sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  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 <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     struct sctp_scoping *scope,
1867     int do_update)
1868 {
1869         if ((scope->loopback_scope == 0) &&
1870             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871                 /*
1872                  * skip loopback if not in scope *
1873                  */
1874                 return (0);
1875         }
1876         switch (ifa->address.sa.sa_family) {
1877 #ifdef INET
1878         case AF_INET:
1879                 if (scope->ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((scope->ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #endif
1897 #ifdef INET6
1898         case AF_INET6:
1899                 if (scope->ipv6_addr_legal) {
1900                         struct sockaddr_in6 *sin6;
1901
1902                         /*
1903                          * Must update the flags,  bummer, which means any
1904                          * IFA locks must now be applied HERE <->
1905                          */
1906                         if (do_update) {
1907                                 sctp_gather_internal_ifa_flags(ifa);
1908                         }
1909                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910                                 return (0);
1911                         }
1912                         /* ok to use deprecated addresses? */
1913                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915                                 /* skip unspecifed addresses */
1916                                 return (0);
1917                         }
1918                         if (    /* (local_scope == 0) && */
1919                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920                                 return (0);
1921                         }
1922                         if ((scope->site_scope == 0) &&
1923                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                 } else {
1927                         return (0);
1928                 }
1929                 break;
1930 #endif
1931         default:
1932                 return (0);
1933         }
1934         return (1);
1935 }
1936
1937 static struct mbuf *
1938 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939 {
1940 #if defined(INET) || defined(INET6)
1941         struct sctp_paramhdr *parmh;
1942         struct mbuf *mret;
1943         uint16_t plen;
1944
1945 #endif
1946
1947         switch (ifa->address.sa.sa_family) {
1948 #ifdef INET
1949         case AF_INET:
1950                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1951                 break;
1952 #endif
1953 #ifdef INET6
1954         case AF_INET6:
1955                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1956                 break;
1957 #endif
1958         default:
1959                 return (m);
1960         }
1961 #if defined(INET) || defined(INET6)
1962         if (M_TRAILINGSPACE(m) >= plen) {
1963                 /* easy side we just drop it on the end */
1964                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1965                 mret = m;
1966         } else {
1967                 /* Need more space */
1968                 mret = m;
1969                 while (SCTP_BUF_NEXT(mret) != NULL) {
1970                         mret = SCTP_BUF_NEXT(mret);
1971                 }
1972                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_DONTWAIT, 1, MT_DATA);
1973                 if (SCTP_BUF_NEXT(mret) == NULL) {
1974                         /* We are hosed, can't add more addresses */
1975                         return (m);
1976                 }
1977                 mret = SCTP_BUF_NEXT(mret);
1978                 parmh = mtod(mret, struct sctp_paramhdr *);
1979         }
1980         /* now add the parameter */
1981         switch (ifa->address.sa.sa_family) {
1982 #ifdef INET
1983         case AF_INET:
1984                 {
1985                         struct sctp_ipv4addr_param *ipv4p;
1986                         struct sockaddr_in *sin;
1987
1988                         sin = (struct sockaddr_in *)&ifa->address.sin;
1989                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1990                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1991                         parmh->param_length = htons(plen);
1992                         ipv4p->addr = sin->sin_addr.s_addr;
1993                         SCTP_BUF_LEN(mret) += plen;
1994                         break;
1995                 }
1996 #endif
1997 #ifdef INET6
1998         case AF_INET6:
1999                 {
2000                         struct sctp_ipv6addr_param *ipv6p;
2001                         struct sockaddr_in6 *sin6;
2002
2003                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2004                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2005                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2006                         parmh->param_length = htons(plen);
2007                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2008                             sizeof(ipv6p->addr));
2009                         /* clear embedded scope in the address */
2010                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2011                         SCTP_BUF_LEN(mret) += plen;
2012                         break;
2013                 }
2014 #endif
2015         default:
2016                 return (m);
2017         }
2018         if (len != NULL) {
2019                 *len += plen;
2020         }
2021         return (mret);
2022 #endif
2023 }
2024
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t * padding_len, uint16_t * chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063 #ifdef INET
2064                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2065                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2066                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2067                                         continue;
2068                                 }
2069 #endif
2070 #ifdef INET6
2071                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2072                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2073                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2074                                         continue;
2075                                 }
2076 #endif
2077                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2078                                         continue;
2079                                 }
2080                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2081                                         continue;
2082                                 }
2083                                 cnt++;
2084                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2085                                         break;
2086                                 }
2087                         }
2088                         if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                 break;
2090                         }
2091                 }
2092 skip_count:
2093                 if (cnt > 1) {
2094                         total_count = 0;
2095                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2096                                 cnt = 0;
2097                                 if ((scope->loopback_scope == 0) &&
2098                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2099                                         /*
2100                                          * Skip loopback devices if
2101                                          * loopback_scope not set
2102                                          */
2103                                         continue;
2104                                 }
2105                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2106 #ifdef INET
2107                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2108                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2109                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2110                                                 continue;
2111                                         }
2112 #endif
2113 #ifdef INET6
2114                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2115                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2116                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2117                                                 continue;
2118                                         }
2119 #endif
2120                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2121                                                 continue;
2122                                         }
2123                                         if (sctp_is_address_in_scope(sctp_ifap,
2124                                             scope, 0) == 0) {
2125                                                 continue;
2126                                         }
2127                                         if ((chunk_len != NULL) &&
2128                                             (padding_len != NULL) &&
2129                                             (*padding_len > 0)) {
2130                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2131                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2132                                                 *chunk_len += *padding_len;
2133                                                 *padding_len = 0;
2134                                         }
2135                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2136                                         if (limit_out) {
2137                                                 cnt++;
2138                                                 total_count++;
2139                                                 if (cnt >= 2) {
2140                                                         /*
2141                                                          * two from each
2142                                                          * address
2143                                                          */
2144                                                         break;
2145                                                 }
2146                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2147                                                         /* No more addresses */
2148                                                         break;
2149                                                 }
2150                                         }
2151                                 }
2152                         }
2153                 }
2154         } else {
2155                 struct sctp_laddr *laddr;
2156
2157                 cnt = cnt_inits_to;
2158                 /* First, how many ? */
2159                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2160                         if (laddr->ifa == NULL) {
2161                                 continue;
2162                         }
2163                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2164                                 /*
2165                                  * Address being deleted by the system, dont
2166                                  * list.
2167                                  */
2168                                 continue;
2169                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2170                                 /*
2171                                  * Address being deleted on this ep don't
2172                                  * list.
2173                                  */
2174                                 continue;
2175                         }
2176                         if (sctp_is_address_in_scope(laddr->ifa,
2177                             scope, 1) == 0) {
2178                                 continue;
2179                         }
2180                         cnt++;
2181                 }
2182                 /*
2183                  * To get through a NAT we only list addresses if we have
2184                  * more than one. That way if you just bind a single address
2185                  * we let the source of the init dictate our address.
2186                  */
2187                 if (cnt > 1) {
2188                         cnt = cnt_inits_to;
2189                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2190                                 if (laddr->ifa == NULL) {
2191                                         continue;
2192                                 }
2193                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2194                                         continue;
2195                                 }
2196                                 if (sctp_is_address_in_scope(laddr->ifa,
2197                                     scope, 0) == 0) {
2198                                         continue;
2199                                 }
2200                                 if ((chunk_len != NULL) &&
2201                                     (padding_len != NULL) &&
2202                                     (*padding_len > 0)) {
2203                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2204                                         SCTP_BUF_LEN(m_at) += *padding_len;
2205                                         *chunk_len += *padding_len;
2206                                         *padding_len = 0;
2207                                 }
2208                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2209                                 cnt++;
2210                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2211                                         break;
2212                                 }
2213                         }
2214                 }
2215         }
2216         SCTP_IPI_ADDR_RUNLOCK();
2217         return (m_at);
2218 }
2219
2220 static struct sctp_ifa *
2221 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2222     uint8_t dest_is_loop,
2223     uint8_t dest_is_priv,
2224     sa_family_t fam)
2225 {
2226         uint8_t dest_is_global = 0;
2227
2228         /* dest_is_priv is true if destination is a private address */
2229         /* dest_is_loop is true if destination is a loopback addresses */
2230
2231         /**
2232          * Here we determine if its a preferred address. A preferred address
2233          * means it is the same scope or higher scope then the destination.
2234          * L = loopback, P = private, G = global
2235          * -----------------------------------------
2236          *    src    |  dest | result
2237          *  ----------------------------------------
2238          *     L     |    L  |    yes
2239          *  -----------------------------------------
2240          *     P     |    L  |    yes-v4 no-v6
2241          *  -----------------------------------------
2242          *     G     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     L     |    P  |    no
2245          *  -----------------------------------------
2246          *     P     |    P  |    yes
2247          *  -----------------------------------------
2248          *     G     |    P  |    no
2249          *   -----------------------------------------
2250          *     L     |    G  |    no
2251          *   -----------------------------------------
2252          *     P     |    G  |    no
2253          *    -----------------------------------------
2254          *     G     |    G  |    yes
2255          *    -----------------------------------------
2256          */
2257
2258         if (ifa->address.sa.sa_family != fam) {
2259                 /* forget mis-matched family */
2260                 return (NULL);
2261         }
2262         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2263                 dest_is_global = 1;
2264         }
2265         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2266         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2267         /* Ok the address may be ok */
2268 #ifdef INET6
2269         if (fam == AF_INET6) {
2270                 /* ok to use deprecated addresses? no lets not! */
2271                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2272                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2273                         return (NULL);
2274                 }
2275                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2276                         if (dest_is_loop) {
2277                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2278                                 return (NULL);
2279                         }
2280                 }
2281                 if (ifa->src_is_glob) {
2282                         if (dest_is_loop) {
2283                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2284                                 return (NULL);
2285                         }
2286                 }
2287         }
2288 #endif
2289         /*
2290          * Now that we know what is what, implement or table this could in
2291          * theory be done slicker (it used to be), but this is
2292          * straightforward and easier to validate :-)
2293          */
2294         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2295             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2297             dest_is_loop, dest_is_priv, dest_is_global);
2298
2299         if ((ifa->src_is_loop) && (dest_is_priv)) {
2300                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2301                 return (NULL);
2302         }
2303         if ((ifa->src_is_glob) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_loop) && (dest_is_global)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_priv) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2313                 return (NULL);
2314         }
2315         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2316         /* its a preferred address */
2317         return (ifa);
2318 }
2319
2320 static struct sctp_ifa *
2321 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2322     uint8_t dest_is_loop,
2323     uint8_t dest_is_priv,
2324     sa_family_t fam)
2325 {
2326         uint8_t dest_is_global = 0;
2327
2328         /**
2329          * Here we determine if its a acceptable address. A acceptable
2330          * address means it is the same scope or higher scope but we can
2331          * allow for NAT which means its ok to have a global dest and a
2332          * private src.
2333          *
2334          * L = loopback, P = private, G = global
2335          * -----------------------------------------
2336          *  src    |  dest | result
2337          * -----------------------------------------
2338          *   L     |   L   |    yes
2339          *  -----------------------------------------
2340          *   P     |   L   |    yes-v4 no-v6
2341          *  -----------------------------------------
2342          *   G     |   L   |    yes
2343          * -----------------------------------------
2344          *   L     |   P   |    no
2345          * -----------------------------------------
2346          *   P     |   P   |    yes
2347          * -----------------------------------------
2348          *   G     |   P   |    yes - May not work
2349          * -----------------------------------------
2350          *   L     |   G   |    no
2351          * -----------------------------------------
2352          *   P     |   G   |    yes - May not work
2353          * -----------------------------------------
2354          *   G     |   G   |    yes
2355          * -----------------------------------------
2356          */
2357
2358         if (ifa->address.sa.sa_family != fam) {
2359                 /* forget non matching family */
2360                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2361                     ifa->address.sa.sa_family, fam);
2362                 return (NULL);
2363         }
2364         /* Ok the address may be ok */
2365         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2367             dest_is_loop, dest_is_priv);
2368         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2369                 dest_is_global = 1;
2370         }
2371 #ifdef INET6
2372         if (fam == AF_INET6) {
2373                 /* ok to use deprecated addresses? */
2374                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2375                         return (NULL);
2376                 }
2377                 if (ifa->src_is_priv) {
2378                         /* Special case, linklocal to loop */
2379                         if (dest_is_loop)
2380                                 return (NULL);
2381                 }
2382         }
2383 #endif
2384         /*
2385          * Now that we know what is what, implement our table. This could in
2386          * theory be done slicker (it used to be), but this is
2387          * straightforward and easier to validate :-)
2388          */
2389         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2390             ifa->src_is_loop,
2391             dest_is_priv);
2392         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2393                 return (NULL);
2394         }
2395         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2396             ifa->src_is_loop,
2397             dest_is_global);
2398         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2399                 return (NULL);
2400         }
2401         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2402         /* its an acceptable address */
2403         return (ifa);
2404 }
2405
2406 int
2407 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2408 {
2409         struct sctp_laddr *laddr;
2410
2411         if (stcb == NULL) {
2412                 /* There are no restrictions, no TCB :-) */
2413                 return (0);
2414         }
2415         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2416                 if (laddr->ifa == NULL) {
2417                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2418                             __FUNCTION__);
2419                         continue;
2420                 }
2421                 if (laddr->ifa == ifa) {
2422                         /* Yes it is on the list */
2423                         return (1);
2424                 }
2425         }
2426         return (0);
2427 }
2428
2429
2430 int
2431 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2432 {
2433         struct sctp_laddr *laddr;
2434
2435         if (ifa == NULL)
2436                 return (0);
2437         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2438                 if (laddr->ifa == NULL) {
2439                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2440                             __FUNCTION__);
2441                         continue;
2442                 }
2443                 if ((laddr->ifa == ifa) && laddr->action == 0)
2444                         /* same pointer */
2445                         return (1);
2446         }
2447         return (0);
2448 }
2449
2450
2451
2452 static struct sctp_ifa *
2453 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2454     sctp_route_t * ro,
2455     uint32_t vrf_id,
2456     int non_asoc_addr_ok,
2457     uint8_t dest_is_priv,
2458     uint8_t dest_is_loop,
2459     sa_family_t fam)
2460 {
2461         struct sctp_laddr *laddr, *starting_point;
2462         void *ifn;
2463         int resettotop = 0;
2464         struct sctp_ifn *sctp_ifn;
2465         struct sctp_ifa *sctp_ifa, *sifa;
2466         struct sctp_vrf *vrf;
2467         uint32_t ifn_index;
2468
2469         vrf = sctp_find_vrf(vrf_id);
2470         if (vrf == NULL)
2471                 return (NULL);
2472
2473         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2474         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2475         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2476         /*
2477          * first question, is the ifn we will emit on in our list, if so, we
2478          * want such an address. Note that we first looked for a preferred
2479          * address.
2480          */
2481         if (sctp_ifn) {
2482                 /* is a preferred one on the interface we route out? */
2483                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2484 #ifdef INET
2485                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2486                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2487                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2488                                 continue;
2489                         }
2490 #endif
2491 #ifdef INET6
2492                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2493                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2494                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2495                                 continue;
2496                         }
2497 #endif
2498                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2499                             (non_asoc_addr_ok == 0))
2500                                 continue;
2501                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2502                             dest_is_loop,
2503                             dest_is_priv, fam);
2504                         if (sifa == NULL)
2505                                 continue;
2506                         if (sctp_is_addr_in_ep(inp, sifa)) {
2507                                 atomic_add_int(&sifa->refcount, 1);
2508                                 return (sifa);
2509                         }
2510                 }
2511         }
2512         /*
2513          * ok, now we now need to find one on the list of the addresses. We
2514          * can't get one on the emitting interface so let's find first a
2515          * preferred one. If not that an acceptable one otherwise... we
2516          * return NULL.
2517          */
2518         starting_point = inp->next_addr_touse;
2519 once_again:
2520         if (inp->next_addr_touse == NULL) {
2521                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2522                 resettotop = 1;
2523         }
2524         for (laddr = inp->next_addr_touse; laddr;
2525             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2526                 if (laddr->ifa == NULL) {
2527                         /* address has been removed */
2528                         continue;
2529                 }
2530                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2531                         /* address is being deleted */
2532                         continue;
2533                 }
2534                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2535                     dest_is_priv, fam);
2536                 if (sifa == NULL)
2537                         continue;
2538                 atomic_add_int(&sifa->refcount, 1);
2539                 return (sifa);
2540         }
2541         if (resettotop == 0) {
2542                 inp->next_addr_touse = NULL;
2543                 goto once_again;
2544         }
2545         inp->next_addr_touse = starting_point;
2546         resettotop = 0;
2547 once_again_too:
2548         if (inp->next_addr_touse == NULL) {
2549                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2550                 resettotop = 1;
2551         }
2552         /* ok, what about an acceptable address in the inp */
2553         for (laddr = inp->next_addr_touse; laddr;
2554             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2555                 if (laddr->ifa == NULL) {
2556                         /* address has been removed */
2557                         continue;
2558                 }
2559                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2560                         /* address is being deleted */
2561                         continue;
2562                 }
2563                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2564                     dest_is_priv, fam);
2565                 if (sifa == NULL)
2566                         continue;
2567                 atomic_add_int(&sifa->refcount, 1);
2568                 return (sifa);
2569         }
2570         if (resettotop == 0) {
2571                 inp->next_addr_touse = NULL;
2572                 goto once_again_too;
2573         }
2574         /*
2575          * no address bound can be a source for the destination we are in
2576          * trouble
2577          */
2578         return (NULL);
2579 }
2580
2581
2582
2583 static struct sctp_ifa *
2584 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2585     struct sctp_tcb *stcb,
2586     sctp_route_t * ro,
2587     uint32_t vrf_id,
2588     uint8_t dest_is_priv,
2589     uint8_t dest_is_loop,
2590     int non_asoc_addr_ok,
2591     sa_family_t fam)
2592 {
2593         struct sctp_laddr *laddr, *starting_point;
2594         void *ifn;
2595         struct sctp_ifn *sctp_ifn;
2596         struct sctp_ifa *sctp_ifa, *sifa;
2597         uint8_t start_at_beginning = 0;
2598         struct sctp_vrf *vrf;
2599         uint32_t ifn_index;
2600
2601         /*
2602          * first question, is the ifn we will emit on in our list, if so, we
2603          * want that one.
2604          */
2605         vrf = sctp_find_vrf(vrf_id);
2606         if (vrf == NULL)
2607                 return (NULL);
2608
2609         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2610         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2611         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2612
2613         /*
2614          * first question, is the ifn we will emit on in our list?  If so,
2615          * we want that one. First we look for a preferred. Second, we go
2616          * for an acceptable.
2617          */
2618         if (sctp_ifn) {
2619                 /* first try for a preferred address on the ep */
2620                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2621 #ifdef INET
2622                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2623                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2624                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2625                                 continue;
2626                         }
2627 #endif
2628 #ifdef INET6
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2630                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2636                                 continue;
2637                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2638                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2639                                 if (sifa == NULL)
2640                                         continue;
2641                                 if (((non_asoc_addr_ok == 0) &&
2642                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2643                                     (non_asoc_addr_ok &&
2644                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2645                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2646                                         /* on the no-no list */
2647                                         continue;
2648                                 }
2649                                 atomic_add_int(&sifa->refcount, 1);
2650                                 return (sifa);
2651                         }
2652                 }
2653                 /* next try for an acceptable address on the ep */
2654                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2655 #ifdef INET
2656                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2657                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2658                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2659                                 continue;
2660                         }
2661 #endif
2662 #ifdef INET6
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2664                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2670                                 continue;
2671                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2672                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2673                                 if (sifa == NULL)
2674                                         continue;
2675                                 if (((non_asoc_addr_ok == 0) &&
2676                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2677                                     (non_asoc_addr_ok &&
2678                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2679                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2680                                         /* on the no-no list */
2681                                         continue;
2682                                 }
2683                                 atomic_add_int(&sifa->refcount, 1);
2684                                 return (sifa);
2685                         }
2686                 }
2687
2688         }
2689         /*
2690          * if we can't find one like that then we must look at all addresses
2691          * bound to pick one at first preferable then secondly acceptable.
2692          */
2693         starting_point = stcb->asoc.last_used_address;
2694 sctp_from_the_top:
2695         if (stcb->asoc.last_used_address == NULL) {
2696                 start_at_beginning = 1;
2697                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2698         }
2699         /* search beginning with the last used address */
2700         for (laddr = stcb->asoc.last_used_address; laddr;
2701             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2702                 if (laddr->ifa == NULL) {
2703                         /* address has been removed */
2704                         continue;
2705                 }
2706                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2707                         /* address is being deleted */
2708                         continue;
2709                 }
2710                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2711                 if (sifa == NULL)
2712                         continue;
2713                 if (((non_asoc_addr_ok == 0) &&
2714                     (sctp_is_addr_restricted(stcb, sifa))) ||
2715                     (non_asoc_addr_ok &&
2716                     (sctp_is_addr_restricted(stcb, sifa)) &&
2717                     (!sctp_is_addr_pending(stcb, sifa)))) {
2718                         /* on the no-no list */
2719                         continue;
2720                 }
2721                 stcb->asoc.last_used_address = laddr;
2722                 atomic_add_int(&sifa->refcount, 1);
2723                 return (sifa);
2724         }
2725         if (start_at_beginning == 0) {
2726                 stcb->asoc.last_used_address = NULL;
2727                 goto sctp_from_the_top;
2728         }
2729         /* now try for any higher scope than the destination */
2730         stcb->asoc.last_used_address = starting_point;
2731         start_at_beginning = 0;
2732 sctp_from_the_top2:
2733         if (stcb->asoc.last_used_address == NULL) {
2734                 start_at_beginning = 1;
2735                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2736         }
2737         /* search beginning with the last used address */
2738         for (laddr = stcb->asoc.last_used_address; laddr;
2739             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2740                 if (laddr->ifa == NULL) {
2741                         /* address has been removed */
2742                         continue;
2743                 }
2744                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2745                         /* address is being deleted */
2746                         continue;
2747                 }
2748                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2749                     dest_is_priv, fam);
2750                 if (sifa == NULL)
2751                         continue;
2752                 if (((non_asoc_addr_ok == 0) &&
2753                     (sctp_is_addr_restricted(stcb, sifa))) ||
2754                     (non_asoc_addr_ok &&
2755                     (sctp_is_addr_restricted(stcb, sifa)) &&
2756                     (!sctp_is_addr_pending(stcb, sifa)))) {
2757                         /* on the no-no list */
2758                         continue;
2759                 }
2760                 stcb->asoc.last_used_address = laddr;
2761                 atomic_add_int(&sifa->refcount, 1);
2762                 return (sifa);
2763         }
2764         if (start_at_beginning == 0) {
2765                 stcb->asoc.last_used_address = NULL;
2766                 goto sctp_from_the_top2;
2767         }
2768         return (NULL);
2769 }
2770
2771 static struct sctp_ifa *
2772 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2773     struct sctp_inpcb *inp,
2774     struct sctp_tcb *stcb,
2775     int non_asoc_addr_ok,
2776     uint8_t dest_is_loop,
2777     uint8_t dest_is_priv,
2778     int addr_wanted,
2779     sa_family_t fam,
2780     sctp_route_t * ro
2781 )
2782 {
2783         struct sctp_ifa *ifa, *sifa;
2784         int num_eligible_addr = 0;
2785
2786 #ifdef INET6
2787         struct sockaddr_in6 sin6, lsa6;
2788
2789         if (fam == AF_INET6) {
2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791                 (void)sa6_recoverscope(&sin6);
2792         }
2793 #endif                          /* INET6 */
2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798                     &ifa->address.sin.sin_addr) != 0)) {
2799                         continue;
2800                 }
2801 #endif
2802 #ifdef INET6
2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805                     &ifa->address.sin6.sin6_addr) != 0)) {
2806                         continue;
2807                 }
2808 #endif
2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810                     (non_asoc_addr_ok == 0))
2811                         continue;
2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813                     dest_is_priv, fam);
2814                 if (sifa == NULL)
2815                         continue;
2816 #ifdef INET6
2817                 if (fam == AF_INET6 &&
2818                     dest_is_loop &&
2819                     sifa->src_is_loop && sifa->src_is_priv) {
2820                         /*
2821                          * don't allow fe80::1 to be a src on loop ::1, we
2822                          * don't list it to the peer so we will get an
2823                          * abort.
2824                          */
2825                         continue;
2826                 }
2827                 if (fam == AF_INET6 &&
2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830                         /*
2831                          * link-local <-> link-local must belong to the same
2832                          * scope.
2833                          */
2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835                         (void)sa6_recoverscope(&lsa6);
2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837                                 continue;
2838                         }
2839                 }
2840 #endif                          /* INET6 */
2841
2842                 /*
2843                  * Check if the IPv6 address matches to next-hop. In the
2844                  * mobile case, old IPv6 address may be not deleted from the
2845                  * interface. Then, the interface has previous and new
2846                  * addresses.  We should use one corresponding to the
2847                  * next-hop.  (by micchie)
2848                  */
2849 #ifdef INET6
2850                 if (stcb && fam == AF_INET6 &&
2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853                             == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858 #ifdef INET
2859                 /* Avoid topologically incorrect IPv4 address */
2860                 if (stcb && fam == AF_INET &&
2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863                                 continue;
2864                         }
2865                 }
2866 #endif
2867                 if (stcb) {
2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869                                 continue;
2870                         }
2871                         if (((non_asoc_addr_ok == 0) &&
2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
2873                             (non_asoc_addr_ok &&
2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
2876                                 /*
2877                                  * It is restricted for some reason..
2878                                  * probably not yet added.
2879                                  */
2880                                 continue;
2881                         }
2882                 }
2883                 if (num_eligible_addr >= addr_wanted) {
2884                         return (sifa);
2885                 }
2886                 num_eligible_addr++;
2887         }
2888         return (NULL);
2889 }
2890
2891
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901         struct sctp_ifa *ifa, *sifa;
2902         int num_eligible_addr = 0;
2903
2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908                     &ifa->address.sin.sin_addr) != 0)) {
2909                         continue;
2910                 }
2911 #endif
2912 #ifdef INET6
2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2914                     (stcb != NULL) &&
2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916                     &ifa->address.sin6.sin6_addr) != 0)) {
2917                         continue;
2918                 }
2919 #endif
2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921                     (non_asoc_addr_ok == 0)) {
2922                         continue;
2923                 }
2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925                     dest_is_priv, fam);
2926                 if (sifa == NULL) {
2927                         continue;
2928                 }
2929                 if (stcb) {
2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931                                 continue;
2932                         }
2933                         if (((non_asoc_addr_ok == 0) &&
2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
2935                             (non_asoc_addr_ok &&
2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
2938                                 /*
2939                                  * It is restricted for some reason..
2940                                  * probably not yet added.
2941                                  */
2942                                 continue;
2943                         }
2944                 }
2945                 num_eligible_addr++;
2946         }
2947         return (num_eligible_addr);
2948 }
2949
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t * ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961         int cur_addr_num = 0, num_preferred = 0;
2962         void *ifn;
2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964         struct sctp_ifa *sctp_ifa, *sifa;
2965         uint32_t ifn_index;
2966         struct sctp_vrf *vrf;
2967
2968 #ifdef INET
2969         int retried = 0;
2970
2971 #endif
2972
2973         /*-
2974          * For boundall we can use any address in the association.
2975          * If non_asoc_addr_ok is set we can use any address (at least in
2976          * theory). So we look for preferred addresses first. If we find one,
2977          * we use it. Otherwise we next try to get an address on the
2978          * interface, which we should be able to do (unless non_asoc_addr_ok
2979          * is false and we are routed out that way). In these cases where we
2980          * can't use the address of the interface we go through all the
2981          * ifn's looking for an address we can use and fill that in. Punting
2982          * means we send back address 0, which will probably cause problems
2983          * actually since then IP will fill in the address of the route ifn,
2984          * which means we probably already rejected it.. i.e. here comes an
2985          * abort :-<.
2986          */
2987         vrf = sctp_find_vrf(vrf_id);
2988         if (vrf == NULL)
2989                 return (NULL);
2990
2991         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2992         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2993         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2994         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2995         if (sctp_ifn == NULL) {
2996                 /* ?? We don't have this guy ?? */
2997                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2998                 goto bound_all_plan_b;
2999         }
3000         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3001             ifn_index, sctp_ifn->ifn_name);
3002
3003         if (net) {
3004                 cur_addr_num = net->indx_of_eligible_next_to_use;
3005         }
3006         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3007             inp, stcb,
3008             non_asoc_addr_ok,
3009             dest_is_loop,
3010             dest_is_priv, fam);
3011         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3012             num_preferred, sctp_ifn->ifn_name);
3013         if (num_preferred == 0) {
3014                 /*
3015                  * no eligible addresses, we must use some other interface
3016                  * address if we can find one.
3017                  */
3018                 goto bound_all_plan_b;
3019         }
3020         /*
3021          * Ok we have num_eligible_addr set with how many we can use, this
3022          * may vary from call to call due to addresses being deprecated
3023          * etc..
3024          */
3025         if (cur_addr_num >= num_preferred) {
3026                 cur_addr_num = 0;
3027         }
3028         /*
3029          * select the nth address from the list (where cur_addr_num is the
3030          * nth) and 0 is the first one, 1 is the second one etc...
3031          */
3032         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3033
3034         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3035             dest_is_priv, cur_addr_num, fam, ro);
3036
3037         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3038         if (sctp_ifa) {
3039                 atomic_add_int(&sctp_ifa->refcount, 1);
3040                 if (net) {
3041                         /* save off where the next one we will want */
3042                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3043                 }
3044                 return (sctp_ifa);
3045         }
3046         /*
3047          * plan_b: Look at all interfaces and find a preferred address. If
3048          * no preferred fall through to plan_c.
3049          */
3050 bound_all_plan_b:
3051         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3052         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3054                     sctp_ifn->ifn_name);
3055                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3056                         /* wrong base scope */
3057                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3058                         continue;
3059                 }
3060                 if ((sctp_ifn == looked_at) && looked_at) {
3061                         /* already looked at this guy */
3062                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3063                         continue;
3064                 }
3065                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3066                     dest_is_loop, dest_is_priv, fam);
3067                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3068                     "Found ifn:%p %d preferred source addresses\n",
3069                     ifn, num_preferred);
3070                 if (num_preferred == 0) {
3071                         /* None on this interface. */
3072                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3073                         continue;
3074                 }
3075                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3076                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3077                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3078
3079                 /*
3080                  * Ok we have num_eligible_addr set with how many we can
3081                  * use, this may vary from call to call due to addresses
3082                  * being deprecated etc..
3083                  */
3084                 if (cur_addr_num >= num_preferred) {
3085                         cur_addr_num = 0;
3086                 }
3087                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3088                     dest_is_priv, cur_addr_num, fam, ro);
3089                 if (sifa == NULL)
3090                         continue;
3091                 if (net) {
3092                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3094                             cur_addr_num);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3099                 }
3100                 atomic_add_int(&sifa->refcount, 1);
3101                 return (sifa);
3102         }
3103 #ifdef INET
3104 again_with_private_addresses_allowed:
3105 #endif
3106         /* plan_c: do we have an acceptable address on the emit interface */
3107         sifa = NULL;
3108         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3109         if (emit_ifn == NULL) {
3110                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3111                 goto plan_d;
3112         }
3113         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3115 #ifdef INET
3116                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3117                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3118                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3119                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3120                         continue;
3121                 }
3122 #endif
3123 #ifdef INET6
3124                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3125                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3126                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3127                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3128                         continue;
3129                 }
3130 #endif
3131                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3132                     (non_asoc_addr_ok == 0)) {
3133                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3134                         continue;
3135                 }
3136                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3137                     dest_is_priv, fam);
3138                 if (sifa == NULL) {
3139                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3140                         continue;
3141                 }
3142                 if (stcb) {
3143                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3144                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3145                                 sifa = NULL;
3146                                 continue;
3147                         }
3148                         if (((non_asoc_addr_ok == 0) &&
3149                             (sctp_is_addr_restricted(stcb, sifa))) ||
3150                             (non_asoc_addr_ok &&
3151                             (sctp_is_addr_restricted(stcb, sifa)) &&
3152                             (!sctp_is_addr_pending(stcb, sifa)))) {
3153                                 /*
3154                                  * It is restricted for some reason..
3155                                  * probably not yet added.
3156                                  */
3157                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3158                                 sifa = NULL;
3159                                 continue;
3160                         }
3161                 } else {
3162                         SCTP_PRINTF("Stcb is null - no print\n");
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226                 stcb->asoc.scope.ipv4_local_scope = 1;
3227                 retried = 1;
3228                 goto again_with_private_addresses_allowed;
3229         } else if (retried == 1) {
3230                 stcb->asoc.scope.ipv4_local_scope = 0;
3231         }
3232 #endif
3233 out:
3234 #ifdef INET
3235         if (sifa) {
3236                 if (retried == 1) {
3237                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239                                         /* wrong base scope */
3240                                         continue;
3241                                 }
3242                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243                                         struct sctp_ifa *tmp_sifa;
3244
3245 #ifdef INET
3246                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3249                                                 continue;
3250                                         }
3251 #endif
3252 #ifdef INET6
3253                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256                                                 continue;
3257                                         }
3258 #endif
3259                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260                                             (non_asoc_addr_ok == 0))
3261                                                 continue;
3262                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263                                             dest_is_loop,
3264                                             dest_is_priv, fam);
3265                                         if (tmp_sifa == NULL) {
3266                                                 continue;
3267                                         }
3268                                         if (tmp_sifa == sifa) {
3269                                                 continue;
3270                                         }
3271                                         if (stcb) {
3272                                                 if (sctp_is_address_in_scope(tmp_sifa,
3273                                                     &stcb->asoc.scope, 0) == 0) {
3274                                                         continue;
3275                                                 }
3276                                                 if (((non_asoc_addr_ok == 0) &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278                                                     (non_asoc_addr_ok &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281                                                         /*
3282                                                          * It is restricted
3283                                                          * for some reason..
3284                                                          * probably not yet
3285                                                          * added.
3286                                                          */
3287                                                         continue;
3288                                                 }
3289                                         }
3290                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293                                         }
3294                                 }
3295                         }
3296                 }
3297                 atomic_add_int(&sifa->refcount, 1);
3298         }
3299 #endif
3300         return (sifa);
3301 }
3302
3303
3304
3305 /* tcb may be NULL */
3306 struct sctp_ifa *
3307 sctp_source_address_selection(struct sctp_inpcb *inp,
3308     struct sctp_tcb *stcb,
3309     sctp_route_t * ro,
3310     struct sctp_nets *net,
3311     int non_asoc_addr_ok, uint32_t vrf_id)
3312 {
3313         struct sctp_ifa *answer;
3314         uint8_t dest_is_priv, dest_is_loop;
3315         sa_family_t fam;
3316
3317 #ifdef INET
3318         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319
3320 #endif
3321 #ifdef INET6
3322         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323
3324 #endif
3325
3326         /**
3327          * Rules: - Find the route if needed, cache if I can. - Look at
3328          * interface address in route, Is it in the bound list. If so we
3329          * have the best source. - If not we must rotate amongst the
3330          * addresses.
3331          *
3332          * Cavets and issues
3333          *
3334          * Do we need to pay attention to scope. We can have a private address
3335          * or a global address we are sourcing or sending to. So if we draw
3336          * it out
3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338          * For V4
3339          * ------------------------------------------
3340          *      source     *      dest  *  result
3341          * -----------------------------------------
3342          * <a>  Private    *    Global  *  NAT
3343          * -----------------------------------------
3344          * <b>  Private    *    Private *  No problem
3345          * -----------------------------------------
3346          * <c>  Global     *    Private *  Huh, How will this work?
3347          * -----------------------------------------
3348          * <d>  Global     *    Global  *  No Problem
3349          *------------------------------------------
3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351          * For V6
3352          *------------------------------------------
3353          *      source     *      dest  *  result
3354          * -----------------------------------------
3355          * <a>  Linklocal  *    Global  *
3356          * -----------------------------------------
3357          * <b>  Linklocal  * Linklocal  *  No problem
3358          * -----------------------------------------
3359          * <c>  Global     * Linklocal  *  Huh, How will this work?
3360          * -----------------------------------------
3361          * <d>  Global     *    Global  *  No Problem
3362          *------------------------------------------
3363          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364          *
3365          * And then we add to that what happens if there are multiple addresses
3366          * assigned to an interface. Remember the ifa on a ifn is a linked
3367          * list of addresses. So one interface can have more than one IP
3368          * address. What happens if we have both a private and a global
3369          * address? Do we then use context of destination to sort out which
3370          * one is best? And what about NAT's sending P->G may get you a NAT
3371          * translation, or should you select the G thats on the interface in
3372          * preference.
3373          *
3374          * Decisions:
3375          *
3376          * - count the number of addresses on the interface.
3377          * - if it is one, no problem except case <c>.
3378          *   For <a> we will assume a NAT out there.
3379          * - if there are more than one, then we need to worry about scope P
3380          *   or G. We should prefer G -> G and P -> P if possible.
3381          *   Then as a secondary fall back to mixed types G->P being a last
3382          *   ditch one.
3383          * - The above all works for bound all, but bound specific we need to
3384          *   use the same concept but instead only consider the bound
3385          *   addresses. If the bound set is NOT assigned to the interface then
3386          *   we must use rotation amongst the bound addresses..
3387          */
3388         if (ro->ro_rt == NULL) {
3389                 /*
3390                  * Need a route to cache.
3391                  */
3392                 SCTP_RTALLOC(ro, vrf_id);
3393         }
3394         if (ro->ro_rt == NULL) {
3395                 return (NULL);
3396         }
3397         fam = ro->ro_dst.sa_family;
3398         dest_is_priv = dest_is_loop = 0;
3399         /* Setup our scopes for the destination */
3400         switch (fam) {
3401 #ifdef INET
3402         case AF_INET:
3403                 /* Scope based on outbound address */
3404                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405                         dest_is_loop = 1;
3406                         if (net != NULL) {
3407                                 /* mark it as local */
3408                                 net->addr_is_local = 1;
3409                         }
3410                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411                         dest_is_priv = 1;
3412                 }
3413                 break;
3414 #endif
3415 #ifdef INET6
3416         case AF_INET6:
3417                 /* Scope based on outbound address */
3418                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420                         /*
3421                          * If the address is a loopback address, which
3422                          * consists of "::1" OR "fe80::1%lo0", we are
3423                          * loopback scope. But we don't use dest_is_priv
3424                          * (link local addresses).
3425                          */
3426                         dest_is_loop = 1;
3427                         if (net != NULL) {
3428                                 /* mark it as local */
3429                                 net->addr_is_local = 1;
3430                         }
3431                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432                         dest_is_priv = 1;
3433                 }
3434                 break;
3435 #endif
3436         }
3437         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439         SCTP_IPI_ADDR_RLOCK();
3440         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441                 /*
3442                  * Bound all case
3443                  */
3444                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445                     dest_is_priv, dest_is_loop,
3446                     non_asoc_addr_ok, fam);
3447                 SCTP_IPI_ADDR_RUNLOCK();
3448                 return (answer);
3449         }
3450         /*
3451          * Subset bound case
3452          */
3453         if (stcb) {
3454                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455                     vrf_id, dest_is_priv,
3456                     dest_is_loop,
3457                     non_asoc_addr_ok, fam);
3458         } else {
3459                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460                     non_asoc_addr_ok,
3461                     dest_is_priv,
3462                     dest_is_loop, fam);
3463         }
3464         SCTP_IPI_ADDR_RUNLOCK();
3465         return (answer);
3466 }
3467
3468 static int
3469 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470 {
3471         struct cmsghdr cmh;
3472         int tlen, at, found;
3473         struct sctp_sndinfo sndinfo;
3474         struct sctp_prinfo prinfo;
3475         struct sctp_authinfo authinfo;
3476
3477         tlen = SCTP_BUF_LEN(control);
3478         at = 0;
3479         found = 0;
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         while (at < tlen) {
3485                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3486                         /* There is not enough room for one more. */
3487                         return (found);
3488                 }
3489                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3490                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491                         /* We dont't have a complete CMSG header. */
3492                         return (found);
3493                 }
3494                 if (((int)cmh.cmsg_len + at) > tlen) {
3495                         /* We don't have the complete CMSG. */
3496                         return (found);
3497                 }
3498                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3499                     ((c_type == cmh.cmsg_type) ||
3500                     ((c_type == SCTP_SNDRCV) &&
3501                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3502                     (cmh.cmsg_type == SCTP_PRINFO) ||
3503                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3504                         if (c_type == cmh.cmsg_type) {
3505                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3506                                         return (found);
3507                                 }
3508                                 /* It is exactly what we want. Copy it out. */
3509                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3510                                 return (1);
3511                         } else {
3512                                 struct sctp_sndrcvinfo *sndrcvinfo;
3513
3514                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3515                                 if (found == 0) {
3516                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3517                                                 return (found);
3518                                         }
3519                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3520                                 }
3521                                 switch (cmh.cmsg_type) {
3522                                 case SCTP_SNDINFO:
3523                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3524                                                 return (found);
3525                                         }
3526                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3527                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3528                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3529                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3530                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3531                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3532                                         break;
3533                                 case SCTP_PRINFO:
3534                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3535                                                 return (found);
3536                                         }
3537                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3538                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3539                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3540                                         } else {
3541                                                 sndrcvinfo->sinfo_timetolive = 0;
3542                                         }
3543                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3544                                         break;
3545                                 case SCTP_AUTHINFO:
3546                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3547                                                 return (found);
3548                                         }
3549                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3550                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3551                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3552                                         break;
3553                                 default:
3554                                         return (found);
3555                                 }
3556                                 found = 1;
3557                         }
3558                 }
3559                 at += CMSG_ALIGN(cmh.cmsg_len);
3560         }
3561         return (found);
3562 }
3563
3564 static int
3565 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3566 {
3567         struct cmsghdr cmh;
3568         int tlen, at;
3569         struct sctp_initmsg initmsg;
3570
3571 #ifdef INET
3572         struct sockaddr_in sin;
3573
3574 #endif
3575 #ifdef INET6
3576         struct sockaddr_in6 sin6;
3577
3578 #endif
3579
3580         tlen = SCTP_BUF_LEN(control);
3581         at = 0;
3582         while (at < tlen) {
3583                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584                         /* There is not enough room for one more. */
3585                         *error = EINVAL;
3586                         return (1);
3587                 }
3588                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590                         /* We dont't have a complete CMSG header. */
3591                         *error = EINVAL;
3592                         return (1);
3593                 }
3594                 if (((int)cmh.cmsg_len + at) > tlen) {
3595                         /* We don't have the complete CMSG. */
3596                         *error = EINVAL;
3597                         return (1);
3598                 }
3599                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3600                         switch (cmh.cmsg_type) {
3601                         case SCTP_INIT:
3602                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603                                         *error = EINVAL;
3604                                         return (1);
3605                                 }
3606                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607                                 if (initmsg.sinit_max_attempts)
3608                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609                                 if (initmsg.sinit_num_ostreams)
3610                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611                                 if (initmsg.sinit_max_instreams)
3612                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613                                 if (initmsg.sinit_max_init_timeo)
3614                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616                                         struct sctp_stream_out *tmp_str;
3617                                         unsigned int i;
3618
3619                                         /* Default is NOT correct */
3620                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3621                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3622                                         SCTP_TCB_UNLOCK(stcb);
3623                                         SCTP_MALLOC(tmp_str,
3624                                             struct sctp_stream_out *,
3625                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3626                                             SCTP_M_STRMO);
3627                                         SCTP_TCB_LOCK(stcb);
3628                                         if (tmp_str != NULL) {
3629                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3630                                                 stcb->asoc.strmout = tmp_str;
3631                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3632                                         } else {
3633                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3634                                         }
3635                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3636                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3637                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3638                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3639                                                 stcb->asoc.strmout[i].stream_no = i;
3640                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3641                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3642                                         }
3643                                 }
3644                                 break;
3645 #ifdef INET
3646                         case SCTP_DSTADDRV4:
3647                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3648                                         *error = EINVAL;
3649                                         return (1);
3650                                 }
3651                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3652                                 sin.sin_family = AF_INET;
3653                                 sin.sin_len = sizeof(struct sockaddr_in);
3654                                 sin.sin_port = stcb->rport;
3655                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3656                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3657                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3658                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3659                                         *error = EINVAL;
3660                                         return (1);
3661                                 }
3662                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3663                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3664                                         *error = ENOBUFS;
3665                                         return (1);
3666                                 }
3667                                 break;
3668 #endif
3669 #ifdef INET6
3670                         case SCTP_DSTADDRV6:
3671                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3672                                         *error = EINVAL;
3673                                         return (1);
3674                                 }
3675                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3676                                 sin6.sin6_family = AF_INET6;
3677                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3678                                 sin6.sin6_port = stcb->rport;
3679                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3680                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3681                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3682                                         *error = EINVAL;
3683                                         return (1);
3684                                 }
3685 #ifdef INET
3686                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3687                                         in6_sin6_2_sin(&sin, &sin6);
3688                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3689                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3690                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3691                                                 *error = EINVAL;
3692                                                 return (1);
3693                                         }
3694                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3695                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3696                                                 *error = ENOBUFS;
3697                                                 return (1);
3698                                         }
3699                                 } else
3700 #endif
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3702                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                         *error = ENOBUFS;
3704                                         return (1);
3705                                 }
3706                                 break;
3707 #endif
3708                         default:
3709                                 break;
3710                         }
3711                 }
3712                 at += CMSG_ALIGN(cmh.cmsg_len);
3713         }
3714         return (0);
3715 }
3716
3717 static struct sctp_tcb *
3718 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3719     uint16_t port,
3720     struct mbuf *control,
3721     struct sctp_nets **net_p,
3722     int *error)
3723 {
3724         struct cmsghdr cmh;
3725         int tlen, at;
3726         struct sctp_tcb *stcb;
3727         struct sockaddr *addr;
3728
3729 #ifdef INET
3730         struct sockaddr_in sin;
3731
3732 #endif
3733 #ifdef INET6
3734         struct sockaddr_in6 sin6;
3735
3736 #endif
3737
3738         tlen = SCTP_BUF_LEN(control);
3739         at = 0;
3740         while (at < tlen) {
3741                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3742                         /* There is not enough room for one more. */
3743                         *error = EINVAL;
3744                         return (NULL);
3745                 }
3746                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3747                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3748                         /* We dont't have a complete CMSG header. */
3749                         *error = EINVAL;
3750                         return (NULL);
3751                 }
3752                 if (((int)cmh.cmsg_len + at) > tlen) {
3753                         /* We don't have the complete CMSG. */
3754                         *error = EINVAL;
3755                         return (NULL);
3756                 }
3757                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3758                         switch (cmh.cmsg_type) {
3759 #ifdef INET
3760                         case SCTP_DSTADDRV4:
3761                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3762                                         *error = EINVAL;
3763                                         return (NULL);
3764                                 }
3765                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3766                                 sin.sin_family = AF_INET;
3767                                 sin.sin_len = sizeof(struct sockaddr_in);
3768                                 sin.sin_port = port;
3769                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3770                                 addr = (struct sockaddr *)&sin;
3771                                 break;
3772 #endif
3773 #ifdef INET6
3774                         case SCTP_DSTADDRV6:
3775                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3776                                         *error = EINVAL;
3777                                         return (NULL);
3778                                 }
3779                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3780                                 sin6.sin6_family = AF_INET6;
3781                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3782                                 sin6.sin6_port = port;
3783                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3784 #ifdef INET
3785                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3786                                         in6_sin6_2_sin(&sin, &sin6);
3787                                         addr = (struct sockaddr *)&sin;
3788                                 } else
3789 #endif
3790                                         addr = (struct sockaddr *)&sin6;
3791                                 break;
3792 #endif
3793                         default:
3794                                 addr = NULL;
3795                                 break;
3796                         }
3797                         if (addr) {
3798                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3799                                 if (stcb != NULL) {
3800                                         return (stcb);
3801                                 }
3802                         }
3803                 }
3804                 at += CMSG_ALIGN(cmh.cmsg_len);
3805         }
3806         return (NULL);
3807 }
3808
3809 static struct mbuf *
3810 sctp_add_cookie(struct mbuf *init, int init_offset,
3811     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3812 {
3813         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3814         struct sctp_state_cookie *stc;
3815         struct sctp_paramhdr *ph;
3816         uint8_t *foo;
3817         int sig_offset;
3818         uint16_t cookie_sz;
3819
3820         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3821             sizeof(struct sctp_paramhdr)), 0,
3822             M_DONTWAIT, 1, MT_DATA);
3823         if (mret == NULL) {
3824                 return (NULL);
3825         }
3826         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3827         if (copy_init == NULL) {
3828                 sctp_m_freem(mret);
3829                 return (NULL);
3830         }
3831 #ifdef SCTP_MBUF_LOGGING
3832         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3833                 struct mbuf *mat;
3834
3835                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3836                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3837                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3838                         }
3839                 }
3840         }
3841 #endif
3842         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3843             M_DONTWAIT);
3844         if (copy_initack == NULL) {
3845                 sctp_m_freem(mret);
3846                 sctp_m_freem(copy_init);
3847                 return (NULL);
3848         }
3849 #ifdef SCTP_MBUF_LOGGING
3850         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3851                 struct mbuf *mat;
3852
3853                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3854                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3855                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3856                         }
3857                 }
3858         }
3859 #endif
3860         /* easy side we just drop it on the end */
3861         ph = mtod(mret, struct sctp_paramhdr *);
3862         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3863             sizeof(struct sctp_paramhdr);
3864         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3865             sizeof(struct sctp_paramhdr));
3866         ph->param_type = htons(SCTP_STATE_COOKIE);
3867         ph->param_length = 0;   /* fill in at the end */
3868         /* Fill in the stc cookie data */
3869         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3870
3871         /* tack the INIT and then the INIT-ACK onto the chain */
3872         cookie_sz = 0;
3873         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3874                 cookie_sz += SCTP_BUF_LEN(m_at);
3875                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3876                         SCTP_BUF_NEXT(m_at) = copy_init;
3877                         break;
3878                 }
3879         }
3880         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_initack;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         break;
3891                 }
3892         }
3893         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3894         if (sig == NULL) {
3895                 /* no space, so free the entire chain */
3896                 sctp_m_freem(mret);
3897                 return (NULL);
3898         }
3899         SCTP_BUF_LEN(sig) = 0;
3900         SCTP_BUF_NEXT(m_at) = sig;
3901         sig_offset = 0;
3902         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3903         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3904         *signature = foo;
3905         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3906         cookie_sz += SCTP_SIGNATURE_SIZE;
3907         ph->param_length = htons(cookie_sz);
3908         return (mret);
3909 }
3910
3911
3912 static uint8_t
3913 sctp_get_ect(struct sctp_tcb *stcb)
3914 {
3915         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3916                 return (SCTP_ECT0_BIT);
3917         } else {
3918                 return (0);
3919         }
3920 }
3921
3922 #if defined(INET) || defined(INET6)
3923 static void
3924 sctp_handle_no_route(struct sctp_tcb *stcb,
3925     struct sctp_nets *net,
3926     int so_locked)
3927 {
3928         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3929
3930         if (net) {
3931                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3932                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3933                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3934                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3935                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3936                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3937                                     stcb, 0,
3938                                     (void *)net,
3939                                     so_locked);
3940                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3941                                 net->dest_state &= ~SCTP_ADDR_PF;
3942                         }
3943                 }
3944                 if (stcb) {
3945                         if (net == stcb->asoc.primary_destination) {
3946                                 /* need a new primary */
3947                                 struct sctp_nets *alt;
3948
3949                                 alt = sctp_find_alternate_net(stcb, net, 0);
3950                                 if (alt != net) {
3951                                         if (stcb->asoc.alternate) {
3952                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3953                                         }
3954                                         stcb->asoc.alternate = alt;
3955                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3956                                         if (net->ro._s_addr) {
3957                                                 sctp_free_ifa(net->ro._s_addr);
3958                                                 net->ro._s_addr = NULL;
3959                                         }
3960                                         net->src_addr_selected = 0;
3961                                 }
3962                         }
3963                 }
3964         }
3965 }
3966
3967 #endif
3968
3969 static int
3970 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3971     struct sctp_tcb *stcb,      /* may be NULL */
3972     struct sctp_nets *net,
3973     struct sockaddr *to,
3974     struct mbuf *m,
3975     uint32_t auth_offset,
3976     struct sctp_auth_chunk *auth,
3977     uint16_t auth_keyid,
3978     int nofragment_flag,
3979     int ecn_ok,
3980     int out_of_asoc_ok,
3981     uint16_t src_port,
3982     uint16_t dest_port,
3983     uint32_t v_tag,
3984     uint16_t port,
3985     union sctp_sockstore *over_addr,
3986     uint8_t use_mflowid, uint32_t mflowid,
3987 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3988     int so_locked SCTP_UNUSED
3989 #else
3990     int so_locked
3991 #endif
3992 )
3993 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3994 {
3995         /**
3996          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3997          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3998          * - fill in the HMAC digest of any AUTH chunk in the packet.
3999          * - calculate and fill in the SCTP checksum.
4000          * - prepend an IP address header.
4001          * - if boundall use INADDR_ANY.
4002          * - if boundspecific do source address selection.
4003          * - set fragmentation option for ipV4.
4004          * - On return from IP output, check/adjust mtu size of output
4005          *   interface and smallest_mtu size as well.
4006          */
4007         /* Will need ifdefs around this */
4008         struct mbuf *newm;
4009         struct sctphdr *sctphdr;
4010         int packet_length;
4011         int ret;
4012
4013 #if defined(INET) || defined(INET6)
4014         uint32_t vrf_id;
4015
4016 #endif
4017 #if defined(INET) || defined(INET6)
4018         struct mbuf *o_pak;
4019         sctp_route_t *ro = NULL;
4020         struct udphdr *udp = NULL;
4021
4022 #endif
4023         uint8_t tos_value;
4024
4025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4026         struct socket *so = NULL;
4027
4028 #endif
4029
4030         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4031                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4032                 sctp_m_freem(m);
4033                 return (EFAULT);
4034         }
4035 #if defined(INET) || defined(INET6)
4036         if (stcb) {
4037                 vrf_id = stcb->asoc.vrf_id;
4038         } else {
4039                 vrf_id = inp->def_vrf_id;
4040         }
4041 #endif
4042         /* fill in the HMAC digest for any AUTH chunk in the packet */
4043         if ((auth != NULL) && (stcb != NULL)) {
4044                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4045         }
4046         if (net) {
4047                 tos_value = net->dscp;
4048         } else if (stcb) {
4049                 tos_value = stcb->asoc.default_dscp;
4050         } else {
4051                 tos_value = inp->sctp_ep.default_dscp;
4052         }
4053
4054         switch (to->sa_family) {
4055 #ifdef INET
4056         case AF_INET:
4057                 {
4058                         struct ip *ip = NULL;
4059                         sctp_route_t iproute;
4060                         int len;
4061
4062                         len = sizeof(struct ip) + sizeof(struct sctphdr);
4063                         if (port) {
4064                                 len += sizeof(struct udphdr);
4065                         }
4066                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4067                         if (newm == NULL) {
4068                                 sctp_m_freem(m);
4069                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4070                                 return (ENOMEM);
4071                         }
4072                         SCTP_ALIGN_TO_END(newm, len);
4073                         SCTP_BUF_LEN(newm) = len;
4074                         SCTP_BUF_NEXT(newm) = m;
4075                         m = newm;
4076                         if (net != NULL) {
4077 #ifdef INVARIANTS
4078                                 if (net->flowidset == 0) {
4079                                         panic("Flow ID not set");
4080                                 }
4081 #endif
4082                                 m->m_pkthdr.flowid = net->flowid;
4083                                 m->m_flags |= M_FLOWID;
4084                         } else {
4085                                 if (use_mflowid != 0) {
4086                                         m->m_pkthdr.flowid = mflowid;
4087                                         m->m_flags |= M_FLOWID;
4088                                 }
4089                         }
4090                         packet_length = sctp_calculate_len(m);
4091                         ip = mtod(m, struct ip *);
4092                         ip->ip_v = IPVERSION;
4093                         ip->ip_hl = (sizeof(struct ip) >> 2);
4094                         if (tos_value == 0) {
4095                                 /*
4096                                  * This means especially, that it is not set
4097                                  * at the SCTP layer. So use the value from
4098                                  * the IP layer.
4099                                  */
4100                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4101                         }
4102                         tos_value &= 0xfc;
4103                         if (ecn_ok) {
4104                                 tos_value |= sctp_get_ect(stcb);
4105                         }
4106                         if ((nofragment_flag) && (port == 0)) {
4107                                 ip->ip_off = IP_DF;
4108                         } else {
4109                                 ip->ip_off = 0;
4110                         }
4111                         /* FreeBSD has a function for ip_id's */
4112                         ip->ip_id = ip_newid();
4113
4114                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4115                         ip->ip_len = packet_length;
4116                         ip->ip_tos = tos_value;
4117                         if (port) {
4118                                 ip->ip_p = IPPROTO_UDP;
4119                         } else {
4120                                 ip->ip_p = IPPROTO_SCTP;
4121                         }
4122                         ip->ip_sum = 0;
4123                         if (net == NULL) {
4124                                 ro = &iproute;
4125                                 memset(&iproute, 0, sizeof(iproute));
4126                                 memcpy(&ro->ro_dst, to, to->sa_len);
4127                         } else {
4128                                 ro = (sctp_route_t *) & net->ro;
4129                         }
4130                         /* Now the address selection part */
4131                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4132
4133                         /* call the routine to select the src address */
4134                         if (net && out_of_asoc_ok == 0) {
4135                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4136                                         sctp_free_ifa(net->ro._s_addr);
4137                                         net->ro._s_addr = NULL;
4138                                         net->src_addr_selected = 0;
4139                                         if (ro->ro_rt) {
4140                                                 RTFREE(ro->ro_rt);
4141                                                 ro->ro_rt = NULL;
4142                                         }
4143                                 }
4144                                 if (net->src_addr_selected == 0) {
4145                                         /* Cache the source address */
4146                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4147                                             ro, net, 0,
4148                                             vrf_id);
4149                                         net->src_addr_selected = 1;
4150                                 }
4151                                 if (net->ro._s_addr == NULL) {
4152                                         /* No route to host */
4153                                         net->src_addr_selected = 0;
4154                                         sctp_handle_no_route(stcb, net, so_locked);
4155                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4156                                         sctp_m_freem(m);
4157                                         return (EHOSTUNREACH);
4158                                 }
4159                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4160                         } else {
4161                                 if (over_addr == NULL) {
4162                                         struct sctp_ifa *_lsrc;
4163
4164                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4165                                             net,
4166                                             out_of_asoc_ok,
4167                                             vrf_id);
4168                                         if (_lsrc == NULL) {
4169                                                 sctp_handle_no_route(stcb, net, so_locked);
4170                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4171                                                 sctp_m_freem(m);
4172                                                 return (EHOSTUNREACH);
4173                                         }
4174                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4175                                         sctp_free_ifa(_lsrc);
4176                                 } else {
4177                                         ip->ip_src = over_addr->sin.sin_addr;
4178                                         SCTP_RTALLOC(ro, vrf_id);
4179                                 }
4180                         }
4181                         if (port) {
4182                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4183                                         sctp_handle_no_route(stcb, net, so_locked);
4184                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4185                                         sctp_m_freem(m);
4186                                         return (EHOSTUNREACH);
4187                                 }
4188                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4189                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4190                                 udp->uh_dport = port;
4191                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4192                                 if (V_udp_cksum) {
4193                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4194                                 } else {
4195                                         udp->uh_sum = 0;
4196                                 }
4197                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4198                         } else {
4199                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4200                         }
4201
4202                         sctphdr->src_port = src_port;
4203                         sctphdr->dest_port = dest_port;
4204                         sctphdr->v_tag = v_tag;
4205                         sctphdr->checksum = 0;
4206
4207                         /*
4208                          * If source address selection fails and we find no
4209                          * route then the ip_output should fail as well with
4210                          * a NO_ROUTE_TO_HOST type error. We probably should
4211                          * catch that somewhere and abort the association
4212                          * right away (assuming this is an INIT being sent).
4213                          */
4214                         if (ro->ro_rt == NULL) {
4215                                 /*
4216                                  * src addr selection failed to find a route
4217                                  * (or valid source addr), so we can't get
4218                                  * there from here (yet)!
4219                                  */
4220                                 sctp_handle_no_route(stcb, net, so_locked);
4221                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4222                                 sctp_m_freem(m);
4223                                 return (EHOSTUNREACH);
4224                         }
4225                         if (ro != &iproute) {
4226                                 memcpy(&iproute, ro, sizeof(*ro));
4227                         }
4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4229                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4230                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4231                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4232                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4233                             (void *)ro->ro_rt);
4234
4235                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4236                                 /* failed to prepend data, give up */
4237                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4238                                 sctp_m_freem(m);
4239                                 return (ENOMEM);
4240                         }
4241                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4242                         if (port) {
4243 #if defined(SCTP_WITH_NO_CSUM)
4244                                 SCTP_STAT_INCR(sctps_sendnocrc);
4245 #else
4246                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4247                                 SCTP_STAT_INCR(sctps_sendswcrc);
4248 #endif
4249                                 if (V_udp_cksum) {
4250                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4251                                 }
4252                         } else {
4253 #if defined(SCTP_WITH_NO_CSUM)
4254                                 SCTP_STAT_INCR(sctps_sendnocrc);
4255 #else
4256                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4257                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4258                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4259 #endif
4260                         }
4261 #ifdef SCTP_PACKET_LOGGING
4262                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4263                                 sctp_packet_log(o_pak);
4264 #endif
4265                         /* send it out.  table id is taken from stcb */
4266 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4267                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4268                                 so = SCTP_INP_SO(inp);
4269                                 SCTP_SOCKET_UNLOCK(so, 0);
4270                         }
4271 #endif
4272                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4273 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4274                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4275                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4276                                 SCTP_TCB_UNLOCK(stcb);
4277                                 SCTP_SOCKET_LOCK(so, 0);
4278                                 SCTP_TCB_LOCK(stcb);
4279                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4280                         }
4281 #endif
4282                         SCTP_STAT_INCR(sctps_sendpackets);
4283                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4284                         if (ret)
4285                                 SCTP_STAT_INCR(sctps_senderrors);
4286
4287                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4288                         if (net == NULL) {
4289                                 /* free tempy routes */
4290                                 RO_RTFREE(ro);
4291                         } else {
4292                                 /*
4293                                  * PMTU check versus smallest asoc MTU goes
4294                                  * here
4295                                  */
4296                                 if ((ro->ro_rt != NULL) &&
4297                                     (net->ro._s_addr)) {
4298                                         uint32_t mtu;
4299
4300                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4301                                         if (net->port) {
4302                                                 mtu -= sizeof(struct udphdr);
4303                                         }
4304                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4305                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4306                                                 net->mtu = mtu;
4307                                         }
4308                                 } else if (ro->ro_rt == NULL) {
4309                                         /* route was freed */
4310                                         if (net->ro._s_addr &&
4311                                             net->src_addr_selected) {
4312                                                 sctp_free_ifa(net->ro._s_addr);
4313                                                 net->ro._s_addr = NULL;
4314                                         }
4315                                         net->src_addr_selected = 0;
4316                                 }
4317                         }
4318                         return (ret);
4319                 }
4320 #endif
4321 #ifdef INET6
4322         case AF_INET6:
4323                 {
4324                         uint32_t flowlabel, flowinfo;
4325                         struct ip6_hdr *ip6h;
4326                         struct route_in6 ip6route;
4327                         struct ifnet *ifp;
4328                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4329                         int prev_scope = 0;
4330                         struct sockaddr_in6 lsa6_storage;
4331                         int error;
4332                         u_short prev_port = 0;
4333                         int len;
4334
4335                         if (net) {
4336                                 flowlabel = net->flowlabel;
4337                         } else if (stcb) {
4338                                 flowlabel = stcb->asoc.default_flowlabel;
4339                         } else {
4340                                 flowlabel = inp->sctp_ep.default_flowlabel;
4341                         }
4342                         if (flowlabel == 0) {
4343                                 /*
4344                                  * This means especially, that it is not set
4345                                  * at the SCTP layer. So use the value from
4346                                  * the IP layer.
4347                                  */
4348                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4349                         }
4350                         flowlabel &= 0x000fffff;
4351                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4352                         if (port) {
4353                                 len += sizeof(struct udphdr);
4354                         }
4355                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4356                         if (newm == NULL) {
4357                                 sctp_m_freem(m);
4358                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4359                                 return (ENOMEM);
4360                         }
4361                         SCTP_ALIGN_TO_END(newm, len);
4362                         SCTP_BUF_LEN(newm) = len;
4363                         SCTP_BUF_NEXT(newm) = m;
4364                         m = newm;
4365                         if (net != NULL) {
4366 #ifdef INVARIANTS
4367                                 if (net->flowidset == 0) {
4368                                         panic("Flow ID not set");
4369                                 }
4370 #endif
4371                                 m->m_pkthdr.flowid = net->flowid;
4372                                 m->m_flags |= M_FLOWID;
4373                         } else {
4374                                 if (use_mflowid != 0) {
4375                                         m->m_pkthdr.flowid = mflowid;
4376                                         m->m_flags |= M_FLOWID;
4377                                 }
4378                         }
4379                         packet_length = sctp_calculate_len(m);
4380
4381                         ip6h = mtod(m, struct ip6_hdr *);
4382                         /* protect *sin6 from overwrite */
4383                         sin6 = (struct sockaddr_in6 *)to;
4384                         tmp = *sin6;
4385                         sin6 = &tmp;
4386
4387                         /* KAME hack: embed scopeid */
4388                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4389                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4390                                 return (EINVAL);
4391                         }
4392                         if (net == NULL) {
4393                                 memset(&ip6route, 0, sizeof(ip6route));
4394                                 ro = (sctp_route_t *) & ip6route;
4395                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4396                         } else {
4397                                 ro = (sctp_route_t *) & net->ro;
4398                         }
4399                         /*
4400                          * We assume here that inp_flow is in host byte
4401                          * order within the TCB!
4402                          */
4403                         if (tos_value == 0) {
4404                                 /*
4405                                  * This means especially, that it is not set
4406                                  * at the SCTP layer. So use the value from
4407                                  * the IP layer.
4408                                  */
4409                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4410                         }
4411                         tos_value &= 0xfc;
4412                         if (ecn_ok) {
4413                                 tos_value |= sctp_get_ect(stcb);
4414                         }
4415                         flowinfo = 0x06;
4416                         flowinfo <<= 8;
4417                         flowinfo |= tos_value;
4418                         flowinfo <<= 20;
4419                         flowinfo |= flowlabel;
4420                         ip6h->ip6_flow = htonl(flowinfo);
4421                         if (port) {
4422                                 ip6h->ip6_nxt = IPPROTO_UDP;
4423                         } else {
4424                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4425                         }
4426                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4427                         ip6h->ip6_dst = sin6->sin6_addr;
4428
4429                         /*
4430                          * Add SRC address selection here: we can only reuse
4431                          * to a limited degree the kame src-addr-sel, since
4432                          * we can try their selection but it may not be
4433                          * bound.
4434                          */
4435                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4436                         lsa6_tmp.sin6_family = AF_INET6;
4437                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4438                         lsa6 = &lsa6_tmp;
4439                         if (net && out_of_asoc_ok == 0) {
4440                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4441                                         sctp_free_ifa(net->ro._s_addr);
4442                                         net->ro._s_addr = NULL;
4443                                         net->src_addr_selected = 0;
4444                                         if (ro->ro_rt) {
4445                                                 RTFREE(ro->ro_rt);
4446                                                 ro->ro_rt = NULL;
4447                                         }
4448                                 }
4449                                 if (net->src_addr_selected == 0) {
4450                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4451                                         /* KAME hack: embed scopeid */
4452                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4453                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4454                                                 return (EINVAL);
4455                                         }
4456                                         /* Cache the source address */
4457                                         net->ro._s_addr = sctp_source_address_selection(inp,
4458                                             stcb,
4459                                             ro,
4460                                             net,
4461                                             0,
4462                                             vrf_id);
4463                                         (void)sa6_recoverscope(sin6);
4464                                         net->src_addr_selected = 1;
4465                                 }
4466                                 if (net->ro._s_addr == NULL) {
4467                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4468                                         net->src_addr_selected = 0;
4469                                         sctp_handle_no_route(stcb, net, so_locked);
4470                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4471                                         sctp_m_freem(m);
4472                                         return (EHOSTUNREACH);
4473                                 }
4474                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4475                         } else {
4476                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4477                                 /* KAME hack: embed scopeid */
4478                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4479                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4480                                         return (EINVAL);
4481                                 }
4482                                 if (over_addr == NULL) {
4483                                         struct sctp_ifa *_lsrc;
4484
4485                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4486                                             net,
4487                                             out_of_asoc_ok,
4488                                             vrf_id);
4489                                         if (_lsrc == NULL) {
4490                                                 sctp_handle_no_route(stcb, net, so_locked);
4491                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4492                                                 sctp_m_freem(m);
4493                                                 return (EHOSTUNREACH);
4494                                         }
4495                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4496                                         sctp_free_ifa(_lsrc);
4497                                 } else {
4498                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4499                                         SCTP_RTALLOC(ro, vrf_id);
4500                                 }
4501                                 (void)sa6_recoverscope(sin6);
4502                         }
4503                         lsa6->sin6_port = inp->sctp_lport;
4504
4505                         if (ro->ro_rt == NULL) {
4506                                 /*
4507                                  * src addr selection failed to find a route
4508                                  * (or valid source addr), so we can't get
4509                                  * there from here!
4510                                  */
4511                                 sctp_handle_no_route(stcb, net, so_locked);
4512                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4513                                 sctp_m_freem(m);
4514                                 return (EHOSTUNREACH);
4515                         }
4516                         /*
4517                          * XXX: sa6 may not have a valid sin6_scope_id in
4518                          * the non-SCOPEDROUTING case.
4519                          */
4520                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4521                         lsa6_storage.sin6_family = AF_INET6;
4522                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4523                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4524                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4525                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4526                                 sctp_m_freem(m);
4527                                 return (error);
4528                         }
4529                         /* XXX */
4530                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4531                         lsa6_storage.sin6_port = inp->sctp_lport;
4532                         lsa6 = &lsa6_storage;
4533                         ip6h->ip6_src = lsa6->sin6_addr;
4534
4535                         if (port) {
4536                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4537                                         sctp_handle_no_route(stcb, net, so_locked);
4538                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4539                                         sctp_m_freem(m);
4540                                         return (EHOSTUNREACH);
4541                                 }
4542                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4543                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4544                                 udp->uh_dport = port;
4545                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4546                                 udp->uh_sum = 0;
4547                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4548                         } else {
4549                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4550                         }
4551
4552                         sctphdr->src_port = src_port;
4553                         sctphdr->dest_port = dest_port;
4554                         sctphdr->v_tag = v_tag;
4555                         sctphdr->checksum = 0;
4556
4557                         /*
4558                          * We set the hop limit now since there is a good
4559                          * chance that our ro pointer is now filled
4560                          */
4561                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4562                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4563
4564 #ifdef SCTP_DEBUG
4565                         /* Copy to be sure something bad is not happening */
4566                         sin6->sin6_addr = ip6h->ip6_dst;
4567                         lsa6->sin6_addr = ip6h->ip6_src;
4568 #endif
4569
4570                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4571                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4572                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4573                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4574                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4575                         if (net) {
4576                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4577                                 /*
4578                                  * preserve the port and scope for link
4579                                  * local send
4580                                  */
4581                                 prev_scope = sin6->sin6_scope_id;
4582                                 prev_port = sin6->sin6_port;
4583                         }
4584                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4585                                 /* failed to prepend data, give up */
4586                                 sctp_m_freem(m);
4587                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4588                                 return (ENOMEM);
4589                         }
4590                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4591                         if (port) {
4592 #if defined(SCTP_WITH_NO_CSUM)
4593                                 SCTP_STAT_INCR(sctps_sendnocrc);
4594 #else
4595                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4596                                 SCTP_STAT_INCR(sctps_sendswcrc);
4597 #endif
4598                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4599                                         udp->uh_sum = 0xffff;
4600                                 }
4601                         } else {
4602 #if defined(SCTP_WITH_NO_CSUM)
4603                                 SCTP_STAT_INCR(sctps_sendnocrc);
4604 #else
4605                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4606                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4607                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4608 #endif
4609                         }
4610                         /* send it out. table id is taken from stcb */
4611 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4612                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4613                                 so = SCTP_INP_SO(inp);
4614                                 SCTP_SOCKET_UNLOCK(so, 0);
4615                         }
4616 #endif
4617 #ifdef SCTP_PACKET_LOGGING
4618                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4619                                 sctp_packet_log(o_pak);
4620 #endif
4621                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4622 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4623                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4624                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4625                                 SCTP_TCB_UNLOCK(stcb);
4626                                 SCTP_SOCKET_LOCK(so, 0);
4627                                 SCTP_TCB_LOCK(stcb);
4628                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4629                         }
4630 #endif
4631                         if (net) {
4632                                 /* for link local this must be done */
4633                                 sin6->sin6_scope_id = prev_scope;
4634                                 sin6->sin6_port = prev_port;
4635                         }
4636                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4637                         SCTP_STAT_INCR(sctps_sendpackets);
4638                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4639                         if (ret) {
4640                                 SCTP_STAT_INCR(sctps_senderrors);
4641                         }
4642                         if (net == NULL) {
4643                                 /* Now if we had a temp route free it */
4644                                 RO_RTFREE(ro);
4645                         } else {
4646                                 /*
4647                                  * PMTU check versus smallest asoc MTU goes
4648                                  * here
4649                                  */
4650                                 if (ro->ro_rt == NULL) {
4651                                         /* Route was freed */
4652                                         if (net->ro._s_addr &&
4653                                             net->src_addr_selected) {
4654                                                 sctp_free_ifa(net->ro._s_addr);
4655                                                 net->ro._s_addr = NULL;
4656                                         }
4657                                         net->src_addr_selected = 0;
4658                                 }
4659                                 if ((ro->ro_rt != NULL) &&
4660                                     (net->ro._s_addr)) {
4661                                         uint32_t mtu;
4662
4663                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4664                                         if (mtu &&
4665                                             (stcb->asoc.smallest_mtu > mtu)) {
4666                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4667                                                 net->mtu = mtu;
4668                                                 if (net->port) {
4669                                                         net->mtu -= sizeof(struct udphdr);
4670                                                 }
4671                                         }
4672                                 } else if (ifp) {
4673                                         if (ND_IFINFO(ifp)->linkmtu &&
4674                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4675                                                 sctp_mtu_size_reset(inp,
4676                                                     &stcb->asoc,
4677                                                     ND_IFINFO(ifp)->linkmtu);
4678                                         }
4679                                 }
4680                         }
4681                         return (ret);
4682                 }
4683 #endif
4684         default:
4685                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4686                     ((struct sockaddr *)to)->sa_family);
4687                 sctp_m_freem(m);
4688                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4689                 return (EFAULT);
4690         }
4691 }
4692
4693
4694 void
4695 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4696 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4697     SCTP_UNUSED
4698 #endif
4699 )
4700 {
4701         struct mbuf *m;
4702         struct sctp_nets *net;
4703         struct sctp_init_chunk *init;
4704         struct sctp_supported_addr_param *sup_addr;
4705         struct sctp_adaptation_layer_indication *ali;
4706         struct sctp_supported_chunk_types_param *pr_supported;
4707         struct sctp_paramhdr *ph;
4708         int cnt_inits_to = 0;
4709         int ret;
4710         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4711
4712         /* INIT's always go to the primary (and usually ONLY address) */
4713         net = stcb->asoc.primary_destination;
4714         if (net == NULL) {
4715                 net = TAILQ_FIRST(&stcb->asoc.nets);
4716                 if (net == NULL) {
4717                         /* TSNH */
4718                         return;
4719                 }
4720                 /* we confirm any address we send an INIT to */
4721                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4722                 (void)sctp_set_primary_addr(stcb, NULL, net);
4723         } else {
4724                 /* we confirm any address we send an INIT to */
4725                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4726         }
4727         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4728 #ifdef INET6
4729         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4730                 /*
4731                  * special hook, if we are sending to link local it will not
4732                  * show up in our private address count.
4733                  */
4734                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4735                         cnt_inits_to = 1;
4736         }
4737 #endif
4738         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4739                 /* This case should not happen */
4740                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4741                 return;
4742         }
4743         /* start the INIT timer */
4744         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4745
4746         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4747         if (m == NULL) {
4748                 /* No memory, INIT timer will re-attempt. */
4749                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4750                 return;
4751         }
4752         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4753         padding_len = 0;
4754         /*
4755          * assume peer supports asconf in order to be able to queue local
4756          * address changes while an INIT is in flight and before the assoc
4757          * is established.
4758          */
4759         stcb->asoc.peer_supports_asconf = 1;
4760         /* Now lets put the chunk header in place */
4761         init = mtod(m, struct sctp_init_chunk *);
4762         /* now the chunk header */
4763         init->ch.chunk_type = SCTP_INITIATION;
4764         init->ch.chunk_flags = 0;
4765         /* fill in later from mbuf we build */
4766         init->ch.chunk_length = 0;
4767         /* place in my tag */
4768         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4769         /* set up some of the credits. */
4770         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4771             SCTP_MINIMAL_RWND));
4772         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4773         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4774         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4775
4776         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4777                 uint8_t i;
4778
4779                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4780                 if (stcb->asoc.scope.ipv4_addr_legal) {
4781                         parameter_len += (uint16_t) sizeof(uint16_t);
4782                 }
4783                 if (stcb->asoc.scope.ipv6_addr_legal) {
4784                         parameter_len += (uint16_t) sizeof(uint16_t);
4785                 }
4786                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4787                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4788                 sup_addr->ph.param_length = htons(parameter_len);
4789                 i = 0;
4790                 if (stcb->asoc.scope.ipv4_addr_legal) {
4791                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4792                 }
4793                 if (stcb->asoc.scope.ipv6_addr_legal) {
4794                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4795                 }
4796                 padding_len = 4 - 2 * i;
4797                 chunk_len += parameter_len;
4798         }
4799         /* Adaptation layer indication parameter */
4800         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4801                 if (padding_len > 0) {
4802                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4803                         chunk_len += padding_len;
4804                         padding_len = 0;
4805                 }
4806                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4807                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4808                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4809                 ali->ph.param_length = htons(parameter_len);
4810                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4811                 chunk_len += parameter_len;
4812         }
4813         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4814                 /* Add NAT friendly parameter. */
4815                 if (padding_len > 0) {
4816                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4817                         chunk_len += padding_len;
4818                         padding_len = 0;
4819                 }
4820                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4821                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4822                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4823                 ph->param_length = htons(parameter_len);
4824                 chunk_len += parameter_len;
4825         }
4826         /* now any cookie time extensions */
4827         if (stcb->asoc.cookie_preserve_req) {
4828                 struct sctp_cookie_perserve_param *cookie_preserve;
4829
4830                 if (padding_len > 0) {
4831                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4832                         chunk_len += padding_len;
4833                         padding_len = 0;
4834                 }
4835                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4836                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4837                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4838                 cookie_preserve->ph.param_length = htons(parameter_len);
4839                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4840                 stcb->asoc.cookie_preserve_req = 0;
4841                 chunk_len += parameter_len;
4842         }
4843         /* ECN parameter */
4844         if (stcb->asoc.ecn_allowed == 1) {
4845                 if (padding_len > 0) {
4846                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4847                         chunk_len += padding_len;
4848                         padding_len = 0;
4849                 }
4850                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4851                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4852                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4853                 ph->param_length = htons(parameter_len);
4854                 chunk_len += parameter_len;
4855         }
4856         /* And now tell the peer we do support PR-SCTP. */
4857         if (padding_len > 0) {
4858                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4859                 chunk_len += padding_len;
4860                 padding_len = 0;
4861         }
4862         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4863         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4864         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4865         ph->param_length = htons(parameter_len);
4866         chunk_len += parameter_len;
4867
4868         /* And now tell the peer we do all the extensions */
4869         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4870         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4871         num_ext = 0;
4872         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4873         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4874         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4875         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4876         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4877         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4878                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4879         }
4880         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4881                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4882         }
4883         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4884         pr_supported->ph.param_length = htons(parameter_len);
4885         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4886         chunk_len += parameter_len;
4887
4888         /* add authentication parameters */
4889         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4890                 /* attach RANDOM parameter, if available */
4891                 if (stcb->asoc.authinfo.random != NULL) {
4892                         struct sctp_auth_random *randp;
4893
4894                         if (padding_len > 0) {
4895                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4896                                 chunk_len += padding_len;
4897                                 padding_len = 0;
4898                         }
4899                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4900                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4901                         /* random key already contains the header */
4902                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4903                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4904                         chunk_len += parameter_len;
4905                 }
4906                 /* add HMAC_ALGO parameter */
4907                 if ((stcb->asoc.local_hmacs != NULL) &&
4908                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4909                         struct sctp_auth_hmac_algo *hmacs;
4910
4911                         if (padding_len > 0) {
4912                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4913                                 chunk_len += padding_len;
4914                                 padding_len = 0;
4915                         }
4916                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4917                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4918                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4919                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4920                         hmacs->ph.param_length = htons(parameter_len);
4921                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4922                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4923                         chunk_len += parameter_len;
4924                 }
4925                 /* add CHUNKS parameter */
4926                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4927                         struct sctp_auth_chunk_list *chunks;
4928
4929                         if (padding_len > 0) {
4930                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4931                                 chunk_len += padding_len;
4932                                 padding_len = 0;
4933                         }
4934                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4935                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4936                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4937                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4938                         chunks->ph.param_length = htons(parameter_len);
4939                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4940                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4941                         chunk_len += parameter_len;
4942                 }
4943         }
4944         SCTP_BUF_LEN(m) = chunk_len;
4945
4946         /* now the addresses */
4947         /*
4948          * To optimize this we could put the scoping stuff into a structure
4949          * and remove the individual uint8's from the assoc structure. Then
4950          * we could just sifa in the address within the stcb. But for now
4951          * this is a quick hack to get the address stuff teased apart.
4952          */
4953         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4954
4955         init->ch.chunk_length = htons(chunk_len);
4956         if (padding_len > 0) {
4957                 struct mbuf *m_at, *mp_last;
4958
4959                 mp_last = NULL;
4960                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4961                         if (SCTP_BUF_NEXT(m_at) == NULL)
4962                                 mp_last = m_at;
4963                 }
4964                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4965                         sctp_m_freem(m);
4966                         return;
4967                 }
4968         }
4969         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4970         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4971             (struct sockaddr *)&net->ro._l_addr,
4972             m, 0, NULL, 0, 0, 0, 0,
4973             inp->sctp_lport, stcb->rport, htonl(0),
4974             net->port, NULL,
4975             0, 0,
4976             so_locked);
4977         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4978         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4979         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4980 }
4981
4982 struct mbuf *
4983 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4984     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4985 {
4986         /*
4987          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4988          * being equal to the beginning of the params i.e. (iphlen +
4989          * sizeof(struct sctp_init_msg) parse through the parameters to the
4990          * end of the mbuf verifying that all parameters are known.
4991          *
4992          * For unknown parameters build and return a mbuf with
4993          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4994          * processing this chunk stop, and set *abort_processing to 1.
4995          *
4996          * By having param_offset be pre-set to where parameters begin it is
4997          * hoped that this routine may be reused in the future by new
4998          * features.
4999          */
5000         struct sctp_paramhdr *phdr, params;
5001
5002         struct mbuf *mat, *op_err;
5003         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
5004         int at, limit, pad_needed;
5005         uint16_t ptype, plen, padded_size;
5006         int err_at;
5007
5008         *abort_processing = 0;
5009         mat = in_initpkt;
5010         err_at = 0;
5011         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5012         at = param_offset;
5013         op_err = NULL;
5014         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5015         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5016         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5017                 ptype = ntohs(phdr->param_type);
5018                 plen = ntohs(phdr->param_length);
5019                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5020                         /* wacked parameter */
5021                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5022                         goto invalid_size;
5023                 }
5024                 limit -= SCTP_SIZE32(plen);
5025                 /*-
5026                  * All parameters for all chunks that we know/understand are
5027                  * listed here. We process them other places and make
5028                  * appropriate stop actions per the upper bits. However this
5029                  * is the generic routine processor's can call to get back
5030                  * an operr.. to either incorporate (init-ack) or send.
5031                  */
5032                 padded_size = SCTP_SIZE32(plen);
5033                 switch (ptype) {
5034                         /* Param's with variable size */
5035                 case SCTP_HEARTBEAT_INFO:
5036                 case SCTP_STATE_COOKIE:
5037                 case SCTP_UNRECOG_PARAM:
5038                 case SCTP_ERROR_CAUSE_IND:
5039                         /* ok skip fwd */
5040                         at += padded_size;
5041                         break;
5042                         /* Param's with variable size within a range */
5043                 case SCTP_CHUNK_LIST:
5044                 case SCTP_SUPPORTED_CHUNK_EXT:
5045                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5046                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5047                                 goto invalid_size;
5048                         }
5049                         at += padded_size;
5050                         break;
5051                 case SCTP_SUPPORTED_ADDRTYPE:
5052                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5053                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5054                                 goto invalid_size;
5055                         }
5056                         at += padded_size;
5057                         break;
5058                 case SCTP_RANDOM:
5059                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5061                                 goto invalid_size;
5062                         }
5063                         at += padded_size;
5064                         break;
5065                 case SCTP_SET_PRIM_ADDR:
5066                 case SCTP_DEL_IP_ADDRESS:
5067                 case SCTP_ADD_IP_ADDRESS:
5068                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5069                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5070                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5071                                 goto invalid_size;
5072                         }
5073                         at += padded_size;
5074                         break;
5075                         /* Param's with a fixed size */
5076                 case SCTP_IPV4_ADDRESS:
5077                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5078                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5079                                 goto invalid_size;
5080                         }
5081                         at += padded_size;
5082                         break;
5083                 case SCTP_IPV6_ADDRESS:
5084                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5085                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5086                                 goto invalid_size;
5087                         }
5088                         at += padded_size;
5089                         break;
5090                 case SCTP_COOKIE_PRESERVE:
5091                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5092                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5093                                 goto invalid_size;
5094                         }
5095                         at += padded_size;
5096                         break;
5097                 case SCTP_HAS_NAT_SUPPORT:
5098                         *nat_friendly = 1;
5099                         /* fall through */
5100                 case SCTP_PRSCTP_SUPPORTED:
5101
5102                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5104                                 goto invalid_size;
5105                         }
5106                         at += padded_size;
5107                         break;
5108                 case SCTP_ECN_CAPABLE:
5109                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
5110                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5111                                 goto invalid_size;
5112                         }
5113                         at += padded_size;
5114                         break;
5115                 case SCTP_ULP_ADAPTATION:
5116                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5117                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5118                                 goto invalid_size;
5119                         }
5120                         at += padded_size;
5121                         break;
5122                 case SCTP_SUCCESS_REPORT:
5123                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5124                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5125                                 goto invalid_size;
5126                         }
5127                         at += padded_size;
5128                         break;
5129                 case SCTP_HOSTNAME_ADDRESS:
5130                         {
5131                                 /* We can NOT handle HOST NAME addresses!! */
5132                                 int l_len;
5133
5134                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5135                                 *abort_processing = 1;
5136                                 if (op_err == NULL) {
5137                                         /* Ok need to try to get a mbuf */
5138 #ifdef INET6
5139                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5140 #else
5141                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5142 #endif
5143                                         l_len += plen;
5144                                         l_len += sizeof(struct sctp_paramhdr);
5145                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5146                                         if (op_err) {
5147                                                 SCTP_BUF_LEN(op_err) = 0;
5148                                                 /*
5149                                                  * pre-reserve space for ip
5150                                                  * and sctp header  and
5151                                                  * chunk hdr
5152                                                  */
5153 #ifdef INET6
5154                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5155 #else
5156                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5157 #endif
5158                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5159                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5160                                         }
5161                                 }
5162                                 if (op_err) {
5163                                         /* If we have space */
5164                                         struct sctp_paramhdr s;
5165
5166                                         if (err_at % 4) {
5167                                                 uint32_t cpthis = 0;
5168
5169                                                 pad_needed = 4 - (err_at % 4);
5170                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5171                                                 err_at += pad_needed;
5172                                         }
5173                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5174                                         s.param_length = htons(sizeof(s) + plen);
5175                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5176                                         err_at += sizeof(s);
5177                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5178                                         if (phdr == NULL) {
5179                                                 sctp_m_freem(op_err);
5180                                                 /*
5181                                                  * we are out of memory but
5182                                                  * we still need to have a
5183                                                  * look at what to do (the
5184                                                  * system is in trouble
5185                                                  * though).
5186                                                  */
5187                                                 return (NULL);
5188                                         }
5189                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5190                                 }
5191                                 return (op_err);
5192                                 break;
5193                         }
5194                 default:
5195                         /*
5196                          * we do not recognize the parameter figure out what
5197                          * we do.
5198                          */
5199                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5200                         if ((ptype & 0x4000) == 0x4000) {
5201                                 /* Report bit is set?? */
5202                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5203                                 if (op_err == NULL) {
5204                                         int l_len;
5205
5206                                         /* Ok need to try to get an mbuf */
5207 #ifdef INET6
5208                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5209 #else
5210                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5211 #endif
5212                                         l_len += plen;
5213                                         l_len += sizeof(struct sctp_paramhdr);
5214                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5215                                         if (op_err) {
5216                                                 SCTP_BUF_LEN(op_err) = 0;
5217 #ifdef INET6
5218                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5219 #else
5220                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5221 #endif
5222                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5223                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5224                                         }
5225                                 }
5226                                 if (op_err) {
5227                                         /* If we have space */
5228                                         struct sctp_paramhdr s;
5229
5230                                         if (err_at % 4) {
5231                                                 uint32_t cpthis = 0;
5232
5233                                                 pad_needed = 4 - (err_at % 4);
5234                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5235                                                 err_at += pad_needed;
5236                                         }
5237                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5238                                         s.param_length = htons(sizeof(s) + plen);
5239                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5240                                         err_at += sizeof(s);
5241                                         if (plen > sizeof(tempbuf)) {
5242                                                 plen = sizeof(tempbuf);
5243                                         }
5244                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5245                                         if (phdr == NULL) {
5246                                                 sctp_m_freem(op_err);
5247                                                 /*
5248                                                  * we are out of memory but
5249                                                  * we still need to have a
5250                                                  * look at what to do (the
5251                                                  * system is in trouble
5252                                                  * though).
5253                                                  */
5254                                                 op_err = NULL;
5255                                                 goto more_processing;
5256                                         }
5257                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5258                                         err_at += plen;
5259                                 }
5260                         }
5261         more_processing:
5262                         if ((ptype & 0x8000) == 0x0000) {
5263                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5264                                 return (op_err);
5265                         } else {
5266                                 /* skip this chunk and continue processing */
5267                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5268                                 at += SCTP_SIZE32(plen);
5269                         }
5270                         break;
5271
5272                 }
5273                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5274         }
5275         return (op_err);
5276 invalid_size:
5277         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5278         *abort_processing = 1;
5279         if ((op_err == NULL) && phdr) {
5280                 int l_len;
5281
5282 #ifdef INET6
5283                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5284 #else
5285                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5286 #endif
5287                 l_len += (2 * sizeof(struct sctp_paramhdr));
5288                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5289                 if (op_err) {
5290                         SCTP_BUF_LEN(op_err) = 0;
5291 #ifdef INET6
5292                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5293 #else
5294                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5295 #endif
5296                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5297                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5298                 }
5299         }
5300         if ((op_err) && phdr) {
5301                 struct sctp_paramhdr s;
5302
5303                 if (err_at % 4) {
5304                         uint32_t cpthis = 0;
5305
5306                         pad_needed = 4 - (err_at % 4);
5307                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5308                         err_at += pad_needed;
5309                 }
5310                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5311                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5312                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5313                 err_at += sizeof(s);
5314                 /* Only copy back the p-hdr that caused the issue */
5315                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5316         }
5317         return (op_err);
5318 }
5319
5320 static int
5321 sctp_are_there_new_addresses(struct sctp_association *asoc,
5322     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5323 {
5324         /*
5325          * Given a INIT packet, look through the packet to verify that there
5326          * are NO new addresses. As we go through the parameters add reports
5327          * of any un-understood parameters that require an error.  Also we
5328          * must return (1) to drop the packet if we see a un-understood
5329          * parameter that tells us to drop the chunk.
5330          */
5331         struct sockaddr *sa_touse;
5332         struct sockaddr *sa;
5333         struct sctp_paramhdr *phdr, params;
5334         uint16_t ptype, plen;
5335         uint8_t fnd;
5336         struct sctp_nets *net;
5337
5338 #ifdef INET
5339         struct sockaddr_in sin4, *sa4;
5340
5341 #endif
5342 #ifdef INET6
5343         struct sockaddr_in6 sin6, *sa6;
5344
5345 #endif
5346
5347 #ifdef INET
5348         memset(&sin4, 0, sizeof(sin4));
5349         sin4.sin_family = AF_INET;
5350         sin4.sin_len = sizeof(sin4);
5351 #endif
5352 #ifdef INET6
5353         memset(&sin6, 0, sizeof(sin6));
5354         sin6.sin6_family = AF_INET6;
5355         sin6.sin6_len = sizeof(sin6);
5356 #endif
5357         /* First what about the src address of the pkt ? */
5358         fnd = 0;
5359         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5360                 sa = (struct sockaddr *)&net->ro._l_addr;
5361                 if (sa->sa_family == src->sa_family) {
5362 #ifdef INET
5363                         if (sa->sa_family == AF_INET) {
5364                                 struct sockaddr_in *src4;
5365
5366                                 sa4 = (struct sockaddr_in *)sa;
5367                                 src4 = (struct sockaddr_in *)src;
5368                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5369                                         fnd = 1;
5370                                         break;
5371                                 }
5372                         }
5373 #endif
5374 #ifdef INET6
5375                         if (sa->sa_family == AF_INET6) {
5376                                 struct sockaddr_in6 *src6;
5377
5378                                 sa6 = (struct sockaddr_in6 *)sa;
5379                                 src6 = (struct sockaddr_in6 *)src;
5380                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5381                                         fnd = 1;
5382                                         break;
5383                                 }
5384                         }
5385 #endif
5386                 }
5387         }
5388         if (fnd == 0) {
5389                 /* New address added! no need to look futher. */
5390                 return (1);
5391         }
5392         /* Ok so far lets munge through the rest of the packet */
5393         offset += sizeof(struct sctp_init_chunk);
5394         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5395         while (phdr) {
5396                 sa_touse = NULL;
5397                 ptype = ntohs(phdr->param_type);
5398                 plen = ntohs(phdr->param_length);
5399                 switch (ptype) {
5400 #ifdef INET
5401                 case SCTP_IPV4_ADDRESS:
5402                         {
5403                                 struct sctp_ipv4addr_param *p4, p4_buf;
5404
5405                                 phdr = sctp_get_next_param(in_initpkt, offset,
5406                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5407                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5408                                     phdr == NULL) {
5409                                         return (1);
5410                                 }
5411                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5412                                 sin4.sin_addr.s_addr = p4->addr;
5413                                 sa_touse = (struct sockaddr *)&sin4;
5414                                 break;
5415                         }
5416 #endif
5417 #ifdef INET6
5418                 case SCTP_IPV6_ADDRESS:
5419                         {
5420                                 struct sctp_ipv6addr_param *p6, p6_buf;
5421
5422                                 phdr = sctp_get_next_param(in_initpkt, offset,
5423                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5424                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5425                                     phdr == NULL) {
5426                                         return (1);
5427                                 }
5428                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5429                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5430                                     sizeof(p6->addr));
5431                                 sa_touse = (struct sockaddr *)&sin6;
5432                                 break;
5433                         }
5434 #endif
5435                 default:
5436                         sa_touse = NULL;
5437                         break;
5438                 }
5439                 if (sa_touse) {
5440                         /* ok, sa_touse points to one to check */
5441                         fnd = 0;
5442                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5443                                 sa = (struct sockaddr *)&net->ro._l_addr;
5444                                 if (sa->sa_family != sa_touse->sa_family) {
5445                                         continue;
5446                                 }
5447 #ifdef INET
5448                                 if (sa->sa_family == AF_INET) {
5449                                         sa4 = (struct sockaddr_in *)sa;
5450                                         if (sa4->sin_addr.s_addr ==
5451                                             sin4.sin_addr.s_addr) {
5452                                                 fnd = 1;
5453                                                 break;
5454                                         }
5455                                 }
5456 #endif
5457 #ifdef INET6
5458                                 if (sa->sa_family == AF_INET6) {
5459                                         sa6 = (struct sockaddr_in6 *)sa;
5460                                         if (SCTP6_ARE_ADDR_EQUAL(
5461                                             sa6, &sin6)) {
5462                                                 fnd = 1;
5463                                                 break;
5464                                         }
5465                                 }
5466 #endif
5467                         }
5468                         if (!fnd) {
5469                                 /* New addr added! no need to look further */
5470                                 return (1);
5471                         }
5472                 }
5473                 offset += SCTP_SIZE32(plen);
5474                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5475         }
5476         return (0);
5477 }
5478
5479 /*
5480  * Given a MBUF chain that was sent into us containing an INIT. Build a
5481  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5482  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5483  * message (i.e. the struct sctp_init_msg).
5484  */
5485 void
5486 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5487     struct mbuf *init_pkt, int iphlen, int offset,
5488     struct sockaddr *src, struct sockaddr *dst,
5489     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490     uint8_t use_mflowid, uint32_t mflowid,
5491     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5492 {
5493         struct sctp_association *asoc;
5494         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5495         struct sctp_init_ack_chunk *initack;
5496         struct sctp_adaptation_layer_indication *ali;
5497         struct sctp_ecn_supported_param *ecn;
5498         struct sctp_prsctp_supported_param *prsctp;
5499         struct sctp_supported_chunk_types_param *pr_supported;
5500         union sctp_sockstore *over_addr;
5501
5502 #ifdef INET
5503         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5504         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5505         struct sockaddr_in *sin;
5506
5507 #endif
5508 #ifdef INET6
5509         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5510         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5511         struct sockaddr_in6 *sin6;
5512
5513 #endif
5514         struct sockaddr *to;
5515         struct sctp_state_cookie stc;
5516         struct sctp_nets *net = NULL;
5517         uint8_t *signature = NULL;
5518         int cnt_inits_to = 0;
5519         uint16_t his_limit, i_want;
5520         int abort_flag, padval;
5521         int num_ext;
5522         int p_len;
5523         int nat_friendly = 0;
5524         struct socket *so;
5525
5526         if (stcb) {
5527                 asoc = &stcb->asoc;
5528         } else {
5529                 asoc = NULL;
5530         }
5531         mp_last = NULL;
5532         if ((asoc != NULL) &&
5533             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5534             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5535                 /* new addresses, out of here in non-cookie-wait states */
5536                 /*
5537                  * Send a ABORT, we don't add the new address error clause
5538                  * though we even set the T bit and copy in the 0 tag.. this
5539                  * looks no different than if no listener was present.
5540                  */
5541                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5542                     "Address added");
5543                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5544                     use_mflowid, mflowid,
5545                     vrf_id, port);
5546                 return;
5547         }
5548         abort_flag = 0;
5549         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5550             (offset + sizeof(struct sctp_init_chunk)),
5551             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5552         if (abort_flag) {
5553 do_a_abort:
5554                 if (op_err == NULL) {
5555                         char msg[SCTP_DIAG_INFO_LEN];
5556
5557                         snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5558                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559                             msg);
5560                 }
5561                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5562                     init_chk->init.initiate_tag, op_err,
5563                     use_mflowid, mflowid,
5564                     vrf_id, port);
5565                 return;
5566         }
5567         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5568         if (m == NULL) {
5569                 /* No memory, INIT timer will re-attempt. */
5570                 if (op_err)
5571                         sctp_m_freem(op_err);
5572                 return;
5573         }
5574         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5575
5576         /*
5577          * We might not overwrite the identification[] completely and on
5578          * some platforms time_entered will contain some padding. Therefore
5579          * zero out the cookie to avoid putting uninitialized memory on the
5580          * wire.
5581          */
5582         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5583
5584         /* the time I built cookie */
5585         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5586
5587         /* populate any tie tags */
5588         if (asoc != NULL) {
5589                 /* unlock before tag selections */
5590                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5591                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5592                 stc.cookie_life = asoc->cookie_life;
5593                 net = asoc->primary_destination;
5594         } else {
5595                 stc.tie_tag_my_vtag = 0;
5596                 stc.tie_tag_peer_vtag = 0;
5597                 /* life I will award this cookie */
5598                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5599         }
5600
5601         /* copy in the ports for later check */
5602         stc.myport = sh->dest_port;
5603         stc.peerport = sh->src_port;
5604
5605         /*
5606          * If we wanted to honor cookie life extentions, we would add to
5607          * stc.cookie_life. For now we should NOT honor any extension
5608          */
5609         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5610         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5611                 stc.ipv6_addr_legal = 1;
5612                 if (SCTP_IPV6_V6ONLY(inp)) {
5613                         stc.ipv4_addr_legal = 0;
5614                 } else {
5615                         stc.ipv4_addr_legal = 1;
5616                 }
5617         } else {
5618                 stc.ipv6_addr_legal = 0;
5619                 stc.ipv4_addr_legal = 1;
5620         }
5621 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5622         stc.ipv4_scope = 1;
5623 #else
5624         stc.ipv4_scope = 0;
5625 #endif
5626         if (net == NULL) {
5627                 to = src;
5628                 switch (dst->sa_family) {
5629 #ifdef INET
5630                 case AF_INET:
5631                         {
5632                                 /* lookup address */
5633                                 stc.address[0] = src4->sin_addr.s_addr;
5634                                 stc.address[1] = 0;
5635                                 stc.address[2] = 0;
5636                                 stc.address[3] = 0;
5637                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5638                                 /* local from address */
5639                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5640                                 stc.laddress[1] = 0;
5641                                 stc.laddress[2] = 0;
5642                                 stc.laddress[3] = 0;
5643                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5644                                 /* scope_id is only for v6 */
5645                                 stc.scope_id = 0;
5646 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5647                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5648                                         stc.ipv4_scope = 1;
5649                                 }
5650 #else
5651                                 stc.ipv4_scope = 1;
5652 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5653                                 /* Must use the address in this case */
5654                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5655                                         stc.loopback_scope = 1;
5656                                         stc.ipv4_scope = 1;
5657                                         stc.site_scope = 1;
5658                                         stc.local_scope = 0;
5659                                 }
5660                                 break;
5661                         }
5662 #endif
5663 #ifdef INET6
5664                 case AF_INET6:
5665                         {
5666                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5667                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5668                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5669                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5670                                         stc.loopback_scope = 1;
5671                                         stc.local_scope = 0;
5672                                         stc.site_scope = 1;
5673                                         stc.ipv4_scope = 1;
5674                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5675                                         /*
5676                                          * If the new destination is a
5677                                          * LINK_LOCAL we must have common
5678                                          * both site and local scope. Don't
5679                                          * set local scope though since we
5680                                          * must depend on the source to be
5681                                          * added implicitly. We cannot
5682                                          * assure just because we share one
5683                                          * link that all links are common.
5684                                          */
5685                                         stc.local_scope = 0;
5686                                         stc.site_scope = 1;
5687                                         stc.ipv4_scope = 1;
5688                                         /*
5689                                          * we start counting for the private
5690                                          * address stuff at 1. since the
5691                                          * link local we source from won't
5692                                          * show up in our scoped count.
5693                                          */
5694                                         cnt_inits_to = 1;
5695                                         /*
5696                                          * pull out the scope_id from
5697                                          * incoming pkt
5698                                          */
5699                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5700                                         /*
5701                                          * If the new destination is
5702                                          * SITE_LOCAL then we must have site
5703                                          * scope in common.
5704                                          */
5705                                         stc.site_scope = 1;
5706                                 }
5707                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5708                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5709                                 break;
5710                         }
5711 #endif
5712                 default:
5713                         /* TSNH */
5714                         goto do_a_abort;
5715                         break;
5716                 }
5717         } else {
5718                 /* set the scope per the existing tcb */
5719
5720 #ifdef INET6
5721                 struct sctp_nets *lnet;
5722
5723 #endif
5724
5725                 stc.loopback_scope = asoc->scope.loopback_scope;
5726                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5727                 stc.site_scope = asoc->scope.site_scope;
5728                 stc.local_scope = asoc->scope.local_scope;
5729 #ifdef INET6
5730                 /* Why do we not consider IPv4 LL addresses? */
5731                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5732                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5733                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5734                                         /*
5735                                          * if we have a LL address, start
5736                                          * counting at 1.
5737                                          */
5738                                         cnt_inits_to = 1;
5739                                 }
5740                         }
5741                 }
5742 #endif
5743                 /* use the net pointer */
5744                 to = (struct sockaddr *)&net->ro._l_addr;
5745                 switch (to->sa_family) {
5746 #ifdef INET
5747                 case AF_INET:
5748                         sin = (struct sockaddr_in *)to;
5749                         stc.address[0] = sin->sin_addr.s_addr;
5750                         stc.address[1] = 0;
5751                         stc.address[2] = 0;
5752                         stc.address[3] = 0;
5753                         stc.addr_type = SCTP_IPV4_ADDRESS;
5754                         if (net->src_addr_selected == 0) {
5755                                 /*
5756                                  * strange case here, the INIT should have
5757                                  * did the selection.
5758                                  */
5759                                 net->ro._s_addr = sctp_source_address_selection(inp,
5760                                     stcb, (sctp_route_t *) & net->ro,
5761                                     net, 0, vrf_id);
5762                                 if (net->ro._s_addr == NULL)
5763                                         return;
5764
5765                                 net->src_addr_selected = 1;
5766
5767                         }
5768                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5769                         stc.laddress[1] = 0;
5770                         stc.laddress[2] = 0;
5771                         stc.laddress[3] = 0;
5772                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5773                         /* scope_id is only for v6 */
5774                         stc.scope_id = 0;
5775                         break;
5776 #endif
5777 #ifdef INET6
5778                 case AF_INET6:
5779                         sin6 = (struct sockaddr_in6 *)to;
5780                         memcpy(&stc.address, &sin6->sin6_addr,
5781                             sizeof(struct in6_addr));
5782                         stc.addr_type = SCTP_IPV6_ADDRESS;
5783                         stc.scope_id = sin6->sin6_scope_id;
5784                         if (net->src_addr_selected == 0) {
5785                                 /*
5786                                  * strange case here, the INIT should have
5787                                  * done the selection.
5788                                  */
5789                                 net->ro._s_addr = sctp_source_address_selection(inp,
5790                                     stcb, (sctp_route_t *) & net->ro,
5791                                     net, 0, vrf_id);
5792                                 if (net->ro._s_addr == NULL)
5793                                         return;
5794
5795                                 net->src_addr_selected = 1;
5796                         }
5797                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5798                             sizeof(struct in6_addr));
5799                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5800                         break;
5801 #endif
5802                 }
5803         }
5804         /* Now lets put the SCTP header in place */
5805         initack = mtod(m, struct sctp_init_ack_chunk *);
5806         /* Save it off for quick ref */
5807         stc.peers_vtag = init_chk->init.initiate_tag;
5808         /* who are we */
5809         memcpy(stc.identification, SCTP_VERSION_STRING,
5810             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5811         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5812         /* now the chunk header */
5813         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5814         initack->ch.chunk_flags = 0;
5815         /* fill in later from mbuf we build */
5816         initack->ch.chunk_length = 0;
5817         /* place in my tag */
5818         if ((asoc != NULL) &&
5819             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5820             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5821             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5822                 /* re-use the v-tags and init-seq here */
5823                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5824                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5825         } else {
5826                 uint32_t vtag, itsn;
5827
5828                 if (hold_inp_lock) {
5829                         SCTP_INP_INCR_REF(inp);
5830                         SCTP_INP_RUNLOCK(inp);
5831                 }
5832                 if (asoc) {
5833                         atomic_add_int(&asoc->refcnt, 1);
5834                         SCTP_TCB_UNLOCK(stcb);
5835         new_tag:
5836                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5837                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5838                                 /*
5839                                  * Got a duplicate vtag on some guy behind a
5840                                  * nat make sure we don't use it.
5841                                  */
5842                                 goto new_tag;
5843                         }
5844                         initack->init.initiate_tag = htonl(vtag);
5845                         /* get a TSN to use too */
5846                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5847                         initack->init.initial_tsn = htonl(itsn);
5848                         SCTP_TCB_LOCK(stcb);
5849                         atomic_add_int(&asoc->refcnt, -1);
5850                 } else {
5851                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5852                         initack->init.initiate_tag = htonl(vtag);
5853                         /* get a TSN to use too */
5854                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5855                 }
5856                 if (hold_inp_lock) {
5857                         SCTP_INP_RLOCK(inp);
5858                         SCTP_INP_DECR_REF(inp);
5859                 }
5860         }
5861         /* save away my tag to */
5862         stc.my_vtag = initack->init.initiate_tag;
5863
5864         /* set up some of the credits. */
5865         so = inp->sctp_socket;
5866         if (so == NULL) {
5867                 /* memory problem */
5868                 sctp_m_freem(m);
5869                 return;
5870         } else {
5871                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5872         }
5873         /* set what I want */
5874         his_limit = ntohs(init_chk->init.num_inbound_streams);
5875         /* choose what I want */
5876         if (asoc != NULL) {
5877                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5878                         i_want = asoc->streamoutcnt;
5879                 } else {
5880                         i_want = inp->sctp_ep.pre_open_stream_count;
5881                 }
5882         } else {
5883                 i_want = inp->sctp_ep.pre_open_stream_count;
5884         }
5885         if (his_limit < i_want) {
5886                 /* I Want more :< */
5887                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5888         } else {
5889                 /* I can have what I want :> */
5890                 initack->init.num_outbound_streams = htons(i_want);
5891         }
5892         /* tell him his limit. */
5893         initack->init.num_inbound_streams =
5894             htons(inp->sctp_ep.max_open_streams_intome);
5895
5896         /* adaptation layer indication parameter */
5897         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5898                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5899                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5900                 ali->ph.param_length = htons(sizeof(*ali));
5901                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5902                 SCTP_BUF_LEN(m) += sizeof(*ali);
5903                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5904         } else {
5905                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5906         }
5907
5908         /* ECN parameter */
5909         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5910             (inp->sctp_ecn_enable == 1)) {
5911                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5912                 ecn->ph.param_length = htons(sizeof(*ecn));
5913                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5914
5915                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5916                     sizeof(*ecn));
5917         } else {
5918                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5919         }
5920         /* And now tell the peer we do  pr-sctp */
5921         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5922         prsctp->ph.param_length = htons(sizeof(*prsctp));
5923         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5924         if (nat_friendly) {
5925                 /* Add NAT friendly parameter */
5926                 struct sctp_paramhdr *ph;
5927
5928                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5929                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5930                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5931                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5932         }
5933         /* And now tell the peer we do all the extensions */
5934         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5935         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5936         num_ext = 0;
5937         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5938         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5939         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5940         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5941         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5942         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5943                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5944         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5945                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5946         p_len = sizeof(*pr_supported) + num_ext;
5947         pr_supported->ph.param_length = htons(p_len);
5948         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5949         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5950
5951         /* add authentication parameters */
5952         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5953                 struct sctp_auth_random *randp;
5954                 struct sctp_auth_hmac_algo *hmacs;
5955                 struct sctp_auth_chunk_list *chunks;
5956                 uint16_t random_len;
5957
5958                 /* generate and add RANDOM parameter */
5959                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5960                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5961                 randp->ph.param_type = htons(SCTP_RANDOM);
5962                 p_len = sizeof(*randp) + random_len;
5963                 randp->ph.param_length = htons(p_len);
5964                 SCTP_READ_RANDOM(randp->random_data, random_len);
5965                 /* zero out any padding required */
5966                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5967                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5968
5969                 /* add HMAC_ALGO parameter */
5970                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5971                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5972                     (uint8_t *) hmacs->hmac_ids);
5973                 if (p_len > 0) {
5974                         p_len += sizeof(*hmacs);
5975                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5976                         hmacs->ph.param_length = htons(p_len);
5977                         /* zero out any padding required */
5978                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5979                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5980                 }
5981                 /* add CHUNKS parameter */
5982                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5983                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5984                     chunks->chunk_types);
5985                 if (p_len > 0) {
5986                         p_len += sizeof(*chunks);
5987                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5988                         chunks->ph.param_length = htons(p_len);
5989                         /* zero out any padding required */
5990                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5991                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5992                 }
5993         }
5994         m_at = m;
5995         /* now the addresses */
5996         {
5997                 struct sctp_scoping scp;
5998
5999                 /*
6000                  * To optimize this we could put the scoping stuff into a
6001                  * structure and remove the individual uint8's from the stc
6002                  * structure. Then we could just sifa in the address within
6003                  * the stc.. but for now this is a quick hack to get the
6004                  * address stuff teased apart.
6005                  */
6006                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6007                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6008                 scp.loopback_scope = stc.loopback_scope;
6009                 scp.ipv4_local_scope = stc.ipv4_scope;
6010                 scp.local_scope = stc.local_scope;
6011                 scp.site_scope = stc.site_scope;
6012                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
6013         }
6014
6015         /* tack on the operational error if present */
6016         if (op_err) {
6017                 struct mbuf *ol;
6018                 int llen;
6019
6020                 llen = 0;
6021                 ol = op_err;
6022
6023                 while (ol) {
6024                         llen += SCTP_BUF_LEN(ol);
6025                         ol = SCTP_BUF_NEXT(ol);
6026                 }
6027                 if (llen % 4) {
6028                         /* must add a pad to the param */
6029                         uint32_t cpthis = 0;
6030                         int padlen;
6031
6032                         padlen = 4 - (llen % 4);
6033                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
6034                 }
6035                 while (SCTP_BUF_NEXT(m_at) != NULL) {
6036                         m_at = SCTP_BUF_NEXT(m_at);
6037                 }
6038                 SCTP_BUF_NEXT(m_at) = op_err;
6039                 while (SCTP_BUF_NEXT(m_at) != NULL) {
6040                         m_at = SCTP_BUF_NEXT(m_at);
6041                 }
6042         }
6043         /* pre-calulate the size and update pkt header and chunk header */
6044         p_len = 0;
6045         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6046                 p_len += SCTP_BUF_LEN(m_tmp);
6047                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6048                         /* m_tmp should now point to last one */
6049                         break;
6050                 }
6051         }
6052
6053         /* Now we must build a cookie */
6054         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6055         if (m_cookie == NULL) {
6056                 /* memory problem */
6057                 sctp_m_freem(m);
6058                 return;
6059         }
6060         /* Now append the cookie to the end and update the space/size */
6061         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6062
6063         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6064                 p_len += SCTP_BUF_LEN(m_tmp);
6065                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6066                         /* m_tmp should now point to last one */
6067                         mp_last = m_tmp;
6068                         break;
6069                 }
6070         }
6071         /*
6072          * Place in the size, but we don't include the last pad (if any) in
6073          * the INIT-ACK.
6074          */
6075         initack->ch.chunk_length = htons(p_len);
6076
6077         /*
6078          * Time to sign the cookie, we don't sign over the cookie signature
6079          * though thus we set trailer.
6080          */
6081         (void)sctp_hmac_m(SCTP_HMAC,
6082             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6083             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6084             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6085         /*
6086          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6087          * here since the timer will drive a retranmission.
6088          */
6089         padval = p_len % 4;
6090         if ((padval) && (mp_last)) {
6091                 /* see my previous comments on mp_last */
6092                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6093                         /* Houston we have a problem, no space */
6094                         sctp_m_freem(m);
6095                         return;
6096                 }
6097         }
6098         if (stc.loopback_scope) {
6099                 over_addr = (union sctp_sockstore *)dst;
6100         } else {
6101                 over_addr = NULL;
6102         }
6103
6104         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6105             0, 0,
6106             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6107             port, over_addr,
6108             use_mflowid, mflowid,
6109             SCTP_SO_NOT_LOCKED);
6110         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6111 }
6112
6113
6114 static void
6115 sctp_prune_prsctp(struct sctp_tcb *stcb,
6116     struct sctp_association *asoc,
6117     struct sctp_sndrcvinfo *srcv,
6118     int dataout)
6119 {
6120         int freed_spc = 0;
6121         struct sctp_tmit_chunk *chk, *nchk;
6122
6123         SCTP_TCB_LOCK_ASSERT(stcb);
6124         if ((asoc->peer_supports_prsctp) &&
6125             (asoc->sent_queue_cnt_removeable > 0)) {
6126                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6127                         /*
6128                          * Look for chunks marked with the PR_SCTP flag AND
6129                          * the buffer space flag. If the one being sent is
6130                          * equal or greater priority then purge the old one
6131                          * and free some space.
6132                          */
6133                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6134                                 /*
6135                                  * This one is PR-SCTP AND buffer space
6136                                  * limited type
6137                                  */
6138                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6139                                         /*
6140                                          * Lower numbers equates to higher
6141                                          * priority so if the one we are
6142                                          * looking at has a larger or equal
6143                                          * priority we want to drop the data
6144                                          * and NOT retransmit it.
6145                                          */
6146                                         if (chk->data) {
6147                                                 /*
6148                                                  * We release the book_size
6149                                                  * if the mbuf is here
6150                                                  */
6151                                                 int ret_spc;
6152                                                 uint8_t sent;
6153
6154                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6155                                                         sent = 1;
6156                                                 else
6157                                                         sent = 0;
6158                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6159                                                     sent,
6160                                                     SCTP_SO_LOCKED);
6161                                                 freed_spc += ret_spc;
6162                                                 if (freed_spc >= dataout) {
6163                                                         return;
6164                                                 }
6165                                         }       /* if chunk was present */
6166                                 }       /* if of sufficent priority */
6167                         }       /* if chunk has enabled */
6168                 }               /* tailqforeach */
6169
6170                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6171                         /* Here we must move to the sent queue and mark */
6172                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6173                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6174                                         if (chk->data) {
6175                                                 /*
6176                                                  * We release the book_size
6177                                                  * if the mbuf is here
6178                                                  */
6179                                                 int ret_spc;
6180
6181                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6182                                                     0, SCTP_SO_LOCKED);
6183
6184                                                 freed_spc += ret_spc;
6185                                                 if (freed_spc >= dataout) {
6186                                                         return;
6187                                                 }
6188                                         }       /* end if chk->data */
6189                                 }       /* end if right class */
6190                         }       /* end if chk pr-sctp */
6191                 }               /* tailqforeachsafe (chk) */
6192         }                       /* if enabled in asoc */
6193 }
6194
6195 int
6196 sctp_get_frag_point(struct sctp_tcb *stcb,
6197     struct sctp_association *asoc)
6198 {
6199         int siz, ovh;
6200
6201         /*
6202          * For endpoints that have both v6 and v4 addresses we must reserve
6203          * room for the ipv6 header, for those that are only dealing with V4
6204          * we use a larger frag point.
6205          */
6206         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6207                 ovh = SCTP_MED_OVERHEAD;
6208         } else {
6209                 ovh = SCTP_MED_V4_OVERHEAD;
6210         }
6211
6212         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6213                 siz = asoc->smallest_mtu - ovh;
6214         else
6215                 siz = (stcb->asoc.sctp_frag_point - ovh);
6216         /*
6217          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6218          */
6219         /* A data chunk MUST fit in a cluster */
6220         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6221         /* } */
6222
6223         /* adjust for an AUTH chunk if DATA requires auth */
6224         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6225                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6226
6227         if (siz % 4) {
6228                 /* make it an even word boundary please */
6229                 siz -= (siz % 4);
6230         }
6231         return (siz);
6232 }
6233
6234 static void
6235 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6236 {
6237         /*
6238          * We assume that the user wants PR_SCTP_TTL if the user provides a
6239          * positive lifetime but does not specify any PR_SCTP policy.
6240          */
6241         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6242                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6243         } else if (sp->timetolive > 0) {
6244                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6245                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6246         } else {
6247                 return;
6248         }
6249         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6250         case CHUNK_FLAGS_PR_SCTP_BUF:
6251                 /*
6252                  * Time to live is a priority stored in tv_sec when doing
6253                  * the buffer drop thing.
6254                  */
6255                 sp->ts.tv_sec = sp->timetolive;
6256                 sp->ts.tv_usec = 0;
6257                 break;
6258         case CHUNK_FLAGS_PR_SCTP_TTL:
6259                 {
6260                         struct timeval tv;
6261
6262                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6263                         tv.tv_sec = sp->timetolive / 1000;
6264                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6265                         /*
6266                          * TODO sctp_constants.h needs alternative time
6267                          * macros when _KERNEL is undefined.
6268                          */
6269                         timevaladd(&sp->ts, &tv);
6270                 }
6271                 break;
6272         case CHUNK_FLAGS_PR_SCTP_RTX:
6273                 /*
6274                  * Time to live is a the number or retransmissions stored in
6275                  * tv_sec.
6276                  */
6277                 sp->ts.tv_sec = sp->timetolive;
6278                 sp->ts.tv_usec = 0;
6279                 break;
6280         default:
6281                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6282                     "Unknown PR_SCTP policy %u.\n",
6283                     PR_SCTP_POLICY(sp->sinfo_flags));
6284                 break;
6285         }
6286 }
6287
6288 static int
6289 sctp_msg_append(struct sctp_tcb *stcb,
6290     struct sctp_nets *net,
6291     struct mbuf *m,
6292     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6293 {
6294         int error = 0;
6295         struct mbuf *at;
6296         struct sctp_stream_queue_pending *sp = NULL;
6297         struct sctp_stream_out *strm;
6298
6299         /*
6300          * Given an mbuf chain, put it into the association send queue and
6301          * place it on the wheel
6302          */
6303         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6304                 /* Invalid stream number */
6305                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6306                 error = EINVAL;
6307                 goto out_now;
6308         }
6309         if ((stcb->asoc.stream_locked) &&
6310             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6311                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6312                 error = EINVAL;
6313                 goto out_now;
6314         }
6315         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6316         /* Now can we send this? */
6317         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6318             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6319             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6320             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6321                 /* got data while shutting down */
6322                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6323                 error = ECONNRESET;
6324                 goto out_now;
6325         }
6326         sctp_alloc_a_strmoq(stcb, sp);
6327         if (sp == NULL) {
6328                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6329                 error = ENOMEM;
6330                 goto out_now;
6331         }
6332         sp->sinfo_flags = srcv->sinfo_flags;
6333         sp->timetolive = srcv->sinfo_timetolive;
6334         sp->ppid = srcv->sinfo_ppid;
6335         sp->context = srcv->sinfo_context;
6336         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6337                 sp->net = net;
6338                 atomic_add_int(&sp->net->ref_count, 1);
6339         } else {
6340                 sp->net = NULL;
6341         }
6342         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6343         sp->stream = srcv->sinfo_stream;
6344         sp->msg_is_complete = 1;
6345         sp->sender_all_done = 1;
6346         sp->some_taken = 0;
6347         sp->data = m;
6348         sp->tail_mbuf = NULL;
6349         sctp_set_prsctp_policy(sp);
6350         /*
6351          * We could in theory (for sendall) sifa the length in, but we would
6352          * still have to hunt through the chain since we need to setup the
6353          * tail_mbuf
6354          */
6355         sp->length = 0;
6356         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6357                 if (SCTP_BUF_NEXT(at) == NULL)
6358                         sp->tail_mbuf = at;
6359                 sp->length += SCTP_BUF_LEN(at);
6360         }
6361         if (srcv->sinfo_keynumber_valid) {
6362                 sp->auth_keyid = srcv->sinfo_keynumber;
6363         } else {
6364                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6365         }
6366         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6367                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6368                 sp->holds_key_ref = 1;
6369         }
6370         if (hold_stcb_lock == 0) {
6371                 SCTP_TCB_SEND_LOCK(stcb);
6372         }
6373         sctp_snd_sb_alloc(stcb, sp->length);
6374         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6375         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6376         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6377         m = NULL;
6378         if (hold_stcb_lock == 0) {
6379                 SCTP_TCB_SEND_UNLOCK(stcb);
6380         }
6381 out_now:
6382         if (m) {
6383                 sctp_m_freem(m);
6384         }
6385         return (error);
6386 }
6387
6388
6389 static struct mbuf *
6390 sctp_copy_mbufchain(struct mbuf *clonechain,
6391     struct mbuf *outchain,
6392     struct mbuf **endofchain,
6393     int can_take_mbuf,
6394     int sizeofcpy,
6395     uint8_t copy_by_ref)
6396 {
6397         struct mbuf *m;
6398         struct mbuf *appendchain;
6399         caddr_t cp;
6400         int len;
6401
6402         if (endofchain == NULL) {
6403                 /* error */
6404 error_out:
6405                 if (outchain)
6406                         sctp_m_freem(outchain);
6407                 return (NULL);
6408         }
6409         if (can_take_mbuf) {
6410                 appendchain = clonechain;
6411         } else {
6412                 if (!copy_by_ref &&
6413                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6414                     ) {
6415                         /* Its not in a cluster */
6416                         if (*endofchain == NULL) {
6417                                 /* lets get a mbuf cluster */
6418                                 if (outchain == NULL) {
6419                                         /* This is the general case */
6420                         new_mbuf:
6421                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6422                                         if (outchain == NULL) {
6423                                                 goto error_out;
6424                                         }
6425                                         SCTP_BUF_LEN(outchain) = 0;
6426                                         *endofchain = outchain;
6427                                         /* get the prepend space */
6428                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6429                                 } else {
6430                                         /*
6431                                          * We really should not get a NULL
6432                                          * in endofchain
6433                                          */
6434                                         /* find end */
6435                                         m = outchain;
6436                                         while (m) {
6437                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6438                                                         *endofchain = m;
6439                                                         break;
6440                                                 }
6441                                                 m = SCTP_BUF_NEXT(m);
6442                                         }
6443                                         /* sanity */
6444                                         if (*endofchain == NULL) {
6445                                                 /*
6446                                                  * huh, TSNH XXX maybe we
6447                                                  * should panic
6448                                                  */
6449                                                 sctp_m_freem(outchain);
6450                                                 goto new_mbuf;
6451                                         }
6452                                 }
6453                                 /* get the new end of length */
6454                                 len = M_TRAILINGSPACE(*endofchain);
6455                         } else {
6456                                 /* how much is left at the end? */
6457                                 len = M_TRAILINGSPACE(*endofchain);
6458                         }
6459                         /* Find the end of the data, for appending */
6460                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6461
6462                         /* Now lets copy it out */
6463                         if (len >= sizeofcpy) {
6464                                 /* It all fits, copy it in */
6465                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6466                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6467                         } else {
6468                                 /* fill up the end of the chain */
6469                                 if (len > 0) {
6470                                         m_copydata(clonechain, 0, len, cp);
6471                                         SCTP_BUF_LEN((*endofchain)) += len;
6472                                         /* now we need another one */
6473                                         sizeofcpy -= len;
6474                                 }
6475                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6476                                 if (m == NULL) {
6477                                         /* We failed */
6478                                         goto error_out;
6479                                 }
6480                                 SCTP_BUF_NEXT((*endofchain)) = m;
6481                                 *endofchain = m;
6482                                 cp = mtod((*endofchain), caddr_t);
6483                                 m_copydata(clonechain, len, sizeofcpy, cp);
6484                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6485                         }
6486                         return (outchain);
6487                 } else {
6488                         /* copy the old fashion way */
6489                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6490 #ifdef SCTP_MBUF_LOGGING
6491                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6492                                 struct mbuf *mat;
6493
6494                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6495                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6496                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6497                                         }
6498                                 }
6499                         }
6500 #endif
6501                 }
6502         }
6503         if (appendchain == NULL) {
6504                 /* error */
6505                 if (outchain)
6506                         sctp_m_freem(outchain);
6507                 return (NULL);
6508         }
6509         if (outchain) {
6510                 /* tack on to the end */
6511                 if (*endofchain != NULL) {
6512                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6513                 } else {
6514                         m = outchain;
6515                         while (m) {
6516                                 if (SCTP_BUF_NEXT(m) == NULL) {
6517                                         SCTP_BUF_NEXT(m) = appendchain;
6518                                         break;
6519                                 }
6520                                 m = SCTP_BUF_NEXT(m);
6521                         }
6522                 }
6523                 /*
6524                  * save off the end and update the end-chain postion
6525                  */
6526                 m = appendchain;
6527                 while (m) {
6528                         if (SCTP_BUF_NEXT(m) == NULL) {
6529                                 *endofchain = m;
6530                                 break;
6531                         }
6532                         m = SCTP_BUF_NEXT(m);
6533                 }
6534                 return (outchain);
6535         } else {
6536                 /* save off the end and update the end-chain postion */
6537                 m = appendchain;
6538                 while (m) {
6539                         if (SCTP_BUF_NEXT(m) == NULL) {
6540                                 *endofchain = m;
6541                                 break;
6542                         }
6543                         m = SCTP_BUF_NEXT(m);
6544                 }
6545                 return (appendchain);
6546         }
6547 }
6548
6549 static int
6550 sctp_med_chunk_output(struct sctp_inpcb *inp,
6551     struct sctp_tcb *stcb,
6552     struct sctp_association *asoc,
6553     int *num_out,
6554     int *reason_code,
6555     int control_only, int from_where,
6556     struct timeval *now, int *now_filled, int frag_point, int so_locked
6557 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6558     SCTP_UNUSED
6559 #endif
6560 );
6561
6562 static void
6563 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6564     uint32_t val SCTP_UNUSED)
6565 {
6566         struct sctp_copy_all *ca;
6567         struct mbuf *m;
6568         int ret = 0;
6569         int added_control = 0;
6570         int un_sent, do_chunk_output = 1;
6571         struct sctp_association *asoc;
6572         struct sctp_nets *net;
6573
6574         ca = (struct sctp_copy_all *)ptr;
6575         if (ca->m == NULL) {
6576                 return;
6577         }
6578         if (ca->inp != inp) {
6579                 /* TSNH */
6580                 return;
6581         }
6582         if (ca->sndlen > 0) {
6583                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6584                 if (m == NULL) {
6585                         /* can't copy so we are done */
6586                         ca->cnt_failed++;
6587                         return;
6588                 }
6589 #ifdef SCTP_MBUF_LOGGING
6590                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6591                         struct mbuf *mat;
6592
6593                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6594                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6595                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6596                                 }
6597                         }
6598                 }
6599 #endif
6600         } else {
6601                 m = NULL;
6602         }
6603         SCTP_TCB_LOCK_ASSERT(stcb);
6604         if (stcb->asoc.alternate) {
6605                 net = stcb->asoc.alternate;
6606         } else {
6607                 net = stcb->asoc.primary_destination;
6608         }
6609         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6610                 /* Abort this assoc with m as the user defined reason */
6611                 if (m != NULL) {
6612                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6613                 } else {
6614                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6615                             0, M_NOWAIT, 1, MT_DATA);
6616                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6617                 }
6618                 if (m != NULL) {
6619                         struct sctp_paramhdr *ph;
6620
6621                         ph = mtod(m, struct sctp_paramhdr *);
6622                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6623                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6624                 }
6625                 /*
6626                  * We add one here to keep the assoc from dis-appearing on
6627                  * us.
6628                  */
6629                 atomic_add_int(&stcb->asoc.refcnt, 1);
6630                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6631                 /*
6632                  * sctp_abort_an_association calls sctp_free_asoc() free
6633                  * association will NOT free it since we incremented the
6634                  * refcnt .. we do this to prevent it being freed and things
6635                  * getting tricky since we could end up (from free_asoc)
6636                  * calling inpcb_free which would get a recursive lock call
6637                  * to the iterator lock.. But as a consequence of that the
6638                  * stcb will return to us un-locked.. since free_asoc
6639                  * returns with either no TCB or the TCB unlocked, we must
6640                  * relock.. to unlock in the iterator timer :-0
6641                  */
6642                 SCTP_TCB_LOCK(stcb);
6643                 atomic_add_int(&stcb->asoc.refcnt, -1);
6644                 goto no_chunk_output;
6645         } else {
6646                 if (m) {
6647                         ret = sctp_msg_append(stcb, net, m,
6648                             &ca->sndrcv, 1);
6649                 }
6650                 asoc = &stcb->asoc;
6651                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6652                         /* shutdown this assoc */
6653                         int cnt;
6654
6655                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6656
6657                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6658                             TAILQ_EMPTY(&asoc->sent_queue) &&
6659                             (cnt == 0)) {
6660                                 if (asoc->locked_on_sending) {
6661                                         goto abort_anyway;
6662                                 }
6663                                 /*
6664                                  * there is nothing queued to send, so I'm
6665                                  * done...
6666                                  */
6667                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6668                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6669                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6670                                         /*
6671                                          * only send SHUTDOWN the first time
6672                                          * through
6673                                          */
6674                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6675                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6676                                         }
6677                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6678                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6679                                         sctp_stop_timers_for_shutdown(stcb);
6680                                         sctp_send_shutdown(stcb, net);
6681                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6682                                             net);
6683                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6684                                             asoc->primary_destination);
6685                                         added_control = 1;
6686                                         do_chunk_output = 0;
6687                                 }
6688                         } else {
6689                                 /*
6690                                  * we still got (or just got) data to send,
6691                                  * so set SHUTDOWN_PENDING
6692                                  */
6693                                 /*
6694                                  * XXX sockets draft says that SCTP_EOF
6695                                  * should be sent with no data.  currently,
6696                                  * we will allow user data to be sent first
6697                                  * and move to SHUTDOWN-PENDING
6698                                  */
6699                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6700                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6701                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6702                                         if (asoc->locked_on_sending) {
6703                                                 /*
6704                                                  * Locked to send out the
6705                                                  * data
6706                                                  */
6707                                                 struct sctp_stream_queue_pending *sp;
6708
6709                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6710                                                 if (sp) {
6711                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6712                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6713                                                 }
6714                                         }
6715                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6716                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6717                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6718                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6719                                 abort_anyway:
6720                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6721                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6722                                                     NULL, SCTP_SO_NOT_LOCKED);
6723                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6724                                                 goto no_chunk_output;
6725                                         }
6726                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6727                                             asoc->primary_destination);
6728                                 }
6729                         }
6730
6731                 }
6732         }
6733         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6734             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6735
6736         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6737             (stcb->asoc.total_flight > 0) &&
6738             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6739                 do_chunk_output = 0;
6740         }
6741         if (do_chunk_output)
6742                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6743         else if (added_control) {
6744                 int num_out = 0, reason = 0, now_filled = 0;
6745                 struct timeval now;
6746                 int frag_point;
6747
6748                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6749                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6750                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6751         }
6752 no_chunk_output:
6753         if (ret) {
6754                 ca->cnt_failed++;
6755         } else {
6756                 ca->cnt_sent++;
6757         }
6758 }
6759
6760 static void
6761 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6762 {
6763         struct sctp_copy_all *ca;
6764
6765         ca = (struct sctp_copy_all *)ptr;
6766         /*
6767          * Do a notify here? Kacheong suggests that the notify be done at
6768          * the send time.. so you would push up a notification if any send
6769          * failed. Don't know if this is feasable since the only failures we
6770          * have is "memory" related and if you cannot get an mbuf to send
6771          * the data you surely can't get an mbuf to send up to notify the
6772          * user you can't send the data :->
6773          */
6774
6775         /* now free everything */
6776         sctp_m_freem(ca->m);
6777         SCTP_FREE(ca, SCTP_M_COPYAL);
6778 }
6779
6780
6781 #define MC_ALIGN(m, len) do {                                           \
6782         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6783 } while (0)
6784
6785
6786
6787 static struct mbuf *
6788 sctp_copy_out_all(struct uio *uio, int len)
6789 {
6790         struct mbuf *ret, *at;
6791         int left, willcpy, cancpy, error;
6792
6793         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6794         if (ret == NULL) {
6795                 /* TSNH */
6796                 return (NULL);
6797         }
6798         left = len;
6799         SCTP_BUF_LEN(ret) = 0;
6800         /* save space for the data chunk header */
6801         cancpy = M_TRAILINGSPACE(ret);
6802         willcpy = min(cancpy, left);
6803         at = ret;
6804         while (left > 0) {
6805                 /* Align data to the end */
6806                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6807                 if (error) {
6808         err_out_now:
6809                         sctp_m_freem(at);
6810                         return (NULL);
6811                 }
6812                 SCTP_BUF_LEN(at) = willcpy;
6813                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6814                 left -= willcpy;
6815                 if (left > 0) {
6816                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6817                         if (SCTP_BUF_NEXT(at) == NULL) {
6818                                 goto err_out_now;
6819                         }
6820                         at = SCTP_BUF_NEXT(at);
6821                         SCTP_BUF_LEN(at) = 0;
6822                         cancpy = M_TRAILINGSPACE(at);
6823                         willcpy = min(cancpy, left);
6824                 }
6825         }
6826         return (ret);
6827 }
6828
6829 static int
6830 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6831     struct sctp_sndrcvinfo *srcv)
6832 {
6833         int ret;
6834         struct sctp_copy_all *ca;
6835
6836         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6837             SCTP_M_COPYAL);
6838         if (ca == NULL) {
6839                 sctp_m_freem(m);
6840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6841                 return (ENOMEM);
6842         }
6843         memset(ca, 0, sizeof(struct sctp_copy_all));
6844
6845         ca->inp = inp;
6846         if (srcv) {
6847                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6848         }
6849         /*
6850          * take off the sendall flag, it would be bad if we failed to do
6851          * this :-0
6852          */
6853         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6854         /* get length and mbuf chain */
6855         if (uio) {
6856                 ca->sndlen = uio->uio_resid;
6857                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6858                 if (ca->m == NULL) {
6859                         SCTP_FREE(ca, SCTP_M_COPYAL);
6860                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861                         return (ENOMEM);
6862                 }
6863         } else {
6864                 /* Gather the length of the send */
6865                 struct mbuf *mat;
6866
6867                 ca->sndlen = 0;
6868                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6869                         ca->sndlen += SCTP_BUF_LEN(mat);
6870                 }
6871         }
6872         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6873             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6874             SCTP_ASOC_ANY_STATE,
6875             (void *)ca, 0,
6876             sctp_sendall_completes, inp, 1);
6877         if (ret) {
6878                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6879                 SCTP_FREE(ca, SCTP_M_COPYAL);
6880                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6881                 return (EFAULT);
6882         }
6883         return (0);
6884 }
6885
6886
6887 void
6888 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6889 {
6890         struct sctp_tmit_chunk *chk, *nchk;
6891
6892         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6893                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6894                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6895                         if (chk->data) {
6896                                 sctp_m_freem(chk->data);
6897                                 chk->data = NULL;
6898                         }
6899                         asoc->ctrl_queue_cnt--;
6900                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6901                 }
6902         }
6903 }
6904
6905 void
6906 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6907 {
6908         struct sctp_association *asoc;
6909         struct sctp_tmit_chunk *chk, *nchk;
6910         struct sctp_asconf_chunk *acp;
6911
6912         asoc = &stcb->asoc;
6913         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6914                 /* find SCTP_ASCONF chunk in queue */
6915                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6916                         if (chk->data) {
6917                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6918                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6919                                         /* Not Acked yet */
6920                                         break;
6921                                 }
6922                         }
6923                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6924                         if (chk->data) {
6925                                 sctp_m_freem(chk->data);
6926                                 chk->data = NULL;
6927                         }
6928                         asoc->ctrl_queue_cnt--;
6929                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6930                 }
6931         }
6932 }
6933
6934
6935 static void
6936 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6937     struct sctp_association *asoc,
6938     struct sctp_tmit_chunk **data_list,
6939     int bundle_at,
6940     struct sctp_nets *net)
6941 {
6942         int i;
6943         struct sctp_tmit_chunk *tp1;
6944
6945         for (i = 0; i < bundle_at; i++) {
6946                 /* off of the send queue */
6947                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6948                 asoc->send_queue_cnt--;
6949                 if (i > 0) {
6950                         /*
6951                          * Any chunk NOT 0 you zap the time chunk 0 gets
6952                          * zapped or set based on if a RTO measurment is
6953                          * needed.
6954                          */
6955                         data_list[i]->do_rtt = 0;
6956                 }
6957                 /* record time */
6958                 data_list[i]->sent_rcv_time = net->last_sent_time;
6959                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6960                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6961                 if (data_list[i]->whoTo == NULL) {
6962                         data_list[i]->whoTo = net;
6963                         atomic_add_int(&net->ref_count, 1);
6964                 }
6965                 /* on to the sent queue */
6966                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6967                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6968                         struct sctp_tmit_chunk *tpp;
6969
6970                         /* need to move back */
6971         back_up_more:
6972                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6973                         if (tpp == NULL) {
6974                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6975                                 goto all_done;
6976                         }
6977                         tp1 = tpp;
6978                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6979                                 goto back_up_more;
6980                         }
6981                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6982                 } else {
6983                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6984                             data_list[i],
6985                             sctp_next);
6986                 }
6987 all_done:
6988                 /* This does not lower until the cum-ack passes it */
6989                 asoc->sent_queue_cnt++;
6990                 if ((asoc->peers_rwnd <= 0) &&
6991                     (asoc->total_flight == 0) &&
6992                     (bundle_at == 1)) {
6993                         /* Mark the chunk as being a window probe */
6994                         SCTP_STAT_INCR(sctps_windowprobed);
6995                 }
6996 #ifdef SCTP_AUDITING_ENABLED
6997                 sctp_audit_log(0xC2, 3);
6998 #endif
6999                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7000                 data_list[i]->snd_count = 1;
7001                 data_list[i]->rec.data.chunk_was_revoked = 0;
7002                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7003                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7004                             data_list[i]->whoTo->flight_size,
7005                             data_list[i]->book_size,
7006                             (uintptr_t) data_list[i]->whoTo,
7007                             data_list[i]->rec.data.TSN_seq);
7008                 }
7009                 sctp_flight_size_increase(data_list[i]);
7010                 sctp_total_flight_increase(stcb, data_list[i]);
7011                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7012                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7013                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7014                 }
7015                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7016                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7017                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7018                         /* SWS sender side engages */
7019                         asoc->peers_rwnd = 0;
7020                 }
7021         }
7022         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7023                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7024         }
7025 }
7026
7027 static void
7028 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7029 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7030     SCTP_UNUSED
7031 #endif
7032 )
7033 {
7034         struct sctp_tmit_chunk *chk, *nchk;
7035
7036         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7037                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7038                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7039                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7040                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7041                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7042                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7043                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7044                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7045                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7046                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7047                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7048                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7049                         /* Stray chunks must be cleaned up */
7050         clean_up_anyway:
7051                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7052                         if (chk->data) {
7053                                 sctp_m_freem(chk->data);
7054                                 chk->data = NULL;
7055                         }
7056                         asoc->ctrl_queue_cnt--;
7057                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7058                                 asoc->fwd_tsn_cnt--;
7059                         sctp_free_a_chunk(stcb, chk, so_locked);
7060                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7061                         /* special handling, we must look into the param */
7062                         if (chk != asoc->str_reset) {
7063                                 goto clean_up_anyway;
7064                         }
7065                 }
7066         }
7067 }
7068
7069
7070 static int
7071 sctp_can_we_split_this(struct sctp_tcb *stcb,
7072     uint32_t length,
7073     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7074 {
7075         /*
7076          * Make a decision on if I should split a msg into multiple parts.
7077          * This is only asked of incomplete messages.
7078          */
7079         if (eeor_on) {
7080                 /*
7081                  * If we are doing EEOR we need to always send it if its the
7082                  * entire thing, since it might be all the guy is putting in
7083                  * the hopper.
7084                  */
7085                 if (goal_mtu >= length) {
7086                         /*-
7087                          * If we have data outstanding,
7088                          * we get another chance when the sack
7089                          * arrives to transmit - wait for more data
7090                          */
7091                         if (stcb->asoc.total_flight == 0) {
7092                                 /*
7093                                  * If nothing is in flight, we zero the
7094                                  * packet counter.
7095                                  */
7096                                 return (length);
7097                         }
7098                         return (0);
7099
7100                 } else {
7101                         /* You can fill the rest */
7102                         return (goal_mtu);
7103                 }
7104         }
7105         /*-
7106          * For those strange folk that make the send buffer
7107          * smaller than our fragmentation point, we can't
7108          * get a full msg in so we have to allow splitting.
7109          */
7110         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7111                 return (length);
7112         }
7113         if ((length <= goal_mtu) ||
7114             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7115                 /* Sub-optimial residual don't split in non-eeor mode. */
7116                 return (0);
7117         }
7118         /*
7119          * If we reach here length is larger than the goal_mtu. Do we wish
7120          * to split it for the sake of packet putting together?
7121          */
7122         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7123                 /* Its ok to split it */
7124                 return (min(goal_mtu, frag_point));
7125         }
7126         /* Nope, can't split */
7127         return (0);
7128
7129 }
7130
7131 static uint32_t
7132 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7133     struct sctp_stream_out *strq,
7134     uint32_t goal_mtu,
7135     uint32_t frag_point,
7136     int *locked,
7137     int *giveup,
7138     int eeor_mode,
7139     int *bail,
7140     int so_locked
7141 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7142     SCTP_UNUSED
7143 #endif
7144 )
7145 {
7146         /* Move from the stream to the send_queue keeping track of the total */
7147         struct sctp_association *asoc;
7148         struct sctp_stream_queue_pending *sp;
7149         struct sctp_tmit_chunk *chk;
7150         struct sctp_data_chunk *dchkh;
7151         uint32_t to_move, length;
7152         uint8_t rcv_flags = 0;
7153         uint8_t some_taken;
7154         uint8_t send_lock_up = 0;
7155
7156         SCTP_TCB_LOCK_ASSERT(stcb);
7157         asoc = &stcb->asoc;
7158 one_more_time:
7159         /* sa_ignore FREED_MEMORY */
7160         sp = TAILQ_FIRST(&strq->outqueue);
7161         if (sp == NULL) {
7162                 *locked = 0;
7163                 if (send_lock_up == 0) {
7164                         SCTP_TCB_SEND_LOCK(stcb);
7165                         send_lock_up = 1;
7166                 }
7167                 sp = TAILQ_FIRST(&strq->outqueue);
7168                 if (sp) {
7169                         goto one_more_time;
7170                 }
7171                 if (strq->last_msg_incomplete) {
7172                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7173                             strq->stream_no,
7174                             strq->last_msg_incomplete);
7175                         strq->last_msg_incomplete = 0;
7176                 }
7177                 to_move = 0;
7178                 if (send_lock_up) {
7179                         SCTP_TCB_SEND_UNLOCK(stcb);
7180                         send_lock_up = 0;
7181                 }
7182                 goto out_of;
7183         }
7184         if ((sp->msg_is_complete) && (sp->length == 0)) {
7185                 if (sp->sender_all_done) {
7186                         /*
7187                          * We are doing differed cleanup. Last time through
7188                          * when we took all the data the sender_all_done was
7189                          * not set.
7190                          */
7191                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7192                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7193                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7194                                     sp->sender_all_done,
7195                                     sp->length,
7196                                     sp->msg_is_complete,
7197                                     sp->put_last_out,
7198                                     send_lock_up);
7199                         }
7200                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7201                                 SCTP_TCB_SEND_LOCK(stcb);
7202                                 send_lock_up = 1;
7203                         }
7204                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7205                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7206                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7207                         if (sp->net) {
7208                                 sctp_free_remote_addr(sp->net);
7209                                 sp->net = NULL;
7210                         }
7211                         if (sp->data) {
7212                                 sctp_m_freem(sp->data);
7213                                 sp->data = NULL;
7214                         }
7215                         sctp_free_a_strmoq(stcb, sp, so_locked);
7216                         /* we can't be locked to it */
7217                         *locked = 0;
7218                         stcb->asoc.locked_on_sending = NULL;
7219                         if (send_lock_up) {
7220                                 SCTP_TCB_SEND_UNLOCK(stcb);
7221                                 send_lock_up = 0;
7222                         }
7223                         /* back to get the next msg */
7224                         goto one_more_time;
7225                 } else {
7226                         /*
7227                          * sender just finished this but still holds a
7228                          * reference
7229                          */
7230                         *locked = 1;
7231                         *giveup = 1;
7232                         to_move = 0;
7233                         goto out_of;
7234                 }
7235         } else {
7236                 /* is there some to get */
7237                 if (sp->length == 0) {
7238                         /* no */
7239                         *locked = 1;
7240                         *giveup = 1;
7241                         to_move = 0;
7242                         goto out_of;
7243                 } else if (sp->discard_rest) {
7244                         if (send_lock_up == 0) {
7245                                 SCTP_TCB_SEND_LOCK(stcb);
7246                                 send_lock_up = 1;
7247                         }
7248                         /* Whack down the size */
7249                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7250                         if ((stcb->sctp_socket != NULL) && \
7251                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7252                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7253                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7254                         }
7255                         if (sp->data) {
7256                                 sctp_m_freem(sp->data);
7257                                 sp->data = NULL;
7258                                 sp->tail_mbuf = NULL;
7259                         }
7260                         sp->length = 0;
7261                         sp->some_taken = 1;
7262                         *locked = 1;
7263                         *giveup = 1;
7264                         to_move = 0;
7265                         goto out_of;
7266                 }
7267         }
7268         some_taken = sp->some_taken;
7269         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7270                 sp->msg_is_complete = 1;
7271         }
7272 re_look:
7273         length = sp->length;
7274         if (sp->msg_is_complete) {
7275                 /* The message is complete */
7276                 to_move = min(length, frag_point);
7277                 if (to_move == length) {
7278                         /* All of it fits in the MTU */
7279                         if (sp->some_taken) {
7280                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7281                                 sp->put_last_out = 1;
7282                         } else {
7283                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7284                                 sp->put_last_out = 1;
7285                         }
7286                 } else {
7287                         /* Not all of it fits, we fragment */
7288                         if (sp->some_taken == 0) {
7289                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7290                         }
7291                         sp->some_taken = 1;
7292                 }
7293         } else {
7294                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7295                 if (to_move) {
7296                         /*-
7297                          * We use a snapshot of length in case it
7298                          * is expanding during the compare.
7299                          */
7300                         uint32_t llen;
7301
7302                         llen = length;
7303                         if (to_move >= llen) {
7304                                 to_move = llen;
7305                                 if (send_lock_up == 0) {
7306                                         /*-
7307                                          * We are taking all of an incomplete msg
7308                                          * thus we need a send lock.
7309                                          */
7310                                         SCTP_TCB_SEND_LOCK(stcb);
7311                                         send_lock_up = 1;
7312                                         if (sp->msg_is_complete) {
7313                                                 /*
7314                                                  * the sender finished the
7315                                                  * msg
7316                                                  */
7317                                                 goto re_look;
7318                                         }
7319                                 }
7320                         }
7321                         if (sp->some_taken == 0) {
7322                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7323                                 sp->some_taken = 1;
7324                         }
7325                 } else {
7326                         /* Nothing to take. */
7327                         if (sp->some_taken) {
7328                                 *locked = 1;
7329                         }
7330                         *giveup = 1;
7331                         to_move = 0;
7332                         goto out_of;
7333                 }
7334         }
7335
7336         /* If we reach here, we can copy out a chunk */
7337         sctp_alloc_a_chunk(stcb, chk);
7338         if (chk == NULL) {
7339                 /* No chunk memory */
7340                 *giveup = 1;
7341                 to_move = 0;
7342                 goto out_of;
7343         }
7344         /*
7345          * Setup for unordered if needed by looking at the user sent info
7346          * flags.
7347          */
7348         if (sp->sinfo_flags & SCTP_UNORDERED) {
7349                 rcv_flags |= SCTP_DATA_UNORDERED;
7350         }
7351         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7352             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7353                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7354         }
7355         /* clear out the chunk before setting up */
7356         memset(chk, 0, sizeof(*chk));
7357         chk->rec.data.rcv_flags = rcv_flags;
7358
7359         if (to_move >= length) {
7360                 /* we think we can steal the whole thing */
7361                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7362                         SCTP_TCB_SEND_LOCK(stcb);
7363                         send_lock_up = 1;
7364                 }
7365                 if (to_move < sp->length) {
7366                         /* bail, it changed */
7367                         goto dont_do_it;
7368                 }
7369                 chk->data = sp->data;
7370                 chk->last_mbuf = sp->tail_mbuf;
7371                 /* register the stealing */
7372                 sp->data = sp->tail_mbuf = NULL;
7373         } else {
7374                 struct mbuf *m;
7375
7376 dont_do_it:
7377                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7378                 chk->last_mbuf = NULL;
7379                 if (chk->data == NULL) {
7380                         sp->some_taken = some_taken;
7381                         sctp_free_a_chunk(stcb, chk, so_locked);
7382                         *bail = 1;
7383                         to_move = 0;
7384                         goto out_of;
7385                 }
7386 #ifdef SCTP_MBUF_LOGGING
7387                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7388                         struct mbuf *mat;
7389
7390                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7391                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7392                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7393                                 }
7394                         }
7395                 }
7396 #endif
7397                 /* Pull off the data */
7398                 m_adj(sp->data, to_move);
7399                 /* Now lets work our way down and compact it */
7400                 m = sp->data;
7401                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7402                         sp->data = SCTP_BUF_NEXT(m);
7403                         SCTP_BUF_NEXT(m) = NULL;
7404                         if (sp->tail_mbuf == m) {
7405                                 /*-
7406                                  * Freeing tail? TSNH since
7407                                  * we supposedly were taking less
7408                                  * than the sp->length.
7409                                  */
7410 #ifdef INVARIANTS
7411                                 panic("Huh, freing tail? - TSNH");
7412 #else
7413                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7414                                 sp->tail_mbuf = sp->data = NULL;
7415                                 sp->length = 0;
7416 #endif
7417
7418                         }
7419                         sctp_m_free(m);
7420                         m = sp->data;
7421                 }
7422         }
7423         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7424                 chk->copy_by_ref = 1;
7425         } else {
7426                 chk->copy_by_ref = 0;
7427         }
7428         /*
7429          * get last_mbuf and counts of mb useage This is ugly but hopefully
7430          * its only one mbuf.
7431          */
7432         if (chk->last_mbuf == NULL) {
7433                 chk->last_mbuf = chk->data;
7434                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7435                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7436                 }
7437         }
7438         if (to_move > length) {
7439                 /*- This should not happen either
7440                  * since we always lower to_move to the size
7441                  * of sp->length if its larger.
7442                  */
7443 #ifdef INVARIANTS
7444                 panic("Huh, how can to_move be larger?");
7445 #else
7446                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7447                 sp->length = 0;
7448 #endif
7449         } else {
7450                 atomic_subtract_int(&sp->length, to_move);
7451         }
7452         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7453                 /* Not enough room for a chunk header, get some */
7454                 struct mbuf *m;
7455
7456                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7457                 if (m == NULL) {
7458                         /*
7459                          * we're in trouble here. _PREPEND below will free
7460                          * all the data if there is no leading space, so we
7461                          * must put the data back and restore.
7462                          */
7463                         if (send_lock_up == 0) {
7464                                 SCTP_TCB_SEND_LOCK(stcb);
7465                                 send_lock_up = 1;
7466                         }
7467                         if (chk->data == NULL) {
7468                                 /* unsteal the data */
7469                                 sp->data = chk->data;
7470                                 sp->tail_mbuf = chk->last_mbuf;
7471                         } else {
7472                                 struct mbuf *m_tmp;
7473
7474                                 /* reassemble the data */
7475                                 m_tmp = sp->data;
7476                                 sp->data = chk->data;
7477                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7478                         }
7479                         sp->some_taken = some_taken;
7480                         atomic_add_int(&sp->length, to_move);
7481                         chk->data = NULL;
7482                         *bail = 1;
7483                         sctp_free_a_chunk(stcb, chk, so_locked);
7484                         to_move = 0;
7485                         goto out_of;
7486                 } else {
7487                         SCTP_BUF_LEN(m) = 0;
7488                         SCTP_BUF_NEXT(m) = chk->data;
7489                         chk->data = m;
7490                         M_ALIGN(chk->data, 4);
7491                 }
7492         }
7493         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7494         if (chk->data == NULL) {
7495                 /* HELP, TSNH since we assured it would not above? */
7496 #ifdef INVARIANTS
7497                 panic("prepend failes HELP?");
7498 #else
7499                 SCTP_PRINTF("prepend fails HELP?\n");
7500                 sctp_free_a_chunk(stcb, chk, so_locked);
7501 #endif
7502                 *bail = 1;
7503                 to_move = 0;
7504                 goto out_of;
7505         }
7506         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7507         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7508         chk->book_size_scale = 0;
7509         chk->sent = SCTP_DATAGRAM_UNSENT;
7510
7511         chk->flags = 0;
7512         chk->asoc = &stcb->asoc;
7513         chk->pad_inplace = 0;
7514         chk->no_fr_allowed = 0;
7515         chk->rec.data.stream_seq = strq->next_sequence_send;
7516         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7517             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7518                 strq->next_sequence_send++;
7519         }
7520         chk->rec.data.stream_number = sp->stream;
7521         chk->rec.data.payloadtype = sp->ppid;
7522         chk->rec.data.context = sp->context;
7523         chk->rec.data.doing_fast_retransmit = 0;
7524
7525         chk->rec.data.timetodrop = sp->ts;
7526         chk->flags = sp->act_flags;
7527
7528         if (sp->net) {
7529                 chk->whoTo = sp->net;
7530                 atomic_add_int(&chk->whoTo->ref_count, 1);
7531         } else
7532                 chk->whoTo = NULL;
7533
7534         if (sp->holds_key_ref) {
7535                 chk->auth_keyid = sp->auth_keyid;
7536                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7537                 chk->holds_key_ref = 1;
7538         }
7539         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7540         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7541                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7542                     (uintptr_t) stcb, sp->length,
7543                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7544                     chk->rec.data.TSN_seq);
7545         }
7546         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7547         /*
7548          * Put the rest of the things in place now. Size was done earlier in
7549          * previous loop prior to padding.
7550          */
7551
7552 #ifdef SCTP_ASOCLOG_OF_TSNS
7553         SCTP_TCB_LOCK_ASSERT(stcb);
7554         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7555                 asoc->tsn_out_at = 0;
7556                 asoc->tsn_out_wrapped = 1;
7557         }
7558         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7559         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7560         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7561         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7562         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7563         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7564         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7565         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7566         asoc->tsn_out_at++;
7567 #endif
7568
7569         dchkh->ch.chunk_type = SCTP_DATA;
7570         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7571         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7572         dchkh->dp.stream_id = htons(strq->stream_no);
7573         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7574         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7575         dchkh->ch.chunk_length = htons(chk->send_size);
7576         /* Now advance the chk->send_size by the actual pad needed. */
7577         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7578                 /* need a pad */
7579                 struct mbuf *lm;
7580                 int pads;
7581
7582                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7583                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7584                         chk->pad_inplace = 1;
7585                 }
7586                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7587                         /* pad added an mbuf */
7588                         chk->last_mbuf = lm;
7589                 }
7590                 chk->send_size += pads;
7591         }
7592         if (PR_SCTP_ENABLED(chk->flags)) {
7593                 asoc->pr_sctp_cnt++;
7594         }
7595         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7596                 /* All done pull and kill the message */
7597                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7598                 if (sp->put_last_out == 0) {
7599                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7600                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7601                             sp->sender_all_done,
7602                             sp->length,
7603                             sp->msg_is_complete,
7604                             sp->put_last_out,
7605                             send_lock_up);
7606                 }
7607                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7608                         SCTP_TCB_SEND_LOCK(stcb);
7609                         send_lock_up = 1;
7610                 }
7611                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7612                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7613                 if (sp->net) {
7614                         sctp_free_remote_addr(sp->net);
7615                         sp->net = NULL;
7616                 }
7617                 if (sp->data) {
7618                         sctp_m_freem(sp->data);
7619                         sp->data = NULL;
7620                 }
7621                 sctp_free_a_strmoq(stcb, sp, so_locked);
7622
7623                 /* we can't be locked to it */
7624                 *locked = 0;
7625                 stcb->asoc.locked_on_sending = NULL;
7626         } else {
7627                 /* more to go, we are locked */
7628                 *locked = 1;
7629         }
7630         asoc->chunks_on_out_queue++;
7631         strq->chunks_on_queues++;
7632         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7633         asoc->send_queue_cnt++;
7634 out_of:
7635         if (send_lock_up) {
7636                 SCTP_TCB_SEND_UNLOCK(stcb);
7637         }
7638         return (to_move);
7639 }
7640
7641
7642 static void
7643 sctp_fill_outqueue(struct sctp_tcb *stcb,
7644     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7645 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7646     SCTP_UNUSED
7647 #endif
7648 )
7649 {
7650         struct sctp_association *asoc;
7651         struct sctp_stream_out *strq;
7652         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7653         int locked, giveup;
7654
7655         SCTP_TCB_LOCK_ASSERT(stcb);
7656         asoc = &stcb->asoc;
7657         switch (net->ro._l_addr.sa.sa_family) {
7658 #ifdef INET
7659         case AF_INET:
7660                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7661                 break;
7662 #endif
7663 #ifdef INET6
7664         case AF_INET6:
7665                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7666                 break;
7667 #endif
7668         default:
7669                 /* TSNH */
7670                 goal_mtu = net->mtu;
7671                 break;
7672         }
7673         /* Need an allowance for the data chunk header too */
7674         goal_mtu -= sizeof(struct sctp_data_chunk);
7675
7676         /* must make even word boundary */
7677         goal_mtu &= 0xfffffffc;
7678         if (asoc->locked_on_sending) {
7679                 /* We are stuck on one stream until the message completes. */
7680                 strq = asoc->locked_on_sending;
7681                 locked = 1;
7682         } else {
7683                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7684                 locked = 0;
7685         }
7686         while ((goal_mtu > 0) && strq) {
7687                 giveup = 0;
7688                 bail = 0;
7689                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7690                     &giveup, eeor_mode, &bail, so_locked);
7691                 if (moved_how_much)
7692                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7693
7694                 if (locked) {
7695                         asoc->locked_on_sending = strq;
7696                         if ((moved_how_much == 0) || (giveup) || bail)
7697                                 /* no more to move for now */
7698                                 break;
7699                 } else {
7700                         asoc->locked_on_sending = NULL;
7701                         if ((giveup) || bail) {
7702                                 break;
7703                         }
7704                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7705                         if (strq == NULL) {
7706                                 break;
7707                         }
7708                 }
7709                 total_moved += moved_how_much;
7710                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7711                 goal_mtu &= 0xfffffffc;
7712         }
7713         if (bail)
7714                 *quit_now = 1;
7715
7716         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7717
7718         if (total_moved == 0) {
7719                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7720                     (net == stcb->asoc.primary_destination)) {
7721                         /* ran dry for primary network net */
7722                         SCTP_STAT_INCR(sctps_primary_randry);
7723                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7724                         /* ran dry with CMT on */
7725                         SCTP_STAT_INCR(sctps_cmt_randry);
7726                 }
7727         }
7728 }
7729
7730 void
7731 sctp_fix_ecn_echo(struct sctp_association *asoc)
7732 {
7733         struct sctp_tmit_chunk *chk;
7734
7735         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7736                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7737                         chk->sent = SCTP_DATAGRAM_UNSENT;
7738                 }
7739         }
7740 }
7741
7742 void
7743 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7744 {
7745         struct sctp_association *asoc;
7746         struct sctp_tmit_chunk *chk;
7747         struct sctp_stream_queue_pending *sp;
7748         unsigned int i;
7749
7750         if (net == NULL) {
7751                 return;
7752         }
7753         asoc = &stcb->asoc;
7754         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7755                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7756                         if (sp->net == net) {
7757                                 sctp_free_remote_addr(sp->net);
7758                                 sp->net = NULL;
7759                         }
7760                 }
7761         }
7762         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7763                 if (chk->whoTo == net) {
7764                         sctp_free_remote_addr(chk->whoTo);
7765                         chk->whoTo = NULL;
7766                 }
7767         }
7768 }
7769
7770 int
7771 sctp_med_chunk_output(struct sctp_inpcb *inp,
7772     struct sctp_tcb *stcb,
7773     struct sctp_association *asoc,
7774     int *num_out,
7775     int *reason_code,
7776     int control_only, int from_where,
7777     struct timeval *now, int *now_filled, int frag_point, int so_locked
7778 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7779     SCTP_UNUSED
7780 #endif
7781 )
7782 {
7783         /**
7784          * Ok this is the generic chunk service queue. we must do the
7785          * following: - Service the stream queue that is next, moving any
7786          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7787          * LAST to the out queue in one pass) and assigning TSN's - Check to
7788          * see if the cwnd/rwnd allows any output, if so we go ahead and
7789          * fomulate and send the low level chunks. Making sure to combine
7790          * any control in the control chunk queue also.
7791          */
7792         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7793         struct mbuf *outchain, *endoutchain;
7794         struct sctp_tmit_chunk *chk, *nchk;
7795
7796         /* temp arrays for unlinking */
7797         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7798         int no_fragmentflg, error;
7799         unsigned int max_rwnd_per_dest, max_send_per_dest;
7800         int one_chunk, hbflag, skip_data_for_this_net;
7801         int asconf, cookie, no_out_cnt;
7802         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7803         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7804         int tsns_sent = 0;
7805         uint32_t auth_offset = 0;
7806         struct sctp_auth_chunk *auth = NULL;
7807         uint16_t auth_keyid;
7808         int override_ok = 1;
7809         int skip_fill_up = 0;
7810         int data_auth_reqd = 0;
7811
7812         /*
7813          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7814          * destination.
7815          */
7816         int quit_now = 0;
7817
7818         *num_out = 0;
7819         auth_keyid = stcb->asoc.authinfo.active_keyid;
7820
7821         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7822             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7823             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7824                 eeor_mode = 1;
7825         } else {
7826                 eeor_mode = 0;
7827         }
7828         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7829         /*
7830          * First lets prime the pump. For each destination, if there is room
7831          * in the flight size, attempt to pull an MTU's worth out of the
7832          * stream queues into the general send_queue
7833          */
7834 #ifdef SCTP_AUDITING_ENABLED
7835         sctp_audit_log(0xC2, 2);
7836 #endif
7837         SCTP_TCB_LOCK_ASSERT(stcb);
7838         hbflag = 0;
7839         if ((control_only) || (asoc->stream_reset_outstanding))
7840                 no_data_chunks = 1;
7841         else
7842                 no_data_chunks = 0;
7843
7844         /* Nothing to possible to send? */
7845         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7846             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7847             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7848             TAILQ_EMPTY(&asoc->send_queue) &&
7849             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7850 nothing_to_send:
7851                 *reason_code = 9;
7852                 return (0);
7853         }
7854         if (asoc->peers_rwnd == 0) {
7855                 /* No room in peers rwnd */
7856                 *reason_code = 1;
7857                 if (asoc->total_flight > 0) {
7858                         /* we are allowed one chunk in flight */
7859                         no_data_chunks = 1;
7860                 }
7861         }
7862         if (stcb->asoc.ecn_echo_cnt_onq) {
7863                 /* Record where a sack goes, if any */
7864                 if (no_data_chunks &&
7865                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7866                         /* Nothing but ECNe to send - we don't do that */
7867                         goto nothing_to_send;
7868                 }
7869                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7870                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7871                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7872                                 sack_goes_to = chk->whoTo;
7873                                 break;
7874                         }
7875                 }
7876         }
7877         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7878         if (stcb->sctp_socket)
7879                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7880         else
7881                 max_send_per_dest = 0;
7882         if (no_data_chunks == 0) {
7883                 /* How many non-directed chunks are there? */
7884                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7885                         if (chk->whoTo == NULL) {
7886                                 /*
7887                                  * We already have non-directed chunks on
7888                                  * the queue, no need to do a fill-up.
7889                                  */
7890                                 skip_fill_up = 1;
7891                                 break;
7892                         }
7893                 }
7894
7895         }
7896         if ((no_data_chunks == 0) &&
7897             (skip_fill_up == 0) &&
7898             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7899                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7900                         /*
7901                          * This for loop we are in takes in each net, if
7902                          * its's got space in cwnd and has data sent to it
7903                          * (when CMT is off) then it calls
7904                          * sctp_fill_outqueue for the net. This gets data on
7905                          * the send queue for that network.
7906                          *
7907                          * In sctp_fill_outqueue TSN's are assigned and data is
7908                          * copied out of the stream buffers. Note mostly
7909                          * copy by reference (we hope).
7910                          */
7911                         net->window_probe = 0;
7912                         if ((net != stcb->asoc.alternate) &&
7913                             ((net->dest_state & SCTP_ADDR_PF) ||
7914                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7915                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7916                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7917                                         sctp_log_cwnd(stcb, net, 1,
7918                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7919                                 }
7920                                 continue;
7921                         }
7922                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7923                             (net->flight_size == 0)) {
7924                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7925                         }
7926                         if (net->flight_size >= net->cwnd) {
7927                                 /* skip this network, no room - can't fill */
7928                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7929                                         sctp_log_cwnd(stcb, net, 3,
7930                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7931                                 }
7932                                 continue;
7933                         }
7934                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7935                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7936                         }
7937                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7938                         if (quit_now) {
7939                                 /* memory alloc failure */
7940                                 no_data_chunks = 1;
7941                                 break;
7942                         }
7943                 }
7944         }
7945         /* now service each destination and send out what we can for it */
7946         /* Nothing to send? */
7947         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7948             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7949             TAILQ_EMPTY(&asoc->send_queue)) {
7950                 *reason_code = 8;
7951                 return (0);
7952         }
7953         if (asoc->sctp_cmt_on_off > 0) {
7954                 /* get the last start point */
7955                 start_at = asoc->last_net_cmt_send_started;
7956                 if (start_at == NULL) {
7957                         /* null so to beginning */
7958                         start_at = TAILQ_FIRST(&asoc->nets);
7959                 } else {
7960                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7961                         if (start_at == NULL) {
7962                                 start_at = TAILQ_FIRST(&asoc->nets);
7963                         }
7964                 }
7965                 asoc->last_net_cmt_send_started = start_at;
7966         } else {
7967                 start_at = TAILQ_FIRST(&asoc->nets);
7968         }
7969         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7970                 if (chk->whoTo == NULL) {
7971                         if (asoc->alternate) {
7972                                 chk->whoTo = asoc->alternate;
7973                         } else {
7974                                 chk->whoTo = asoc->primary_destination;
7975                         }
7976                         atomic_add_int(&chk->whoTo->ref_count, 1);
7977                 }
7978         }
7979         old_start_at = NULL;
7980 again_one_more_time:
7981         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7982                 /* how much can we send? */
7983                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7984                 if (old_start_at && (old_start_at == net)) {
7985                         /* through list ocmpletely. */
7986                         break;
7987                 }
7988                 tsns_sent = 0xa;
7989                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7990                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7991                     (net->flight_size >= net->cwnd)) {
7992                         /*
7993                          * Nothing on control or asconf and flight is full,
7994                          * we can skip even in the CMT case.
7995                          */
7996                         continue;
7997                 }
7998                 bundle_at = 0;
7999                 endoutchain = outchain = NULL;
8000                 no_fragmentflg = 1;
8001                 one_chunk = 0;
8002                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8003                         skip_data_for_this_net = 1;
8004                 } else {
8005                         skip_data_for_this_net = 0;
8006                 }
8007                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
8008                         /*
8009                          * if we have a route and an ifp check to see if we
8010                          * have room to send to this guy
8011                          */
8012                         struct ifnet *ifp;
8013
8014                         ifp = net->ro.ro_rt->rt_ifp;
8015                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8016                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
8017                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8018                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8019                                 }
8020                                 continue;
8021                         }
8022                 }
8023                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8024 #ifdef INET
8025                 case AF_INET:
8026                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8027                         break;
8028 #endif
8029 #ifdef INET6
8030                 case AF_INET6:
8031                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8032                         break;
8033 #endif
8034                 default:
8035                         /* TSNH */
8036                         mtu = net->mtu;
8037                         break;
8038                 }
8039                 mx_mtu = mtu;
8040                 to_out = 0;
8041                 if (mtu > asoc->peers_rwnd) {
8042                         if (asoc->total_flight > 0) {
8043                                 /* We have a packet in flight somewhere */
8044                                 r_mtu = asoc->peers_rwnd;
8045                         } else {
8046                                 /* We are always allowed to send one MTU out */
8047                                 one_chunk = 1;
8048                                 r_mtu = mtu;
8049                         }
8050                 } else {
8051                         r_mtu = mtu;
8052                 }
8053                 /************************/
8054                 /* ASCONF transmission */
8055                 /************************/
8056                 /* Now first lets go through the asconf queue */
8057                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8058                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8059                                 continue;
8060                         }
8061                         if (chk->whoTo == NULL) {
8062                                 if (asoc->alternate == NULL) {
8063                                         if (asoc->primary_destination != net) {
8064                                                 break;
8065                                         }
8066                                 } else {
8067                                         if (asoc->alternate != net) {
8068                                                 break;
8069                                         }
8070                                 }
8071                         } else {
8072                                 if (chk->whoTo != net) {
8073                                         break;
8074                                 }
8075                         }
8076                         if (chk->data == NULL) {
8077                                 break;
8078                         }
8079                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8080                             chk->sent != SCTP_DATAGRAM_RESEND) {
8081                                 break;
8082                         }
8083                         /*
8084                          * if no AUTH is yet included and this chunk
8085                          * requires it, make sure to account for it.  We
8086                          * don't apply the size until the AUTH chunk is
8087                          * actually added below in case there is no room for
8088                          * this chunk. NOTE: we overload the use of "omtu"
8089                          * here
8090                          */
8091                         if ((auth == NULL) &&
8092                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8093                             stcb->asoc.peer_auth_chunks)) {
8094                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8095                         } else
8096                                 omtu = 0;
8097                         /* Here we do NOT factor the r_mtu */
8098                         if ((chk->send_size < (int)(mtu - omtu)) ||
8099                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8100                                 /*
8101                                  * We probably should glom the mbuf chain
8102                                  * from the chk->data for control but the
8103                                  * problem is it becomes yet one more level
8104                                  * of tracking to do if for some reason
8105                                  * output fails. Then I have got to
8106                                  * reconstruct the merged control chain.. el
8107                                  * yucko.. for now we take the easy way and
8108                                  * do the copy
8109                                  */
8110                                 /*
8111                                  * Add an AUTH chunk, if chunk requires it
8112                                  * save the offset into the chain for AUTH
8113                                  */
8114                                 if ((auth == NULL) &&
8115                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8116                                     stcb->asoc.peer_auth_chunks))) {
8117                                         outchain = sctp_add_auth_chunk(outchain,
8118                                             &endoutchain,
8119                                             &auth,
8120                                             &auth_offset,
8121                                             stcb,
8122                                             chk->rec.chunk_id.id);
8123                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8124                                 }
8125                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8126                                     (int)chk->rec.chunk_id.can_take_data,
8127                                     chk->send_size, chk->copy_by_ref);
8128                                 if (outchain == NULL) {
8129                                         *reason_code = 8;
8130                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8131                                         return (ENOMEM);
8132                                 }
8133                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8134                                 /* update our MTU size */
8135                                 if (mtu > (chk->send_size + omtu))
8136                                         mtu -= (chk->send_size + omtu);
8137                                 else
8138                                         mtu = 0;
8139                                 to_out += (chk->send_size + omtu);
8140                                 /* Do clear IP_DF ? */
8141                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8142                                         no_fragmentflg = 0;
8143                                 }
8144                                 if (chk->rec.chunk_id.can_take_data)
8145                                         chk->data = NULL;
8146                                 /*
8147                                  * set hb flag since we can use these for
8148                                  * RTO
8149                                  */
8150                                 hbflag = 1;
8151                                 asconf = 1;
8152                                 /*
8153                                  * should sysctl this: don't bundle data
8154                                  * with ASCONF since it requires AUTH
8155                                  */
8156                                 no_data_chunks = 1;
8157                                 chk->sent = SCTP_DATAGRAM_SENT;
8158                                 if (chk->whoTo == NULL) {
8159                                         chk->whoTo = net;
8160                                         atomic_add_int(&net->ref_count, 1);
8161                                 }
8162                                 chk->snd_count++;
8163                                 if (mtu == 0) {
8164                                         /*
8165                                          * Ok we are out of room but we can
8166                                          * output without effecting the
8167                                          * flight size since this little guy
8168                                          * is a control only packet.
8169                                          */
8170                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8171                                         /*
8172                                          * do NOT clear the asconf flag as
8173                                          * it is used to do appropriate
8174                                          * source address selection.
8175                                          */
8176                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8177                                             (struct sockaddr *)&net->ro._l_addr,
8178                                             outchain, auth_offset, auth,
8179                                             stcb->asoc.authinfo.active_keyid,
8180                                             no_fragmentflg, 0, asconf,
8181                                             inp->sctp_lport, stcb->rport,
8182                                             htonl(stcb->asoc.peer_vtag),
8183                                             net->port, NULL,
8184                                             0, 0,
8185                                             so_locked))) {
8186                                                 if (error == ENOBUFS) {
8187                                                         asoc->ifp_had_enobuf = 1;
8188                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8189                                                 }
8190                                                 if (from_where == 0) {
8191                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8192                                                 }
8193                                                 if (*now_filled == 0) {
8194                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8195                                                         *now_filled = 1;
8196                                                         *now = net->last_sent_time;
8197                                                 } else {
8198                                                         net->last_sent_time = *now;
8199                                                 }
8200                                                 hbflag = 0;
8201                                                 /* error, could not output */
8202                                                 if (error == EHOSTUNREACH) {
8203                                                         /*
8204                                                          * Destination went
8205                                                          * unreachable
8206                                                          * during this send
8207                                                          */
8208                                                         sctp_move_chunks_from_net(stcb, net);
8209                                                 }
8210                                                 *reason_code = 7;
8211                                                 continue;
8212                                         } else
8213                                                 asoc->ifp_had_enobuf = 0;
8214                                         if (*now_filled == 0) {
8215                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8216                                                 *now_filled = 1;
8217                                                 *now = net->last_sent_time;
8218                                         } else {
8219                                                 net->last_sent_time = *now;
8220                                         }
8221                                         hbflag = 0;
8222                                         /*
8223                                          * increase the number we sent, if a
8224                                          * cookie is sent we don't tell them
8225                                          * any was sent out.
8226                                          */
8227                                         outchain = endoutchain = NULL;
8228                                         auth = NULL;
8229                                         auth_offset = 0;
8230                                         if (!no_out_cnt)
8231                                                 *num_out += ctl_cnt;
8232                                         /* recalc a clean slate and setup */
8233                                         switch (net->ro._l_addr.sa.sa_family) {
8234 #ifdef INET
8235                                         case AF_INET:
8236                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8237                                                 break;
8238 #endif
8239 #ifdef INET6
8240                                         case AF_INET6:
8241                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8242                                                 break;
8243 #endif
8244                                         default:
8245                                                 /* TSNH */
8246                                                 mtu = net->mtu;
8247                                                 break;
8248                                         }
8249                                         to_out = 0;
8250                                         no_fragmentflg = 1;
8251                                 }
8252                         }
8253                 }
8254                 /************************/
8255                 /* Control transmission */
8256                 /************************/
8257                 /* Now first lets go through the control queue */
8258                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8259                         if ((sack_goes_to) &&
8260                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8261                             (chk->whoTo != sack_goes_to)) {
8262                                 /*
8263                                  * if we have a sack in queue, and we are
8264                                  * looking at an ecn echo that is NOT queued
8265                                  * to where the sack is going..
8266                                  */
8267                                 if (chk->whoTo == net) {
8268                                         /*
8269                                          * Don't transmit it to where its
8270                                          * going (current net)
8271                                          */
8272                                         continue;
8273                                 } else if (sack_goes_to == net) {
8274                                         /*
8275                                          * But do transmit it to this
8276                                          * address
8277                                          */
8278                                         goto skip_net_check;
8279                                 }
8280                         }
8281                         if (chk->whoTo == NULL) {
8282                                 if (asoc->alternate == NULL) {
8283                                         if (asoc->primary_destination != net) {
8284                                                 continue;
8285                                         }
8286                                 } else {
8287                                         if (asoc->alternate != net) {
8288                                                 continue;
8289                                         }
8290                                 }
8291                         } else {
8292                                 if (chk->whoTo != net) {
8293                                         continue;
8294                                 }
8295                         }
8296         skip_net_check:
8297                         if (chk->data == NULL) {
8298                                 continue;
8299                         }
8300                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8301                                 /*
8302                                  * It must be unsent. Cookies and ASCONF's
8303                                  * hang around but there timers will force
8304                                  * when marked for resend.
8305                                  */
8306                                 continue;
8307                         }
8308                         /*
8309                          * if no AUTH is yet included and this chunk
8310                          * requires it, make sure to account for it.  We
8311                          * don't apply the size until the AUTH chunk is
8312                          * actually added below in case there is no room for
8313                          * this chunk. NOTE: we overload the use of "omtu"
8314                          * here
8315                          */
8316                         if ((auth == NULL) &&
8317                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8318                             stcb->asoc.peer_auth_chunks)) {
8319                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8320                         } else
8321                                 omtu = 0;
8322                         /* Here we do NOT factor the r_mtu */
8323                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8324                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8325                                 /*
8326                                  * We probably should glom the mbuf chain
8327                                  * from the chk->data for control but the
8328                                  * problem is it becomes yet one more level
8329                                  * of tracking to do if for some reason
8330                                  * output fails. Then I have got to
8331                                  * reconstruct the merged control chain.. el
8332                                  * yucko.. for now we take the easy way and
8333                                  * do the copy
8334                                  */
8335                                 /*
8336                                  * Add an AUTH chunk, if chunk requires it
8337                                  * save the offset into the chain for AUTH
8338                                  */
8339                                 if ((auth == NULL) &&
8340                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8341                                     stcb->asoc.peer_auth_chunks))) {
8342                                         outchain = sctp_add_auth_chunk(outchain,
8343                                             &endoutchain,
8344                                             &auth,
8345                                             &auth_offset,
8346                                             stcb,
8347                                             chk->rec.chunk_id.id);
8348                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8349                                 }
8350                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8351                                     (int)chk->rec.chunk_id.can_take_data,
8352                                     chk->send_size, chk->copy_by_ref);
8353                                 if (outchain == NULL) {
8354                                         *reason_code = 8;
8355                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8356                                         return (ENOMEM);
8357                                 }
8358                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8359                                 /* update our MTU size */
8360                                 if (mtu > (chk->send_size + omtu))
8361                                         mtu -= (chk->send_size + omtu);
8362                                 else
8363                                         mtu = 0;
8364                                 to_out += (chk->send_size + omtu);
8365                                 /* Do clear IP_DF ? */
8366                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8367                                         no_fragmentflg = 0;
8368                                 }
8369                                 if (chk->rec.chunk_id.can_take_data)
8370                                         chk->data = NULL;
8371                                 /* Mark things to be removed, if needed */
8372                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8373                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8374                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8375                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8376                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8377                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8378                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8379                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8380                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8381                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8382                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8383                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8384                                                 hbflag = 1;
8385                                         }
8386                                         /* remove these chunks at the end */
8387                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8388                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8389                                                 /* turn off the timer */
8390                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8391                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8392                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8393                                                 }
8394                                         }
8395                                         ctl_cnt++;
8396                                 } else {
8397                                         /*
8398                                          * Other chunks, since they have
8399                                          * timers running (i.e. COOKIE) we
8400                                          * just "trust" that it gets sent or
8401                                          * retransmitted.
8402                                          */
8403                                         ctl_cnt++;
8404                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8405                                                 cookie = 1;
8406                                                 no_out_cnt = 1;
8407                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8408                                                 /*
8409                                                  * Increment ecne send count
8410                                                  * here this means we may be
8411                                                  * over-zealous in our
8412                                                  * counting if the send
8413                                                  * fails, but its the best
8414                                                  * place to do it (we used
8415                                                  * to do it in the queue of
8416                                                  * the chunk, but that did
8417                                                  * not tell how many times
8418                                                  * it was sent.
8419                                                  */
8420                                                 SCTP_STAT_INCR(sctps_sendecne);
8421                                         }
8422                                         chk->sent = SCTP_DATAGRAM_SENT;
8423                                         if (chk->whoTo == NULL) {
8424                                                 chk->whoTo = net;
8425                                                 atomic_add_int(&net->ref_count, 1);
8426                                         }
8427                                         chk->snd_count++;
8428                                 }
8429                                 if (mtu == 0) {
8430                                         /*
8431                                          * Ok we are out of room but we can
8432                                          * output without effecting the
8433                                          * flight size since this little guy
8434                                          * is a control only packet.
8435                                          */
8436                                         if (asconf) {
8437                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8438                                                 /*
8439                                                  * do NOT clear the asconf
8440                                                  * flag as it is used to do
8441                                                  * appropriate source
8442                                                  * address selection.
8443                                                  */
8444                                         }
8445                                         if (cookie) {
8446                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8447                                                 cookie = 0;
8448                                         }
8449                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8450                                             (struct sockaddr *)&net->ro._l_addr,
8451                                             outchain,
8452                                             auth_offset, auth,
8453                                             stcb->asoc.authinfo.active_keyid,
8454                                             no_fragmentflg, 0, asconf,
8455                                             inp->sctp_lport, stcb->rport,
8456                                             htonl(stcb->asoc.peer_vtag),
8457                                             net->port, NULL,
8458                                             0, 0,
8459                                             so_locked))) {
8460                                                 if (error == ENOBUFS) {
8461                                                         asoc->ifp_had_enobuf = 1;
8462                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8463                                                 }
8464                                                 if (from_where == 0) {
8465                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8466                                                 }
8467                                                 /* error, could not output */
8468                                                 if (hbflag) {
8469                                                         if (*now_filled == 0) {
8470                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8471                                                                 *now_filled = 1;
8472                                                                 *now = net->last_sent_time;
8473                                                         } else {
8474                                                                 net->last_sent_time = *now;
8475                                                         }
8476                                                         hbflag = 0;
8477                                                 }
8478                                                 if (error == EHOSTUNREACH) {
8479                                                         /*
8480                                                          * Destination went
8481                                                          * unreachable
8482                                                          * during this send
8483                                                          */
8484                                                         sctp_move_chunks_from_net(stcb, net);
8485                                                 }
8486                                                 *reason_code = 7;
8487                                                 continue;
8488                                         } else
8489                                                 asoc->ifp_had_enobuf = 0;
8490                                         /* Only HB or ASCONF advances time */
8491                                         if (hbflag) {
8492                                                 if (*now_filled == 0) {
8493                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8494                                                         *now_filled = 1;
8495                                                         *now = net->last_sent_time;
8496                                                 } else {
8497                                                         net->last_sent_time = *now;
8498                                                 }
8499                                                 hbflag = 0;
8500                                         }
8501                                         /*
8502                                          * increase the number we sent, if a
8503                                          * cookie is sent we don't tell them
8504                                          * any was sent out.
8505                                          */
8506                                         outchain = endoutchain = NULL;
8507                                         auth = NULL;
8508                                         auth_offset = 0;
8509                                         if (!no_out_cnt)
8510                                                 *num_out += ctl_cnt;
8511                                         /* recalc a clean slate and setup */
8512                                         switch (net->ro._l_addr.sa.sa_family) {
8513 #ifdef INET
8514                                         case AF_INET:
8515                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8516                                                 break;
8517 #endif
8518 #ifdef INET6
8519                                         case AF_INET6:
8520                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8521                                                 break;
8522 #endif
8523                                         default:
8524                                                 /* TSNH */
8525                                                 mtu = net->mtu;
8526                                                 break;
8527                                         }
8528                                         to_out = 0;
8529                                         no_fragmentflg = 1;
8530                                 }
8531                         }
8532                 }
8533                 /* JRI: if dest is in PF state, do not send data to it */
8534                 if ((asoc->sctp_cmt_on_off > 0) &&
8535                     (net != stcb->asoc.alternate) &&
8536                     (net->dest_state & SCTP_ADDR_PF)) {
8537                         goto no_data_fill;
8538                 }
8539                 if (net->flight_size >= net->cwnd) {
8540                         goto no_data_fill;
8541                 }
8542                 if ((asoc->sctp_cmt_on_off > 0) &&
8543                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8544                     (net->flight_size > max_rwnd_per_dest)) {
8545                         goto no_data_fill;
8546                 }
8547                 /*
8548                  * We need a specific accounting for the usage of the send
8549                  * buffer. We also need to check the number of messages per
8550                  * net. For now, this is better than nothing and it disabled
8551                  * by default...
8552                  */
8553                 if ((asoc->sctp_cmt_on_off > 0) &&
8554                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8555                     (max_send_per_dest > 0) &&
8556                     (net->flight_size > max_send_per_dest)) {
8557                         goto no_data_fill;
8558                 }
8559                 /*********************/
8560                 /* Data transmission */
8561                 /*********************/
8562                 /*
8563                  * if AUTH for DATA is required and no AUTH has been added
8564                  * yet, account for this in the mtu now... if no data can be
8565                  * bundled, this adjustment won't matter anyways since the
8566                  * packet will be going out...
8567                  */
8568                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8569                     stcb->asoc.peer_auth_chunks);
8570                 if (data_auth_reqd && (auth == NULL)) {
8571                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8572                 }
8573                 /* now lets add any data within the MTU constraints */
8574                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8575 #ifdef INET
8576                 case AF_INET:
8577                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8578                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8579                         else
8580                                 omtu = 0;
8581                         break;
8582 #endif
8583 #ifdef INET6
8584                 case AF_INET6:
8585                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8586                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8587                         else
8588                                 omtu = 0;
8589                         break;
8590 #endif
8591                 default:
8592                         /* TSNH */
8593                         omtu = 0;
8594                         break;
8595                 }
8596                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8597                     (skip_data_for_this_net == 0)) ||
8598                     (cookie)) {
8599                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8600                                 if (no_data_chunks) {
8601                                         /* let only control go out */
8602                                         *reason_code = 1;
8603                                         break;
8604                                 }
8605                                 if (net->flight_size >= net->cwnd) {
8606                                         /* skip this net, no room for data */
8607                                         *reason_code = 2;
8608                                         break;
8609                                 }
8610                                 if ((chk->whoTo != NULL) &&
8611                                     (chk->whoTo != net)) {
8612                                         /* Don't send the chunk on this net */
8613                                         continue;
8614                                 }
8615                                 if (asoc->sctp_cmt_on_off == 0) {
8616                                         if ((asoc->alternate) &&
8617                                             (asoc->alternate != net) &&
8618                                             (chk->whoTo == NULL)) {
8619                                                 continue;
8620                                         } else if ((net != asoc->primary_destination) &&
8621                                                     (asoc->alternate == NULL) &&
8622                                             (chk->whoTo == NULL)) {
8623                                                 continue;
8624                                         }
8625                                 }
8626                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8627                                         /*-
8628                                          * strange, we have a chunk that is
8629                                          * to big for its destination and
8630                                          * yet no fragment ok flag.
8631                                          * Something went wrong when the
8632                                          * PMTU changed...we did not mark
8633                                          * this chunk for some reason?? I
8634                                          * will fix it here by letting IP
8635                                          * fragment it for now and printing
8636                                          * a warning. This really should not
8637                                          * happen ...
8638                                          */
8639                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8640                                             chk->send_size, mtu);
8641                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8642                                 }
8643                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8644                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8645                                         struct sctp_data_chunk *dchkh;
8646
8647                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8648                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8649                                 }
8650                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8651                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8652                                         /* ok we will add this one */
8653
8654                                         /*
8655                                          * Add an AUTH chunk, if chunk
8656                                          * requires it, save the offset into
8657                                          * the chain for AUTH
8658                                          */
8659                                         if (data_auth_reqd) {
8660                                                 if (auth == NULL) {
8661                                                         outchain = sctp_add_auth_chunk(outchain,
8662                                                             &endoutchain,
8663                                                             &auth,
8664                                                             &auth_offset,
8665                                                             stcb,
8666                                                             SCTP_DATA);
8667                                                         auth_keyid = chk->auth_keyid;
8668                                                         override_ok = 0;
8669                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8670                                                 } else if (override_ok) {
8671                                                         /*
8672                                                          * use this data's
8673                                                          * keyid
8674                                                          */
8675                                                         auth_keyid = chk->auth_keyid;
8676                                                         override_ok = 0;
8677                                                 } else if (auth_keyid != chk->auth_keyid) {
8678                                                         /*
8679                                                          * different keyid,
8680                                                          * so done bundling
8681                                                          */
8682                                                         break;
8683                                                 }
8684                                         }
8685                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8686                                             chk->send_size, chk->copy_by_ref);
8687                                         if (outchain == NULL) {
8688                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8689                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8690                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8691                                                 }
8692                                                 *reason_code = 3;
8693                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8694                                                 return (ENOMEM);
8695                                         }
8696                                         /* upate our MTU size */
8697                                         /* Do clear IP_DF ? */
8698                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8699                                                 no_fragmentflg = 0;
8700                                         }
8701                                         /* unsigned subtraction of mtu */
8702                                         if (mtu > chk->send_size)
8703                                                 mtu -= chk->send_size;
8704                                         else
8705                                                 mtu = 0;
8706                                         /* unsigned subtraction of r_mtu */
8707                                         if (r_mtu > chk->send_size)
8708                                                 r_mtu -= chk->send_size;
8709                                         else
8710                                                 r_mtu = 0;
8711
8712                                         to_out += chk->send_size;
8713                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8714 #ifdef INVARIANTS
8715                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8716 #else
8717                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8718                                                     mx_mtu, to_out);
8719 #endif
8720                                         }
8721                                         chk->window_probe = 0;
8722                                         data_list[bundle_at++] = chk;
8723                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8724                                                 break;
8725                                         }
8726                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8727                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8728                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8729                                                 } else {
8730                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8731                                                 }
8732                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8733                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8734                                                         /*
8735                                                          * Count number of
8736                                                          * user msg's that
8737                                                          * were fragmented
8738                                                          * we do this by
8739                                                          * counting when we
8740                                                          * see a LAST
8741                                                          * fragment only.
8742                                                          */
8743                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8744                                         }
8745                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8746                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8747                                                         data_list[0]->window_probe = 1;
8748                                                         net->window_probe = 1;
8749                                                 }
8750                                                 break;
8751                                         }
8752                                 } else {
8753                                         /*
8754                                          * Must be sent in order of the
8755                                          * TSN's (on a network)
8756                                          */
8757                                         break;
8758                                 }
8759                         }       /* for (chunk gather loop for this net) */
8760                 }               /* if asoc.state OPEN */
8761 no_data_fill:
8762                 /* Is there something to send for this destination? */
8763                 if (outchain) {
8764                         /* We may need to start a control timer or two */
8765                         if (asconf) {
8766                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8767                                     stcb, net);
8768                                 /*
8769                                  * do NOT clear the asconf flag as it is
8770                                  * used to do appropriate source address
8771                                  * selection.
8772                                  */
8773                         }
8774                         if (cookie) {
8775                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8776                                 cookie = 0;
8777                         }
8778                         /* must start a send timer if data is being sent */
8779                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8780                                 /*
8781                                  * no timer running on this destination
8782                                  * restart it.
8783                                  */
8784                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8785                         }
8786                         /* Now send it, if there is anything to send :> */
8787                         if ((error = sctp_lowlevel_chunk_output(inp,
8788                             stcb,
8789                             net,
8790                             (struct sockaddr *)&net->ro._l_addr,
8791                             outchain,
8792                             auth_offset,
8793                             auth,
8794                             auth_keyid,
8795                             no_fragmentflg,
8796                             bundle_at,
8797                             asconf,
8798                             inp->sctp_lport, stcb->rport,
8799                             htonl(stcb->asoc.peer_vtag),
8800                             net->port, NULL,
8801                             0, 0,
8802                             so_locked))) {
8803                                 /* error, we could not output */
8804                                 if (error == ENOBUFS) {
8805                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8806                                         asoc->ifp_had_enobuf = 1;
8807                                 }
8808                                 if (from_where == 0) {
8809                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8810                                 }
8811                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8812                                 if (hbflag) {
8813                                         if (*now_filled == 0) {
8814                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8815                                                 *now_filled = 1;
8816                                                 *now = net->last_sent_time;
8817                                         } else {
8818                                                 net->last_sent_time = *now;
8819                                         }
8820                                         hbflag = 0;
8821                                 }
8822                                 if (error == EHOSTUNREACH) {
8823                                         /*
8824                                          * Destination went unreachable
8825                                          * during this send
8826                                          */
8827                                         sctp_move_chunks_from_net(stcb, net);
8828                                 }
8829                                 *reason_code = 6;
8830                                 /*-
8831                                  * I add this line to be paranoid. As far as
8832                                  * I can tell the continue, takes us back to
8833                                  * the top of the for, but just to make sure
8834                                  * I will reset these again here.
8835                                  */
8836                                 ctl_cnt = bundle_at = 0;
8837                                 continue;       /* This takes us back to the
8838                                                  * for() for the nets. */
8839                         } else {
8840                                 asoc->ifp_had_enobuf = 0;
8841                         }
8842                         endoutchain = NULL;
8843                         auth = NULL;
8844                         auth_offset = 0;
8845                         if (bundle_at || hbflag) {
8846                                 /* For data/asconf and hb set time */
8847                                 if (*now_filled == 0) {
8848                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8849                                         *now_filled = 1;
8850                                         *now = net->last_sent_time;
8851                                 } else {
8852                                         net->last_sent_time = *now;
8853                                 }
8854                         }
8855                         if (!no_out_cnt) {
8856                                 *num_out += (ctl_cnt + bundle_at);
8857                         }
8858                         if (bundle_at) {
8859                                 /* setup for a RTO measurement */
8860                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8861                                 /* fill time if not already filled */
8862                                 if (*now_filled == 0) {
8863                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8864                                         *now_filled = 1;
8865                                         *now = asoc->time_last_sent;
8866                                 } else {
8867                                         asoc->time_last_sent = *now;
8868                                 }
8869                                 if (net->rto_needed) {
8870                                         data_list[0]->do_rtt = 1;
8871                                         net->rto_needed = 0;
8872                                 }
8873                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8874                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8875                         }
8876                         if (one_chunk) {
8877                                 break;
8878                         }
8879                 }
8880                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8881                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8882                 }
8883         }
8884         if (old_start_at == NULL) {
8885                 old_start_at = start_at;
8886                 start_at = TAILQ_FIRST(&asoc->nets);
8887                 if (old_start_at)
8888                         goto again_one_more_time;
8889         }
8890         /*
8891          * At the end there should be no NON timed chunks hanging on this
8892          * queue.
8893          */
8894         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8895                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8896         }
8897         if ((*num_out == 0) && (*reason_code == 0)) {
8898                 *reason_code = 4;
8899         } else {
8900                 *reason_code = 5;
8901         }
8902         sctp_clean_up_ctl(stcb, asoc, so_locked);
8903         return (0);
8904 }
8905
8906 void
8907 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8908 {
8909         /*-
8910          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8911          * the control chunk queue.
8912          */
8913         struct sctp_chunkhdr *hdr;
8914         struct sctp_tmit_chunk *chk;
8915         struct mbuf *mat;
8916
8917         SCTP_TCB_LOCK_ASSERT(stcb);
8918         sctp_alloc_a_chunk(stcb, chk);
8919         if (chk == NULL) {
8920                 /* no memory */
8921                 sctp_m_freem(op_err);
8922                 return;
8923         }
8924         chk->copy_by_ref = 0;
8925         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8926         if (op_err == NULL) {
8927                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8928                 return;
8929         }
8930         chk->send_size = 0;
8931         mat = op_err;
8932         while (mat != NULL) {
8933                 chk->send_size += SCTP_BUF_LEN(mat);
8934                 mat = SCTP_BUF_NEXT(mat);
8935         }
8936         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8937         chk->rec.chunk_id.can_take_data = 1;
8938         chk->sent = SCTP_DATAGRAM_UNSENT;
8939         chk->snd_count = 0;
8940         chk->flags = 0;
8941         chk->asoc = &stcb->asoc;
8942         chk->data = op_err;
8943         chk->whoTo = NULL;
8944         hdr = mtod(op_err, struct sctp_chunkhdr *);
8945         hdr->chunk_type = SCTP_OPERATION_ERROR;
8946         hdr->chunk_flags = 0;
8947         hdr->chunk_length = htons(chk->send_size);
8948         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8949             chk,
8950             sctp_next);
8951         chk->asoc->ctrl_queue_cnt++;
8952 }
8953
8954 int
8955 sctp_send_cookie_echo(struct mbuf *m,
8956     int offset,
8957     struct sctp_tcb *stcb,
8958     struct sctp_nets *net)
8959 {
8960         /*-
8961          * pull out the cookie and put it at the front of the control chunk
8962          * queue.
8963          */
8964         int at;
8965         struct mbuf *cookie;
8966         struct sctp_paramhdr parm, *phdr;
8967         struct sctp_chunkhdr *hdr;
8968         struct sctp_tmit_chunk *chk;
8969         uint16_t ptype, plen;
8970
8971         /* First find the cookie in the param area */
8972         cookie = NULL;
8973         at = offset + sizeof(struct sctp_init_chunk);
8974
8975         SCTP_TCB_LOCK_ASSERT(stcb);
8976         do {
8977                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8978                 if (phdr == NULL) {
8979                         return (-3);
8980                 }
8981                 ptype = ntohs(phdr->param_type);
8982                 plen = ntohs(phdr->param_length);
8983                 if (ptype == SCTP_STATE_COOKIE) {
8984                         int pad;
8985
8986                         /* found the cookie */
8987                         if ((pad = (plen % 4))) {
8988                                 plen += 4 - pad;
8989                         }
8990                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8991                         if (cookie == NULL) {
8992                                 /* No memory */
8993                                 return (-2);
8994                         }
8995 #ifdef SCTP_MBUF_LOGGING
8996                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8997                                 struct mbuf *mat;
8998
8999                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
9000                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9001                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9002                                         }
9003                                 }
9004                         }
9005 #endif
9006                         break;
9007                 }
9008                 at += SCTP_SIZE32(plen);
9009         } while (phdr);
9010         if (cookie == NULL) {
9011                 /* Did not find the cookie */
9012                 return (-3);
9013         }
9014         /* ok, we got the cookie lets change it into a cookie echo chunk */
9015
9016         /* first the change from param to cookie */
9017         hdr = mtod(cookie, struct sctp_chunkhdr *);
9018         hdr->chunk_type = SCTP_COOKIE_ECHO;
9019         hdr->chunk_flags = 0;
9020         /* get the chunk stuff now and place it in the FRONT of the queue */
9021         sctp_alloc_a_chunk(stcb, chk);
9022         if (chk == NULL) {
9023                 /* no memory */
9024                 sctp_m_freem(cookie);
9025                 return (-5);
9026         }
9027         chk->copy_by_ref = 0;
9028         chk->send_size = plen;
9029         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9030         chk->rec.chunk_id.can_take_data = 0;
9031         chk->sent = SCTP_DATAGRAM_UNSENT;
9032         chk->snd_count = 0;
9033         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9034         chk->asoc = &stcb->asoc;
9035         chk->data = cookie;
9036         chk->whoTo = net;
9037         atomic_add_int(&chk->whoTo->ref_count, 1);
9038         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9039         chk->asoc->ctrl_queue_cnt++;
9040         return (0);
9041 }
9042
9043 void
9044 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9045     struct mbuf *m,
9046     int offset,
9047     int chk_length,
9048     struct sctp_nets *net)
9049 {
9050         /*
9051          * take a HB request and make it into a HB ack and send it.
9052          */
9053         struct mbuf *outchain;
9054         struct sctp_chunkhdr *chdr;
9055         struct sctp_tmit_chunk *chk;
9056
9057
9058         if (net == NULL)
9059                 /* must have a net pointer */
9060                 return;
9061
9062         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9063         if (outchain == NULL) {
9064                 /* gak out of memory */
9065                 return;
9066         }
9067 #ifdef SCTP_MBUF_LOGGING
9068         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9069                 struct mbuf *mat;
9070
9071                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9072                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9073                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9074                         }
9075                 }
9076         }
9077 #endif
9078         chdr = mtod(outchain, struct sctp_chunkhdr *);
9079         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9080         chdr->chunk_flags = 0;
9081         if (chk_length % 4) {
9082                 /* need pad */
9083                 uint32_t cpthis = 0;
9084                 int padlen;
9085
9086                 padlen = 4 - (chk_length % 4);
9087                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9088         }
9089         sctp_alloc_a_chunk(stcb, chk);
9090         if (chk == NULL) {
9091                 /* no memory */
9092                 sctp_m_freem(outchain);
9093                 return;
9094         }
9095         chk->copy_by_ref = 0;
9096         chk->send_size = chk_length;
9097         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9098         chk->rec.chunk_id.can_take_data = 1;
9099         chk->sent = SCTP_DATAGRAM_UNSENT;
9100         chk->snd_count = 0;
9101         chk->flags = 0;
9102         chk->asoc = &stcb->asoc;
9103         chk->data = outchain;
9104         chk->whoTo = net;
9105         atomic_add_int(&chk->whoTo->ref_count, 1);
9106         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9107         chk->asoc->ctrl_queue_cnt++;
9108 }
9109
9110 void
9111 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9112 {
9113         /* formulate and queue a cookie-ack back to sender */
9114         struct mbuf *cookie_ack;
9115         struct sctp_chunkhdr *hdr;
9116         struct sctp_tmit_chunk *chk;
9117
9118         SCTP_TCB_LOCK_ASSERT(stcb);
9119
9120         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9121         if (cookie_ack == NULL) {
9122                 /* no mbuf's */
9123                 return;
9124         }
9125         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9126         sctp_alloc_a_chunk(stcb, chk);
9127         if (chk == NULL) {
9128                 /* no memory */
9129                 sctp_m_freem(cookie_ack);
9130                 return;
9131         }
9132         chk->copy_by_ref = 0;
9133         chk->send_size = sizeof(struct sctp_chunkhdr);
9134         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9135         chk->rec.chunk_id.can_take_data = 1;
9136         chk->sent = SCTP_DATAGRAM_UNSENT;
9137         chk->snd_count = 0;
9138         chk->flags = 0;
9139         chk->asoc = &stcb->asoc;
9140         chk->data = cookie_ack;
9141         if (chk->asoc->last_control_chunk_from != NULL) {
9142                 chk->whoTo = chk->asoc->last_control_chunk_from;
9143                 atomic_add_int(&chk->whoTo->ref_count, 1);
9144         } else {
9145                 chk->whoTo = NULL;
9146         }
9147         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9148         hdr->chunk_type = SCTP_COOKIE_ACK;
9149         hdr->chunk_flags = 0;
9150         hdr->chunk_length = htons(chk->send_size);
9151         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9152         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9153         chk->asoc->ctrl_queue_cnt++;
9154         return;
9155 }
9156
9157
9158 void
9159 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9160 {
9161         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9162         struct mbuf *m_shutdown_ack;
9163         struct sctp_shutdown_ack_chunk *ack_cp;
9164         struct sctp_tmit_chunk *chk;
9165
9166         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9167         if (m_shutdown_ack == NULL) {
9168                 /* no mbuf's */
9169                 return;
9170         }
9171         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9172         sctp_alloc_a_chunk(stcb, chk);
9173         if (chk == NULL) {
9174                 /* no memory */
9175                 sctp_m_freem(m_shutdown_ack);
9176                 return;
9177         }
9178         chk->copy_by_ref = 0;
9179         chk->send_size = sizeof(struct sctp_chunkhdr);
9180         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9181         chk->rec.chunk_id.can_take_data = 1;
9182         chk->sent = SCTP_DATAGRAM_UNSENT;
9183         chk->snd_count = 0;
9184         chk->flags = 0;
9185         chk->asoc = &stcb->asoc;
9186         chk->data = m_shutdown_ack;
9187         chk->whoTo = net;
9188         if (chk->whoTo) {
9189                 atomic_add_int(&chk->whoTo->ref_count, 1);
9190         }
9191         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9192         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9193         ack_cp->ch.chunk_flags = 0;
9194         ack_cp->ch.chunk_length = htons(chk->send_size);
9195         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9196         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9197         chk->asoc->ctrl_queue_cnt++;
9198         return;
9199 }
9200
9201 void
9202 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9203 {
9204         /* formulate and queue a SHUTDOWN to the sender */
9205         struct mbuf *m_shutdown;
9206         struct sctp_shutdown_chunk *shutdown_cp;
9207         struct sctp_tmit_chunk *chk;
9208
9209         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9210         if (m_shutdown == NULL) {
9211                 /* no mbuf's */
9212                 return;
9213         }
9214         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9215         sctp_alloc_a_chunk(stcb, chk);
9216         if (chk == NULL) {
9217                 /* no memory */
9218                 sctp_m_freem(m_shutdown);
9219                 return;
9220         }
9221         chk->copy_by_ref = 0;
9222         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9223         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9224         chk->rec.chunk_id.can_take_data = 1;
9225         chk->sent = SCTP_DATAGRAM_UNSENT;
9226         chk->snd_count = 0;
9227         chk->flags = 0;
9228         chk->asoc = &stcb->asoc;
9229         chk->data = m_shutdown;
9230         chk->whoTo = net;
9231         if (chk->whoTo) {
9232                 atomic_add_int(&chk->whoTo->ref_count, 1);
9233         }
9234         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9235         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9236         shutdown_cp->ch.chunk_flags = 0;
9237         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9238         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9239         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9240         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9241         chk->asoc->ctrl_queue_cnt++;
9242         return;
9243 }
9244
9245 void
9246 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9247 {
9248         /*
9249          * formulate and queue an ASCONF to the peer. ASCONF parameters
9250          * should be queued on the assoc queue.
9251          */
9252         struct sctp_tmit_chunk *chk;
9253         struct mbuf *m_asconf;
9254         int len;
9255
9256         SCTP_TCB_LOCK_ASSERT(stcb);
9257
9258         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9259             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9260                 /* can't send a new one if there is one in flight already */
9261                 return;
9262         }
9263         /* compose an ASCONF chunk, maximum length is PMTU */
9264         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9265         if (m_asconf == NULL) {
9266                 return;
9267         }
9268         sctp_alloc_a_chunk(stcb, chk);
9269         if (chk == NULL) {
9270                 /* no memory */
9271                 sctp_m_freem(m_asconf);
9272                 return;
9273         }
9274         chk->copy_by_ref = 0;
9275         chk->data = m_asconf;
9276         chk->send_size = len;
9277         chk->rec.chunk_id.id = SCTP_ASCONF;
9278         chk->rec.chunk_id.can_take_data = 0;
9279         chk->sent = SCTP_DATAGRAM_UNSENT;
9280         chk->snd_count = 0;
9281         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9282         chk->asoc = &stcb->asoc;
9283         chk->whoTo = net;
9284         if (chk->whoTo) {
9285                 atomic_add_int(&chk->whoTo->ref_count, 1);
9286         }
9287         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9288         chk->asoc->ctrl_queue_cnt++;
9289         return;
9290 }
9291
9292 void
9293 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9294 {
9295         /*
9296          * formulate and queue a asconf-ack back to sender. the asconf-ack
9297          * must be stored in the tcb.
9298          */
9299         struct sctp_tmit_chunk *chk;
9300         struct sctp_asconf_ack *ack, *latest_ack;
9301         struct mbuf *m_ack;
9302         struct sctp_nets *net = NULL;
9303
9304         SCTP_TCB_LOCK_ASSERT(stcb);
9305         /* Get the latest ASCONF-ACK */
9306         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9307         if (latest_ack == NULL) {
9308                 return;
9309         }
9310         if (latest_ack->last_sent_to != NULL &&
9311             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9312                 /* we're doing a retransmission */
9313                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9314                 if (net == NULL) {
9315                         /* no alternate */
9316                         if (stcb->asoc.last_control_chunk_from == NULL) {
9317                                 if (stcb->asoc.alternate) {
9318                                         net = stcb->asoc.alternate;
9319                                 } else {
9320                                         net = stcb->asoc.primary_destination;
9321                                 }
9322                         } else {
9323                                 net = stcb->asoc.last_control_chunk_from;
9324                         }
9325                 }
9326         } else {
9327                 /* normal case */
9328                 if (stcb->asoc.last_control_chunk_from == NULL) {
9329                         if (stcb->asoc.alternate) {
9330                                 net = stcb->asoc.alternate;
9331                         } else {
9332                                 net = stcb->asoc.primary_destination;
9333                         }
9334                 } else {
9335                         net = stcb->asoc.last_control_chunk_from;
9336                 }
9337         }
9338         latest_ack->last_sent_to = net;
9339
9340         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9341                 if (ack->data == NULL) {
9342                         continue;
9343                 }
9344                 /* copy the asconf_ack */
9345                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9346                 if (m_ack == NULL) {
9347                         /* couldn't copy it */
9348                         return;
9349                 }
9350 #ifdef SCTP_MBUF_LOGGING
9351                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9352                         struct mbuf *mat;
9353
9354                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9355                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9356                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9357                                 }
9358                         }
9359                 }
9360 #endif
9361
9362                 sctp_alloc_a_chunk(stcb, chk);
9363                 if (chk == NULL) {
9364                         /* no memory */
9365                         if (m_ack)
9366                                 sctp_m_freem(m_ack);
9367                         return;
9368                 }
9369                 chk->copy_by_ref = 0;
9370
9371                 chk->whoTo = net;
9372                 if (chk->whoTo) {
9373                         atomic_add_int(&chk->whoTo->ref_count, 1);
9374                 }
9375                 chk->data = m_ack;
9376                 chk->send_size = 0;
9377                 /* Get size */
9378                 chk->send_size = ack->len;
9379                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9380                 chk->rec.chunk_id.can_take_data = 1;
9381                 chk->sent = SCTP_DATAGRAM_UNSENT;
9382                 chk->snd_count = 0;
9383                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9384                 chk->asoc = &stcb->asoc;
9385
9386                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9387                 chk->asoc->ctrl_queue_cnt++;
9388         }
9389         return;
9390 }
9391
9392
9393 static int
9394 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9395     struct sctp_tcb *stcb,
9396     struct sctp_association *asoc,
9397     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9398 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9399     SCTP_UNUSED
9400 #endif
9401 )
9402 {
9403         /*-
9404          * send out one MTU of retransmission. If fast_retransmit is
9405          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9406          * rwnd. For a Cookie or Asconf in the control chunk queue we
9407          * retransmit them by themselves.
9408          *
9409          * For data chunks we will pick out the lowest TSN's in the sent_queue
9410          * marked for resend and bundle them all together (up to a MTU of
9411          * destination). The address to send to should have been
9412          * selected/changed where the retransmission was marked (i.e. in FR
9413          * or t3-timeout routines).
9414          */
9415         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9416         struct sctp_tmit_chunk *chk, *fwd;
9417         struct mbuf *m, *endofchain;
9418         struct sctp_nets *net = NULL;
9419         uint32_t tsns_sent = 0;
9420         int no_fragmentflg, bundle_at, cnt_thru;
9421         unsigned int mtu;
9422         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9423         struct sctp_auth_chunk *auth = NULL;
9424         uint32_t auth_offset = 0;
9425         uint16_t auth_keyid;
9426         int override_ok = 1;
9427         int data_auth_reqd = 0;
9428         uint32_t dmtu = 0;
9429
9430         SCTP_TCB_LOCK_ASSERT(stcb);
9431         tmr_started = ctl_cnt = bundle_at = error = 0;
9432         no_fragmentflg = 1;
9433         fwd_tsn = 0;
9434         *cnt_out = 0;
9435         fwd = NULL;
9436         endofchain = m = NULL;
9437         auth_keyid = stcb->asoc.authinfo.active_keyid;
9438 #ifdef SCTP_AUDITING_ENABLED
9439         sctp_audit_log(0xC3, 1);
9440 #endif
9441         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9442             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9443                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9444                     asoc->sent_queue_retran_cnt);
9445                 asoc->sent_queue_cnt = 0;
9446                 asoc->sent_queue_cnt_removeable = 0;
9447                 /* send back 0/0 so we enter normal transmission */
9448                 *cnt_out = 0;
9449                 return (0);
9450         }
9451         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9452                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9453                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9454                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9455                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9456                                 continue;
9457                         }
9458                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9459                                 if (chk != asoc->str_reset) {
9460                                         /*
9461                                          * not eligible for retran if its
9462                                          * not ours
9463                                          */
9464                                         continue;
9465                                 }
9466                         }
9467                         ctl_cnt++;
9468                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9469                                 fwd_tsn = 1;
9470                         }
9471                         /*
9472                          * Add an AUTH chunk, if chunk requires it save the
9473                          * offset into the chain for AUTH
9474                          */
9475                         if ((auth == NULL) &&
9476                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9477                             stcb->asoc.peer_auth_chunks))) {
9478                                 m = sctp_add_auth_chunk(m, &endofchain,
9479                                     &auth, &auth_offset,
9480                                     stcb,
9481                                     chk->rec.chunk_id.id);
9482                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9483                         }
9484                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9485                         break;
9486                 }
9487         }
9488         one_chunk = 0;
9489         cnt_thru = 0;
9490         /* do we have control chunks to retransmit? */
9491         if (m != NULL) {
9492                 /* Start a timer no matter if we suceed or fail */
9493                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9494                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9495                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9496                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9497                 chk->snd_count++;       /* update our count */
9498                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9499                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9500                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9501                     no_fragmentflg, 0, 0,
9502                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9503                     chk->whoTo->port, NULL,
9504                     0, 0,
9505                     so_locked))) {
9506                         SCTP_STAT_INCR(sctps_lowlevelerr);
9507                         return (error);
9508                 }
9509                 endofchain = NULL;
9510                 auth = NULL;
9511                 auth_offset = 0;
9512                 /*
9513                  * We don't want to mark the net->sent time here since this
9514                  * we use this for HB and retrans cannot measure RTT
9515                  */
9516                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9517                 *cnt_out += 1;
9518                 chk->sent = SCTP_DATAGRAM_SENT;
9519                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9520                 if (fwd_tsn == 0) {
9521                         return (0);
9522                 } else {
9523                         /* Clean up the fwd-tsn list */
9524                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9525                         return (0);
9526                 }
9527         }
9528         /*
9529          * Ok, it is just data retransmission we need to do or that and a
9530          * fwd-tsn with it all.
9531          */
9532         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9533                 return (SCTP_RETRAN_DONE);
9534         }
9535         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9536             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9537                 /* not yet open, resend the cookie and that is it */
9538                 return (1);
9539         }
9540 #ifdef SCTP_AUDITING_ENABLED
9541         sctp_auditing(20, inp, stcb, NULL);
9542 #endif
9543         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9544         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9545                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9546                         /* No, not sent to this net or not ready for rtx */
9547                         continue;
9548                 }
9549                 if (chk->data == NULL) {
9550                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9551                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9552                         continue;
9553                 }
9554                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9555                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9556                         /* Gak, we have exceeded max unlucky retran, abort! */
9557                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9558                             chk->snd_count,
9559                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9560                         atomic_add_int(&stcb->asoc.refcnt, 1);
9561                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9562                         SCTP_TCB_LOCK(stcb);
9563                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9564                         return (SCTP_RETRAN_EXIT);
9565                 }
9566                 /* pick up the net */
9567                 net = chk->whoTo;
9568                 switch (net->ro._l_addr.sa.sa_family) {
9569 #ifdef INET
9570                 case AF_INET:
9571                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9572                         break;
9573 #endif
9574 #ifdef INET6
9575                 case AF_INET6:
9576                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9577                         break;
9578 #endif
9579                 default:
9580                         /* TSNH */
9581                         mtu = net->mtu;
9582                         break;
9583                 }
9584
9585                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9586                         /* No room in peers rwnd */
9587                         uint32_t tsn;
9588
9589                         tsn = asoc->last_acked_seq + 1;
9590                         if (tsn == chk->rec.data.TSN_seq) {
9591                                 /*
9592                                  * we make a special exception for this
9593                                  * case. The peer has no rwnd but is missing
9594                                  * the lowest chunk.. which is probably what
9595                                  * is holding up the rwnd.
9596                                  */
9597                                 goto one_chunk_around;
9598                         }
9599                         return (1);
9600                 }
9601 one_chunk_around:
9602                 if (asoc->peers_rwnd < mtu) {
9603                         one_chunk = 1;
9604                         if ((asoc->peers_rwnd == 0) &&
9605                             (asoc->total_flight == 0)) {
9606                                 chk->window_probe = 1;
9607                                 chk->whoTo->window_probe = 1;
9608                         }
9609                 }
9610 #ifdef SCTP_AUDITING_ENABLED
9611                 sctp_audit_log(0xC3, 2);
9612 #endif
9613                 bundle_at = 0;
9614                 m = NULL;
9615                 net->fast_retran_ip = 0;
9616                 if (chk->rec.data.doing_fast_retransmit == 0) {
9617                         /*
9618                          * if no FR in progress skip destination that have
9619                          * flight_size > cwnd.
9620                          */
9621                         if (net->flight_size >= net->cwnd) {
9622                                 continue;
9623                         }
9624                 } else {
9625                         /*
9626                          * Mark the destination net to have FR recovery
9627                          * limits put on it.
9628                          */
9629                         *fr_done = 1;
9630                         net->fast_retran_ip = 1;
9631                 }
9632
9633                 /*
9634                  * if no AUTH is yet included and this chunk requires it,
9635                  * make sure to account for it.  We don't apply the size
9636                  * until the AUTH chunk is actually added below in case
9637                  * there is no room for this chunk.
9638                  */
9639                 if (data_auth_reqd && (auth == NULL)) {
9640                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9641                 } else
9642                         dmtu = 0;
9643
9644                 if ((chk->send_size <= (mtu - dmtu)) ||
9645                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9646                         /* ok we will add this one */
9647                         if (data_auth_reqd) {
9648                                 if (auth == NULL) {
9649                                         m = sctp_add_auth_chunk(m,
9650                                             &endofchain,
9651                                             &auth,
9652                                             &auth_offset,
9653                                             stcb,
9654                                             SCTP_DATA);
9655                                         auth_keyid = chk->auth_keyid;
9656                                         override_ok = 0;
9657                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9658                                 } else if (override_ok) {
9659                                         auth_keyid = chk->auth_keyid;
9660                                         override_ok = 0;
9661                                 } else if (chk->auth_keyid != auth_keyid) {
9662                                         /* different keyid, so done bundling */
9663                                         break;
9664                                 }
9665                         }
9666                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9667                         if (m == NULL) {
9668                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9669                                 return (ENOMEM);
9670                         }
9671                         /* Do clear IP_DF ? */
9672                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9673                                 no_fragmentflg = 0;
9674                         }
9675                         /* upate our MTU size */
9676                         if (mtu > (chk->send_size + dmtu))
9677                                 mtu -= (chk->send_size + dmtu);
9678                         else
9679                                 mtu = 0;
9680                         data_list[bundle_at++] = chk;
9681                         if (one_chunk && (asoc->total_flight <= 0)) {
9682                                 SCTP_STAT_INCR(sctps_windowprobed);
9683                         }
9684                 }
9685                 if (one_chunk == 0) {
9686                         /*
9687                          * now are there anymore forward from chk to pick
9688                          * up?
9689                          */
9690                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9691                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9692                                         /* Nope, not for retran */
9693                                         continue;
9694                                 }
9695                                 if (fwd->whoTo != net) {
9696                                         /* Nope, not the net in question */
9697                                         continue;
9698                                 }
9699                                 if (data_auth_reqd && (auth == NULL)) {
9700                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9701                                 } else
9702                                         dmtu = 0;
9703                                 if (fwd->send_size <= (mtu - dmtu)) {
9704                                         if (data_auth_reqd) {
9705                                                 if (auth == NULL) {
9706                                                         m = sctp_add_auth_chunk(m,
9707                                                             &endofchain,
9708                                                             &auth,
9709                                                             &auth_offset,
9710                                                             stcb,
9711                                                             SCTP_DATA);
9712                                                         auth_keyid = fwd->auth_keyid;
9713                                                         override_ok = 0;
9714                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9715                                                 } else if (override_ok) {
9716                                                         auth_keyid = fwd->auth_keyid;
9717                                                         override_ok = 0;
9718                                                 } else if (fwd->auth_keyid != auth_keyid) {
9719                                                         /*
9720                                                          * different keyid,
9721                                                          * so done bundling
9722                                                          */
9723                                                         break;
9724                                                 }
9725                                         }
9726                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9727                                         if (m == NULL) {
9728                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9729                                                 return (ENOMEM);
9730                                         }
9731                                         /* Do clear IP_DF ? */
9732                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9733                                                 no_fragmentflg = 0;
9734                                         }
9735                                         /* upate our MTU size */
9736                                         if (mtu > (fwd->send_size + dmtu))
9737                                                 mtu -= (fwd->send_size + dmtu);
9738                                         else
9739                                                 mtu = 0;
9740                                         data_list[bundle_at++] = fwd;
9741                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9742                                                 break;
9743                                         }
9744                                 } else {
9745                                         /* can't fit so we are done */
9746                                         break;
9747                                 }
9748                         }
9749                 }
9750                 /* Is there something to send for this destination? */
9751                 if (m) {
9752                         /*
9753                          * No matter if we fail/or suceed we should start a
9754                          * timer. A failure is like a lost IP packet :-)
9755                          */
9756                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9757                                 /*
9758                                  * no timer running on this destination
9759                                  * restart it.
9760                                  */
9761                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9762                                 tmr_started = 1;
9763                         }
9764                         /* Now lets send it, if there is anything to send :> */
9765                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9766                             (struct sockaddr *)&net->ro._l_addr, m,
9767                             auth_offset, auth, auth_keyid,
9768                             no_fragmentflg, 0, 0,
9769                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9770                             net->port, NULL,
9771                             0, 0,
9772                             so_locked))) {
9773                                 /* error, we could not output */
9774                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9775                                 return (error);
9776                         }
9777                         endofchain = NULL;
9778                         auth = NULL;
9779                         auth_offset = 0;
9780                         /* For HB's */
9781                         /*
9782                          * We don't want to mark the net->sent time here
9783                          * since this we use this for HB and retrans cannot
9784                          * measure RTT
9785                          */
9786                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9787
9788                         /* For auto-close */
9789                         cnt_thru++;
9790                         if (*now_filled == 0) {
9791                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9792                                 *now = asoc->time_last_sent;
9793                                 *now_filled = 1;
9794                         } else {
9795                                 asoc->time_last_sent = *now;
9796                         }
9797                         *cnt_out += bundle_at;
9798 #ifdef SCTP_AUDITING_ENABLED
9799                         sctp_audit_log(0xC4, bundle_at);
9800 #endif
9801                         if (bundle_at) {
9802                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9803                         }
9804                         for (i = 0; i < bundle_at; i++) {
9805                                 SCTP_STAT_INCR(sctps_sendretransdata);
9806                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9807                                 /*
9808                                  * When we have a revoked data, and we
9809                                  * retransmit it, then we clear the revoked
9810                                  * flag since this flag dictates if we
9811                                  * subtracted from the fs
9812                                  */
9813                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9814                                         /* Deflate the cwnd */
9815                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9816                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9817                                 }
9818                                 data_list[i]->snd_count++;
9819                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9820                                 /* record the time */
9821                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9822                                 if (data_list[i]->book_size_scale) {
9823                                         /*
9824                                          * need to double the book size on
9825                                          * this one
9826                                          */
9827                                         data_list[i]->book_size_scale = 0;
9828                                         /*
9829                                          * Since we double the booksize, we
9830                                          * must also double the output queue
9831                                          * size, since this get shrunk when
9832                                          * we free by this amount.
9833                                          */
9834                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9835                                         data_list[i]->book_size *= 2;
9836
9837
9838                                 } else {
9839                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9840                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9841                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9842                                         }
9843                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9844                                             (uint32_t) (data_list[i]->send_size +
9845                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9846                                 }
9847                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9848                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9849                                             data_list[i]->whoTo->flight_size,
9850                                             data_list[i]->book_size,
9851                                             (uintptr_t) data_list[i]->whoTo,
9852                                             data_list[i]->rec.data.TSN_seq);
9853                                 }
9854                                 sctp_flight_size_increase(data_list[i]);
9855                                 sctp_total_flight_increase(stcb, data_list[i]);
9856                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9857                                         /* SWS sender side engages */
9858                                         asoc->peers_rwnd = 0;
9859                                 }
9860                                 if ((i == 0) &&
9861                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9862                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9863                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9864                                             (tmr_started == 0)) {
9865                                                 /*-
9866                                                  * ok we just fast-retrans'd
9867                                                  * the lowest TSN, i.e the
9868                                                  * first on the list. In
9869                                                  * this case we want to give
9870                                                  * some more time to get a
9871                                                  * SACK back without a
9872                                                  * t3-expiring.
9873                                                  */
9874                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9875                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9876                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9877                                         }
9878                                 }
9879                         }
9880                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9881                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9882                         }
9883 #ifdef SCTP_AUDITING_ENABLED
9884                         sctp_auditing(21, inp, stcb, NULL);
9885 #endif
9886                 } else {
9887                         /* None will fit */
9888                         return (1);
9889                 }
9890                 if (asoc->sent_queue_retran_cnt <= 0) {
9891                         /* all done we have no more to retran */
9892                         asoc->sent_queue_retran_cnt = 0;
9893                         break;
9894                 }
9895                 if (one_chunk) {
9896                         /* No more room in rwnd */
9897                         return (1);
9898                 }
9899                 /* stop the for loop here. we sent out a packet */
9900                 break;
9901         }
9902         return (0);
9903 }
9904
9905 static void
9906 sctp_timer_validation(struct sctp_inpcb *inp,
9907     struct sctp_tcb *stcb,
9908     struct sctp_association *asoc)
9909 {
9910         struct sctp_nets *net;
9911
9912         /* Validate that a timer is running somewhere */
9913         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9914                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9915                         /* Here is a timer */
9916                         return;
9917                 }
9918         }
9919         SCTP_TCB_LOCK_ASSERT(stcb);
9920         /* Gak, we did not have a timer somewhere */
9921         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9922         if (asoc->alternate) {
9923                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9924         } else {
9925                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9926         }
9927         return;
9928 }
9929
9930 void
9931 sctp_chunk_output(struct sctp_inpcb *inp,
9932     struct sctp_tcb *stcb,
9933     int from_where,
9934     int so_locked
9935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9936     SCTP_UNUSED
9937 #endif
9938 )
9939 {
9940         /*-
9941          * Ok this is the generic chunk service queue. we must do the
9942          * following:
9943          * - See if there are retransmits pending, if so we must
9944          *   do these first.
9945          * - Service the stream queue that is next, moving any
9946          *   message (note I must get a complete message i.e.
9947          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9948          *   TSN's
9949          * - Check to see if the cwnd/rwnd allows any output, if so we
9950          *   go ahead and fomulate and send the low level chunks. Making sure
9951          *   to combine any control in the control chunk queue also.
9952          */
9953         struct sctp_association *asoc;
9954         struct sctp_nets *net;
9955         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9956         unsigned int burst_cnt = 0;
9957         struct timeval now;
9958         int now_filled = 0;
9959         int nagle_on;
9960         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9961         int un_sent = 0;
9962         int fr_done;
9963         unsigned int tot_frs = 0;
9964
9965         asoc = &stcb->asoc;
9966         /* The Nagle algorithm is only applied when handling a send call. */
9967         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9968                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9969                         nagle_on = 0;
9970                 } else {
9971                         nagle_on = 1;
9972                 }
9973         } else {
9974                 nagle_on = 0;
9975         }
9976         SCTP_TCB_LOCK_ASSERT(stcb);
9977
9978         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9979
9980         if ((un_sent <= 0) &&
9981             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9982             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9983             (asoc->sent_queue_retran_cnt == 0)) {
9984                 /* Nothing to do unless there is something to be sent left */
9985                 return;
9986         }
9987         /*
9988          * Do we have something to send, data or control AND a sack timer
9989          * running, if so piggy-back the sack.
9990          */
9991         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9992                 sctp_send_sack(stcb, so_locked);
9993                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9994         }
9995         while (asoc->sent_queue_retran_cnt) {
9996                 /*-
9997                  * Ok, it is retransmission time only, we send out only ONE
9998                  * packet with a single call off to the retran code.
9999                  */
10000                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10001                         /*-
10002                          * Special hook for handling cookiess discarded
10003                          * by peer that carried data. Send cookie-ack only
10004                          * and then the next call with get the retran's.
10005                          */
10006                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10007                             from_where,
10008                             &now, &now_filled, frag_point, so_locked);
10009                         return;
10010                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10011                         /* if its not from a HB then do it */
10012                         fr_done = 0;
10013                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10014                         if (fr_done) {
10015                                 tot_frs++;
10016                         }
10017                 } else {
10018                         /*
10019                          * its from any other place, we don't allow retran
10020                          * output (only control)
10021                          */
10022                         ret = 1;
10023                 }
10024                 if (ret > 0) {
10025                         /* Can't send anymore */
10026                         /*-
10027                          * now lets push out control by calling med-level
10028                          * output once. this assures that we WILL send HB's
10029                          * if queued too.
10030                          */
10031                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10032                             from_where,
10033                             &now, &now_filled, frag_point, so_locked);
10034 #ifdef SCTP_AUDITING_ENABLED
10035                         sctp_auditing(8, inp, stcb, NULL);
10036 #endif
10037                         sctp_timer_validation(inp, stcb, asoc);
10038                         return;
10039                 }
10040                 if (ret < 0) {
10041                         /*-
10042                          * The count was off.. retran is not happening so do
10043                          * the normal retransmission.
10044                          */
10045 #ifdef SCTP_AUDITING_ENABLED
10046                         sctp_auditing(9, inp, stcb, NULL);
10047 #endif
10048                         if (ret == SCTP_RETRAN_EXIT) {
10049                                 return;
10050                         }
10051                         break;
10052                 }
10053                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10054                         /* Only one transmission allowed out of a timeout */
10055 #ifdef SCTP_AUDITING_ENABLED
10056                         sctp_auditing(10, inp, stcb, NULL);
10057 #endif
10058                         /* Push out any control */
10059                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10060                             &now, &now_filled, frag_point, so_locked);
10061                         return;
10062                 }
10063                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10064                         /* Hit FR burst limit */
10065                         return;
10066                 }
10067                 if ((num_out == 0) && (ret == 0)) {
10068                         /* No more retrans to send */
10069                         break;
10070                 }
10071         }
10072 #ifdef SCTP_AUDITING_ENABLED
10073         sctp_auditing(12, inp, stcb, NULL);
10074 #endif
10075         /* Check for bad destinations, if they exist move chunks around. */
10076         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10077                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10078                         /*-
10079                          * if possible move things off of this address we
10080                          * still may send below due to the dormant state but
10081                          * we try to find an alternate address to send to
10082                          * and if we have one we move all queued data on the
10083                          * out wheel to this alternate address.
10084                          */
10085                         if (net->ref_count > 1)
10086                                 sctp_move_chunks_from_net(stcb, net);
10087                 } else {
10088                         /*-
10089                          * if ((asoc->sat_network) || (net->addr_is_local))
10090                          * { burst_limit = asoc->max_burst *
10091                          * SCTP_SAT_NETWORK_BURST_INCR; }
10092                          */
10093                         if (asoc->max_burst > 0) {
10094                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10095                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10096                                                 /*
10097                                                  * JRS - Use the congestion
10098                                                  * control given in the
10099                                                  * congestion control module
10100                                                  */
10101                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10102                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10103                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10104                                                 }
10105                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10106                                         }
10107                                         net->fast_retran_ip = 0;
10108                                 } else {
10109                                         if (net->flight_size == 0) {
10110                                                 /*
10111                                                  * Should be decaying the
10112                                                  * cwnd here
10113                                                  */
10114                                                 ;
10115                                         }
10116                                 }
10117                         }
10118                 }
10119
10120         }
10121         burst_cnt = 0;
10122         do {
10123                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10124                     &reason_code, 0, from_where,
10125                     &now, &now_filled, frag_point, so_locked);
10126                 if (error) {
10127                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10128                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10129                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10130                         }
10131                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10132                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10133                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10134                         }
10135                         break;
10136                 }
10137                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10138
10139                 tot_out += num_out;
10140                 burst_cnt++;
10141                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10142                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10143                         if (num_out == 0) {
10144                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10145                         }
10146                 }
10147                 if (nagle_on) {
10148                         /*
10149                          * When the Nagle algorithm is used, look at how
10150                          * much is unsent, then if its smaller than an MTU
10151                          * and we have data in flight we stop, except if we
10152                          * are handling a fragmented user message.
10153                          */
10154                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10155                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10156                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10157                             (stcb->asoc.total_flight > 0) &&
10158                             ((stcb->asoc.locked_on_sending == NULL) ||
10159                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10160                                 break;
10161                         }
10162                 }
10163                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10164                     TAILQ_EMPTY(&asoc->send_queue) &&
10165                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10166                         /* Nothing left to send */
10167                         break;
10168                 }
10169                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10170                         /* Nothing left to send */
10171                         break;
10172                 }
10173         } while (num_out &&
10174             ((asoc->max_burst == 0) ||
10175             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10176             (burst_cnt < asoc->max_burst)));
10177
10178         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10179                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10180                         SCTP_STAT_INCR(sctps_maxburstqueued);
10181                         asoc->burst_limit_applied = 1;
10182                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10183                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10184                         }
10185                 } else {
10186                         asoc->burst_limit_applied = 0;
10187                 }
10188         }
10189         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10191         }
10192         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10193             tot_out);
10194
10195         /*-
10196          * Now we need to clean up the control chunk chain if a ECNE is on
10197          * it. It must be marked as UNSENT again so next call will continue
10198          * to send it until such time that we get a CWR, to remove it.
10199          */
10200         if (stcb->asoc.ecn_echo_cnt_onq)
10201                 sctp_fix_ecn_echo(asoc);
10202         return;
10203 }
10204
10205
10206 int
10207 sctp_output(
10208     struct sctp_inpcb *inp,
10209     struct mbuf *m,
10210     struct sockaddr *addr,
10211     struct mbuf *control,
10212     struct thread *p,
10213     int flags)
10214 {
10215         if (inp == NULL) {
10216                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10217                 return (EINVAL);
10218         }
10219         if (inp->sctp_socket == NULL) {
10220                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10221                 return (EINVAL);
10222         }
10223         return (sctp_sosend(inp->sctp_socket,
10224             addr,
10225             (struct uio *)NULL,
10226             m,
10227             control,
10228             flags, p
10229             ));
10230 }
10231
10232 void
10233 send_forward_tsn(struct sctp_tcb *stcb,
10234     struct sctp_association *asoc)
10235 {
10236         struct sctp_tmit_chunk *chk;
10237         struct sctp_forward_tsn_chunk *fwdtsn;
10238         uint32_t advance_peer_ack_point;
10239
10240         SCTP_TCB_LOCK_ASSERT(stcb);
10241         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10242                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10243                         /* mark it to unsent */
10244                         chk->sent = SCTP_DATAGRAM_UNSENT;
10245                         chk->snd_count = 0;
10246                         /* Do we correct its output location? */
10247                         if (chk->whoTo) {
10248                                 sctp_free_remote_addr(chk->whoTo);
10249                                 chk->whoTo = NULL;
10250                         }
10251                         goto sctp_fill_in_rest;
10252                 }
10253         }
10254         /* Ok if we reach here we must build one */
10255         sctp_alloc_a_chunk(stcb, chk);
10256         if (chk == NULL) {
10257                 return;
10258         }
10259         asoc->fwd_tsn_cnt++;
10260         chk->copy_by_ref = 0;
10261         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10262         chk->rec.chunk_id.can_take_data = 0;
10263         chk->asoc = asoc;
10264         chk->whoTo = NULL;
10265         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10266         if (chk->data == NULL) {
10267                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10268                 return;
10269         }
10270         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10271         chk->sent = SCTP_DATAGRAM_UNSENT;
10272         chk->snd_count = 0;
10273         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10274         asoc->ctrl_queue_cnt++;
10275 sctp_fill_in_rest:
10276         /*-
10277          * Here we go through and fill out the part that deals with
10278          * stream/seq of the ones we skip.
10279          */
10280         SCTP_BUF_LEN(chk->data) = 0;
10281         {
10282                 struct sctp_tmit_chunk *at, *tp1, *last;
10283                 struct sctp_strseq *strseq;
10284                 unsigned int cnt_of_space, i, ovh;
10285                 unsigned int space_needed;
10286                 unsigned int cnt_of_skipped = 0;
10287
10288                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10289                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10290                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10291                                 /* no more to look at */
10292                                 break;
10293                         }
10294                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10295                                 /* We don't report these */
10296                                 continue;
10297                         }
10298                         cnt_of_skipped++;
10299                 }
10300                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10301                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10302
10303                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10304
10305                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10306                         ovh = SCTP_MIN_OVERHEAD;
10307                 } else {
10308                         ovh = SCTP_MIN_V4_OVERHEAD;
10309                 }
10310                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10311                         /* trim to a mtu size */
10312                         cnt_of_space = asoc->smallest_mtu - ovh;
10313                 }
10314                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10315                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10316                             0xff, 0, cnt_of_skipped,
10317                             asoc->advanced_peer_ack_point);
10318
10319                 }
10320                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10321                 if (cnt_of_space < space_needed) {
10322                         /*-
10323                          * ok we must trim down the chunk by lowering the
10324                          * advance peer ack point.
10325                          */
10326                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10327                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10328                                     0xff, 0xff, cnt_of_space,
10329                                     space_needed);
10330                         }
10331                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10332                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10333                         /*-
10334                          * Go through and find the TSN that will be the one
10335                          * we report.
10336                          */
10337                         at = TAILQ_FIRST(&asoc->sent_queue);
10338                         if (at != NULL) {
10339                                 for (i = 0; i < cnt_of_skipped; i++) {
10340                                         tp1 = TAILQ_NEXT(at, sctp_next);
10341                                         if (tp1 == NULL) {
10342                                                 break;
10343                                         }
10344                                         at = tp1;
10345                                 }
10346                         }
10347                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10348                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10349                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10350                                     asoc->advanced_peer_ack_point);
10351                         }
10352                         last = at;
10353                         /*-
10354                          * last now points to last one I can report, update
10355                          * peer ack point
10356                          */
10357                         if (last)
10358                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10359                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10360                             cnt_of_skipped * sizeof(struct sctp_strseq);
10361                 }
10362                 chk->send_size = space_needed;
10363                 /* Setup the chunk */
10364                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10365                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10366                 fwdtsn->ch.chunk_flags = 0;
10367                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10368                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10369                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10370                 fwdtsn++;
10371                 /*-
10372                  * Move pointer to after the fwdtsn and transfer to the
10373                  * strseq pointer.
10374                  */
10375                 strseq = (struct sctp_strseq *)fwdtsn;
10376                 /*-
10377                  * Now populate the strseq list. This is done blindly
10378                  * without pulling out duplicate stream info. This is
10379                  * inefficent but won't harm the process since the peer will
10380                  * look at these in sequence and will thus release anything.
10381                  * It could mean we exceed the PMTU and chop off some that
10382                  * we could have included.. but this is unlikely (aka 1432/4
10383                  * would mean 300+ stream seq's would have to be reported in
10384                  * one FWD-TSN. With a bit of work we can later FIX this to
10385                  * optimize and pull out duplcates.. but it does add more
10386                  * overhead. So for now... not!
10387                  */
10388                 at = TAILQ_FIRST(&asoc->sent_queue);
10389                 for (i = 0; i < cnt_of_skipped; i++) {
10390                         tp1 = TAILQ_NEXT(at, sctp_next);
10391                         if (tp1 == NULL)
10392                                 break;
10393                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10394                                 /* We don't report these */
10395                                 i--;
10396                                 at = tp1;
10397                                 continue;
10398                         }
10399                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10400                                 at->rec.data.fwd_tsn_cnt = 0;
10401                         }
10402                         strseq->stream = ntohs(at->rec.data.stream_number);
10403                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10404                         strseq++;
10405                         at = tp1;
10406                 }
10407         }
10408         return;
10409 }
10410
10411 void
10412 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10413 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10414     SCTP_UNUSED
10415 #endif
10416 )
10417 {
10418         /*-
10419          * Queue up a SACK or NR-SACK in the control queue.
10420          * We must first check to see if a SACK or NR-SACK is
10421          * somehow on the control queue.
10422          * If so, we will take and and remove the old one.
10423          */
10424         struct sctp_association *asoc;
10425         struct sctp_tmit_chunk *chk, *a_chk;
10426         struct sctp_sack_chunk *sack;
10427         struct sctp_nr_sack_chunk *nr_sack;
10428         struct sctp_gap_ack_block *gap_descriptor;
10429         struct sack_track *selector;
10430         int mergeable = 0;
10431         int offset;
10432         caddr_t limit;
10433         uint32_t *dup;
10434         int limit_reached = 0;
10435         unsigned int i, siz, j;
10436         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10437         int num_dups = 0;
10438         int space_req;
10439         uint32_t highest_tsn;
10440         uint8_t flags;
10441         uint8_t type;
10442         uint8_t tsn_map;
10443
10444         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10445             (stcb->asoc.peer_supports_nr_sack == 1)) {
10446                 type = SCTP_NR_SELECTIVE_ACK;
10447         } else {
10448                 type = SCTP_SELECTIVE_ACK;
10449         }
10450         a_chk = NULL;
10451         asoc = &stcb->asoc;
10452         SCTP_TCB_LOCK_ASSERT(stcb);
10453         if (asoc->last_data_chunk_from == NULL) {
10454                 /* Hmm we never received anything */
10455                 return;
10456         }
10457         sctp_slide_mapping_arrays(stcb);
10458         sctp_set_rwnd(stcb, asoc);
10459         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10460                 if (chk->rec.chunk_id.id == type) {
10461                         /* Hmm, found a sack already on queue, remove it */
10462                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10463                         asoc->ctrl_queue_cnt--;
10464                         a_chk = chk;
10465                         if (a_chk->data) {
10466                                 sctp_m_freem(a_chk->data);
10467                                 a_chk->data = NULL;
10468                         }
10469                         if (a_chk->whoTo) {
10470                                 sctp_free_remote_addr(a_chk->whoTo);
10471                                 a_chk->whoTo = NULL;
10472                         }
10473                         break;
10474                 }
10475         }
10476         if (a_chk == NULL) {
10477                 sctp_alloc_a_chunk(stcb, a_chk);
10478                 if (a_chk == NULL) {
10479                         /* No memory so we drop the idea, and set a timer */
10480                         if (stcb->asoc.delayed_ack) {
10481                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10482                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10483                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10484                                     stcb->sctp_ep, stcb, NULL);
10485                         } else {
10486                                 stcb->asoc.send_sack = 1;
10487                         }
10488                         return;
10489                 }
10490                 a_chk->copy_by_ref = 0;
10491                 a_chk->rec.chunk_id.id = type;
10492                 a_chk->rec.chunk_id.can_take_data = 1;
10493         }
10494         /* Clear our pkt counts */
10495         asoc->data_pkts_seen = 0;
10496
10497         a_chk->asoc = asoc;
10498         a_chk->snd_count = 0;
10499         a_chk->send_size = 0;   /* fill in later */
10500         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10501         a_chk->whoTo = NULL;
10502
10503         if ((asoc->numduptsns) ||
10504             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10505                 /*-
10506                  * Ok, we have some duplicates or the destination for the
10507                  * sack is unreachable, lets see if we can select an
10508                  * alternate than asoc->last_data_chunk_from
10509                  */
10510                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10511                     (asoc->used_alt_onsack > asoc->numnets)) {
10512                         /* We used an alt last time, don't this time */
10513                         a_chk->whoTo = NULL;
10514                 } else {
10515                         asoc->used_alt_onsack++;
10516                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10517                 }
10518                 if (a_chk->whoTo == NULL) {
10519                         /* Nope, no alternate */
10520                         a_chk->whoTo = asoc->last_data_chunk_from;
10521                         asoc->used_alt_onsack = 0;
10522                 }
10523         } else {
10524                 /*
10525                  * No duplicates so we use the last place we received data
10526                  * from.
10527                  */
10528                 asoc->used_alt_onsack = 0;
10529                 a_chk->whoTo = asoc->last_data_chunk_from;
10530         }
10531         if (a_chk->whoTo) {
10532                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10533         }
10534         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10535                 highest_tsn = asoc->highest_tsn_inside_map;
10536         } else {
10537                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10538         }
10539         if (highest_tsn == asoc->cumulative_tsn) {
10540                 /* no gaps */
10541                 if (type == SCTP_SELECTIVE_ACK) {
10542                         space_req = sizeof(struct sctp_sack_chunk);
10543                 } else {
10544                         space_req = sizeof(struct sctp_nr_sack_chunk);
10545                 }
10546         } else {
10547                 /* gaps get a cluster */
10548                 space_req = MCLBYTES;
10549         }
10550         /* Ok now lets formulate a MBUF with our sack */
10551         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10552         if ((a_chk->data == NULL) ||
10553             (a_chk->whoTo == NULL)) {
10554                 /* rats, no mbuf memory */
10555                 if (a_chk->data) {
10556                         /* was a problem with the destination */
10557                         sctp_m_freem(a_chk->data);
10558                         a_chk->data = NULL;
10559                 }
10560                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10561                 /* sa_ignore NO_NULL_CHK */
10562                 if (stcb->asoc.delayed_ack) {
10563                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10564                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10565                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10566                             stcb->sctp_ep, stcb, NULL);
10567                 } else {
10568                         stcb->asoc.send_sack = 1;
10569                 }
10570                 return;
10571         }
10572         /* ok, lets go through and fill it in */
10573         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10574         space = M_TRAILINGSPACE(a_chk->data);
10575         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10576                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10577         }
10578         limit = mtod(a_chk->data, caddr_t);
10579         limit += space;
10580
10581         flags = 0;
10582
10583         if ((asoc->sctp_cmt_on_off > 0) &&
10584             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10585                 /*-
10586                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10587                  * received, then set high bit to 1, else 0. Reset
10588                  * pkts_rcvd.
10589                  */
10590                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10591                 asoc->cmt_dac_pkts_rcvd = 0;
10592         }
10593 #ifdef SCTP_ASOCLOG_OF_TSNS
10594         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10595         stcb->asoc.cumack_log_atsnt++;
10596         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10597                 stcb->asoc.cumack_log_atsnt = 0;
10598         }
10599 #endif
10600         /* reset the readers interpretation */
10601         stcb->freed_by_sorcv_sincelast = 0;
10602
10603         if (type == SCTP_SELECTIVE_ACK) {
10604                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10605                 nr_sack = NULL;
10606                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10607                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10608                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10609                 } else {
10610                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10611                 }
10612         } else {
10613                 sack = NULL;
10614                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10615                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10616                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10617                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10618                 } else {
10619                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10620                 }
10621         }
10622
10623         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10624                 offset = 1;
10625         } else {
10626                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10627         }
10628         if (((type == SCTP_SELECTIVE_ACK) &&
10629             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10630             ((type == SCTP_NR_SELECTIVE_ACK) &&
10631             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10632                 /* we have a gap .. maybe */
10633                 for (i = 0; i < siz; i++) {
10634                         tsn_map = asoc->mapping_array[i];
10635                         if (type == SCTP_SELECTIVE_ACK) {
10636                                 tsn_map |= asoc->nr_mapping_array[i];
10637                         }
10638                         if (i == 0) {
10639                                 /*
10640                                  * Clear all bits corresponding to TSNs
10641                                  * smaller or equal to the cumulative TSN.
10642                                  */
10643                                 tsn_map &= (~0 << (1 - offset));
10644                         }
10645                         selector = &sack_array[tsn_map];
10646                         if (mergeable && selector->right_edge) {
10647                                 /*
10648                                  * Backup, left and right edges were ok to
10649                                  * merge.
10650                                  */
10651                                 num_gap_blocks--;
10652                                 gap_descriptor--;
10653                         }
10654                         if (selector->num_entries == 0)
10655                                 mergeable = 0;
10656                         else {
10657                                 for (j = 0; j < selector->num_entries; j++) {
10658                                         if (mergeable && selector->right_edge) {
10659                                                 /*
10660                                                  * do a merge by NOT setting
10661                                                  * the left side
10662                                                  */
10663                                                 mergeable = 0;
10664                                         } else {
10665                                                 /*
10666                                                  * no merge, set the left
10667                                                  * side
10668                                                  */
10669                                                 mergeable = 0;
10670                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10671                                         }
10672                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10673                                         num_gap_blocks++;
10674                                         gap_descriptor++;
10675                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10676                                                 /* no more room */
10677                                                 limit_reached = 1;
10678                                                 break;
10679                                         }
10680                                 }
10681                                 if (selector->left_edge) {
10682                                         mergeable = 1;
10683                                 }
10684                         }
10685                         if (limit_reached) {
10686                                 /* Reached the limit stop */
10687                                 break;
10688                         }
10689                         offset += 8;
10690                 }
10691         }
10692         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10693             (limit_reached == 0)) {
10694
10695                 mergeable = 0;
10696
10697                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10698                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10699                 } else {
10700                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10701                 }
10702
10703                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10704                         offset = 1;
10705                 } else {
10706                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10707                 }
10708                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10709                         /* we have a gap .. maybe */
10710                         for (i = 0; i < siz; i++) {
10711                                 tsn_map = asoc->nr_mapping_array[i];
10712                                 if (i == 0) {
10713                                         /*
10714                                          * Clear all bits corresponding to
10715                                          * TSNs smaller or equal to the
10716                                          * cumulative TSN.
10717                                          */
10718                                         tsn_map &= (~0 << (1 - offset));
10719                                 }
10720                                 selector = &sack_array[tsn_map];
10721                                 if (mergeable && selector->right_edge) {
10722                                         /*
10723                                          * Backup, left and right edges were
10724                                          * ok to merge.
10725                                          */
10726                                         num_nr_gap_blocks--;
10727                                         gap_descriptor--;
10728                                 }
10729                                 if (selector->num_entries == 0)
10730                                         mergeable = 0;
10731                                 else {
10732                                         for (j = 0; j < selector->num_entries; j++) {
10733                                                 if (mergeable && selector->right_edge) {
10734                                                         /*
10735                                                          * do a merge by NOT
10736                                                          * setting the left
10737                                                          * side
10738                                                          */
10739                                                         mergeable = 0;
10740                                                 } else {
10741                                                         /*
10742                                                          * no merge, set the
10743                                                          * left side
10744                                                          */
10745                                                         mergeable = 0;
10746                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10747                                                 }
10748                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10749                                                 num_nr_gap_blocks++;
10750                                                 gap_descriptor++;
10751                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10752                                                         /* no more room */
10753                                                         limit_reached = 1;
10754                                                         break;
10755                                                 }
10756                                         }
10757                                         if (selector->left_edge) {
10758                                                 mergeable = 1;
10759                                         }
10760                                 }
10761                                 if (limit_reached) {
10762                                         /* Reached the limit stop */
10763                                         break;
10764                                 }
10765                                 offset += 8;
10766                         }
10767                 }
10768         }
10769         /* now we must add any dups we are going to report. */
10770         if ((limit_reached == 0) && (asoc->numduptsns)) {
10771                 dup = (uint32_t *) gap_descriptor;
10772                 for (i = 0; i < asoc->numduptsns; i++) {
10773                         *dup = htonl(asoc->dup_tsns[i]);
10774                         dup++;
10775                         num_dups++;
10776                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10777                                 /* no more room */
10778                                 break;
10779                         }
10780                 }
10781                 asoc->numduptsns = 0;
10782         }
10783         /*
10784          * now that the chunk is prepared queue it to the control chunk
10785          * queue.
10786          */
10787         if (type == SCTP_SELECTIVE_ACK) {
10788                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10789                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10790                     num_dups * sizeof(int32_t);
10791                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10792                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10793                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10794                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10795                 sack->sack.num_dup_tsns = htons(num_dups);
10796                 sack->ch.chunk_type = type;
10797                 sack->ch.chunk_flags = flags;
10798                 sack->ch.chunk_length = htons(a_chk->send_size);
10799         } else {
10800                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10801                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10802                     num_dups * sizeof(int32_t);
10803                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10804                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10805                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10806                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10807                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10808                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10809                 nr_sack->nr_sack.reserved = 0;
10810                 nr_sack->ch.chunk_type = type;
10811                 nr_sack->ch.chunk_flags = flags;
10812                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10813         }
10814         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10815         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10816         asoc->ctrl_queue_cnt++;
10817         asoc->send_sack = 0;
10818         SCTP_STAT_INCR(sctps_sendsacks);
10819         return;
10820 }
10821
10822 void
10823 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10824 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10825     SCTP_UNUSED
10826 #endif
10827 )
10828 {
10829         struct mbuf *m_abort, *m, *m_last;
10830         struct mbuf *m_out, *m_end = NULL;
10831         struct sctp_abort_chunk *abort;
10832         struct sctp_auth_chunk *auth = NULL;
10833         struct sctp_nets *net;
10834         uint32_t vtag;
10835         uint32_t auth_offset = 0;
10836         uint16_t cause_len, chunk_len, padding_len;
10837
10838         SCTP_TCB_LOCK_ASSERT(stcb);
10839         /*-
10840          * Add an AUTH chunk, if chunk requires it and save the offset into
10841          * the chain for AUTH
10842          */
10843         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10844             stcb->asoc.peer_auth_chunks)) {
10845                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10846                     stcb, SCTP_ABORT_ASSOCIATION);
10847                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10848         } else {
10849                 m_out = NULL;
10850         }
10851         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10852         if (m_abort == NULL) {
10853                 if (m_out) {
10854                         sctp_m_freem(m_out);
10855                 }
10856                 if (operr) {
10857                         sctp_m_freem(operr);
10858                 }
10859                 return;
10860         }
10861         /* link in any error */
10862         SCTP_BUF_NEXT(m_abort) = operr;
10863         cause_len = 0;
10864         m_last = NULL;
10865         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10866                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10867                 if (SCTP_BUF_NEXT(m) == NULL) {
10868                         m_last = m;
10869                 }
10870         }
10871         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10872         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10873         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10874         if (m_out == NULL) {
10875                 /* NO Auth chunk prepended, so reserve space in front */
10876                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10877                 m_out = m_abort;
10878         } else {
10879                 /* Put AUTH chunk at the front of the chain */
10880                 SCTP_BUF_NEXT(m_end) = m_abort;
10881         }
10882         if (stcb->asoc.alternate) {
10883                 net = stcb->asoc.alternate;
10884         } else {
10885                 net = stcb->asoc.primary_destination;
10886         }
10887         /* Fill in the ABORT chunk header. */
10888         abort = mtod(m_abort, struct sctp_abort_chunk *);
10889         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10890         if (stcb->asoc.peer_vtag == 0) {
10891                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10892                 vtag = stcb->asoc.my_vtag;
10893                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10894         } else {
10895                 vtag = stcb->asoc.peer_vtag;
10896                 abort->ch.chunk_flags = 0;
10897         }
10898         abort->ch.chunk_length = htons(chunk_len);
10899         /* Add padding, if necessary. */
10900         if (padding_len > 0) {
10901                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10902                         sctp_m_freem(m_out);
10903                         return;
10904                 }
10905         }
10906         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10907             (struct sockaddr *)&net->ro._l_addr,
10908             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10909             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10910             stcb->asoc.primary_destination->port, NULL,
10911             0, 0,
10912             so_locked);
10913         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10914 }
10915
10916 void
10917 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10918     struct sctp_nets *net,
10919     int reflect_vtag)
10920 {
10921         /* formulate and SEND a SHUTDOWN-COMPLETE */
10922         struct mbuf *m_shutdown_comp;
10923         struct sctp_shutdown_complete_chunk *shutdown_complete;
10924         uint32_t vtag;
10925         uint8_t flags;
10926
10927         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10928         if (m_shutdown_comp == NULL) {
10929                 /* no mbuf's */
10930                 return;
10931         }
10932         if (reflect_vtag) {
10933                 flags = SCTP_HAD_NO_TCB;
10934                 vtag = stcb->asoc.my_vtag;
10935         } else {
10936                 flags = 0;
10937                 vtag = stcb->asoc.peer_vtag;
10938         }
10939         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10940         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10941         shutdown_complete->ch.chunk_flags = flags;
10942         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10943         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10944         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10945             (struct sockaddr *)&net->ro._l_addr,
10946             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10947             stcb->sctp_ep->sctp_lport, stcb->rport,
10948             htonl(vtag),
10949             net->port, NULL,
10950             0, 0,
10951             SCTP_SO_NOT_LOCKED);
10952         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10953         return;
10954 }
10955
10956 static void
10957 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10958     struct sctphdr *sh, uint32_t vtag,
10959     uint8_t type, struct mbuf *cause,
10960     uint8_t use_mflowid, uint32_t mflowid,
10961     uint32_t vrf_id, uint16_t port)
10962 {
10963         struct mbuf *o_pak;
10964         struct mbuf *mout;
10965         struct sctphdr *shout;
10966         struct sctp_chunkhdr *ch;
10967         struct udphdr *udp;
10968         int len, cause_len, padding_len;
10969
10970 #if defined(INET) || defined(INET6)
10971         int ret;
10972
10973 #endif
10974 #ifdef INET
10975         struct sockaddr_in *src_sin, *dst_sin;
10976         struct ip *ip;
10977
10978 #endif
10979 #ifdef INET6
10980         struct sockaddr_in6 *src_sin6, *dst_sin6;
10981         struct ip6_hdr *ip6;
10982
10983 #endif
10984
10985         /* Compute the length of the cause and add final padding. */
10986         cause_len = 0;
10987         if (cause != NULL) {
10988                 struct mbuf *m_at, *m_last = NULL;
10989
10990                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10991                         if (SCTP_BUF_NEXT(m_at) == NULL)
10992                                 m_last = m_at;
10993                         cause_len += SCTP_BUF_LEN(m_at);
10994                 }
10995                 padding_len = cause_len % 4;
10996                 if (padding_len != 0) {
10997                         padding_len = 4 - padding_len;
10998                 }
10999                 if (padding_len != 0) {
11000                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
11001                                 sctp_m_freem(cause);
11002                                 return;
11003                         }
11004                 }
11005         } else {
11006                 padding_len = 0;
11007         }
11008         /* Get an mbuf for the header. */
11009         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11010         switch (dst->sa_family) {
11011 #ifdef INET
11012         case AF_INET:
11013                 len += sizeof(struct ip);
11014                 break;
11015 #endif
11016 #ifdef INET6
11017         case AF_INET6:
11018                 len += sizeof(struct ip6_hdr);
11019                 break;
11020 #endif
11021         default:
11022                 break;
11023         }
11024         if (port) {
11025                 len += sizeof(struct udphdr);
11026         }
11027         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11028         if (mout == NULL) {
11029                 if (cause) {
11030                         sctp_m_freem(cause);
11031                 }
11032                 return;
11033         }
11034         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11035         SCTP_BUF_LEN(mout) = len;
11036         SCTP_BUF_NEXT(mout) = cause;
11037         if (use_mflowid != 0) {
11038                 mout->m_pkthdr.flowid = mflowid;
11039                 mout->m_flags |= M_FLOWID;
11040         }
11041 #ifdef INET
11042         ip = NULL;
11043 #endif
11044 #ifdef INET6
11045         ip6 = NULL;
11046 #endif
11047         switch (dst->sa_family) {
11048 #ifdef INET
11049         case AF_INET:
11050                 src_sin = (struct sockaddr_in *)src;
11051                 dst_sin = (struct sockaddr_in *)dst;
11052                 ip = mtod(mout, struct ip *);
11053                 ip->ip_v = IPVERSION;
11054                 ip->ip_hl = (sizeof(struct ip) >> 2);
11055                 ip->ip_tos = 0;
11056                 ip->ip_id = ip_newid();
11057                 ip->ip_off = 0;
11058                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11059                 if (port) {
11060                         ip->ip_p = IPPROTO_UDP;
11061                 } else {
11062                         ip->ip_p = IPPROTO_SCTP;
11063                 }
11064                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11065                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11066                 ip->ip_sum = 0;
11067                 len = sizeof(struct ip);
11068                 shout = (struct sctphdr *)((caddr_t)ip + len);
11069                 break;
11070 #endif
11071 #ifdef INET6
11072         case AF_INET6:
11073                 src_sin6 = (struct sockaddr_in6 *)src;
11074                 dst_sin6 = (struct sockaddr_in6 *)dst;
11075                 ip6 = mtod(mout, struct ip6_hdr *);
11076                 ip6->ip6_flow = htonl(0x60000000);
11077                 if (V_ip6_auto_flowlabel) {
11078                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11079                 }
11080                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11081                 if (port) {
11082                         ip6->ip6_nxt = IPPROTO_UDP;
11083                 } else {
11084                         ip6->ip6_nxt = IPPROTO_SCTP;
11085                 }
11086                 ip6->ip6_src = dst_sin6->sin6_addr;
11087                 ip6->ip6_dst = src_sin6->sin6_addr;
11088                 len = sizeof(struct ip6_hdr);
11089                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11090                 break;
11091 #endif
11092         default:
11093                 len = 0;
11094                 shout = mtod(mout, struct sctphdr *);
11095                 break;
11096         }
11097         if (port) {
11098                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11099                         sctp_m_freem(mout);
11100                         return;
11101                 }
11102                 udp = (struct udphdr *)shout;
11103                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11104                 udp->uh_dport = port;
11105                 udp->uh_sum = 0;
11106                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11107                     sizeof(struct sctphdr) +
11108                     sizeof(struct sctp_chunkhdr) +
11109                     cause_len + padding_len);
11110                 len += sizeof(struct udphdr);
11111                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11112         } else {
11113                 udp = NULL;
11114         }
11115         shout->src_port = sh->dest_port;
11116         shout->dest_port = sh->src_port;
11117         shout->checksum = 0;
11118         if (vtag) {
11119                 shout->v_tag = htonl(vtag);
11120         } else {
11121                 shout->v_tag = sh->v_tag;
11122         }
11123         len += sizeof(struct sctphdr);
11124         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11125         ch->chunk_type = type;
11126         if (vtag) {
11127                 ch->chunk_flags = 0;
11128         } else {
11129                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11130         }
11131         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11132         len += sizeof(struct sctp_chunkhdr);
11133         len += cause_len + padding_len;
11134
11135         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11136                 sctp_m_freem(mout);
11137                 return;
11138         }
11139         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11140         switch (dst->sa_family) {
11141 #ifdef INET
11142         case AF_INET:
11143                 if (port) {
11144                         if (V_udp_cksum) {
11145                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11146                         } else {
11147                                 udp->uh_sum = 0;
11148                         }
11149                 }
11150                 ip->ip_len = len;
11151                 if (port) {
11152 #if defined(SCTP_WITH_NO_CSUM)
11153                         SCTP_STAT_INCR(sctps_sendnocrc);
11154 #else
11155                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11156                         SCTP_STAT_INCR(sctps_sendswcrc);
11157 #endif
11158                         if (V_udp_cksum) {
11159                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11160                         }
11161                 } else {
11162 #if defined(SCTP_WITH_NO_CSUM)
11163                         SCTP_STAT_INCR(sctps_sendnocrc);
11164 #else
11165                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11166                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11167                         SCTP_STAT_INCR(sctps_sendhwcrc);
11168 #endif
11169                 }
11170 #ifdef SCTP_PACKET_LOGGING
11171                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11172                         sctp_packet_log(o_pak);
11173                 }
11174 #endif
11175                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11176                 break;
11177 #endif
11178 #ifdef INET6
11179         case AF_INET6:
11180                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11181                 if (port) {
11182 #if defined(SCTP_WITH_NO_CSUM)
11183                         SCTP_STAT_INCR(sctps_sendnocrc);
11184 #else
11185                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11186                         SCTP_STAT_INCR(sctps_sendswcrc);
11187 #endif
11188                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11189                                 udp->uh_sum = 0xffff;
11190                         }
11191                 } else {
11192 #if defined(SCTP_WITH_NO_CSUM)
11193                         SCTP_STAT_INCR(sctps_sendnocrc);
11194 #else
11195                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11196                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11197                         SCTP_STAT_INCR(sctps_sendhwcrc);
11198 #endif
11199                 }
11200 #ifdef SCTP_PACKET_LOGGING
11201                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11202                         sctp_packet_log(o_pak);
11203                 }
11204 #endif
11205                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11206                 break;
11207 #endif
11208         default:
11209                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11210                     dst->sa_family);
11211                 sctp_m_freem(mout);
11212                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11213                 return;
11214         }
11215         SCTP_STAT_INCR(sctps_sendpackets);
11216         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11217         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11218         return;
11219 }
11220
11221 void
11222 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11223     struct sctphdr *sh,
11224     uint8_t use_mflowid, uint32_t mflowid,
11225     uint32_t vrf_id, uint16_t port)
11226 {
11227         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11228             use_mflowid, mflowid,
11229             vrf_id, port);
11230 }
11231
11232 void
11233 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11234 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11235     SCTP_UNUSED
11236 #endif
11237 )
11238 {
11239         struct sctp_tmit_chunk *chk;
11240         struct sctp_heartbeat_chunk *hb;
11241         struct timeval now;
11242
11243         SCTP_TCB_LOCK_ASSERT(stcb);
11244         if (net == NULL) {
11245                 return;
11246         }
11247         (void)SCTP_GETTIME_TIMEVAL(&now);
11248         switch (net->ro._l_addr.sa.sa_family) {
11249 #ifdef INET
11250         case AF_INET:
11251                 break;
11252 #endif
11253 #ifdef INET6
11254         case AF_INET6:
11255                 break;
11256 #endif
11257         default:
11258                 return;
11259         }
11260         sctp_alloc_a_chunk(stcb, chk);
11261         if (chk == NULL) {
11262                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11263                 return;
11264         }
11265         chk->copy_by_ref = 0;
11266         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11267         chk->rec.chunk_id.can_take_data = 1;
11268         chk->asoc = &stcb->asoc;
11269         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11270
11271         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11272         if (chk->data == NULL) {
11273                 sctp_free_a_chunk(stcb, chk, so_locked);
11274                 return;
11275         }
11276         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11277         SCTP_BUF_LEN(chk->data) = chk->send_size;
11278         chk->sent = SCTP_DATAGRAM_UNSENT;
11279         chk->snd_count = 0;
11280         chk->whoTo = net;
11281         atomic_add_int(&chk->whoTo->ref_count, 1);
11282         /* Now we have a mbuf that we can fill in with the details */
11283         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11284         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11285         /* fill out chunk header */
11286         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11287         hb->ch.chunk_flags = 0;
11288         hb->ch.chunk_length = htons(chk->send_size);
11289         /* Fill out hb parameter */
11290         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11291         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11292         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11293         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11294         /* Did our user request this one, put it in */
11295         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11296         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11297         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11298                 /*
11299                  * we only take from the entropy pool if the address is not
11300                  * confirmed.
11301                  */
11302                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11303                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11304         } else {
11305                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11306                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11307         }
11308         switch (net->ro._l_addr.sa.sa_family) {
11309 #ifdef INET
11310         case AF_INET:
11311                 memcpy(hb->heartbeat.hb_info.address,
11312                     &net->ro._l_addr.sin.sin_addr,
11313                     sizeof(net->ro._l_addr.sin.sin_addr));
11314                 break;
11315 #endif
11316 #ifdef INET6
11317         case AF_INET6:
11318                 memcpy(hb->heartbeat.hb_info.address,
11319                     &net->ro._l_addr.sin6.sin6_addr,
11320                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11321                 break;
11322 #endif
11323         default:
11324                 return;
11325                 break;
11326         }
11327         net->hb_responded = 0;
11328         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11329         stcb->asoc.ctrl_queue_cnt++;
11330         SCTP_STAT_INCR(sctps_sendheartbeat);
11331         return;
11332 }
11333
11334 void
11335 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11336     uint32_t high_tsn)
11337 {
11338         struct sctp_association *asoc;
11339         struct sctp_ecne_chunk *ecne;
11340         struct sctp_tmit_chunk *chk;
11341
11342         if (net == NULL) {
11343                 return;
11344         }
11345         asoc = &stcb->asoc;
11346         SCTP_TCB_LOCK_ASSERT(stcb);
11347         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11348                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11349                         /* found a previous ECN_ECHO update it if needed */
11350                         uint32_t cnt, ctsn;
11351
11352                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11353                         ctsn = ntohl(ecne->tsn);
11354                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11355                                 ecne->tsn = htonl(high_tsn);
11356                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11357                         }
11358                         cnt = ntohl(ecne->num_pkts_since_cwr);
11359                         cnt++;
11360                         ecne->num_pkts_since_cwr = htonl(cnt);
11361                         return;
11362                 }
11363         }
11364         /* nope could not find one to update so we must build one */
11365         sctp_alloc_a_chunk(stcb, chk);
11366         if (chk == NULL) {
11367                 return;
11368         }
11369         chk->copy_by_ref = 0;
11370         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11371         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11372         chk->rec.chunk_id.can_take_data = 0;
11373         chk->asoc = &stcb->asoc;
11374         chk->send_size = sizeof(struct sctp_ecne_chunk);
11375         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11376         if (chk->data == NULL) {
11377                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11378                 return;
11379         }
11380         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11381         SCTP_BUF_LEN(chk->data) = chk->send_size;
11382         chk->sent = SCTP_DATAGRAM_UNSENT;
11383         chk->snd_count = 0;
11384         chk->whoTo = net;
11385         atomic_add_int(&chk->whoTo->ref_count, 1);
11386
11387         stcb->asoc.ecn_echo_cnt_onq++;
11388         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11389         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11390         ecne->ch.chunk_flags = 0;
11391         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11392         ecne->tsn = htonl(high_tsn);
11393         ecne->num_pkts_since_cwr = htonl(1);
11394         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11395         asoc->ctrl_queue_cnt++;
11396 }
11397
11398 void
11399 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11400     struct mbuf *m, int len, int iphlen, int bad_crc)
11401 {
11402         struct sctp_association *asoc;
11403         struct sctp_pktdrop_chunk *drp;
11404         struct sctp_tmit_chunk *chk;
11405         uint8_t *datap;
11406         int was_trunc = 0;
11407         int fullsz = 0;
11408         long spc;
11409         int offset;
11410         struct sctp_chunkhdr *ch, chunk_buf;
11411         unsigned int chk_length;
11412
11413         if (!stcb) {
11414                 return;
11415         }
11416         asoc = &stcb->asoc;
11417         SCTP_TCB_LOCK_ASSERT(stcb);
11418         if (asoc->peer_supports_pktdrop == 0) {
11419                 /*-
11420                  * peer must declare support before I send one.
11421                  */
11422                 return;
11423         }
11424         if (stcb->sctp_socket == NULL) {
11425                 return;
11426         }
11427         sctp_alloc_a_chunk(stcb, chk);
11428         if (chk == NULL) {
11429                 return;
11430         }
11431         chk->copy_by_ref = 0;
11432         len -= iphlen;
11433         chk->send_size = len;
11434         /* Validate that we do not have an ABORT in here. */
11435         offset = iphlen + sizeof(struct sctphdr);
11436         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11437             sizeof(*ch), (uint8_t *) & chunk_buf);
11438         while (ch != NULL) {
11439                 chk_length = ntohs(ch->chunk_length);
11440                 if (chk_length < sizeof(*ch)) {
11441                         /* break to abort land */
11442                         break;
11443                 }
11444                 switch (ch->chunk_type) {
11445                 case SCTP_PACKET_DROPPED:
11446                 case SCTP_ABORT_ASSOCIATION:
11447                 case SCTP_INITIATION_ACK:
11448                         /**
11449                          * We don't respond with an PKT-DROP to an ABORT
11450                          * or PKT-DROP. We also do not respond to an
11451                          * INIT-ACK, because we can't know if the initiation
11452                          * tag is correct or not.
11453                          */
11454                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11455                         return;
11456                 default:
11457                         break;
11458                 }
11459                 offset += SCTP_SIZE32(chk_length);
11460                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11461                     sizeof(*ch), (uint8_t *) & chunk_buf);
11462         }
11463
11464         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11465             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11466                 /*
11467                  * only send 1 mtu worth, trim off the excess on the end.
11468                  */
11469                 fullsz = len;
11470                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11471                 was_trunc = 1;
11472         }
11473         chk->asoc = &stcb->asoc;
11474         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11475         if (chk->data == NULL) {
11476 jump_out:
11477                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11478                 return;
11479         }
11480         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11481         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11482         if (drp == NULL) {
11483                 sctp_m_freem(chk->data);
11484                 chk->data = NULL;
11485                 goto jump_out;
11486         }
11487         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11488             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11489         chk->book_size_scale = 0;
11490         if (was_trunc) {
11491                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11492                 drp->trunc_len = htons(fullsz);
11493                 /*
11494                  * Len is already adjusted to size minus overhead above take
11495                  * out the pkt_drop chunk itself from it.
11496                  */
11497                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11498                 len = chk->send_size;
11499         } else {
11500                 /* no truncation needed */
11501                 drp->ch.chunk_flags = 0;
11502                 drp->trunc_len = htons(0);
11503         }
11504         if (bad_crc) {
11505                 drp->ch.chunk_flags |= SCTP_BADCRC;
11506         }
11507         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11508         SCTP_BUF_LEN(chk->data) = chk->send_size;
11509         chk->sent = SCTP_DATAGRAM_UNSENT;
11510         chk->snd_count = 0;
11511         if (net) {
11512                 /* we should hit here */
11513                 chk->whoTo = net;
11514                 atomic_add_int(&chk->whoTo->ref_count, 1);
11515         } else {
11516                 chk->whoTo = NULL;
11517         }
11518         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11519         chk->rec.chunk_id.can_take_data = 1;
11520         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11521         drp->ch.chunk_length = htons(chk->send_size);
11522         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11523         if (spc < 0) {
11524                 spc = 0;
11525         }
11526         drp->bottle_bw = htonl(spc);
11527         if (asoc->my_rwnd) {
11528                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11529                     asoc->size_on_all_streams +
11530                     asoc->my_rwnd_control_len +
11531                     stcb->sctp_socket->so_rcv.sb_cc);
11532         } else {
11533                 /*-
11534                  * If my rwnd is 0, possibly from mbuf depletion as well as
11535                  * space used, tell the peer there is NO space aka onq == bw
11536                  */
11537                 drp->current_onq = htonl(spc);
11538         }
11539         drp->reserved = 0;
11540         datap = drp->data;
11541         m_copydata(m, iphlen, len, (caddr_t)datap);
11542         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11543         asoc->ctrl_queue_cnt++;
11544 }
11545
11546 void
11547 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11548 {
11549         struct sctp_association *asoc;
11550         struct sctp_cwr_chunk *cwr;
11551         struct sctp_tmit_chunk *chk;
11552
11553         SCTP_TCB_LOCK_ASSERT(stcb);
11554         if (net == NULL) {
11555                 return;
11556         }
11557         asoc = &stcb->asoc;
11558         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11559                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11560                         /*
11561                          * found a previous CWR queued to same destination
11562                          * update it if needed
11563                          */
11564                         uint32_t ctsn;
11565
11566                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11567                         ctsn = ntohl(cwr->tsn);
11568                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11569                                 cwr->tsn = htonl(high_tsn);
11570                         }
11571                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11572                                 /* Make sure override is carried */
11573                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11574                         }
11575                         return;
11576                 }
11577         }
11578         sctp_alloc_a_chunk(stcb, chk);
11579         if (chk == NULL) {
11580                 return;
11581         }
11582         chk->copy_by_ref = 0;
11583         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11584         chk->rec.chunk_id.can_take_data = 1;
11585         chk->asoc = &stcb->asoc;
11586         chk->send_size = sizeof(struct sctp_cwr_chunk);
11587         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11588         if (chk->data == NULL) {
11589                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11590                 return;
11591         }
11592         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         chk->sent = SCTP_DATAGRAM_UNSENT;
11595         chk->snd_count = 0;
11596         chk->whoTo = net;
11597         atomic_add_int(&chk->whoTo->ref_count, 1);
11598         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11599         cwr->ch.chunk_type = SCTP_ECN_CWR;
11600         cwr->ch.chunk_flags = override;
11601         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11602         cwr->tsn = htonl(high_tsn);
11603         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11604         asoc->ctrl_queue_cnt++;
11605 }
11606
11607 void
11608 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11609     int number_entries, uint16_t * list,
11610     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11611 {
11612         uint16_t len, old_len, i;
11613         struct sctp_stream_reset_out_request *req_out;
11614         struct sctp_chunkhdr *ch;
11615
11616         ch = mtod(chk->data, struct sctp_chunkhdr *);
11617         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11618
11619         /* get to new offset for the param. */
11620         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11621         /* now how long will this param be? */
11622         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11623         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11624         req_out->ph.param_length = htons(len);
11625         req_out->request_seq = htonl(seq);
11626         req_out->response_seq = htonl(resp_seq);
11627         req_out->send_reset_at_tsn = htonl(last_sent);
11628         if (number_entries) {
11629                 for (i = 0; i < number_entries; i++) {
11630                         req_out->list_of_streams[i] = htons(list[i]);
11631                 }
11632         }
11633         if (SCTP_SIZE32(len) > len) {
11634                 /*-
11635                  * Need to worry about the pad we may end up adding to the
11636                  * end. This is easy since the struct is either aligned to 4
11637                  * bytes or 2 bytes off.
11638                  */
11639                 req_out->list_of_streams[number_entries] = 0;
11640         }
11641         /* now fix the chunk length */
11642         ch->chunk_length = htons(len + old_len);
11643         chk->book_size = len + old_len;
11644         chk->book_size_scale = 0;
11645         chk->send_size = SCTP_SIZE32(chk->book_size);
11646         SCTP_BUF_LEN(chk->data) = chk->send_size;
11647         return;
11648 }
11649
11650 static void
11651 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11652     int number_entries, uint16_t * list,
11653     uint32_t seq)
11654 {
11655         uint16_t len, old_len, i;
11656         struct sctp_stream_reset_in_request *req_in;
11657         struct sctp_chunkhdr *ch;
11658
11659         ch = mtod(chk->data, struct sctp_chunkhdr *);
11660         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11661
11662         /* get to new offset for the param. */
11663         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11664         /* now how long will this param be? */
11665         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11666         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11667         req_in->ph.param_length = htons(len);
11668         req_in->request_seq = htonl(seq);
11669         if (number_entries) {
11670                 for (i = 0; i < number_entries; i++) {
11671                         req_in->list_of_streams[i] = htons(list[i]);
11672                 }
11673         }
11674         if (SCTP_SIZE32(len) > len) {
11675                 /*-
11676                  * Need to worry about the pad we may end up adding to the
11677                  * end. This is easy since the struct is either aligned to 4
11678                  * bytes or 2 bytes off.
11679                  */
11680                 req_in->list_of_streams[number_entries] = 0;
11681         }
11682         /* now fix the chunk length */
11683         ch->chunk_length = htons(len + old_len);
11684         chk->book_size = len + old_len;
11685         chk->book_size_scale = 0;
11686         chk->send_size = SCTP_SIZE32(chk->book_size);
11687         SCTP_BUF_LEN(chk->data) = chk->send_size;
11688         return;
11689 }
11690
11691 static void
11692 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11693     uint32_t seq)
11694 {
11695         uint16_t len, old_len;
11696         struct sctp_stream_reset_tsn_request *req_tsn;
11697         struct sctp_chunkhdr *ch;
11698
11699         ch = mtod(chk->data, struct sctp_chunkhdr *);
11700         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701
11702         /* get to new offset for the param. */
11703         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11704         /* now how long will this param be? */
11705         len = sizeof(struct sctp_stream_reset_tsn_request);
11706         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11707         req_tsn->ph.param_length = htons(len);
11708         req_tsn->request_seq = htonl(seq);
11709
11710         /* now fix the chunk length */
11711         ch->chunk_length = htons(len + old_len);
11712         chk->send_size = len + old_len;
11713         chk->book_size = SCTP_SIZE32(chk->send_size);
11714         chk->book_size_scale = 0;
11715         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11716         return;
11717 }
11718
11719 void
11720 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11721     uint32_t resp_seq, uint32_t result)
11722 {
11723         uint16_t len, old_len;
11724         struct sctp_stream_reset_response *resp;
11725         struct sctp_chunkhdr *ch;
11726
11727         ch = mtod(chk->data, struct sctp_chunkhdr *);
11728         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11729
11730         /* get to new offset for the param. */
11731         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11732         /* now how long will this param be? */
11733         len = sizeof(struct sctp_stream_reset_response);
11734         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11735         resp->ph.param_length = htons(len);
11736         resp->response_seq = htonl(resp_seq);
11737         resp->result = ntohl(result);
11738
11739         /* now fix the chunk length */
11740         ch->chunk_length = htons(len + old_len);
11741         chk->book_size = len + old_len;
11742         chk->book_size_scale = 0;
11743         chk->send_size = SCTP_SIZE32(chk->book_size);
11744         SCTP_BUF_LEN(chk->data) = chk->send_size;
11745         return;
11746 }
11747
11748 void
11749 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11750     uint32_t resp_seq, uint32_t result,
11751     uint32_t send_una, uint32_t recv_next)
11752 {
11753         uint16_t len, old_len;
11754         struct sctp_stream_reset_response_tsn *resp;
11755         struct sctp_chunkhdr *ch;
11756
11757         ch = mtod(chk->data, struct sctp_chunkhdr *);
11758         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11759
11760         /* get to new offset for the param. */
11761         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11762         /* now how long will this param be? */
11763         len = sizeof(struct sctp_stream_reset_response_tsn);
11764         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11765         resp->ph.param_length = htons(len);
11766         resp->response_seq = htonl(resp_seq);
11767         resp->result = htonl(result);
11768         resp->senders_next_tsn = htonl(send_una);
11769         resp->receivers_next_tsn = htonl(recv_next);
11770
11771         /* now fix the chunk length */
11772         ch->chunk_length = htons(len + old_len);
11773         chk->book_size = len + old_len;
11774         chk->send_size = SCTP_SIZE32(chk->book_size);
11775         chk->book_size_scale = 0;
11776         SCTP_BUF_LEN(chk->data) = chk->send_size;
11777         return;
11778 }
11779
11780 static void
11781 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11782     uint32_t seq,
11783     uint16_t adding)
11784 {
11785         uint16_t len, old_len;
11786         struct sctp_chunkhdr *ch;
11787         struct sctp_stream_reset_add_strm *addstr;
11788
11789         ch = mtod(chk->data, struct sctp_chunkhdr *);
11790         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11791
11792         /* get to new offset for the param. */
11793         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11794         /* now how long will this param be? */
11795         len = sizeof(struct sctp_stream_reset_add_strm);
11796
11797         /* Fill it out. */
11798         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11799         addstr->ph.param_length = htons(len);
11800         addstr->request_seq = htonl(seq);
11801         addstr->number_of_streams = htons(adding);
11802         addstr->reserved = 0;
11803
11804         /* now fix the chunk length */
11805         ch->chunk_length = htons(len + old_len);
11806         chk->send_size = len + old_len;
11807         chk->book_size = SCTP_SIZE32(chk->send_size);
11808         chk->book_size_scale = 0;
11809         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11810         return;
11811 }
11812
11813 static void
11814 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11815     uint32_t seq,
11816     uint16_t adding)
11817 {
11818         uint16_t len, old_len;
11819         struct sctp_chunkhdr *ch;
11820         struct sctp_stream_reset_add_strm *addstr;
11821
11822         ch = mtod(chk->data, struct sctp_chunkhdr *);
11823         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11824
11825         /* get to new offset for the param. */
11826         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11827         /* now how long will this param be? */
11828         len = sizeof(struct sctp_stream_reset_add_strm);
11829         /* Fill it out. */
11830         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11831         addstr->ph.param_length = htons(len);
11832         addstr->request_seq = htonl(seq);
11833         addstr->number_of_streams = htons(adding);
11834         addstr->reserved = 0;
11835
11836         /* now fix the chunk length */
11837         ch->chunk_length = htons(len + old_len);
11838         chk->send_size = len + old_len;
11839         chk->book_size = SCTP_SIZE32(chk->send_size);
11840         chk->book_size_scale = 0;
11841         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11842         return;
11843 }
11844
11845 int
11846 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11847     int number_entries, uint16_t * list,
11848     uint8_t send_out_req,
11849     uint8_t send_in_req,
11850     uint8_t send_tsn_req,
11851     uint8_t add_stream,
11852     uint16_t adding_o,
11853     uint16_t adding_i, uint8_t peer_asked)
11854 {
11855
11856         struct sctp_association *asoc;
11857         struct sctp_tmit_chunk *chk;
11858         struct sctp_chunkhdr *ch;
11859         uint32_t seq;
11860
11861         asoc = &stcb->asoc;
11862         if (asoc->stream_reset_outstanding) {
11863                 /*-
11864                  * Already one pending, must get ACK back to clear the flag.
11865                  */
11866                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11867                 return (EBUSY);
11868         }
11869         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11870             (add_stream == 0)) {
11871                 /* nothing to do */
11872                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11873                 return (EINVAL);
11874         }
11875         if (send_tsn_req && (send_out_req || send_in_req)) {
11876                 /* error, can't do that */
11877                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11878                 return (EINVAL);
11879         }
11880         sctp_alloc_a_chunk(stcb, chk);
11881         if (chk == NULL) {
11882                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11883                 return (ENOMEM);
11884         }
11885         chk->copy_by_ref = 0;
11886         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11887         chk->rec.chunk_id.can_take_data = 0;
11888         chk->asoc = &stcb->asoc;
11889         chk->book_size = sizeof(struct sctp_chunkhdr);
11890         chk->send_size = SCTP_SIZE32(chk->book_size);
11891         chk->book_size_scale = 0;
11892
11893         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11894         if (chk->data == NULL) {
11895                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11896                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897                 return (ENOMEM);
11898         }
11899         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11900
11901         /* setup chunk parameters */
11902         chk->sent = SCTP_DATAGRAM_UNSENT;
11903         chk->snd_count = 0;
11904         if (stcb->asoc.alternate) {
11905                 chk->whoTo = stcb->asoc.alternate;
11906         } else {
11907                 chk->whoTo = stcb->asoc.primary_destination;
11908         }
11909         atomic_add_int(&chk->whoTo->ref_count, 1);
11910         ch = mtod(chk->data, struct sctp_chunkhdr *);
11911         ch->chunk_type = SCTP_STREAM_RESET;
11912         ch->chunk_flags = 0;
11913         ch->chunk_length = htons(chk->book_size);
11914         SCTP_BUF_LEN(chk->data) = chk->send_size;
11915
11916         seq = stcb->asoc.str_reset_seq_out;
11917         if (send_out_req) {
11918                 sctp_add_stream_reset_out(chk, number_entries, list,
11919                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11920                 asoc->stream_reset_out_is_outstanding = 1;
11921                 seq++;
11922                 asoc->stream_reset_outstanding++;
11923         }
11924         if ((add_stream & 1) &&
11925             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11926                 /* Need to allocate more */
11927                 struct sctp_stream_out *oldstream;
11928                 struct sctp_stream_queue_pending *sp, *nsp;
11929                 int i;
11930
11931                 oldstream = stcb->asoc.strmout;
11932                 /* get some more */
11933                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11934                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11935                     SCTP_M_STRMO);
11936                 if (stcb->asoc.strmout == NULL) {
11937                         uint8_t x;
11938
11939                         stcb->asoc.strmout = oldstream;
11940                         /* Turn off the bit */
11941                         x = add_stream & 0xfe;
11942                         add_stream = x;
11943                         goto skip_stuff;
11944                 }
11945                 /*
11946                  * Ok now we proceed with copying the old out stuff and
11947                  * initializing the new stuff.
11948                  */
11949                 SCTP_TCB_SEND_LOCK(stcb);
11950                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11951                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11952                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11953                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11954                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11955                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11956                         stcb->asoc.strmout[i].stream_no = i;
11957                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11958                         /* now anything on those queues? */
11959                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11960                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11961                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11962                         }
11963                         /* Now move assoc pointers too */
11964                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11965                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11966                         }
11967                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11968                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11969                         }
11970                 }
11971                 /* now the new streams */
11972                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11973                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11974                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11975                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11976                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11977                         stcb->asoc.strmout[i].stream_no = i;
11978                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11979                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11980                 }
11981                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11982                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11983                 SCTP_TCB_SEND_UNLOCK(stcb);
11984         }
11985 skip_stuff:
11986         if ((add_stream & 1) && (adding_o > 0)) {
11987                 asoc->strm_pending_add_size = adding_o;
11988                 asoc->peer_req_out = peer_asked;
11989                 sctp_add_an_out_stream(chk, seq, adding_o);
11990                 seq++;
11991                 asoc->stream_reset_outstanding++;
11992         }
11993         if ((add_stream & 2) && (adding_i > 0)) {
11994                 sctp_add_an_in_stream(chk, seq, adding_i);
11995                 seq++;
11996                 asoc->stream_reset_outstanding++;
11997         }
11998         if (send_in_req) {
11999                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12000                 seq++;
12001                 asoc->stream_reset_outstanding++;
12002         }
12003         if (send_tsn_req) {
12004                 sctp_add_stream_reset_tsn(chk, seq);
12005                 asoc->stream_reset_outstanding++;
12006         }
12007         asoc->str_reset = chk;
12008         /* insert the chunk for sending */
12009         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12010             chk,
12011             sctp_next);
12012         asoc->ctrl_queue_cnt++;
12013         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12014         return (0);
12015 }
12016
12017 void
12018 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12019     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12020     uint8_t use_mflowid, uint32_t mflowid,
12021     uint32_t vrf_id, uint16_t port)
12022 {
12023         /* Don't respond to an ABORT with an ABORT. */
12024         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12025                 if (cause)
12026                         sctp_m_freem(cause);
12027                 return;
12028         }
12029         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12030             use_mflowid, mflowid,
12031             vrf_id, port);
12032         return;
12033 }
12034
12035 void
12036 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12037     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12038     uint8_t use_mflowid, uint32_t mflowid,
12039     uint32_t vrf_id, uint16_t port)
12040 {
12041         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12042             use_mflowid, mflowid,
12043             vrf_id, port);
12044         return;
12045 }
12046
12047 static struct mbuf *
12048 sctp_copy_resume(struct uio *uio,
12049     int max_send_len,
12050     int user_marks_eor,
12051     int *error,
12052     uint32_t * sndout,
12053     struct mbuf **new_tail)
12054 {
12055         struct mbuf *m;
12056
12057         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12058             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12059         if (m == NULL) {
12060                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12061                 *error = ENOMEM;
12062         } else {
12063                 *sndout = m_length(m, NULL);
12064                 *new_tail = m_last(m);
12065         }
12066         return (m);
12067 }
12068
12069 static int
12070 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12071     struct uio *uio,
12072     int resv_upfront)
12073 {
12074         int left;
12075
12076         left = sp->length;
12077         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12078             resv_upfront, 0);
12079         if (sp->data == NULL) {
12080                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12081                 return (ENOMEM);
12082         }
12083         sp->tail_mbuf = m_last(sp->data);
12084         return (0);
12085 }
12086
12087
12088
12089 static struct sctp_stream_queue_pending *
12090 sctp_copy_it_in(struct sctp_tcb *stcb,
12091     struct sctp_association *asoc,
12092     struct sctp_sndrcvinfo *srcv,
12093     struct uio *uio,
12094     struct sctp_nets *net,
12095     int max_send_len,
12096     int user_marks_eor,
12097     int *error)
12098 {
12099         /*-
12100          * This routine must be very careful in its work. Protocol
12101          * processing is up and running so care must be taken to spl...()
12102          * when you need to do something that may effect the stcb/asoc. The
12103          * sb is locked however. When data is copied the protocol processing
12104          * should be enabled since this is a slower operation...
12105          */
12106         struct sctp_stream_queue_pending *sp = NULL;
12107         int resv_in_first;
12108
12109         *error = 0;
12110         /* Now can we send this? */
12111         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12112             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12113             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12114             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12115                 /* got data while shutting down */
12116                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12117                 *error = ECONNRESET;
12118                 goto out_now;
12119         }
12120         sctp_alloc_a_strmoq(stcb, sp);
12121         if (sp == NULL) {
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12123                 *error = ENOMEM;
12124                 goto out_now;
12125         }
12126         sp->act_flags = 0;
12127         sp->sender_all_done = 0;
12128         sp->sinfo_flags = srcv->sinfo_flags;
12129         sp->timetolive = srcv->sinfo_timetolive;
12130         sp->ppid = srcv->sinfo_ppid;
12131         sp->context = srcv->sinfo_context;
12132         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12133
12134         sp->stream = srcv->sinfo_stream;
12135         sp->length = min(uio->uio_resid, max_send_len);
12136         if ((sp->length == (uint32_t) uio->uio_resid) &&
12137             ((user_marks_eor == 0) ||
12138             (srcv->sinfo_flags & SCTP_EOF) ||
12139             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12140                 sp->msg_is_complete = 1;
12141         } else {
12142                 sp->msg_is_complete = 0;
12143         }
12144         sp->sender_all_done = 0;
12145         sp->some_taken = 0;
12146         sp->put_last_out = 0;
12147         resv_in_first = sizeof(struct sctp_data_chunk);
12148         sp->data = sp->tail_mbuf = NULL;
12149         if (sp->length == 0) {
12150                 *error = 0;
12151                 goto skip_copy;
12152         }
12153         if (srcv->sinfo_keynumber_valid) {
12154                 sp->auth_keyid = srcv->sinfo_keynumber;
12155         } else {
12156                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12157         }
12158         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12159                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12160                 sp->holds_key_ref = 1;
12161         }
12162         *error = sctp_copy_one(sp, uio, resv_in_first);
12163 skip_copy:
12164         if (*error) {
12165                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12166                 sp = NULL;
12167         } else {
12168                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12169                         sp->net = net;
12170                         atomic_add_int(&sp->net->ref_count, 1);
12171                 } else {
12172                         sp->net = NULL;
12173                 }
12174                 sctp_set_prsctp_policy(sp);
12175         }
12176 out_now:
12177         return (sp);
12178 }
12179
12180
12181 int
12182 sctp_sosend(struct socket *so,
12183     struct sockaddr *addr,
12184     struct uio *uio,
12185     struct mbuf *top,
12186     struct mbuf *control,
12187     int flags,
12188     struct thread *p
12189 )
12190 {
12191         int error, use_sndinfo = 0;
12192         struct sctp_sndrcvinfo sndrcvninfo;
12193         struct sockaddr *addr_to_use;
12194
12195 #if defined(INET) && defined(INET6)
12196         struct sockaddr_in sin;
12197
12198 #endif
12199
12200         if (control) {
12201                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12202                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12203                     sizeof(sndrcvninfo))) {
12204                         /* got one */
12205                         use_sndinfo = 1;
12206                 }
12207         }
12208         addr_to_use = addr;
12209 #if defined(INET) && defined(INET6)
12210         if ((addr) && (addr->sa_family == AF_INET6)) {
12211                 struct sockaddr_in6 *sin6;
12212
12213                 sin6 = (struct sockaddr_in6 *)addr;
12214                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12215                         in6_sin6_2_sin(&sin, sin6);
12216                         addr_to_use = (struct sockaddr *)&sin;
12217                 }
12218         }
12219 #endif
12220         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12221             control,
12222             flags,
12223             use_sndinfo ? &sndrcvninfo : NULL
12224             ,p
12225             );
12226         return (error);
12227 }
12228
12229
12230 int
12231 sctp_lower_sosend(struct socket *so,
12232     struct sockaddr *addr,
12233     struct uio *uio,
12234     struct mbuf *i_pak,
12235     struct mbuf *control,
12236     int flags,
12237     struct sctp_sndrcvinfo *srcv
12238     ,
12239     struct thread *p
12240 )
12241 {
12242         unsigned int sndlen = 0, max_len;
12243         int error, len;
12244         struct mbuf *top = NULL;
12245         int queue_only = 0, queue_only_for_init = 0;
12246         int free_cnt_applied = 0;
12247         int un_sent;
12248         int now_filled = 0;
12249         unsigned int inqueue_bytes = 0;
12250         struct sctp_block_entry be;
12251         struct sctp_inpcb *inp;
12252         struct sctp_tcb *stcb = NULL;
12253         struct timeval now;
12254         struct sctp_nets *net;
12255         struct sctp_association *asoc;
12256         struct sctp_inpcb *t_inp;
12257         int user_marks_eor;
12258         int create_lock_applied = 0;
12259         int nagle_applies = 0;
12260         int some_on_control = 0;
12261         int got_all_of_the_send = 0;
12262         int hold_tcblock = 0;
12263         int non_blocking = 0;
12264         uint32_t local_add_more, local_soresv = 0;
12265         uint16_t port;
12266         uint16_t sinfo_flags;
12267         sctp_assoc_t sinfo_assoc_id;
12268
12269         error = 0;
12270         net = NULL;
12271         stcb = NULL;
12272         asoc = NULL;
12273
12274         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12275         if (inp == NULL) {
12276                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12277                 error = EINVAL;
12278                 if (i_pak) {
12279                         SCTP_RELEASE_PKT(i_pak);
12280                 }
12281                 return (error);
12282         }
12283         if ((uio == NULL) && (i_pak == NULL)) {
12284                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12285                 return (EINVAL);
12286         }
12287         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12288         atomic_add_int(&inp->total_sends, 1);
12289         if (uio) {
12290                 if (uio->uio_resid < 0) {
12291                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12292                         return (EINVAL);
12293                 }
12294                 sndlen = uio->uio_resid;
12295         } else {
12296                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12297                 sndlen = SCTP_HEADER_LEN(i_pak);
12298         }
12299         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12300             (void *)addr,
12301             sndlen);
12302         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12303             (inp->sctp_socket->so_qlimit)) {
12304                 /* The listener can NOT send */
12305                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12306                 error = ENOTCONN;
12307                 goto out_unlocked;
12308         }
12309         /**
12310          * Pre-screen address, if one is given the sin-len
12311          * must be set correctly!
12312          */
12313         if (addr) {
12314                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12315
12316                 switch (raddr->sa.sa_family) {
12317 #ifdef INET
12318                 case AF_INET:
12319                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12320                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12321                                 error = EINVAL;
12322                                 goto out_unlocked;
12323                         }
12324                         port = raddr->sin.sin_port;
12325                         break;
12326 #endif
12327 #ifdef INET6
12328                 case AF_INET6:
12329                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12330                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12331                                 error = EINVAL;
12332                                 goto out_unlocked;
12333                         }
12334                         port = raddr->sin6.sin6_port;
12335                         break;
12336 #endif
12337                 default:
12338                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12339                         error = EAFNOSUPPORT;
12340                         goto out_unlocked;
12341                 }
12342         } else
12343                 port = 0;
12344
12345         if (srcv) {
12346                 sinfo_flags = srcv->sinfo_flags;
12347                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12348                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12349                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12350                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12351                         error = EINVAL;
12352                         goto out_unlocked;
12353                 }
12354                 if (srcv->sinfo_flags)
12355                         SCTP_STAT_INCR(sctps_sends_with_flags);
12356         } else {
12357                 sinfo_flags = inp->def_send.sinfo_flags;
12358                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12359         }
12360         if (sinfo_flags & SCTP_SENDALL) {
12361                 /* its a sendall */
12362                 error = sctp_sendall(inp, uio, top, srcv);
12363                 top = NULL;
12364                 goto out_unlocked;
12365         }
12366         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12367                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12368                 error = EINVAL;
12369                 goto out_unlocked;
12370         }
12371         /* now we must find the assoc */
12372         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12373             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12374                 SCTP_INP_RLOCK(inp);
12375                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12376                 if (stcb) {
12377                         SCTP_TCB_LOCK(stcb);
12378                         hold_tcblock = 1;
12379                 }
12380                 SCTP_INP_RUNLOCK(inp);
12381         } else if (sinfo_assoc_id) {
12382                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12383         } else if (addr) {
12384                 /*-
12385                  * Since we did not use findep we must
12386                  * increment it, and if we don't find a tcb
12387                  * decrement it.
12388                  */
12389                 SCTP_INP_WLOCK(inp);
12390                 SCTP_INP_INCR_REF(inp);
12391                 SCTP_INP_WUNLOCK(inp);
12392                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12393                 if (stcb == NULL) {
12394                         SCTP_INP_WLOCK(inp);
12395                         SCTP_INP_DECR_REF(inp);
12396                         SCTP_INP_WUNLOCK(inp);
12397                 } else {
12398                         hold_tcblock = 1;
12399                 }
12400         }
12401         if ((stcb == NULL) && (addr)) {
12402                 /* Possible implicit send? */
12403                 SCTP_ASOC_CREATE_LOCK(inp);
12404                 create_lock_applied = 1;
12405                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12406                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12407                         /* Should I really unlock ? */
12408                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12409                         error = EINVAL;
12410                         goto out_unlocked;
12411
12412                 }
12413                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12414                     (addr->sa_family == AF_INET6)) {
12415                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12416                         error = EINVAL;
12417                         goto out_unlocked;
12418                 }
12419                 SCTP_INP_WLOCK(inp);
12420                 SCTP_INP_INCR_REF(inp);
12421                 SCTP_INP_WUNLOCK(inp);
12422                 /* With the lock applied look again */
12423                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12424                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12425                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12426                 }
12427                 if (stcb == NULL) {
12428                         SCTP_INP_WLOCK(inp);
12429                         SCTP_INP_DECR_REF(inp);
12430                         SCTP_INP_WUNLOCK(inp);
12431                 } else {
12432                         hold_tcblock = 1;
12433                 }
12434                 if (error) {
12435                         goto out_unlocked;
12436                 }
12437                 if (t_inp != inp) {
12438                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12439                         error = ENOTCONN;
12440                         goto out_unlocked;
12441                 }
12442         }
12443         if (stcb == NULL) {
12444                 if (addr == NULL) {
12445                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12446                         error = ENOENT;
12447                         goto out_unlocked;
12448                 } else {
12449                         /* We must go ahead and start the INIT process */
12450                         uint32_t vrf_id;
12451
12452                         if ((sinfo_flags & SCTP_ABORT) ||
12453                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12454                                 /*-
12455                                  * User asks to abort a non-existant assoc,
12456                                  * or EOF a non-existant assoc with no data
12457                                  */
12458                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12459                                 error = ENOENT;
12460                                 goto out_unlocked;
12461                         }
12462                         /* get an asoc/stcb struct */
12463                         vrf_id = inp->def_vrf_id;
12464 #ifdef INVARIANTS
12465                         if (create_lock_applied == 0) {
12466                                 panic("Error, should hold create lock and I don't?");
12467                         }
12468 #endif
12469                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12470                             p
12471                             );
12472                         if (stcb == NULL) {
12473                                 /* Error is setup for us in the call */
12474                                 goto out_unlocked;
12475                         }
12476                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12477                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12478                                 /*
12479                                  * Set the connected flag so we can queue
12480                                  * data
12481                                  */
12482                                 soisconnecting(so);
12483                         }
12484                         hold_tcblock = 1;
12485                         if (create_lock_applied) {
12486                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12487                                 create_lock_applied = 0;
12488                         } else {
12489                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12490                         }
12491                         /*
12492                          * Turn on queue only flag to prevent data from
12493                          * being sent
12494                          */
12495                         queue_only = 1;
12496                         asoc = &stcb->asoc;
12497                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12498                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12499
12500                         /* initialize authentication params for the assoc */
12501                         sctp_initialize_auth_params(inp, stcb);
12502
12503                         if (control) {
12504                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12505                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12506                                         hold_tcblock = 0;
12507                                         stcb = NULL;
12508                                         goto out_unlocked;
12509                                 }
12510                         }
12511                         /* out with the INIT */
12512                         queue_only_for_init = 1;
12513                         /*-
12514                          * we may want to dig in after this call and adjust the MTU
12515                          * value. It defaulted to 1500 (constant) but the ro
12516                          * structure may now have an update and thus we may need to
12517                          * change it BEFORE we append the message.
12518                          */
12519                 }
12520         } else
12521                 asoc = &stcb->asoc;
12522         if (srcv == NULL)
12523                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12524         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12525                 if (addr)
12526                         net = sctp_findnet(stcb, addr);
12527                 else
12528                         net = NULL;
12529                 if ((net == NULL) ||
12530                     ((port != 0) && (port != stcb->rport))) {
12531                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12532                         error = EINVAL;
12533                         goto out_unlocked;
12534                 }
12535         } else {
12536                 if (stcb->asoc.alternate) {
12537                         net = stcb->asoc.alternate;
12538                 } else {
12539                         net = stcb->asoc.primary_destination;
12540                 }
12541         }
12542         atomic_add_int(&stcb->total_sends, 1);
12543         /* Keep the stcb from being freed under our feet */
12544         atomic_add_int(&asoc->refcnt, 1);
12545         free_cnt_applied = 1;
12546
12547         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12548                 if (sndlen > asoc->smallest_mtu) {
12549                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12550                         error = EMSGSIZE;
12551                         goto out_unlocked;
12552                 }
12553         }
12554         if (SCTP_SO_IS_NBIO(so)
12555             || (flags & MSG_NBIO)
12556             ) {
12557                 non_blocking = 1;
12558         }
12559         /* would we block? */
12560         if (non_blocking) {
12561                 if (hold_tcblock == 0) {
12562                         SCTP_TCB_LOCK(stcb);
12563                         hold_tcblock = 1;
12564                 }
12565                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12566                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12567                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12568                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12569                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12570                                 error = EMSGSIZE;
12571                         else
12572                                 error = EWOULDBLOCK;
12573                         goto out_unlocked;
12574                 }
12575                 stcb->asoc.sb_send_resv += sndlen;
12576                 SCTP_TCB_UNLOCK(stcb);
12577                 hold_tcblock = 0;
12578         } else {
12579                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12580         }
12581         local_soresv = sndlen;
12582         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12583                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12584                 error = ECONNRESET;
12585                 goto out_unlocked;
12586         }
12587         if (create_lock_applied) {
12588                 SCTP_ASOC_CREATE_UNLOCK(inp);
12589                 create_lock_applied = 0;
12590         }
12591         if (asoc->stream_reset_outstanding) {
12592                 /*
12593                  * Can't queue any data while stream reset is underway.
12594                  */
12595                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12596                 error = EAGAIN;
12597                 goto out_unlocked;
12598         }
12599         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12600             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12601                 queue_only = 1;
12602         }
12603         /* we are now done with all control */
12604         if (control) {
12605                 sctp_m_freem(control);
12606                 control = NULL;
12607         }
12608         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12609             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12610             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12611             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12612                 if (srcv->sinfo_flags & SCTP_ABORT) {
12613                         ;
12614                 } else {
12615                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12616                         error = ECONNRESET;
12617                         goto out_unlocked;
12618                 }
12619         }
12620         /* Ok, we will attempt a msgsnd :> */
12621         if (p) {
12622                 p->td_ru.ru_msgsnd++;
12623         }
12624         /* Are we aborting? */
12625         if (srcv->sinfo_flags & SCTP_ABORT) {
12626                 struct mbuf *mm;
12627                 int tot_demand, tot_out = 0, max_out;
12628
12629                 SCTP_STAT_INCR(sctps_sends_with_abort);
12630                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12631                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12632                         /* It has to be up before we abort */
12633                         /* how big is the user initiated abort? */
12634                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12635                         error = EINVAL;
12636                         goto out;
12637                 }
12638                 if (hold_tcblock) {
12639                         SCTP_TCB_UNLOCK(stcb);
12640                         hold_tcblock = 0;
12641                 }
12642                 if (top) {
12643                         struct mbuf *cntm = NULL;
12644
12645                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12646                         if (sndlen != 0) {
12647                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12648                                         tot_out += SCTP_BUF_LEN(cntm);
12649                                 }
12650                         }
12651                 } else {
12652                         /* Must fit in a MTU */
12653                         tot_out = sndlen;
12654                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12655                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12656                                 /* To big */
12657                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12658                                 error = EMSGSIZE;
12659                                 goto out;
12660                         }
12661                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12662                 }
12663                 if (mm == NULL) {
12664                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12665                         error = ENOMEM;
12666                         goto out;
12667                 }
12668                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12669                 max_out -= sizeof(struct sctp_abort_msg);
12670                 if (tot_out > max_out) {
12671                         tot_out = max_out;
12672                 }
12673                 if (mm) {
12674                         struct sctp_paramhdr *ph;
12675
12676                         /* now move forward the data pointer */
12677                         ph = mtod(mm, struct sctp_paramhdr *);
12678                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12679                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12680                         ph++;
12681                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12682                         if (top == NULL) {
12683                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12684                                 if (error) {
12685                                         /*-
12686                                          * Here if we can't get his data we
12687                                          * still abort we just don't get to
12688                                          * send the users note :-0
12689                                          */
12690                                         sctp_m_freem(mm);
12691                                         mm = NULL;
12692                                 }
12693                         } else {
12694                                 if (sndlen != 0) {
12695                                         SCTP_BUF_NEXT(mm) = top;
12696                                 }
12697                         }
12698                 }
12699                 if (hold_tcblock == 0) {
12700                         SCTP_TCB_LOCK(stcb);
12701                 }
12702                 atomic_add_int(&stcb->asoc.refcnt, -1);
12703                 free_cnt_applied = 0;
12704                 /* release this lock, otherwise we hang on ourselves */
12705                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12706                 /* now relock the stcb so everything is sane */
12707                 hold_tcblock = 0;
12708                 stcb = NULL;
12709                 /*
12710                  * In this case top is already chained to mm avoid double
12711                  * free, since we free it below if top != NULL and driver
12712                  * would free it after sending the packet out
12713                  */
12714                 if (sndlen != 0) {
12715                         top = NULL;
12716                 }
12717                 goto out_unlocked;
12718         }
12719         /* Calculate the maximum we can send */
12720         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12721         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12722                 if (non_blocking) {
12723                         /* we already checked for non-blocking above. */
12724                         max_len = sndlen;
12725                 } else {
12726                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12727                 }
12728         } else {
12729                 max_len = 0;
12730         }
12731         if (hold_tcblock) {
12732                 SCTP_TCB_UNLOCK(stcb);
12733                 hold_tcblock = 0;
12734         }
12735         /* Is the stream no. valid? */
12736         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12737                 /* Invalid stream number */
12738                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12739                 error = EINVAL;
12740                 goto out_unlocked;
12741         }
12742         if (asoc->strmout == NULL) {
12743                 /* huh? software error */
12744                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12745                 error = EFAULT;
12746                 goto out_unlocked;
12747         }
12748         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12749         if ((user_marks_eor == 0) &&
12750             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12751                 /* It will NEVER fit */
12752                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12753                 error = EMSGSIZE;
12754                 goto out_unlocked;
12755         }
12756         if ((uio == NULL) && user_marks_eor) {
12757                 /*-
12758                  * We do not support eeor mode for
12759                  * sending with mbuf chains (like sendfile).
12760                  */
12761                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12762                 error = EINVAL;
12763                 goto out_unlocked;
12764         }
12765         if (user_marks_eor) {
12766                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12767         } else {
12768                 /*-
12769                  * For non-eeor the whole message must fit in
12770                  * the socket send buffer.
12771                  */
12772                 local_add_more = sndlen;
12773         }
12774         len = 0;
12775         if (non_blocking) {
12776                 goto skip_preblock;
12777         }
12778         if (((max_len <= local_add_more) &&
12779             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12780             (max_len == 0) ||
12781             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12782                 /* No room right now ! */
12783                 SOCKBUF_LOCK(&so->so_snd);
12784                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12785                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12786                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12787                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12788                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12789                             inqueue_bytes,
12790                             local_add_more,
12791                             stcb->asoc.stream_queue_cnt,
12792                             stcb->asoc.chunks_on_out_queue,
12793                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12794                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12795                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12796                         }
12797                         be.error = 0;
12798                         stcb->block_entry = &be;
12799                         error = sbwait(&so->so_snd);
12800                         stcb->block_entry = NULL;
12801                         if (error || so->so_error || be.error) {
12802                                 if (error == 0) {
12803                                         if (so->so_error)
12804                                                 error = so->so_error;
12805                                         if (be.error) {
12806                                                 error = be.error;
12807                                         }
12808                                 }
12809                                 SOCKBUF_UNLOCK(&so->so_snd);
12810                                 goto out_unlocked;
12811                         }
12812                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12813                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12814                                     asoc, stcb->asoc.total_output_queue_size);
12815                         }
12816                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12817                                 goto out_unlocked;
12818                         }
12819                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12820                 }
12821                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12822                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12823                 } else {
12824                         max_len = 0;
12825                 }
12826                 SOCKBUF_UNLOCK(&so->so_snd);
12827         }
12828 skip_preblock:
12829         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12830                 goto out_unlocked;
12831         }
12832         /*
12833          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12834          * case NOTE: uio will be null when top/mbuf is passed
12835          */
12836         if (sndlen == 0) {
12837                 if (srcv->sinfo_flags & SCTP_EOF) {
12838                         got_all_of_the_send = 1;
12839                         goto dataless_eof;
12840                 } else {
12841                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12842                         error = EINVAL;
12843                         goto out;
12844                 }
12845         }
12846         if (top == NULL) {
12847                 struct sctp_stream_queue_pending *sp;
12848                 struct sctp_stream_out *strm;
12849                 uint32_t sndout;
12850
12851                 SCTP_TCB_SEND_LOCK(stcb);
12852                 if ((asoc->stream_locked) &&
12853                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12854                         SCTP_TCB_SEND_UNLOCK(stcb);
12855                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12856                         error = EINVAL;
12857                         goto out;
12858                 }
12859                 SCTP_TCB_SEND_UNLOCK(stcb);
12860
12861                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12862                 if (strm->last_msg_incomplete == 0) {
12863         do_a_copy_in:
12864                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12865                         if ((sp == NULL) || (error)) {
12866                                 goto out;
12867                         }
12868                         SCTP_TCB_SEND_LOCK(stcb);
12869                         if (sp->msg_is_complete) {
12870                                 strm->last_msg_incomplete = 0;
12871                                 asoc->stream_locked = 0;
12872                         } else {
12873                                 /*
12874                                  * Just got locked to this guy in case of an
12875                                  * interrupt.
12876                                  */
12877                                 strm->last_msg_incomplete = 1;
12878                                 asoc->stream_locked = 1;
12879                                 asoc->stream_locked_on = srcv->sinfo_stream;
12880                                 sp->sender_all_done = 0;
12881                         }
12882                         sctp_snd_sb_alloc(stcb, sp->length);
12883                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12884                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12885                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12886                         }
12887                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12888                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12889                         SCTP_TCB_SEND_UNLOCK(stcb);
12890                 } else {
12891                         SCTP_TCB_SEND_LOCK(stcb);
12892                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12893                         SCTP_TCB_SEND_UNLOCK(stcb);
12894                         if (sp == NULL) {
12895                                 /* ???? Huh ??? last msg is gone */
12896 #ifdef INVARIANTS
12897                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12898 #else
12899                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12900                                 strm->last_msg_incomplete = 0;
12901 #endif
12902                                 goto do_a_copy_in;
12903
12904                         }
12905                 }
12906                 while (uio->uio_resid > 0) {
12907                         /* How much room do we have? */
12908                         struct mbuf *new_tail, *mm;
12909
12910                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12911                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12912                         else
12913                                 max_len = 0;
12914
12915                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12916                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12917                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12918                                 sndout = 0;
12919                                 new_tail = NULL;
12920                                 if (hold_tcblock) {
12921                                         SCTP_TCB_UNLOCK(stcb);
12922                                         hold_tcblock = 0;
12923                                 }
12924                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12925                                 if ((mm == NULL) || error) {
12926                                         if (mm) {
12927                                                 sctp_m_freem(mm);
12928                                         }
12929                                         goto out;
12930                                 }
12931                                 /* Update the mbuf and count */
12932                                 SCTP_TCB_SEND_LOCK(stcb);
12933                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12934                                         /*
12935                                          * we need to get out. Peer probably
12936                                          * aborted.
12937                                          */
12938                                         sctp_m_freem(mm);
12939                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12940                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12941                                                 error = ECONNRESET;
12942                                         }
12943                                         SCTP_TCB_SEND_UNLOCK(stcb);
12944                                         goto out;
12945                                 }
12946                                 if (sp->tail_mbuf) {
12947                                         /* tack it to the end */
12948                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12949                                         sp->tail_mbuf = new_tail;
12950                                 } else {
12951                                         /* A stolen mbuf */
12952                                         sp->data = mm;
12953                                         sp->tail_mbuf = new_tail;
12954                                 }
12955                                 sctp_snd_sb_alloc(stcb, sndout);
12956                                 atomic_add_int(&sp->length, sndout);
12957                                 len += sndout;
12958
12959                                 /* Did we reach EOR? */
12960                                 if ((uio->uio_resid == 0) &&
12961                                     ((user_marks_eor == 0) ||
12962                                     (srcv->sinfo_flags & SCTP_EOF) ||
12963                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12964                                         sp->msg_is_complete = 1;
12965                                 } else {
12966                                         sp->msg_is_complete = 0;
12967                                 }
12968                                 SCTP_TCB_SEND_UNLOCK(stcb);
12969                         }
12970                         if (uio->uio_resid == 0) {
12971                                 /* got it all? */
12972                                 continue;
12973                         }
12974                         /* PR-SCTP? */
12975                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12976                                 /*
12977                                  * This is ugly but we must assure locking
12978                                  * order
12979                                  */
12980                                 if (hold_tcblock == 0) {
12981                                         SCTP_TCB_LOCK(stcb);
12982                                         hold_tcblock = 1;
12983                                 }
12984                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12985                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12986                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12987                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12988                                 else
12989                                         max_len = 0;
12990                                 if (max_len > 0) {
12991                                         continue;
12992                                 }
12993                                 SCTP_TCB_UNLOCK(stcb);
12994                                 hold_tcblock = 0;
12995                         }
12996                         /* wait for space now */
12997                         if (non_blocking) {
12998                                 /* Non-blocking io in place out */
12999                                 goto skip_out_eof;
13000                         }
13001                         /* What about the INIT, send it maybe */
13002                         if (queue_only_for_init) {
13003                                 if (hold_tcblock == 0) {
13004                                         SCTP_TCB_LOCK(stcb);
13005                                         hold_tcblock = 1;
13006                                 }
13007                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13008                                         /* a collision took us forward? */
13009                                         queue_only = 0;
13010                                 } else {
13011                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13012                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13013                                         queue_only = 1;
13014                                 }
13015                         }
13016                         if ((net->flight_size > net->cwnd) &&
13017                             (asoc->sctp_cmt_on_off == 0)) {
13018                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13019                                 queue_only = 1;
13020                         } else if (asoc->ifp_had_enobuf) {
13021                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13022                                 if (net->flight_size > (2 * net->mtu)) {
13023                                         queue_only = 1;
13024                                 }
13025                                 asoc->ifp_had_enobuf = 0;
13026                         }
13027                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13028                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13029                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13030                             (stcb->asoc.total_flight > 0) &&
13031                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13032                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13033
13034                                 /*-
13035                                  * Ok, Nagle is set on and we have data outstanding.
13036                                  * Don't send anything and let SACKs drive out the
13037                                  * data unless wen have a "full" segment to send.
13038                                  */
13039                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13040                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13041                                 }
13042                                 SCTP_STAT_INCR(sctps_naglequeued);
13043                                 nagle_applies = 1;
13044                         } else {
13045                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13046                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13047                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13048                                 }
13049                                 SCTP_STAT_INCR(sctps_naglesent);
13050                                 nagle_applies = 0;
13051                         }
13052                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13053
13054                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13055                                     nagle_applies, un_sent);
13056                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13057                                     stcb->asoc.total_flight,
13058                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13059                         }
13060                         if (queue_only_for_init)
13061                                 queue_only_for_init = 0;
13062                         if ((queue_only == 0) && (nagle_applies == 0)) {
13063                                 /*-
13064                                  * need to start chunk output
13065                                  * before blocking.. note that if
13066                                  * a lock is already applied, then
13067                                  * the input via the net is happening
13068                                  * and I don't need to start output :-D
13069                                  */
13070                                 if (hold_tcblock == 0) {
13071                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13072                                                 hold_tcblock = 1;
13073                                                 sctp_chunk_output(inp,
13074                                                     stcb,
13075                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13076                                         }
13077                                 } else {
13078                                         sctp_chunk_output(inp,
13079                                             stcb,
13080                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13081                                 }
13082                                 if (hold_tcblock == 1) {
13083                                         SCTP_TCB_UNLOCK(stcb);
13084                                         hold_tcblock = 0;
13085                                 }
13086                         }
13087                         SOCKBUF_LOCK(&so->so_snd);
13088                         /*-
13089                          * This is a bit strange, but I think it will
13090                          * work. The total_output_queue_size is locked and
13091                          * protected by the TCB_LOCK, which we just released.
13092                          * There is a race that can occur between releasing it
13093                          * above, and me getting the socket lock, where sacks
13094                          * come in but we have not put the SB_WAIT on the
13095                          * so_snd buffer to get the wakeup. After the LOCK
13096                          * is applied the sack_processing will also need to
13097                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13098                          * once we have the socket buffer lock if we recheck the
13099                          * size we KNOW we will get to sleep safely with the
13100                          * wakeup flag in place.
13101                          */
13102                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13103                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13104                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13105                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13106                                             asoc, uio->uio_resid);
13107                                 }
13108                                 be.error = 0;
13109                                 stcb->block_entry = &be;
13110                                 error = sbwait(&so->so_snd);
13111                                 stcb->block_entry = NULL;
13112
13113                                 if (error || so->so_error || be.error) {
13114                                         if (error == 0) {
13115                                                 if (so->so_error)
13116                                                         error = so->so_error;
13117                                                 if (be.error) {
13118                                                         error = be.error;
13119                                                 }
13120                                         }
13121                                         SOCKBUF_UNLOCK(&so->so_snd);
13122                                         goto out_unlocked;
13123                                 }
13124                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13125                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13126                                             asoc, stcb->asoc.total_output_queue_size);
13127                                 }
13128                         }
13129                         SOCKBUF_UNLOCK(&so->so_snd);
13130                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13131                                 goto out_unlocked;
13132                         }
13133                 }
13134                 SCTP_TCB_SEND_LOCK(stcb);
13135                 if (sp) {
13136                         if (sp->msg_is_complete == 0) {
13137                                 strm->last_msg_incomplete = 1;
13138                                 asoc->stream_locked = 1;
13139                                 asoc->stream_locked_on = srcv->sinfo_stream;
13140                         } else {
13141                                 sp->sender_all_done = 1;
13142                                 strm->last_msg_incomplete = 0;
13143                                 asoc->stream_locked = 0;
13144                         }
13145                 } else {
13146                         SCTP_PRINTF("Huh no sp TSNH?\n");
13147                         strm->last_msg_incomplete = 0;
13148                         asoc->stream_locked = 0;
13149                 }
13150                 SCTP_TCB_SEND_UNLOCK(stcb);
13151                 if (uio->uio_resid == 0) {
13152                         got_all_of_the_send = 1;
13153                 }
13154         } else {
13155                 /* We send in a 0, since we do NOT have any locks */
13156                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13157                 top = NULL;
13158                 if (srcv->sinfo_flags & SCTP_EOF) {
13159                         /*
13160                          * This should only happen for Panda for the mbuf
13161                          * send case, which does NOT yet support EEOR mode.
13162                          * Thus, we can just set this flag to do the proper
13163                          * EOF handling.
13164                          */
13165                         got_all_of_the_send = 1;
13166                 }
13167         }
13168         if (error) {
13169                 goto out;
13170         }
13171 dataless_eof:
13172         /* EOF thing ? */
13173         if ((srcv->sinfo_flags & SCTP_EOF) &&
13174             (got_all_of_the_send == 1)) {
13175                 int cnt;
13176
13177                 SCTP_STAT_INCR(sctps_sends_with_eof);
13178                 error = 0;
13179                 if (hold_tcblock == 0) {
13180                         SCTP_TCB_LOCK(stcb);
13181                         hold_tcblock = 1;
13182                 }
13183                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13184                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13185                     TAILQ_EMPTY(&asoc->sent_queue) &&
13186                     (cnt == 0)) {
13187                         if (asoc->locked_on_sending) {
13188                                 goto abort_anyway;
13189                         }
13190                         /* there is nothing queued to send, so I'm done... */
13191                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13192                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13193                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13194                                 struct sctp_nets *netp;
13195
13196                                 /* only send SHUTDOWN the first time through */
13197                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13198                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13199                                 }
13200                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13201                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13202                                 sctp_stop_timers_for_shutdown(stcb);
13203                                 if (stcb->asoc.alternate) {
13204                                         netp = stcb->asoc.alternate;
13205                                 } else {
13206                                         netp = stcb->asoc.primary_destination;
13207                                 }
13208                                 sctp_send_shutdown(stcb, netp);
13209                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13210                                     netp);
13211                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13212                                     asoc->primary_destination);
13213                         }
13214                 } else {
13215                         /*-
13216                          * we still got (or just got) data to send, so set
13217                          * SHUTDOWN_PENDING
13218                          */
13219                         /*-
13220                          * XXX sockets draft says that SCTP_EOF should be
13221                          * sent with no data.  currently, we will allow user
13222                          * data to be sent first and move to
13223                          * SHUTDOWN-PENDING
13224                          */
13225                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13226                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13227                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13228                                 if (hold_tcblock == 0) {
13229                                         SCTP_TCB_LOCK(stcb);
13230                                         hold_tcblock = 1;
13231                                 }
13232                                 if (asoc->locked_on_sending) {
13233                                         /* Locked to send out the data */
13234                                         struct sctp_stream_queue_pending *sp;
13235
13236                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13237                                         if (sp) {
13238                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13239                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13240                                         }
13241                                 }
13242                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13243                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13244                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13245                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13246                         abort_anyway:
13247                                         if (free_cnt_applied) {
13248                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13249                                                 free_cnt_applied = 0;
13250                                         }
13251                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13252                                             NULL, SCTP_SO_LOCKED);
13253                                         /*
13254                                          * now relock the stcb so everything
13255                                          * is sane
13256                                          */
13257                                         hold_tcblock = 0;
13258                                         stcb = NULL;
13259                                         goto out;
13260                                 }
13261                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13262                                     asoc->primary_destination);
13263                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13264                         }
13265                 }
13266         }
13267 skip_out_eof:
13268         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13269                 some_on_control = 1;
13270         }
13271         if (queue_only_for_init) {
13272                 if (hold_tcblock == 0) {
13273                         SCTP_TCB_LOCK(stcb);
13274                         hold_tcblock = 1;
13275                 }
13276                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13277                         /* a collision took us forward? */
13278                         queue_only = 0;
13279                 } else {
13280                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13281                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13282                         queue_only = 1;
13283                 }
13284         }
13285         if ((net->flight_size > net->cwnd) &&
13286             (stcb->asoc.sctp_cmt_on_off == 0)) {
13287                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13288                 queue_only = 1;
13289         } else if (asoc->ifp_had_enobuf) {
13290                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13291                 if (net->flight_size > (2 * net->mtu)) {
13292                         queue_only = 1;
13293                 }
13294                 asoc->ifp_had_enobuf = 0;
13295         }
13296         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13297             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13298         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13299             (stcb->asoc.total_flight > 0) &&
13300             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13301             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13302                 /*-
13303                  * Ok, Nagle is set on and we have data outstanding.
13304                  * Don't send anything and let SACKs drive out the
13305                  * data unless wen have a "full" segment to send.
13306                  */
13307                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13308                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13309                 }
13310                 SCTP_STAT_INCR(sctps_naglequeued);
13311                 nagle_applies = 1;
13312         } else {
13313                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13314                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13315                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13316                 }
13317                 SCTP_STAT_INCR(sctps_naglesent);
13318                 nagle_applies = 0;
13319         }
13320         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13321                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13322                     nagle_applies, un_sent);
13323                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13324                     stcb->asoc.total_flight,
13325                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13326         }
13327         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13328                 /* we can attempt to send too. */
13329                 if (hold_tcblock == 0) {
13330                         /*
13331                          * If there is activity recv'ing sacks no need to
13332                          * send
13333                          */
13334                         if (SCTP_TCB_TRYLOCK(stcb)) {
13335                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13336                                 hold_tcblock = 1;
13337                         }
13338                 } else {
13339                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13340                 }
13341         } else if ((queue_only == 0) &&
13342                     (stcb->asoc.peers_rwnd == 0) &&
13343             (stcb->asoc.total_flight == 0)) {
13344                 /* We get to have a probe outstanding */
13345                 if (hold_tcblock == 0) {
13346                         hold_tcblock = 1;
13347                         SCTP_TCB_LOCK(stcb);
13348                 }
13349                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13350         } else if (some_on_control) {
13351                 int num_out, reason, frag_point;
13352
13353                 /* Here we do control only */
13354                 if (hold_tcblock == 0) {
13355                         hold_tcblock = 1;
13356                         SCTP_TCB_LOCK(stcb);
13357                 }
13358                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13359                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13360                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13361         }
13362         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13363             queue_only, stcb->asoc.peers_rwnd, un_sent,
13364             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13365             stcb->asoc.total_output_queue_size, error);
13366
13367 out:
13368 out_unlocked:
13369
13370         if (local_soresv && stcb) {
13371                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13372         }
13373         if (create_lock_applied) {
13374                 SCTP_ASOC_CREATE_UNLOCK(inp);
13375         }
13376         if ((stcb) && hold_tcblock) {
13377                 SCTP_TCB_UNLOCK(stcb);
13378         }
13379         if (stcb && free_cnt_applied) {
13380                 atomic_add_int(&stcb->asoc.refcnt, -1);
13381         }
13382 #ifdef INVARIANTS
13383         if (stcb) {
13384                 if (mtx_owned(&stcb->tcb_mtx)) {
13385                         panic("Leaving with tcb mtx owned?");
13386                 }
13387                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13388                         panic("Leaving with tcb send mtx owned?");
13389                 }
13390         }
13391 #endif
13392 #ifdef INVARIANTS
13393         if (inp) {
13394                 sctp_validate_no_locks(inp);
13395         } else {
13396                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13397         }
13398 #endif
13399         if (top) {
13400                 sctp_m_freem(top);
13401         }
13402         if (control) {
13403                 sctp_m_freem(control);
13404         }
13405         return (error);
13406 }
13407
13408
13409 /*
13410  * generate an AUTHentication chunk, if required
13411  */
13412 struct mbuf *
13413 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13414     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13415     struct sctp_tcb *stcb, uint8_t chunk)
13416 {
13417         struct mbuf *m_auth;
13418         struct sctp_auth_chunk *auth;
13419         int chunk_len;
13420         struct mbuf *cn;
13421
13422         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13423             (stcb == NULL))
13424                 return (m);
13425
13426         /* sysctl disabled auth? */
13427         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13428                 return (m);
13429
13430         /* peer doesn't do auth... */
13431         if (!stcb->asoc.peer_supports_auth) {
13432                 return (m);
13433         }
13434         /* does the requested chunk require auth? */
13435         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13436                 return (m);
13437         }
13438         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13439         if (m_auth == NULL) {
13440                 /* no mbuf's */
13441                 return (m);
13442         }
13443         /* reserve some space if this will be the first mbuf */
13444         if (m == NULL)
13445                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13446         /* fill in the AUTH chunk details */
13447         auth = mtod(m_auth, struct sctp_auth_chunk *);
13448         bzero(auth, sizeof(*auth));
13449         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13450         auth->ch.chunk_flags = 0;
13451         chunk_len = sizeof(*auth) +
13452             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13453         auth->ch.chunk_length = htons(chunk_len);
13454         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13455         /* key id and hmac digest will be computed and filled in upon send */
13456
13457         /* save the offset where the auth was inserted into the chain */
13458         *offset = 0;
13459         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13460                 *offset += SCTP_BUF_LEN(cn);
13461         }
13462
13463         /* update length and return pointer to the auth chunk */
13464         SCTP_BUF_LEN(m_auth) = chunk_len;
13465         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13466         if (auth_ret != NULL)
13467                 *auth_ret = auth;
13468
13469         return (m);
13470 }
13471
13472 #ifdef INET6
13473 int
13474 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13475 {
13476         struct nd_prefix *pfx = NULL;
13477         struct nd_pfxrouter *pfxrtr = NULL;
13478         struct sockaddr_in6 gw6;
13479
13480         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13481                 return (0);
13482
13483         /* get prefix entry of address */
13484         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13485                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13486                         continue;
13487                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13488                     &src6->sin6_addr, &pfx->ndpr_mask))
13489                         break;
13490         }
13491         /* no prefix entry in the prefix list */
13492         if (pfx == NULL) {
13493                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13494                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13495                 return (0);
13496         }
13497         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13498         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13499
13500         /* search installed gateway from prefix entry */
13501         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13502                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13503                 gw6.sin6_family = AF_INET6;
13504                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13505                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13506                     sizeof(struct in6_addr));
13507                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13508                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13509                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13510                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13511                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13512                     ro->ro_rt->rt_gateway)) {
13513                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13514                         return (1);
13515                 }
13516         }
13517         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13518         return (0);
13519 }
13520
13521 #endif
13522
13523 int
13524 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13525 {
13526 #ifdef INET
13527         struct sockaddr_in *sin, *mask;
13528         struct ifaddr *ifa;
13529         struct in_addr srcnetaddr, gwnetaddr;
13530
13531         if (ro == NULL || ro->ro_rt == NULL ||
13532             sifa->address.sa.sa_family != AF_INET) {
13533                 return (0);
13534         }
13535         ifa = (struct ifaddr *)sifa->ifa;
13536         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13537         sin = (struct sockaddr_in *)&sifa->address.sin;
13538         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13539         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13540         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13541         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13542
13543         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13544         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13545         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13546         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13547         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13548         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13549                 return (1);
13550         }
13551 #endif
13552         return (0);
13553 }