(mret) != NULL) {
1962                         mret = SCTP_BUF_NEXT(mret);
1963                 }
1964                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1965                 if (SCTP_BUF_NEXT(mret) == NULL) {
1966                         /* We are hosed, can't add more addresses */
1967                         return (m);
1968                 }
1969                 mret = SCTP_BUF_NEXT(mret);
1970                 parmh = mtod(mret, struct sctp_paramhdr *);
1971         }
1972         /* now add the parameter */
1973         switch (ifa->address.sa.sa_family) {
1974         case AF_INET:
1975                 {
1976                         struct sctp_ipv4addr_param *ipv4p;
1977                         struct sockaddr_in *sin;
1978
1979                         sin = (struct sockaddr_in *)&ifa->address.sin;
1980                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1981                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1982                         parmh->param_length = htons(len);
1983                         ipv4p->addr = sin->sin_addr.s_addr;
1984                         SCTP_BUF_LEN(mret) += len;
1985                         break;
1986                 }
1987 #ifdef INET6
1988         case AF_INET6:
1989                 {
1990                         struct sctp_ipv6addr_param *ipv6p;
1991                         struct sockaddr_in6 *sin6;
1992
1993                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1994                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1995                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1996                         parmh->param_length = htons(len);
1997                         memcpy(ipv6p->addr, &sin6->sin6_addr,
1998                             sizeof(ipv6p->addr));
1999                         /* clear embedded scope in the address */
2000                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2001                         SCTP_BUF_LEN(mret) += len;
2002                         break;
2003                 }
2004 #endif
2005         default:
2006                 return (m);
2007         }
2008         return (mret);
2009 }
2010
2011
2012 struct mbuf *
2013 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2014     struct mbuf *m_at, int cnt_inits_to)
2015 {
2016         struct sctp_vrf *vrf = NULL;
2017         int cnt, limit_out = 0, total_count;
2018         uint32_t vrf_id;
2019
2020         vrf_id = inp->def_vrf_id;
2021         SCTP_IPI_ADDR_RLOCK();
2022         vrf = sctp_find_vrf(vrf_id);
2023         if (vrf == NULL) {
2024                 SCTP_IPI_ADDR_RUNLOCK();
2025                 return (m_at);
2026         }
2027         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2028                 struct sctp_ifa *sctp_ifap;
2029                 struct sctp_ifn *sctp_ifnp;
2030
2031                 cnt = cnt_inits_to;
2032                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2033                         limit_out = 1;
2034                         cnt = SCTP_ADDRESS_LIMIT;
2035                         goto skip_count;
2036                 }
2037                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2038                         if ((scope->loopback_scope == 0) &&
2039                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2040                                 /*
2041                                  * Skip loopback devices if loopback_scope
2042                                  * not set
2043                                  */
2044                                 continue;
2045                         }
2046                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2047                                 if (sctp_is_address_in_scope(sctp_ifap,
2048                                     scope->ipv4_addr_legal,
2049                                     scope->ipv6_addr_legal,
2050                                     scope->loopback_scope,
2051                                     scope->ipv4_local_scope,
2052                                     scope->local_scope,
2053                                     scope->site_scope, 1) == 0) {
2054                                         continue;
2055                                 }
2056                                 cnt++;
2057                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2058                                         break;
2059                                 }
2060                         }
2061                         if (cnt > SCTP_ADDRESS_LIMIT) {
2062                                 break;
2063                         }
2064                 }
2065 skip_count:
2066                 if (cnt > 1) {
2067                         total_count = 0;
2068                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2069                                 cnt = 0;
2070                                 if ((scope->loopback_scope == 0) &&
2071                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2072                                         /*
2073                                          * Skip loopback devices if
2074                                          * loopback_scope not set
2075                                          */
2076                                         continue;
2077                                 }
2078                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2079                                         if (sctp_is_address_in_scope(sctp_ifap,
2080                                             scope->ipv4_addr_legal,
2081                                             scope->ipv6_addr_legal,
2082                                             scope->loopback_scope,
2083                                             scope->ipv4_local_scope,
2084                                             scope->local_scope,
2085                                             scope->site_scope, 0) == 0) {
2086                                                 continue;
2087                                         }
2088                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2089                                         if (limit_out) {
2090                                                 cnt++;
2091                                                 total_count++;
2092                                                 if (cnt >= 2) {
2093                                                         /*
2094                                                          * two from each
2095                                                          * address
2096                                                          */
2097                                                         break;
2098                                                 }
2099                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2100                                                         /* No more addresses */
2101                                                         break;
2102                                                 }
2103                                         }
2104                                 }
2105                         }
2106                 }
2107         } else {
2108                 struct sctp_laddr *laddr;
2109
2110                 cnt = cnt_inits_to;
2111                 /* First, how many ? */
2112                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2113                         if (laddr->ifa == NULL) {
2114                                 continue;
2115                         }
2116                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2117                                 /*
2118                                  * Address being deleted by the system, dont
2119                                  * list.
2120                                  */
2121                                 continue;
2122                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2123                                 /*
2124                                  * Address being deleted on this ep don't
2125                                  * list.
2126                                  */
2127                                 continue;
2128                         }
2129                         if (sctp_is_address_in_scope(laddr->ifa,
2130                             scope->ipv4_addr_legal,
2131                             scope->ipv6_addr_legal,
2132                             scope->loopback_scope,
2133                             scope->ipv4_local_scope,
2134                             scope->local_scope,
2135                             scope->site_scope, 1) == 0) {
2136                                 continue;
2137                         }
2138                         cnt++;
2139                 }
2140                 if (cnt > SCTP_ADDRESS_LIMIT) {
2141                         limit_out = 1;
2142                 }
2143                 /*
2144                  * To get through a NAT we only list addresses if we have
2145                  * more than one. That way if you just bind a single address
2146                  * we let the source of the init dictate our address.
2147                  */
2148                 if (cnt > 1) {
2149                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2150                                 cnt = 0;
2151                                 if (laddr->ifa == NULL) {
2152                                         continue;
2153                                 }
2154                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2155                                         continue;
2156
2157                                 if (sctp_is_address_in_scope(laddr->ifa,
2158                                     scope->ipv4_addr_legal,
2159                                     scope->ipv6_addr_legal,
2160                                     scope->loopback_scope,
2161                                     scope->ipv4_local_scope,
2162                                     scope->local_scope,
2163                                     scope->site_scope, 0) == 0) {
2164                                         continue;
2165                                 }
2166                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2167                                 cnt++;
2168                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2169                                         break;
2170                                 }
2171                         }
2172                 }
2173         }
2174         SCTP_IPI_ADDR_RUNLOCK();
2175         return (m_at);
2176 }
2177
2178 static struct sctp_ifa *
2179 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2180     uint8_t dest_is_loop,
2181     uint8_t dest_is_priv,
2182     sa_family_t fam)
2183 {
2184         uint8_t dest_is_global = 0;
2185
2186         /* dest_is_priv is true if destination is a private address */
2187         /* dest_is_loop is true if destination is a loopback addresses */
2188
2189         /*
2190          * Here we determine if its a preferred address. A preferred address
2191          * means it is the same scope or higher scope then the destination.
2192          * L = loopback, P = private, G = global
2193          * ----------------------------------------- src    |  dest | result
2194          * ---------------------------------------- L     |    L  |    yes
2195          * ----------------------------------------- P     |    L  |
2196          * yes-v4 no-v6 ----------------------------------------- G     |
2197          * L  |    yes-v4 no-v6 ----------------------------------------- L
2198          * |    P  |    no ----------------------------------------- P     |
2199          * P  |    yes ----------------------------------------- G     |
2200          * P  |    no ----------------------------------------- L     |    G
2201          * |    no ----------------------------------------- P     |    G  |
2202          * no ----------------------------------------- G     |    G  |
2203          * yes -----------------------------------------
2204          */
2205
2206         if (ifa->address.sa.sa_family != fam) {
2207                 /* forget mis-matched family */
2208                 return (NULL);
2209         }
2210         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2211                 dest_is_global = 1;
2212         }
2213         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2214         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2215         /* Ok the address may be ok */
2216         if (fam == AF_INET6) {
2217                 /* ok to use deprecated addresses? no lets not! */
2218                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2219                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2220                         return (NULL);
2221                 }
2222                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2223                         if (dest_is_loop) {
2224                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2225                                 return (NULL);
2226                         }
2227                 }
2228                 if (ifa->src_is_glob) {
2229                         if (dest_is_loop) {
2230                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2231                                 return (NULL);
2232                         }
2233                 }
2234         }
2235         /*
2236          * Now that we know what is what, implement or table this could in
2237          * theory be done slicker (it used to be), but this is
2238          * straightforward and easier to validate :-)
2239          */
2240         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2241             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2242         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2243             dest_is_loop, dest_is_priv, dest_is_global);
2244
2245         if ((ifa->src_is_loop) && (dest_is_priv)) {
2246                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2247                 return (NULL);
2248         }
2249         if ((ifa->src_is_glob) && (dest_is_priv)) {
2250                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2251                 return (NULL);
2252         }
2253         if ((ifa->src_is_loop) && (dest_is_global)) {
2254                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2255                 return (NULL);
2256         }
2257         if ((ifa->src_is_priv) && (dest_is_global)) {
2258                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2259                 return (NULL);
2260         }
2261         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2262         /* its a preferred address */
2263         return (ifa);
2264 }
2265
2266 static struct sctp_ifa *
2267 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2268     uint8_t dest_is_loop,
2269     uint8_t dest_is_priv,
2270     sa_family_t fam)
2271 {
2272         uint8_t dest_is_global = 0;
2273
2274
2275         /*
2276          * Here we determine if its a acceptable address. A acceptable
2277          * address means it is the same scope or higher scope but we can
2278          * allow for NAT which means its ok to have a global dest and a
2279          * private src.
2280          *
2281          * L = loopback, P = private, G = global
2282          * ----------------------------------------- src    |  dest | result
2283          * ----------------------------------------- L     |   L   |    yes
2284          * ----------------------------------------- P     |   L   |
2285          * yes-v4 no-v6 ----------------------------------------- G     |
2286          * L   |    yes ----------------------------------------- L     |
2287          * P   |    no ----------------------------------------- P     |   P
2288          * |    yes ----------------------------------------- G     |   P
2289          * |    yes - May not work -----------------------------------------
2290          * L     |   G   |    no ----------------------------------------- P
2291          * |   G   |    yes - May not work
2292          * ----------------------------------------- G     |   G   |    yes
2293          * -----------------------------------------
2294          */
2295
2296         if (ifa->address.sa.sa_family != fam) {
2297                 /* forget non matching family */
2298                 return (NULL);
2299         }
2300         /* Ok the address may be ok */
2301         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2302                 dest_is_global = 1;
2303         }
2304         if (fam == AF_INET6) {
2305                 /* ok to use deprecated addresses? */
2306                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2307                         return (NULL);
2308                 }
2309                 if (ifa->src_is_priv) {
2310                         /* Special case, linklocal to loop */
2311                         if (dest_is_loop)
2312                                 return (NULL);
2313                 }
2314         }
2315         /*
2316          * Now that we know what is what, implement our table. This could in
2317          * theory be done slicker (it used to be), but this is
2318          * straightforward and easier to validate :-)
2319          */
2320         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2321                 return (NULL);
2322         }
2323         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2324                 return (NULL);
2325         }
2326         /* its an acceptable address */
2327         return (ifa);
2328 }
2329
2330 int
2331 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2332 {
2333         struct sctp_laddr *laddr;
2334
2335         if (stcb == NULL) {
2336                 /* There are no restrictions, no TCB :-) */
2337                 return (0);
2338         }
2339         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2340                 if (laddr->ifa == NULL) {
2341                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2342                             __FUNCTION__);
2343                         continue;
2344                 }
2345                 if (laddr->ifa == ifa) {
2346                         /* Yes it is on the list */
2347                         return (1);
2348                 }
2349         }
2350         return (0);
2351 }
2352
2353
2354 int
2355 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2356 {
2357         struct sctp_laddr *laddr;
2358
2359         if (ifa == NULL)
2360                 return (0);
2361         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2362                 if (laddr->ifa == NULL) {
2363                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2364                             __FUNCTION__);
2365                         continue;
2366                 }
2367                 if ((laddr->ifa == ifa) && laddr->action == 0)
2368                         /* same pointer */
2369                         return (1);
2370         }
2371         return (0);
2372 }
2373
2374
2375
2376 static struct sctp_ifa *
2377 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2378     sctp_route_t * ro,
2379     uint32_t vrf_id,
2380     int non_asoc_addr_ok,
2381     uint8_t dest_is_priv,
2382     uint8_t dest_is_loop,
2383     sa_family_t fam)
2384 {
2385         struct sctp_laddr *laddr, *starting_point;
2386         void *ifn;
2387         int resettotop = 0;
2388         struct sctp_ifn *sctp_ifn;
2389         struct sctp_ifa *sctp_ifa, *sifa;
2390         struct sctp_vrf *vrf;
2391         uint32_t ifn_index;
2392
2393         vrf = sctp_find_vrf(vrf_id);
2394         if (vrf == NULL)
2395                 return (NULL);
2396
2397         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2398         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2399         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2400         /*
2401          * first question, is the ifn we will emit on in our list, if so, we
2402          * want such an address. Note that we first looked for a preferred
2403          * address.
2404          */
2405         if (sctp_ifn) {
2406                 /* is a preferred one on the interface we route out? */
2407                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2408                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2409                             (non_asoc_addr_ok == 0))
2410                                 continue;
2411                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2412                             dest_is_loop,
2413                             dest_is_priv, fam);
2414                         if (sifa == NULL)
2415                                 continue;
2416                         if (sctp_is_addr_in_ep(inp, sifa)) {
2417                                 atomic_add_int(&sifa->refcount, 1);
2418                                 return (sifa);
2419                         }
2420                 }
2421         }
2422         /*
2423          * ok, now we now need to find one on the list of the addresses. We
2424          * can't get one on the emitting interface so let's find first a
2425          * preferred one. If not that an acceptable one otherwise... we
2426          * return NULL.
2427          */
2428         starting_point = inp->next_addr_touse;
2429 once_again:
2430         if (inp->next_addr_touse == NULL) {
2431                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2432                 resettotop = 1;
2433         }
2434         for (laddr = inp->next_addr_touse; laddr;
2435             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2436                 if (laddr->ifa == NULL) {
2437                         /* address has been removed */
2438                         continue;
2439                 }
2440                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2441                         /* address is being deleted */
2442                         continue;
2443                 }
2444                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2445                     dest_is_priv, fam);
2446                 if (sifa == NULL)
2447                         continue;
2448                 atomic_add_int(&sifa->refcount, 1);
2449                 return (sifa);
2450         }
2451         if (resettotop == 0) {
2452                 inp->next_addr_touse = NULL;
2453                 goto once_again;
2454         }
2455         inp->next_addr_touse = starting_point;
2456         resettotop = 0;
2457 once_again_too:
2458         if (inp->next_addr_touse == NULL) {
2459                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2460                 resettotop = 1;
2461         }
2462         /* ok, what about an acceptable address in the inp */
2463         for (laddr = inp->next_addr_touse; laddr;
2464             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2465                 if (laddr->ifa == NULL) {
2466                         /* address has been removed */
2467                         continue;
2468                 }
2469                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2470                         /* address is being deleted */
2471                         continue;
2472                 }
2473                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2474                     dest_is_priv, fam);
2475                 if (sifa == NULL)
2476                         continue;
2477                 atomic_add_int(&sifa->refcount, 1);
2478                 return (sifa);
2479         }
2480         if (resettotop == 0) {
2481                 inp->next_addr_touse = NULL;
2482                 goto once_again_too;
2483         }
2484         /*
2485          * no address bound can be a source for the destination we are in
2486          * trouble
2487          */
2488         return (NULL);
2489 }
2490
2491
2492
2493 static struct sctp_ifa *
2494 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2495     struct sctp_tcb *stcb,
2496     struct sctp_nets *net,
2497     sctp_route_t * ro,
2498     uint32_t vrf_id,
2499     uint8_t dest_is_priv,
2500     uint8_t dest_is_loop,
2501     int non_asoc_addr_ok,
2502     sa_family_t fam)
2503 {
2504         struct sctp_laddr *laddr, *starting_point;
2505         void *ifn;
2506         struct sctp_ifn *sctp_ifn;
2507         struct sctp_ifa *sctp_ifa, *sifa;
2508         uint8_t start_at_beginning = 0;
2509         struct sctp_vrf *vrf;
2510         uint32_t ifn_index;
2511
2512         /*
2513          * first question, is the ifn we will emit on in our list, if so, we
2514          * want that one.
2515          */
2516         vrf = sctp_find_vrf(vrf_id);
2517         if (vrf == NULL)
2518                 return (NULL);
2519
2520         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2521         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2522         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2523
2524         /*
2525          * first question, is the ifn we will emit on in our list?  If so,
2526          * we want that one. First we look for a preferred. Second, we go
2527          * for an acceptable.
2528          */
2529         if (sctp_ifn) {
2530                 /* first try for a preferred address on the ep */
2531                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2532                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2533                                 continue;
2534                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2535                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2536                                 if (sifa == NULL)
2537                                         continue;
2538                                 if (((non_asoc_addr_ok == 0) &&
2539                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2540                                     (non_asoc_addr_ok &&
2541                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2542                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2543                                         /* on the no-no list */
2544                                         continue;
2545                                 }
2546                                 atomic_add_int(&sifa->refcount, 1);
2547                                 return (sifa);
2548                         }
2549                 }
2550                 /* next try for an acceptable address on the ep */
2551                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2552                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2553                                 continue;
2554                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2555                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2556                                 if (sifa == NULL)
2557                                         continue;
2558                                 if (((non_asoc_addr_ok == 0) &&
2559                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2560                                     (non_asoc_addr_ok &&
2561                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2562                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2563                                         /* on the no-no list */
2564                                         continue;
2565                                 }
2566                                 atomic_add_int(&sifa->refcount, 1);
2567                                 return (sifa);
2568                         }
2569                 }
2570
2571         }
2572         /*
2573          * if we can't find one like that then we must look at all addresses
2574          * bound to pick one at first preferable then secondly acceptable.
2575          */
2576         starting_point = stcb->asoc.last_used_address;
2577 sctp_from_the_top:
2578         if (stcb->asoc.last_used_address == NULL) {
2579                 start_at_beginning = 1;
2580                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2581         }
2582         /* search beginning with the last used address */
2583         for (laddr = stcb->asoc.last_used_address; laddr;
2584             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2585                 if (laddr->ifa == NULL) {
2586                         /* address has been removed */
2587                         continue;
2588                 }
2589                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2590                         /* address is being deleted */
2591                         continue;
2592                 }
2593                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2594                 if (sifa == NULL)
2595                         continue;
2596                 if (((non_asoc_addr_ok == 0) &&
2597                     (sctp_is_addr_restricted(stcb, sifa))) ||
2598                     (non_asoc_addr_ok &&
2599                     (sctp_is_addr_restricted(stcb, sifa)) &&
2600                     (!sctp_is_addr_pending(stcb, sifa)))) {
2601                         /* on the no-no list */
2602                         continue;
2603                 }
2604                 stcb->asoc.last_used_address = laddr;
2605                 atomic_add_int(&sifa->refcount, 1);
2606                 return (sifa);
2607         }
2608         if (start_at_beginning == 0) {
2609                 stcb->asoc.last_used_address = NULL;
2610                 goto sctp_from_the_top;
2611         }
2612         /* now try for any higher scope than the destination */
2613         stcb->asoc.last_used_address = starting_point;
2614         start_at_beginning = 0;
2615 sctp_from_the_top2:
2616         if (stcb->asoc.last_used_address == NULL) {
2617                 start_at_beginning = 1;
2618                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2619         }
2620         /* search beginning with the last used address */
2621         for (laddr = stcb->asoc.last_used_address; laddr;
2622             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2623                 if (laddr->ifa == NULL) {
2624                         /* address has been removed */
2625                         continue;
2626                 }
2627                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2628                         /* address is being deleted */
2629                         continue;
2630                 }
2631                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2632                     dest_is_priv, fam);
2633                 if (sifa == NULL)
2634                         continue;
2635                 if (((non_asoc_addr_ok == 0) &&
2636                     (sctp_is_addr_restricted(stcb, sifa))) ||
2637                     (non_asoc_addr_ok &&
2638                     (sctp_is_addr_restricted(stcb, sifa)) &&
2639                     (!sctp_is_addr_pending(stcb, sifa)))) {
2640                         /* on the no-no list */
2641                         continue;
2642                 }
2643                 stcb->asoc.last_used_address = laddr;
2644                 atomic_add_int(&sifa->refcount, 1);
2645                 return (sifa);
2646         }
2647         if (start_at_beginning == 0) {
2648                 stcb->asoc.last_used_address = NULL;
2649                 goto sctp_from_the_top2;
2650         }
2651         return (NULL);
2652 }
2653
2654 static struct sctp_ifa *
2655 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2656     struct sctp_tcb *stcb,
2657     int non_asoc_addr_ok,
2658     uint8_t dest_is_loop,
2659     uint8_t dest_is_priv,
2660     int addr_wanted,
2661     sa_family_t fam,
2662     sctp_route_t * ro
2663 )
2664 {
2665         struct sctp_ifa *ifa, *sifa;
2666         int num_eligible_addr = 0;
2667
2668 #ifdef INET6
2669         struct sockaddr_in6 sin6, lsa6;
2670
2671         if (fam == AF_INET6) {
2672                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2673                 (void)sa6_recoverscope(&sin6);
2674         }
2675 #endif                          /* INET6 */
2676         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2677                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2678                     (non_asoc_addr_ok == 0))
2679                         continue;
2680                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2681                     dest_is_priv, fam);
2682                 if (sifa == NULL)
2683                         continue;
2684 #ifdef INET6
2685                 if (fam == AF_INET6 &&
2686                     dest_is_loop &&
2687                     sifa->src_is_loop && sifa->src_is_priv) {
2688                         /*
2689                          * don't allow fe80::1 to be a src on loop ::1, we
2690                          * don't list it to the peer so we will get an
2691                          * abort.
2692                          */
2693                         continue;
2694                 }
2695                 if (fam == AF_INET6 &&
2696                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2697                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2698                         /*
2699                          * link-local <-> link-local must belong to the same
2700                          * scope.
2701                          */
2702                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2703                         (void)sa6_recoverscope(&lsa6);
2704                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2705                                 continue;
2706                         }
2707                 }
2708 #endif                          /* INET6 */
2709
2710                 /*
2711                  * Check if the IPv6 address matches to next-hop. In the
2712                  * mobile case, old IPv6 address may be not deleted from the
2713                  * interface. Then, the interface has previous and new
2714                  * addresses.  We should use one corresponding to the
2715                  * next-hop.  (by micchie)
2716                  */
2717 #ifdef INET6
2718                 if (stcb && fam == AF_INET6 &&
2719                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2720                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2721                             == 0) {
2722                                 continue;
2723                         }
2724                 }
2725 #endif
2726                 /* Avoid topologically incorrect IPv4 address */
2727                 if (stcb && fam == AF_INET &&
2728                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2729                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2730                                 continue;
2731                         }
2732                 }
2733                 if (stcb) {
2734                         if (((non_asoc_addr_ok == 0) &&
2735                             (sctp_is_addr_restricted(stcb, sifa))) ||
2736                             (non_asoc_addr_ok &&
2737                             (sctp_is_addr_restricted(stcb, sifa)) &&
2738                             (!sctp_is_addr_pending(stcb, sifa)))) {
2739                                 /*
2740                                  * It is restricted for some reason..
2741                                  * probably not yet added.
2742                                  */
2743                                 continue;
2744                         }
2745                 }
2746                 if (num_eligible_addr >= addr_wanted) {
2747                         return (sifa);
2748                 }
2749                 num_eligible_addr++;
2750         }
2751         return (NULL);
2752 }
2753
2754
2755 static int
2756 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2757     struct sctp_tcb *stcb,
2758     int non_asoc_addr_ok,
2759     uint8_t dest_is_loop,
2760     uint8_t dest_is_priv,
2761     sa_family_t fam)
2762 {
2763         struct sctp_ifa *ifa, *sifa;
2764         int num_eligible_addr = 0;
2765
2766         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2767                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2768                     (non_asoc_addr_ok == 0)) {
2769                         continue;
2770                 }
2771                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2772                     dest_is_priv, fam);
2773                 if (sifa == NULL) {
2774                         continue;
2775                 }
2776                 if (stcb) {
2777                         if (((non_asoc_addr_ok == 0) &&
2778                             (sctp_is_addr_restricted(stcb, sifa))) ||
2779                             (non_asoc_addr_ok &&
2780                             (sctp_is_addr_restricted(stcb, sifa)) &&
2781                             (!sctp_is_addr_pending(stcb, sifa)))) {
2782                                 /*
2783                                  * It is restricted for some reason..
2784                                  * probably not yet added.
2785                                  */
2786                                 continue;
2787                         }
2788                 }
2789                 num_eligible_addr++;
2790         }
2791         return (num_eligible_addr);
2792 }
2793
2794 static struct sctp_ifa *
2795 sctp_choose_boundall(struct sctp_inpcb *inp,
2796     struct sctp_tcb *stcb,
2797     struct sctp_nets *net,
2798     sctp_route_t * ro,
2799     uint32_t vrf_id,
2800     uint8_t dest_is_priv,
2801     uint8_t dest_is_loop,
2802     int non_asoc_addr_ok,
2803     sa_family_t fam)
2804 {
2805         int cur_addr_num = 0, num_preferred = 0;
2806         void *ifn;
2807         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2808         struct sctp_ifa *sctp_ifa, *sifa;
2809         uint32_t ifn_index;
2810         struct sctp_vrf *vrf;
2811
2812         /*-
2813          * For boundall we can use any address in the association.
2814          * If non_asoc_addr_ok is set we can use any address (at least in
2815          * theory). So we look for preferred addresses first. If we find one,
2816          * we use it. Otherwise we next try to get an address on the
2817          * interface, which we should be able to do (unless non_asoc_addr_ok
2818          * is false and we are routed out that way). In these cases where we
2819          * can't use the address of the interface we go through all the
2820          * ifn's looking for an address we can use and fill that in. Punting
2821          * means we send back address 0, which will probably cause problems
2822          * actually since then IP will fill in the address of the route ifn,
2823          * which means we probably already rejected it.. i.e. here comes an
2824          * abort :-<.
2825          */
2826         vrf = sctp_find_vrf(vrf_id);
2827         if (vrf == NULL)
2828                 return (NULL);
2829
2830         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2831         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2832         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2833         if (sctp_ifn == NULL) {
2834                 /* ?? We don't have this guy ?? */
2835                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2836                 goto bound_all_plan_b;
2837         }
2838         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2839             ifn_index, sctp_ifn->ifn_name);
2840
2841         if (net) {
2842                 cur_addr_num = net->indx_of_eligible_next_to_use;
2843         }
2844         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2845             stcb,
2846             non_asoc_addr_ok,
2847             dest_is_loop,
2848             dest_is_priv, fam);
2849         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2850             num_preferred, sctp_ifn->ifn_name);
2851         if (num_preferred == 0) {
2852                 /*
2853                  * no eligible addresses, we must use some other interface
2854                  * address if we can find one.
2855                  */
2856                 goto bound_all_plan_b;
2857         }
2858         /*
2859          * Ok we have num_eligible_addr set with how many we can use, this
2860          * may vary from call to call due to addresses being deprecated
2861          * etc..
2862          */
2863         if (cur_addr_num >= num_preferred) {
2864                 cur_addr_num = 0;
2865         }
2866         /*
2867          * select the nth address from the list (where cur_addr_num is the
2868          * nth) and 0 is the first one, 1 is the second one etc...
2869          */
2870         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2871
2872         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2873             dest_is_priv, cur_addr_num, fam, ro);
2874
2875         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2876         if (sctp_ifa) {
2877                 atomic_add_int(&sctp_ifa->refcount, 1);
2878                 if (net) {
2879                         /* save off where the next one we will want */
2880                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2881                 }
2882                 return (sctp_ifa);
2883         }
2884         /*
2885          * plan_b: Look at all interfaces and find a preferred address. If
2886          * no preferred fall through to plan_c.
2887          */
2888 bound_all_plan_b:
2889         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2890         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2891                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2892                     sctp_ifn->ifn_name);
2893                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2894                         /* wrong base scope */
2895                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2896                         continue;
2897                 }
2898                 if ((sctp_ifn == looked_at) && looked_at) {
2899                         /* already looked at this guy */
2900                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2901                         continue;
2902                 }
2903                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2904                     dest_is_loop, dest_is_priv, fam);
2905                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2906                     "Found ifn:%p %d preferred source addresses\n",
2907                     ifn, num_preferred);
2908                 if (num_preferred == 0) {
2909                         /* None on this interface. */
2910                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2911                         continue;
2912                 }
2913                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2914                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2915                     num_preferred, sctp_ifn, cur_addr_num);
2916
2917                 /*
2918                  * Ok we have num_eligible_addr set with how many we can
2919                  * use, this may vary from call to call due to addresses
2920                  * being deprecated etc..
2921                  */
2922                 if (cur_addr_num >= num_preferred) {
2923                         cur_addr_num = 0;
2924                 }
2925                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2926                     dest_is_priv, cur_addr_num, fam, ro);
2927                 if (sifa == NULL)
2928                         continue;
2929                 if (net) {
2930                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2931                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2932                             cur_addr_num);
2933                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2934                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2935                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2936                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2937                 }
2938                 atomic_add_int(&sifa->refcount, 1);
2939                 return (sifa);
2940
2941         }
2942
2943         /* plan_c: do we have an acceptable address on the emit interface */
2944         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2945         if (emit_ifn == NULL) {
2946                 goto plan_d;
2947         }
2948         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2949                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2950                     (non_asoc_addr_ok == 0))
2951                         continue;
2952                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2953                     dest_is_priv, fam);
2954                 if (sifa == NULL)
2955                         continue;
2956                 if (stcb) {
2957                         if (((non_asoc_addr_ok == 0) &&
2958                             (sctp_is_addr_restricted(stcb, sifa))) ||
2959                             (non_asoc_addr_ok &&
2960                             (sctp_is_addr_restricted(stcb, sifa)) &&
2961                             (!sctp_is_addr_pending(stcb, sifa)))) {
2962                                 /*
2963                                  * It is restricted for some reason..
2964                                  * probably not yet added.
2965                                  */
2966                                 continue;
2967                         }
2968                 }
2969                 atomic_add_int(&sifa->refcount, 1);
2970                 return (sifa);
2971         }
2972 plan_d:
2973         /*
2974          * plan_d: We are in trouble. No preferred address on the emit
2975          * interface. And not even a preferred address on all interfaces. Go
2976          * out and see if we can find an acceptable address somewhere
2977          * amongst all interfaces.
2978          */
2979         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
2980         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2981                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2982                         /* wrong base scope */
2983                         continue;
2984                 }
2985                 if ((sctp_ifn == looked_at) && looked_at)
2986                         /* already looked at this guy */
2987                         continue;
2988
2989                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2990                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2991                             (non_asoc_addr_ok == 0))
2992                                 continue;
2993                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
2994                             dest_is_loop,
2995                             dest_is_priv, fam);
2996                         if (sifa == NULL)
2997                                 continue;
2998                         if (stcb) {
2999                                 if (((non_asoc_addr_ok == 0) &&
3000                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3001                                     (non_asoc_addr_ok &&
3002                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3003                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3004                                         /*
3005                                          * It is restricted for some
3006                                          * reason.. probably not yet added.
3007                                          */
3008                                         continue;
3009                                 }
3010                         }
3011                         atomic_add_int(&sifa->refcount, 1);
3012                         return (sifa);
3013                 }
3014         }
3015         /*
3016          * Ok we can find NO address to source from that is not on our
3017          * restricted list and non_asoc_address is NOT ok, or it is on our
3018          * restricted list. We can't source to it :-(
3019          */
3020         return (NULL);
3021 }
3022
3023
3024
3025 /* tcb may be NULL */
3026 struct sctp_ifa *
3027 sctp_source_address_selection(struct sctp_inpcb *inp,
3028     struct sctp_tcb *stcb,
3029     sctp_route_t * ro,
3030     struct sctp_nets *net,
3031     int non_asoc_addr_ok, uint32_t vrf_id)
3032 {
3033         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3034
3035 #ifdef INET6
3036         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3037
3038 #endif
3039         struct sctp_ifa *answer;
3040         uint8_t dest_is_priv, dest_is_loop;
3041         sa_family_t fam;
3042
3043         /*-
3044          * Rules: - Find the route if needed, cache if I can. - Look at
3045          * interface address in route, Is it in the bound list. If so we
3046          * have the best source. - If not we must rotate amongst the
3047          * addresses.
3048          *
3049          * Cavets and issues
3050          *
3051          * Do we need to pay attention to scope. We can have a private address
3052          * or a global address we are sourcing or sending to. So if we draw
3053          * it out
3054          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3055          * For V4
3056          *------------------------------------------
3057          *      source     *      dest  *  result
3058          * -----------------------------------------
3059          * <a>  Private    *    Global  *  NAT
3060          * -----------------------------------------
3061          * <b>  Private    *    Private *  No problem
3062          * -----------------------------------------
3063          * <c>  Global     *    Private *  Huh, How will this work?
3064          * -----------------------------------------
3065          * <d>  Global     *    Global  *  No Problem
3066          *------------------------------------------
3067          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3068          * For V6
3069          *------------------------------------------
3070          *      source     *      dest  *  result
3071          * -----------------------------------------
3072          * <a>  Linklocal  *    Global  *
3073          * -----------------------------------------
3074          * <b>  Linklocal  * Linklocal  *  No problem
3075          * -----------------------------------------
3076          * <c>  Global     * Linklocal  *  Huh, How will this work?
3077          * -----------------------------------------
3078          * <d>  Global     *    Global  *  No Problem
3079          *------------------------------------------
3080          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3081          *
3082          * And then we add to that what happens if there are multiple addresses
3083          * assigned to an interface. Remember the ifa on a ifn is a linked
3084          * list of addresses. So one interface can have more than one IP
3085          * address. What happens if we have both a private and a global
3086          * address? Do we then use context of destination to sort out which
3087          * one is best? And what about NAT's sending P->G may get you a NAT
3088          * translation, or should you select the G thats on the interface in
3089          * preference.
3090          *
3091          * Decisions:
3092          *
3093          * - count the number of addresses on the interface.
3094          * - if it is one, no problem except case <c>.
3095          *   For <a> we will assume a NAT out there.
3096          * - if there are more than one, then we need to worry about scope P
3097          *   or G. We should prefer G -> G and P -> P if possible.
3098          *   Then as a secondary fall back to mixed types G->P being a last
3099          *   ditch one.
3100          * - The above all works for bound all, but bound specific we need to
3101          *   use the same concept but instead only consider the bound
3102          *   addresses. If the bound set is NOT assigned to the interface then
3103          *   we must use rotation amongst the bound addresses..
3104          */
3105         if (ro->ro_rt == NULL) {
3106                 /*
3107                  * Need a route to cache.
3108                  */
3109                 SCTP_RTALLOC(ro, vrf_id);
3110         }
3111         if (ro->ro_rt == NULL) {
3112                 return (NULL);
3113         }
3114         fam = to->sin_family;
3115         dest_is_priv = dest_is_loop = 0;
3116         /* Setup our scopes for the destination */
3117         switch (fam) {
3118         case AF_INET:
3119                 /* Scope based on outbound address */
3120                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3121                         dest_is_loop = 1;
3122                         if (net != NULL) {
3123                                 /* mark it as local */
3124                                 net->addr_is_local = 1;
3125                         }
3126                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3127                         dest_is_priv = 1;
3128                 }
3129                 break;
3130 #ifdef INET6
3131         case AF_INET6:
3132                 /* Scope based on outbound address */
3133                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3134                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3135                         /*
3136                          * If the address is a loopback address, which
3137                          * consists of "::1" OR "fe80::1%lo0", we are
3138                          * loopback scope. But we don't use dest_is_priv
3139                          * (link local addresses).
3140                          */
3141                         dest_is_loop = 1;
3142                         if (net != NULL) {
3143                                 /* mark it as local */
3144                                 net->addr_is_local = 1;
3145                         }
3146                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3147                         dest_is_priv = 1;
3148                 }
3149                 break;
3150 #endif
3151         }
3152         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3153         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3154         SCTP_IPI_ADDR_RLOCK();
3155         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3156                 /*
3157                  * Bound all case
3158                  */
3159                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3160                     dest_is_priv, dest_is_loop,
3161                     non_asoc_addr_ok, fam);
3162                 SCTP_IPI_ADDR_RUNLOCK();
3163                 return (answer);
3164         }
3165         /*
3166          * Subset bound case
3167          */
3168         if (stcb) {
3169                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3170                     vrf_id, dest_is_priv,
3171                     dest_is_loop,
3172                     non_asoc_addr_ok, fam);
3173         } else {
3174                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3175                     non_asoc_addr_ok,
3176                     dest_is_priv,
3177                     dest_is_loop, fam);
3178         }
3179         SCTP_IPI_ADDR_RUNLOCK();
3180         return (answer);
3181 }
3182
3183 static int
3184 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3185 {
3186         struct cmsghdr cmh;
3187         int tlen, at;
3188
3189         tlen = SCTP_BUF_LEN(control);
3190         at = 0;
3191         /*
3192          * Independent of how many mbufs, find the c_type inside the control
3193          * structure and copy out the data.
3194          */
3195         while (at < tlen) {
3196                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3197                         /* not enough room for one more we are done. */
3198                         return (0);
3199                 }
3200                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3201                 if (((int)cmh.cmsg_len + at) > tlen) {
3202                         /*
3203                          * this is real messed up since there is not enough
3204                          * data here to cover the cmsg header. We are done.
3205                          */
3206                         return (0);
3207                 }
3208                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3209                     (c_type == cmh.cmsg_type)) {
3210                         /* found the one we want, copy it out */
3211                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3212                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3213                                 /*
3214                                  * space of cmsg_len after header not big
3215                                  * enough
3216                                  */
3217                                 return (0);
3218                         }
3219                         m_copydata(control, at, cpsize, data);
3220                         return (1);
3221                 } else {
3222                         at += CMSG_ALIGN(cmh.cmsg_len);
3223                         if (cmh.cmsg_len == 0) {
3224                                 break;
3225                         }
3226                 }
3227         }
3228         /* not found */
3229         return (0);
3230 }
3231
3232 static struct mbuf *
3233 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3234     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3235 {
3236         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3237         struct sctp_state_cookie *stc;
3238         struct sctp_paramhdr *ph;
3239         uint8_t *foo;
3240         int sig_offset;
3241         uint16_t cookie_sz;
3242
3243         mret = NULL;
3244         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3245             sizeof(struct sctp_paramhdr)), 0,
3246             M_DONTWAIT, 1, MT_DATA);
3247         if (mret == NULL) {
3248                 return (NULL);
3249         }
3250         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3251         if (copy_init == NULL) {
3252                 sctp_m_freem(mret);
3253                 return (NULL);
3254         }
3255 #ifdef SCTP_MBUF_LOGGING
3256         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3257                 struct mbuf *mat;
3258
3259                 mat = copy_init;
3260                 while (mat) {
3261                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3262                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3263                         }
3264                         mat = SCTP_BUF_NEXT(mat);
3265                 }
3266         }
3267 #endif
3268         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3269             M_DONTWAIT);
3270         if (copy_initack == NULL) {
3271                 sctp_m_freem(mret);
3272                 sctp_m_freem(copy_init);
3273                 return (NULL);
3274         }
3275 #ifdef SCTP_MBUF_LOGGING
3276         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3277                 struct mbuf *mat;
3278
3279                 mat = copy_initack;
3280                 while (mat) {
3281                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3282                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3283                         }
3284                         mat = SCTP_BUF_NEXT(mat);
3285                 }
3286         }
3287 #endif
3288         /* easy side we just drop it on the end */
3289         ph = mtod(mret, struct sctp_paramhdr *);
3290         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3291             sizeof(struct sctp_paramhdr);
3292         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3293             sizeof(struct sctp_paramhdr));
3294         ph->param_type = htons(SCTP_STATE_COOKIE);
3295         ph->param_length = 0;   /* fill in at the end */
3296         /* Fill in the stc cookie data */
3297         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3298
3299         /* tack the INIT and then the INIT-ACK onto the chain */
3300         cookie_sz = 0;
3301         m_at = mret;
3302         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3303                 cookie_sz += SCTP_BUF_LEN(m_at);
3304                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3305                         SCTP_BUF_NEXT(m_at) = copy_init;
3306                         break;
3307                 }
3308         }
3309
3310         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3311                 cookie_sz += SCTP_BUF_LEN(m_at);
3312                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3313                         SCTP_BUF_NEXT(m_at) = copy_initack;
3314                         break;
3315                 }
3316         }
3317
3318         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3319                 cookie_sz += SCTP_BUF_LEN(m_at);
3320                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3321                         break;
3322                 }
3323         }
3324         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3325         if (sig == NULL) {
3326                 /* no space, so free the entire chain */
3327                 sctp_m_freem(mret);
3328                 return (NULL);
3329         }
3330         SCTP_BUF_LEN(sig) = 0;
3331         SCTP_BUF_NEXT(m_at) = sig;
3332         sig_offset = 0;
3333         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3334         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3335         *signature = foo;
3336         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3337         cookie_sz += SCTP_SIGNATURE_SIZE;
3338         ph->param_length = htons(cookie_sz);
3339         return (mret);
3340 }
3341
3342
3343 static uint8_t
3344 sctp_get_ect(struct sctp_tcb *stcb,
3345     struct sctp_tmit_chunk *chk)
3346 {
3347         uint8_t this_random;
3348
3349         /* Huh? */
3350         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3351                 return (0);
3352
3353         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
3354                 /* no nonce, always return ECT0 */
3355                 return (SCTP_ECT0_BIT);
3356
3357         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3358                 /* Peer does NOT support it, so we send a ECT0 only */
3359                 return (SCTP_ECT0_BIT);
3360         }
3361         if (chk == NULL)
3362                 return (SCTP_ECT0_BIT);
3363
3364         if ((stcb->asoc.hb_random_idx > 3) ||
3365             ((stcb->asoc.hb_random_idx == 3) &&
3366             (stcb->asoc.hb_ect_randombit > 7))) {
3367                 uint32_t rndval;
3368
3369 warp_drive_sa:
3370                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3371                 memcpy(stcb->asoc.hb_random_values, &rndval,
3372                     sizeof(stcb->asoc.hb_random_values));
3373                 this_random = stcb->asoc.hb_random_values[0];
3374                 stcb->asoc.hb_random_idx = 0;
3375                 stcb->asoc.hb_ect_randombit = 0;
3376         } else {
3377                 if (stcb->asoc.hb_ect_randombit > 7) {
3378                         stcb->asoc.hb_ect_randombit = 0;
3379                         stcb->asoc.hb_random_idx++;
3380                         if (stcb->asoc.hb_random_idx > 3) {
3381                                 goto warp_drive_sa;
3382                         }
3383                 }
3384                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3385         }
3386         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3387                 if (chk != NULL)
3388                         /* ECN Nonce stuff */
3389                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3390                 stcb->asoc.hb_ect_randombit++;
3391                 return (SCTP_ECT1_BIT);
3392         } else {
3393                 stcb->asoc.hb_ect_randombit++;
3394                 return (SCTP_ECT0_BIT);
3395         }
3396 }
3397
3398 static int
3399 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3400     struct sctp_tcb *stcb,      /* may be NULL */
3401     struct sctp_nets *net,
3402     struct sockaddr *to,
3403     struct mbuf *m,
3404     uint32_t auth_offset,
3405     struct sctp_auth_chunk *auth,
3406     uint16_t auth_keyid,
3407     int nofragment_flag,
3408     int ecn_ok,
3409     struct sctp_tmit_chunk *chk,
3410     int out_of_asoc_ok,
3411     uint16_t src_port,
3412     uint16_t dest_port,
3413     uint32_t v_tag,
3414     uint16_t port,
3415     int so_locked,
3416 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3417     SCTP_UNUSED
3418 #endif
3419     union sctp_sockstore *over_addr
3420 )
3421 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3422 {
3423         /*
3424          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3425          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3426          * structure: - fill in the HMAC digest of any AUTH chunk in the
3427          * packet. - calculate and fill in the SCTP checksum. - prepend an
3428          * IP address header. - if boundall use INADDR_ANY. - if
3429          * boundspecific do source address selection. - set fragmentation
3430          * option for ipV4. - On return from IP output, check/adjust mtu
3431          * size of output interface and smallest_mtu size as well.
3432          */
3433         /* Will need ifdefs around this */
3434         struct mbuf *o_pak;
3435         struct mbuf *newm;
3436         struct sctphdr *sctphdr;
3437         int packet_length;
3438         int ret;
3439         uint32_t vrf_id;
3440         sctp_route_t *ro = NULL;
3441         struct udphdr *udp = NULL;
3442
3443 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3444         struct socket *so = NULL;
3445
3446 #endif
3447
3448         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3449                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3450                 sctp_m_freem(m);
3451                 return (EFAULT);
3452         }
3453         if (stcb) {
3454                 vrf_id = stcb->asoc.vrf_id;
3455         } else {
3456                 vrf_id = inp->def_vrf_id;
3457         }
3458
3459         /* fill in the HMAC digest for any AUTH chunk in the packet */
3460         if ((auth != NULL) && (stcb != NULL)) {
3461                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3462         }
3463         if (to->sa_family == AF_INET) {
3464                 struct ip *ip = NULL;
3465                 sctp_route_t iproute;
3466                 uint8_t tos_value;
3467                 int len;
3468
3469                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3470                 if (port) {
3471                         len += sizeof(struct udphdr);
3472                 }
3473                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3474                 if (newm == NULL) {
3475                         sctp_m_freem(m);
3476                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3477                         return (ENOMEM);
3478                 }
3479                 SCTP_ALIGN_TO_END(newm, len);
3480                 SCTP_BUF_LEN(newm) = len;
3481                 SCTP_BUF_NEXT(newm) = m;
3482                 m = newm;
3483                 packet_length = sctp_calculate_len(m);
3484                 ip = mtod(m, struct ip *);
3485                 ip->ip_v = IPVERSION;
3486                 ip->ip_hl = (sizeof(struct ip) >> 2);
3487                 if (net) {
3488                         tos_value = net->tos_flowlabel & 0x000000ff;
3489                 } else {
3490                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3491                 }
3492                 if ((nofragment_flag) && (port == 0)) {
3493 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__)
3494                         ip->ip_off = IP_DF;
3495 #else
3496                         ip->ip_off = htons(IP_DF);
3497 #endif
3498                 } else
3499                         ip->ip_off = 0;
3500
3501                 /* FreeBSD has a function for ip_id's */
3502                 ip->ip_id = ip_newid();
3503
3504                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3505                 ip->ip_len = packet_length;
3506                 if (stcb) {
3507                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3508                                 /* Enable ECN */
3509                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3510                         } else {
3511                                 /* No ECN */
3512                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3513                         }
3514                 } else {
3515                         /* no association at all */
3516                         ip->ip_tos = (tos_value & 0xfc);
3517                 }
3518                 if (port) {
3519                         ip->ip_p = IPPROTO_UDP;
3520                 } else {
3521                         ip->ip_p = IPPROTO_SCTP;
3522                 }
3523                 ip->ip_sum = 0;
3524                 if (net == NULL) {
3525                         ro = &iproute;
3526                         memset(&iproute, 0, sizeof(iproute));
3527                         memcpy(&ro->ro_dst, to, to->sa_len);
3528                 } else {
3529                         ro = (sctp_route_t *) & net->ro;
3530                 }
3531                 /* Now the address selection part */
3532                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3533
3534                 /* call the routine to select the src address */
3535                 if (net && out_of_asoc_ok == 0) {
3536                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3537                                 sctp_free_ifa(net->ro._s_addr);
3538                                 net->ro._s_addr = NULL;
3539                                 net->src_addr_selected = 0;
3540                                 if (ro->ro_rt) {
3541                                         RTFREE(ro->ro_rt);
3542                                         ro->ro_rt = NULL;
3543                                 }
3544                         }
3545                         if (net->src_addr_selected == 0) {
3546                                 /* Cache the source address */
3547                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3548                                     ro, net, 0,
3549                                     vrf_id);
3550                                 net->src_addr_selected = 1;
3551                         }
3552                         if (net->ro._s_addr == NULL) {
3553                                 /* No route to host */
3554                                 net->src_addr_selected = 0;
3555                                 goto no_route;
3556                         }
3557                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3558                 } else {
3559                         if (over_addr == NULL) {
3560                                 struct sctp_ifa *_lsrc;
3561
3562                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3563                                     net,
3564                                     out_of_asoc_ok,
3565                                     vrf_id);
3566                                 if (_lsrc == NULL) {
3567                                         goto no_route;
3568                                 }
3569                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3570                                 sctp_free_ifa(_lsrc);
3571                         } else {
3572                                 ip->ip_src = over_addr->sin.sin_addr;
3573                                 SCTP_RTALLOC(ro, vrf_id);
3574                         }
3575                 }
3576                 if (port) {
3577                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3578                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3579                         udp->uh_dport = port;
3580                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3581                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3582                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3583                 } else {
3584                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3585                 }
3586
3587                 sctphdr->src_port = src_port;
3588                 sctphdr->dest_port = dest_port;
3589                 sctphdr->v_tag = v_tag;
3590                 sctphdr->checksum = 0;
3591
3592                 /*
3593                  * If source address selection fails and we find no route
3594                  * then the ip_output should fail as well with a
3595                  * NO_ROUTE_TO_HOST type error. We probably should catch
3596                  * that somewhere and abort the association right away
3597                  * (assuming this is an INIT being sent).
3598                  */
3599                 if ((ro->ro_rt == NULL)) {
3600                         /*
3601                          * src addr selection failed to find a route (or
3602                          * valid source addr), so we can't get there from
3603                          * here (yet)!
3604                          */
3605         no_route:
3606                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3607                             "%s: dropped packet - no valid source addr\n",
3608                             __FUNCTION__);
3609                         if (net) {
3610                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3611                                     "Destination was ");
3612                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3613                                     &net->ro._l_addr.sa);
3614                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3615                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3616                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3617                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3618                                                     stcb,
3619                                                     SCTP_FAILED_THRESHOLD,
3620                                                     (void *)net,
3621                                                     so_locked);
3622                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3623                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3624                                                 /*
3625                                                  * JRS 5/14/07 - If a
3626                                                  * destination is
3627                                                  * unreachable, the PF bit
3628                                                  * is turned off.  This
3629                                                  * allows an unambiguous use
3630                                                  * of the PF bit for
3631                                                  * destinations that are
3632                                                  * reachable but potentially
3633                                                  * failed. If the
3634                                                  * destination is set to the
3635                                                  * unreachable state, also
3636                                                  * set the destination to
3637                                                  * the PF state.
3638                                                  */
3639                                                 /*
3640                                                  * Add debug message here if
3641                                                  * destination is not in PF
3642                                                  * state.
3643                                                  */
3644                                                 /*
3645                                                  * Stop any running T3
3646                                                  * timers here?
3647                                                  */
3648                                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
3649                                                         net->dest_state &= ~SCTP_ADDR_PF;
3650                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3651                                                             net);
3652                                                 }
3653                                         }
3654                                 }
3655                                 if (stcb) {
3656                                         if (net == stcb->asoc.primary_destination) {
3657                                                 /* need a new primary */
3658                                                 struct sctp_nets *alt;
3659
3660                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3661                                                 if (alt != net) {
3662                                                         if (sctp_set_primary_addr(stcb,
3663                                                             (struct sockaddr *)NULL,
3664                                                             alt) == 0) {
3665                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3666                                                                 if (net->ro._s_addr) {
3667                                                                         sctp_free_ifa(net->ro._s_addr);
3668                                                                         net->ro._s_addr = NULL;
3669                                                                 }
3670                                                                 net->src_addr_selected = 0;
3671                                                         }
3672                                                 }
3673                                         }
3674                                 }
3675                         }
3676                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3677                         sctp_m_freem(m);
3678                         return (EHOSTUNREACH);
3679                 }
3680                 if (ro != &iproute) {
3681                         memcpy(&iproute, ro, sizeof(*ro));
3682                 }
3683                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3684                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3685                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3686                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3687                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3688                     ro->ro_rt);
3689
3690                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3691                         /* failed to prepend data, give up */
3692                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3693                         sctp_m_freem(m);
3694                         return (ENOMEM);
3695                 }
3696 #ifdef  SCTP_PACKET_LOGGING
3697                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3698                         sctp_packet_log(m, packet_length);
3699 #endif
3700                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3701                 if (port) {
3702                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3703                             (stcb) &&
3704                             (stcb->asoc.loopback_scope))) {
3705                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3706                                 SCTP_STAT_INCR(sctps_sendswcrc);
3707                         } else {
3708                                 SCTP_STAT_INCR(sctps_sendnocrc);
3709                         }
3710                         SCTP_ENABLE_UDP_CSUM(o_pak);
3711                 } else {
3712                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3713                             (stcb) &&
3714                             (stcb->asoc.loopback_scope))) {
3715                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
3716                                 m->m_pkthdr.csum_data = 0;      /* FIXME MT */
3717                                 SCTP_STAT_INCR(sctps_sendhwcrc);
3718                         } else {
3719                                 SCTP_STAT_INCR(sctps_sendnocrc);
3720                         }
3721                 }
3722                 /* send it out.  table id is taken from stcb */
3723 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3724                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3725                         so = SCTP_INP_SO(inp);
3726                         SCTP_SOCKET_UNLOCK(so, 0);
3727                 }
3728 #endif
3729                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3730 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3731                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3732                         atomic_add_int(&stcb->asoc.refcnt, 1);
3733                         SCTP_TCB_UNLOCK(stcb);
3734                         SCTP_SOCKET_LOCK(so, 0);
3735                         SCTP_TCB_LOCK(stcb);
3736                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3737                 }
3738 #endif
3739                 SCTP_STAT_INCR(sctps_sendpackets);
3740                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3741                 if (ret)
3742                         SCTP_STAT_INCR(sctps_senderrors);
3743
3744                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3745                 if (net == NULL) {
3746                         /* free tempy routes */
3747                         if (ro->ro_rt) {
3748                                 RTFREE(ro->ro_rt);
3749                                 ro->ro_rt = NULL;
3750                         }
3751                 } else {
3752                         /* PMTU check versus smallest asoc MTU goes here */
3753                         if ((ro->ro_rt != NULL) &&
3754                             (net->ro._s_addr)) {
3755                                 uint32_t mtu;
3756
3757                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3758                                 if (net->port) {
3759                                         mtu -= sizeof(struct udphdr);
3760                                 }
3761                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3762 #ifdef SCTP_PRINT_FOR_B_AND_M
3763                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n", mtu);
3764 #endif
3765                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3766                                         net->mtu = mtu;
3767                                 }
3768                         } else if (ro->ro_rt == NULL) {
3769                                 /* route was freed */
3770                                 if (net->ro._s_addr &&
3771                                     net->src_addr_selected) {
3772                                         sctp_free_ifa(net->ro._s_addr);
3773                                         net->ro._s_addr = NULL;
3774                                 }
3775                                 net->src_addr_selected = 0;
3776                         }
3777                 }
3778                 return (ret);
3779         }
3780 #ifdef INET6
3781         else if (to->sa_family == AF_INET6) {
3782                 uint32_t flowlabel;
3783                 struct ip6_hdr *ip6h;
3784                 struct route_in6 ip6route;
3785                 struct ifnet *ifp;
3786                 u_char flowTop;
3787                 uint16_t flowBottom;
3788                 u_char tosBottom, tosTop;
3789                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3790                 int prev_scope = 0;
3791                 struct sockaddr_in6 lsa6_storage;
3792                 int error;
3793                 u_short prev_port = 0;
3794                 int len;
3795
3796                 if (net != NULL) {
3797                         flowlabel = net->tos_flowlabel;
3798                 } else {
3799                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3800                 }
3801
3802                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3803                 if (port) {
3804                         len += sizeof(struct udphdr);
3805                 }
3806                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3807                 if (newm == NULL) {
3808                         sctp_m_freem(m);
3809                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3810                         return (ENOMEM);
3811                 }
3812                 SCTP_ALIGN_TO_END(newm, len);
3813                 SCTP_BUF_LEN(newm) = len;
3814                 SCTP_BUF_NEXT(newm) = m;
3815                 m = newm;
3816                 packet_length = sctp_calculate_len(m);
3817
3818                 ip6h = mtod(m, struct ip6_hdr *);
3819                 /*
3820                  * We assume here that inp_flow is in host byte order within
3821                  * the TCB!
3822                  */
3823                 flowBottom = flowlabel & 0x0000ffff;
3824                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3825                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3826                 /* protect *sin6 from overwrite */
3827                 sin6 = (struct sockaddr_in6 *)to;
3828                 tmp = *sin6;
3829                 sin6 = &tmp;
3830
3831                 /* KAME hack: embed scopeid */
3832                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3833                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3834                         return (EINVAL);
3835                 }
3836                 if (net == NULL) {
3837                         memset(&ip6route, 0, sizeof(ip6route));
3838                         ro = (sctp_route_t *) & ip6route;
3839                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3840                 } else {
3841                         ro = (sctp_route_t *) & net->ro;
3842                 }
3843                 if (stcb != NULL) {
3844                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3845                                 /* Enable ECN */
3846                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3847                         } else {
3848                                 /* No ECN */
3849                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3850                         }
3851                 } else {
3852                         /* we could get no asoc if it is a O-O-T-B packet */
3853                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3854                 }
3855                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3856                 if (port) {
3857                         ip6h->ip6_nxt = IPPROTO_UDP;
3858                 } else {
3859                         ip6h->ip6_nxt = IPPROTO_SCTP;
3860                 }
3861                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3862                 ip6h->ip6_dst = sin6->sin6_addr;
3863
3864                 /*
3865                  * Add SRC address selection here: we can only reuse to a
3866                  * limited degree the kame src-addr-sel, since we can try
3867                  * their selection but it may not be bound.
3868                  */
3869                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3870                 lsa6_tmp.sin6_family = AF_INET6;
3871                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3872                 lsa6 = &lsa6_tmp;
3873                 if (net && out_of_asoc_ok == 0) {
3874                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3875                                 sctp_free_ifa(net->ro._s_addr);
3876                                 net->ro._s_addr = NULL;
3877                                 net->src_addr_selected = 0;
3878                                 if (ro->ro_rt) {
3879                                         RTFREE(ro->ro_rt);
3880                                         ro->ro_rt = NULL;
3881                                 }
3882                         }
3883                         if (net->src_addr_selected == 0) {
3884                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3885                                 /* KAME hack: embed scopeid */
3886                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3887                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3888                                         return (EINVAL);
3889                                 }
3890                                 /* Cache the source address */
3891                                 net->ro._s_addr = sctp_source_address_selection(inp,
3892                                     stcb,
3893                                     ro,
3894                                     net,
3895                                     0,
3896                                     vrf_id);
3897                                 (void)sa6_recoverscope(sin6);
3898                                 net->src_addr_selected = 1;
3899                         }
3900                         if (net->ro._s_addr == NULL) {
3901                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3902                                 net->src_addr_selected = 0;
3903                                 goto no_route;
3904                         }
3905                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3906                 } else {
3907                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3908                         /* KAME hack: embed scopeid */
3909                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3910                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3911                                 return (EINVAL);
3912                         }
3913                         if (over_addr == NULL) {
3914                                 struct sctp_ifa *_lsrc;
3915
3916                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3917                                     net,
3918                                     out_of_asoc_ok,
3919                                     vrf_id);
3920                                 if (_lsrc == NULL) {
3921                                         goto no_route;
3922                                 }
3923                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3924                                 sctp_free_ifa(_lsrc);
3925                         } else {
3926                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3927                                 SCTP_RTALLOC(ro, vrf_id);
3928                         }
3929                         (void)sa6_recoverscope(sin6);
3930                 }
3931                 lsa6->sin6_port = inp->sctp_lport;
3932
3933                 if (ro->ro_rt == NULL) {
3934                         /*
3935                          * src addr selection failed to find a route (or
3936                          * valid source addr), so we can't get there from
3937                          * here!
3938                          */
3939                         goto no_route;
3940                 }
3941                 /*
3942                  * XXX: sa6 may not have a valid sin6_scope_id in the
3943                  * non-SCOPEDROUTING case.
3944                  */
3945                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3946                 lsa6_storage.sin6_family = AF_INET6;
3947                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3948                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3949                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3950                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3951                         sctp_m_freem(m);
3952                         return (error);
3953                 }
3954                 /* XXX */
3955                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3956                 lsa6_storage.sin6_port = inp->sctp_lport;
3957                 lsa6 = &lsa6_storage;
3958                 ip6h->ip6_src = lsa6->sin6_addr;
3959
3960                 if (port) {
3961                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3962                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3963                         udp->uh_dport = port;
3964                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3965                         udp->uh_sum = 0;
3966                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3967                 } else {
3968                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3969                 }
3970
3971                 sctphdr->src_port = src_port;
3972                 sctphdr->dest_port = dest_port;
3973                 sctphdr->v_tag = v_tag;
3974                 sctphdr->checksum = 0;
3975
3976                 /*
3977                  * We set the hop limit now since there is a good chance
3978                  * that our ro pointer is now filled
3979                  */
3980                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3981                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3982
3983 #ifdef SCTP_DEBUG
3984                 /* Copy to be sure something bad is not happening */
3985                 sin6->sin6_addr = ip6h->ip6_dst;
3986                 lsa6->sin6_addr = ip6h->ip6_src;
3987 #endif
3988
3989                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3990                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3991                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3992                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3993                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3994                 if (net) {
3995                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3996                         /* preserve the port and scope for link local send */
3997                         prev_scope = sin6->sin6_scope_id;
3998                         prev_port = sin6->sin6_port;
3999                 }
4000                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4001                         /* failed to prepend data, give up */
4002                         sctp_m_freem(m);
4003                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4004                         return (ENOMEM);
4005                 }
4006 #ifdef  SCTP_PACKET_LOGGING
4007                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4008                         sctp_packet_log(m, packet_length);
4009 #endif
4010                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4011                 if (port) {
4012                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4013                             (stcb) &&
4014                             (stcb->asoc.loopback_scope))) {
4015                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4016                                 SCTP_STAT_INCR(sctps_sendswcrc);
4017                         } else {
4018                                 SCTP_STAT_INCR(sctps_sendnocrc);
4019                         }
4020                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4021                                 udp->uh_sum = 0xffff;
4022                         }
4023                 } else {
4024                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4025                             (stcb) &&
4026                             (stcb->asoc.loopback_scope))) {
4027                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4028                                 m->m_pkthdr.csum_data = 0;      /* FIXME MT */
4029                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4030                         } else {
4031                                 SCTP_STAT_INCR(sctps_sendnocrc);
4032                         }
4033                 }
4034                 /* send it out. table id is taken from stcb */
4035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4036                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4037                         so = SCTP_INP_SO(inp);
4038                         SCTP_SOCKET_UNLOCK(so, 0);
4039                 }
4040 #endif
4041                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4042 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4043                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4044                         atomic_add_int(&stcb->asoc.refcnt, 1);
4045                         SCTP_TCB_UNLOCK(stcb);
4046                         SCTP_SOCKET_LOCK(so, 0);
4047                         SCTP_TCB_LOCK(stcb);
4048                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4049                 }
4050 #endif
4051                 if (net) {
4052                         /* for link local this must be done */
4053                         sin6->sin6_scope_id = prev_scope;
4054                         sin6->sin6_port = prev_port;
4055                 }
4056                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4057                 SCTP_STAT_INCR(sctps_sendpackets);
4058                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4059                 if (ret) {
4060                         SCTP_STAT_INCR(sctps_senderrors);
4061                 }
4062                 if (net == NULL) {
4063                         /* Now if we had a temp route free it */
4064                         if (ro->ro_rt) {
4065                                 RTFREE(ro->ro_rt);
4066                         }
4067                 } else {
4068                         /* PMTU check versus smallest asoc MTU goes here */
4069                         if (ro->ro_rt == NULL) {
4070                                 /* Route was freed */
4071                                 if (net->ro._s_addr &&
4072                                     net->src_addr_selected) {
4073                                         sctp_free_ifa(net->ro._s_addr);
4074                                         net->ro._s_addr = NULL;
4075                                 }
4076                                 net->src_addr_selected = 0;
4077                         }
4078                         if ((ro->ro_rt != NULL) &&
4079                             (net->ro._s_addr)) {
4080                                 uint32_t mtu;
4081
4082                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4083                                 if (mtu &&
4084                                     (stcb->asoc.smallest_mtu > mtu)) {
4085 #ifdef SCTP_PRINT_FOR_B_AND_M
4086                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
4087                                             mtu);
4088 #endif
4089                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4090                                         net->mtu = mtu;
4091                                         if (net->port) {
4092                                                 net->mtu -= sizeof(struct udphdr);
4093                                         }
4094                                 }
4095                         } else if (ifp) {
4096                                 if (ND_IFINFO(ifp)->linkmtu &&
4097                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4098 #ifdef SCTP_PRINT_FOR_B_AND_M
4099                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
4100                                             ND_IFINFO(ifp)->linkmtu);
4101 #endif
4102                                         sctp_mtu_size_reset(inp,
4103                                             &stcb->asoc,
4104                                             ND_IFINFO(ifp)->linkmtu);
4105                                 }
4106                         }
4107                 }
4108                 return (ret);
4109         }
4110 #endif
4111         else {
4112                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4113                     ((struct sockaddr *)to)->sa_family);
4114                 sctp_m_freem(m);
4115                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4116                 return (EFAULT);
4117         }
4118 }
4119
4120
4121 void
4122 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4123 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4124     SCTP_UNUSED
4125 #endif
4126 )
4127 {
4128         struct mbuf *m, *m_at, *mp_last;
4129         struct sctp_nets *net;
4130         struct sctp_init_chunk *init;
4131         struct sctp_supported_addr_param *sup_addr;
4132         struct sctp_adaptation_layer_indication *ali;
4133         struct sctp_ecn_supported_param *ecn;
4134         struct sctp_prsctp_supported_param *prsctp;
4135         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4136         struct sctp_supported_chunk_types_param *pr_supported;
4137         int cnt_inits_to = 0;
4138         int padval, ret;
4139         int num_ext;
4140         int p_len;
4141
4142         /* INIT's always go to the primary (and usually ONLY address) */
4143         mp_last = NULL;
4144         net = stcb->asoc.primary_destination;
4145         if (net == NULL) {
4146                 net = TAILQ_FIRST(&stcb->asoc.nets);
4147                 if (net == NULL) {
4148                         /* TSNH */
4149                         return;
4150                 }
4151                 /* we confirm any address we send an INIT to */
4152                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4153                 (void)sctp_set_primary_addr(stcb, NULL, net);
4154         } else {
4155                 /* we confirm any address we send an INIT to */
4156                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4157         }
4158         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4159 #ifdef INET6
4160         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4161                 /*
4162                  * special hook, if we are sending to link local it will not
4163                  * show up in our private address count.
4164                  */
4165                 struct sockaddr_in6 *sin6l;
4166
4167                 sin6l = &net->ro._l_addr.sin6;
4168                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4169                         cnt_inits_to = 1;
4170         }
4171 #endif
4172         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4173                 /* This case should not happen */
4174                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4175                 return;
4176         }
4177         /* start the INIT timer */
4178         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4179
4180         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4181         if (m == NULL) {
4182                 /* No memory, INIT timer will re-attempt. */
4183                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4184                 return;
4185         }
4186         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4187         /*
4188          * assume peer supports asconf in order to be able to queue local
4189          * address changes while an INIT is in flight and before the assoc
4190          * is established.
4191          */
4192         stcb->asoc.peer_supports_asconf = 1;
4193         /* Now lets put the SCTP header in place */
4194         init = mtod(m, struct sctp_init_chunk *);
4195         /* now the chunk header */
4196         init->ch.chunk_type = SCTP_INITIATION;
4197         init->ch.chunk_flags = 0;
4198         /* fill in later from mbuf we build */
4199         init->ch.chunk_length = 0;
4200         /* place in my tag */
4201         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4202         /* set up some of the credits. */
4203         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4204             SCTP_MINIMAL_RWND));
4205
4206         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4207         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4208         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4209         /* now the address restriction */
4210         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4211             sizeof(*init));
4212         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4213 #ifdef INET6
4214         /* we support 2 types: IPv6/IPv4 */
4215         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4216         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4217         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4218 #else
4219         /* we support 1 type: IPv4 */
4220         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4221         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4222         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4223 #endif
4224         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4225         /* adaptation layer indication parameter */
4226         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4227         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4228         ali->ph.param_length = htons(sizeof(*ali));
4229         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4230         SCTP_BUF_LEN(m) += sizeof(*ali);
4231         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4232
4233         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4234                 /* Add NAT friendly parameter */
4235                 struct sctp_paramhdr *ph;
4236
4237                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4238                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4239                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4240                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4241                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4242         }
4243         /* now any cookie time extensions */
4244         if (stcb->asoc.cookie_preserve_req) {
4245                 struct sctp_cookie_perserve_param *cookie_preserve;
4246
4247                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4248                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4249                 cookie_preserve->ph.param_length = htons(
4250                     sizeof(*cookie_preserve));
4251                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4252                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4253                 ecn = (struct sctp_ecn_supported_param *)(
4254                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4255                 stcb->asoc.cookie_preserve_req = 0;
4256         }
4257         /* ECN parameter */
4258         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4259                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4260                 ecn->ph.param_length = htons(sizeof(*ecn));
4261                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4262                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4263                     sizeof(*ecn));
4264         } else {
4265                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4266         }
4267         /* And now tell the peer we do pr-sctp */
4268         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4269         prsctp->ph.param_length = htons(sizeof(*prsctp));
4270         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4271
4272         /* And now tell the peer we do all the extensions */
4273         pr_supported = (struct sctp_supported_chunk_types_param *)
4274             ((caddr_t)prsctp + sizeof(*prsctp));
4275         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4276         num_ext = 0;
4277         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4278         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4279         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4280         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4281         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4282         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4283                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4284         }
4285         /*
4286          * EY  if the initiator supports nr_sacks, need to report that to
4287          * responder in INIT chunk
4288          */
4289         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off)) {
4290                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4291         }
4292         p_len = sizeof(*pr_supported) + num_ext;
4293         pr_supported->ph.param_length = htons(p_len);
4294         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4295         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4296
4297
4298         /* ECN nonce: And now tell the peer we support ECN nonce */
4299         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4300                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4301                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4302                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4303                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4304                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4305         }
4306         /* add authentication parameters */
4307         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4308                 struct sctp_auth_random *randp;
4309                 struct sctp_auth_hmac_algo *hmacs;
4310                 struct sctp_auth_chunk_list *chunks;
4311
4312                 /* attach RANDOM parameter, if available */
4313                 if (stcb->asoc.authinfo.random != NULL) {
4314                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4315                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4316                         /* random key already contains the header */
4317                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4318                         /* zero out any padding required */
4319                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4320                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4321                 }
4322                 /* add HMAC_ALGO parameter */
4323                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4324                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4325                     (uint8_t *) hmacs->hmac_ids);
4326                 if (p_len > 0) {
4327                         p_len += sizeof(*hmacs);
4328                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4329                         hmacs->ph.param_length = htons(p_len);
4330                         /* zero out any padding required */
4331                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4332                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4333                 }
4334                 /* add CHUNKS parameter */
4335                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4336                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4337                     chunks->chunk_types);
4338                 if (p_len > 0) {
4339                         p_len += sizeof(*chunks);
4340                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4341                         chunks->ph.param_length = htons(p_len);
4342                         /* zero out any padding required */
4343                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4344                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4345                 }
4346         }
4347         m_at = m;
4348         /* now the addresses */
4349         {
4350                 struct sctp_scoping scp;
4351
4352                 /*
4353                  * To optimize this we could put the scoping stuff into a
4354                  * structure and remove the individual uint8's from the
4355                  * assoc structure. Then we could just sifa in the address
4356                  * within the stcb.. but for now this is a quick hack to get
4357                  * the address stuff teased apart.
4358                  */
4359                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4360                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4361                 scp.loopback_scope = stcb->asoc.loopback_scope;
4362                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4363                 scp.local_scope = stcb->asoc.local_scope;
4364                 scp.site_scope = stcb->asoc.site_scope;
4365
4366                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4367         }
4368
4369         /* calulate the size and update pkt header and chunk header */
4370         p_len = 0;
4371         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4372                 if (SCTP_BUF_NEXT(m_at) == NULL)
4373                         mp_last = m_at;
4374                 p_len += SCTP_BUF_LEN(m_at);
4375         }
4376         init->ch.chunk_length = htons(p_len);
4377         /*
4378          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4379          * here since the timer will drive a retranmission.
4380          */
4381
4382         /* I don't expect this to execute but we will be safe here */
4383         padval = p_len % 4;
4384         if ((padval) && (mp_last)) {
4385                 /*
4386                  * The compiler worries that mp_last may not be set even
4387                  * though I think it is impossible :-> however we add
4388                  * mp_last here just in case.
4389                  */
4390                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4391                 if (ret) {
4392                         /* Houston we have a problem, no space */
4393                         sctp_m_freem(m);
4394                         return;
4395                 }
4396                 p_len += padval;
4397         }
4398         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4399         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4400             (struct sockaddr *)&net->ro._l_addr,
4401             m, 0, NULL, 0, 0, 0, NULL, 0,
4402             inp->sctp_lport, stcb->rport, htonl(0),
4403             net->port, so_locked, NULL);
4404         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4405         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4406         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4407 }
4408
4409 struct mbuf *
4410 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4411     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4412 {
4413         /*
4414          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4415          * being equal to the beginning of the params i.e. (iphlen +
4416          * sizeof(struct sctp_init_msg) parse through the parameters to the
4417          * end of the mbuf verifying that all parameters are known.
4418          *
4419          * For unknown parameters build and return a mbuf with
4420          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4421          * processing this chunk stop, and set *abort_processing to 1.
4422          *
4423          * By having param_offset be pre-set to where parameters begin it is
4424          * hoped that this routine may be reused in the future by new
4425          * features.
4426          */
4427         struct sctp_paramhdr *phdr, params;
4428
4429         struct mbuf *mat, *op_err;
4430         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4431         int at, limit, pad_needed;
4432         uint16_t ptype, plen, padded_size;
4433         int err_at;
4434
4435         *abort_processing = 0;
4436         mat = in_initpkt;
4437         err_at = 0;
4438         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4439         at = param_offset;
4440         op_err = NULL;
4441         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4442         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4443         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4444                 ptype = ntohs(phdr->param_type);
4445                 plen = ntohs(phdr->param_length);
4446                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4447                         /* wacked parameter */
4448                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4449                         goto invalid_size;
4450                 }
4451                 limit -= SCTP_SIZE32(plen);
4452                 /*-
4453                  * All parameters for all chunks that we know/understand are
4454                  * listed here. We process them other places and make
4455                  * appropriate stop actions per the upper bits. However this
4456                  * is the generic routine processor's can call to get back
4457                  * an operr.. to either incorporate (init-ack) or send.
4458                  */
4459                 padded_size = SCTP_SIZE32(plen);
4460                 switch (ptype) {
4461                         /* Param's with variable size */
4462                 case SCTP_HEARTBEAT_INFO:
4463                 case SCTP_STATE_COOKIE:
4464                 case SCTP_UNRECOG_PARAM:
4465                 case SCTP_ERROR_CAUSE_IND:
4466                         /* ok skip fwd */
4467                         at += padded_size;
4468                         break;
4469                         /* Param's with variable size within a range */
4470                 case SCTP_CHUNK_LIST:
4471                 case SCTP_SUPPORTED_CHUNK_EXT:
4472                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4473                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4474                                 goto invalid_size;
4475                         }
4476                         at += padded_size;
4477                         break;
4478                 case SCTP_SUPPORTED_ADDRTYPE:
4479                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4480                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4481                                 goto invalid_size;
4482                         }
4483                         at += padded_size;
4484                         break;
4485                 case SCTP_RANDOM:
4486                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4487                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4488                                 goto invalid_size;
4489                         }
4490                         at += padded_size;
4491                         break;
4492                 case SCTP_SET_PRIM_ADDR:
4493                 case SCTP_DEL_IP_ADDRESS:
4494                 case SCTP_ADD_IP_ADDRESS:
4495                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4496                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4498                                 goto invalid_size;
4499                         }
4500                         at += padded_size;
4501                         break;
4502                         /* Param's with a fixed size */
4503                 case SCTP_IPV4_ADDRESS:
4504                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4505                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4506                                 goto invalid_size;
4507                         }
4508                         at += padded_size;
4509                         break;
4510                 case SCTP_IPV6_ADDRESS:
4511                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4512                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4513                                 goto invalid_size;
4514                         }
4515                         at += padded_size;
4516                         break;
4517                 case SCTP_COOKIE_PRESERVE:
4518                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4519                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4520                                 goto invalid_size;
4521                         }
4522                         at += padded_size;
4523                         break;
4524                 case SCTP_HAS_NAT_SUPPORT:
4525                         *nat_friendly = 1;
4526                         /* fall through */
4527                 case SCTP_ECN_NONCE_SUPPORTED:
4528                 case SCTP_PRSCTP_SUPPORTED:
4529
4530                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4531                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
4532                                 goto invalid_size;
4533                         }
4534                         at += padded_size;
4535                         break;
4536                 case SCTP_ECN_CAPABLE:
4537                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4538                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4539                                 goto invalid_size;
4540                         }
4541                         at += padded_size;
4542                         break;
4543                 case SCTP_ULP_ADAPTATION:
4544                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4545                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4546                                 goto invalid_size;
4547                         }
4548                         at += padded_size;
4549                         break;
4550                 case SCTP_SUCCESS_REPORT:
4551                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4552                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4553                                 goto invalid_size;
4554                         }
4555                         at += padded_size;
4556                         break;
4557                 case SCTP_HOSTNAME_ADDRESS:
4558                         {
4559                                 /* We can NOT handle HOST NAME addresses!! */
4560                                 int l_len;
4561
4562                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4563                                 *abort_processing = 1;
4564                                 if (op_err == NULL) {
4565                                         /* Ok need to try to get a mbuf */
4566 #ifdef INET6
4567                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4568 #else
4569                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4570 #endif
4571                                         l_len += plen;
4572                                         l_len += sizeof(struct sctp_paramhdr);
4573                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4574                                         if (op_err) {
4575                                                 SCTP_BUF_LEN(op_err) = 0;
4576                                                 /*
4577                                                  * pre-reserve space for ip
4578                                                  * and sctp header  and
4579                                                  * chunk hdr
4580                                                  */
4581 #ifdef INET6
4582                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4583 #else
4584                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4585 #endif
4586                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4587                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4588                                         }
4589                                 }
4590                                 if (op_err) {
4591                                         /* If we have space */
4592                                         struct sctp_paramhdr s;
4593
4594                                         if (err_at % 4) {
4595                                                 uint32_t cpthis = 0;
4596
4597                                                 pad_needed = 4 - (err_at % 4);
4598                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4599                                                 err_at += pad_needed;
4600                                         }
4601                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4602                                         s.param_length = htons(sizeof(s) + plen);
4603                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4604                                         err_at += sizeof(s);
4605                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4606                                         if (phdr == NULL) {
4607                                                 sctp_m_freem(op_err);
4608                                                 /*
4609                                                  * we are out of memory but
4610                                                  * we still need to have a
4611                                                  * look at what to do (the
4612                                                  * system is in trouble
4613                                                  * though).
4614                                                  */
4615                                                 return (NULL);
4616                                         }
4617                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4618                                         err_at += plen;
4619                                 }
4620                                 return (op_err);
4621                                 break;
4622                         }
4623                 default:
4624                         /*
4625                          * we do not recognize the parameter figure out what
4626                          * we do.
4627                          */
4628                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4629                         if ((ptype & 0x4000) == 0x4000) {
4630                                 /* Report bit is set?? */
4631                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4632                                 if (op_err == NULL) {
4633                                         int l_len;
4634
4635                                         /* Ok need to try to get an mbuf */
4636 #ifdef INET6
4637                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4638 #else
4639                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4640 #endif
4641                                         l_len += plen;
4642                                         l_len += sizeof(struct sctp_paramhdr);
4643                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4644                                         if (op_err) {
4645                                                 SCTP_BUF_LEN(op_err) = 0;
4646 #ifdef INET6
4647                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4648 #else
4649                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4650 #endif
4651                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4652                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4653                                         }
4654                                 }
4655                                 if (op_err) {
4656                                         /* If we have space */
4657                                         struct sctp_paramhdr s;
4658
4659                                         if (err_at % 4) {
4660                                                 uint32_t cpthis = 0;
4661
4662                                                 pad_needed = 4 - (err_at % 4);
4663                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4664                                                 err_at += pad_needed;
4665                                         }
4666                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4667                                         s.param_length = htons(sizeof(s) + plen);
4668                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4669                                         err_at += sizeof(s);
4670                                         if (plen > sizeof(tempbuf)) {
4671                                                 plen = sizeof(tempbuf);
4672                                         }
4673                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4674                                         if (phdr == NULL) {
4675                                                 sctp_m_freem(op_err);
4676                                                 /*
4677                                                  * we are out of memory but
4678                                                  * we still need to have a
4679                                                  * look at what to do (the
4680                                                  * system is in trouble
4681                                                  * though).
4682                                                  */
4683                                                 op_err = NULL;
4684                                                 goto more_processing;
4685                                         }
4686                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4687                                         err_at += plen;
4688                                 }
4689                         }
4690         more_processing:
4691                         if ((ptype & 0x8000) == 0x0000) {
4692                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4693                                 return (op_err);
4694                         } else {
4695                                 /* skip this chunk and continue processing */
4696                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4697                                 at += SCTP_SIZE32(plen);
4698                         }
4699                         break;
4700
4701                 }
4702                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4703         }
4704         return (op_err);
4705 invalid_size:
4706         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4707         *abort_processing = 1;
4708         if ((op_err == NULL) && phdr) {
4709                 int l_len;
4710
4711 #ifdef INET6
4712                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4713 #else
4714                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4715 #endif
4716                 l_len += (2 * sizeof(struct sctp_paramhdr));
4717                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4718                 if (op_err) {
4719                         SCTP_BUF_LEN(op_err) = 0;
4720 #ifdef INET6
4721                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4722 #else
4723                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4724 #endif
4725                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4726                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4727                 }
4728         }
4729         if ((op_err) && phdr) {
4730                 struct sctp_paramhdr s;
4731
4732                 if (err_at % 4) {
4733                         uint32_t cpthis = 0;
4734
4735                         pad_needed = 4 - (err_at % 4);
4736                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4737                         err_at += pad_needed;
4738                 }
4739                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4740                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4741                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4742                 err_at += sizeof(s);
4743                 /* Only copy back the p-hdr that caused the issue */
4744                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4745         }
4746         return (op_err);
4747 }
4748
4749 static int
4750 sctp_are_there_new_addresses(struct sctp_association *asoc,
4751     struct mbuf *in_initpkt, int iphlen, int offset)
4752 {
4753         /*
4754          * Given a INIT packet, look through the packet to verify that there
4755          * are NO new addresses. As we go through the parameters add reports
4756          * of any un-understood parameters that require an error.  Also we
4757          * must return (1) to drop the packet if we see a un-understood
4758          * parameter that tells us to drop the chunk.
4759          */
4760         struct sockaddr_in sin4, *sa4;
4761
4762 #ifdef INET6
4763         struct sockaddr_in6 sin6, *sa6;
4764
4765 #endif
4766         struct sockaddr *sa_touse;
4767         struct sockaddr *sa;
4768         struct sctp_paramhdr *phdr, params;
4769         struct ip *iph;
4770
4771 #ifdef INET6
4772         struct ip6_hdr *ip6h;
4773
4774 #endif
4775         struct mbuf *mat;
4776         uint16_t ptype, plen;
4777         int err_at;
4778         uint8_t fnd;
4779         struct sctp_nets *net;
4780
4781         memset(&sin4, 0, sizeof(sin4));
4782 #ifdef INET6
4783         memset(&sin6, 0, sizeof(sin6));
4784 #endif
4785         sin4.sin_family = AF_INET;
4786         sin4.sin_len = sizeof(sin4);
4787 #ifdef INET6
4788         sin6.sin6_family = AF_INET6;
4789         sin6.sin6_len = sizeof(sin6);
4790 #endif
4791         sa_touse = NULL;
4792         /* First what about the src address of the pkt ? */
4793         iph = mtod(in_initpkt, struct ip *);
4794         switch (iph->ip_v) {
4795         case IPVERSION:
4796                 /* source addr is IPv4 */
4797                 sin4.sin_addr = iph->ip_src;
4798                 sa_touse = (struct sockaddr *)&sin4;
4799                 break;
4800 #ifdef INET6
4801         case IPV6_VERSION >> 4:
4802                 /* source addr is IPv6 */
4803                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4804                 sin6.sin6_addr = ip6h->ip6_src;
4805                 sa_touse = (struct sockaddr *)&sin6;
4806                 break;
4807 #endif
4808         default:
4809                 return (1);
4810         }
4811
4812         fnd = 0;
4813         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4814                 sa = (struct sockaddr *)&net->ro._l_addr;
4815                 if (sa->sa_family == sa_touse->sa_family) {
4816                         if (sa->sa_family == AF_INET) {
4817                                 sa4 = (struct sockaddr_in *)sa;
4818                                 if (sa4->sin_addr.s_addr ==
4819                                     sin4.sin_addr.s_addr) {
4820                                         fnd = 1;
4821                                         break;
4822                                 }
4823                         }
4824 #ifdef INET6
4825                         if (sa->sa_family == AF_INET6) {
4826                                 sa6 = (struct sockaddr_in6 *)sa;
4827                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4828                                     &sin6)) {
4829                                         fnd = 1;
4830                                         break;
4831                                 }
4832                         }
4833 #endif
4834                 }
4835         }
4836         if (fnd == 0) {
4837                 /* New address added! no need to look futher. */
4838                 return (1);
4839         }
4840         /* Ok so far lets munge through the rest of the packet */
4841         mat = in_initpkt;
4842         err_at = 0;
4843         sa_touse = NULL;
4844         offset += sizeof(struct sctp_init_chunk);
4845         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4846         while (phdr) {
4847                 ptype = ntohs(phdr->param_type);
4848                 plen = ntohs(phdr->param_length);
4849                 if (ptype == SCTP_IPV4_ADDRESS) {
4850                         struct sctp_ipv4addr_param *p4, p4_buf;
4851
4852                         phdr = sctp_get_next_param(mat, offset,
4853                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4854                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4855                             phdr == NULL) {
4856                                 return (1);
4857                         }
4858                         p4 = (struct sctp_ipv4addr_param *)phdr;
4859                         sin4.sin_addr.s_addr = p4->addr;
4860                         sa_touse = (struct sockaddr *)&sin4;
4861                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4862                         struct sctp_ipv6addr_param *p6, p6_buf;
4863
4864                         phdr = sctp_get_next_param(mat, offset,
4865                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4866                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4867                             phdr == NULL) {
4868                                 return (1);
4869                         }
4870                         p6 = (struct sctp_ipv6addr_param *)phdr;
4871 #ifdef INET6
4872                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4873                             sizeof(p6->addr));
4874 #endif
4875                         sa_touse = (struct sockaddr *)&sin4;
4876                 }
4877                 if (sa_touse) {
4878                         /* ok, sa_touse points to one to check */
4879                         fnd = 0;
4880                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4881                                 sa = (struct sockaddr *)&net->ro._l_addr;
4882                                 if (sa->sa_family != sa_touse->sa_family) {
4883                                         continue;
4884                                 }
4885                                 if (sa->sa_family == AF_INET) {
4886                                         sa4 = (struct sockaddr_in *)sa;
4887                                         if (sa4->sin_addr.s_addr ==
4888                                             sin4.sin_addr.s_addr) {
4889                                                 fnd = 1;
4890                                                 break;
4891                                         }
4892                                 }
4893 #ifdef INET6
4894                                 if (sa->sa_family == AF_INET6) {
4895                                         sa6 = (struct sockaddr_in6 *)sa;
4896                                         if (SCTP6_ARE_ADDR_EQUAL(
4897                                             sa6, &sin6)) {
4898                                                 fnd = 1;
4899                                                 break;
4900                                         }
4901                                 }
4902 #endif
4903                         }
4904                         if (!fnd) {
4905                                 /* New addr added! no need to look further */
4906                                 return (1);
4907                         }
4908                 }
4909                 offset += SCTP_SIZE32(plen);
4910                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4911         }
4912         return (0);
4913 }
4914
4915 /*
4916  * Given a MBUF chain that was sent into us containing an INIT. Build a
4917  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4918  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4919  * message (i.e. the struct sctp_init_msg).
4920  */
4921 void
4922 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4923     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4924     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4925 {
4926         struct sctp_association *asoc;
4927         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4928         struct sctp_init_ack_chunk *initack;
4929         struct sctp_adaptation_layer_indication *ali;
4930         struct sctp_ecn_supported_param *ecn;
4931         struct sctp_prsctp_supported_param *prsctp;
4932         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4933         struct sctp_supported_chunk_types_param *pr_supported;
4934         union sctp_sockstore store, store1, *over_addr;
4935         struct sockaddr_in *sin, *to_sin;
4936
4937 #ifdef INET6
4938         struct sockaddr_in6 *sin6, *to_sin6;
4939
4940 #endif
4941         struct ip *iph;
4942
4943 #ifdef INET6
4944         struct ip6_hdr *ip6;
4945
4946 #endif
4947         struct sockaddr *to;
4948         struct sctp_state_cookie stc;
4949         struct sctp_nets *net = NULL;
4950         uint8_t *signature = NULL;
4951         int cnt_inits_to = 0;
4952         uint16_t his_limit, i_want;
4953         int abort_flag, padval;
4954         int num_ext;
4955         int p_len;
4956         int nat_friendly = 0;
4957         struct socket *so;
4958
4959         if (stcb)
4960                 asoc = &stcb->asoc;
4961         else
4962                 asoc = NULL;
4963         mp_last = NULL;
4964         if ((asoc != NULL) &&
4965             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4966             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4967                 /* new addresses, out of here in non-cookie-wait states */
4968                 /*
4969                  * Send a ABORT, we don't add the new address error clause
4970                  * though we even set the T bit and copy in the 0 tag.. this
4971                  * looks no different than if no listener was present.
4972                  */
4973                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4974                 return;
4975         }
4976         abort_flag = 0;
4977         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4978             (offset + sizeof(struct sctp_init_chunk)),
4979             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4980         if (abort_flag) {
4981 do_a_abort:
4982                 sctp_send_abort(init_pkt, iphlen, sh,
4983                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4984                 return;
4985         }
4986         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4987         if (m == NULL) {
4988                 /* No memory, INIT timer will re-attempt. */
4989                 if (op_err)
4990                         sctp_m_freem(op_err);
4991                 return;
4992         }
4993         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4994
4995         /* the time I built cookie */
4996         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4997
4998         /* populate any tie tags */
4999         if (asoc != NULL) {
5000                 /* unlock before tag selections */
5001                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5002                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5003                 stc.cookie_life = asoc->cookie_life;
5004                 net = asoc->primary_destination;
5005         } else {
5006                 stc.tie_tag_my_vtag = 0;
5007                 stc.tie_tag_peer_vtag = 0;
5008                 /* life I will award this cookie */
5009                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5010         }
5011
5012         /* copy in the ports for later check */
5013         stc.myport = sh->dest_port;
5014         stc.peerport = sh->src_port;
5015
5016         /*
5017          * If we wanted to honor cookie life extentions, we would add to
5018          * stc.cookie_life. For now we should NOT honor any extension
5019          */
5020         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5021         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5022                 struct inpcb *in_inp;
5023
5024                 /* Its a V6 socket */
5025                 in_inp = (struct inpcb *)inp;
5026                 stc.ipv6_addr_legal = 1;
5027                 /* Now look at the binding flag to see if V4 will be legal */
5028                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5029                         stc.ipv4_addr_legal = 1;
5030                 } else {
5031                         /* V4 addresses are NOT legal on the association */
5032                         stc.ipv4_addr_legal = 0;
5033                 }
5034         } else {
5035                 /* Its a V4 socket, no - V6 */
5036                 stc.ipv4_addr_legal = 1;
5037                 stc.ipv6_addr_legal = 0;
5038         }
5039
5040 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5041         stc.ipv4_scope = 1;
5042 #else
5043         stc.ipv4_scope = 0;
5044 #endif
5045         /* now for scope setup */
5046         memset((caddr_t)&store, 0, sizeof(store));
5047         memset((caddr_t)&store1, 0, sizeof(store1));
5048         sin = &store.sin;
5049         to_sin = &store1.sin;
5050 #ifdef INET6
5051         sin6 = &store.sin6;
5052         to_sin6 = &store1.sin6;
5053 #endif
5054         iph = mtod(init_pkt, struct ip *);
5055         /* establish the to_addr's */
5056         switch (iph->ip_v) {
5057         case IPVERSION:
5058                 to_sin->sin_port = sh->dest_port;
5059                 to_sin->sin_family = AF_INET;
5060                 to_sin->sin_len = sizeof(struct sockaddr_in);
5061                 to_sin->sin_addr = iph->ip_dst;
5062                 break;
5063 #ifdef INET6
5064         case IPV6_VERSION >> 4:
5065                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5066                 to_sin6->sin6_addr = ip6->ip6_dst;
5067                 to_sin6->sin6_scope_id = 0;
5068                 to_sin6->sin6_port = sh->dest_port;
5069                 to_sin6->sin6_family = AF_INET6;
5070                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5071                 break;
5072 #endif
5073         default:
5074                 goto do_a_abort;
5075                 break;
5076         };
5077
5078         if (net == NULL) {
5079                 to = (struct sockaddr *)&store;
5080                 switch (iph->ip_v) {
5081                 case IPVERSION:
5082                         {
5083                                 sin->sin_family = AF_INET;
5084                                 sin->sin_len = sizeof(struct sockaddr_in);
5085                                 sin->sin_port = sh->src_port;
5086                                 sin->sin_addr = iph->ip_src;
5087                                 /* lookup address */
5088                                 stc.address[0] = sin->sin_addr.s_addr;
5089                                 stc.address[1] = 0;
5090                                 stc.address[2] = 0;
5091                                 stc.address[3] = 0;
5092                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5093                                 /* local from address */
5094                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5095                                 stc.laddress[1] = 0;
5096                                 stc.laddress[2] = 0;
5097                                 stc.laddress[3] = 0;
5098                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5099                                 /* scope_id is only for v6 */
5100                                 stc.scope_id = 0;
5101 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5102                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5103                                         stc.ipv4_scope = 1;
5104                                 }
5105 #else
5106                                 stc.ipv4_scope = 1;
5107 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5108                                 /* Must use the address in this case */
5109                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5110                                         stc.loopback_scope = 1;
5111                                         stc.ipv4_scope = 1;
5112                                         stc.site_scope = 1;
5113                                         stc.local_scope = 0;
5114                                 }
5115                                 break;
5116                         }
5117 #ifdef INET6
5118                 case IPV6_VERSION >> 4:
5119                         {
5120                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5121                                 sin6->sin6_family = AF_INET6;
5122                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5123                                 sin6->sin6_port = sh->src_port;
5124                                 sin6->sin6_addr = ip6->ip6_src;
5125                                 /* lookup address */
5126                                 memcpy(&stc.address, &sin6->sin6_addr,
5127                                     sizeof(struct in6_addr));
5128                                 sin6->sin6_scope_id = 0;
5129                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5130                                 stc.scope_id = 0;
5131                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5132                                         /*
5133                                          * FIX ME: does this have scope from
5134                                          * rcvif?
5135                                          */
5136                                         (void)sa6_recoverscope(sin6);
5137                                         stc.scope_id = sin6->sin6_scope_id;
5138                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5139                                         stc.loopback_scope = 1;
5140                                         stc.local_scope = 0;
5141                                         stc.site_scope = 1;
5142                                         stc.ipv4_scope = 1;
5143                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5144                                         /*
5145                                          * If the new destination is a
5146                                          * LINK_LOCAL we must have common
5147                                          * both site and local scope. Don't
5148                                          * set local scope though since we
5149                                          * must depend on the source to be
5150                                          * added implicitly. We cannot
5151                                          * assure just because we share one
5152                                          * link that all links are common.
5153                                          */
5154                                         stc.local_scope = 0;
5155                                         stc.site_scope = 1;
5156                                         stc.ipv4_scope = 1;
5157                                         /*
5158                                          * we start counting for the private
5159                                          * address stuff at 1. since the
5160                                          * link local we source from won't
5161                                          * show up in our scoped count.
5162                                          */
5163                                         cnt_inits_to = 1;
5164                                         /*
5165                                          * pull out the scope_id from
5166                                          * incoming pkt
5167                                          */
5168                                         /*
5169                                          * FIX ME: does this have scope from
5170                                          * rcvif?
5171                                          */
5172                                         (void)sa6_recoverscope(sin6);
5173                                         stc.scope_id = sin6->sin6_scope_id;
5174                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5175                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5176                                         /*
5177                                          * If the new destination is
5178                                          * SITE_LOCAL then we must have site
5179                                          * scope in common.
5180                                          */
5181                                         stc.site_scope = 1;
5182                                 }
5183                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5184                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5185                                 break;
5186                         }
5187 #endif
5188                 default:
5189                         /* TSNH */
5190                         goto do_a_abort;
5191                         break;
5192                 }
5193         } else {
5194                 /* set the scope per the existing tcb */
5195
5196 #ifdef INET6
5197                 struct sctp_nets *lnet;
5198
5199 #endif
5200
5201                 stc.loopback_scope = asoc->loopback_scope;
5202                 stc.ipv4_scope = asoc->ipv4_local_scope;
5203                 stc.site_scope = asoc->site_scope;
5204                 stc.local_scope = asoc->local_scope;
5205 #ifdef INET6
5206                 /* Why do we not consider IPv4 LL addresses? */
5207                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5208                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5209                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5210                                         /*
5211                                          * if we have a LL address, start
5212                                          * counting at 1.
5213                                          */
5214                                         cnt_inits_to = 1;
5215                                 }
5216                         }
5217                 }
5218 #endif
5219                 /* use the net pointer */
5220                 to = (struct sockaddr *)&net->ro._l_addr;
5221                 switch (to->sa_family) {
5222                 case AF_INET:
5223                         sin = (struct sockaddr_in *)to;
5224                         stc.address[0] = sin->sin_addr.s_addr;
5225                         stc.address[1] = 0;
5226                         stc.address[2] = 0;
5227                         stc.address[3] = 0;
5228                         stc.addr_type = SCTP_IPV4_ADDRESS;
5229                         if (net->src_addr_selected == 0) {
5230                                 /*
5231                                  * strange case here, the INIT should have
5232                                  * did the selection.
5233                                  */
5234                                 net->ro._s_addr = sctp_source_address_selection(inp,
5235                                     stcb, (sctp_route_t *) & net->ro,
5236                                     net, 0, vrf_id);
5237                                 if (net->ro._s_addr == NULL)
5238                                         return;
5239
5240                                 net->src_addr_selected = 1;
5241
5242                         }
5243                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5244                         stc.laddress[1] = 0;
5245                         stc.laddress[2] = 0;
5246                         stc.laddress[3] = 0;
5247                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5248                         break;
5249 #ifdef INET6
5250                 case AF_INET6:
5251                         sin6 = (struct sockaddr_in6 *)to;
5252                         memcpy(&stc.address, &sin6->sin6_addr,
5253                             sizeof(struct in6_addr));
5254                         stc.addr_type = SCTP_IPV6_ADDRESS;
5255                         if (net->src_addr_selected == 0) {
5256                                 /*
5257                                  * strange case here, the INIT should have
5258                                  * did the selection.
5259                                  */
5260                                 net->ro._s_addr = sctp_source_address_selection(inp,
5261                                     stcb, (sctp_route_t *) & net->ro,
5262                                     net, 0, vrf_id);
5263                                 if (net->ro._s_addr == NULL)
5264                                         return;
5265
5266                                 net->src_addr_selected = 1;
5267                         }
5268                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5269                             sizeof(struct in6_addr));
5270                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5271                         break;
5272 #endif
5273                 }
5274         }
5275         /* Now lets put the SCTP header in place */
5276         initack = mtod(m, struct sctp_init_ack_chunk *);
5277         /* Save it off for quick ref */
5278         stc.peers_vtag = init_chk->init.initiate_tag;
5279         /* who are we */
5280         memcpy(stc.identification, SCTP_VERSION_STRING,
5281             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5282         /* now the chunk header */
5283         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5284         initack->ch.chunk_flags = 0;
5285         /* fill in later from mbuf we build */
5286         initack->ch.chunk_length = 0;
5287         /* place in my tag */
5288         if ((asoc != NULL) &&
5289             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5290             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5291             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5292                 /* re-use the v-tags and init-seq here */
5293                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5294                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5295         } else {
5296                 uint32_t vtag, itsn;
5297
5298                 if (hold_inp_lock) {
5299                         SCTP_INP_INCR_REF(inp);
5300                         SCTP_INP_RUNLOCK(inp);
5301                 }
5302                 if (asoc) {
5303                         atomic_add_int(&asoc->refcnt, 1);
5304                         SCTP_TCB_UNLOCK(stcb);
5305         new_tag:
5306                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5307                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5308                                 /*
5309                                  * Got a duplicate vtag on some guy behind a
5310                                  * nat make sure we don't use it.
5311                                  */
5312                                 goto new_tag;
5313                         }
5314                         initack->init.initiate_tag = htonl(vtag);
5315                         /* get a TSN to use too */
5316                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5317                         initack->init.initial_tsn = htonl(itsn);
5318                         SCTP_TCB_LOCK(stcb);
5319                         atomic_add_int(&asoc->refcnt, -1);
5320                 } else {
5321                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5322                         initack->init.initiate_tag = htonl(vtag);
5323                         /* get a TSN to use too */
5324                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5325                 }
5326                 if (hold_inp_lock) {
5327                         SCTP_INP_RLOCK(inp);
5328                         SCTP_INP_DECR_REF(inp);
5329                 }
5330         }
5331         /* save away my tag to */
5332         stc.my_vtag = initack->init.initiate_tag;
5333
5334         /* set up some of the credits. */
5335         so = inp->sctp_socket;
5336         if (so == NULL) {
5337                 /* memory problem */
5338                 sctp_m_freem(m);
5339                 return;
5340         } else {
5341                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5342         }
5343         /* set what I want */
5344         his_limit = ntohs(init_chk->init.num_inbound_streams);
5345         /* choose what I want */
5346         if (asoc != NULL) {
5347                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5348                         i_want = asoc->streamoutcnt;
5349                 } else {
5350                         i_want = inp->sctp_ep.pre_open_stream_count;
5351                 }
5352         } else {
5353                 i_want = inp->sctp_ep.pre_open_stream_count;
5354         }
5355         if (his_limit < i_want) {
5356                 /* I Want more :< */
5357                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5358         } else {
5359                 /* I can have what I want :> */
5360                 initack->init.num_outbound_streams = htons(i_want);
5361         }
5362         /* tell him his limt. */
5363         initack->init.num_inbound_streams =
5364             htons(inp->sctp_ep.max_open_streams_intome);
5365
5366         /* adaptation layer indication parameter */
5367         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5368         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5369         ali->ph.param_length = htons(sizeof(*ali));
5370         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5371         SCTP_BUF_LEN(m) += sizeof(*ali);
5372         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5373
5374         /* ECN parameter */
5375         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5376                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5377                 ecn->ph.param_length = htons(sizeof(*ecn));
5378                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5379
5380                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5381                     sizeof(*ecn));
5382         } else {
5383                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5384         }
5385         /* And now tell the peer we do  pr-sctp */
5386         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5387         prsctp->ph.param_length = htons(sizeof(*prsctp));
5388         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5389         if (nat_friendly) {
5390                 /* Add NAT friendly parameter */
5391                 struct sctp_paramhdr *ph;
5392
5393                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5394                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5395                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5396                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5397         }
5398         /* And now tell the peer we do all the extensions */
5399         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5400         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5401         num_ext = 0;
5402         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5403         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5404         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5405         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5406         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5407         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5408                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5409         /*
5410          * EY  if the sysctl variable is set, tell the assoc. initiator that
5411          * we do nr_sack
5412          */
5413         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5414                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5415         p_len = sizeof(*pr_supported) + num_ext;
5416         pr_supported->ph.param_length = htons(p_len);
5417         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5418         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5419
5420         /* ECN nonce: And now tell the peer we support ECN nonce */
5421         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5422                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5423                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5424                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5425                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5426                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5427         }
5428         /* add authentication parameters */
5429         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5430                 struct sctp_auth_random *randp;
5431                 struct sctp_auth_hmac_algo *hmacs;
5432                 struct sctp_auth_chunk_list *chunks;
5433                 uint16_t random_len;
5434
5435                 /* generate and add RANDOM parameter */
5436                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5437                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5438                 randp->ph.param_type = htons(SCTP_RANDOM);
5439                 p_len = sizeof(*randp) + random_len;
5440                 randp->ph.param_length = htons(p_len);
5441                 SCTP_READ_RANDOM(randp->random_data, random_len);
5442                 /* zero out any padding required */
5443                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5444                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5445
5446                 /* add HMAC_ALGO parameter */
5447                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5448                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5449                     (uint8_t *) hmacs->hmac_ids);
5450                 if (p_len > 0) {
5451                         p_len += sizeof(*hmacs);
5452                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5453                         hmacs->ph.param_length = htons(p_len);
5454                         /* zero out any padding required */
5455                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5456                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5457                 }
5458                 /* add CHUNKS parameter */
5459                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5460                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5461                     chunks->chunk_types);
5462                 if (p_len > 0) {
5463                         p_len += sizeof(*chunks);
5464                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5465                         chunks->ph.param_length = htons(p_len);
5466                         /* zero out any padding required */
5467                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5468                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5469                 }
5470         }
5471         m_at = m;
5472         /* now the addresses */
5473         {
5474                 struct sctp_scoping scp;
5475
5476                 /*
5477                  * To optimize this we could put the scoping stuff into a
5478                  * structure and remove the individual uint8's from the stc
5479                  * structure. Then we could just sifa in the address within
5480                  * the stc.. but for now this is a quick hack to get the
5481                  * address stuff teased apart.
5482                  */
5483                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5484                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5485                 scp.loopback_scope = stc.loopback_scope;
5486                 scp.ipv4_local_scope = stc.ipv4_scope;
5487                 scp.local_scope = stc.local_scope;
5488                 scp.site_scope = stc.site_scope;
5489                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5490         }
5491
5492         /* tack on the operational error if present */
5493         if (op_err) {
5494                 struct mbuf *ol;
5495                 int llen;
5496
5497                 llen = 0;
5498                 ol = op_err;
5499                 while (ol) {
5500                         llen += SCTP_BUF_LEN(ol);
5501                         ol = SCTP_BUF_NEXT(ol);
5502                 }
5503                 if (llen % 4) {
5504                         /* must add a pad to the param */
5505                         uint32_t cpthis = 0;
5506                         int padlen;
5507
5508                         padlen = 4 - (llen % 4);
5509                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5510                 }
5511                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5512                         m_at = SCTP_BUF_NEXT(m_at);
5513                 }
5514                 SCTP_BUF_NEXT(m_at) = op_err;
5515                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5516                         m_at = SCTP_BUF_NEXT(m_at);
5517                 }
5518         }
5519         /* pre-calulate the size and update pkt header and chunk header */
5520         p_len = 0;
5521         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5522                 p_len += SCTP_BUF_LEN(m_tmp);
5523                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5524                         /* m_tmp should now point to last one */
5525                         break;
5526                 }
5527         }
5528
5529         /* Now we must build a cookie */
5530         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5531         if (m_cookie == NULL) {
5532                 /* memory problem */
5533                 sctp_m_freem(m);
5534                 return;
5535         }
5536         /* Now append the cookie to the end and update the space/size */
5537         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5538
5539         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5540                 p_len += SCTP_BUF_LEN(m_tmp);
5541                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5542                         /* m_tmp should now point to last one */
5543                         mp_last = m_tmp;
5544                         break;
5545                 }
5546         }
5547         /*
5548          * Place in the size, but we don't include the last pad (if any) in
5549          * the INIT-ACK.
5550          */
5551         initack->ch.chunk_length = htons(p_len);
5552
5553         /*
5554          * Time to sign the cookie, we don't sign over the cookie signature
5555          * though thus we set trailer.
5556          */
5557         (void)sctp_hmac_m(SCTP_HMAC,
5558             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5559             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5560             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5561         /*
5562          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5563          * here since the timer will drive a retranmission.
5564          */
5565         padval = p_len % 4;
5566         if ((padval) && (mp_last)) {
5567                 /* see my previous comments on mp_last */
5568                 int ret;
5569
5570                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5571                 if (ret) {
5572                         /* Houston we have a problem, no space */
5573                         sctp_m_freem(m);
5574                         return;
5575                 }
5576                 p_len += padval;
5577         }
5578         if (stc.loopback_scope) {
5579                 over_addr = &store1;
5580         } else {
5581                 over_addr = NULL;
5582         }
5583
5584         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5585             0, NULL, 0,
5586             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5587             port, SCTP_SO_NOT_LOCKED, over_addr);
5588         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5589 }
5590
5591
5592 void
5593 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5594     struct sctp_association *asoc,
5595     struct sctp_stream_out *strq, int holds_lock)
5596 {
5597         if (holds_lock == 0) {
5598                 SCTP_TCB_SEND_LOCK(stcb);
5599         }
5600         if ((strq->next_spoke.tqe_next == NULL) &&
5601             (strq->next_spoke.tqe_prev == NULL)) {
5602                 TAILQ_INSERT_TAIL(&asoc->out_wheel, strq, next_spoke);
5603         }
5604         if (holds_lock == 0) {
5605                 SCTP_TCB_SEND_UNLOCK(stcb);
5606         }
5607 }
5608
5609 void
5610 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5611     struct sctp_association *asoc,
5612     struct sctp_stream_out *strq,
5613     int holds_lock)
5614 {
5615         /* take off and then setup so we know it is not on the wheel */
5616         if (holds_lock == 0) {
5617                 SCTP_TCB_SEND_LOCK(stcb);
5618         }
5619         if (TAILQ_EMPTY(&strq->outqueue)) {
5620                 if (asoc->last_out_stream == strq) {
5621                         asoc->last_out_stream = TAILQ_PREV(asoc->last_out_stream, sctpwheel_listhead, next_spoke);
5622                         if (asoc->last_out_stream == NULL) {
5623                                 asoc->last_out_stream = TAILQ_LAST(&asoc->out_wheel, sctpwheel_listhead);
5624                         }
5625                         if (asoc->last_out_stream == strq) {
5626                                 asoc->last_out_stream = NULL;
5627                         }
5628                 }
5629                 TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5630                 strq->next_spoke.tqe_next = NULL;
5631                 strq->next_spoke.tqe_prev = NULL;
5632         }
5633         if (holds_lock == 0) {
5634                 SCTP_TCB_SEND_UNLOCK(stcb);
5635         }
5636 }
5637
5638 static void
5639 sctp_prune_prsctp(struct sctp_tcb *stcb,
5640     struct sctp_association *asoc,
5641     struct sctp_sndrcvinfo *srcv,
5642     int dataout)
5643 {
5644         int freed_spc = 0;
5645         struct sctp_tmit_chunk *chk, *nchk;
5646
5647         SCTP_TCB_LOCK_ASSERT(stcb);
5648         if ((asoc->peer_supports_prsctp) &&
5649             (asoc->sent_queue_cnt_removeable > 0)) {
5650                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5651                         /*
5652                          * Look for chunks marked with the PR_SCTP flag AND
5653                          * the buffer space flag. If the one being sent is
5654                          * equal or greater priority then purge the old one
5655                          * and free some space.
5656                          */
5657                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5658                                 /*
5659                                  * This one is PR-SCTP AND buffer space
5660                                  * limited type
5661                                  */
5662                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5663                                         /*
5664                                          * Lower numbers equates to higher
5665                                          * priority so if the one we are
5666                                          * looking at has a larger or equal
5667                                          * priority we want to drop the data
5668                                          * and NOT retransmit it.
5669                                          */
5670                                         if (chk->data) {
5671                                                 /*
5672                                                  * We release the book_size
5673                                                  * if the mbuf is here
5674                                                  */
5675                                                 int ret_spc;
5676                                                 int cause;
5677
5678                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5679                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5680                                                 else
5681                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5682                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5683                                                     cause,
5684                                                     SCTP_SO_LOCKED);
5685                                                 freed_spc += ret_spc;
5686                                                 if (freed_spc >= dataout) {
5687                                                         return;
5688                                                 }
5689                                         }       /* if chunk was present */
5690                                 }       /* if of sufficent priority */
5691                         }       /* if chunk has enabled */
5692                 }               /* tailqforeach */
5693
5694                 chk = TAILQ_FIRST(&asoc->send_queue);
5695                 while (chk) {
5696                         nchk = TAILQ_NEXT(chk, sctp_next);
5697                         /* Here we must move to the sent queue and mark */
5698                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5699                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5700                                         if (chk->data) {
5701                                                 /*
5702                                                  * We release the book_size
5703                                                  * if the mbuf is here
5704                                                  */
5705                                                 int ret_spc;
5706
5707                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5708                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5709                                                     SCTP_SO_LOCKED);
5710
5711                                                 freed_spc += ret_spc;
5712                                                 if (freed_spc >= dataout) {
5713                                                         return;
5714                                                 }
5715                                         }       /* end if chk->data */
5716                                 }       /* end if right class */
5717                         }       /* end if chk pr-sctp */
5718                         chk = nchk;
5719                 }               /* end while (chk) */
5720         }                       /* if enabled in asoc */
5721 }
5722
5723 int
5724 sctp_get_frag_point(struct sctp_tcb *stcb,
5725     struct sctp_association *asoc)
5726 {
5727         int siz, ovh;
5728
5729         /*
5730          * For endpoints that have both v6 and v4 addresses we must reserve
5731          * room for the ipv6 header, for those that are only dealing with V4
5732          * we use a larger frag point.
5733          */
5734         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5735                 ovh = SCTP_MED_OVERHEAD;
5736         } else {
5737                 ovh = SCTP_MED_V4_OVERHEAD;
5738         }
5739
5740         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5741                 siz = asoc->smallest_mtu - ovh;
5742         else
5743                 siz = (stcb->asoc.sctp_frag_point - ovh);
5744         /*
5745          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5746          */
5747         /* A data chunk MUST fit in a cluster */
5748         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5749         /* } */
5750
5751         /* adjust for an AUTH chunk if DATA requires auth */
5752         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5753                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5754
5755         if (siz % 4) {
5756                 /* make it an even word boundary please */
5757                 siz -= (siz % 4);
5758         }
5759         return (siz);
5760 }
5761
5762 static void
5763 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5764 {
5765         sp->pr_sctp_on = 0;
5766         /*
5767          * We assume that the user wants PR_SCTP_TTL if the user provides a
5768          * positive lifetime but does not specify any PR_SCTP policy. This
5769          * is a BAD assumption and causes problems at least with the
5770          * U-Vancovers MPI folks. I will change this to be no policy means
5771          * NO PR-SCTP.
5772          */
5773         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5774                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5775                 sp->pr_sctp_on = 1;
5776         } else {
5777                 return;
5778         }
5779         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5780         case CHUNK_FLAGS_PR_SCTP_BUF:
5781                 /*
5782                  * Time to live is a priority stored in tv_sec when doing
5783                  * the buffer drop thing.
5784                  */
5785                 sp->ts.tv_sec = sp->timetolive;
5786                 sp->ts.tv_usec = 0;
5787                 break;
5788         case CHUNK_FLAGS_PR_SCTP_TTL:
5789                 {
5790                         struct timeval tv;
5791
5792                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5793                         tv.tv_sec = sp->timetolive / 1000;
5794                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5795                         /*
5796                          * TODO sctp_constants.h needs alternative time
5797                          * macros when _KERNEL is undefined.
5798                          */
5799                         timevaladd(&sp->ts, &tv);
5800                 }
5801                 break;
5802         case CHUNK_FLAGS_PR_SCTP_RTX:
5803                 /*
5804                  * Time to live is a the number or retransmissions stored in
5805                  * tv_sec.
5806                  */
5807                 sp->ts.tv_sec = sp->timetolive;
5808                 sp->ts.tv_usec = 0;
5809                 break;
5810         default:
5811                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5812                     "Unknown PR_SCTP policy %u.\n",
5813                     PR_SCTP_POLICY(sp->sinfo_flags));
5814                 break;
5815         }
5816 }
5817
5818 static int
5819 sctp_msg_append(struct sctp_tcb *stcb,
5820     struct sctp_nets *net,
5821     struct mbuf *m,
5822     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5823 {
5824         int error = 0, holds_lock;
5825         struct mbuf *at;
5826         struct sctp_stream_queue_pending *sp = NULL;
5827         struct sctp_stream_out *strm;
5828
5829         /*
5830          * Given an mbuf chain, put it into the association send queue and
5831          * place it on the wheel
5832          */
5833         holds_lock = hold_stcb_lock;
5834         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5835                 /* Invalid stream number */
5836                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5837                 error = EINVAL;
5838                 goto out_now;
5839         }
5840         if ((stcb->asoc.stream_locked) &&
5841             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5842                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5843                 error = EINVAL;
5844                 goto out_now;
5845         }
5846         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5847         /* Now can we send this? */
5848         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5849             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5850             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5851             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5852                 /* got data while shutting down */
5853                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5854                 error = ECONNRESET;
5855                 goto out_now;
5856         }
5857         sctp_alloc_a_strmoq(stcb, sp);
5858         if (sp == NULL) {
5859                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5860                 error = ENOMEM;
5861                 goto out_now;
5862         }
5863         sp->sinfo_flags = srcv->sinfo_flags;
5864         sp->timetolive = srcv->sinfo_timetolive;
5865         sp->ppid = srcv->sinfo_ppid;
5866         sp->context = srcv->sinfo_context;
5867         sp->strseq = 0;
5868         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5869                 sp->net = net;
5870         } else {
5871                 sp->net = stcb->asoc.primary_destination;
5872         }
5873         atomic_add_int(&sp->net->ref_count, 1);
5874         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5875         sp->stream = srcv->sinfo_stream;
5876         sp->msg_is_complete = 1;
5877         sp->sender_all_done = 1;
5878         sp->some_taken = 0;
5879         sp->data = m;
5880         sp->tail_mbuf = NULL;
5881         sp->length = 0;
5882         at = m;
5883         sctp_set_prsctp_policy(sp);
5884         /*
5885          * We could in theory (for sendall) sifa the length in, but we would
5886          * still have to hunt through the chain since we need to setup the
5887          * tail_mbuf
5888          */
5889         while (at) {
5890                 if (SCTP_BUF_NEXT(at) == NULL)
5891                         sp->tail_mbuf = at;
5892                 sp->length += SCTP_BUF_LEN(at);
5893                 at = SCTP_BUF_NEXT(at);
5894         }
5895         SCTP_TCB_SEND_LOCK(stcb);
5896         sctp_snd_sb_alloc(stcb, sp->length);
5897         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5898         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5899         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5900                 sp->strseq = strm->next_sequence_sent;
5901                 strm->next_sequence_sent++;
5902         }
5903         if ((strm->next_spoke.tqe_next == NULL) &&
5904             (strm->next_spoke.tqe_prev == NULL)) {
5905                 /* Not on wheel, insert */
5906                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5907         }
5908         m = NULL;
5909         SCTP_TCB_SEND_UNLOCK(stcb);
5910 out_now:
5911         if (m) {
5912                 sctp_m_freem(m);
5913         }
5914         return (error);
5915 }
5916
5917
5918 static struct mbuf *
5919 sctp_copy_mbufchain(struct mbuf *clonechain,
5920     struct mbuf *outchain,
5921     struct mbuf **endofchain,
5922     int can_take_mbuf,
5923     int sizeofcpy,
5924     uint8_t copy_by_ref)
5925 {
5926         struct mbuf *m;
5927         struct mbuf *appendchain;
5928         caddr_t cp;
5929         int len;
5930
5931         if (endofchain == NULL) {
5932                 /* error */
5933 error_out:
5934                 if (outchain)
5935                         sctp_m_freem(outchain);
5936                 return (NULL);
5937         }
5938         if (can_take_mbuf) {
5939                 appendchain = clonechain;
5940         } else {
5941                 if (!copy_by_ref &&
5942                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5943                     ) {
5944                         /* Its not in a cluster */
5945                         if (*endofchain == NULL) {
5946                                 /* lets get a mbuf cluster */
5947                                 if (outchain == NULL) {
5948                                         /* This is the general case */
5949                         new_mbuf:
5950                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5951                                         if (outchain == NULL) {
5952                                                 goto error_out;
5953                                         }
5954                                         SCTP_BUF_LEN(outchain) = 0;
5955                                         *endofchain = outchain;
5956                                         /* get the prepend space */
5957                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5958                                 } else {
5959                                         /*
5960                                          * We really should not get a NULL
5961                                          * in endofchain
5962                                          */
5963                                         /* find end */
5964                                         m = outchain;
5965                                         while (m) {
5966                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5967                                                         *endofchain = m;
5968                                                         break;
5969                                                 }
5970                                                 m = SCTP_BUF_NEXT(m);
5971                                         }
5972                                         /* sanity */
5973                                         if (*endofchain == NULL) {
5974                                                 /*
5975                                                  * huh, TSNH XXX maybe we
5976                                                  * should panic
5977                                                  */
5978                                                 sctp_m_freem(outchain);
5979                                                 goto new_mbuf;
5980                                         }
5981                                 }
5982                                 /* get the new end of length */
5983                                 len = M_TRAILINGSPACE(*endofchain);
5984                         } else {
5985                                 /* how much is left at the end? */
5986                                 len = M_TRAILINGSPACE(*endofchain);
5987                         }
5988                         /* Find the end of the data, for appending */
5989                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5990
5991                         /* Now lets copy it out */
5992                         if (len >= sizeofcpy) {
5993                                 /* It all fits, copy it in */
5994                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5995                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5996                         } else {
5997                                 /* fill up the end of the chain */
5998                                 if (len > 0) {
5999                                         m_copydata(clonechain, 0, len, cp);
6000                                         SCTP_BUF_LEN((*endofchain)) += len;
6001                                         /* now we need another one */
6002                                         sizeofcpy -= len;
6003                                 }
6004                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6005                                 if (m == NULL) {
6006                                         /* We failed */
6007                                         goto error_out;
6008                                 }
6009                                 SCTP_BUF_NEXT((*endofchain)) = m;
6010                                 *endofchain = m;
6011                                 cp = mtod((*endofchain), caddr_t);
6012                                 m_copydata(clonechain, len, sizeofcpy, cp);
6013                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6014                         }
6015                         return (outchain);
6016                 } else {
6017                         /* copy the old fashion way */
6018                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6019 #ifdef SCTP_MBUF_LOGGING
6020                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6021                                 struct mbuf *mat;
6022
6023                                 mat = appendchain;
6024                                 while (mat) {
6025                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6026                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6027                                         }
6028                                         mat = SCTP_BUF_NEXT(mat);
6029                                 }
6030                         }
6031 #endif
6032                 }
6033         }
6034         if (appendchain == NULL) {
6035                 /* error */
6036                 if (outchain)
6037                         sctp_m_freem(outchain);
6038                 return (NULL);
6039         }
6040         if (outchain) {
6041                 /* tack on to the end */
6042                 if (*endofchain != NULL) {
6043                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6044                 } else {
6045                         m = outchain;
6046                         while (m) {
6047                                 if (SCTP_BUF_NEXT(m) == NULL) {
6048                                         SCTP_BUF_NEXT(m) = appendchain;
6049                                         break;
6050                                 }
6051                                 m = SCTP_BUF_NEXT(m);
6052                         }
6053                 }
6054                 /*
6055                  * save off the end and update the end-chain postion
6056                  */
6057                 m = appendchain;
6058                 while (m) {
6059                         if (SCTP_BUF_NEXT(m) == NULL) {
6060                                 *endofchain = m;
6061                                 break;
6062                         }
6063                         m = SCTP_BUF_NEXT(m);
6064                 }
6065                 return (outchain);
6066         } else {
6067                 /* save off the end and update the end-chain postion */
6068                 m = appendchain;
6069                 while (m) {
6070                         if (SCTP_BUF_NEXT(m) == NULL) {
6071                                 *endofchain = m;
6072                                 break;
6073                         }
6074                         m = SCTP_BUF_NEXT(m);
6075                 }
6076                 return (appendchain);
6077         }
6078 }
6079
6080 int
6081 sctp_med_chunk_output(struct sctp_inpcb *inp,
6082     struct sctp_tcb *stcb,
6083     struct sctp_association *asoc,
6084     int *num_out,
6085     int *reason_code,
6086     int control_only, int from_where,
6087     struct timeval *now, int *now_filled, int frag_point, int so_locked
6088 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6089     SCTP_UNUSED
6090 #endif
6091 );
6092
6093 static void
6094 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6095     uint32_t val)
6096 {
6097         struct sctp_copy_all *ca;
6098         struct mbuf *m;
6099         int ret = 0;
6100         int added_control = 0;
6101         int un_sent, do_chunk_output = 1;
6102         struct sctp_association *asoc;
6103
6104         ca = (struct sctp_copy_all *)ptr;
6105         if (ca->m == NULL) {
6106                 return;
6107         }
6108         if (ca->inp != inp) {
6109                 /* TSNH */
6110                 return;
6111         }
6112         if ((ca->m) && ca->sndlen) {
6113                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6114                 if (m == NULL) {
6115                         /* can't copy so we are done */
6116                         ca->cnt_failed++;
6117                         return;
6118                 }
6119 #ifdef SCTP_MBUF_LOGGING
6120                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6121                         struct mbuf *mat;
6122
6123                         mat = m;
6124                         while (mat) {
6125                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6126                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6127                                 }
6128                                 mat = SCTP_BUF_NEXT(mat);
6129                         }
6130                 }
6131 #endif
6132         } else {
6133                 m = NULL;
6134         }
6135         SCTP_TCB_LOCK_ASSERT(stcb);
6136         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6137                 /* Abort this assoc with m as the user defined reason */
6138                 if (m) {
6139                         struct sctp_paramhdr *ph;
6140
6141                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6142                         if (m) {
6143                                 ph = mtod(m, struct sctp_paramhdr *);
6144                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6145                                 ph->param_length = htons(ca->sndlen);
6146                         }
6147                         /*
6148                          * We add one here to keep the assoc from
6149                          * dis-appearing on us.
6150                          */
6151                         atomic_add_int(&stcb->asoc.refcnt, 1);
6152                         sctp_abort_an_association(inp, stcb,
6153                             SCTP_RESPONSE_TO_USER_REQ,
6154                             m, SCTP_SO_NOT_LOCKED);
6155                         /*
6156                          * sctp_abort_an_association calls sctp_free_asoc()
6157                          * free association will NOT free it since we
6158                          * incremented the refcnt .. we do this to prevent
6159                          * it being freed and things getting tricky since we
6160                          * could end up (from free_asoc) calling inpcb_free
6161                          * which would get a recursive lock call to the
6162                          * iterator lock.. But as a consequence of that the
6163                          * stcb will return to us un-locked.. since
6164                          * free_asoc returns with either no TCB or the TCB
6165                          * unlocked, we must relock.. to unlock in the
6166                          * iterator timer :-0
6167                          */
6168                         SCTP_TCB_LOCK(stcb);
6169                         atomic_add_int(&stcb->asoc.refcnt, -1);
6170                         goto no_chunk_output;
6171                 }
6172         } else {
6173                 if (m) {
6174                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6175                             &ca->sndrcv, 1);
6176                 }
6177                 asoc = &stcb->asoc;
6178                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6179                         /* shutdown this assoc */
6180                         int cnt;
6181
6182                         cnt = sctp_is_there_unsent_data(stcb);
6183
6184                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6185                             TAILQ_EMPTY(&asoc->sent_queue) &&
6186                             (cnt == 0)) {
6187                                 if (asoc->locked_on_sending) {
6188                                         goto abort_anyway;
6189                                 }
6190                                 /*
6191                                  * there is nothing queued to send, so I'm
6192                                  * done...
6193                                  */
6194                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6195                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6196                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6197                                         /*
6198                                          * only send SHUTDOWN the first time
6199                                          * through
6200                                          */
6201                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6202                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6203                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6204                                         }
6205                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6206                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6207                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6208                                             asoc->primary_destination);
6209                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6210                                             asoc->primary_destination);
6211                                         added_control = 1;
6212                                         do_chunk_output = 0;
6213                                 }
6214                         } else {
6215                                 /*
6216                                  * we still got (or just got) data to send,
6217                                  * so set SHUTDOWN_PENDING
6218                                  */
6219                                 /*
6220                                  * XXX sockets draft says that SCTP_EOF
6221                                  * should be sent with no data.  currently,
6222                                  * we will allow user data to be sent first
6223                                  * and move to SHUTDOWN-PENDING
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                                         if (asoc->locked_on_sending) {
6229                                                 /*
6230                                                  * Locked to send out the
6231                                                  * data
6232                                                  */
6233                                                 struct sctp_stream_queue_pending *sp;
6234
6235                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6236                                                 if (sp) {
6237                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6238                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6239                                                 }
6240                                         }
6241                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6242                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6243                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6244                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6245                                 abort_anyway:
6246                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6247                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6248                                                     SCTP_RESPONSE_TO_USER_REQ,
6249                                                     NULL, SCTP_SO_NOT_LOCKED);
6250                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6251                                                 goto no_chunk_output;
6252                                         }
6253                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6254                                             asoc->primary_destination);
6255                                 }
6256                         }
6257
6258                 }
6259         }
6260         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6261             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6262
6263         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6264             (stcb->asoc.total_flight > 0) &&
6265             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6266             ) {
6267                 do_chunk_output = 0;
6268         }
6269         if (do_chunk_output)
6270                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6271         else if (added_control) {
6272                 int num_out = 0, reason = 0, now_filled = 0;
6273                 struct timeval now;
6274                 int frag_point;
6275
6276                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6277                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6278                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6279         }
6280 no_chunk_output:
6281         if (ret) {
6282                 ca->cnt_failed++;
6283         } else {
6284                 ca->cnt_sent++;
6285         }
6286 }
6287
6288 static void
6289 sctp_sendall_completes(void *ptr, uint32_t val)
6290 {
6291         struct sctp_copy_all *ca;
6292
6293         ca = (struct sctp_copy_all *)ptr;
6294         /*
6295          * Do a notify here? Kacheong suggests that the notify be done at
6296          * the send time.. so you would push up a notification if any send
6297          * failed. Don't know if this is feasable since the only failures we
6298          * have is "memory" related and if you cannot get an mbuf to send
6299          * the data you surely can't get an mbuf to send up to notify the
6300          * user you can't send the data :->
6301          */
6302
6303         /* now free everything */
6304         sctp_m_freem(ca->m);
6305         SCTP_FREE(ca, SCTP_M_COPYAL);
6306 }
6307
6308
6309 #define MC_ALIGN(m, len) do {                                           \
6310         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6311 } while (0)
6312
6313
6314
6315 static struct mbuf *
6316 sctp_copy_out_all(struct uio *uio, int len)
6317 {
6318         struct mbuf *ret, *at;
6319         int left, willcpy, cancpy, error;
6320
6321         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6322         if (ret == NULL) {
6323                 /* TSNH */
6324                 return (NULL);
6325         }
6326         left = len;
6327         SCTP_BUF_LEN(ret) = 0;
6328         /* save space for the data chunk header */
6329         cancpy = M_TRAILINGSPACE(ret);
6330         willcpy = min(cancpy, left);
6331         at = ret;
6332         while (left > 0) {
6333                 /* Align data to the end */
6334                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6335                 if (error) {
6336         err_out_now:
6337                         sctp_m_freem(at);
6338                         return (NULL);
6339                 }
6340                 SCTP_BUF_LEN(at) = willcpy;
6341                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6342                 left -= willcpy;
6343                 if (left > 0) {
6344                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6345                         if (SCTP_BUF_NEXT(at) == NULL) {
6346                                 goto err_out_now;
6347                         }
6348                         at = SCTP_BUF_NEXT(at);
6349                         SCTP_BUF_LEN(at) = 0;
6350                         cancpy = M_TRAILINGSPACE(at);
6351                         willcpy = min(cancpy, left);
6352                 }
6353         }
6354         return (ret);
6355 }
6356
6357 static int
6358 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6359     struct sctp_sndrcvinfo *srcv)
6360 {
6361         int ret;
6362         struct sctp_copy_all *ca;
6363
6364         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6365             SCTP_M_COPYAL);
6366         if (ca == NULL) {
6367                 sctp_m_freem(m);
6368                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6369                 return (ENOMEM);
6370         }
6371         memset(ca, 0, sizeof(struct sctp_copy_all));
6372
6373         ca->inp = inp;
6374         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6375         /*
6376          * take off the sendall flag, it would be bad if we failed to do
6377          * this :-0
6378          */
6379         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6380         /* get length and mbuf chain */
6381         if (uio) {
6382                 ca->sndlen = uio->uio_resid;
6383                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6384                 if (ca->m == NULL) {
6385                         SCTP_FREE(ca, SCTP_M_COPYAL);
6386                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6387                         return (ENOMEM);
6388                 }
6389         } else {
6390                 /* Gather the length of the send */
6391                 struct mbuf *mat;
6392
6393                 mat = m;
6394                 ca->sndlen = 0;
6395                 while (m) {
6396                         ca->sndlen += SCTP_BUF_LEN(m);
6397                         m = SCTP_BUF_NEXT(m);
6398                 }
6399                 ca->m = mat;
6400         }
6401         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6402             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6403             SCTP_ASOC_ANY_STATE,
6404             (void *)ca, 0,
6405             sctp_sendall_completes, inp, 1);
6406         if (ret) {
6407                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6408                 SCTP_FREE(ca, SCTP_M_COPYAL);
6409                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6410                 return (EFAULT);
6411         }
6412         return (0);
6413 }
6414
6415
6416 void
6417 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6418 {
6419         struct sctp_tmit_chunk *chk, *nchk;
6420
6421         chk = TAILQ_FIRST(&asoc->control_send_queue);
6422         while (chk) {
6423                 nchk = TAILQ_NEXT(chk, sctp_next);
6424                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6425                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6426                         if (chk->data) {
6427                                 sctp_m_freem(chk->data);
6428                                 chk->data = NULL;
6429                         }
6430                         asoc->ctrl_queue_cnt--;
6431                         sctp_free_a_chunk(stcb, chk);
6432                 }
6433                 chk = nchk;
6434         }
6435 }
6436
6437 void
6438 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6439 {
6440         struct sctp_association *asoc;
6441         struct sctp_tmit_chunk *chk, *chk_tmp;
6442         struct sctp_asconf_chunk *acp;
6443
6444         asoc = &stcb->asoc;
6445         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6446             chk = chk_tmp) {
6447                 /* get next chk */
6448                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6449                 /* find SCTP_ASCONF chunk in queue */
6450                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6451                         if (chk->data) {
6452                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6453                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6454                                         /* Not Acked yet */
6455                                         break;
6456                                 }
6457                         }
6458                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6459                         if (chk->data) {
6460                                 sctp_m_freem(chk->data);
6461                                 chk->data = NULL;
6462                         }
6463                         asoc->ctrl_queue_cnt--;
6464                         sctp_free_a_chunk(stcb, chk);
6465                 }
6466         }
6467 }
6468
6469
6470 static void
6471 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6472
6473     struct sctp_association *asoc,
6474     struct sctp_tmit_chunk **data_list,
6475     int bundle_at,
6476     struct sctp_nets *net)
6477 {
6478         int i;
6479         struct sctp_tmit_chunk *tp1;
6480
6481         for (i = 0; i < bundle_at; i++) {
6482                 /* off of the send queue */
6483                 if (i) {
6484                         /*
6485                          * Any chunk NOT 0 you zap the time chunk 0 gets
6486                          * zapped or set based on if a RTO measurment is
6487                          * needed.
6488                          */
6489                         data_list[i]->do_rtt = 0;
6490                 }
6491                 /* record time */
6492                 data_list[i]->sent_rcv_time = net->last_sent_time;
6493                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6494                 TAILQ_REMOVE(&asoc->send_queue,
6495                     data_list[i],
6496                     sctp_next);
6497                 /* on to the sent queue */
6498                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6499                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6500                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6501                         struct sctp_tmit_chunk *tpp;
6502
6503                         /* need to move back */
6504         back_up_more:
6505                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6506                         if (tpp == NULL) {
6507                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6508                                 goto all_done;
6509                         }
6510                         tp1 = tpp;
6511                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6512                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6513                                 goto back_up_more;
6514                         }
6515                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6516                 } else {
6517                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6518                             data_list[i],
6519                             sctp_next);
6520                 }
6521 all_done:
6522                 /* This does not lower until the cum-ack passes it */
6523                 asoc->sent_queue_cnt++;
6524                 asoc->send_queue_cnt--;
6525                 if ((asoc->peers_rwnd <= 0) &&
6526                     (asoc->total_flight == 0) &&
6527                     (bundle_at == 1)) {
6528                         /* Mark the chunk as being a window probe */
6529                         SCTP_STAT_INCR(sctps_windowprobed);
6530                 }
6531 #ifdef SCTP_AUDITING_ENABLED
6532                 sctp_audit_log(0xC2, 3);
6533 #endif
6534                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6535                 data_list[i]->snd_count = 1;
6536                 data_list[i]->rec.data.chunk_was_revoked = 0;
6537                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6538                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6539                             data_list[i]->whoTo->flight_size,
6540                             data_list[i]->book_size,
6541                             (uintptr_t) data_list[i]->whoTo,
6542                             data_list[i]->rec.data.TSN_seq);
6543                 }
6544                 sctp_flight_size_increase(data_list[i]);
6545                 sctp_total_flight_increase(stcb, data_list[i]);
6546                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6547                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6548                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6549                 }
6550                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6551                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6552                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6553                         /* SWS sender side engages */
6554                         asoc->peers_rwnd = 0;
6555                 }
6556         }
6557 }
6558
6559 static void
6560 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6561 {
6562         struct sctp_tmit_chunk *chk, *nchk;
6563
6564         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6565             chk; chk = nchk) {
6566                 nchk = TAILQ_NEXT(chk, sctp_next);
6567                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6568                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6569                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6570                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6571                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6572                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6573                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6574                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6575                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6576                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6577                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6578                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6579                         /* Stray chunks must be cleaned up */
6580         clean_up_anyway:
6581                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6582                         if (chk->data) {
6583                                 sctp_m_freem(chk->data);
6584                                 chk->data = NULL;
6585                         }
6586                         asoc->ctrl_queue_cnt--;
6587                         sctp_free_a_chunk(stcb, chk);
6588                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6589                         /* special handling, we must look into the param */
6590                         if (chk != asoc->str_reset) {
6591                                 goto clean_up_anyway;
6592                         }
6593                 }
6594         }
6595 }
6596
6597
6598 static int
6599 sctp_can_we_split_this(struct sctp_tcb *stcb,
6600     uint32_t length,
6601     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6602 {
6603         /*
6604          * Make a decision on if I should split a msg into multiple parts.
6605          * This is only asked of incomplete messages.
6606          */
6607         if (eeor_on) {
6608                 /*
6609                  * If we are doing EEOR we need to always send it if its the
6610                  * entire thing, since it might be all the guy is putting in
6611                  * the hopper.
6612                  */
6613                 if (goal_mtu >= length) {
6614                         /*-
6615                          * If we have data outstanding,
6616                          * we get another chance when the sack
6617                          * arrives to transmit - wait for more data
6618                          */
6619                         if (stcb->asoc.total_flight == 0) {
6620                                 /*
6621                                  * If nothing is in flight, we zero the
6622                                  * packet counter.
6623                                  */
6624                                 return (length);
6625                         }
6626                         return (0);
6627
6628                 } else {
6629                         /* You can fill the rest */
6630                         return (goal_mtu);
6631                 }
6632         }
6633         /*-
6634          * For those strange folk that make the send buffer
6635          * smaller than our fragmentation point, we can't
6636          * get a full msg in so we have to allow splitting.
6637          */
6638         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6639                 return (length);
6640         }
6641         if ((length <= goal_mtu) ||
6642             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6643                 /* Sub-optimial residual don't split in non-eeor mode. */
6644                 return (0);
6645         }
6646         /*
6647          * If we reach here length is larger than the goal_mtu. Do we wish
6648          * to split it for the sake of packet putting together?
6649          */
6650         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6651                 /* Its ok to split it */
6652                 return (min(goal_mtu, frag_point));
6653         }
6654         /* Nope, can't split */
6655         return (0);
6656
6657 }
6658
6659 static uint32_t
6660 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6661     struct sctp_stream_out *strq,
6662     uint32_t goal_mtu,
6663     uint32_t frag_point,
6664     int *locked,
6665     int *giveup,
6666     int eeor_mode,
6667     int *bail)
6668 {
6669         /* Move from the stream to the send_queue keeping track of the total */
6670         struct sctp_association *asoc;
6671         struct sctp_stream_queue_pending *sp;
6672         struct sctp_tmit_chunk *chk;
6673         struct sctp_data_chunk *dchkh;
6674         uint32_t to_move, length;
6675         uint8_t rcv_flags = 0;
6676         uint8_t some_taken;
6677         uint8_t send_lock_up = 0;
6678
6679         SCTP_TCB_LOCK_ASSERT(stcb);
6680         asoc = &stcb->asoc;
6681 one_more_time:
6682         /* sa_ignore FREED_MEMORY */
6683         sp = TAILQ_FIRST(&strq->outqueue);
6684         if (sp == NULL) {
6685                 *locked = 0;
6686                 if (send_lock_up == 0) {
6687                         SCTP_TCB_SEND_LOCK(stcb);
6688                         send_lock_up = 1;
6689                 }
6690                 sp = TAILQ_FIRST(&strq->outqueue);
6691                 if (sp) {
6692                         goto one_more_time;
6693                 }
6694                 if (strq->last_msg_incomplete) {
6695                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6696                             strq->stream_no,
6697                             strq->last_msg_incomplete);
6698                         strq->last_msg_incomplete = 0;
6699                 }
6700                 to_move = 0;
6701                 if (send_lock_up) {
6702                         SCTP_TCB_SEND_UNLOCK(stcb);
6703                         send_lock_up = 0;
6704                 }
6705                 goto out_of;
6706         }
6707         if ((sp->msg_is_complete) && (sp->length == 0)) {
6708                 if (sp->sender_all_done) {
6709                         /*
6710                          * We are doing differed cleanup. Last time through
6711                          * when we took all the data the sender_all_done was
6712                          * not set.
6713                          */
6714                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6715                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6716                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6717                                     sp->sender_all_done,
6718                                     sp->length,
6719                                     sp->msg_is_complete,
6720                                     sp->put_last_out,
6721                                     send_lock_up);
6722                         }
6723                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6724                                 SCTP_TCB_SEND_LOCK(stcb);
6725                                 send_lock_up = 1;
6726                         }
6727                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6728                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6729                         sctp_free_remote_addr(sp->net);
6730                         if (sp->data) {
6731                                 sctp_m_freem(sp->data);
6732                                 sp->data = NULL;
6733                         }
6734                         sctp_free_a_strmoq(stcb, sp);
6735                         /* we can't be locked to it */
6736                         *locked = 0;
6737                         stcb->asoc.locked_on_sending = NULL;
6738                         if (send_lock_up) {
6739                                 SCTP_TCB_SEND_UNLOCK(stcb);
6740                                 send_lock_up = 0;
6741                         }
6742                         /* back to get the next msg */
6743                         goto one_more_time;
6744                 } else {
6745                         /*
6746                          * sender just finished this but still holds a
6747                          * reference
6748                          */
6749                         *locked = 1;
6750                         *giveup = 1;
6751                         to_move = 0;
6752                         goto out_of;
6753                 }
6754         } else {
6755                 /* is there some to get */
6756                 if (sp->length == 0) {
6757                         /* no */
6758                         *locked = 1;
6759                         *giveup = 1;
6760                         to_move = 0;
6761                         goto out_of;
6762                 } else if (sp->discard_rest) {
6763                         if (send_lock_up == 0) {
6764                                 SCTP_TCB_SEND_LOCK(stcb);
6765                                 send_lock_up = 1;
6766                         }
6767                         /* Whack down the size */
6768                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6769                         if ((stcb->sctp_socket != NULL) && \
6770                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6771                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6772                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6773                         }
6774                         if (sp->data) {
6775                                 sctp_m_freem(sp->data);
6776                                 sp->data = NULL;
6777                                 sp->tail_mbuf = NULL;
6778                         }
6779                         sp->length = 0;
6780                         sp->some_taken = 1;
6781                         *locked = 1;
6782                         *giveup = 1;
6783                         to_move = 0;
6784                         goto out_of;
6785                 }
6786         }
6787         some_taken = sp->some_taken;
6788         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6789                 sp->msg_is_complete = 1;
6790         }
6791 re_look:
6792         length = sp->length;
6793         if (sp->msg_is_complete) {
6794                 /* The message is complete */
6795                 to_move = min(length, frag_point);
6796                 if (to_move == length) {
6797                         /* All of it fits in the MTU */
6798                         if (sp->some_taken) {
6799                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6800                                 sp->put_last_out = 1;
6801                         } else {
6802                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6803                                 sp->put_last_out = 1;
6804                         }
6805                 } else {
6806                         /* Not all of it fits, we fragment */
6807                         if (sp->some_taken == 0) {
6808                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6809                         }
6810                         sp->some_taken = 1;
6811                 }
6812         } else {
6813                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6814                 if (to_move) {
6815                         /*-
6816                          * We use a snapshot of length in case it
6817                          * is expanding during the compare.
6818                          */
6819                         uint32_t llen;
6820
6821                         llen = length;
6822                         if (to_move >= llen) {
6823                                 to_move = llen;
6824                                 if (send_lock_up == 0) {
6825                                         /*-
6826                                          * We are taking all of an incomplete msg
6827                                          * thus we need a send lock.
6828                                          */
6829                                         SCTP_TCB_SEND_LOCK(stcb);
6830                                         send_lock_up = 1;
6831                                         if (sp->msg_is_complete) {
6832                                                 /*
6833                                                  * the sender finished the
6834                                                  * msg
6835                                                  */
6836                                                 goto re_look;
6837                                         }
6838                                 }
6839                         }
6840                         if (sp->some_taken == 0) {
6841                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6842                                 sp->some_taken = 1;
6843                         }
6844                 } else {
6845                         /* Nothing to take. */
6846                         if (sp->some_taken) {
6847                                 *locked = 1;
6848                         }
6849                         *giveup = 1;
6850                         to_move = 0;
6851                         goto out_of;
6852                 }
6853         }
6854
6855         /* If we reach here, we can copy out a chunk */
6856         sctp_alloc_a_chunk(stcb, chk);
6857         if (chk == NULL) {
6858                 /* No chunk memory */
6859                 *giveup = 1;
6860                 to_move = 0;
6861                 goto out_of;
6862         }
6863         /*
6864          * Setup for unordered if needed by looking at the user sent info
6865          * flags.
6866          */
6867         if (sp->sinfo_flags & SCTP_UNORDERED) {
6868                 rcv_flags |= SCTP_DATA_UNORDERED;
6869         }
6870         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6871             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6872                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6873         }
6874         /* clear out the chunk before setting up */
6875         memset(chk, 0, sizeof(*chk));
6876         chk->rec.data.rcv_flags = rcv_flags;
6877
6878         if (to_move >= length) {
6879                 /* we think we can steal the whole thing */
6880                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6881                         SCTP_TCB_SEND_LOCK(stcb);
6882                         send_lock_up = 1;
6883                 }
6884                 if (to_move < sp->length) {
6885                         /* bail, it changed */
6886                         goto dont_do_it;
6887                 }
6888                 chk->data = sp->data;
6889                 chk->last_mbuf = sp->tail_mbuf;
6890                 /* register the stealing */
6891                 sp->data = sp->tail_mbuf = NULL;
6892         } else {
6893                 struct mbuf *m;
6894
6895 dont_do_it:
6896                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6897                 chk->last_mbuf = NULL;
6898                 if (chk->data == NULL) {
6899                         sp->some_taken = some_taken;
6900                         sctp_free_a_chunk(stcb, chk);
6901                         *bail = 1;
6902                         to_move = 0;
6903                         goto out_of;
6904                 }
6905 #ifdef SCTP_MBUF_LOGGING
6906                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6907                         struct mbuf *mat;
6908
6909                         mat = chk->data;
6910                         while (mat) {
6911                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6912                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6913                                 }
6914                                 mat = SCTP_BUF_NEXT(mat);
6915                         }
6916                 }
6917 #endif
6918                 /* Pull off the data */
6919                 m_adj(sp->data, to_move);
6920                 /* Now lets work our way down and compact it */
6921                 m = sp->data;
6922                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6923                         sp->data = SCTP_BUF_NEXT(m);
6924                         SCTP_BUF_NEXT(m) = NULL;
6925                         if (sp->tail_mbuf == m) {
6926                                 /*-
6927                                  * Freeing tail? TSNH since
6928                                  * we supposedly were taking less
6929                                  * than the sp->length.
6930                                  */
6931 #ifdef INVARIANTS
6932                                 panic("Huh, freing tail? - TSNH");
6933 #else
6934                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6935                                 sp->tail_mbuf = sp->data = NULL;
6936                                 sp->length = 0;
6937 #endif
6938
6939                         }
6940                         sctp_m_free(m);
6941                         m = sp->data;
6942                 }
6943         }
6944         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6945                 chk->copy_by_ref = 1;
6946         } else {
6947                 chk->copy_by_ref = 0;
6948         }
6949         /*
6950          * get last_mbuf and counts of mb useage This is ugly but hopefully
6951          * its only one mbuf.
6952          */
6953         if (chk->last_mbuf == NULL) {
6954                 chk->last_mbuf = chk->data;
6955                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6956                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6957                 }
6958         }
6959         if (to_move > length) {
6960                 /*- This should not happen either
6961                  * since we always lower to_move to the size
6962                  * of sp->length if its larger.
6963                  */
6964 #ifdef INVARIANTS
6965                 panic("Huh, how can to_move be larger?");
6966 #else
6967                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6968                 sp->length = 0;
6969 #endif
6970         } else {
6971                 atomic_subtract_int(&sp->length, to_move);
6972         }
6973         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6974                 /* Not enough room for a chunk header, get some */
6975                 struct mbuf *m;
6976
6977                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6978                 if (m == NULL) {
6979                         /*
6980                          * we're in trouble here. _PREPEND below will free
6981                          * all the data if there is no leading space, so we
6982                          * must put the data back and restore.
6983                          */
6984                         if (send_lock_up == 0) {
6985                                 SCTP_TCB_SEND_LOCK(stcb);
6986                                 send_lock_up = 1;
6987                         }
6988                         if (chk->data == NULL) {
6989                                 /* unsteal the data */
6990                                 sp->data = chk->data;
6991                                 sp->tail_mbuf = chk->last_mbuf;
6992                         } else {
6993                                 struct mbuf *m_tmp;
6994
6995                                 /* reassemble the data */
6996                                 m_tmp = sp->data;
6997                                 sp->data = chk->data;
6998                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6999                         }
7000                         sp->some_taken = some_taken;
7001                         atomic_add_int(&sp->length, to_move);
7002                         chk->data = NULL;
7003                         *bail = 1;
7004                         sctp_free_a_chunk(stcb, chk);
7005                         to_move = 0;
7006                         goto out_of;
7007                 } else {
7008                         SCTP_BUF_LEN(m) = 0;
7009                         SCTP_BUF_NEXT(m) = chk->data;
7010                         chk->data = m;
7011                         M_ALIGN(chk->data, 4);
7012                 }
7013         }
7014         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7015         if (chk->data == NULL) {
7016                 /* HELP, TSNH since we assured it would not above? */
7017 #ifdef INVARIANTS
7018                 panic("prepend failes HELP?");
7019 #else
7020                 SCTP_PRINTF("prepend fails HELP?\n");
7021                 sctp_free_a_chunk(stcb, chk);
7022 #endif
7023                 *bail = 1;
7024                 to_move = 0;
7025                 goto out_of;
7026         }
7027         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7028         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7029         chk->book_size_scale = 0;
7030         chk->sent = SCTP_DATAGRAM_UNSENT;
7031
7032         chk->flags = 0;
7033         chk->asoc = &stcb->asoc;
7034         chk->pad_inplace = 0;
7035         chk->no_fr_allowed = 0;
7036         chk->rec.data.stream_seq = sp->strseq;
7037         chk->rec.data.stream_number = sp->stream;
7038         chk->rec.data.payloadtype = sp->ppid;
7039         chk->rec.data.context = sp->context;
7040         chk->rec.data.doing_fast_retransmit = 0;
7041         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
7042
7043         chk->rec.data.timetodrop = sp->ts;
7044         chk->flags = sp->act_flags;
7045
7046         chk->whoTo = net;
7047         atomic_add_int(&chk->whoTo->ref_count, 1);
7048
7049         if (sp->holds_key_ref) {
7050                 chk->auth_keyid = sp->auth_keyid;
7051                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7052                 chk->holds_key_ref = 1;
7053         }
7054         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7055         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7056                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7057                     (uintptr_t) stcb, sp->length,
7058                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7059                     chk->rec.data.TSN_seq);
7060         }
7061         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7062         /*
7063          * Put the rest of the things in place now. Size was done earlier in
7064          * previous loop prior to padding.
7065          */
7066
7067 #ifdef SCTP_ASOCLOG_OF_TSNS
7068         SCTP_TCB_LOCK_ASSERT(stcb);
7069         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7070                 asoc->tsn_out_at = 0;
7071                 asoc->tsn_out_wrapped = 1;
7072         }
7073         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7074         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7075         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7076         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7077         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7078         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7079         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7080         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7081         asoc->tsn_out_at++;
7082 #endif
7083
7084         dchkh->ch.chunk_type = SCTP_DATA;
7085         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7086         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7087         dchkh->dp.stream_id = htons(strq->stream_no);
7088         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7089         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7090         dchkh->ch.chunk_length = htons(chk->send_size);
7091         /* Now advance the chk->send_size by the actual pad needed. */
7092         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7093                 /* need a pad */
7094                 struct mbuf *lm;
7095                 int pads;
7096
7097                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7098                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7099                         chk->pad_inplace = 1;
7100                 }
7101                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7102                         /* pad added an mbuf */
7103                         chk->last_mbuf = lm;
7104                 }
7105                 chk->send_size += pads;
7106         }
7107         /* We only re-set the policy if it is on */
7108         if (sp->pr_sctp_on) {
7109                 sctp_set_prsctp_policy(sp);
7110                 asoc->pr_sctp_cnt++;
7111                 chk->pr_sctp_on = 1;
7112         } else {
7113                 chk->pr_sctp_on = 0;
7114         }
7115         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7116                 /* All done pull and kill the message */
7117                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7118                 if (sp->put_last_out == 0) {
7119                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7120                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7121                             sp->sender_all_done,
7122                             sp->length,
7123                             sp->msg_is_complete,
7124                             sp->put_last_out,
7125                             send_lock_up);
7126                 }
7127                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7128                         SCTP_TCB_SEND_LOCK(stcb);
7129                         send_lock_up = 1;
7130                 }
7131                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7132                 sctp_free_remote_addr(sp->net);
7133                 if (sp->data) {
7134                         sctp_m_freem(sp->data);
7135                         sp->data = NULL;
7136                 }
7137                 sctp_free_a_strmoq(stcb, sp);
7138
7139                 /* we can't be locked to it */
7140                 *locked = 0;
7141                 stcb->asoc.locked_on_sending = NULL;
7142         } else {
7143                 /* more to go, we are locked */
7144                 *locked = 1;
7145         }
7146         asoc->chunks_on_out_queue++;
7147         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7148         asoc->send_queue_cnt++;
7149 out_of:
7150         if (send_lock_up) {
7151                 SCTP_TCB_SEND_UNLOCK(stcb);
7152                 send_lock_up = 0;
7153         }
7154         return (to_move);
7155 }
7156
7157
7158 static struct sctp_stream_out *
7159 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7160 {
7161         struct sctp_stream_out *strq;
7162
7163         /* Find the next stream to use */
7164         if (asoc->last_out_stream == NULL) {
7165                 strq = TAILQ_FIRST(&asoc->out_wheel);
7166         } else {
7167                 strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7168                 if (strq == NULL) {
7169                         strq = TAILQ_FIRST(&asoc->out_wheel);
7170                 }
7171         }
7172         return (strq);
7173 }
7174
7175
7176 static void
7177 sctp_fill_outqueue(struct sctp_tcb *stcb,
7178     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7179 {
7180         struct sctp_association *asoc;
7181         struct sctp_stream_out *strq, *strqn;
7182         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7183         int locked, giveup;
7184         struct sctp_stream_queue_pending *sp;
7185
7186         SCTP_TCB_LOCK_ASSERT(stcb);
7187         asoc = &stcb->asoc;
7188 #ifdef INET6
7189         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7190                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7191         } else {
7192                 /* ?? not sure what else to do */
7193                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7194         }
7195 #else
7196         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7197 #endif
7198         /* Need an allowance for the data chunk header too */
7199         goal_mtu -= sizeof(struct sctp_data_chunk);
7200
7201         /* must make even word boundary */
7202         goal_mtu &= 0xfffffffc;
7203         if (asoc->locked_on_sending) {
7204                 /* We are stuck on one stream until the message completes. */
7205                 strqn = strq = asoc->locked_on_sending;
7206                 locked = 1;
7207         } else {
7208                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7209                 locked = 0;
7210         }
7211
7212         while ((goal_mtu > 0) && strq) {
7213                 sp = TAILQ_FIRST(&strq->outqueue);
7214                 /*
7215                  * If CMT is off, we must validate that the stream in
7216                  * question has the first item pointed towards are network
7217                  * destionation requested by the caller. Note that if we
7218                  * turn out to be locked to a stream (assigning TSN's then
7219                  * we must stop, since we cannot look for another stream
7220                  * with data to send to that destination). In CMT's case, by
7221                  * skipping this check, we will send one data packet towards
7222                  * the requested net.
7223                  */
7224                 if (sp == NULL) {
7225                         break;
7226                 }
7227                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7228                         /* none for this network */
7229                         if (locked) {
7230                                 break;
7231                         } else {
7232                                 strq = sctp_select_a_stream(stcb, asoc);
7233                                 if (strq == NULL)
7234                                         /* none left */
7235                                         break;
7236                                 if (strqn == strq) {
7237                                         /* I have circled */
7238                                         break;
7239                                 }
7240                                 continue;
7241                         }
7242                 }
7243                 giveup = 0;
7244                 bail = 0;
7245                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7246                     &giveup, eeor_mode, &bail);
7247                 if (moved_how_much)
7248                         asoc->last_out_stream = strq;
7249
7250                 if (locked) {
7251                         asoc->locked_on_sending = strq;
7252                         if ((moved_how_much == 0) || (giveup) || bail)
7253                                 /* no more to move for now */
7254                                 break;
7255                 } else {
7256                         asoc->locked_on_sending = NULL;
7257                         if (TAILQ_EMPTY(&strq->outqueue)) {
7258                                 if (strq == strqn) {
7259                                         /* Must move start to next one */
7260                                         strqn = TAILQ_NEXT(strq, next_spoke);
7261                                         if (strqn == NULL) {
7262                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7263                                                 if (strqn == NULL) {
7264                                                         break;
7265                                                 }
7266                                         }
7267                                 }
7268                                 sctp_remove_from_wheel(stcb, asoc, strq, 0);
7269                         }
7270                         if ((giveup) || bail) {
7271                                 break;
7272                         }
7273                         strq = sctp_select_a_stream(stcb, asoc);
7274                         if (strq == NULL) {
7275                                 break;
7276                         }
7277                 }
7278                 total_moved += moved_how_much;
7279                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7280                 goal_mtu &= 0xfffffffc;
7281         }
7282         if (bail)
7283                 *quit_now = 1;
7284
7285         if (total_moved == 0) {
7286                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7287                     (net == stcb->asoc.primary_destination)) {
7288                         /* ran dry for primary network net */
7289                         SCTP_STAT_INCR(sctps_primary_randry);
7290                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7291                         /* ran dry with CMT on */
7292                         SCTP_STAT_INCR(sctps_cmt_randry);
7293                 }
7294         }
7295 }
7296
7297 void
7298 sctp_fix_ecn_echo(struct sctp_association *asoc)
7299 {
7300         struct sctp_tmit_chunk *chk;
7301
7302         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7303                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7304                         chk->sent = SCTP_DATAGRAM_UNSENT;
7305                 }
7306         }
7307 }
7308
7309 static void
7310 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7311     struct sctp_association *asoc,
7312     struct sctp_nets *net)
7313 {
7314         struct sctp_tmit_chunk *chk;
7315         struct sctp_nets *a_net;
7316
7317         SCTP_TCB_LOCK_ASSERT(stcb);
7318         /*
7319          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7320          * destination using the PF algorithm for finding alternate
7321          * destinations.
7322          */
7323         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7324                 a_net = sctp_find_alternate_net(stcb, net, 2);
7325         } else {
7326                 a_net = sctp_find_alternate_net(stcb, net, 0);
7327         }
7328         if ((a_net != net) &&
7329             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7330                 /*
7331                  * We only proceed if a valid alternate is found that is not
7332                  * this one and is reachable. Here we must move all chunks
7333                  * queued in the send queue off of the destination address
7334                  * to our alternate.
7335                  */
7336                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7337                         if (chk->whoTo == net) {
7338                                 /* Move the chunk to our alternate */
7339                                 sctp_free_remote_addr(chk->whoTo);
7340                                 chk->whoTo = a_net;
7341                                 atomic_add_int(&a_net->ref_count, 1);
7342                         }
7343                 }
7344         }
7345 }
7346
7347 int
7348 sctp_med_chunk_output(struct sctp_inpcb *inp,
7349     struct sctp_tcb *stcb,
7350     struct sctp_association *asoc,
7351     int *num_out,
7352     int *reason_code,
7353     int control_only, int from_where,
7354     struct timeval *now, int *now_filled, int frag_point, int so_locked
7355 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7356     SCTP_UNUSED
7357 #endif
7358 )
7359 {
7360         /*
7361          * Ok this is the generic chunk service queue. we must do the
7362          * following: - Service the stream queue that is next, moving any
7363          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7364          * LAST to the out queue in one pass) and assigning TSN's - Check to
7365          * see if the cwnd/rwnd allows any output, if so we go ahead and
7366          * fomulate and send the low level chunks. Making sure to combine
7367          * any control in the control chunk queue also.
7368          */
7369         struct sctp_nets *net, *start_at, *old_start_at = NULL;
7370         struct mbuf *outchain, *endoutchain;
7371         struct sctp_tmit_chunk *chk, *nchk;
7372
7373         /* temp arrays for unlinking */
7374         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7375         int no_fragmentflg, error;
7376         unsigned int max_rwnd_per_dest;
7377         int one_chunk, hbflag, skip_data_for_this_net;
7378         int asconf, cookie, no_out_cnt;
7379         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7380         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7381         int tsns_sent = 0;
7382         uint32_t auth_offset = 0;
7383         struct sctp_auth_chunk *auth = NULL;
7384         uint16_t auth_keyid;
7385         int override_ok = 1;
7386         int data_auth_reqd = 0;
7387
7388         /*
7389          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7390          * destination.
7391          */
7392         int pf_hbflag = 0;
7393         int quit_now = 0;
7394
7395         *num_out = 0;
7396         auth_keyid = stcb->asoc.authinfo.active_keyid;
7397
7398         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7399             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7400             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7401                 eeor_mode = 1;
7402         } else {
7403                 eeor_mode = 0;
7404         }
7405         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7406         /*
7407          * First lets prime the pump. For each destination, if there is room
7408          * in the flight size, attempt to pull an MTU's worth out of the
7409          * stream queues into the general send_queue
7410          */
7411 #ifdef SCTP_AUDITING_ENABLED
7412         sctp_audit_log(0xC2, 2);
7413 #endif
7414         SCTP_TCB_LOCK_ASSERT(stcb);
7415         hbflag = 0;
7416         if ((control_only) || (asoc->stream_reset_outstanding))
7417                 no_data_chunks = 1;
7418         else
7419                 no_data_chunks = 0;
7420
7421         /* Nothing to possible to send? */
7422         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7423             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7424             TAILQ_EMPTY(&asoc->send_queue) &&
7425             TAILQ_EMPTY(&asoc->out_wheel)) {
7426                 *reason_code = 9;
7427                 return (0);
7428         }
7429         if (asoc->peers_rwnd == 0) {
7430                 /* No room in peers rwnd */
7431                 *reason_code = 1;
7432                 if (asoc->total_flight > 0) {
7433                         /* we are allowed one chunk in flight */
7434                         no_data_chunks = 1;
7435                 }
7436         }
7437         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7438         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7439                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7440                         /*
7441                          * This for loop we are in takes in each net, if
7442                          * its's got space in cwnd and has data sent to it
7443                          * (when CMT is off) then it calls
7444                          * sctp_fill_outqueue for the net. This gets data on
7445                          * the send queue for that network.
7446                          *
7447                          * In sctp_fill_outqueue TSN's are assigned and data is
7448                          * copied out of the stream buffers. Note mostly
7449                          * copy by reference (we hope).
7450                          */
7451                         net->window_probe = 0;
7452                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7453                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7454                                         sctp_log_cwnd(stcb, net, 1,
7455                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7456                                 }
7457                                 continue;
7458                         }
7459                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7460                                 /* nothing can be in queue for this guy */
7461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7462                                         sctp_log_cwnd(stcb, net, 2,
7463                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7464                                 }
7465                                 continue;
7466                         }
7467                         if (net->flight_size >= net->cwnd) {
7468                                 /* skip this network, no room - can't fill */
7469                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7470                                         sctp_log_cwnd(stcb, net, 3,
7471                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7472                                 }
7473                                 continue;
7474                         }
7475                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7476                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7477                         }
7478                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7479                         if (quit_now) {
7480                                 /* memory alloc failure */
7481                                 no_data_chunks = 1;
7482                                 break;
7483                         }
7484                 }
7485         }
7486         /* now service each destination and send out what we can for it */
7487         /* Nothing to send? */
7488         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7489             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7490             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7491                 *reason_code = 8;
7492                 return (0);
7493         }
7494         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7495                 /* get the last start point */
7496                 start_at = asoc->last_net_cmt_send_started;
7497                 if (start_at == NULL) {
7498                         /* null so to beginning */
7499                         start_at = TAILQ_FIRST(&asoc->nets);
7500                 } else {
7501                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7502                         if (start_at == NULL) {
7503                                 start_at = TAILQ_FIRST(&asoc->nets);
7504                         }
7505                 }
7506                 asoc->last_net_cmt_send_started = start_at;
7507         } else {
7508                 start_at = TAILQ_FIRST(&asoc->nets);
7509         }
7510         old_start_at = NULL;
7511 again_one_more_time:
7512         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7513                 /* how much can we send? */
7514                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7515                 if (old_start_at && (old_start_at == net)) {
7516                         /* through list ocmpletely. */
7517                         break;
7518                 }
7519                 tsns_sent = 0xa;
7520                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7521                         /*
7522                          * Ref-count of 1 so we cannot have data or control
7523                          * queued to this address. Skip it (non-CMT).
7524                          */
7525                         continue;
7526                 }
7527                 if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7528                     (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7529                     (net->flight_size >= net->cwnd)) {
7530                         /*
7531                          * Nothing on control or asconf and flight is full,
7532                          * we can skip even in the CMT case.
7533                          */
7534                         continue;
7535                 }
7536                 ctl_cnt = bundle_at = 0;
7537                 endoutchain = outchain = NULL;
7538                 no_fragmentflg = 1;
7539                 one_chunk = 0;
7540                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7541                         skip_data_for_this_net = 1;
7542                 } else {
7543                         skip_data_for_this_net = 0;
7544                 }
7545                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7546                         /*
7547                          * if we have a route and an ifp check to see if we
7548                          * have room to send to this guy
7549                          */
7550                         struct ifnet *ifp;
7551
7552                         ifp = net->ro.ro_rt->rt_ifp;
7553                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7554                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7555                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7556                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7557                                 }
7558                                 continue;
7559                         }
7560                 }
7561                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7562                 case AF_INET:
7563                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7564                         break;
7565 #ifdef INET6
7566                 case AF_INET6:
7567                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7568                         break;
7569 #endif
7570                 default:
7571                         /* TSNH */
7572                         mtu = net->mtu;
7573                         break;
7574                 }
7575                 mx_mtu = mtu;
7576                 to_out = 0;
7577                 if (mtu > asoc->peers_rwnd) {
7578                         if (asoc->total_flight > 0) {
7579                                 /* We have a packet in flight somewhere */
7580                                 r_mtu = asoc->peers_rwnd;
7581                         } else {
7582                                 /* We are always allowed to send one MTU out */
7583                                 one_chunk = 1;
7584                                 r_mtu = mtu;
7585                         }
7586                 } else {
7587                         r_mtu = mtu;
7588                 }
7589                 /************************/
7590                 /* ASCONF transmission */
7591                 /************************/
7592                 /* Now first lets go through the asconf queue */
7593                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7594                     chk; chk = nchk) {
7595                         nchk = TAILQ_NEXT(chk, sctp_next);
7596                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7597                                 continue;
7598                         }
7599                         if (chk->whoTo != net) {
7600                                 /*
7601                                  * No, not sent to the network we are
7602                                  * looking at
7603                                  */
7604                                 break;
7605                         }
7606                         if (chk->data == NULL) {
7607                                 break;
7608                         }
7609                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7610                             chk->sent != SCTP_DATAGRAM_RESEND) {
7611                                 break;
7612                         }
7613                         /*
7614                          * if no AUTH is yet included and this chunk
7615                          * requires it, make sure to account for it.  We
7616                          * don't apply the size until the AUTH chunk is
7617                          * actually added below in case there is no room for
7618                          * this chunk. NOTE: we overload the use of "omtu"
7619                          * here
7620                          */
7621                         if ((auth == NULL) &&
7622                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7623                             stcb->asoc.peer_auth_chunks)) {
7624                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7625                         } else
7626                                 omtu = 0;
7627                         /* Here we do NOT factor the r_mtu */
7628                         if ((chk->send_size < (int)(mtu - omtu)) ||
7629                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7630                                 /*
7631                                  * We probably should glom the mbuf chain
7632                                  * from the chk->data for control but the
7633                                  * problem is it becomes yet one more level
7634                                  * of tracking to do if for some reason
7635                                  * output fails. Then I have got to
7636                                  * reconstruct the merged control chain.. el
7637                                  * yucko.. for now we take the easy way and
7638                                  * do the copy
7639                                  */
7640                                 /*
7641                                  * Add an AUTH chunk, if chunk requires it
7642                                  * save the offset into the chain for AUTH
7643                                  */
7644                                 if ((auth == NULL) &&
7645                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7646                                     stcb->asoc.peer_auth_chunks))) {
7647                                         outchain = sctp_add_auth_chunk(outchain,
7648                                             &endoutchain,
7649                                             &auth,
7650                                             &auth_offset,
7651                                             stcb,
7652                                             chk->rec.chunk_id.id);
7653                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7654                                 }
7655                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7656                                     (int)chk->rec.chunk_id.can_take_data,
7657                                     chk->send_size, chk->copy_by_ref);
7658                                 if (outchain == NULL) {
7659                                         *reason_code = 8;
7660                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7661                                         return (ENOMEM);
7662                                 }
7663                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7664                                 /* update our MTU size */
7665                                 if (mtu > (chk->send_size + omtu))
7666                                         mtu -= (chk->send_size + omtu);
7667                                 else
7668                                         mtu = 0;
7669                                 to_out += (chk->send_size + omtu);
7670                                 /* Do clear IP_DF ? */
7671                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7672                                         no_fragmentflg = 0;
7673                                 }
7674                                 if (chk->rec.chunk_id.can_take_data)
7675                                         chk->data = NULL;
7676                                 /*
7677                                  * set hb flag since we can use these for
7678                                  * RTO
7679                                  */
7680                                 hbflag = 1;
7681                                 asconf = 1;
7682                                 /*
7683                                  * should sysctl this: don't bundle data
7684                                  * with ASCONF since it requires AUTH
7685                                  */
7686                                 no_data_chunks = 1;
7687                                 chk->sent = SCTP_DATAGRAM_SENT;
7688                                 chk->snd_count++;
7689                                 if (mtu == 0) {
7690                                         /*
7691                                          * Ok we are out of room but we can
7692                                          * output without effecting the
7693                                          * flight size since this little guy
7694                                          * is a control only packet.
7695                                          */
7696                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7697                                         /*
7698                                          * do NOT clear the asconf flag as
7699                                          * it is used to do appropriate
7700                                          * source address selection.
7701                                          */
7702                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7703                                             (struct sockaddr *)&net->ro._l_addr,
7704                                             outchain, auth_offset, auth,
7705                                             stcb->asoc.authinfo.active_keyid,
7706                                             no_fragmentflg, 0, NULL, asconf,
7707                                             inp->sctp_lport, stcb->rport,
7708                                             htonl(stcb->asoc.peer_vtag),
7709                                             net->port, so_locked, NULL))) {
7710                                                 if (error == ENOBUFS) {
7711                                                         asoc->ifp_had_enobuf = 1;
7712                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7713                                                 }
7714                                                 if (from_where == 0) {
7715                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7716                                                 }
7717                                                 if (*now_filled == 0) {
7718                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7719                                                         *now_filled = 1;
7720                                                         *now = net->last_sent_time;
7721                                                 } else {
7722                                                         net->last_sent_time = *now;
7723                                                 }
7724                                                 hbflag = 0;
7725                                                 /* error, could not output */
7726                                                 if (error == EHOSTUNREACH) {
7727                                                         /*
7728                                                          * Destination went
7729                                                          * unreachable
7730                                                          * during this send
7731                                                          */
7732                                                         sctp_move_to_an_alt(stcb, asoc, net);
7733                                                 }
7734                                                 *reason_code = 7;
7735                                                 continue;
7736                                         } else
7737                                                 asoc->ifp_had_enobuf = 0;
7738                                         if (*now_filled == 0) {
7739                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7740                                                 *now_filled = 1;
7741                                                 *now = net->last_sent_time;
7742                                         } else {
7743                                                 net->last_sent_time = *now;
7744                                         }
7745                                         hbflag = 0;
7746                                         /*
7747                                          * increase the number we sent, if a
7748                                          * cookie is sent we don't tell them
7749                                          * any was sent out.
7750                                          */
7751                                         outchain = endoutchain = NULL;
7752                                         auth = NULL;
7753                                         auth_offset = 0;
7754                                         if (!no_out_cnt)
7755                                                 *num_out += ctl_cnt;
7756                                         /* recalc a clean slate and setup */
7757                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7758                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7759                                         } else {
7760                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7761                                         }
7762                                         to_out = 0;
7763                                         no_fragmentflg = 1;
7764                                 }
7765                         }
7766                 }
7767                 /************************/
7768                 /* Control transmission */
7769                 /************************/
7770                 /* Now first lets go through the control queue */
7771                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7772                     chk; chk = nchk) {
7773                         nchk = TAILQ_NEXT(chk, sctp_next);
7774                         if (chk->whoTo != net) {
7775                                 /*
7776                                  * No, not sent to the network we are
7777                                  * looking at
7778                                  */
7779                                 continue;
7780                         }
7781                         if (chk->data == NULL) {
7782                                 continue;
7783                         }
7784                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7785                                 /*
7786                                  * It must be unsent. Cookies and ASCONF's
7787                                  * hang around but there timers will force
7788                                  * when marked for resend.
7789                                  */
7790                                 continue;
7791                         }
7792                         /*
7793                          * if no AUTH is yet included and this chunk
7794                          * requires it, make sure to account for it.  We
7795                          * don't apply the size until the AUTH chunk is
7796                          * actually added below in case there is no room for
7797                          * this chunk. NOTE: we overload the use of "omtu"
7798                          * here
7799                          */
7800                         if ((auth == NULL) &&
7801                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7802                             stcb->asoc.peer_auth_chunks)) {
7803                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7804                         } else
7805                                 omtu = 0;
7806                         /* Here we do NOT factor the r_mtu */
7807                         if ((chk->send_size < (int)(mtu - omtu)) ||
7808                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7809                                 /*
7810                                  * We probably should glom the mbuf chain
7811                                  * from the chk->data for control but the
7812                                  * problem is it becomes yet one more level
7813                                  * of tracking to do if for some reason
7814                                  * output fails. Then I have got to
7815                                  * reconstruct the merged control chain.. el
7816                                  * yucko.. for now we take the easy way and
7817                                  * do the copy
7818                                  */
7819                                 /*
7820                                  * Add an AUTH chunk, if chunk requires it
7821                                  * save the offset into the chain for AUTH
7822                                  */
7823                                 if ((auth == NULL) &&
7824                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7825                                     stcb->asoc.peer_auth_chunks))) {
7826                                         outchain = sctp_add_auth_chunk(outchain,
7827                                             &endoutchain,
7828                                             &auth,
7829                                             &auth_offset,
7830                                             stcb,
7831                                             chk->rec.chunk_id.id);
7832                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7833                                 }
7834                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7835                                     (int)chk->rec.chunk_id.can_take_data,
7836                                     chk->send_size, chk->copy_by_ref);
7837                                 if (outchain == NULL) {
7838                                         *reason_code = 8;
7839                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7840                                         return (ENOMEM);
7841                                 }
7842                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7843                                 /* update our MTU size */
7844                                 if (mtu > (chk->send_size + omtu))
7845                                         mtu -= (chk->send_size + omtu);
7846                                 else
7847                                         mtu = 0;
7848                                 to_out += (chk->send_size + omtu);
7849                                 /* Do clear IP_DF ? */
7850                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7851                                         no_fragmentflg = 0;
7852                                 }
7853                                 if (chk->rec.chunk_id.can_take_data)
7854                                         chk->data = NULL;
7855                                 /* Mark things to be removed, if needed */
7856                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7857                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7858                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7859                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7860                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7861                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7862                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7863                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7864                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7865                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7866                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7867
7868                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7869                                                 hbflag = 1;
7870                                                 /*
7871                                                  * JRS 5/14/07 - Set the
7872                                                  * flag to say a heartbeat
7873                                                  * is being sent.
7874                                                  */
7875                                                 pf_hbflag = 1;
7876                                         }
7877                                         /* remove these chunks at the end */
7878                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7879                                                 /* turn off the timer */
7880                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7881                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7882                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7883                                                 }
7884                                         }
7885                                         /*
7886                                          * EY -Nr-sack version of the above
7887                                          * if statement
7888                                          */
7889                                         if ((SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) &&
7890                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {  /* EY !?! */
7891                                                 /* turn off the timer */
7892                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7893                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7894                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7895                                                 }
7896                                         }
7897                                         ctl_cnt++;
7898                                 } else {
7899                                         /*
7900                                          * Other chunks, since they have
7901                                          * timers running (i.e. COOKIE) we
7902                                          * just "trust" that it gets sent or
7903                                          * retransmitted.
7904                                          */
7905                                         ctl_cnt++;
7906                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7907                                                 cookie = 1;
7908                                                 no_out_cnt = 1;
7909                                         }
7910                                         chk->sent = SCTP_DATAGRAM_SENT;
7911                                         chk->snd_count++;
7912                                 }
7913                                 if (mtu == 0) {
7914                                         /*
7915                                          * Ok we are out of room but we can
7916                                          * output without effecting the
7917                                          * flight size since this little guy
7918                                          * is a control only packet.
7919                                          */
7920                                         if (asconf) {
7921                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7922                                                 /*
7923                                                  * do NOT clear the asconf
7924                                                  * flag as it is used to do
7925                                                  * appropriate source
7926                                                  * address selection.
7927                                                  */
7928                                         }
7929                                         if (cookie) {
7930                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7931                                                 cookie = 0;
7932                                         }
7933                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7934                                             (struct sockaddr *)&net->ro._l_addr,
7935                                             outchain,
7936                                             auth_offset, auth,
7937                                             stcb->asoc.authinfo.active_keyid,
7938                                             no_fragmentflg, 0, NULL, asconf,
7939                                             inp->sctp_lport, stcb->rport,
7940                                             htonl(stcb->asoc.peer_vtag),
7941                                             net->port, so_locked, NULL))) {
7942                                                 if (error == ENOBUFS) {
7943                                                         asoc->ifp_had_enobuf = 1;
7944                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7945                                                 }
7946                                                 if (from_where == 0) {
7947                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7948                                                 }
7949                                                 /* error, could not output */
7950                                                 if (hbflag) {
7951                                                         if (*now_filled == 0) {
7952                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7953                                                                 *now_filled = 1;
7954                                                                 *now = net->last_sent_time;
7955                                                         } else {
7956                                                                 net->last_sent_time = *now;
7957                                                         }
7958                                                         hbflag = 0;
7959                                                 }
7960                                                 if (error == EHOSTUNREACH) {
7961                                                         /*
7962                                                          * Destination went
7963                                                          * unreachable
7964                                                          * during this send
7965                                                          */
7966                                                         sctp_move_to_an_alt(stcb, asoc, net);
7967                                                 }
7968                                                 *reason_code = 7;
7969                                                 continue;
7970                                         } else
7971                                                 asoc->ifp_had_enobuf = 0;
7972                                         /* Only HB or ASCONF advances time */
7973                                         if (hbflag) {
7974                                                 if (*now_filled == 0) {
7975                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7976                                                         *now_filled = 1;
7977                                                         *now = net->last_sent_time;
7978                                                 } else {
7979                                                         net->last_sent_time = *now;
7980                                                 }
7981                                                 hbflag = 0;
7982                                         }
7983                                         /*
7984                                          * increase the number we sent, if a
7985                                          * cookie is sent we don't tell them
7986                                          * any was sent out.
7987                                          */
7988                                         outchain = endoutchain = NULL;
7989                                         auth = NULL;
7990                                         auth_offset = 0;
7991                                         if (!no_out_cnt)
7992                                                 *num_out += ctl_cnt;
7993                                         /* recalc a clean slate and setup */
7994                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7995                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7996                                         } else {
7997                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7998                                         }
7999                                         to_out = 0;
8000                                         no_fragmentflg = 1;
8001                                 }
8002                         }
8003                 }
8004                 /* JRI: if dest is in PF state, do not send data to it */
8005                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8006                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8007                     (net->dest_state & SCTP_ADDR_PF)) {
8008                         goto no_data_fill;
8009                 }
8010                 if (net->flight_size >= net->cwnd) {
8011                         goto no_data_fill;
8012                 }
8013                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) &&
8014                     (net->flight_size > max_rwnd_per_dest)) {
8015                         goto no_data_fill;
8016                 }
8017                 /*********************/
8018                 /* Data transmission */
8019                 /*********************/
8020                 /*
8021                  * if AUTH for DATA is required and no AUTH has been added
8022                  * yet, account for this in the mtu now... if no data can be
8023                  * bundled, this adjustment won't matter anyways since the
8024                  * packet will be going out...
8025                  */
8026                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8027                     stcb->asoc.peer_auth_chunks);
8028                 if (data_auth_reqd && (auth == NULL)) {
8029                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8030                 }
8031                 /* now lets add any data within the MTU constraints */
8032                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8033                 case AF_INET:
8034                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8035                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8036                         else
8037                                 omtu = 0;
8038                         break;
8039 #ifdef INET6
8040                 case AF_INET6:
8041                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8042                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8043                         else
8044                                 omtu = 0;
8045                         break;
8046 #endif
8047                 default:
8048                         /* TSNH */
8049                         omtu = 0;
8050                         break;
8051                 }
8052                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8053                     (skip_data_for_this_net == 0)) ||
8054                     (cookie)) {
8055                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8056                                 if (no_data_chunks) {
8057                                         /* let only control go out */
8058                                         *reason_code = 1;
8059                                         break;
8060                                 }
8061                                 if (net->flight_size >= net->cwnd) {
8062                                         /* skip this net, no room for data */
8063                                         *reason_code = 2;
8064                                         break;
8065                                 }
8066                                 nchk = TAILQ_NEXT(chk, sctp_next);
8067                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
8068                                         if (chk->whoTo != net) {
8069                                                 /*
8070                                                  * For CMT, steal the data
8071                                                  * to this network if its
8072                                                  * not set here.
8073                                                  */
8074                                                 sctp_free_remote_addr(chk->whoTo);
8075                                                 chk->whoTo = net;
8076                                                 atomic_add_int(&chk->whoTo->ref_count, 1);
8077                                         }
8078                                 } else if (chk->whoTo != net) {
8079                                         /* No, not sent to this net */
8080                                         continue;
8081                                 }
8082                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8083                                         /*-
8084                                          * strange, we have a chunk that is
8085                                          * to big for its destination and
8086                                          * yet no fragment ok flag.
8087                                          * Something went wrong when the
8088                                          * PMTU changed...we did not mark
8089                                          * this chunk for some reason?? I
8090                                          * will fix it here by letting IP
8091                                          * fragment it for now and printing
8092                                          * a warning. This really should not
8093                                          * happen ...
8094                                          */
8095                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8096                                             chk->send_size, mtu);
8097                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8098                                 }
8099                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8100                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8101                                         struct sctp_data_chunk *dchkh;
8102
8103                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8104                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8105                                 }
8106                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8107                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8108                                         /* ok we will add this one */
8109
8110                                         /*
8111                                          * Add an AUTH chunk, if chunk
8112                                          * requires it, save the offset into
8113                                          * the chain for AUTH
8114                                          */
8115                                         if (data_auth_reqd) {
8116                                                 if (auth == NULL) {
8117                                                         outchain = sctp_add_auth_chunk(outchain,
8118                                                             &endoutchain,
8119                                                             &auth,
8120                                                             &auth_offset,
8121                                                             stcb,
8122                                                             SCTP_DATA);
8123                                                         auth_keyid = chk->auth_keyid;
8124                                                         override_ok = 0;
8125                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8126                                                 } else if (override_ok) {
8127                                                         /*
8128                                                          * use this data's
8129                                                          * keyid
8130                                                          */
8131                                                         auth_keyid = chk->auth_keyid;
8132                                                         override_ok = 0;
8133                                                 } else if (auth_keyid != chk->auth_keyid) {
8134                                                         /*
8135                                                          * different keyid,
8136                                                          * so done bundling
8137                                                          */
8138                                                         break;
8139                                                 }
8140                                         }
8141                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8142                                             chk->send_size, chk->copy_by_ref);
8143                                         if (outchain == NULL) {
8144                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8145                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8146                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8147                                                 }
8148                                                 *reason_code = 3;
8149                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8150                                                 return (ENOMEM);
8151                                         }
8152                                         /* upate our MTU size */
8153                                         /* Do clear IP_DF ? */
8154                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8155                                                 no_fragmentflg = 0;
8156                                         }
8157                                         /* unsigned subtraction of mtu */
8158                                         if (mtu > chk->send_size)
8159                                                 mtu -= chk->send_size;
8160                                         else
8161                                                 mtu = 0;
8162                                         /* unsigned subtraction of r_mtu */
8163                                         if (r_mtu > chk->send_size)
8164                                                 r_mtu -= chk->send_size;
8165                                         else
8166                                                 r_mtu = 0;
8167
8168                                         to_out += chk->send_size;
8169                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8170 #ifdef INVARIANTS
8171                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8172 #else
8173                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8174                                                     mx_mtu, to_out);
8175 #endif
8176                                         }
8177                                         chk->window_probe = 0;
8178                                         data_list[bundle_at++] = chk;
8179                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8180                                                 mtu = 0;
8181                                                 break;
8182                                         }
8183                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8184                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8185                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8186                                                 } else {
8187                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8188                                                 }
8189                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8190                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8191                                                         /*
8192                                                          * Count number of
8193                                                          * user msg's that
8194                                                          * were fragmented
8195                                                          * we do this by
8196                                                          * counting when we
8197                                                          * see a LAST
8198                                                          * fragment only.
8199                                                          */
8200                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8201                                         }
8202                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8203                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8204                                                         data_list[0]->window_probe = 1;
8205                                                         net->window_probe = 1;
8206                                                 }
8207                                                 break;
8208                                         }
8209                                 } else {
8210                                         /*
8211                                          * Must be sent in order of the
8212                                          * TSN's (on a network)
8213                                          */
8214                                         break;
8215                                 }
8216                         }       /* for (chunk gather loop for this net) */
8217                 }               /* if asoc.state OPEN */
8218 no_data_fill:
8219                 /* Is there something to send for this destination? */
8220                 if (outchain) {
8221                         /* We may need to start a control timer or two */
8222                         if (asconf) {
8223                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8224                                     stcb, net);
8225                                 /*
8226                                  * do NOT clear the asconf flag as it is
8227                                  * used to do appropriate source address
8228                                  * selection.
8229                                  */
8230                         }
8231                         if (cookie) {
8232                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8233                                 cookie = 0;
8234                         }
8235                         /* must start a send timer if data is being sent */
8236                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8237                                 /*
8238                                  * no timer running on this destination
8239                                  * restart it.
8240                                  */
8241                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8242                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8243                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8244                                     pf_hbflag &&
8245                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8246                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8247                                 /*
8248                                  * JRS 5/14/07 - If a HB has been sent to a
8249                                  * PF destination and no T3 timer is
8250                                  * currently running, start the T3 timer to
8251                                  * track the HBs that were sent.
8252                                  */
8253                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8254                         }
8255                         /* Now send it, if there is anything to send :> */
8256                         if ((error = sctp_lowlevel_chunk_output(inp,
8257                             stcb,
8258                             net,
8259                             (struct sockaddr *)&net->ro._l_addr,
8260                             outchain,
8261                             auth_offset,
8262                             auth,
8263                             auth_keyid,
8264                             no_fragmentflg,
8265                             bundle_at,
8266                             data_list[0],
8267                             asconf,
8268                             inp->sctp_lport, stcb->rport,
8269                             htonl(stcb->asoc.peer_vtag),
8270                             net->port, so_locked, NULL))) {
8271                                 /* error, we could not output */
8272                                 if (error == ENOBUFS) {
8273                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8274                                         asoc->ifp_had_enobuf = 1;
8275                                 }
8276                                 if (from_where == 0) {
8277                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8278                                 }
8279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8280                                 if (hbflag) {
8281                                         if (*now_filled == 0) {
8282                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8283                                                 *now_filled = 1;
8284                                                 *now = net->last_sent_time;
8285                                         } else {
8286                                                 net->last_sent_time = *now;
8287                                         }
8288                                         hbflag = 0;
8289                                 }
8290                                 if (error == EHOSTUNREACH) {
8291                                         /*
8292                                          * Destination went unreachable
8293                                          * during this send
8294                                          */
8295                                         sctp_move_to_an_alt(stcb, asoc, net);
8296                                 }
8297                                 *reason_code = 6;
8298                                 /*-
8299                                  * I add this line to be paranoid. As far as
8300                                  * I can tell the continue, takes us back to
8301                                  * the top of the for, but just to make sure
8302                                  * I will reset these again here.
8303                                  */
8304                                 ctl_cnt = bundle_at = 0;
8305                                 continue;       /* This takes us back to the
8306                                                  * for() for the nets. */
8307                         } else {
8308                                 asoc->ifp_had_enobuf = 0;
8309                         }
8310                         outchain = endoutchain = NULL;
8311                         auth = NULL;
8312                         auth_offset = 0;
8313                         if (bundle_at || hbflag) {
8314                                 /* For data/asconf and hb set time */
8315                                 if (*now_filled == 0) {
8316                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8317                                         *now_filled = 1;
8318                                         *now = net->last_sent_time;
8319                                 } else {
8320                                         net->last_sent_time = *now;
8321                                 }
8322                         }
8323                         if (!no_out_cnt) {
8324                                 *num_out += (ctl_cnt + bundle_at);
8325                         }
8326                         if (bundle_at) {
8327                                 /* setup for a RTO measurement */
8328                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8329                                 /* fill time if not already filled */
8330                                 if (*now_filled == 0) {
8331                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8332                                         *now_filled = 1;
8333                                         *now = asoc->time_last_sent;
8334                                 } else {
8335                                         asoc->time_last_sent = *now;
8336                                 }
8337                                 data_list[0]->do_rtt = 1;
8338                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8339                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8340                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8341                                         if (net->flight_size < net->cwnd) {
8342                                                 /* start or restart it */
8343                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8344                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8345                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8346                                                 }
8347                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8348                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8349                                         } else {
8350                                                 /* stop it if its running */
8351                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8352                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8353                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8354                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8355                                                 }
8356                                         }
8357                                 }
8358                         }
8359                         if (one_chunk) {
8360                                 break;
8361                         }
8362                 }
8363                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8364                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8365                 }
8366         }
8367         if (old_start_at == NULL) {
8368                 old_start_at = start_at;
8369                 start_at = TAILQ_FIRST(&asoc->nets);
8370                 if (old_start_at)
8371                         goto again_one_more_time;
8372         }
8373         /*
8374          * At the end there should be no NON timed chunks hanging on this
8375          * queue.
8376          */
8377         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8378                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8379         }
8380         if ((*num_out == 0) && (*reason_code == 0)) {
8381                 *reason_code = 4;
8382         } else {
8383                 *reason_code = 5;
8384         }
8385         sctp_clean_up_ctl(stcb, asoc);
8386         return (0);
8387 }
8388
8389 void
8390 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8391 {
8392         /*-
8393          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8394          * the control chunk queue.
8395          */
8396         struct sctp_chunkhdr *hdr;
8397         struct sctp_tmit_chunk *chk;
8398         struct mbuf *mat;
8399
8400         SCTP_TCB_LOCK_ASSERT(stcb);
8401         sctp_alloc_a_chunk(stcb, chk);
8402         if (chk == NULL) {
8403                 /* no memory */
8404                 sctp_m_freem(op_err);
8405                 return;
8406         }
8407         chk->copy_by_ref = 0;
8408         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8409         if (op_err == NULL) {
8410                 sctp_free_a_chunk(stcb, chk);
8411                 return;
8412         }
8413         chk->send_size = 0;
8414         mat = op_err;
8415         while (mat != NULL) {
8416                 chk->send_size += SCTP_BUF_LEN(mat);
8417                 mat = SCTP_BUF_NEXT(mat);
8418         }
8419         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8420         chk->rec.chunk_id.can_take_data = 1;
8421         chk->sent = SCTP_DATAGRAM_UNSENT;
8422         chk->snd_count = 0;
8423         chk->flags = 0;
8424         chk->asoc = &stcb->asoc;
8425         chk->data = op_err;
8426         chk->whoTo = chk->asoc->primary_destination;
8427         atomic_add_int(&chk->whoTo->ref_count, 1);
8428         hdr = mtod(op_err, struct sctp_chunkhdr *);
8429         hdr->chunk_type = SCTP_OPERATION_ERROR;
8430         hdr->chunk_flags = 0;
8431         hdr->chunk_length = htons(chk->send_size);
8432         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8433             chk,
8434             sctp_next);
8435         chk->asoc->ctrl_queue_cnt++;
8436 }
8437
8438 int
8439 sctp_send_cookie_echo(struct mbuf *m,
8440     int offset,
8441     struct sctp_tcb *stcb,
8442     struct sctp_nets *net)
8443 {
8444         /*-
8445          * pull out the cookie and put it at the front of the control chunk
8446          * queue.
8447          */
8448         int at;
8449         struct mbuf *cookie;
8450         struct sctp_paramhdr parm, *phdr;
8451         struct sctp_chunkhdr *hdr;
8452         struct sctp_tmit_chunk *chk;
8453         uint16_t ptype, plen;
8454
8455         /* First find the cookie in the param area */
8456         cookie = NULL;
8457         at = offset + sizeof(struct sctp_init_chunk);
8458
8459         SCTP_TCB_LOCK_ASSERT(stcb);
8460         do {
8461                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8462                 if (phdr == NULL) {
8463                         return (-3);
8464                 }
8465                 ptype = ntohs(phdr->param_type);
8466                 plen = ntohs(phdr->param_length);
8467                 if (ptype == SCTP_STATE_COOKIE) {
8468                         int pad;
8469
8470                         /* found the cookie */
8471                         if ((pad = (plen % 4))) {
8472                                 plen += 4 - pad;
8473                         }
8474                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8475                         if (cookie == NULL) {
8476                                 /* No memory */
8477                                 return (-2);
8478                         }
8479 #ifdef SCTP_MBUF_LOGGING
8480                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8481                                 struct mbuf *mat;
8482
8483                                 mat = cookie;
8484                                 while (mat) {
8485                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8486                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8487                                         }
8488                                         mat = SCTP_BUF_NEXT(mat);
8489                                 }
8490                         }
8491 #endif
8492                         break;
8493                 }
8494                 at += SCTP_SIZE32(plen);
8495         } while (phdr);
8496         if (cookie == NULL) {
8497                 /* Did not find the cookie */
8498                 return (-3);
8499         }
8500         /* ok, we got the cookie lets change it into a cookie echo chunk */
8501
8502         /* first the change from param to cookie */
8503         hdr = mtod(cookie, struct sctp_chunkhdr *);
8504         hdr->chunk_type = SCTP_COOKIE_ECHO;
8505         hdr->chunk_flags = 0;
8506         /* get the chunk stuff now and place it in the FRONT of the queue */
8507         sctp_alloc_a_chunk(stcb, chk);
8508         if (chk == NULL) {
8509                 /* no memory */
8510                 sctp_m_freem(cookie);
8511                 return (-5);
8512         }
8513         chk->copy_by_ref = 0;
8514         chk->send_size = plen;
8515         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8516         chk->rec.chunk_id.can_take_data = 0;
8517         chk->sent = SCTP_DATAGRAM_UNSENT;
8518         chk->snd_count = 0;
8519         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8520         chk->asoc = &stcb->asoc;
8521         chk->data = cookie;
8522         chk->whoTo = chk->asoc->primary_destination;
8523         atomic_add_int(&chk->whoTo->ref_count, 1);
8524         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8525         chk->asoc->ctrl_queue_cnt++;
8526         return (0);
8527 }
8528
8529 void
8530 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8531     struct mbuf *m,
8532     int offset,
8533     int chk_length,
8534     struct sctp_nets *net)
8535 {
8536         /*
8537          * take a HB request and make it into a HB ack and send it.
8538          */
8539         struct mbuf *outchain;
8540         struct sctp_chunkhdr *chdr;
8541         struct sctp_tmit_chunk *chk;
8542
8543
8544         if (net == NULL)
8545                 /* must have a net pointer */
8546                 return;
8547
8548         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8549         if (outchain == NULL) {
8550                 /* gak out of memory */
8551                 return;
8552         }
8553 #ifdef SCTP_MBUF_LOGGING
8554         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8555                 struct mbuf *mat;
8556
8557                 mat = outchain;
8558                 while (mat) {
8559                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8560                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8561                         }
8562                         mat = SCTP_BUF_NEXT(mat);
8563                 }
8564         }
8565 #endif
8566         chdr = mtod(outchain, struct sctp_chunkhdr *);
8567         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8568         chdr->chunk_flags = 0;
8569         if (chk_length % 4) {
8570                 /* need pad */
8571                 uint32_t cpthis = 0;
8572                 int padlen;
8573
8574                 padlen = 4 - (chk_length % 4);
8575                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8576         }
8577         sctp_alloc_a_chunk(stcb, chk);
8578         if (chk == NULL) {
8579                 /* no memory */
8580                 sctp_m_freem(outchain);
8581                 return;
8582         }
8583         chk->copy_by_ref = 0;
8584         chk->send_size = chk_length;
8585         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8586         chk->rec.chunk_id.can_take_data = 1;
8587         chk->sent = SCTP_DATAGRAM_UNSENT;
8588         chk->snd_count = 0;
8589         chk->flags = 0;
8590         chk->asoc = &stcb->asoc;
8591         chk->data = outchain;
8592         chk->whoTo = net;
8593         atomic_add_int(&chk->whoTo->ref_count, 1);
8594         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8595         chk->asoc->ctrl_queue_cnt++;
8596 }
8597
8598 void
8599 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8600 {
8601         /* formulate and queue a cookie-ack back to sender */
8602         struct mbuf *cookie_ack;
8603         struct sctp_chunkhdr *hdr;
8604         struct sctp_tmit_chunk *chk;
8605
8606         cookie_ack = NULL;
8607         SCTP_TCB_LOCK_ASSERT(stcb);
8608
8609         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8610         if (cookie_ack == NULL) {
8611                 /* no mbuf's */
8612                 return;
8613         }
8614         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8615         sctp_alloc_a_chunk(stcb, chk);
8616         if (chk == NULL) {
8617                 /* no memory */
8618                 sctp_m_freem(cookie_ack);
8619                 return;
8620         }
8621         chk->copy_by_ref = 0;
8622         chk->send_size = sizeof(struct sctp_chunkhdr);
8623         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8624         chk->rec.chunk_id.can_take_data = 1;
8625         chk->sent = SCTP_DATAGRAM_UNSENT;
8626         chk->snd_count = 0;
8627         chk->flags = 0;
8628         chk->asoc = &stcb->asoc;
8629         chk->data = cookie_ack;
8630         if (chk->asoc->last_control_chunk_from != NULL) {
8631                 chk->whoTo = chk->asoc->last_control_chunk_from;
8632         } else {
8633                 chk->whoTo = chk->asoc->primary_destination;
8634         }
8635         atomic_add_int(&chk->whoTo->ref_count, 1);
8636         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8637         hdr->chunk_type = SCTP_COOKIE_ACK;
8638         hdr->chunk_flags = 0;
8639         hdr->chunk_length = htons(chk->send_size);
8640         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8641         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8642         chk->asoc->ctrl_queue_cnt++;
8643         return;
8644 }
8645
8646
8647 void
8648 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8649 {
8650         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8651         struct mbuf *m_shutdown_ack;
8652         struct sctp_shutdown_ack_chunk *ack_cp;
8653         struct sctp_tmit_chunk *chk;
8654
8655         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8656         if (m_shutdown_ack == NULL) {
8657                 /* no mbuf's */
8658                 return;
8659         }
8660         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8661         sctp_alloc_a_chunk(stcb, chk);
8662         if (chk == NULL) {
8663                 /* no memory */
8664                 sctp_m_freem(m_shutdown_ack);
8665                 return;
8666         }
8667         chk->copy_by_ref = 0;
8668         chk->send_size = sizeof(struct sctp_chunkhdr);
8669         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8670         chk->rec.chunk_id.can_take_data = 1;
8671         chk->sent = SCTP_DATAGRAM_UNSENT;
8672         chk->snd_count = 0;
8673         chk->flags = 0;
8674         chk->asoc = &stcb->asoc;
8675         chk->data = m_shutdown_ack;
8676         chk->whoTo = net;
8677         atomic_add_int(&net->ref_count, 1);
8678
8679         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8680         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8681         ack_cp->ch.chunk_flags = 0;
8682         ack_cp->ch.chunk_length = htons(chk->send_size);
8683         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8684         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8685         chk->asoc->ctrl_queue_cnt++;
8686         return;
8687 }
8688
8689 void
8690 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8691 {
8692         /* formulate and queue a SHUTDOWN to the sender */
8693         struct mbuf *m_shutdown;
8694         struct sctp_shutdown_chunk *shutdown_cp;
8695         struct sctp_tmit_chunk *chk;
8696
8697         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8698         if (m_shutdown == NULL) {
8699                 /* no mbuf's */
8700                 return;
8701         }
8702         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8703         sctp_alloc_a_chunk(stcb, chk);
8704         if (chk == NULL) {
8705                 /* no memory */
8706                 sctp_m_freem(m_shutdown);
8707                 return;
8708         }
8709         chk->copy_by_ref = 0;
8710         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8711         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8712         chk->rec.chunk_id.can_take_data = 1;
8713         chk->sent = SCTP_DATAGRAM_UNSENT;
8714         chk->snd_count = 0;
8715         chk->flags = 0;
8716         chk->asoc = &stcb->asoc;
8717         chk->data = m_shutdown;
8718         chk->whoTo = net;
8719         atomic_add_int(&net->ref_count, 1);
8720
8721         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8722         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8723         shutdown_cp->ch.chunk_flags = 0;
8724         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8725         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8726         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8727         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8728         chk->asoc->ctrl_queue_cnt++;
8729         return;
8730 }
8731
8732 void
8733 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8734 {
8735         /*
8736          * formulate and queue an ASCONF to the peer. ASCONF parameters
8737          * should be queued on the assoc queue.
8738          */
8739         struct sctp_tmit_chunk *chk;
8740         struct mbuf *m_asconf;
8741         int len;
8742
8743         SCTP_TCB_LOCK_ASSERT(stcb);
8744
8745         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8746             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8747                 /* can't send a new one if there is one in flight already */
8748                 return;
8749         }
8750         /* compose an ASCONF chunk, maximum length is PMTU */
8751         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8752         if (m_asconf == NULL) {
8753                 return;
8754         }
8755         sctp_alloc_a_chunk(stcb, chk);
8756         if (chk == NULL) {
8757                 /* no memory */
8758                 sctp_m_freem(m_asconf);
8759                 return;
8760         }
8761         chk->copy_by_ref = 0;
8762         chk->data = m_asconf;
8763         chk->send_size = len;
8764         chk->rec.chunk_id.id = SCTP_ASCONF;
8765         chk->rec.chunk_id.can_take_data = 0;
8766         chk->sent = SCTP_DATAGRAM_UNSENT;
8767         chk->snd_count = 0;
8768         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8769         chk->asoc = &stcb->asoc;
8770         chk->whoTo = net;
8771         atomic_add_int(&chk->whoTo->ref_count, 1);
8772         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8773         chk->asoc->ctrl_queue_cnt++;
8774         return;
8775 }
8776
8777 void
8778 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8779 {
8780         /*
8781          * formulate and queue a asconf-ack back to sender. the asconf-ack
8782          * must be stored in the tcb.
8783          */
8784         struct sctp_tmit_chunk *chk;
8785         struct sctp_asconf_ack *ack, *latest_ack;
8786         struct mbuf *m_ack, *m;
8787         struct sctp_nets *net = NULL;
8788
8789         SCTP_TCB_LOCK_ASSERT(stcb);
8790         /* Get the latest ASCONF-ACK */
8791         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8792         if (latest_ack == NULL) {
8793                 return;
8794         }
8795         if (latest_ack->last_sent_to != NULL &&
8796             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8797                 /* we're doing a retransmission */
8798                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8799                 if (net == NULL) {
8800                         /* no alternate */
8801                         if (stcb->asoc.last_control_chunk_from == NULL)
8802                                 net = stcb->asoc.primary_destination;
8803                         else
8804                                 net = stcb->asoc.last_control_chunk_from;
8805                 }
8806         } else {
8807                 /* normal case */
8808                 if (stcb->asoc.last_control_chunk_from == NULL)
8809                         net = stcb->asoc.primary_destination;
8810                 else
8811                         net = stcb->asoc.last_control_chunk_from;
8812         }
8813         latest_ack->last_sent_to = net;
8814
8815         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8816                 if (ack->data == NULL) {
8817                         continue;
8818                 }
8819                 /* copy the asconf_ack */
8820                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8821                 if (m_ack == NULL) {
8822                         /* couldn't copy it */
8823                         return;
8824                 }
8825 #ifdef SCTP_MBUF_LOGGING
8826                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8827                         struct mbuf *mat;
8828
8829                         mat = m_ack;
8830                         while (mat) {
8831                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8832                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8833                                 }
8834                                 mat = SCTP_BUF_NEXT(mat);
8835                         }
8836                 }
8837 #endif
8838
8839                 sctp_alloc_a_chunk(stcb, chk);
8840                 if (chk == NULL) {
8841                         /* no memory */
8842                         if (m_ack)
8843                                 sctp_m_freem(m_ack);
8844                         return;
8845                 }
8846                 chk->copy_by_ref = 0;
8847
8848                 chk->whoTo = net;
8849                 chk->data = m_ack;
8850                 chk->send_size = 0;
8851                 /* Get size */
8852                 m = m_ack;
8853                 chk->send_size = ack->len;
8854                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8855                 chk->rec.chunk_id.can_take_data = 1;
8856                 chk->sent = SCTP_DATAGRAM_UNSENT;
8857                 chk->snd_count = 0;
8858                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8859                 chk->asoc = &stcb->asoc;
8860                 atomic_add_int(&chk->whoTo->ref_count, 1);
8861
8862                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8863                 chk->asoc->ctrl_queue_cnt++;
8864         }
8865         return;
8866 }
8867
8868
8869 static int
8870 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8871     struct sctp_tcb *stcb,
8872     struct sctp_association *asoc,
8873     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8874 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8875     SCTP_UNUSED
8876 #endif
8877 )
8878 {
8879         /*-
8880          * send out one MTU of retransmission. If fast_retransmit is
8881          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8882          * rwnd. For a Cookie or Asconf in the control chunk queue we
8883          * retransmit them by themselves.
8884          *
8885          * For data chunks we will pick out the lowest TSN's in the sent_queue
8886          * marked for resend and bundle them all together (up to a MTU of
8887          * destination). The address to send to should have been
8888          * selected/changed where the retransmission was marked (i.e. in FR
8889          * or t3-timeout routines).
8890          */
8891         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8892         struct sctp_tmit_chunk *chk, *fwd;
8893         struct mbuf *m, *endofchain;
8894         struct sctp_nets *net = NULL;
8895         uint32_t tsns_sent = 0;
8896         int no_fragmentflg, bundle_at, cnt_thru;
8897         unsigned int mtu;
8898         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8899         struct sctp_auth_chunk *auth = NULL;
8900         uint32_t auth_offset = 0;
8901         uint16_t auth_keyid;
8902         int override_ok = 1;
8903         int data_auth_reqd = 0;
8904         uint32_t dmtu = 0;
8905
8906         SCTP_TCB_LOCK_ASSERT(stcb);
8907         tmr_started = ctl_cnt = bundle_at = error = 0;
8908         no_fragmentflg = 1;
8909         fwd_tsn = 0;
8910         *cnt_out = 0;
8911         fwd = NULL;
8912         endofchain = m = NULL;
8913         auth_keyid = stcb->asoc.authinfo.active_keyid;
8914 #ifdef SCTP_AUDITING_ENABLED
8915         sctp_audit_log(0xC3, 1);
8916 #endif
8917         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8918             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8919                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8920                     asoc->sent_queue_retran_cnt);
8921                 asoc->sent_queue_cnt = 0;
8922                 asoc->sent_queue_cnt_removeable = 0;
8923                 /* send back 0/0 so we enter normal transmission */
8924                 *cnt_out = 0;
8925                 return (0);
8926         }
8927         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8928                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8929                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8930                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8931                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8932                                 if (chk != asoc->str_reset) {
8933                                         /*
8934                                          * not eligible for retran if its
8935                                          * not ours
8936                                          */
8937                                         continue;
8938                                 }
8939                         }
8940                         ctl_cnt++;
8941                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8942                                 fwd_tsn = 1;
8943                                 fwd = chk;
8944                         }
8945                         /*
8946                          * Add an AUTH chunk, if chunk requires it save the
8947                          * offset into the chain for AUTH
8948                          */
8949                         if ((auth == NULL) &&
8950                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8951                             stcb->asoc.peer_auth_chunks))) {
8952                                 m = sctp_add_auth_chunk(m, &endofchain,
8953                                     &auth, &auth_offset,
8954                                     stcb,
8955                                     chk->rec.chunk_id.id);
8956                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8957                         }
8958                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8959                         break;
8960                 }
8961         }
8962         one_chunk = 0;
8963         cnt_thru = 0;
8964         /* do we have control chunks to retransmit? */
8965         if (m != NULL) {
8966                 /* Start a timer no matter if we suceed or fail */
8967                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8968                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8969                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8970                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8971                 chk->snd_count++;       /* update our count */
8972                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8973                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
8974                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
8975                     no_fragmentflg, 0, NULL, 0,
8976                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
8977                     chk->whoTo->port, so_locked, NULL))) {
8978                         SCTP_STAT_INCR(sctps_lowlevelerr);
8979                         return (error);
8980                 }
8981                 m = endofchain = NULL;
8982                 auth = NULL;
8983                 auth_offset = 0;
8984                 /*
8985                  * We don't want to mark the net->sent time here since this
8986                  * we use this for HB and retrans cannot measure RTT
8987                  */
8988                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8989                 *cnt_out += 1;
8990                 chk->sent = SCTP_DATAGRAM_SENT;
8991                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8992                 if (fwd_tsn == 0) {
8993                         return (0);
8994                 } else {
8995                         /* Clean up the fwd-tsn list */
8996                         sctp_clean_up_ctl(stcb, asoc);
8997                         return (0);
8998                 }
8999         }
9000         /*
9001          * Ok, it is just data retransmission we need to do or that and a
9002          * fwd-tsn with it all.
9003          */
9004         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9005                 return (SCTP_RETRAN_DONE);
9006         }
9007         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9008             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9009                 /* not yet open, resend the cookie and that is it */
9010                 return (1);
9011         }
9012 #ifdef SCTP_AUDITING_ENABLED
9013         sctp_auditing(20, inp, stcb, NULL);
9014 #endif
9015         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9016         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9017                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9018                         /* No, not sent to this net or not ready for rtx */
9019                         continue;
9020                 }
9021                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9022                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9023                         /* Gak, we have exceeded max unlucky retran, abort! */
9024                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9025                             chk->snd_count,
9026                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9027                         atomic_add_int(&stcb->asoc.refcnt, 1);
9028                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9029                         SCTP_TCB_LOCK(stcb);
9030                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9031                         return (SCTP_RETRAN_EXIT);
9032                 }
9033                 /* pick up the net */
9034                 net = chk->whoTo;
9035                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9036                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9037                 } else {
9038                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9039                 }
9040
9041                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9042                         /* No room in peers rwnd */
9043                         uint32_t tsn;
9044
9045                         tsn = asoc->last_acked_seq + 1;
9046                         if (tsn == chk->rec.data.TSN_seq) {
9047                                 /*
9048                                  * we make a special exception for this
9049                                  * case. The peer has no rwnd but is missing
9050                                  * the lowest chunk.. which is probably what
9051                                  * is holding up the rwnd.
9052                                  */
9053                                 goto one_chunk_around;
9054                         }
9055                         return (1);
9056                 }
9057 one_chunk_around:
9058                 if (asoc->peers_rwnd < mtu) {
9059                         one_chunk = 1;
9060                         if ((asoc->peers_rwnd == 0) &&
9061                             (asoc->total_flight == 0)) {
9062                                 chk->window_probe = 1;
9063                                 chk->whoTo->window_probe = 1;
9064                         }
9065                 }
9066 #ifdef SCTP_AUDITING_ENABLED
9067                 sctp_audit_log(0xC3, 2);
9068 #endif
9069                 bundle_at = 0;
9070                 m = NULL;
9071                 net->fast_retran_ip = 0;
9072                 if (chk->rec.data.doing_fast_retransmit == 0) {
9073                         /*
9074                          * if no FR in progress skip destination that have
9075                          * flight_size > cwnd.
9076                          */
9077                         if (net->flight_size >= net->cwnd) {
9078                                 continue;
9079                         }
9080                 } else {
9081                         /*
9082                          * Mark the destination net to have FR recovery
9083                          * limits put on it.
9084                          */
9085                         *fr_done = 1;
9086                         net->fast_retran_ip = 1;
9087                 }
9088
9089                 /*
9090                  * if no AUTH is yet included and this chunk requires it,
9091                  * make sure to account for it.  We don't apply the size
9092                  * until the AUTH chunk is actually added below in case
9093                  * there is no room for this chunk.
9094                  */
9095                 if (data_auth_reqd && (auth == NULL)) {
9096                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9097                 } else
9098                         dmtu = 0;
9099
9100                 if ((chk->send_size <= (mtu - dmtu)) ||
9101                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9102                         /* ok we will add this one */
9103                         if (data_auth_reqd) {
9104                                 if (auth == NULL) {
9105                                         m = sctp_add_auth_chunk(m,
9106                                             &endofchain,
9107                                             &auth,
9108                                             &auth_offset,
9109                                             stcb,
9110                                             SCTP_DATA);
9111                                         auth_keyid = chk->auth_keyid;
9112                                         override_ok = 0;
9113                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9114                                 } else if (override_ok) {
9115                                         auth_keyid = chk->auth_keyid;
9116                                         override_ok = 0;
9117                                 } else if (chk->auth_keyid != auth_keyid) {
9118                                         /* different keyid, so done bundling */
9119                                         break;
9120                                 }
9121                         }
9122                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9123                         if (m == NULL) {
9124                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9125                                 return (ENOMEM);
9126                         }
9127                         /* Do clear IP_DF ? */
9128                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9129                                 no_fragmentflg = 0;
9130                         }
9131                         /* upate our MTU size */
9132                         if (mtu > (chk->send_size + dmtu))
9133                                 mtu -= (chk->send_size + dmtu);
9134                         else
9135                                 mtu = 0;
9136                         data_list[bundle_at++] = chk;
9137                         if (one_chunk && (asoc->total_flight <= 0)) {
9138                                 SCTP_STAT_INCR(sctps_windowprobed);
9139                         }
9140                 }
9141                 if (one_chunk == 0) {
9142                         /*
9143                          * now are there anymore forward from chk to pick
9144                          * up?
9145                          */
9146                         fwd = TAILQ_NEXT(chk, sctp_next);
9147                         while (fwd) {
9148                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9149                                         /* Nope, not for retran */
9150                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9151                                         continue;
9152                                 }
9153                                 if (fwd->whoTo != net) {
9154                                         /* Nope, not the net in question */
9155                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9156                                         continue;
9157                                 }
9158                                 if (data_auth_reqd && (auth == NULL)) {
9159                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9160                                 } else
9161                                         dmtu = 0;
9162                                 if (fwd->send_size <= (mtu - dmtu)) {
9163                                         if (data_auth_reqd) {
9164                                                 if (auth == NULL) {
9165                                                         m = sctp_add_auth_chunk(m,
9166                                                             &endofchain,
9167                                                             &auth,
9168                                                             &auth_offset,
9169                                                             stcb,
9170                                                             SCTP_DATA);
9171                                                         auth_keyid = fwd->auth_keyid;
9172                                                         override_ok = 0;
9173                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9174                                                 } else if (override_ok) {
9175                                                         auth_keyid = fwd->auth_keyid;
9176                                                         override_ok = 0;
9177                                                 } else if (fwd->auth_keyid != auth_keyid) {
9178                                                         /*
9179                                                          * different keyid,
9180                                                          * so done bundling
9181                                                          */
9182                                                         break;
9183                                                 }
9184                                         }
9185                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9186                                         if (m == NULL) {
9187                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9188                                                 return (ENOMEM);
9189                                         }
9190                                         /* Do clear IP_DF ? */
9191                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9192                                                 no_fragmentflg = 0;
9193                                         }
9194                                         /* upate our MTU size */
9195                                         if (mtu > (fwd->send_size + dmtu))
9196                                                 mtu -= (fwd->send_size + dmtu);
9197                                         else
9198                                                 mtu = 0;
9199                                         data_list[bundle_at++] = fwd;
9200                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9201                                                 break;
9202                                         }
9203                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9204                                 } else {
9205                                         /* can't fit so we are done */
9206                                         break;
9207                                 }
9208                         }
9209                 }
9210                 /* Is there something to send for this destination? */
9211                 if (m) {
9212                         /*
9213                          * No matter if we fail/or suceed we should start a
9214                          * timer. A failure is like a lost IP packet :-)
9215                          */
9216                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9217                                 /*
9218                                  * no timer running on this destination
9219                                  * restart it.
9220                                  */
9221                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9222                                 tmr_started = 1;
9223                         }
9224                         /* Now lets send it, if there is anything to send :> */
9225                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9226                             (struct sockaddr *)&net->ro._l_addr, m,
9227                             auth_offset, auth, auth_keyid,
9228                             no_fragmentflg, 0, NULL, 0,
9229                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9230                             net->port, so_locked, NULL))) {
9231                                 /* error, we could not output */
9232                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9233                                 return (error);
9234                         }
9235                         m = endofchain = NULL;
9236                         auth = NULL;
9237                         auth_offset = 0;
9238                         /* For HB's */
9239                         /*
9240                          * We don't want to mark the net->sent time here
9241                          * since this we use this for HB and retrans cannot
9242                          * measure RTT
9243                          */
9244                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9245
9246                         /* For auto-close */
9247                         cnt_thru++;
9248                         if (*now_filled == 0) {
9249                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9250                                 *now = asoc->time_last_sent;
9251                                 *now_filled = 1;
9252                         } else {
9253                                 asoc->time_last_sent = *now;
9254                         }
9255                         *cnt_out += bundle_at;
9256 #ifdef SCTP_AUDITING_ENABLED
9257                         sctp_audit_log(0xC4, bundle_at);
9258 #endif
9259                         if (bundle_at) {
9260                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9261                         }
9262                         for (i = 0; i < bundle_at; i++) {
9263                                 SCTP_STAT_INCR(sctps_sendretransdata);
9264                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9265                                 /*
9266                                  * When we have a revoked data, and we
9267                                  * retransmit it, then we clear the revoked
9268                                  * flag since this flag dictates if we
9269                                  * subtracted from the fs
9270                                  */
9271                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9272                                         /* Deflate the cwnd */
9273                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9274                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9275                                 }
9276                                 data_list[i]->snd_count++;
9277                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9278                                 /* record the time */
9279                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9280                                 if (data_list[i]->book_size_scale) {
9281                                         /*
9282                                          * need to double the book size on
9283                                          * this one
9284                                          */
9285                                         data_list[i]->book_size_scale = 0;
9286                                         /*
9287                                          * Since we double the booksize, we
9288                                          * must also double the output queue
9289                                          * size, since this get shrunk when
9290                                          * we free by this amount.
9291                                          */
9292                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9293                                         data_list[i]->book_size *= 2;
9294
9295
9296                                 } else {
9297                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9298                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9299                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9300                                         }
9301                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9302                                             (uint32_t) (data_list[i]->send_size +
9303                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9304                                 }
9305                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9306                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9307                                             data_list[i]->whoTo->flight_size,
9308                                             data_list[i]->book_size,
9309                                             (uintptr_t) data_list[i]->whoTo,
9310                                             data_list[i]->rec.data.TSN_seq);
9311                                 }
9312                                 sctp_flight_size_increase(data_list[i]);
9313                                 sctp_total_flight_increase(stcb, data_list[i]);
9314                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9315                                         /* SWS sender side engages */
9316                                         asoc->peers_rwnd = 0;
9317                                 }
9318                                 if ((i == 0) &&
9319                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9320                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9321                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9322                                             (tmr_started == 0)) {
9323                                                 /*-
9324                                                  * ok we just fast-retrans'd
9325                                                  * the lowest TSN, i.e the
9326                                                  * first on the list. In
9327                                                  * this case we want to give
9328                                                  * some more time to get a
9329                                                  * SACK back without a
9330                                                  * t3-expiring.
9331                                                  */
9332                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9333                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9334                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9335                                         }
9336                                 }
9337                         }
9338                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9339                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9340                         }
9341 #ifdef SCTP_AUDITING_ENABLED
9342                         sctp_auditing(21, inp, stcb, NULL);
9343 #endif
9344                 } else {
9345                         /* None will fit */
9346                         return (1);
9347                 }
9348                 if (asoc->sent_queue_retran_cnt <= 0) {
9349                         /* all done we have no more to retran */
9350                         asoc->sent_queue_retran_cnt = 0;
9351                         break;
9352                 }
9353                 if (one_chunk) {
9354                         /* No more room in rwnd */
9355                         return (1);
9356                 }
9357                 /* stop the for loop here. we sent out a packet */
9358                 break;
9359         }
9360         return (0);
9361 }
9362
9363
9364 static int
9365 sctp_timer_validation(struct sctp_inpcb *inp,
9366     struct sctp_tcb *stcb,
9367     struct sctp_association *asoc,
9368     int ret)
9369 {
9370         struct sctp_nets *net;
9371
9372         /* Validate that a timer is running somewhere */
9373         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9374                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9375                         /* Here is a timer */
9376                         return (ret);
9377                 }
9378         }
9379         SCTP_TCB_LOCK_ASSERT(stcb);
9380         /* Gak, we did not have a timer somewhere */
9381         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9382         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9383         return (ret);
9384 }
9385
9386 void
9387 sctp_chunk_output(struct sctp_inpcb *inp,
9388     struct sctp_tcb *stcb,
9389     int from_where,
9390     int so_locked
9391 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9392     SCTP_UNUSED
9393 #endif
9394 )
9395 {
9396         /*-
9397          * Ok this is the generic chunk service queue. we must do the
9398          * following:
9399          * - See if there are retransmits pending, if so we must
9400          *   do these first.
9401          * - Service the stream queue that is next, moving any
9402          *   message (note I must get a complete message i.e.
9403          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9404          *   TSN's
9405          * - Check to see if the cwnd/rwnd allows any output, if so we
9406          *   go ahead and fomulate and send the low level chunks. Making sure
9407          *   to combine any control in the control chunk queue also.
9408          */
9409         struct sctp_association *asoc;
9410         struct sctp_nets *net;
9411         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9412             burst_cnt = 0, burst_limit = 0;
9413         struct timeval now;
9414         int now_filled = 0;
9415         int nagle_on = 0;
9416         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9417         int un_sent = 0;
9418         int fr_done, tot_frs = 0;
9419
9420         asoc = &stcb->asoc;
9421         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9422                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9423                         nagle_on = 0;
9424                 } else {
9425                         nagle_on = 1;
9426                 }
9427         }
9428         SCTP_TCB_LOCK_ASSERT(stcb);
9429
9430         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9431
9432         if ((un_sent <= 0) &&
9433             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9434             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9435             (asoc->sent_queue_retran_cnt == 0)) {
9436                 /* Nothing to do unless there is something to be sent left */
9437                 return;
9438         }
9439         /*
9440          * Do we have something to send, data or control AND a sack timer
9441          * running, if so piggy-back the sack.
9442          */
9443         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9444                 /*
9445                  * EY if nr_sacks used then send an nr-sack , a sack
9446                  * otherwise
9447                  */
9448                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack)
9449                         sctp_send_nr_sack(stcb);
9450                 else
9451                         sctp_send_sack(stcb);
9452                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9453         }
9454         while (asoc->sent_queue_retran_cnt) {
9455                 /*-
9456                  * Ok, it is retransmission time only, we send out only ONE
9457                  * packet with a single call off to the retran code.
9458                  */
9459                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9460                         /*-
9461                          * Special hook for handling cookiess discarded
9462                          * by peer that carried data. Send cookie-ack only
9463                          * and then the next call with get the retran's.
9464                          */
9465                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9466                             from_where,
9467                             &now, &now_filled, frag_point, so_locked);
9468                         return;
9469                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9470                         /* if its not from a HB then do it */
9471                         fr_done = 0;
9472                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9473                         if (fr_done) {
9474                                 tot_frs++;
9475                         }
9476                 } else {
9477                         /*
9478                          * its from any other place, we don't allow retran
9479                          * output (only control)
9480                          */
9481                         ret = 1;
9482                 }
9483                 if (ret > 0) {
9484                         /* Can't send anymore */
9485                         /*-
9486                          * now lets push out control by calling med-level
9487                          * output once. this assures that we WILL send HB's
9488                          * if queued too.
9489                          */
9490                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9491                             from_where,
9492                             &now, &now_filled, frag_point, so_locked);
9493 #ifdef SCTP_AUDITING_ENABLED
9494                         sctp_auditing(8, inp, stcb, NULL);
9495 #endif
9496                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9497                         return;
9498                 }
9499                 if (ret < 0) {
9500                         /*-
9501                          * The count was off.. retran is not happening so do
9502                          * the normal retransmission.
9503                          */
9504 #ifdef SCTP_AUDITING_ENABLED
9505                         sctp_auditing(9, inp, stcb, NULL);
9506 #endif
9507                         if (ret == SCTP_RETRAN_EXIT) {
9508                                 return;
9509                         }
9510                         break;
9511                 }
9512                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9513                         /* Only one transmission allowed out of a timeout */
9514 #ifdef SCTP_AUDITING_ENABLED
9515                         sctp_auditing(10, inp, stcb, NULL);
9516 #endif
9517                         /* Push out any control */
9518                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9519                             &now, &now_filled, frag_point, so_locked);
9520                         return;
9521                 }
9522                 if (tot_frs > asoc->max_burst) {
9523                         /* Hit FR burst limit */
9524                         return;
9525                 }
9526                 if ((num_out == 0) && (ret == 0)) {
9527
9528                         /* No more retrans to send */
9529                         break;
9530                 }
9531         }
9532 #ifdef SCTP_AUDITING_ENABLED
9533         sctp_auditing(12, inp, stcb, NULL);
9534 #endif
9535         /* Check for bad destinations, if they exist move chunks around. */
9536         burst_limit = asoc->max_burst;
9537         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9538                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9539                     SCTP_ADDR_NOT_REACHABLE) {
9540                         /*-
9541                          * if possible move things off of this address we
9542                          * still may send below due to the dormant state but
9543                          * we try to find an alternate address to send to
9544                          * and if we have one we move all queued data on the
9545                          * out wheel to this alternate address.
9546                          */
9547                         if (net->ref_count > 1)
9548                                 sctp_move_to_an_alt(stcb, asoc, net);
9549                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9550                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9551                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9552                         /*
9553                          * JRS 5/14/07 - If CMT PF is on and the current
9554                          * destination is in PF state, move all queued data
9555                          * to an alternate desination.
9556                          */
9557                         if (net->ref_count > 1)
9558                                 sctp_move_to_an_alt(stcb, asoc, net);
9559                 } else {
9560                         /*-
9561                          * if ((asoc->sat_network) || (net->addr_is_local))
9562                          * { burst_limit = asoc->max_burst *
9563                          * SCTP_SAT_NETWORK_BURST_INCR; }
9564                          */
9565                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9566                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9567                                         /*
9568                                          * JRS - Use the congestion control
9569                                          * given in the congestion control
9570                                          * module
9571                                          */
9572                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9573                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9574                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9575                                         }
9576                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9577                                 }
9578                                 net->fast_retran_ip = 0;
9579                         } else {
9580                                 if (net->flight_size == 0) {
9581                                         /* Should be decaying the cwnd here */
9582                                         ;
9583                                 }
9584                         }
9585                 }
9586
9587         }
9588         burst_cnt = 0;
9589         do {
9590                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9591                     &reason_code, 0, from_where,
9592                     &now, &now_filled, frag_point, so_locked);
9593                 if (error) {
9594                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9595                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9596                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9597                         }
9598                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9599                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9600                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9601                         }
9602                         break;
9603                 }
9604                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9605
9606                 tot_out += num_out;
9607                 burst_cnt++;
9608                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9609                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9610                         if (num_out == 0) {
9611                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9612                         }
9613                 }
9614                 if (nagle_on) {
9615                         /*-
9616                          * When nagle is on, we look at how much is un_sent, then
9617                          * if its smaller than an MTU and we have data in
9618                          * flight we stop.
9619                          */
9620                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9621                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9622                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9623                             (stcb->asoc.total_flight > 0)) {
9624                                 break;
9625                         }
9626                 }
9627                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9628                     TAILQ_EMPTY(&asoc->send_queue) &&
9629                     TAILQ_EMPTY(&asoc->out_wheel)) {
9630                         /* Nothing left to send */
9631                         break;
9632                 }
9633                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9634                         /* Nothing left to send */
9635                         break;
9636                 }
9637         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9638             (burst_cnt < burst_limit)));
9639
9640         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9641                 if (burst_cnt >= burst_limit) {
9642                         SCTP_STAT_INCR(sctps_maxburstqueued);
9643                         asoc->burst_limit_applied = 1;
9644                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9645                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9646                         }
9647                 } else {
9648                         asoc->burst_limit_applied = 0;
9649                 }
9650         }
9651         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9652                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9653         }
9654         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9655             tot_out);
9656
9657         /*-
9658          * Now we need to clean up the control chunk chain if a ECNE is on
9659          * it. It must be marked as UNSENT again so next call will continue
9660          * to send it until such time that we get a CWR, to remove it.
9661          */
9662         if (stcb->asoc.ecn_echo_cnt_onq)
9663                 sctp_fix_ecn_echo(asoc);
9664         return;
9665 }
9666
9667
9668 int
9669 sctp_output(inp, m, addr, control, p, flags)
9670         struct sctp_inpcb *inp;
9671         struct mbuf *m;
9672         struct sockaddr *addr;
9673         struct mbuf *control;
9674         struct thread *p;
9675         int flags;
9676 {
9677         if (inp == NULL) {
9678                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9679                 return (EINVAL);
9680         }
9681         if (inp->sctp_socket == NULL) {
9682                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9683                 return (EINVAL);
9684         }
9685         return (sctp_sosend(inp->sctp_socket,
9686             addr,
9687             (struct uio *)NULL,
9688             m,
9689             control,
9690             flags, p
9691             ));
9692 }
9693
9694 void
9695 send_forward_tsn(struct sctp_tcb *stcb,
9696     struct sctp_association *asoc)
9697 {
9698         struct sctp_tmit_chunk *chk;
9699         struct sctp_forward_tsn_chunk *fwdtsn;
9700         uint32_t advance_peer_ack_point;
9701
9702         SCTP_TCB_LOCK_ASSERT(stcb);
9703         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9704                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9705                         /* mark it to unsent */
9706                         chk->sent = SCTP_DATAGRAM_UNSENT;
9707                         chk->snd_count = 0;
9708                         /* Do we correct its output location? */
9709                         if (chk->whoTo != asoc->primary_destination) {
9710                                 sctp_free_remote_addr(chk->whoTo);
9711                                 chk->whoTo = asoc->primary_destination;
9712                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9713                         }
9714                         goto sctp_fill_in_rest;
9715                 }
9716         }
9717         /* Ok if we reach here we must build one */
9718         sctp_alloc_a_chunk(stcb, chk);
9719         if (chk == NULL) {
9720                 return;
9721         }
9722         chk->copy_by_ref = 0;
9723         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9724         chk->rec.chunk_id.can_take_data = 0;
9725         chk->asoc = asoc;
9726         chk->whoTo = NULL;
9727
9728         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9729         if (chk->data == NULL) {
9730                 sctp_free_a_chunk(stcb, chk);
9731                 return;
9732         }
9733         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9734         chk->sent = SCTP_DATAGRAM_UNSENT;
9735         chk->snd_count = 0;
9736         chk->whoTo = asoc->primary_destination;
9737         atomic_add_int(&chk->whoTo->ref_count, 1);
9738         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9739         asoc->ctrl_queue_cnt++;
9740 sctp_fill_in_rest:
9741         /*-
9742          * Here we go through and fill out the part that deals with
9743          * stream/seq of the ones we skip.
9744          */
9745         SCTP_BUF_LEN(chk->data) = 0;
9746         {
9747                 struct sctp_tmit_chunk *at, *tp1, *last;
9748                 struct sctp_strseq *strseq;
9749                 unsigned int cnt_of_space, i, ovh;
9750                 unsigned int space_needed;
9751                 unsigned int cnt_of_skipped = 0;
9752
9753                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9754                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9755                                 /* no more to look at */
9756                                 break;
9757                         }
9758                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9759                                 /* We don't report these */
9760                                 continue;
9761                         }
9762                         cnt_of_skipped++;
9763                 }
9764                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9765                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9766
9767                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9768
9769                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9770                         ovh = SCTP_MIN_OVERHEAD;
9771                 } else {
9772                         ovh = SCTP_MIN_V4_OVERHEAD;
9773                 }
9774                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9775                         /* trim to a mtu size */
9776                         cnt_of_space = asoc->smallest_mtu - ovh;
9777                 }
9778                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9779                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9780                             0xff, 0, cnt_of_skipped,
9781                             asoc->advanced_peer_ack_point);
9782
9783                 }
9784                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9785                 if (cnt_of_space < space_needed) {
9786                         /*-
9787                          * ok we must trim down the chunk by lowering the
9788                          * advance peer ack point.
9789                          */
9790                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9791                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9792                                     0xff, 0xff, cnt_of_space,
9793                                     space_needed);
9794                         }
9795                         cnt_of_skipped = (cnt_of_space -
9796                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9797                             sizeof(struct sctp_strseq)));
9798                         /*-
9799                          * Go through and find the TSN that will be the one
9800                          * we report.
9801                          */
9802                         at = TAILQ_FIRST(&asoc->sent_queue);
9803                         for (i = 0; i < cnt_of_skipped; i++) {
9804                                 tp1 = TAILQ_NEXT(at, sctp_next);
9805                                 at = tp1;
9806                         }
9807                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9808                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9809                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9810                                     asoc->advanced_peer_ack_point);
9811                         }
9812                         last = at;
9813                         /*-
9814                          * last now points to last one I can report, update
9815                          * peer ack point
9816                          */
9817                         advance_peer_ack_point = last->rec.data.TSN_seq;
9818                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9819                 }
9820                 chk->send_size = space_needed;
9821                 /* Setup the chunk */
9822                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9823                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9824                 fwdtsn->ch.chunk_flags = 0;
9825                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9826                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9827                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9828                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9829                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9830                 fwdtsn++;
9831                 /*-
9832                  * Move pointer to after the fwdtsn and transfer to the
9833                  * strseq pointer.
9834                  */
9835                 strseq = (struct sctp_strseq *)fwdtsn;
9836                 /*-
9837                  * Now populate the strseq list. This is done blindly
9838                  * without pulling out duplicate stream info. This is
9839                  * inefficent but won't harm the process since the peer will
9840                  * look at these in sequence and will thus release anything.
9841                  * It could mean we exceed the PMTU and chop off some that
9842                  * we could have included.. but this is unlikely (aka 1432/4
9843                  * would mean 300+ stream seq's would have to be reported in
9844                  * one FWD-TSN. With a bit of work we can later FIX this to
9845                  * optimize and pull out duplcates.. but it does add more
9846                  * overhead. So for now... not!
9847                  */
9848                 at = TAILQ_FIRST(&asoc->sent_queue);
9849                 for (i = 0; i < cnt_of_skipped; i++) {
9850                         tp1 = TAILQ_NEXT(at, sctp_next);
9851                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9852                                 /* We don't report these */
9853                                 i--;
9854                                 at = tp1;
9855                                 continue;
9856                         }
9857                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9858                                 at->rec.data.fwd_tsn_cnt = 0;
9859                         }
9860                         strseq->stream = ntohs(at->rec.data.stream_number);
9861                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9862                         strseq++;
9863                         at = tp1;
9864                 }
9865         }
9866         return;
9867
9868 }
9869
9870 void
9871 sctp_send_sack(struct sctp_tcb *stcb)
9872 {
9873         /*-
9874          * Queue up a SACK in the control queue. We must first check to see
9875          * if a SACK is somehow on the control queue. If so, we will take
9876          * and and remove the old one.
9877          */
9878         struct sctp_association *asoc;
9879         struct sctp_tmit_chunk *chk, *a_chk;
9880         struct sctp_sack_chunk *sack;
9881         struct sctp_gap_ack_block *gap_descriptor;
9882         struct sack_track *selector;
9883         int mergeable = 0;
9884         int offset;
9885         caddr_t limit;
9886         uint32_t *dup;
9887         int limit_reached = 0;
9888         unsigned int i, jstart, siz, j;
9889         unsigned int num_gap_blocks = 0, space;
9890         int num_dups = 0;
9891         int space_req;
9892
9893         a_chk = NULL;
9894         asoc = &stcb->asoc;
9895         SCTP_TCB_LOCK_ASSERT(stcb);
9896         if (asoc->last_data_chunk_from == NULL) {
9897                 /* Hmm we never received anything */
9898                 return;
9899         }
9900         sctp_set_rwnd(stcb, asoc);
9901         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9902                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9903                         /* Hmm, found a sack already on queue, remove it */
9904                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9905                         asoc->ctrl_queue_cnt++;
9906                         a_chk = chk;
9907                         if (a_chk->data) {
9908                                 sctp_m_freem(a_chk->data);
9909                                 a_chk->data = NULL;
9910                         }
9911                         sctp_free_remote_addr(a_chk->whoTo);
9912                         a_chk->whoTo = NULL;
9913                         break;
9914                 }
9915         }
9916         if (a_chk == NULL) {
9917                 sctp_alloc_a_chunk(stcb, a_chk);
9918                 if (a_chk == NULL) {
9919                         /* No memory so we drop the idea, and set a timer */
9920                         if (stcb->asoc.delayed_ack) {
9921                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9922                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9923                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9924                                     stcb->sctp_ep, stcb, NULL);
9925                         } else {
9926                                 stcb->asoc.send_sack = 1;
9927                         }
9928                         return;
9929                 }
9930                 a_chk->copy_by_ref = 0;
9931                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9932                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9933                 a_chk->rec.chunk_id.can_take_data = 1;
9934         }
9935         /* Clear our pkt counts */
9936         asoc->data_pkts_seen = 0;
9937
9938         a_chk->asoc = asoc;
9939         a_chk->snd_count = 0;
9940         a_chk->send_size = 0;   /* fill in later */
9941         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9942         a_chk->whoTo = NULL;
9943
9944         if ((asoc->numduptsns) ||
9945             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9946             ) {
9947                 /*-
9948                  * Ok, we have some duplicates or the destination for the
9949                  * sack is unreachable, lets see if we can select an
9950                  * alternate than asoc->last_data_chunk_from
9951                  */
9952                 if ((!(asoc->last_data_chunk_from->dest_state &
9953                     SCTP_ADDR_NOT_REACHABLE)) &&
9954                     (asoc->used_alt_onsack > asoc->numnets)) {
9955                         /* We used an alt last time, don't this time */
9956                         a_chk->whoTo = NULL;
9957                 } else {
9958                         asoc->used_alt_onsack++;
9959                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9960                 }
9961                 if (a_chk->whoTo == NULL) {
9962                         /* Nope, no alternate */
9963                         a_chk->whoTo = asoc->last_data_chunk_from;
9964                         asoc->used_alt_onsack = 0;
9965                 }
9966         } else {
9967                 /*
9968                  * No duplicates so we use the last place we received data
9969                  * from.
9970                  */
9971                 asoc->used_alt_onsack = 0;
9972                 a_chk->whoTo = asoc->last_data_chunk_from;
9973         }
9974         if (a_chk->whoTo) {
9975                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9976         }
9977         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9978                 /* no gaps */
9979                 space_req = sizeof(struct sctp_sack_chunk);
9980         } else {
9981                 /* gaps get a cluster */
9982                 space_req = MCLBYTES;
9983         }
9984         /* Ok now lets formulate a MBUF with our sack */
9985         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9986         if ((a_chk->data == NULL) ||
9987             (a_chk->whoTo == NULL)) {
9988                 /* rats, no mbuf memory */
9989                 if (a_chk->data) {
9990                         /* was a problem with the destination */
9991                         sctp_m_freem(a_chk->data);
9992                         a_chk->data = NULL;
9993                 }
9994                 sctp_free_a_chunk(stcb, a_chk);
9995                 /* sa_ignore NO_NULL_CHK */
9996                 if (stcb->asoc.delayed_ack) {
9997                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9998                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9999                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10000                             stcb->sctp_ep, stcb, NULL);
10001                 } else {
10002                         stcb->asoc.send_sack = 1;
10003                 }
10004                 return;
10005         }
10006         /* ok, lets go through and fill it in */
10007         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10008         space = M_TRAILINGSPACE(a_chk->data);
10009         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10010                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10011         }
10012         limit = mtod(a_chk->data, caddr_t);
10013         limit += space;
10014
10015         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10016         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
10017         /* 0x01 is used by nonce for ecn */
10018         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10019             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10020             (asoc->peer_supports_ecn_nonce))
10021                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10022         else
10023                 sack->ch.chunk_flags = 0;
10024
10025         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10026                 /*-
10027                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10028                  * received, then set high bit to 1, else 0. Reset
10029                  * pkts_rcvd.
10030                  */
10031                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10032                 asoc->cmt_dac_pkts_rcvd = 0;
10033         }
10034 #ifdef SCTP_ASOCLOG_OF_TSNS
10035         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10036         stcb->asoc.cumack_log_atsnt++;
10037         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10038                 stcb->asoc.cumack_log_atsnt = 0;
10039         }
10040 #endif
10041         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10042         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10043         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10044
10045         /* reset the readers interpretation */
10046         stcb->freed_by_sorcv_sincelast = 0;
10047
10048         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10049
10050         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10051                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10052         else
10053                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10054
10055         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10056                 offset = 1;
10057                 /*-
10058                  * cum-ack behind the mapping array, so we start and use all
10059                  * entries.
10060                  */
10061                 jstart = 0;
10062         } else {
10063                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10064                 /*-
10065                  * we skip the first one when the cum-ack is at or above the
10066                  * mapping array base. Note this only works if
10067                  */
10068                 jstart = 1;
10069         }
10070         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10071                 /* we have a gap .. maybe */
10072                 for (i = 0; i < siz; i++) {
10073                         selector = &sack_array[asoc->mapping_array[i]];
10074                         if (mergeable && selector->right_edge) {
10075                                 /*
10076                                  * Backup, left and right edges were ok to
10077                                  * merge.
10078                                  */
10079                                 num_gap_blocks--;
10080                                 gap_descriptor--;
10081                         }
10082                         if (selector->num_entries == 0)
10083                                 mergeable = 0;
10084                         else {
10085                                 for (j = jstart; j < selector->num_entries; j++) {
10086                                         if (mergeable && selector->right_edge) {
10087                                                 /*
10088                                                  * do a merge by NOT setting
10089                                                  * the left side
10090                                                  */
10091                                                 mergeable = 0;
10092                                         } else {
10093                                                 /*
10094                                                  * no merge, set the left
10095                                                  * side
10096                                                  */
10097                                                 mergeable = 0;
10098                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10099                                         }
10100                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10101                                         num_gap_blocks++;
10102                                         gap_descriptor++;
10103                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10104                                                 /* no more room */
10105                                                 limit_reached = 1;
10106                                                 break;
10107                                         }
10108                                 }
10109                                 if (selector->left_edge) {
10110                                         mergeable = 1;
10111                                 }
10112                         }
10113                         if (limit_reached) {
10114                                 /* Reached the limit stop */
10115                                 break;
10116                         }
10117                         jstart = 0;
10118                         offset += 8;
10119                 }
10120                 if (num_gap_blocks == 0) {
10121                         /*
10122                          * slide not yet happened, and somehow we got called
10123                          * to send a sack. Cumack needs to move up.
10124                          */
10125                         int abort_flag = 0;
10126
10127                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10128                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10129                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10130                 }
10131         }
10132         /* now we must add any dups we are going to report. */
10133         if ((limit_reached == 0) && (asoc->numduptsns)) {
10134                 dup = (uint32_t *) gap_descriptor;
10135                 for (i = 0; i < asoc->numduptsns; i++) {
10136                         *dup = htonl(asoc->dup_tsns[i]);
10137                         dup++;
10138                         num_dups++;
10139                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10140                                 /* no more room */
10141                                 break;
10142                         }
10143                 }
10144                 asoc->numduptsns = 0;
10145         }
10146         /*
10147          * now that the chunk is prepared queue it to the control chunk
10148          * queue.
10149          */
10150         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10151             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10152             (num_dups * sizeof(int32_t)));
10153         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10154         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10155         sack->sack.num_dup_tsns = htons(num_dups);
10156         sack->ch.chunk_length = htons(a_chk->send_size);
10157         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10158         asoc->ctrl_queue_cnt++;
10159         asoc->send_sack = 0;
10160         SCTP_STAT_INCR(sctps_sendsacks);
10161         return;
10162 }
10163
10164 /* EY - This method will replace sctp_send_sack method if nr_sacks negotiated*/
10165 void
10166 sctp_send_nr_sack(struct sctp_tcb *stcb)
10167 {
10168         /*-
10169          * Queue up an NR-SACK in the control queue. We must first check to see
10170          * if an NR-SACK is somehow on the control queue. If so, we will take
10171          * and and remove the old one.
10172          */
10173         struct sctp_association *asoc;
10174         struct sctp_tmit_chunk *chk, *a_chk;
10175
10176         struct sctp_nr_sack_chunk *nr_sack;
10177
10178         struct sctp_gap_ack_block *gap_descriptor;
10179         struct sctp_nr_gap_ack_block *nr_gap_descriptor;
10180
10181         struct sack_track *selector;
10182         struct sack_track *nr_selector;
10183
10184         /* EY do we need nr_mergeable, NO */
10185         int mergeable = 0;
10186         int offset;
10187         caddr_t limit;
10188         uint32_t *dup;
10189         int limit_reached = 0;
10190         unsigned int i, jstart, siz, j;
10191         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10192         int num_dups = 0;
10193         int space_req;
10194         unsigned int reserved = 0;
10195
10196         a_chk = NULL;
10197         asoc = &stcb->asoc;
10198         SCTP_TCB_LOCK_ASSERT(stcb);
10199         if (asoc->last_data_chunk_from == NULL) {
10200                 /* Hmm we never received anything */
10201                 return;
10202         }
10203         sctp_set_rwnd(stcb, asoc);
10204         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10205                 if (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) {
10206                         /* Hmm, found a sack already on queue, remove it */
10207                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10208                         asoc->ctrl_queue_cnt++;
10209                         a_chk = chk;
10210                         if (a_chk->data) {
10211                                 sctp_m_freem(a_chk->data);
10212                                 a_chk->data = NULL;
10213                         }
10214                         sctp_free_remote_addr(a_chk->whoTo);
10215                         a_chk->whoTo = NULL;
10216                         break;
10217                 }
10218         }
10219         if (a_chk == NULL) {
10220                 sctp_alloc_a_chunk(stcb, a_chk);
10221                 if (a_chk == NULL) {
10222                         /* No memory so we drop the idea, and set a timer */
10223                         if (stcb->asoc.delayed_ack) {
10224                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10225                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10226                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10227                                     stcb->sctp_ep, stcb, NULL);
10228                         } else {
10229                                 stcb->asoc.send_sack = 1;
10230                         }
10231                         return;
10232                 }
10233                 a_chk->copy_by_ref = 0;
10234                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
10235                 a_chk->rec.chunk_id.id = SCTP_NR_SELECTIVE_ACK;
10236                 a_chk->rec.chunk_id.can_take_data = 1;
10237         }
10238         /* Clear our pkt counts */
10239         asoc->data_pkts_seen = 0;
10240
10241         a_chk->asoc = asoc;
10242         a_chk->snd_count = 0;
10243         a_chk->send_size = 0;   /* fill in later */
10244         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10245         a_chk->whoTo = NULL;
10246
10247         if ((asoc->numduptsns) ||
10248             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
10249             ) {
10250                 /*-
10251                  * Ok, we have some duplicates or the destination for the
10252                  * sack is unreachable, lets see if we can select an
10253                  * alternate than asoc->last_data_chunk_from
10254                  */
10255                 if ((!(asoc->last_data_chunk_from->dest_state &
10256                     SCTP_ADDR_NOT_REACHABLE)) &&
10257                     (asoc->used_alt_onsack > asoc->numnets)) {
10258                         /* We used an alt last time, don't this time */
10259                         a_chk->whoTo = NULL;
10260                 } else {
10261                         asoc->used_alt_onsack++;
10262                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10263                 }
10264                 if (a_chk->whoTo == NULL) {
10265                         /* Nope, no alternate */
10266                         a_chk->whoTo = asoc->last_data_chunk_from;
10267                         asoc->used_alt_onsack = 0;
10268                 }
10269         } else {
10270                 /*
10271                  * No duplicates so we use the last place we received data
10272                  * from.
10273                  */
10274                 asoc->used_alt_onsack = 0;
10275                 a_chk->whoTo = asoc->last_data_chunk_from;
10276         }
10277         if (a_chk->whoTo) {
10278                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10279         }
10280         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
10281                 /* no gaps */
10282                 space_req = sizeof(struct sctp_nr_sack_chunk);
10283         } else {
10284                 /* EY - what is this about? */
10285                 /* gaps get a cluster */
10286                 space_req = MCLBYTES;
10287         }
10288         /* Ok now lets formulate a MBUF with our sack */
10289         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10290         if ((a_chk->data == NULL) ||
10291             (a_chk->whoTo == NULL)) {
10292                 /* rats, no mbuf memory */
10293                 if (a_chk->data) {
10294                         /* was a problem with the destination */
10295                         sctp_m_freem(a_chk->data);
10296                         a_chk->data = NULL;
10297                 }
10298                 sctp_free_a_chunk(stcb, a_chk);
10299                 /* sa_ignore NO_NULL_CHK */
10300                 if (stcb->asoc.delayed_ack) {
10301                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10302                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10303                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10304                             stcb->sctp_ep, stcb, NULL);
10305                 } else {
10306                         stcb->asoc.send_sack = 1;
10307                 }
10308                 return;
10309         }
10310         /* ok, lets go through and fill it in */
10311         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10312         space = M_TRAILINGSPACE(a_chk->data);
10313         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10314                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10315         }
10316         limit = mtod(a_chk->data, caddr_t);
10317         limit += space;
10318
10319         nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10320         nr_sack->ch.chunk_type = SCTP_NR_SELECTIVE_ACK;
10321         /* EYJ */
10322         /* 0x01 is used by nonce for ecn */
10323         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
10324             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
10325             (asoc->peer_supports_ecn_nonce))
10326                 nr_sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
10327         else
10328                 nr_sack->ch.chunk_flags = 0;
10329
10330         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10331                 /*-
10332                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10333                  * received, then set high bit to 1, else 0. Reset
10334                  * pkts_rcvd.
10335                  */
10336                 /* EY - TODO: which chunk flag is used in here? -The LSB */
10337                 nr_sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10338                 asoc->cmt_dac_pkts_rcvd = 0;
10339         }
10340 #ifdef SCTP_ASOCLOG_OF_TSNS
10341         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10342         stcb->asoc.cumack_log_atsnt++;
10343         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10344                 stcb->asoc.cumack_log_atsnt = 0;
10345         }
10346 #endif
10347         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10348         nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10349         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10350
10351         /* reset the readers interpretation */
10352         stcb->freed_by_sorcv_sincelast = 0;
10353
10354         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10355
10356         if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn)
10357                 siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10358         else
10359                 siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10360
10361         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10362                 offset = 1;
10363                 /*-
10364                  * cum-ack behind the mapping array, so we start and use all
10365                  * entries.
10366                  */
10367                 jstart = 0;
10368         } else {
10369                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10370                 /*-
10371                  * we skip the first one when the cum-ack is at or above the
10372                  * mapping array base. Note this only works if
10373                  */
10374                 jstart = 1;
10375         }
10376         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
10377                 /* we have a gap .. maybe */
10378                 for (i = 0; i < siz; i++) {
10379                         selector = &sack_array[asoc->mapping_array[i]];
10380                         if (mergeable && selector->right_edge) {
10381                                 /*
10382                                  * Backup, left and right edges were ok to
10383                                  * merge.
10384                                  */
10385                                 num_gap_blocks--;
10386                                 gap_descriptor--;
10387                         }
10388                         if (selector->num_entries == 0)
10389                                 mergeable = 0;
10390                         else {
10391                                 for (j = jstart; j < selector->num_entries; j++) {
10392                                         if (mergeable && selector->right_edge) {
10393                                                 /*
10394                                                  * do a merge by NOT setting
10395                                                  * the left side
10396                                                  */
10397                                                 mergeable = 0;
10398                                         } else {
10399                                                 /*
10400                                                  * no merge, set the left
10401                                                  * side
10402                                                  */
10403                                                 mergeable = 0;
10404                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10405                                         }
10406                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10407                                         num_gap_blocks++;
10408                                         gap_descriptor++;
10409                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10410                                                 /* no more room */
10411                                                 limit_reached = 1;
10412                                                 break;
10413                                         }
10414                                 }
10415                                 if (selector->left_edge) {
10416                                         mergeable = 1;
10417                                 }
10418                         }
10419                         if (limit_reached) {
10420                                 /* Reached the limit stop */
10421                                 break;
10422                         }
10423                         jstart = 0;
10424                         offset += 8;
10425                 }
10426                 if (num_gap_blocks == 0) {
10427                         /*
10428                          * slide not yet happened, and somehow we got called
10429                          * to send a sack. Cumack needs to move up.
10430                          */
10431                         int abort_flag = 0;
10432
10433                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10434                         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10435                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10436                 }
10437         }
10438         /*---------------------------------------------------------filling the nr_gap_ack blocks----------------------------------------------------*/
10439
10440         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)gap_descriptor;
10441
10442         /* EY - there will be gaps + nr_gaps if draining is possible */
10443         if ((SCTP_BASE_SYSCTL(sctp_do_drain)) && (limit_reached == 0)) {
10444
10445                 mergeable = 0;
10446
10447                 if (asoc->highest_tsn_inside_nr_map > asoc->nr_mapping_array_base_tsn)
10448                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn) + 1) + 7) / 8;
10449                 else
10450                         siz = (((MAX_TSN - asoc->nr_mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10451
10452                 if (compare_with_wrap(asoc->nr_mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
10453                         offset = 1;
10454                         /*-
10455                         * cum-ack behind the mapping array, so we start and use all
10456                         * entries.
10457                         */
10458                         jstart = 0;
10459                 } else {
10460                         offset = asoc->nr_mapping_array_base_tsn - asoc->cumulative_tsn;
10461                         /*-
10462                         * we skip the first one when the cum-ack is at or above the
10463                         * mapping array base. Note this only works if
10464                         */
10465                         jstart = 1;
10466                 }
10467                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
10468                         /* we have a gap .. maybe */
10469                         for (i = 0; i < siz; i++) {
10470                                 nr_selector = &sack_array[asoc->nr_mapping_array[i]];
10471                                 if (mergeable && nr_selector->right_edge) {
10472                                         /*
10473                                          * Backup, left and right edges were
10474                                          * ok to merge.
10475                                          */
10476                                         num_nr_gap_blocks--;
10477                                         nr_gap_descriptor--;
10478                                 }
10479                                 if (nr_selector->num_entries == 0)
10480                                         mergeable = 0;
10481                                 else {
10482                                         for (j = jstart; j < nr_selector->num_entries; j++) {
10483                                                 if (mergeable && nr_selector->right_edge) {
10484                                                         /*
10485                                                          * do a merge by NOT
10486                                                          * setting the left
10487                                                          * side
10488                                                          */
10489                                                         mergeable = 0;
10490                                                 } else {
10491                                                         /*
10492                                                          * no merge, set the
10493                                                          * left side
10494                                                          */
10495                                                         mergeable = 0;
10496                                                         nr_gap_descriptor->start = htons((nr_selector->gaps[j].start + offset));
10497                                                 }
10498                                                 nr_gap_descriptor->end = htons((nr_selector->gaps[j].end + offset));
10499                                                 num_nr_gap_blocks++;
10500                                                 nr_gap_descriptor++;
10501                                                 if (((caddr_t)nr_gap_descriptor + sizeof(struct sctp_nr_gap_ack_block)) > limit) {
10502                                                         /* no more room */
10503                                                         limit_reached = 1;
10504                                                         break;
10505                                                 }
10506                                         }
10507                                         if (nr_selector->left_edge) {
10508                                                 mergeable = 1;
10509                                         }
10510                                 }
10511                                 if (limit_reached) {
10512                                         /* Reached the limit stop */
10513                                         break;
10514                                 }
10515                                 jstart = 0;
10516                                 offset += 8;
10517                         }
10518                 }
10519         }
10520         /*---------------------------------------------End of---filling the nr_gap_ack blocks----------------------------------------------------*/
10521
10522         /* now we must add any dups we are going to report. */
10523         if ((limit_reached == 0) && (asoc->numduptsns)) {
10524                 dup = (uint32_t *) nr_gap_descriptor;
10525                 for (i = 0; i < asoc->numduptsns; i++) {
10526                         *dup = htonl(asoc->dup_tsns[i]);
10527                         dup++;
10528                         num_dups++;
10529                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10530                                 /* no more room */
10531                                 break;
10532                         }
10533                 }
10534                 asoc->numduptsns = 0;
10535         }
10536         /*
10537          * now that the chunk is prepared queue it to the control chunk
10538          * queue.
10539          */
10540         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
10541                 num_nr_gap_blocks = num_gap_blocks;
10542                 num_gap_blocks = 0;
10543         }
10544         a_chk->send_size = (sizeof(struct sctp_nr_sack_chunk) +
10545             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10546             (num_nr_gap_blocks * sizeof(struct sctp_nr_gap_ack_block)) +
10547             (num_dups * sizeof(int32_t)));
10548
10549         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10550         nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10551         nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10552         nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10553         nr_sack->nr_sack.reserved = htons(reserved);
10554         nr_sack->ch.chunk_length = htons(a_chk->send_size);
10555         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10556         asoc->ctrl_queue_cnt++;
10557         asoc->send_sack = 0;
10558         SCTP_STAT_INCR(sctps_sendsacks);
10559         return;
10560 }
10561
10562 void
10563 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10564 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10565     SCTP_UNUSED
10566 #endif
10567 )
10568 {
10569         struct mbuf *m_abort;
10570         struct mbuf *m_out = NULL, *m_end = NULL;
10571         struct sctp_abort_chunk *abort = NULL;
10572         int sz;
10573         uint32_t auth_offset = 0;
10574         struct sctp_auth_chunk *auth = NULL;
10575
10576         /*-
10577          * Add an AUTH chunk, if chunk requires it and save the offset into
10578          * the chain for AUTH
10579          */
10580         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10581             stcb->asoc.peer_auth_chunks)) {
10582                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10583                     stcb, SCTP_ABORT_ASSOCIATION);
10584                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10585         }
10586         SCTP_TCB_LOCK_ASSERT(stcb);
10587         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10588         if (m_abort == NULL) {
10589                 /* no mbuf's */
10590                 if (m_out)
10591                         sctp_m_freem(m_out);
10592                 return;
10593         }
10594         /* link in any error */
10595         SCTP_BUF_NEXT(m_abort) = operr;
10596         sz = 0;
10597         if (operr) {
10598                 struct mbuf *n;
10599
10600                 n = operr;
10601                 while (n) {
10602                         sz += SCTP_BUF_LEN(n);
10603                         n = SCTP_BUF_NEXT(n);
10604                 }
10605         }
10606         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10607         if (m_out == NULL) {
10608                 /* NO Auth chunk prepended, so reserve space in front */
10609                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10610                 m_out = m_abort;
10611         } else {
10612                 /* Put AUTH chunk at the front of the chain */
10613                 SCTP_BUF_NEXT(m_end) = m_abort;
10614         }
10615
10616         /* fill in the ABORT chunk */
10617         abort = mtod(m_abort, struct sctp_abort_chunk *);
10618         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10619         abort->ch.chunk_flags = 0;
10620         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10621
10622         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10623             stcb->asoc.primary_destination,
10624             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10625             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10626             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10627             stcb->asoc.primary_destination->port, so_locked, NULL);
10628         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10629 }
10630
10631 void
10632 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10633     struct sctp_nets *net)
10634 {
10635         /* formulate and SEND a SHUTDOWN-COMPLETE */
10636         struct mbuf *m_shutdown_comp;
10637         struct sctp_shutdown_complete_chunk *shutdown_complete;
10638
10639         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10640         if (m_shutdown_comp == NULL) {
10641                 /* no mbuf's */
10642                 return;
10643         }
10644         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10645         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10646         shutdown_complete->ch.chunk_flags = 0;
10647         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10648         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10649         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10650             (struct sockaddr *)&net->ro._l_addr,
10651             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10652             stcb->sctp_ep->sctp_lport, stcb->rport,
10653             htonl(stcb->asoc.peer_vtag),
10654             net->port, SCTP_SO_NOT_LOCKED, NULL);
10655         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10656         return;
10657 }
10658
10659 void
10660 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10661     uint32_t vrf_id, uint16_t port)
10662 {
10663         /* formulate and SEND a SHUTDOWN-COMPLETE */
10664         struct mbuf *o_pak;
10665         struct mbuf *mout;
10666         struct ip *iph, *iph_out;
10667         struct udphdr *udp = NULL;
10668
10669 #ifdef INET6
10670         struct ip6_hdr *ip6, *ip6_out;
10671
10672 #endif
10673         int offset_out, len, mlen;
10674         struct sctp_shutdown_complete_msg *comp_cp;
10675
10676         iph = mtod(m, struct ip *);
10677         switch (iph->ip_v) {
10678         case IPVERSION:
10679                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10680                 break;
10681 #ifdef INET6
10682         case IPV6_VERSION >> 4:
10683                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10684                 break;
10685 #endif
10686         default:
10687                 return;
10688         }
10689         if (port) {
10690                 len += sizeof(struct udphdr);
10691         }
10692         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10693         if (mout == NULL) {
10694                 return;
10695         }
10696         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10697         SCTP_BUF_LEN(mout) = len;
10698         SCTP_BUF_NEXT(mout) = NULL;
10699         iph_out = NULL;
10700 #ifdef INET6
10701         ip6_out = NULL;
10702 #endif
10703         offset_out = 0;
10704
10705         switch (iph->ip_v) {
10706         case IPVERSION:
10707                 iph_out = mtod(mout, struct ip *);
10708
10709                 /* Fill in the IP header for the ABORT */
10710                 iph_out->ip_v = IPVERSION;
10711                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10712                 iph_out->ip_tos = (u_char)0;
10713                 iph_out->ip_id = 0;
10714                 iph_out->ip_off = 0;
10715                 iph_out->ip_ttl = MAXTTL;
10716                 if (port) {
10717                         iph_out->ip_p = IPPROTO_UDP;
10718                 } else {
10719                         iph_out->ip_p = IPPROTO_SCTP;
10720                 }
10721                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10722                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10723
10724                 /* let IP layer calculate this */
10725                 iph_out->ip_sum = 0;
10726                 offset_out += sizeof(*iph_out);
10727                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10728                     (caddr_t)iph_out + offset_out);
10729                 break;
10730 #ifdef INET6
10731         case IPV6_VERSION >> 4:
10732                 ip6 = (struct ip6_hdr *)iph;
10733                 ip6_out = mtod(mout, struct ip6_hdr *);
10734
10735                 /* Fill in the IPv6 header for the ABORT */
10736                 ip6_out->ip6_flow = ip6->ip6_flow;
10737                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10738                 if (port) {
10739                         ip6_out->ip6_nxt = IPPROTO_UDP;
10740                 } else {
10741                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10742                 }
10743                 ip6_out->ip6_src = ip6->ip6_dst;
10744                 ip6_out->ip6_dst = ip6->ip6_src;
10745                 /*
10746                  * ?? The old code had both the iph len + payload, I think
10747                  * this is wrong and would never have worked
10748                  */
10749                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10750                 offset_out += sizeof(*ip6_out);
10751                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10752                     (caddr_t)ip6_out + offset_out);
10753                 break;
10754 #endif                          /* INET6 */
10755         default:
10756                 /* Currently not supported. */
10757                 sctp_m_freem(mout);
10758                 return;
10759         }
10760         if (port) {
10761                 udp = (struct udphdr *)comp_cp;
10762                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10763                 udp->uh_dport = port;
10764                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10765                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10766                 offset_out += sizeof(struct udphdr);
10767                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10768         }
10769         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10770                 /* no mbuf's */
10771                 sctp_m_freem(mout);
10772                 return;
10773         }
10774         /* Now copy in and fill in the ABORT tags etc. */
10775         comp_cp->sh.src_port = sh->dest_port;
10776         comp_cp->sh.dest_port = sh->src_port;
10777         comp_cp->sh.checksum = 0;
10778         comp_cp->sh.v_tag = sh->v_tag;
10779         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10780         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10781         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10782
10783         if (iph_out != NULL) {
10784                 sctp_route_t ro;
10785                 int ret;
10786                 struct sctp_tcb *stcb = NULL;
10787
10788                 mlen = SCTP_BUF_LEN(mout);
10789                 bzero(&ro, sizeof ro);
10790                 /* set IPv4 length */
10791                 iph_out->ip_len = mlen;
10792 #ifdef  SCTP_PACKET_LOGGING
10793                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10794                         sctp_packet_log(mout, mlen);
10795 #endif
10796                 if (port) {
10797                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10798                         SCTP_STAT_INCR(sctps_sendswcrc);
10799                         SCTP_ENABLE_UDP_CSUM(mout);
10800                 } else {
10801                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10802                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
10803                         SCTP_STAT_INCR(sctps_sendhwcrc);
10804                 }
10805                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10806                 /* out it goes */
10807                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10808
10809                 /* Free the route if we got one back */
10810                 if (ro.ro_rt)
10811                         RTFREE(ro.ro_rt);
10812         }
10813 #ifdef INET6
10814         if (ip6_out != NULL) {
10815                 struct route_in6 ro;
10816                 int ret;
10817                 struct sctp_tcb *stcb = NULL;
10818                 struct ifnet *ifp = NULL;
10819
10820                 bzero(&ro, sizeof(ro));
10821                 mlen = SCTP_BUF_LEN(mout);
10822 #ifdef  SCTP_PACKET_LOGGING
10823                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10824                         sctp_packet_log(mout, mlen);
10825 #endif
10826                 comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10827                 SCTP_STAT_INCR(sctps_sendswcrc);
10828                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10829                 if (port) {
10830                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10831                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10832                                 udp->uh_sum = 0xffff;
10833                         }
10834                 }
10835                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10836
10837                 /* Free the route if we got one back */
10838                 if (ro.ro_rt)
10839                         RTFREE(ro.ro_rt);
10840         }
10841 #endif
10842         SCTP_STAT_INCR(sctps_sendpackets);
10843         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10844         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10845         return;
10846
10847 }
10848
10849 static struct sctp_nets *
10850 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10851 {
10852         struct sctp_nets *net, *hnet;
10853         int ms_goneby, highest_ms, state_overide = 0;
10854
10855         (void)SCTP_GETTIME_TIMEVAL(now);
10856         highest_ms = 0;
10857         hnet = NULL;
10858         SCTP_TCB_LOCK_ASSERT(stcb);
10859         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10860                 if (
10861                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10862                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10863                     ) {
10864                         /*
10865                          * Skip this guy from consideration if HB is off AND
10866                          * its confirmed
10867                          */
10868                         continue;
10869                 }
10870                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10871                         /* skip this dest net from consideration */
10872                         continue;
10873                 }
10874                 if (net->last_sent_time.tv_sec) {
10875                         /* Sent to so we subtract */
10876                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10877                 } else
10878                         /* Never been sent to */
10879                         ms_goneby = 0x7fffffff;
10880                 /*-
10881                  * When the address state is unconfirmed but still
10882                  * considered reachable, we HB at a higher rate. Once it
10883                  * goes confirmed OR reaches the "unreachable" state, thenw
10884                  * we cut it back to HB at a more normal pace.
10885                  */
10886                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10887                         state_overide = 1;
10888                 } else {
10889                         state_overide = 0;
10890                 }
10891
10892                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10893                     (ms_goneby > highest_ms)) {
10894                         highest_ms = ms_goneby;
10895                         hnet = net;
10896                 }
10897         }
10898         if (hnet &&
10899             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10900                 state_overide = 1;
10901         } else {
10902                 state_overide = 0;
10903         }
10904
10905         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10906                 /*-
10907                  * Found the one with longest delay bounds OR it is
10908                  * unconfirmed and still not marked unreachable.
10909                  */
10910                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10911 #ifdef SCTP_DEBUG
10912                 if (hnet) {
10913                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10914                             (struct sockaddr *)&hnet->ro._l_addr);
10915                 } else {
10916                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10917                 }
10918 #endif
10919                 /* update the timer now */
10920                 hnet->last_sent_time = *now;
10921                 return (hnet);
10922         }
10923         /* Nothing to HB */
10924         return (NULL);
10925 }
10926
10927 int
10928 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10929 {
10930         struct sctp_tmit_chunk *chk;
10931         struct sctp_nets *net;
10932         struct sctp_heartbeat_chunk *hb;
10933         struct timeval now;
10934         struct sockaddr_in *sin;
10935         struct sockaddr_in6 *sin6;
10936
10937         SCTP_TCB_LOCK_ASSERT(stcb);
10938         if (user_req == 0) {
10939                 net = sctp_select_hb_destination(stcb, &now);
10940                 if (net == NULL) {
10941                         /*-
10942                          * All our busy none to send to, just start the
10943                          * timer again.
10944                          */
10945                         if (stcb->asoc.state == 0) {
10946                                 return (0);
10947                         }
10948                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10949                             stcb->sctp_ep,
10950                             stcb,
10951                             net);
10952                         return (0);
10953                 }
10954         } else {
10955                 net = u_net;
10956                 if (net == NULL) {
10957                         return (0);
10958                 }
10959                 (void)SCTP_GETTIME_TIMEVAL(&now);
10960         }
10961         sin = (struct sockaddr_in *)&net->ro._l_addr;
10962         if (sin->sin_family != AF_INET) {
10963                 if (sin->sin_family != AF_INET6) {
10964                         /* huh */
10965                         return (0);
10966                 }
10967         }
10968         sctp_alloc_a_chunk(stcb, chk);
10969         if (chk == NULL) {
10970                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10971                 return (0);
10972         }
10973         chk->copy_by_ref = 0;
10974         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10975         chk->rec.chunk_id.can_take_data = 1;
10976         chk->asoc = &stcb->asoc;
10977         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10978
10979         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10980         if (chk->data == NULL) {
10981                 sctp_free_a_chunk(stcb, chk);
10982                 return (0);
10983         }
10984         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10985         SCTP_BUF_LEN(chk->data) = chk->send_size;
10986         chk->sent = SCTP_DATAGRAM_UNSENT;
10987         chk->snd_count = 0;
10988         chk->whoTo = net;
10989         atomic_add_int(&chk->whoTo->ref_count, 1);
10990         /* Now we have a mbuf that we can fill in with the details */
10991         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10992         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10993         /* fill out chunk header */
10994         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10995         hb->ch.chunk_flags = 0;
10996         hb->ch.chunk_length = htons(chk->send_size);
10997         /* Fill out hb parameter */
10998         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10999         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11000         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11001         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11002         /* Did our user request this one, put it in */
11003         hb->heartbeat.hb_info.user_req = user_req;
11004         hb->heartbeat.hb_info.addr_family = sin->sin_family;
11005         hb->heartbeat.hb_info.addr_len = sin->sin_len;
11006         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11007                 /*
11008                  * we only take from the entropy pool if the address is not
11009                  * confirmed.
11010                  */
11011                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11012                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11013         } else {
11014                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11015                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11016         }
11017         if (sin->sin_family == AF_INET) {
11018                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
11019         } else if (sin->sin_family == AF_INET6) {
11020                 /* We leave the scope the way it is in our lookup table. */
11021                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
11022                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
11023         } else {
11024                 /* huh compiler bug */
11025                 return (0);
11026         }
11027
11028         /*
11029          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
11030          * PF-heartbeats.  Because of this, threshold management is done by
11031          * the t3 timer handler, and does not need to be done upon the send
11032          * of a PF-heartbeat. If CMT PF is on and the destination to which a
11033          * heartbeat is being sent is in PF state, do NOT do threshold
11034          * management.
11035          */
11036         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
11037                 /* ok we have a destination that needs a beat */
11038                 /* lets do the theshold management Qiaobing style */
11039                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
11040                     stcb->asoc.max_send_times)) {
11041                         /*-
11042                          * we have lost the association, in a way this is
11043                          * quite bad since we really are one less time since
11044                          * we really did not send yet. This is the down side
11045                          * to the Q's style as defined in the RFC and not my
11046                          * alternate style defined in the RFC.
11047                          */
11048                         if (chk->data != NULL) {
11049                                 sctp_m_freem(chk->data);
11050                                 chk->data = NULL;
11051                         }
11052                         /*
11053                          * Here we do NOT use the macro since the
11054                          * association is now gone.
11055                          */
11056                         if (chk->whoTo) {
11057                                 sctp_free_remote_addr(chk->whoTo);
11058                                 chk->whoTo = NULL;
11059                         }
11060                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
11061                         return (-1);
11062                 }
11063         }
11064         net->hb_responded = 0;
11065         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11066         stcb->asoc.ctrl_queue_cnt++;
11067         SCTP_STAT_INCR(sctps_sendheartbeat);
11068         /*-
11069          * Call directly med level routine to put out the chunk. It will
11070          * always tumble out control chunks aka HB but it may even tumble
11071          * out data too.
11072          */
11073         return (1);
11074 }
11075
11076 void
11077 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11078     uint32_t high_tsn)
11079 {
11080         struct sctp_association *asoc;
11081         struct sctp_ecne_chunk *ecne;
11082         struct sctp_tmit_chunk *chk;
11083
11084         asoc = &stcb->asoc;
11085         SCTP_TCB_LOCK_ASSERT(stcb);
11086         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11087                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
11088                         /* found a previous ECN_ECHO update it if needed */
11089                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11090                         ecne->tsn = htonl(high_tsn);
11091                         return;
11092                 }
11093         }
11094         /* nope could not find one to update so we must build one */
11095         sctp_alloc_a_chunk(stcb, chk);
11096         if (chk == NULL) {
11097                 return;
11098         }
11099         chk->copy_by_ref = 0;
11100         SCTP_STAT_INCR(sctps_sendecne);
11101         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11102         chk->rec.chunk_id.can_take_data = 0;
11103         chk->asoc = &stcb->asoc;
11104         chk->send_size = sizeof(struct sctp_ecne_chunk);
11105         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11106         if (chk->data == NULL) {
11107                 sctp_free_a_chunk(stcb, chk);
11108                 return;
11109         }
11110         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11111         SCTP_BUF_LEN(chk->data) = chk->send_size;
11112         chk->sent = SCTP_DATAGRAM_UNSENT;
11113         chk->snd_count = 0;
11114         chk->whoTo = net;
11115         atomic_add_int(&chk->whoTo->ref_count, 1);
11116         stcb->asoc.ecn_echo_cnt_onq++;
11117         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11118         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11119         ecne->ch.chunk_flags = 0;
11120         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11121         ecne->tsn = htonl(high_tsn);
11122         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11123         asoc->ctrl_queue_cnt++;
11124 }
11125
11126 void
11127 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11128     struct mbuf *m, int iphlen, int bad_crc)
11129 {
11130         struct sctp_association *asoc;
11131         struct sctp_pktdrop_chunk *drp;
11132         struct sctp_tmit_chunk *chk;
11133         uint8_t *datap;
11134         int len;
11135         int was_trunc = 0;
11136         struct ip *iph;
11137
11138 #ifdef INET6
11139         struct ip6_hdr *ip6h;
11140
11141 #endif
11142         int fullsz = 0, extra = 0;
11143         long spc;
11144         int offset;
11145         struct sctp_chunkhdr *ch, chunk_buf;
11146         unsigned int chk_length;
11147
11148         if (!stcb) {
11149                 return;
11150         }
11151         asoc = &stcb->asoc;
11152         SCTP_TCB_LOCK_ASSERT(stcb);
11153         if (asoc->peer_supports_pktdrop == 0) {
11154                 /*-
11155                  * peer must declare support before I send one.
11156                  */
11157                 return;
11158         }
11159         if (stcb->sctp_socket == NULL) {
11160                 return;
11161         }
11162         sctp_alloc_a_chunk(stcb, chk);
11163         if (chk == NULL) {
11164                 return;
11165         }
11166         chk->copy_by_ref = 0;
11167         iph = mtod(m, struct ip *);
11168         if (iph == NULL) {
11169                 sctp_free_a_chunk(stcb, chk);
11170                 return;
11171         }
11172         switch (iph->ip_v) {
11173         case IPVERSION:
11174                 /* IPv4 */
11175                 len = chk->send_size = iph->ip_len;
11176                 break;
11177 #ifdef INET6
11178         case IPV6_VERSION >> 4:
11179                 /* IPv6 */
11180                 ip6h = mtod(m, struct ip6_hdr *);
11181                 len = chk->send_size = htons(ip6h->ip6_plen);
11182                 break;
11183 #endif
11184         default:
11185                 return;
11186         }
11187         /* Validate that we do not have an ABORT in here. */
11188         offset = iphlen + sizeof(struct sctphdr);
11189         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11190             sizeof(*ch), (uint8_t *) & chunk_buf);
11191         while (ch != NULL) {
11192                 chk_length = ntohs(ch->chunk_length);
11193                 if (chk_length < sizeof(*ch)) {
11194                         /* break to abort land */
11195                         break;
11196                 }
11197                 switch (ch->chunk_type) {
11198                 case SCTP_PACKET_DROPPED:
11199                 case SCTP_ABORT_ASSOCIATION:
11200                         /*-
11201                          * we don't respond with an PKT-DROP to an ABORT
11202                          * or PKT-DROP
11203                          */
11204                         sctp_free_a_chunk(stcb, chk);
11205                         return;
11206                 default:
11207                         break;
11208                 }
11209                 offset += SCTP_SIZE32(chk_length);
11210                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11211                     sizeof(*ch), (uint8_t *) & chunk_buf);
11212         }
11213
11214         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11215             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11216                 /*
11217                  * only send 1 mtu worth, trim off the excess on the end.
11218                  */
11219                 fullsz = len - extra;
11220                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11221                 was_trunc = 1;
11222         }
11223         chk->asoc = &stcb->asoc;
11224         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11225         if (chk->data == NULL) {
11226 jump_out:
11227                 sctp_free_a_chunk(stcb, chk);
11228                 return;
11229         }
11230         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11231         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11232         if (drp == NULL) {
11233                 sctp_m_freem(chk->data);
11234                 chk->data = NULL;
11235                 goto jump_out;
11236         }
11237         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11238             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11239         chk->book_size_scale = 0;
11240         if (was_trunc) {
11241                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11242                 drp->trunc_len = htons(fullsz);
11243                 /*
11244                  * Len is already adjusted to size minus overhead above take
11245                  * out the pkt_drop chunk itself from it.
11246                  */
11247                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11248                 len = chk->send_size;
11249         } else {
11250                 /* no truncation needed */
11251                 drp->ch.chunk_flags = 0;
11252                 drp->trunc_len = htons(0);
11253         }
11254         if (bad_crc) {
11255                 drp->ch.chunk_flags |= SCTP_BADCRC;
11256         }
11257         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11258         SCTP_BUF_LEN(chk->data) = chk->send_size;
11259         chk->sent = SCTP_DATAGRAM_UNSENT;
11260         chk->snd_count = 0;
11261         if (net) {
11262                 /* we should hit here */
11263                 chk->whoTo = net;
11264         } else {
11265                 chk->whoTo = asoc->primary_destination;
11266         }
11267         atomic_add_int(&chk->whoTo->ref_count, 1);
11268         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11269         chk->rec.chunk_id.can_take_data = 1;
11270         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11271         drp->ch.chunk_length = htons(chk->send_size);
11272         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11273         if (spc < 0) {
11274                 spc = 0;
11275         }
11276         drp->bottle_bw = htonl(spc);
11277         if (asoc->my_rwnd) {
11278                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11279                     asoc->size_on_all_streams +
11280                     asoc->my_rwnd_control_len +
11281                     stcb->sctp_socket->so_rcv.sb_cc);
11282         } else {
11283                 /*-
11284                  * If my rwnd is 0, possibly from mbuf depletion as well as
11285                  * space used, tell the peer there is NO space aka onq == bw
11286                  */
11287                 drp->current_onq = htonl(spc);
11288         }
11289         drp->reserved = 0;
11290         datap = drp->data;
11291         m_copydata(m, iphlen, len, (caddr_t)datap);
11292         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11293         asoc->ctrl_queue_cnt++;
11294 }
11295
11296 void
11297 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
11298 {
11299         struct sctp_association *asoc;
11300         struct sctp_cwr_chunk *cwr;
11301         struct sctp_tmit_chunk *chk;
11302
11303         asoc = &stcb->asoc;
11304         SCTP_TCB_LOCK_ASSERT(stcb);
11305         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11306                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
11307                         /* found a previous ECN_CWR update it if needed */
11308                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11309                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
11310                             MAX_TSN)) {
11311                                 cwr->tsn = htonl(high_tsn);
11312                         }
11313                         return;
11314                 }
11315         }
11316         /* nope could not find one to update so we must build one */
11317         sctp_alloc_a_chunk(stcb, chk);
11318         if (chk == NULL) {
11319                 return;
11320         }
11321         chk->copy_by_ref = 0;
11322         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11323         chk->rec.chunk_id.can_take_data = 1;
11324         chk->asoc = &stcb->asoc;
11325         chk->send_size = sizeof(struct sctp_cwr_chunk);
11326         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11327         if (chk->data == NULL) {
11328                 sctp_free_a_chunk(stcb, chk);
11329                 return;
11330         }
11331         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11332         SCTP_BUF_LEN(chk->data) = chk->send_size;
11333         chk->sent = SCTP_DATAGRAM_UNSENT;
11334         chk->snd_count = 0;
11335         chk->whoTo = net;
11336         atomic_add_int(&chk->whoTo->ref_count, 1);
11337         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11338         cwr->ch.chunk_type = SCTP_ECN_CWR;
11339         cwr->ch.chunk_flags = 0;
11340         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11341         cwr->tsn = htonl(high_tsn);
11342         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11343         asoc->ctrl_queue_cnt++;
11344 }
11345
11346 void
11347 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11348     int number_entries, uint16_t * list,
11349     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11350 {
11351         int len, old_len, i;
11352         struct sctp_stream_reset_out_request *req_out;
11353         struct sctp_chunkhdr *ch;
11354
11355         ch = mtod(chk->data, struct sctp_chunkhdr *);
11356
11357
11358         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11359
11360         /* get to new offset for the param. */
11361         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11362         /* now how long will this param be? */
11363         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11364         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11365         req_out->ph.param_length = htons(len);
11366         req_out->request_seq = htonl(seq);
11367         req_out->response_seq = htonl(resp_seq);
11368         req_out->send_reset_at_tsn = htonl(last_sent);
11369         if (number_entries) {
11370                 for (i = 0; i < number_entries; i++) {
11371                         req_out->list_of_streams[i] = htons(list[i]);
11372                 }
11373         }
11374         if (SCTP_SIZE32(len) > len) {
11375                 /*-
11376                  * Need to worry about the pad we may end up adding to the
11377                  * end. This is easy since the struct is either aligned to 4
11378                  * bytes or 2 bytes off.
11379                  */
11380                 req_out->list_of_streams[number_entries] = 0;
11381         }
11382         /* now fix the chunk length */
11383         ch->chunk_length = htons(len + old_len);
11384         chk->book_size = len + old_len;
11385         chk->book_size_scale = 0;
11386         chk->send_size = SCTP_SIZE32(chk->book_size);
11387         SCTP_BUF_LEN(chk->data) = chk->send_size;
11388         return;
11389 }
11390
11391
11392 void
11393 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11394     int number_entries, uint16_t * list,
11395     uint32_t seq)
11396 {
11397         int len, old_len, i;
11398         struct sctp_stream_reset_in_request *req_in;
11399         struct sctp_chunkhdr *ch;
11400
11401         ch = mtod(chk->data, struct sctp_chunkhdr *);
11402
11403
11404         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11405
11406         /* get to new offset for the param. */
11407         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11408         /* now how long will this param be? */
11409         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11410         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11411         req_in->ph.param_length = htons(len);
11412         req_in->request_seq = htonl(seq);
11413         if (number_entries) {
11414                 for (i = 0; i < number_entries; i++) {
11415                         req_in->list_of_streams[i] = htons(list[i]);
11416                 }
11417         }
11418         if (SCTP_SIZE32(len) > len) {
11419                 /*-
11420                  * Need to worry about the pad we may end up adding to the
11421                  * end. This is easy since the struct is either aligned to 4
11422                  * bytes or 2 bytes off.
11423                  */
11424                 req_in->list_of_streams[number_entries] = 0;
11425         }
11426         /* now fix the chunk length */
11427         ch->chunk_length = htons(len + old_len);
11428         chk->book_size = len + old_len;
11429         chk->book_size_scale = 0;
11430         chk->send_size = SCTP_SIZE32(chk->book_size);
11431         SCTP_BUF_LEN(chk->data) = chk->send_size;
11432         return;
11433 }
11434
11435
11436 void
11437 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11438     uint32_t seq)
11439 {
11440         int len, old_len;
11441         struct sctp_stream_reset_tsn_request *req_tsn;
11442         struct sctp_chunkhdr *ch;
11443
11444         ch = mtod(chk->data, struct sctp_chunkhdr *);
11445
11446
11447         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11448
11449         /* get to new offset for the param. */
11450         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11451         /* now how long will this param be? */
11452         len = sizeof(struct sctp_stream_reset_tsn_request);
11453         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11454         req_tsn->ph.param_length = htons(len);
11455         req_tsn->request_seq = htonl(seq);
11456
11457         /* now fix the chunk length */
11458         ch->chunk_length = htons(len + old_len);
11459         chk->send_size = len + old_len;
11460         chk->book_size = SCTP_SIZE32(chk->send_size);
11461         chk->book_size_scale = 0;
11462         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11463         return;
11464 }
11465
11466 void
11467 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11468     uint32_t resp_seq, uint32_t result)
11469 {
11470         int len, old_len;
11471         struct sctp_stream_reset_response *resp;
11472         struct sctp_chunkhdr *ch;
11473
11474         ch = mtod(chk->data, struct sctp_chunkhdr *);
11475
11476
11477         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11478
11479         /* get to new offset for the param. */
11480         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11481         /* now how long will this param be? */
11482         len = sizeof(struct sctp_stream_reset_response);
11483         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11484         resp->ph.param_length = htons(len);
11485         resp->response_seq = htonl(resp_seq);
11486         resp->result = ntohl(result);
11487
11488         /* now fix the chunk length */
11489         ch->chunk_length = htons(len + old_len);
11490         chk->book_size = len + old_len;
11491         chk->book_size_scale = 0;
11492         chk->send_size = SCTP_SIZE32(chk->book_size);
11493         SCTP_BUF_LEN(chk->data) = chk->send_size;
11494         return;
11495
11496 }
11497
11498
11499 void
11500 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11501     uint32_t resp_seq, uint32_t result,
11502     uint32_t send_una, uint32_t recv_next)
11503 {
11504         int len, old_len;
11505         struct sctp_stream_reset_response_tsn *resp;
11506         struct sctp_chunkhdr *ch;
11507
11508         ch = mtod(chk->data, struct sctp_chunkhdr *);
11509
11510
11511         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11512
11513         /* get to new offset for the param. */
11514         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11515         /* now how long will this param be? */
11516         len = sizeof(struct sctp_stream_reset_response_tsn);
11517         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11518         resp->ph.param_length = htons(len);
11519         resp->response_seq = htonl(resp_seq);
11520         resp->result = htonl(result);
11521         resp->senders_next_tsn = htonl(send_una);
11522         resp->receivers_next_tsn = htonl(recv_next);
11523
11524         /* now fix the chunk length */
11525         ch->chunk_length = htons(len + old_len);
11526         chk->book_size = len + old_len;
11527         chk->send_size = SCTP_SIZE32(chk->book_size);
11528         chk->book_size_scale = 0;
11529         SCTP_BUF_LEN(chk->data) = chk->send_size;
11530         return;
11531 }
11532
11533 static void
11534 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11535     uint32_t seq,
11536     uint16_t adding)
11537 {
11538         int len, old_len;
11539         struct sctp_chunkhdr *ch;
11540         struct sctp_stream_reset_add_strm *addstr;
11541
11542         ch = mtod(chk->data, struct sctp_chunkhdr *);
11543         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11544
11545         /* get to new offset for the param. */
11546         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11547         /* now how long will this param be? */
11548         len = sizeof(struct sctp_stream_reset_add_strm);
11549
11550         /* Fill it out. */
11551         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11552         addstr->ph.param_length = htons(len);
11553         addstr->request_seq = htonl(seq);
11554         addstr->number_of_streams = htons(adding);
11555         addstr->reserved = 0;
11556
11557         /* now fix the chunk length */
11558         ch->chunk_length = htons(len + old_len);
11559         chk->send_size = len + old_len;
11560         chk->book_size = SCTP_SIZE32(chk->send_size);
11561         chk->book_size_scale = 0;
11562         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11563         return;
11564 }
11565
11566 int
11567 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11568     int number_entries, uint16_t * list,
11569     uint8_t send_out_req,
11570     uint32_t resp_seq,
11571     uint8_t send_in_req,
11572     uint8_t send_tsn_req,
11573     uint8_t add_stream,
11574     uint16_t adding
11575 )
11576 {
11577
11578         struct sctp_association *asoc;
11579         struct sctp_tmit_chunk *chk;
11580         struct sctp_chunkhdr *ch;
11581         uint32_t seq;
11582
11583         asoc = &stcb->asoc;
11584         if (asoc->stream_reset_outstanding) {
11585                 /*-
11586                  * Already one pending, must get ACK back to clear the flag.
11587                  */
11588                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11589                 return (EBUSY);
11590         }
11591         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11592             (add_stream == 0)) {
11593                 /* nothing to do */
11594                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11595                 return (EINVAL);
11596         }
11597         if (send_tsn_req && (send_out_req || send_in_req)) {
11598                 /* error, can't do that */
11599                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11600                 return (EINVAL);
11601         }
11602         sctp_alloc_a_chunk(stcb, chk);
11603         if (chk == NULL) {
11604                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11605                 return (ENOMEM);
11606         }
11607         chk->copy_by_ref = 0;
11608         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11609         chk->rec.chunk_id.can_take_data = 0;
11610         chk->asoc = &stcb->asoc;
11611         chk->book_size = sizeof(struct sctp_chunkhdr);
11612         chk->send_size = SCTP_SIZE32(chk->book_size);
11613         chk->book_size_scale = 0;
11614
11615         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11616         if (chk->data == NULL) {
11617                 sctp_free_a_chunk(stcb, chk);
11618                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11619                 return (ENOMEM);
11620         }
11621         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11622
11623         /* setup chunk parameters */
11624         chk->sent = SCTP_DATAGRAM_UNSENT;
11625         chk->snd_count = 0;
11626         chk->whoTo = asoc->primary_destination;
11627         atomic_add_int(&chk->whoTo->ref_count, 1);
11628
11629         ch = mtod(chk->data, struct sctp_chunkhdr *);
11630         ch->chunk_type = SCTP_STREAM_RESET;
11631         ch->chunk_flags = 0;
11632         ch->chunk_length = htons(chk->book_size);
11633         SCTP_BUF_LEN(chk->data) = chk->send_size;
11634
11635         seq = stcb->asoc.str_reset_seq_out;
11636         if (send_out_req) {
11637                 sctp_add_stream_reset_out(chk, number_entries, list,
11638                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11639                 asoc->stream_reset_out_is_outstanding = 1;
11640                 seq++;
11641                 asoc->stream_reset_outstanding++;
11642         }
11643         if (add_stream) {
11644                 sctp_add_a_stream(chk, seq, adding);
11645                 seq++;
11646                 asoc->stream_reset_outstanding++;
11647         }
11648         if (send_in_req) {
11649                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11650                 asoc->stream_reset_outstanding++;
11651         }
11652         if (send_tsn_req) {
11653                 sctp_add_stream_reset_tsn(chk, seq);
11654                 asoc->stream_reset_outstanding++;
11655         }
11656         asoc->str_reset = chk;
11657
11658         /* insert the chunk for sending */
11659         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11660             chk,
11661             sctp_next);
11662         asoc->ctrl_queue_cnt++;
11663         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11664         return (0);
11665 }
11666
11667 void
11668 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11669     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11670 {
11671         /*-
11672          * Formulate the abort message, and send it back down.
11673          */
11674         struct mbuf *o_pak;
11675         struct mbuf *mout;
11676         struct sctp_abort_msg *abm;
11677         struct ip *iph, *iph_out;
11678         struct udphdr *udp;
11679
11680 #ifdef INET6
11681         struct ip6_hdr *ip6, *ip6_out;
11682
11683 #endif
11684         int iphlen_out, len;
11685
11686         /* don't respond to ABORT with ABORT */
11687         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11688                 if (err_cause)
11689                         sctp_m_freem(err_cause);
11690                 return;
11691         }
11692         iph = mtod(m, struct ip *);
11693         switch (iph->ip_v) {
11694         case IPVERSION:
11695                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11696                 break;
11697 #ifdef INET6
11698         case IPV6_VERSION >> 4:
11699                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11700                 break;
11701 #endif
11702         default:
11703                 if (err_cause) {
11704                         sctp_m_freem(err_cause);
11705                 }
11706                 return;
11707         }
11708         if (port) {
11709                 len += sizeof(struct udphdr);
11710         }
11711         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11712         if (mout == NULL) {
11713                 if (err_cause) {
11714                         sctp_m_freem(err_cause);
11715                 }
11716                 return;
11717         }
11718         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11719         SCTP_BUF_LEN(mout) = len;
11720         SCTP_BUF_NEXT(mout) = err_cause;
11721         iph_out = NULL;
11722 #ifdef INET6
11723         ip6_out = NULL;
11724 #endif
11725         switch (iph->ip_v) {
11726         case IPVERSION:
11727                 iph_out = mtod(mout, struct ip *);
11728
11729                 /* Fill in the IP header for the ABORT */
11730                 iph_out->ip_v = IPVERSION;
11731                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11732                 iph_out->ip_tos = (u_char)0;
11733                 iph_out->ip_id = 0;
11734                 iph_out->ip_off = 0;
11735                 iph_out->ip_ttl = MAXTTL;
11736                 if (port) {
11737                         iph_out->ip_p = IPPROTO_UDP;
11738                 } else {
11739                         iph_out->ip_p = IPPROTO_SCTP;
11740                 }
11741                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11742                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11743                 /* let IP layer calculate this */
11744                 iph_out->ip_sum = 0;
11745
11746                 iphlen_out = sizeof(*iph_out);
11747                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11748                 break;
11749 #ifdef INET6
11750         case IPV6_VERSION >> 4:
11751                 ip6 = (struct ip6_hdr *)iph;
11752                 ip6_out = mtod(mout, struct ip6_hdr *);
11753
11754                 /* Fill in the IP6 header for the ABORT */
11755                 ip6_out->ip6_flow = ip6->ip6_flow;
11756                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11757                 if (port) {
11758                         ip6_out->ip6_nxt = IPPROTO_UDP;
11759                 } else {
11760                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11761                 }
11762                 ip6_out->ip6_src = ip6->ip6_dst;
11763                 ip6_out->ip6_dst = ip6->ip6_src;
11764
11765                 iphlen_out = sizeof(*ip6_out);
11766                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11767                 break;
11768 #endif                          /* INET6 */
11769         default:
11770                 /* Currently not supported */
11771                 sctp_m_freem(mout);
11772                 return;
11773         }
11774
11775         udp = (struct udphdr *)abm;
11776         if (port) {
11777                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11778                 udp->uh_dport = port;
11779                 /* set udp->uh_ulen later */
11780                 udp->uh_sum = 0;
11781                 iphlen_out += sizeof(struct udphdr);
11782                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11783         }
11784         abm->sh.src_port = sh->dest_port;
11785         abm->sh.dest_port = sh->src_port;
11786         abm->sh.checksum = 0;
11787         if (vtag == 0) {
11788                 abm->sh.v_tag = sh->v_tag;
11789                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11790         } else {
11791                 abm->sh.v_tag = htonl(vtag);
11792                 abm->msg.ch.chunk_flags = 0;
11793         }
11794         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11795
11796         if (err_cause) {
11797                 struct mbuf *m_tmp = err_cause;
11798                 int err_len = 0;
11799
11800                 /* get length of the err_cause chain */
11801                 while (m_tmp != NULL) {
11802                         err_len += SCTP_BUF_LEN(m_tmp);
11803                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11804                 }
11805                 len = SCTP_BUF_LEN(mout) + err_len;
11806                 if (err_len % 4) {
11807                         /* need pad at end of chunk */
11808                         uint32_t cpthis = 0;
11809                         int padlen;
11810
11811                         padlen = 4 - (len % 4);
11812                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11813                         len += padlen;
11814                 }
11815                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11816         } else {
11817                 len = SCTP_BUF_LEN(mout);
11818                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11819         }
11820
11821         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11822                 /* no mbuf's */
11823                 sctp_m_freem(mout);
11824                 return;
11825         }
11826         if (iph_out != NULL) {
11827                 sctp_route_t ro;
11828                 struct sctp_tcb *stcb = NULL;
11829                 int ret;
11830
11831                 /* zap the stack pointer to the route */
11832                 bzero(&ro, sizeof ro);
11833                 if (port) {
11834                         udp->uh_ulen = htons(len - sizeof(struct ip));
11835                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11836                 }
11837                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11838                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11839                 /* set IPv4 length */
11840                 iph_out->ip_len = len;
11841                 /* out it goes */
11842 #ifdef  SCTP_PACKET_LOGGING
11843                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11844                         sctp_packet_log(mout, len);
11845 #endif
11846                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11847                 if (port) {
11848                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11849                         SCTP_STAT_INCR(sctps_sendswcrc);
11850                         SCTP_ENABLE_UDP_CSUM(o_pak);
11851                 } else {
11852                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11853                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
11854                         SCTP_STAT_INCR(sctps_sendhwcrc);
11855                 }
11856                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11857
11858                 /* Free the route if we got one back */
11859                 if (ro.ro_rt)
11860                         RTFREE(ro.ro_rt);
11861         }
11862 #ifdef INET6
11863         if (ip6_out != NULL) {
11864                 struct route_in6 ro;
11865                 int ret;
11866                 struct sctp_tcb *stcb = NULL;
11867                 struct ifnet *ifp = NULL;
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 ip6_hdr));
11873                 }
11874                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11875                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11876                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11877 #ifdef  SCTP_PACKET_LOGGING
11878                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11879                         sctp_packet_log(mout, len);
11880 #endif
11881                 abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11882                 SCTP_STAT_INCR(sctps_sendswcrc);
11883                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11884                 if (port) {
11885                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11886                                 udp->uh_sum = 0xffff;
11887                         }
11888                 }
11889                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11890
11891                 /* Free the route if we got one back */
11892                 if (ro.ro_rt)
11893                         RTFREE(ro.ro_rt);
11894         }
11895 #endif
11896         SCTP_STAT_INCR(sctps_sendpackets);
11897         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11898         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11899 }
11900
11901 void
11902 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11903     uint32_t vrf_id, uint16_t port)
11904 {
11905         struct mbuf *o_pak;
11906         struct sctphdr *sh, *sh_out;
11907         struct sctp_chunkhdr *ch;
11908         struct ip *iph, *iph_out;
11909         struct udphdr *udp = NULL;
11910         struct mbuf *mout;
11911
11912 #ifdef INET6
11913         struct ip6_hdr *ip6, *ip6_out;
11914
11915 #endif
11916         int iphlen_out, len;
11917
11918         iph = mtod(m, struct ip *);
11919         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11920         switch (iph->ip_v) {
11921         case IPVERSION:
11922                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11923                 break;
11924 #ifdef INET6
11925         case IPV6_VERSION >> 4:
11926                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11927                 break;
11928 #endif
11929         default:
11930                 if (scm) {
11931                         sctp_m_freem(scm);
11932                 }
11933                 return;
11934         }
11935         if (port) {
11936                 len += sizeof(struct udphdr);
11937         }
11938         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11939         if (mout == NULL) {
11940                 if (scm) {
11941                         sctp_m_freem(scm);
11942                 }
11943                 return;
11944         }
11945         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11946         SCTP_BUF_LEN(mout) = len;
11947         SCTP_BUF_NEXT(mout) = scm;
11948         iph_out = NULL;
11949 #ifdef INET6
11950         ip6_out = NULL;
11951 #endif
11952         switch (iph->ip_v) {
11953         case IPVERSION:
11954                 iph_out = mtod(mout, struct ip *);
11955
11956                 /* Fill in the IP header for the ABORT */
11957                 iph_out->ip_v = IPVERSION;
11958                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11959                 iph_out->ip_tos = (u_char)0;
11960                 iph_out->ip_id = 0;
11961                 iph_out->ip_off = 0;
11962                 iph_out->ip_ttl = MAXTTL;
11963                 if (port) {
11964                         iph_out->ip_p = IPPROTO_UDP;
11965                 } else {
11966                         iph_out->ip_p = IPPROTO_SCTP;
11967                 }
11968                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11969                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11970                 /* let IP layer calculate this */
11971                 iph_out->ip_sum = 0;
11972
11973                 iphlen_out = sizeof(struct ip);
11974                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11975                 break;
11976 #ifdef INET6
11977         case IPV6_VERSION >> 4:
11978                 ip6 = (struct ip6_hdr *)iph;
11979                 ip6_out = mtod(mout, struct ip6_hdr *);
11980
11981                 /* Fill in the IP6 header for the ABORT */
11982                 ip6_out->ip6_flow = ip6->ip6_flow;
11983                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11984                 if (port) {
11985                         ip6_out->ip6_nxt = IPPROTO_UDP;
11986                 } else {
11987                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11988                 }
11989                 ip6_out->ip6_src = ip6->ip6_dst;
11990                 ip6_out->ip6_dst = ip6->ip6_src;
11991
11992                 iphlen_out = sizeof(struct ip6_hdr);
11993                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11994                 break;
11995 #endif                          /* INET6 */
11996         default:
11997                 /* Currently not supported */
11998                 sctp_m_freem(mout);
11999                 return;
12000         }
12001
12002         udp = (struct udphdr *)sh_out;
12003         if (port) {
12004                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12005                 udp->uh_dport = port;
12006                 /* set udp->uh_ulen later */
12007                 udp->uh_sum = 0;
12008                 iphlen_out += sizeof(struct udphdr);
12009                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12010         }
12011         sh_out->src_port = sh->dest_port;
12012         sh_out->dest_port = sh->src_port;
12013         sh_out->v_tag = vtag;
12014         sh_out->checksum = 0;
12015
12016         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12017         ch->chunk_type = SCTP_OPERATION_ERROR;
12018         ch->chunk_flags = 0;
12019
12020         if (scm) {
12021                 struct mbuf *m_tmp = scm;
12022                 int cause_len = 0;
12023
12024                 /* get length of the err_cause chain */
12025                 while (m_tmp != NULL) {
12026                         cause_len += SCTP_BUF_LEN(m_tmp);
12027                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12028                 }
12029                 len = SCTP_BUF_LEN(mout) + cause_len;
12030                 if (cause_len % 4) {
12031                         /* need pad at end of chunk */
12032                         uint32_t cpthis = 0;
12033                         int padlen;
12034
12035                         padlen = 4 - (len % 4);
12036                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12037                         len += padlen;
12038                 }
12039                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12040         } else {
12041                 len = SCTP_BUF_LEN(mout);
12042                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12043         }
12044
12045         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12046                 /* no mbuf's */
12047                 sctp_m_freem(mout);
12048                 return;
12049         }
12050         if (iph_out != NULL) {
12051                 sctp_route_t ro;
12052                 struct sctp_tcb *stcb = NULL;
12053                 int ret;
12054
12055                 /* zap the stack pointer to the route */
12056                 bzero(&ro, sizeof ro);
12057                 if (port) {
12058                         udp->uh_ulen = htons(len - sizeof(struct ip));
12059                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12060                 }
12061                 /* set IPv4 length */
12062                 iph_out->ip_len = len;
12063                 /* out it goes */
12064 #ifdef  SCTP_PACKET_LOGGING
12065                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12066                         sctp_packet_log(mout, len);
12067 #endif
12068                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12069                 if (port) {
12070                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12071                         SCTP_STAT_INCR(sctps_sendswcrc);
12072                         SCTP_ENABLE_UDP_CSUM(o_pak);
12073                 } else {
12074                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12075                         mout->m_pkthdr.csum_data = 0;   /* FIXME MT */
12076                         SCTP_STAT_INCR(sctps_sendhwcrc);
12077                 }
12078                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
12079
12080                 /* Free the route if we got one back */
12081                 if (ro.ro_rt)
12082                         RTFREE(ro.ro_rt);
12083         }
12084 #ifdef INET6
12085         if (ip6_out != NULL) {
12086                 struct route_in6 ro;
12087                 int ret;
12088                 struct sctp_tcb *stcb = NULL;
12089                 struct ifnet *ifp = NULL;
12090
12091                 /* zap the stack pointer to the route */
12092                 bzero(&ro, sizeof(ro));
12093                 if (port) {
12094                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12095                 }
12096                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12097 #ifdef  SCTP_PACKET_LOGGING
12098                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12099                         sctp_packet_log(mout, len);
12100 #endif
12101                 sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12102                 SCTP_STAT_INCR(sctps_sendswcrc);
12103                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12104                 if (port) {
12105                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12106                                 udp->uh_sum = 0xffff;
12107                         }
12108                 }
12109                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
12110
12111                 /* Free the route if we got one back */
12112                 if (ro.ro_rt)
12113                         RTFREE(ro.ro_rt);
12114         }
12115 #endif
12116         SCTP_STAT_INCR(sctps_sendpackets);
12117         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12118         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12119 }
12120
12121 static struct mbuf *
12122 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12123     struct uio *uio,
12124     struct sctp_sndrcvinfo *srcv,
12125     int max_send_len,
12126     int user_marks_eor,
12127     int *error,
12128     uint32_t * sndout,
12129     struct mbuf **new_tail)
12130 {
12131         struct mbuf *m;
12132
12133         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12134             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12135         if (m == NULL) {
12136                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12137                 *error = ENOMEM;
12138         } else {
12139                 *sndout = m_length(m, NULL);
12140                 *new_tail = m_last(m);
12141         }
12142         return (m);
12143 }
12144
12145 static int
12146 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12147     struct uio *uio,
12148     int resv_upfront)
12149 {
12150         int left;
12151
12152         left = sp->length;
12153         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12154             resv_upfront, 0);
12155         if (sp->data == NULL) {
12156                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12157                 return (ENOMEM);
12158         }
12159         sp->tail_mbuf = m_last(sp->data);
12160         return (0);
12161 }
12162
12163
12164
12165 static struct sctp_stream_queue_pending *
12166 sctp_copy_it_in(struct sctp_tcb *stcb,
12167     struct sctp_association *asoc,
12168     struct sctp_sndrcvinfo *srcv,
12169     struct uio *uio,
12170     struct sctp_nets *net,
12171     int max_send_len,
12172     int user_marks_eor,
12173     int *error,
12174     int non_blocking)
12175 {
12176         /*-
12177          * This routine must be very careful in its work. Protocol
12178          * processing is up and running so care must be taken to spl...()
12179          * when you need to do something that may effect the stcb/asoc. The
12180          * sb is locked however. When data is copied the protocol processing
12181          * should be enabled since this is a slower operation...
12182          */
12183         struct sctp_stream_queue_pending *sp = NULL;
12184         int resv_in_first;
12185
12186         *error = 0;
12187         /* Now can we send this? */
12188         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12189             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12190             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12191             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12192                 /* got data while shutting down */
12193                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12194                 *error = ECONNRESET;
12195                 goto out_now;
12196         }
12197         sctp_alloc_a_strmoq(stcb, sp);
12198         if (sp == NULL) {
12199                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12200                 *error = ENOMEM;
12201                 goto out_now;
12202         }
12203         sp->act_flags = 0;
12204         sp->sender_all_done = 0;
12205         sp->sinfo_flags = srcv->sinfo_flags;
12206         sp->timetolive = srcv->sinfo_timetolive;
12207         sp->ppid = srcv->sinfo_ppid;
12208         sp->context = srcv->sinfo_context;
12209         sp->strseq = 0;
12210         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12211
12212         sp->stream = srcv->sinfo_stream;
12213         sp->length = min(uio->uio_resid, max_send_len);
12214         if ((sp->length == (uint32_t) uio->uio_resid) &&
12215             ((user_marks_eor == 0) ||
12216             (srcv->sinfo_flags & SCTP_EOF) ||
12217             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12218                 sp->msg_is_complete = 1;
12219         } else {
12220                 sp->msg_is_complete = 0;
12221         }
12222         sp->sender_all_done = 0;
12223         sp->some_taken = 0;
12224         sp->put_last_out = 0;
12225         resv_in_first = sizeof(struct sctp_data_chunk);
12226         sp->data = sp->tail_mbuf = NULL;
12227         if (sp->length == 0) {
12228                 *error = 0;
12229                 goto skip_copy;
12230         }
12231         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12232         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12233                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
12234                 sp->holds_key_ref = 1;
12235         }
12236         *error = sctp_copy_one(sp, uio, resv_in_first);
12237 skip_copy:
12238         if (*error) {
12239                 sctp_free_a_strmoq(stcb, sp);
12240                 sp = NULL;
12241         } else {
12242                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12243                         sp->net = net;
12244                 } else {
12245                         sp->net = asoc->primary_destination;
12246                 }
12247                 atomic_add_int(&sp->net->ref_count, 1);
12248                 sctp_set_prsctp_policy(sp);
12249         }
12250 out_now:
12251         return (sp);
12252 }
12253
12254
12255 int
12256 sctp_sosend(struct socket *so,
12257     struct sockaddr *addr,
12258     struct uio *uio,
12259     struct mbuf *top,
12260     struct mbuf *control,
12261     int flags,
12262     struct thread *p
12263 )
12264 {
12265         struct sctp_inpcb *inp;
12266         int error, use_rcvinfo = 0;
12267         struct sctp_sndrcvinfo srcv;
12268         struct sockaddr *addr_to_use;
12269
12270 #ifdef INET6
12271         struct sockaddr_in sin;
12272
12273 #endif
12274
12275         inp = (struct sctp_inpcb *)so->so_pcb;
12276         if (control) {
12277                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12278                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12279                     sizeof(srcv))) {
12280                         /* got one */
12281                         use_rcvinfo = 1;
12282                 }
12283         }
12284         addr_to_use = addr;
12285 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
12286         if ((addr) && (addr->sa_family == AF_INET6)) {
12287                 struct sockaddr_in6 *sin6;
12288
12289                 sin6 = (struct sockaddr_in6 *)addr;
12290                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12291                         in6_sin6_2_sin(&sin, sin6);
12292                         addr_to_use = (struct sockaddr *)&sin;
12293                 }
12294         }
12295 #endif
12296         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12297             control,
12298             flags,
12299             use_rcvinfo, &srcv
12300             ,p
12301             );
12302         return (error);
12303 }
12304
12305
12306 int
12307 sctp_lower_sosend(struct socket *so,
12308     struct sockaddr *addr,
12309     struct uio *uio,
12310     struct mbuf *i_pak,
12311     struct mbuf *control,
12312     int flags,
12313     int use_rcvinfo,
12314     struct sctp_sndrcvinfo *srcv
12315     ,
12316     struct thread *p
12317 )
12318 {
12319         unsigned int sndlen = 0, max_len;
12320         int error, len;
12321         struct mbuf *top = NULL;
12322         int queue_only = 0, queue_only_for_init = 0;
12323         int free_cnt_applied = 0;
12324         int un_sent = 0;
12325         int now_filled = 0;
12326         unsigned int inqueue_bytes = 0;
12327         struct sctp_block_entry be;
12328         struct sctp_inpcb *inp;
12329         struct sctp_tcb *stcb = NULL;
12330         struct timeval now;
12331         struct sctp_nets *net;
12332         struct sctp_association *asoc;
12333         struct sctp_inpcb *t_inp;
12334         int user_marks_eor;
12335         int create_lock_applied = 0;
12336         int nagle_applies = 0;
12337         int some_on_control = 0;
12338         int got_all_of_the_send = 0;
12339         int hold_tcblock = 0;
12340         int non_blocking = 0;
12341         int temp_flags = 0;
12342         uint32_t local_add_more, local_soresv = 0;
12343
12344         error = 0;
12345         net = NULL;
12346         stcb = NULL;
12347         asoc = NULL;
12348
12349         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12350         if (inp == NULL) {
12351                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12352                 error = EINVAL;
12353                 if (i_pak) {
12354                         SCTP_RELEASE_PKT(i_pak);
12355                 }
12356                 return (error);
12357         }
12358         if ((uio == NULL) && (i_pak == NULL)) {
12359                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12360                 return (EINVAL);
12361         }
12362         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12363         atomic_add_int(&inp->total_sends, 1);
12364         if (uio) {
12365                 if (uio->uio_resid < 0) {
12366                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12367                         return (EINVAL);
12368                 }
12369                 sndlen = uio->uio_resid;
12370         } else {
12371                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12372                 sndlen = SCTP_HEADER_LEN(i_pak);
12373         }
12374         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12375             addr,
12376             sndlen);
12377         /*-
12378          * Pre-screen address, if one is given the sin-len
12379          * must be set correctly!
12380          */
12381         if (addr) {
12382                 if ((addr->sa_family == AF_INET) &&
12383                     (addr->sa_len != sizeof(struct sockaddr_in))) {
12384                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12385                         error = EINVAL;
12386                         goto out_unlocked;
12387                 } else if ((addr->sa_family == AF_INET6) &&
12388                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
12389                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12390                         error = EINVAL;
12391                         goto out_unlocked;
12392                 }
12393         }
12394         hold_tcblock = 0;
12395
12396         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12397             (inp->sctp_socket->so_qlimit)) {
12398                 /* The listener can NOT send */
12399                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12400                 error = ENOTCONN;
12401                 goto out_unlocked;
12402         }
12403         if ((use_rcvinfo) && srcv) {
12404                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
12405                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
12406                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12407                         error = EINVAL;
12408                         goto out_unlocked;
12409                 }
12410                 if (srcv->sinfo_flags)
12411                         SCTP_STAT_INCR(sctps_sends_with_flags);
12412
12413                 if (srcv->sinfo_flags & SCTP_SENDALL) {
12414                         /* its a sendall */
12415                         error = sctp_sendall(inp, uio, top, srcv);
12416                         top = NULL;
12417                         goto out_unlocked;
12418                 }
12419         }
12420         /* now we must find the assoc */
12421         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12422             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12423                 SCTP_INP_RLOCK(inp);
12424                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12425                 if (stcb == NULL) {
12426                         SCTP_INP_RUNLOCK(inp);
12427                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12428                         error = ENOTCONN;
12429                         goto out_unlocked;
12430                 }
12431                 SCTP_TCB_LOCK(stcb);
12432                 hold_tcblock = 1;
12433                 SCTP_INP_RUNLOCK(inp);
12434                 if (addr) {
12435                         /* Must locate the net structure if addr given */
12436                         net = sctp_findnet(stcb, addr);
12437                         if (net) {
12438                                 /* validate port was 0 or correct */
12439                                 struct sockaddr_in *sin;
12440
12441                                 sin = (struct sockaddr_in *)addr;
12442                                 if ((sin->sin_port != 0) &&
12443                                     (sin->sin_port != stcb->rport)) {
12444                                         net = NULL;
12445                                 }
12446                         }
12447                         temp_flags |= SCTP_ADDR_OVER;
12448                 } else
12449                         net = stcb->asoc.primary_destination;
12450                 if (addr && (net == NULL)) {
12451                         /* Could not find address, was it legal */
12452                         if (addr->sa_family == AF_INET) {
12453                                 struct sockaddr_in *sin;
12454
12455                                 sin = (struct sockaddr_in *)addr;
12456                                 if (sin->sin_addr.s_addr == 0) {
12457                                         if ((sin->sin_port == 0) ||
12458                                             (sin->sin_port == stcb->rport)) {
12459                                                 net = stcb->asoc.primary_destination;
12460                                         }
12461                                 }
12462                         } else {
12463                                 struct sockaddr_in6 *sin6;
12464
12465                                 sin6 = (struct sockaddr_in6 *)addr;
12466                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
12467                                         if ((sin6->sin6_port == 0) ||
12468                                             (sin6->sin6_port == stcb->rport)) {
12469                                                 net = stcb->asoc.primary_destination;
12470                                         }
12471                                 }
12472                         }
12473                 }
12474                 if (net == NULL) {
12475                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12476                         error = EINVAL;
12477                         goto out_unlocked;
12478                 }
12479         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
12480                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
12481                 if (stcb) {
12482                         if (addr)
12483                                 /*
12484                                  * Must locate the net structure if addr
12485                                  * given
12486                                  */
12487                                 net = sctp_findnet(stcb, addr);
12488                         else
12489                                 net = stcb->asoc.primary_destination;
12490                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
12491                             ((net == NULL) || (addr == NULL))) {
12492                                 struct sockaddr_in *sin;
12493
12494                                 if (addr == NULL) {
12495                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12496                                         error = EINVAL;
12497                                         goto out_unlocked;
12498                                 }
12499                                 sin = (struct sockaddr_in *)addr;
12500                                 /* Validate port is 0 or correct */
12501                                 if ((sin->sin_port != 0) &&
12502                                     (sin->sin_port != stcb->rport)) {
12503                                         net = NULL;
12504                                 }
12505                         }
12506                 }
12507                 hold_tcblock = 0;
12508         } else if (addr) {
12509                 /*-
12510                  * Since we did not use findep we must
12511                  * increment it, and if we don't find a tcb
12512                  * decrement it.
12513                  */
12514                 SCTP_INP_WLOCK(inp);
12515                 SCTP_INP_INCR_REF(inp);
12516                 SCTP_INP_WUNLOCK(inp);
12517                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12518                 if (stcb == NULL) {
12519                         SCTP_INP_WLOCK(inp);
12520                         SCTP_INP_DECR_REF(inp);
12521                         SCTP_INP_WUNLOCK(inp);
12522                 } else {
12523                         hold_tcblock = 1;
12524                 }
12525         }
12526         if ((stcb == NULL) && (addr)) {
12527                 /* Possible implicit send? */
12528                 SCTP_ASOC_CREATE_LOCK(inp);
12529                 create_lock_applied = 1;
12530                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12531                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12532                         /* Should I really unlock ? */
12533                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12534                         error = EINVAL;
12535                         goto out_unlocked;
12536
12537                 }
12538                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12539                     (addr->sa_family == AF_INET6)) {
12540                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12541                         error = EINVAL;
12542                         goto out_unlocked;
12543                 }
12544                 SCTP_INP_WLOCK(inp);
12545                 SCTP_INP_INCR_REF(inp);
12546                 SCTP_INP_WUNLOCK(inp);
12547                 /* With the lock applied look again */
12548                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12549                 if (stcb == NULL) {
12550                         SCTP_INP_WLOCK(inp);
12551                         SCTP_INP_DECR_REF(inp);
12552                         SCTP_INP_WUNLOCK(inp);
12553                 } else {
12554                         hold_tcblock = 1;
12555                 }
12556                 if (t_inp != inp) {
12557                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12558                         error = ENOTCONN;
12559                         goto out_unlocked;
12560                 }
12561         }
12562         if (stcb == NULL) {
12563                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12564                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12565                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12566                         error = ENOTCONN;
12567                         goto out_unlocked;
12568                 }
12569                 if (addr == NULL) {
12570                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12571                         error = ENOENT;
12572                         goto out_unlocked;
12573                 } else {
12574                         /*
12575                          * UDP style, we must go ahead and start the INIT
12576                          * process
12577                          */
12578                         uint32_t vrf_id;
12579
12580                         if ((use_rcvinfo) && (srcv) &&
12581                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12582                             ((srcv->sinfo_flags & SCTP_EOF) &&
12583                             (sndlen == 0)))) {
12584                                 /*-
12585                                  * User asks to abort a non-existant assoc,
12586                                  * or EOF a non-existant assoc with no data
12587                                  */
12588                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12589                                 error = ENOENT;
12590                                 goto out_unlocked;
12591                         }
12592                         /* get an asoc/stcb struct */
12593                         vrf_id = inp->def_vrf_id;
12594 #ifdef INVARIANTS
12595                         if (create_lock_applied == 0) {
12596                                 panic("Error, should hold create lock and I don't?");
12597                         }
12598 #endif
12599                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12600                             p
12601                             );
12602                         if (stcb == NULL) {
12603                                 /* Error is setup for us in the call */
12604                                 goto out_unlocked;
12605                         }
12606                         if (create_lock_applied) {
12607                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12608                                 create_lock_applied = 0;
12609                         } else {
12610                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12611                         }
12612                         /*
12613                          * Turn on queue only flag to prevent data from
12614                          * being sent
12615                          */
12616                         queue_only = 1;
12617                         asoc = &stcb->asoc;
12618                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12619                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12620
12621                         /* initialize authentication params for the assoc */
12622                         sctp_initialize_auth_params(inp, stcb);
12623
12624                         if (control) {
12625                                 /*
12626                                  * see if a init structure exists in cmsg
12627                                  * headers
12628                                  */
12629                                 struct sctp_initmsg initm;
12630                                 int i;
12631
12632                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12633                                     sizeof(initm))) {
12634                                         /*
12635                                          * we have an INIT override of the
12636                                          * default
12637                                          */
12638                                         if (initm.sinit_max_attempts)
12639                                                 asoc->max_init_times = initm.sinit_max_attempts;
12640                                         if (initm.sinit_num_ostreams)
12641                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12642                                         if (initm.sinit_max_instreams)
12643                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12644                                         if (initm.sinit_max_init_timeo)
12645                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12646                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12647                                                 struct sctp_stream_out *tmp_str;
12648                                                 int had_lock = 0;
12649
12650                                                 /* Default is NOT correct */
12651                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12652                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12653                                                 /*
12654                                                  * What happens if this
12655                                                  * fails? we panic ...
12656                                                  */
12657
12658                                                 if (hold_tcblock) {
12659                                                         had_lock = 1;
12660                                                         SCTP_TCB_UNLOCK(stcb);
12661                                                 }
12662                                                 SCTP_MALLOC(tmp_str,
12663                                                     struct sctp_stream_out *,
12664                                                     (asoc->pre_open_streams *
12665                                                     sizeof(struct sctp_stream_out)),
12666                                                     SCTP_M_STRMO);
12667                                                 if (had_lock) {
12668                                                         SCTP_TCB_LOCK(stcb);
12669                                                 }
12670                                                 if (tmp_str != NULL) {
12671                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12672                                                         asoc->strmout = tmp_str;
12673                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12674                                                 } else {
12675                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12676                                                 }
12677                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12678                                                         /*-
12679                                                          * inbound side must be set
12680                                                          * to 0xffff, also NOTE when
12681                                                          * we get the INIT-ACK back
12682                                                          * (for INIT sender) we MUST
12683                                                          * reduce the count
12684                                                          * (streamoutcnt) but first
12685                                                          * check if we sent to any
12686                                                          * of the upper streams that
12687                                                          * were dropped (if some
12688                                                          * were). Those that were
12689                                                          * dropped must be notified
12690                                                          * to the upper layer as
12691                                                          * failed to send.
12692                                                          */
12693                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12694                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12695                                                         asoc->strmout[i].stream_no = i;
12696                                                         asoc->strmout[i].last_msg_incomplete = 0;
12697                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12698                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12699                                                 }
12700                                         }
12701                                 }
12702                         }
12703                         hold_tcblock = 1;
12704                         /* out with the INIT */
12705                         queue_only_for_init = 1;
12706                         /*-
12707                          * we may want to dig in after this call and adjust the MTU
12708                          * value. It defaulted to 1500 (constant) but the ro
12709                          * structure may now have an update and thus we may need to
12710                          * change it BEFORE we append the message.
12711                          */
12712                         net = stcb->asoc.primary_destination;
12713                         asoc = &stcb->asoc;
12714                 }
12715         }
12716         if ((SCTP_SO_IS_NBIO(so)
12717             || (flags & MSG_NBIO)
12718             )) {
12719                 non_blocking = 1;
12720         }
12721         asoc = &stcb->asoc;
12722         atomic_add_int(&stcb->total_sends, 1);
12723
12724         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12725                 if (sndlen > asoc->smallest_mtu) {
12726                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12727                         error = EMSGSIZE;
12728                         goto out_unlocked;
12729                 }
12730         }
12731         /* would we block? */
12732         if (non_blocking) {
12733                 if (hold_tcblock == 0) {
12734                         SCTP_TCB_LOCK(stcb);
12735                         hold_tcblock = 1;
12736                 }
12737                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12738                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12739                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12740                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12741                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12742                                 error = EMSGSIZE;
12743                         else
12744                                 error = EWOULDBLOCK;
12745                         goto out_unlocked;
12746                 }
12747                 stcb->asoc.sb_send_resv += sndlen;
12748                 SCTP_TCB_UNLOCK(stcb);
12749                 hold_tcblock = 0;
12750         } else {
12751                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12752         }
12753         local_soresv = sndlen;
12754         /* Keep the stcb from being freed under our feet */
12755         if (free_cnt_applied) {
12756 #ifdef INVARIANTS
12757                 panic("refcnt already incremented");
12758 #else
12759                 printf("refcnt:1 already incremented?\n");
12760 #endif
12761         } else {
12762                 atomic_add_int(&stcb->asoc.refcnt, 1);
12763                 free_cnt_applied = 1;
12764         }
12765         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12766                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12767                 error = ECONNRESET;
12768                 goto out_unlocked;
12769         }
12770         if (create_lock_applied) {
12771                 SCTP_ASOC_CREATE_UNLOCK(inp);
12772                 create_lock_applied = 0;
12773         }
12774         if (asoc->stream_reset_outstanding) {
12775                 /*
12776                  * Can't queue any data while stream reset is underway.
12777                  */
12778                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12779                 error = EAGAIN;
12780                 goto out_unlocked;
12781         }
12782         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12783             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12784                 queue_only = 1;
12785         }
12786         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12787                 /* Grab the default stuff from the asoc */
12788                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12789         }
12790         /* we are now done with all control */
12791         if (control) {
12792                 sctp_m_freem(control);
12793                 control = NULL;
12794         }
12795         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12796             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12797             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12798             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12799                 if ((use_rcvinfo) &&
12800                     (srcv->sinfo_flags & SCTP_ABORT)) {
12801                         ;
12802                 } else {
12803                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12804                         error = ECONNRESET;
12805                         goto out_unlocked;
12806                 }
12807         }
12808         /* Ok, we will attempt a msgsnd :> */
12809         if (p) {
12810                 p->td_ru.ru_msgsnd++;
12811         }
12812         if (stcb) {
12813                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12814                         net = stcb->asoc.primary_destination;
12815                 }
12816         }
12817         if (net == NULL) {
12818                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12819                 error = EINVAL;
12820                 goto out_unlocked;
12821         }
12822         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12823                 /*-
12824                  * CMT: Added check for CMT above. net above is the primary
12825                  * dest. If CMT is ON, sender should always attempt to send
12826                  * with the output routine sctp_fill_outqueue() that loops
12827                  * through all destination addresses. Therefore, if CMT is
12828                  * ON, queue_only is NOT set to 1 here, so that
12829                  * sctp_chunk_output() can be called below.
12830                  */
12831                 queue_only = 1;
12832         } else if (asoc->ifp_had_enobuf) {
12833                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12834                 if (net->flight_size > (net->mtu * 2))
12835                         queue_only = 1;
12836                 asoc->ifp_had_enobuf = 0;
12837         } else {
12838                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12839                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12840         }
12841         /* Are we aborting? */
12842         if (srcv->sinfo_flags & SCTP_ABORT) {
12843                 struct mbuf *mm;
12844                 int tot_demand, tot_out = 0, max_out;
12845
12846                 SCTP_STAT_INCR(sctps_sends_with_abort);
12847                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12848                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12849                         /* It has to be up before we abort */
12850                         /* how big is the user initiated abort? */
12851                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12852                         error = EINVAL;
12853                         goto out;
12854                 }
12855                 if (hold_tcblock) {
12856                         SCTP_TCB_UNLOCK(stcb);
12857                         hold_tcblock = 0;
12858                 }
12859                 if (top) {
12860                         struct mbuf *cntm = NULL;
12861
12862                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12863                         if (sndlen != 0) {
12864                                 cntm = top;
12865                                 while (cntm) {
12866                                         tot_out += SCTP_BUF_LEN(cntm);
12867                                         cntm = SCTP_BUF_NEXT(cntm);
12868                                 }
12869                         }
12870                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12871                 } else {
12872                         /* Must fit in a MTU */
12873                         tot_out = sndlen;
12874                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12875                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12876                                 /* To big */
12877                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12878                                 error = EMSGSIZE;
12879                                 goto out;
12880                         }
12881                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12882                 }
12883                 if (mm == NULL) {
12884                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12885                         error = ENOMEM;
12886                         goto out;
12887                 }
12888                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12889                 max_out -= sizeof(struct sctp_abort_msg);
12890                 if (tot_out > max_out) {
12891                         tot_out = max_out;
12892                 }
12893                 if (mm) {
12894                         struct sctp_paramhdr *ph;
12895
12896                         /* now move forward the data pointer */
12897                         ph = mtod(mm, struct sctp_paramhdr *);
12898                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12899                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12900                         ph++;
12901                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12902                         if (top == NULL) {
12903                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12904                                 if (error) {
12905                                         /*-
12906                                          * Here if we can't get his data we
12907                                          * still abort we just don't get to
12908                                          * send the users note :-0
12909                                          */
12910                                         sctp_m_freem(mm);
12911                                         mm = NULL;
12912                                 }
12913                         } else {
12914                                 if (sndlen != 0) {
12915                                         SCTP_BUF_NEXT(mm) = top;
12916                                 }
12917                         }
12918                 }
12919                 if (hold_tcblock == 0) {
12920                         SCTP_TCB_LOCK(stcb);
12921                         hold_tcblock = 1;
12922                 }
12923                 atomic_add_int(&stcb->asoc.refcnt, -1);
12924                 free_cnt_applied = 0;
12925                 /* release this lock, otherwise we hang on ourselves */
12926                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12927                     SCTP_RESPONSE_TO_USER_REQ,
12928                     mm, SCTP_SO_LOCKED);
12929                 /* now relock the stcb so everything is sane */
12930                 hold_tcblock = 0;
12931                 stcb = NULL;
12932                 /*
12933                  * In this case top is already chained to mm avoid double
12934                  * free, since we free it below if top != NULL and driver
12935                  * would free it after sending the packet out
12936                  */
12937                 if (sndlen != 0) {
12938                         top = NULL;
12939                 }
12940                 goto out_unlocked;
12941         }
12942         /* Calculate the maximum we can send */
12943         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12944         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12945                 if (non_blocking) {
12946                         /* we already checked for non-blocking above. */
12947                         max_len = sndlen;
12948                 } else {
12949                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12950                 }
12951         } else {
12952                 max_len = 0;
12953         }
12954         if (hold_tcblock) {
12955                 SCTP_TCB_UNLOCK(stcb);
12956                 hold_tcblock = 0;
12957         }
12958         /* Is the stream no. valid? */
12959         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12960                 /* Invalid stream number */
12961                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12962                 error = EINVAL;
12963                 goto out_unlocked;
12964         }
12965         if (asoc->strmout == NULL) {
12966                 /* huh? software error */
12967                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12968                 error = EFAULT;
12969                 goto out_unlocked;
12970         }
12971         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12972         if ((user_marks_eor == 0) &&
12973             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12974                 /* It will NEVER fit */
12975                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12976                 error = EMSGSIZE;
12977                 goto out_unlocked;
12978         }
12979         if ((uio == NULL) && user_marks_eor) {
12980                 /*-
12981                  * We do not support eeor mode for
12982                  * sending with mbuf chains (like sendfile).
12983                  */
12984                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12985                 error = EINVAL;
12986                 goto out_unlocked;
12987         }
12988         if (user_marks_eor) {
12989                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12990         } else {
12991                 /*-
12992                  * For non-eeor the whole message must fit in
12993                  * the socket send buffer.
12994                  */
12995                 local_add_more = sndlen;
12996         }
12997         len = 0;
12998         if (non_blocking) {
12999                 goto skip_preblock;
13000         }
13001         if (((max_len <= local_add_more) &&
13002             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13003             (max_len == 0) ||
13004             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13005                 /* No room right now ! */
13006                 SOCKBUF_LOCK(&so->so_snd);
13007                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13008                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13009                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13010                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13011                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13012                             inqueue_bytes,
13013                             local_add_more,
13014                             stcb->asoc.stream_queue_cnt,
13015                             stcb->asoc.chunks_on_out_queue,
13016                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13017                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13018                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13019                         }
13020                         be.error = 0;
13021                         stcb->block_entry = &be;
13022                         error = sbwait(&so->so_snd);
13023                         stcb->block_entry = NULL;
13024                         if (error || so->so_error || be.error) {
13025                                 if (error == 0) {
13026                                         if (so->so_error)
13027                                                 error = so->so_error;
13028                                         if (be.error) {
13029                                                 error = be.error;
13030                                         }
13031                                 }
13032                                 SOCKBUF_UNLOCK(&so->so_snd);
13033                                 goto out_unlocked;
13034                         }
13035                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13036                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13037                                     so, asoc, stcb->asoc.total_output_queue_size);
13038                         }
13039                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13040                                 goto out_unlocked;
13041                         }
13042                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13043                 }
13044                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13045                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13046                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13047                 } else {
13048                         max_len = 0;
13049                 }
13050                 SOCKBUF_UNLOCK(&so->so_snd);
13051         }
13052 skip_preblock:
13053         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13054                 goto out_unlocked;
13055         }
13056         /*
13057          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13058          * case NOTE: uio will be null when top/mbuf is passed
13059          */
13060         if (sndlen == 0) {
13061                 if (srcv->sinfo_flags & SCTP_EOF) {
13062                         got_all_of_the_send = 1;
13063                         goto dataless_eof;
13064                 } else {
13065                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13066                         error = EINVAL;
13067                         goto out;
13068                 }
13069         }
13070         if (top == NULL) {
13071                 struct sctp_stream_queue_pending *sp;
13072                 struct sctp_stream_out *strm;
13073                 uint32_t sndout, initial_out;
13074
13075                 initial_out = uio->uio_resid;
13076
13077                 SCTP_TCB_SEND_LOCK(stcb);
13078                 if ((asoc->stream_locked) &&
13079                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13080                         SCTP_TCB_SEND_UNLOCK(stcb);
13081                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13082                         error = EINVAL;
13083                         goto out;
13084                 }
13085                 SCTP_TCB_SEND_UNLOCK(stcb);
13086
13087                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13088                 if (strm->last_msg_incomplete == 0) {
13089         do_a_copy_in:
13090                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13091                         if ((sp == NULL) || (error)) {
13092                                 goto out;
13093                         }
13094                         SCTP_TCB_SEND_LOCK(stcb);
13095                         if (sp->msg_is_complete) {
13096                                 strm->last_msg_incomplete = 0;
13097                                 asoc->stream_locked = 0;
13098                         } else {
13099                                 /*
13100                                  * Just got locked to this guy in case of an
13101                                  * interrupt.
13102                                  */
13103                                 strm->last_msg_incomplete = 1;
13104                                 asoc->stream_locked = 1;
13105                                 asoc->stream_locked_on = srcv->sinfo_stream;
13106                                 sp->sender_all_done = 0;
13107                         }
13108                         sctp_snd_sb_alloc(stcb, sp->length);
13109                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13110                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13111                                 sp->strseq = strm->next_sequence_sent;
13112                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13113                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13114                                             (uintptr_t) stcb, sp->length,
13115                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13116                                 }
13117                                 strm->next_sequence_sent++;
13118                         } else {
13119                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13120                         }
13121                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13122                         if ((strm->next_spoke.tqe_next == NULL) &&
13123                             (strm->next_spoke.tqe_prev == NULL)) {
13124                                 /* Not on wheel, insert */
13125                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
13126                         }
13127                         SCTP_TCB_SEND_UNLOCK(stcb);
13128                 } else {
13129                         SCTP_TCB_SEND_LOCK(stcb);
13130                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13131                         SCTP_TCB_SEND_UNLOCK(stcb);
13132                         if (sp == NULL) {
13133                                 /* ???? Huh ??? last msg is gone */
13134 #ifdef INVARIANTS
13135                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13136 #else
13137                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13138                                 strm->last_msg_incomplete = 0;
13139 #endif
13140                                 goto do_a_copy_in;
13141
13142                         }
13143                 }
13144                 while (uio->uio_resid > 0) {
13145                         /* How much room do we have? */
13146                         struct mbuf *new_tail, *mm;
13147
13148                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13149                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13150                         else
13151                                 max_len = 0;
13152
13153                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13154                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13155                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13156                                 sndout = 0;
13157                                 new_tail = NULL;
13158                                 if (hold_tcblock) {
13159                                         SCTP_TCB_UNLOCK(stcb);
13160                                         hold_tcblock = 0;
13161                                 }
13162                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13163                                 if ((mm == NULL) || error) {
13164                                         if (mm) {
13165                                                 sctp_m_freem(mm);
13166                                         }
13167                                         goto out;
13168                                 }
13169                                 /* Update the mbuf and count */
13170                                 SCTP_TCB_SEND_LOCK(stcb);
13171                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13172                                         /*
13173                                          * we need to get out. Peer probably
13174                                          * aborted.
13175                                          */
13176                                         sctp_m_freem(mm);
13177                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13178                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13179                                                 error = ECONNRESET;
13180                                         }
13181                                         SCTP_TCB_SEND_UNLOCK(stcb);
13182                                         goto out;
13183                                 }
13184                                 if (sp->tail_mbuf) {
13185                                         /* tack it to the end */
13186                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13187                                         sp->tail_mbuf = new_tail;
13188                                 } else {
13189                                         /* A stolen mbuf */
13190                                         sp->data = mm;
13191                                         sp->tail_mbuf = new_tail;
13192                                 }
13193                                 sctp_snd_sb_alloc(stcb, sndout);
13194                                 atomic_add_int(&sp->length, sndout);
13195                                 len += sndout;
13196
13197                                 /* Did we reach EOR? */
13198                                 if ((uio->uio_resid == 0) &&
13199                                     ((user_marks_eor == 0) ||
13200                                     (srcv->sinfo_flags & SCTP_EOF) ||
13201                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13202                                         sp->msg_is_complete = 1;
13203                                 } else {
13204                                         sp->msg_is_complete = 0;
13205                                 }
13206                                 SCTP_TCB_SEND_UNLOCK(stcb);
13207                         }
13208                         if (uio->uio_resid == 0) {
13209                                 /* got it all? */
13210                                 continue;
13211                         }
13212                         /* PR-SCTP? */
13213                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13214                                 /*
13215                                  * This is ugly but we must assure locking
13216                                  * order
13217                                  */
13218                                 if (hold_tcblock == 0) {
13219                                         SCTP_TCB_LOCK(stcb);
13220                                         hold_tcblock = 1;
13221                                 }
13222                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13223                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13224                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13225                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13226                                 else
13227                                         max_len = 0;
13228                                 if (max_len > 0) {
13229                                         continue;
13230                                 }
13231                                 SCTP_TCB_UNLOCK(stcb);
13232                                 hold_tcblock = 0;
13233                         }
13234                         /* wait for space now */
13235                         if (non_blocking) {
13236                                 /* Non-blocking io in place out */
13237                                 goto skip_out_eof;
13238                         }
13239                         if ((net->flight_size > net->cwnd) &&
13240                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13241                                 queue_only = 1;
13242                         } else if (asoc->ifp_had_enobuf) {
13243                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13244                                 if (net->flight_size > (net->mtu * 2)) {
13245                                         queue_only = 1;
13246                                 } else {
13247                                         queue_only = 0;
13248                                 }
13249                                 asoc->ifp_had_enobuf = 0;
13250                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13251                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13252                         } else {
13253                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13254                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13255                                 if (net->flight_size > net->cwnd) {
13256                                         queue_only = 1;
13257                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13258                                 } else {
13259                                         queue_only = 0;
13260                                 }
13261                         }
13262                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13263                             (stcb->asoc.total_flight > 0) &&
13264                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13265                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13266
13267                                 /*-
13268                                  * Ok, Nagle is set on and we have data outstanding.
13269                                  * Don't send anything and let SACKs drive out the
13270                                  * data unless wen have a "full" segment to send.
13271                                  */
13272                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13273                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13274                                 }
13275                                 SCTP_STAT_INCR(sctps_naglequeued);
13276                                 nagle_applies = 1;
13277                         } else {
13278                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13279                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13280                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13281                                 }
13282                                 SCTP_STAT_INCR(sctps_naglesent);
13283                                 nagle_applies = 0;
13284                         }
13285                         /* What about the INIT, send it maybe */
13286                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13287
13288                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13289                                     nagle_applies, un_sent);
13290                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13291                                     stcb->asoc.total_flight,
13292                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13293                         }
13294                         if (queue_only_for_init) {
13295                                 if (hold_tcblock == 0) {
13296                                         SCTP_TCB_LOCK(stcb);
13297                                         hold_tcblock = 1;
13298                                 }
13299                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13300                                         /* a collision took us forward? */
13301                                         queue_only_for_init = 0;
13302                                         queue_only = 0;
13303                                 } else {
13304                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13305                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13306                                         queue_only_for_init = 0;
13307                                         queue_only = 1;
13308                                 }
13309                         }
13310                         if ((queue_only == 0) && (nagle_applies == 0)) {
13311                                 /*-
13312                                  * need to start chunk output
13313                                  * before blocking.. note that if
13314                                  * a lock is already applied, then
13315                                  * the input via the net is happening
13316                                  * and I don't need to start output :-D
13317                                  */
13318                                 if (hold_tcblock == 0) {
13319                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13320                                                 hold_tcblock = 1;
13321                                                 sctp_chunk_output(inp,
13322                                                     stcb,
13323                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13324                                         }
13325                                 } else {
13326                                         sctp_chunk_output(inp,
13327                                             stcb,
13328                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13329                                 }
13330                                 if (hold_tcblock == 1) {
13331                                         SCTP_TCB_UNLOCK(stcb);
13332                                         hold_tcblock = 0;
13333                                 }
13334                         }
13335                         SOCKBUF_LOCK(&so->so_snd);
13336                         /*-
13337                          * This is a bit strange, but I think it will
13338                          * work. The total_output_queue_size is locked and
13339                          * protected by the TCB_LOCK, which we just released.
13340                          * There is a race that can occur between releasing it
13341                          * above, and me getting the socket lock, where sacks
13342                          * come in but we have not put the SB_WAIT on the
13343                          * so_snd buffer to get the wakeup. After the LOCK
13344                          * is applied the sack_processing will also need to
13345                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13346                          * once we have the socket buffer lock if we recheck the
13347                          * size we KNOW we will get to sleep safely with the
13348                          * wakeup flag in place.
13349                          */
13350                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13351                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13352                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13353                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13354                                             so, asoc, uio->uio_resid);
13355                                 }
13356                                 be.error = 0;
13357                                 stcb->block_entry = &be;
13358                                 error = sbwait(&so->so_snd);
13359                                 stcb->block_entry = NULL;
13360
13361                                 if (error || so->so_error || be.error) {
13362                                         if (error == 0) {
13363                                                 if (so->so_error)
13364                                                         error = so->so_error;
13365                                                 if (be.error) {
13366                                                         error = be.error;
13367                                                 }
13368                                         }
13369                                         SOCKBUF_UNLOCK(&so->so_snd);
13370                                         goto out_unlocked;
13371                                 }
13372                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13373                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13374                                             so, asoc, stcb->asoc.total_output_queue_size);
13375                                 }
13376                         }
13377                         SOCKBUF_UNLOCK(&so->so_snd);
13378                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13379                                 goto out_unlocked;
13380                         }
13381                 }
13382                 SCTP_TCB_SEND_LOCK(stcb);
13383                 if (sp) {
13384                         if (sp->msg_is_complete == 0) {
13385                                 strm->last_msg_incomplete = 1;
13386                                 asoc->stream_locked = 1;
13387                                 asoc->stream_locked_on = srcv->sinfo_stream;
13388                         } else {
13389                                 sp->sender_all_done = 1;
13390                                 strm->last_msg_incomplete = 0;
13391                                 asoc->stream_locked = 0;
13392                         }
13393                 } else {
13394                         SCTP_PRINTF("Huh no sp TSNH?\n");
13395                         strm->last_msg_incomplete = 0;
13396                         asoc->stream_locked = 0;
13397                 }
13398                 SCTP_TCB_SEND_UNLOCK(stcb);
13399                 if (uio->uio_resid == 0) {
13400                         got_all_of_the_send = 1;
13401                 }
13402         } else if (top) {
13403                 /* We send in a 0, since we do NOT have any locks */
13404                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13405                 top = NULL;
13406                 if (srcv->sinfo_flags & SCTP_EOF) {
13407                         /*
13408                          * This should only happen for Panda for the mbuf
13409                          * send case, which does NOT yet support EEOR mode.
13410                          * Thus, we can just set this flag to do the proper
13411                          * EOF handling.
13412                          */
13413                         got_all_of_the_send = 1;
13414                 }
13415         }
13416         if (error) {
13417                 goto out;
13418         }
13419 dataless_eof:
13420         /* EOF thing ? */
13421         if ((srcv->sinfo_flags & SCTP_EOF) &&
13422             (got_all_of_the_send == 1) &&
13423             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13424                 int cnt;
13425
13426                 SCTP_STAT_INCR(sctps_sends_with_eof);
13427                 error = 0;
13428                 if (hold_tcblock == 0) {
13429                         SCTP_TCB_LOCK(stcb);
13430                         hold_tcblock = 1;
13431                 }
13432                 cnt = sctp_is_there_unsent_data(stcb);
13433                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13434                     TAILQ_EMPTY(&asoc->sent_queue) &&
13435                     (cnt == 0)) {
13436                         if (asoc->locked_on_sending) {
13437                                 goto abort_anyway;
13438                         }
13439                         /* there is nothing queued to send, so I'm done... */
13440                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13441                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13442                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13443                                 /* only send SHUTDOWN the first time through */
13444                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13445                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13446                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13447                                 }
13448                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13449                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13450                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13451                                     asoc->primary_destination);
13452                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13453                                     asoc->primary_destination);
13454                         }
13455                 } else {
13456                         /*-
13457                          * we still got (or just got) data to send, so set
13458                          * SHUTDOWN_PENDING
13459                          */
13460                         /*-
13461                          * XXX sockets draft says that SCTP_EOF should be
13462                          * sent with no data.  currently, we will allow user
13463                          * data to be sent first and move to
13464                          * SHUTDOWN-PENDING
13465                          */
13466                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13467                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13468                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13469                                 if (hold_tcblock == 0) {
13470                                         SCTP_TCB_LOCK(stcb);
13471                                         hold_tcblock = 1;
13472                                 }
13473                                 if (asoc->locked_on_sending) {
13474                                         /* Locked to send out the data */
13475                                         struct sctp_stream_queue_pending *sp;
13476
13477                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13478                                         if (sp) {
13479                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13480                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13481                                         }
13482                                 }
13483                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13484                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13485                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13486                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13487                         abort_anyway:
13488                                         if (free_cnt_applied) {
13489                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13490                                                 free_cnt_applied = 0;
13491                                         }
13492                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13493                                             SCTP_RESPONSE_TO_USER_REQ,
13494                                             NULL, SCTP_SO_LOCKED);
13495                                         /*
13496                                          * now relock the stcb so everything
13497                                          * is sane
13498                                          */
13499                                         hold_tcblock = 0;
13500                                         stcb = NULL;
13501                                         goto out;
13502                                 }
13503                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13504                                     asoc->primary_destination);
13505                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13506                         }
13507                 }
13508         }
13509 skip_out_eof:
13510         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13511                 some_on_control = 1;
13512         }
13513         if ((net->flight_size > net->cwnd) &&
13514             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
13515                 queue_only = 1;
13516         } else if (asoc->ifp_had_enobuf) {
13517                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13518                 if (net->flight_size > (net->mtu * 2)) {
13519                         queue_only = 1;
13520                 } else {
13521                         queue_only = 0;
13522                 }
13523                 asoc->ifp_had_enobuf = 0;
13524                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13525                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13526         } else {
13527                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13528                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13529                 if (net->flight_size > net->cwnd) {
13530                         queue_only = 1;
13531                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13532                 } else {
13533                         queue_only = 0;
13534                 }
13535         }
13536         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13537             (stcb->asoc.total_flight > 0) &&
13538             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13539             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13540                 /*-
13541                  * Ok, Nagle is set on and we have data outstanding.
13542                  * Don't send anything and let SACKs drive out the
13543                  * data unless wen have a "full" segment to send.
13544                  */
13545                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13546                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13547                 }
13548                 SCTP_STAT_INCR(sctps_naglequeued);
13549                 nagle_applies = 1;
13550         } else {
13551                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13552                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13553                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13554                 }
13555                 SCTP_STAT_INCR(sctps_naglesent);
13556                 nagle_applies = 0;
13557         }
13558         if (queue_only_for_init) {
13559                 if (hold_tcblock == 0) {
13560                         SCTP_TCB_LOCK(stcb);
13561                         hold_tcblock = 1;
13562                 }
13563                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13564                         /* a collision took us forward? */
13565                         queue_only_for_init = 0;
13566                         queue_only = 0;
13567                 } else {
13568                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13569                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13570                         queue_only_for_init = 0;
13571                         queue_only = 1;
13572                 }
13573         }
13574         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13575                 /* we can attempt to send too. */
13576                 if (hold_tcblock == 0) {
13577                         /*
13578                          * If there is activity recv'ing sacks no need to
13579                          * send
13580                          */
13581                         if (SCTP_TCB_TRYLOCK(stcb)) {
13582                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13583                                 hold_tcblock = 1;
13584                         }
13585                 } else {
13586                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13587                 }
13588         } else if ((queue_only == 0) &&
13589                     (stcb->asoc.peers_rwnd == 0) &&
13590             (stcb->asoc.total_flight == 0)) {
13591                 /* We get to have a probe outstanding */
13592                 if (hold_tcblock == 0) {
13593                         hold_tcblock = 1;
13594                         SCTP_TCB_LOCK(stcb);
13595                 }
13596                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13597         } else if (some_on_control) {
13598                 int num_out, reason, frag_point;
13599
13600                 /* Here we do control only */
13601                 if (hold_tcblock == 0) {
13602                         hold_tcblock = 1;
13603                         SCTP_TCB_LOCK(stcb);
13604                 }
13605                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13606                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13607                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13608         }
13609         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13610             queue_only, stcb->asoc.peers_rwnd, un_sent,
13611             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13612             stcb->asoc.total_output_queue_size, error);
13613
13614 out:
13615 out_unlocked:
13616
13617         if (local_soresv && stcb) {
13618                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13619                 local_soresv = 0;
13620         }
13621         if (create_lock_applied) {
13622                 SCTP_ASOC_CREATE_UNLOCK(inp);
13623                 create_lock_applied = 0;
13624         }
13625         if ((stcb) && hold_tcblock) {
13626                 SCTP_TCB_UNLOCK(stcb);
13627         }
13628         if (stcb && free_cnt_applied) {
13629                 atomic_add_int(&stcb->asoc.refcnt, -1);
13630         }
13631 #ifdef INVARIANTS
13632         if (stcb) {
13633                 if (mtx_owned(&stcb->tcb_mtx)) {
13634                         panic("Leaving with tcb mtx owned?");
13635                 }
13636                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13637                         panic("Leaving with tcb send mtx owned?");
13638                 }
13639         }
13640 #endif
13641         if (top) {
13642                 sctp_m_freem(top);
13643         }
13644         if (control) {
13645                 sctp_m_freem(control);
13646         }
13647         return (error);
13648 }
13649
13650
13651 /*
13652  * generate an AUTHentication chunk, if required
13653  */
13654 struct mbuf *
13655 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13656     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13657     struct sctp_tcb *stcb, uint8_t chunk)
13658 {
13659         struct mbuf *m_auth;
13660         struct sctp_auth_chunk *auth;
13661         int chunk_len;
13662
13663         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13664             (stcb == NULL))
13665                 return (m);
13666
13667         /* sysctl disabled auth? */
13668         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13669                 return (m);
13670
13671         /* peer doesn't do auth... */
13672         if (!stcb->asoc.peer_supports_auth) {
13673                 return (m);
13674         }
13675         /* does the requested chunk require auth? */
13676         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13677                 return (m);
13678         }
13679         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13680         if (m_auth == NULL) {
13681                 /* no mbuf's */
13682                 return (m);
13683         }
13684         /* reserve some space if this will be the first mbuf */
13685         if (m == NULL)
13686                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13687         /* fill in the AUTH chunk details */
13688         auth = mtod(m_auth, struct sctp_auth_chunk *);
13689         bzero(auth, sizeof(*auth));
13690         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13691         auth->ch.chunk_flags = 0;
13692         chunk_len = sizeof(*auth) +
13693             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13694         auth->ch.chunk_length = htons(chunk_len);
13695         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13696         /* key id and hmac digest will be computed and filled in upon send */
13697
13698         /* save the offset where the auth was inserted into the chain */
13699         if (m != NULL) {
13700                 struct mbuf *cn;
13701
13702                 *offset = 0;
13703                 cn = m;
13704                 while (cn) {
13705                         *offset += SCTP_BUF_LEN(cn);
13706                         cn = SCTP_BUF_NEXT(cn);
13707                 }
13708         } else
13709                 *offset = 0;
13710
13711         /* update length and return pointer to the auth chunk */
13712         SCTP_BUF_LEN(m_auth) = chunk_len;
13713         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13714         if (auth_ret != NULL)
13715                 *auth_ret = auth;
13716
13717         return (m);
13718 }
13719
13720 #ifdef INET6
13721 int
13722 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13723 {
13724         struct nd_prefix *pfx = NULL;
13725         struct nd_pfxrouter *pfxrtr = NULL;
13726         struct sockaddr_in6 gw6;
13727
13728         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13729                 return (0);
13730
13731         /* get prefix entry of address */
13732         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13733                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13734                         continue;
13735                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13736                     &src6->sin6_addr, &pfx->ndpr_mask))
13737                         break;
13738         }
13739         /* no prefix entry in the prefix list */
13740         if (pfx == NULL) {
13741                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13742                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13743                 return (0);
13744         }
13745         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13746         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13747
13748         /* search installed gateway from prefix entry */
13749         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13750             pfxrtr->pfr_next) {
13751                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13752                 gw6.sin6_family = AF_INET6;
13753                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13754                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13755                     sizeof(struct in6_addr));
13756                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13757                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13758                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13759                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13760                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13761                     ro->ro_rt->rt_gateway)) {
13762                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13763                         return (1);
13764                 }
13765         }
13766         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13767         return (0);
13768 }
13769
13770 #endif
13771
13772 int
13773 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13774 {
13775         struct sockaddr_in *sin, *mask;
13776         struct ifaddr *ifa;
13777         struct in_addr srcnetaddr, gwnetaddr;
13778
13779         if (ro == NULL || ro->ro_rt == NULL ||
13780             sifa->address.sa.sa_family != AF_INET) {
13781                 return (0);
13782         }
13783         ifa = (struct ifaddr *)sifa->ifa;
13784         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13785         sin = (struct sockaddr_in *)&sifa->address.sin;
13786         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13787         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13788         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13789         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13790
13791         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13792         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13793         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13794         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13795         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13796         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13797                 return (1);
13798         }
13799         return (0);
13800 }